CN111756495A

CN111756495A - HARQ feedback control method and related equipment

Info

Publication number: CN111756495A
Application number: CN201910247580.7A
Authority: CN
Inventors: 王君; 彭文杰; 戴明增
Original assignee: Huawei Technologies Co Ltd
Current assignee: Beijing Jingshi Intellectual Property Management Co ltd
Priority date: 2019-03-28
Filing date: 2019-03-28
Publication date: 2020-10-09
Anticipated expiration: 2039-03-28
Also published as: CN111756495B; WO2020192778A1

Abstract

The application discloses a HARQ feedback control method and related equipment, wherein the method comprises the following steps: the first terminal equipment acquires the first HARQ configuration information. The first terminal device sends first HARQ configuration information to the second terminal device, the second terminal device receives the first HARQ configuration information, and the first HARQ configuration information comprises first indication information indicating whether the second terminal device carries out HARQ feedback aiming at SL data. If the first indication information indicates that the second terminal equipment performs HARQ feedback for the SL data, the second terminal equipment performs HARQ feedback after receiving the SL data; if the first indication information indicates that the second terminal device does not perform HARQ feedback for the SL data, the second terminal device does not perform HARQ feedback after receiving the SL data. By implementing the embodiment of the application, the SL HARQ feedback can be adaptively enabled or closed, and the system performance is improved.

Description

HARQ feedback control method and related equipment

Technical Field

The present application relates to the field of communications technologies, and in particular, to a HARQ feedback control method and related devices.

Background

In a Long Term Evolution (LTE) system, a hybrid automatic repeat request (HARQ) technology is used by both transceivers to ensure the reliability of data transmission. That is, if the receiving side successfully receives the data, it performs an Acknowledgement (ACK) to the transmitting side, and if the receiving side does not successfully receive the data, it performs a Negative Acknowledgement (NACK) to the transmitting side. The LTE vehicle networking (V2X) does not support HARQ feedback, and a new generation wireless (new radio) V2X adds unicast and multicast types, and how to design a HARQ feedback mechanism to ensure reliability of data transmission is a technical problem that needs to be solved at present.

Disclosure of Invention

The application provides a HARQ feedback control method and related equipment, which can adaptively enable or close SLHARQ feedback and improve system performance.

In a first aspect, an embodiment of the present invention provides a HARQ feedback control method, which is applied to a first terminal device side. In this embodiment of the present invention, the first terminal device may configure an SL HARQ feedback switch for the second terminal device, where the SL HARQ feedback switch is used to characterize whether the second terminal device needs to perform SL HARQ feedback after receiving SL data. The method comprises the following steps: the first terminal equipment acquires the first HARQ configuration information. The first terminal device sends the first HARQ configuration information to the second terminal device, wherein the first HARQ configuration information comprises first indication information indicating whether the second terminal device carries out HARQ feedback aiming at the data of the side link SL. By implementing the embodiment of the invention, the terminal equipment can realize the configuration/application of the self-adaptive SL HARQ switch, so that the SL HARQ feedback is more flexible, and the requirements in various aspects can be met, for example, the load can be reduced by not starting the SL HARQ when the load is high, for example, the transmission efficiency is not influenced by not starting the SL HARQ by the low-delay service, the QoS requirement can be met by aiming at the low-reliability service only through blind retransmission, and the occupation of SL HARQ resources can also be reduced.

In one possible design, the obtaining, by the first terminal device, the first HARQ configuration information may be: the first terminal device generates first HARQ configuration information, that is, the first terminal device configures the SL HARQ feedback switch for the second terminal device. Or, the obtaining, by the first terminal device, the first HARQ configuration information may be: the first terminal device receives first HARQ configuration information sent by the network device, that is, the network device configures the SL HARQ feedback switch for the second terminal device.

In a possible design, if the first indication information indicates that the second terminal device performs HARQ feedback for SL data, an interface for the second terminal device to perform HARQ feedback includes an SL interface or a Uu air interface.

In one possible design, the SL data may include data for one or more traffic types of unicast, multicast, or broadcast.

In one possible design, the SL data includes a transport block TB of a medium access control MAC layer and/or data of a code block group CBG type of a physical layer.

In one possible design, the condition to which the first indication information applies includes: the first terminal device is in a non-scheduling authorization mode, the first terminal device is in a dynamic scheduling mode, the first terminal device is in a semi-persistent scheduling mode, the first terminal device is in an autonomous contention mode, the SL data is data transmitted using a predetermined radio access technology, the SL data is data transmitted using a predetermined carrier, the SL data is data transmitted using a predetermined frequency, the first terminal device is located at a predetermined base station, the first terminal device is located at a predetermined cell, the second terminal device is located at a predetermined base station, the second terminal device is located at a predetermined cell, the first terminal device is a predetermined source terminal, the second terminal device is a predetermined target terminal, the second terminal device is a terminal included in a predetermined group, the SL data is data corresponding to a predetermined service, The SL data is one or more of data satisfying a preset quality of service, the SL data is data transmitted using a preset carrier bandwidth part BWP, the SL data is data transmitted using a preset logical channel group, the SL data is data transmitted using a preset logical channel, the SL data is data transmitted using a preset communication connection, the SL data is data transmitted using a preset group connection, or the SL data is data corresponding to a preset HARQ process.

In a possible design, if the first indication information indicates that the second terminal device performs HARQ feedback for the SL data, the first HARQ configuration information further includes preset condition information, where the preset condition information is used to indicate a condition for performing HARQ feedback for the SL data by the second terminal device.

In one possible design, the preset condition information includes that the preset measurement indicator is above, below, not above, or not below a preset threshold and/or that the preset measurement indicator is or is not in a preset value list.

In one possible design, the measurement object corresponding to the preset measurement index includes one or more of a frequency point/resource pool/BWP required to be measured at the SL, a reference signal required to be measured at the SL, and resource configuration information, where the reference signal includes a synchronization signal block SSB, a channel state information reference signal CSI-RS, a demodulation reference signal DMRS, a phase tracking reference signal PTRS, or a channel sounding reference signal SRS, and the resource configuration information includes any combination of a time domain, a frequency domain, or a space domain.

In one possible design, the conditions to which the measurement object applies include: the first terminal device is in a non-scheduling authorization mode, the first terminal device is in a dynamic scheduling mode, the first terminal device is in a semi-persistent scheduling mode, the first terminal device is in an autonomous contention mode, the SL data is data transmitted using a predetermined radio access technology, the SL data is data transmitted using a predetermined carrier, the SL data is data transmitted using a predetermined frequency, the first terminal device is located at a predetermined base station, the first terminal device is located at a predetermined cell, the second terminal device is located at a predetermined base station, the second terminal device is located at a predetermined cell, the first terminal device is a predetermined source terminal, the second terminal device is a predetermined target terminal, the second terminal device is a terminal included in a predetermined group, the SL data is data corresponding to a predetermined service, The SL data is data satisfying a preset quality of service, the SL data is data transmitted using a preset BWP, the SL data is data transmitted using a preset logical channel group, the SL data is data transmitted using a preset logical channel, the SL data is data transmitted using a preset communication connection, or the SL data is data transmitted using a preset group connection.

In one possible design, the preset measurement indicator includes any one or more combinations of a channel quality corresponding to an SL interface, a quality of service QoS corresponding to an SL interface, or a transmission indicator corresponding to an SL interface, and for example, the channel quality corresponding to an SL interface includes one or more of a channel busy ratio CBR, a reference signal received power RSRP, a reference signal received quality RSRQ, a received signal strength indication RSSI, a channel quality indication CQI, channel state information CSI, a precoding matrix indication PMI in a multiple-input multiple-output MIMO system, a RANK indication RI in a MIMO system, or a RANK of a channel matrix in a MIMO system; the QoS corresponding to the SL interface comprises one or more of a QoS target, a QoS requirement or a QoS value; the sending index corresponding to the SL interface comprises one or more of transmission rate, path loss, a Power Headroom Report (PHR), a Time Advance (TA), a Modulation and Coding Strategy (MCS), power or a block error rate; the QoS value includes latency, reliability, rate, throughput, communication distance, or payload.

In one possible design, before the first terminal device generates the first HARQ configuration information, the method further includes: the first terminal equipment receives second HARQ configuration information sent by network equipment, wherein the second HARQ configuration information comprises second indication information indicating whether the first terminal equipment carries out HARQ feedback aiming at side link SL data; the first terminal device generating the first HARQ configuration information includes: and the first terminal equipment generates the first HARQ configuration information according to the second HARQ configuration information.

In a possible design, if the first indication information indicates that the second terminal device performs HARQ feedback for SL data and the second indication information indicates that the first terminal device performs HARQ feedback for SL data; after the first terminal device sends the first HARQ configuration information to a second terminal device, the method further includes: the first terminal equipment sends SL data to the second terminal equipment; the first terminal equipment receives HARQ feedback information sent by the second terminal equipment through an SL interface; and the first terminal equipment sends HARQ feedback information to the network equipment through a Uu air interface according to the HARQ feedback information sent by the second terminal equipment.

In one possible design, before the obtaining, by the first terminal device, the first HARQ configuration information, the method further includes: the first terminal equipment sends measurement configuration information of a measurement event to the second terminal equipment, wherein the measurement configuration information comprises at least one measurement object and a reporting configuration requirement corresponding to the measurement event; the first terminal device receives a measurement report of the measurement event sent by the second terminal device, where the measurement report is sent by the second terminal device when a first measurement value meets at least one of the reporting configuration requirements, and the first measurement value is obtained by the second terminal device measuring the at least one measurement object; the first terminal device obtains first HARQ configuration information, specifically: and the first terminal equipment generates the first HARQ configuration information according to the measurement report.

In one possible design, the conditions to which the measurement event applies include: the first terminal device is in a non-scheduling authorization mode, the first terminal device is in a dynamic scheduling mode, the first terminal device is in a semi-persistent scheduling mode, the first terminal device is in an autonomous contention mode, the SL data is data transmitted using a predetermined radio access technology, the SL data is data transmitted using a predetermined carrier, the SL data is data transmitted using a predetermined frequency, the first terminal device is located at a predetermined base station, the first terminal device is located at a predetermined cell, the second terminal device is located at a predetermined base station, the second terminal device is located at a predetermined cell, the first terminal device is a predetermined source terminal, the second terminal device is a predetermined target terminal, the second terminal device is a terminal included in a predetermined group, the SL data is data corresponding to a predetermined service, The SL data is one or more of data satisfying a preset quality of service, the SL data is data transmitted using a preset carrier bandwidth part BWP, the SL data is data transmitted using a preset logical channel group, the SL data is data transmitted using a preset logical channel, the SL data is data transmitted using a preset communication connection, and the SL data is data transmitted using a preset group connection.

In one possible design, the number of second terminal devices includes one or more. For example, the number of the second terminal devices is one for a unicast scenario, and the number of the second terminal devices is multiple for a multicast or broadcast scenario.

In one possible design, the sending, by the first terminal device, the first HARQ configuration information to the second terminal device includes: and the first terminal equipment sends the first HARQ configuration information to the second terminal equipment through third communication equipment.

In one possible design, the sending, by the first terminal device, the first HARQ configuration information to the second terminal device includes: the first terminal device sends the first HARQ configuration information to the second terminal device through a first signaling, where the first signaling includes RRC signaling, RLC signaling, PDCP signaling, MAC signaling, SDAP signaling, PC5-S signaling, SIB message, MAC signaling, or physical layer signaling.

In one possible design, after the first terminal device sends the first HARQ configuration information to the second terminal device through a first signaling, the method further includes: and the first terminal equipment sends a second signaling to the second terminal equipment, wherein the second signaling is used for activating the first indication information, and the second signaling comprises SCI signaling or MAC signaling.

In one possible design, the second terminal device is one or more of a device group or a device group.

In one possible design, the granularity for which the first indication information is directed is indicated explicitly or implicitly.

In one possible design, the measurement object is indicated explicitly or implicitly.

In one possible design, the granularity for which the measurement objects are targeted is indicated explicitly or implicitly.

In one possible design, the first terminal device receives change indication information sent by the second terminal device, where the change indication information is used to indicate that the SL HARQ feedback switch of the second terminal device is changed from on to off or from off to on. Optionally, the first terminal device may further send the change indication information to the network device.

In a second aspect, an embodiment of the present invention provides a HARQ feedback control method, which is applied to a second terminal device side. In this embodiment of the present invention, the first terminal device may configure an SL HARQ feedback switch for the second terminal device, where the SL HARQ feedback switch is used to characterize whether the second terminal device needs to perform SL HARQ feedback after receiving SL data. The method comprises the following steps: the second terminal device receives first HARQ configuration information sent by the first terminal device, wherein the first HARQ configuration information comprises first indication information indicating whether the second terminal device carries out HARQ feedback aiming at the data of the side link SL. If the first indication information indicates that the second terminal device performs HARQ feedback for the SL data, the second terminal device needs to perform HARQ feedback after receiving the SL data. If the first indication information indicates that the second terminal device does not perform HARQ feedback for the SL data, the second terminal device does not need to perform HARQ feedback after receiving the SL data. By implementing the embodiment of the invention, the terminal equipment can realize the configuration/application of the self-adaptive SL HARQ switch, so that the SL HARQ feedback is more flexible, and the requirements in various aspects can be met, for example, the load can be reduced by not starting the SL HARQ when the load is high, for example, the transmission efficiency is not influenced by not starting the SL HARQ by the low-delay service, the QoS requirement can be met by aiming at the low-reliability service only through blind retransmission, and the occupation of SL HARQ resources can also be reduced.

In one possible design, the first HARQ configuration information is generated by the first terminal device, or the first HARQ configuration information is received by the first terminal device from a network device.

In a possible design, if the first indication information indicates that the second terminal device performs HARQ feedback for SL data, an interface for the second terminal device to perform HARQ feedback includes an SL interface or a Uu air interface. That is, after receiving the SL data, the RxUE may feed back the HARQ to the Rx UE through the SL interface, or may directly feed back the HARQ to the base station through the Uu interface.

In one possible design, the conditions to which the measurement object applies include: the first terminal device is in a non-scheduling authorization mode, the first terminal device is in a dynamic scheduling mode, the first terminal device is in a semi-persistent scheduling mode, the first terminal device is in an autonomous contention mode, the SL data is data transmitted using a predetermined radio access technology, the SL data is data transmitted using a predetermined carrier, the SL data is data transmitted using a predetermined frequency, the first terminal device is located at a predetermined base station, the first terminal device is located at a predetermined cell, the second terminal device is located at a predetermined base station, the second terminal device is located at a predetermined cell, the first terminal device is a predetermined source terminal, the second terminal device is a predetermined target terminal, the second terminal device is a terminal included in a predetermined group, the SL data is data corresponding to a predetermined service, The SL data is data satisfying a preset quality of service, the SL data is data transmitted using a preset carrier bandwidth part BWP, the SL data is data transmitted using a preset logical channel group, the SL data is data transmitted using a preset logical channel, the SL data is data transmitted using a preset communication connection, or the SL data is data transmitted using a preset group connection.

In one possible design, the preset measurement indicator includes any one or more combinations of a channel quality corresponding to an SL interface, a quality of service QoS corresponding to an SL interface, or a transmission indicator corresponding to an SL interface, and for example, the channel quality corresponding to an SL interface includes one or more of a channel busy ratio CBR, a reference signal received power RSRP, a reference signal received quality RSRQ, a received signal strength indication RSSI, a channel quality indication CQI, channel state information CSI, a precoding matrix indication PMI in a multiple-input multiple-output MIMO system, a RANK indication RI in a MIMO system, or a RANK of a channel matrix in a MIMO system; the QoS corresponding to the SL interface comprises one or more of a QoS target, a QoS requirement or a QoS value; the sending index corresponding to the SL interface comprises one or more of transmission rate, path loss PathLoss, Power Headroom Report (PHR), Timing Advance (TA), Modulation and Coding Strategy (MCS), Power or block error rate (BLER); the QoS value comprises delay, reliability, rate/throughput, communication distance or Payload.

In one possible design, the first HARQ configuration information is generated by the first terminal device according to the second HARQ configuration information.

In one possible design, before the second terminal device receives the first HARQ configuration information sent by the first terminal device, the method further includes: the second terminal device receives measurement configuration information for configuring a measurement event sent by the first terminal device, wherein the measurement configuration information comprises at least one measurement object and a reporting configuration requirement corresponding to the measurement event; the second terminal device measures the at least one measurement object to obtain a first measurement value; and when the first measurement value meets at least one of the reporting configuration requirements, the second terminal device sends a measurement report of the measurement event to the first terminal device, where the measurement report is used for the first terminal device to generate the first HARQ configuration information.

In one possible design, the receiving, by the second terminal device, the first HARQ configuration information sent by the first terminal device includes: and the second terminal equipment receives the first HARQ configuration information sent by the first terminal equipment through third communication equipment.

In one possible design, the receiving, by the second terminal device, the first HARQ configuration information sent by the first terminal device includes: the second terminal device receives the first HARQ configuration information sent by the first terminal device through a first signaling, where the first signaling includes RRC signaling, RLC signaling, PDCP signaling, MAC signaling, SDAP signaling, PC5-S signaling, SIB message, MAC signaling, or physical layer signaling.

In one possible design, after the second terminal device receives the first HARQ configuration information sent by the first terminal device through the first signaling, the method further includes: and the second terminal equipment receives a second signaling sent by the first terminal equipment, wherein the second signaling is used for activating the first indication information, and the second signaling comprises SCI signaling or MAC signaling.

In one possible design, when the state of the SL HARQ feedback switch of the second terminal device is changed (for example, the SL HARQ feedback switch is changed from on to off or from off to on), the second terminal device sends change instruction information to the first terminal device, and the first terminal device receives the change instruction information, where the change instruction information is used to instruct the second terminal device whether to perform SL HARQ feedback (or used to instruct the SL HARQ feedback switch of the second terminal device to be changed from on to off or from off to on).

In a possible design, when the state of the SL HARQ feedback switch of the second terminal device changes (for example, the SL HARQ feedback switch changes from on to off, or from off to on), the second terminal device sends change instruction information to the network device, and the network device receives the change instruction information sent by the second terminal device, where the change instruction information is used to instruct the second terminal device whether to perform SL HARQ feedback.

In a third aspect, an embodiment of the present invention provides a HARQ feedback control method, which is applied to a network device side. In the embodiment of the present invention, the network device may configure an SL HARQ feedback switch for the terminal device, where the SL HARQ feedback switch is used to represent whether the terminal device needs to perform SL HARQ feedback after receiving SL data. The method comprises the following steps: the network equipment sends HARQ configuration information to the terminal equipment, wherein the HARQ configuration information comprises indication information indicating whether the terminal equipment carries out HARQ feedback aiming at the data of the side link SL. By implementing the embodiment of the invention, the network equipment can directly configure the SL HARQ feedback switch for the terminal equipment, so that the requirements in various aspects can be met, for example, the load can be reduced by not starting the SL HARQ when the load is high, for example, the load can be reduced by not starting the SL HARQ for low-delay service, the transmission efficiency is not influenced, the QoS requirement can be met by only carrying out blind retransmission on the low-reliability service, the occupation of SL HARQ resources can be reduced, and the like.

In a possible design, if the indication information indicates that the terminal device performs HARQ feedback for SL data, an interface for the terminal device to perform HARQ feedback includes a sidelink SL interface or a Uu air interface. That is, after receiving the SL data, the Rx UE may feed back HARQ to the Rx UE through the SL interface, or may directly feed back HARQ to the base station through the Uu interface.

In one possible design, the condition to which the indication information applies includes: the terminal device is in a non-scheduling authorization mode, the terminal device is in a dynamic scheduling mode, the terminal device is in a semi-persistent scheduling mode, the terminal device is in an autonomous contention mode, the SL data is data transmitted using a predetermined radio access technology, the SL data is data transmitted using a predetermined carrier, the SL data is data transmitted using a predetermined frequency, the terminal device is located at a predetermined base station, the terminal device is located in a predetermined cell, the terminal device is a predetermined target terminal, the terminal device is a terminal included in a predetermined group, the SL data is data corresponding to a predetermined service, the SL data is data satisfying a predetermined quality of service, the SL data is data transmitted using a predetermined carrier bandwidth part BWP, the SL data is data transmitted using a predetermined logical channel group, The SL data is one or more of data transmitted using a preset logical channel, data transmitted using a preset communication connection, data transmitted using a preset group connection, or data corresponding to a preset HARQ process.

In a possible design, if the indication information indicates that the terminal device performs HARQ feedback for SL data, the HARQ configuration information further includes preset condition information, where the preset condition information is used to indicate a condition for the terminal device to perform HARQ feedback for SL data.

In one possible design, the conditions to which the measurement object applies include: the terminal device is in a non-scheduling authorization mode, the terminal device is in a dynamic scheduling mode, the terminal device is in a semi-persistent scheduling mode, the terminal device is in an autonomous contention mode, the SL data is data transmitted using a predetermined radio access technology, the SL data is data transmitted using a predetermined carrier, the SL data is data transmitted using a predetermined frequency, the terminal device is located at a predetermined base station, the terminal device is located in a predetermined cell, the terminal device is a predetermined target terminal, the terminal device is a terminal included in a predetermined group, the SL data is data corresponding to a predetermined service, the SL data is data satisfying a predetermined quality of service, the SL data is data transmitted using a predetermined carrier bandwidth part BWP, the SL data is data transmitted using a predetermined logical channel group, The SL data is data transmitted using a preset logical channel, the SL data is data transmitted using a preset communication connection, or the SL data is data transmitted using a preset group connection.

In one possible design, before the network device sends HARQ configuration information to the terminal device, the method further includes: the network equipment sends measurement configuration information of the measurement event to the terminal equipment, wherein the measurement configuration information comprises at least one measurement object and a reporting configuration requirement corresponding to the measurement event; the network device receives a measurement report of the measurement event sent by the terminal device, where the measurement report is sent by the terminal device when a first measurement value meets at least one of the reporting configuration requirements, and the first measurement value is obtained by the terminal device measuring the at least one measurement object; and the network equipment generates the HARQ configuration information according to the measurement report.

In one possible design, the conditions to which the measurement event applies include: the terminal device is in a non-scheduling authorization mode, the terminal device is in a dynamic scheduling mode, the terminal device is in an autonomous contention mode, the SL data is data transmitted using a preset radio access technology, the SL data is data transmitted using a preset carrier, the SL data is data transmitted using a preset frequency, the terminal device is located in a preset base station, the terminal device is located in a preset cell, the terminal device is a preset target terminal, the terminal device is a terminal included in a preset group, the SL data is data corresponding to a preset service, the SL data is data satisfying a preset quality of service, the SL data is data transmitted using a preset carrier bandwidth part BWP, the SL data is data transmitted using a preset logical channel group, the SL data is data transmitted using a preset logical channel part BWP, the SL data is data transmitted using a preset logical channel, and the SL data is data transmitted using a preset logical channel, The SL data is one or more of data transmitted using a preset communication connection and data transmitted using a preset group connection.

In one possible design, the number of terminal devices includes one or more. For example, the number of the terminal devices is one for a unicast scenario, and the number of the terminal devices is multiple for a multicast or broadcast scenario.

In one possible design, the sending, by the network device, the HARQ configuration information to a terminal device includes: and the network equipment sends the HARQ configuration information to the terminal equipment through a third signaling, wherein the third signaling comprises RRC signaling, RLC signaling, PDCP signaling, MAC signaling, SDAP signaling, NAS signaling, SIB information, MAC signaling or physical layer signaling.

In one possible design, after the network device sends the HARQ configuration information to the terminal device through a third signaling, the method further includes: and the network equipment sends a fourth signaling to the terminal equipment, wherein the fourth signaling is used for activating the indication information, and the fourth signaling comprises MAC signaling or DCI signaling.

In one possible design, the terminal device is one or more of a group or a group of devices.

In one possible design, the granularity for which the indication information is directed is indicated explicitly or implicitly.

In a fourth aspect, an embodiment of the present invention provides a HARQ feedback control method, which is applied to a terminal device side. In the embodiment of the present invention, the network device may configure an SL HARQ feedback switch for the terminal device, where the SL HARQ feedback switch is used to represent whether the terminal device needs to perform SL HARQ feedback after receiving SL data. The method comprises the following steps: the method comprises the steps that terminal equipment receives HARQ configuration information sent by network equipment, wherein the HARQ configuration information comprises indication information indicating whether the terminal equipment carries out HARQ feedback on side-link SL data. If the indication information indicates that the terminal device performs HARQ feedback for the SL data, the terminal device needs to perform HARQ feedback after receiving the SL data. If the indication information indicates that the terminal device does not perform HARQ feedback for the SL data, the terminal device does not need to perform HARQ feedback after receiving the SL data. By implementing the embodiment of the invention, the network equipment can directly configure the SL HARQ feedback switch for the terminal equipment, so that the requirements in various aspects can be met, for example, the load can be reduced by not starting the SL HARQ when the load is high, for example, the load can be reduced by not starting the SL HARQ for low-delay service, the transmission efficiency is not influenced, the QoS requirement can be met by only carrying out blind retransmission on the low-reliability service, the occupation of SL HARQ resources can be reduced, and the like.

In one possible design, before the terminal device receives HARQ configuration information sent by a network device, the method further includes: the terminal equipment receives measurement configuration information of a measurement event sent by network equipment, wherein the measurement configuration information comprises at least one measurement object and a reporting configuration requirement corresponding to the measurement event; and the terminal equipment measures the at least one measuring object to obtain a first measuring value. And when the first measurement value meets at least one of the reporting configuration requirements, the terminal device sends a measurement report of the measurement event to the network device, where the measurement report is used for the network device to generate the HARQ configuration information.

In one possible design, the receiving, by the terminal device, the HARQ configuration information sent by a network device includes: and the terminal equipment receives the HARQ configuration information sent by the network equipment through a third signaling, wherein the third signaling comprises RRC signaling, RLC signaling, PDCP signaling, MAC signaling, SDAP signaling, NAS signaling, SIB information, MAC signaling or physical layer signaling.

In one possible design, after the terminal device receives the HARQ configuration information sent by the network device through the third signaling, the method further includes: and the terminal equipment receives a fourth signaling sent by the network equipment, wherein the fourth signaling is used for activating the indication information, and the fourth signaling comprises MAC signaling or DCI signaling.

In one possible design, when the state of the SL HARQ feedback switch of the terminal device changes (for example, the SLHARQ feedback switch changes from on to off or from off to on), the terminal device sends change instruction information to the terminal device at its opposite end, and the terminal device at its opposite end receives the change instruction information, where the change instruction information is used to instruct the terminal device whether to perform SL HARQ feedback (or to instruct the SL HARQ feedback switch of the terminal device to change from on to off or from off to on).

In one possible design, when the state of the SL HARQ feedback switch of the terminal device is changed (for example, the SLHARQ feedback switch is changed from on to off or from off to on), the terminal device transmits change instruction information to the network device, and the network device receives the change instruction information transmitted by the terminal device, where the change instruction information is used to instruct the terminal device whether to perform SLHARQ feedback.

In a fifth aspect, an embodiment of the present invention provides a HARQ feedback control method, which is applied to a terminal device side. In the embodiment of the present invention, the UE may configure the SL HARQ feedback switch for itself, for example, the Tx UE configures the HARQ feedback switch for the Rx UE, and the Tx UE may also configure the HARQ feedback switch for itself. The method comprises the following steps: terminal equipment configures HARQ configuration information, wherein the HARQ configuration information is used for indicating whether the terminal equipment carries out HARQ feedback on the data of the side link SL.

In a possible design, if the HARQ configuration information indicates that the terminal device performs HARQ feedback for SL data, an interface for the terminal device to perform HARQ feedback includes a sidelink SL or Uu air interface. That is, after receiving the SL data, the Rx UE may feed back HARQ to the Rx UE through the SL interface, or may directly feed back HARQ to the base station through the Uu interface.

In one possible design, the conditions for which the HARQ configuration information applies include: the terminal device is in a non-scheduling authorization mode, the terminal device is in a dynamic scheduling mode, the terminal device is in a semi-persistent scheduling mode, the terminal device is in an autonomous contention mode, the SL data is data transmitted using a predetermined radio access technology, the SL data is data transmitted using a predetermined carrier, the SL data is data transmitted using a predetermined frequency, the terminal device is located at a predetermined base station, the terminal device is located in a predetermined cell, the terminal device is a predetermined target terminal, the terminal device is a terminal included in a predetermined group, the SL data is data corresponding to a predetermined service, the SL data is data satisfying a predetermined quality of service, the SL data is data transmitted using a predetermined carrier bandwidth part BWP, the SL data is data transmitted using a predetermined logical channel group, The SL data is one or more of data transmitted using a preset logical channel, data transmitted using a preset communication connection, data transmitted using a preset group connection, or data corresponding to a preset HARQ process.

In one possible design, the HARQ configuration information may be determined by the terminal device based on its measurement results. Exemplarily, before configuring the HARQ configuration information for the terminal device, the method further includes: the terminal device measures at least one measurement object to obtain a first measurement value of a measurement event. The HARQ feedback switch of the terminal device specifically includes: if the first measurement value meets the preset starting condition of the SL HARQ feedback switch, the terminal equipment configures the HARQ feedback switch of the terminal equipment to be on, and if the first measurement value does not meet the preset starting condition of the SL HARQ feedback switch, the terminal equipment configures the HARQ feedback switch of the terminal equipment to be off.

In one possible design, the enabling condition includes that the preset measurement indicator is above, below, not above, or not below a preset threshold and/or that the preset measurement indicator is or is not in a preset value list.

In one possible design, the conditions to which the measurement object applies include: the terminal device is in a non-scheduling authorization mode, the terminal device is in a dynamic scheduling mode, the terminal device is in a semi-static scheduling mode, the terminal device is in an autonomous contention mode, the SL data is data transmitted using a preset radio access technology, the terminal device uses a preset carrier for transmission, the terminal device uses a preset frequency for transmission, the terminal device is located at a preset base station, the terminal device is located at a preset cell, the terminal device is a preset target terminal, the terminal device is a terminal included in a preset group, the terminal device transmits preset service data, the terminal device satisfies a preset service quality, the terminal device uses a preset carrier bandwidth part BWP for transmission, the terminal device uses a preset logical channel group for transmission, the terminal device uses a preset logical channel for transmission, The terminal device uses one or more of a preset communication connection transmission or a preset group connection transmission.

In one possible design, when the state of the SL HARQ feedback switch of the terminal device changes (for example, the SLHARQ feedback switch changes from on to off or from off to on), the terminal device sends change instruction information to the terminal device at the opposite side of the SL, and the terminal device at the opposite side receives the change instruction information, where the change instruction information is used to instruct the terminal device whether to perform SL HARQ feedback.

In one possible design, if the state of the SL HARQ feedback switch of the terminal device changes (for example, the SLHARQ feedback switch changes from on to off or from off to on), the terminal device sends change instruction information to the network device, and the network device receives the change instruction information sent by the terminal device, where the change instruction information is used to instruct the terminal device whether to perform SL HARQ feedback.

In a sixth aspect, an embodiment of the present invention provides a HARQ feedback control method, which is applied to a first communication device side. In the embodiment of the present invention, the first communication device may configure a Uu HARQ feedback switch for the second communication device, where the Uu HARQ feedback switch is used to characterize whether the second communication device needs to perform Uu HARQ feedback after receiving Uu data. The method comprises the following steps: the first communication device acquires HARQ configuration information. The first communication device sends the HARQ configuration information to the second communication device, wherein the HARQ configuration information comprises indication information indicating whether the second communication device carries out HARQ feedback aiming at Uu data. By implementing the embodiment of the invention, the communication equipment can realize the configuration/application of the self-adaptive Uu HARQ switch, so that the Uu HARQ feedback is more flexible, and the requirements in various aspects can be met, for example, the Uu HARQ can be not started in high load to reduce the load, for example, the Uu HARQ is not started in low delay service to facilitate the reduction of the load and simultaneously not influence the transmission efficiency, the QoS requirement can be achieved by blind retransmission of the low-reliability service, the Uu HARQ resource occupation can also be reduced, and the like.

In one possible design, the obtaining, by the first communication device, the HARQ configuration information may be: the first communication device generates HARQ configuration information, that is, the first communication device configures a Uu HARQ feedback switch for the second communication device. Or, the first communication device acquiring the HARQ configuration information may be: the first communication device receives HARQ configuration information sent by the network device, that is, the network device configures a Uu HARQ feedback switch for the second communication device.

In one possible design, the Uu data may include data for one or more traffic types of unicast, multicast, or broadcast.

In one possible design, the Uu data includes data of a transport block TB of a medium access control MAC layer and/or a code block group CBG type of a physical layer.

In one possible design, the condition to which the indication information applies includes: the first communication device is in a non-scheduling authorization mode, the first communication device is in a dynamic scheduling mode, the first communication device is in a semi-persistent scheduling mode, the first communication device is in an autonomous contention mode, the Uu data is data transmitted using a predetermined radio access technology, the Uu data is data transmitted using a predetermined carrier, the Uu data is data transmitted using a predetermined frequency, the first communication device is located in a predetermined base station, the first communication device is located in a predetermined cell, the second communication device is located in a predetermined base station, the second communication device is located in a predetermined cell, the first communication device is a predetermined source terminal, the second communication device is a predetermined target terminal, the second communication device is a predetermined terminal included in a group, the Uu data is data corresponding to a predetermined service, and the first communication device is in a semi-persistent scheduling mode The Uu data is one or more of data meeting a preset service quality, the Uu data is data transmitted by using a preset carrier bandwidth part BWP, the Uu data is data transmitted by using a preset logical channel group, the Uu data is data transmitted by using a preset logical channel, the Uu data is data transmitted by using a preset communication connection, and the Uu data is data transmitted by using a preset group connection or data corresponding to a preset HARQ process.

In a possible design, if the indication information indicates that the second communication device performs HARQ feedback for the Uu data, the HARQ configuration information further includes preset condition information, where the preset condition information is used to indicate a condition for performing HARQ feedback for the Uu data by the second communication device.

In one possible design, the measurement object corresponding to the preset measurement index includes one or more of a frequency point/resource pool/BWP required to be measured in Uu, a reference signal required to be measured in Uu, and resource configuration information, where the reference signal includes a synchronization signal block SSB, a channel state information reference signal CSI-RS, a demodulation reference signal DMRS, a phase tracking reference signal PTRS, or a channel sounding reference signal SRS, and the resource configuration information includes any combination of a time domain, a frequency domain, or a space domain.

In one possible design, the conditions to which the measurement object applies include: the first communication device is in a non-scheduling authorization mode, the first communication device is in a dynamic scheduling mode, the first communication device is in a semi-persistent scheduling mode, the first communication device is in an autonomous contention mode, the Uu data is data transmitted using a predetermined radio access technology, the Uu data is data transmitted using a predetermined carrier, the Uu data is data transmitted using a predetermined frequency, the first communication device is located in a predetermined base station, the first communication device is located in a predetermined cell, the second communication device is located in a predetermined base station, the second communication device is located in a predetermined cell, the first communication device is a predetermined source terminal, the second communication device is a predetermined target terminal, the second communication device is a predetermined terminal included in a group, the Uu data is data corresponding to a predetermined service, and the first communication device is in a semi-persistent scheduling mode The Uu data is data satisfying a preset quality of service, the Uu data is data transmitted using a preset BWP, the Uu data is data transmitted using a preset logical channel group, the Uu data is data transmitted using a preset logical channel, the Uu data is data transmitted using a preset communication connection, or the Uu data is data transmitted using a preset group connection.

In one possible design, the preset measurement indicator includes any one or more of a channel quality corresponding to a Uu interface, a quality of service QoS corresponding to the Uu interface, or a transmission indicator corresponding to the Uu interface, for example, the channel quality corresponding to the Uu interface includes one or more of a channel busy ratio CBR, a reference signal received power RSRP, a reference signal received quality RSRQ, a received signal strength indication RSSI, a channel quality indication CQI, a channel state information CSI, a precoding matrix indication PMI in a multiple-input multiple-output MIMO system, a RANK indication RI in the MIMO system, or a RANK of a channel matrix in the MIMO system; the QoS corresponding to the Uu interface comprises one or more of a QoS target, a QoS requirement or a QoS value; the sending index corresponding to the Uu interface comprises one or more of transmission rate, path loss, Power Headroom Report (PHR), Timing Advance (TA), Modulation and Coding Strategy (MCS), power or block error rate; the QoS value includes latency, reliability, rate, throughput, communication distance, or payload.

In one possible design, before the obtaining of the HARQ configuration information by the first communication device, the method further includes: the first communication device sends measurement configuration information of a measurement event to the second communication device, wherein the measurement configuration information comprises at least one measurement object and a reporting configuration requirement corresponding to the measurement event; the first communication device receives a measurement report of the measurement event sent by the second communication device, where the measurement report is sent by the second communication device when a first measurement value meets at least one of the reporting configuration requirements, and the first measurement value is obtained by the second communication device measuring the at least one measurement object; the first communication device acquires HARQ configuration information, specifically: the first communication device generates the HARQ configuration information according to the measurement report.

In one possible design, the conditions to which the measurement event applies include: the first communication device is in a non-scheduling authorization mode, the first communication device is in a dynamic scheduling mode, the first communication device is in a semi-persistent scheduling mode, the first communication device is in an autonomous contention mode, the Uu data is data transmitted using a predetermined radio access technology, the Uu data is data transmitted using a predetermined carrier, the Uu data is data transmitted using a predetermined frequency, the first communication device is located in a predetermined base station, the first communication device is located in a predetermined cell, the second communication device is located in a predetermined base station, the second communication device is located in a predetermined cell, the first communication device is a predetermined source terminal, the second communication device is a predetermined target terminal, the second communication device is a predetermined terminal included in a group, the Uu data is data corresponding to a predetermined service, and the first communication device is in a semi-persistent scheduling mode The Uu data is one or more of data satisfying a preset quality of service, the Uu data is data transmitted using a preset carrier bandwidth part BWP, the Uu data is data transmitted using a preset logical channel group, the Uu data is data transmitted using a preset logical channel, the Uu data is data transmitted using a preset communication connection, and the Uu data is data transmitted using a preset group connection.

In one possible design, the number of second communication devices includes one or more. For example, the number of the second communication devices is one for a unicast scenario, and the number of the second communication devices is multiple for a multicast or broadcast scenario.

In one possible design, the transmitting, by the first communication device, the HARQ configuration information to the second communication device includes: and the first communication equipment sends the HARQ configuration information to the second communication equipment through third communication equipment.

In one possible design, the transmitting, by the first communication device, the HARQ configuration information to the second communication device includes: the first communication device sends the HARQ configuration information to the second communication device through a first signaling, wherein the first signaling comprises RRC signaling, RLC signaling, PDCP signaling, MAC signaling, SDAP signaling, NAS signaling, SIB messages, MAC signaling or physical layer signaling.

In one possible design, after the first communication device sends the HARQ configuration information to the second communication device through a first signaling, the method further includes: the first communication device sends a second signaling to the second communication device, wherein the second signaling is used for activating the indication information, and the second signaling comprises DCI signaling or MAC signaling.

In one possible design, the second communication device is one or more of a group or a group of devices.

In one possible design, when the state of the Uu HARQ feedback switch of the second communication device is changed (for example, the Uu HARQ feedback switch is changed from on to off or from off to on), the first communication device receives change indication information sent by the second communication device, and the second communication device receives change indication information sent by the first communication device, where the change indication information is used to indicate whether the second communication device performs Uu HARQ feedback (or is used to indicate that the Uu HARQ feedback switch of the second communication device is changed from on to off or from off to on).

In a seventh aspect, an embodiment of the present invention provides a HARQ feedback control method, which is applied to a second communications device side. In the embodiment of the present invention, the first communication device may configure a Uu HARQ feedback switch for the second communication device, where the Uu HARQ feedback switch is used to characterize whether the second communication device needs to perform Uu HARQ feedback after receiving Uu data. The method comprises the following steps: the second communication equipment receives HARQ configuration information sent by the first communication equipment, wherein the HARQ configuration information comprises indication information indicating whether the second communication equipment carries out HARQ feedback on the side-link Uu data. If the indication information indicates that the second communication device performs HARQ feedback for the Uu data, the second communication device needs to perform HARQ feedback after receiving the Uu data. If the indication information indicates that the second communication device does not perform HARQ feedback for the Uu data, the second communication device does not need to perform HARQ feedback after receiving the Uu data. By implementing the embodiment of the invention, the communication equipment can realize the configuration/application of the self-adaptive uuHARQ switch, so that the Uu HARQ feedback is more flexible, and the requirements in various aspects can be met, for example, the Uu HARQ can be not started in high load to reduce the load, for example, the Uu HARQ is not started in low delay service to facilitate the reduction of the load and simultaneously not influence the transmission efficiency, the QoS requirement can be achieved by blind retransmission of the low-reliability service, the Uu HARQ resource occupation can be reduced, and the like.

In one possible design, the HARQ configuration information is generated by the first communication device or received by the first communication device from other devices.

In one possible design, the conditions to which the measurement object applies include: the first communication device is in a non-scheduling authorization mode, the first communication device is in a dynamic scheduling mode, the first communication device is in a semi-persistent scheduling mode, the first communication device is in an autonomous contention mode, the Uu data is data transmitted using a predetermined radio access technology, the Uu data is data transmitted using a predetermined carrier, the Uu data is data transmitted using a predetermined frequency, the first communication device is located in a predetermined base station, the first communication device is located in a predetermined cell, the second communication device is located in a predetermined base station, the second communication device is located in a predetermined cell, the first communication device is a predetermined source terminal, the second communication device is a predetermined target terminal, the second communication device is a predetermined terminal included in a group, the Uu data is data corresponding to a predetermined service, and the first communication device is in a semi-persistent scheduling mode The Uu data is data satisfying a preset quality of service, the Uu data is data transmitted using a preset carrier bandwidth part BWP, the Uu data is data transmitted using a preset logical channel group, the Uu data is data transmitted using a preset logical channel, the Uu data is data transmitted using a preset communication connection, or the Uu data is data transmitted using a preset group connection.

In one possible design, the preset measurement indicator includes any one or more of a channel quality corresponding to a Uu interface, a quality of service QoS corresponding to the Uu interface, or a transmission indicator corresponding to the Uu interface, for example, the channel quality corresponding to the Uu interface includes one or more of a channel busy ratio CBR, a reference signal received power RSRP, a reference signal received quality RSRQ, a received signal strength indication RSSI, a channel quality indication CQI, a channel state information CSI, a precoding matrix indication PMI in a multiple-input multiple-output MIMO system, a RANK indication RI in the MIMO system, or a RANK of a channel matrix in the MIMO system; the QoS corresponding to the Uu interface comprises one or more of a QoS target, a QoS requirement or a QoS value; the sending index corresponding to the Uu interface comprises one or more of transmission rate, path loss PathLoss, Power Headroom Report (PHR), Time Advance (TA), Modulation and Coding Strategy (MCS), Power or block error rate (BLER); the QoS value comprises delay, reliability, rate/throughput, communication distance or Payload.

In one possible design, before the second communication device receives the HARQ configuration information sent by the first communication device, the method further includes: the second communication device receives measurement configuration information for configuring a measurement event sent by the first communication device, wherein the measurement configuration information comprises at least one measurement object and a reporting configuration requirement corresponding to the measurement event; the second communication equipment measures the at least one measuring object to obtain a first measured value; and when the first measurement value meets at least one of the reporting configuration requirements, the second communication device sends a measurement report of the measurement event to the first communication device, where the measurement report is used for the first communication device to generate the HARQ configuration information.

In one possible design, the receiving, by the second communication device, the HARQ configuration information sent by the first communication device includes: and the second communication equipment receives the HARQ configuration information sent by the first communication equipment through third communication equipment.

In one possible design, the receiving, by the second communication device, the HARQ configuration information sent by the first communication device includes: the second communication device receives the HARQ configuration information sent by the first communication device through a first signaling, where the first signaling includes RRC signaling, RLC signaling, PDCP signaling, MAC signaling, SDAP signaling, NAS signaling, SIB message, MAC signaling, or physical layer signaling.

In one possible design, after the second communication device receives the HARQ configuration information sent by the first communication device through the first signaling, the method further includes: and the second communication equipment receives a second signaling sent by the first communication equipment, wherein the second signaling is used for activating the indication information, and the second signaling comprises DCI signaling or MAC signaling.

In one possible design, when the state of the Uu HARQ feedback switch of the second communication device is changed (for example, the Uu HARQ feedback switch is changed from on to off or from off to on), the second communication device sends change indication information to the first communication device, and the first communication device receives the change indication information, where the change indication information is used for indicating whether the second communication device performs Uu HARQ feedback.

In an eighth aspect, an embodiment of the present invention further provides a HARQ feedback control method, configured to update a state of a HARQ feedback switch. The method comprises the following steps: when the state of the HARQ feedback switch of the first communication equipment is changed, the first communication equipment sends change indication information to the second communication equipment, the second communication equipment receives the change indication information sent by the first communication equipment, and the change indication information is used for indicating that the HARQ feedback switch of the first communication equipment is changed from on to off or from off to on. By implementing the embodiment of the invention, when the HARQ feedback state of the communication equipment is changed, the HARQ feedback state can be notified to other communication equipment (such as a communication opposite end), so that the communication opposite end can know the HARQ feedback state of the communication equipment, and the communication performance is improved.

Illustratively, the HARQ feedback switch may be an SL HARQ feedback switch for SL data, and may also be a Uu HARQ feedback switch for Uu data. If the HARQ feedback switch is an SL HARQ feedback switch for SL data, the first communication device may be a first terminal device, the second communication device may be a second terminal device performing SL communication with the first terminal device, and the second communication device may also be a network device serving the first terminal device. If the HARQ feedback switch is a Uu HARQ feedback switch for Uu data, the first communication device may be a terminal device, and the second communication device may be a network device, or the first communication device may be a network device and the second communication device may be a terminal device.

In a ninth aspect, an embodiment of the present invention provides a terminal device, where the terminal device is a first terminal device, and the first terminal device may include a plurality of functional modules or units, and is configured to correspondingly execute the HARQ feedback control method provided in the first aspect, or the HARQ feedback control method provided in any one of possible implementations of the first aspect.

In a tenth aspect, an embodiment of the present invention provides another terminal device, where the terminal device is a second terminal device, and the second terminal device may include a plurality of functional modules or units, and is configured to correspondingly execute the HARQ feedback control method provided in the second aspect, or the HARQ feedback control method provided in any one of possible implementations of the second aspect.

In an eleventh aspect, an embodiment of the present invention provides a network device, where the network device may include a plurality of functional modules or units, and is configured to correspondingly execute the HARQ feedback control method provided in the third aspect, or the HARQ feedback control method provided in any one of possible implementations of the third aspect.

In a twelfth aspect, an embodiment of the present invention provides another terminal device, where the terminal device may include a plurality of functional modules or units, and is configured to correspondingly execute the HARQ feedback control method provided in the fourth aspect, or the HARQ feedback control method provided in any one of possible implementations of the fourth aspect.

In a thirteenth aspect, an embodiment of the present invention provides a terminal device, where the terminal device may include a plurality of functional modules or units, and is configured to correspondingly execute the HARQ feedback control method provided in the fifth aspect, or the HARQ feedback control method provided in any one of possible implementations of the fifth aspect.

In a fourteenth aspect, an embodiment of the present invention provides a communication device, where the communication device is a first communication device, and the first communication device may include a plurality of functional modules or units, and is configured to correspondingly execute the HARQ feedback control method provided in the sixth aspect, or the HARQ feedback control method provided in any one of the possible implementations of the sixth aspect.

In a fifteenth aspect, an embodiment of the present invention provides a communication device, which is a second communication device, where the second communication device may include a plurality of functional modules or units, and is configured to correspondingly execute the HARQ feedback control method provided in the seventh aspect, or the HARQ feedback control method provided in any one of the possible implementation manners of the seventh aspect.

In a sixteenth aspect, an embodiment of the present invention provides a communication device, which may include a plurality of functional modules or units, and is configured to correspondingly execute the HARQ feedback control method provided in the eighth aspect, or the HARQ feedback control method provided in any one of the possible implementation manners of the eighth aspect.

In a seventeenth aspect, an embodiment of the present invention provides a terminal device, configured to execute the HARQ feedback control method described in the first aspect. The terminal device is a first terminal device, and the first terminal device may include: a memory, and a processor, transmitter, receiver coupled with the memory. Illustratively, the transmitter is configured to support the first terminal device to perform the step of sending information by the first terminal device in the HARQ feedback control method provided in the first aspect. The receiver is configured to support the first terminal device to perform the step of receiving information by the first terminal device in the HARQ feedback control method provided in the first aspect. The processor is configured to support the first terminal device to perform other processing steps except for sending and receiving information for the first terminal device in the HARQ feedback control method provided in the first aspect. It should be noted that the transmitter and the receiver in the embodiment of the present invention may be integrated together, or may be coupled through a coupler. The memory is configured to store implementation codes of the HARQ feedback control method described in the first aspect, and the processor is configured to execute the program codes stored in the memory, that is, to execute the HARQ feedback control method provided in the first aspect, or the HARQ feedback control method provided in any one of the possible implementations of the first aspect. The memory and the processor may be integrated together or may be coupled by a coupler.

In an eighteenth aspect, an embodiment of the present invention provides a terminal device, configured to execute the HARQ feedback control method described in the second aspect. The terminal device is a second terminal device, and the second terminal device may include: a memory, and a processor, transmitter, receiver coupled with the memory. Illustratively, the transmitter is configured to support the second terminal device to perform the step of the second terminal device sending information in the HARQ feedback control method provided in the second aspect. The receiver is configured to support the second terminal device to perform the step of receiving information by the second terminal device in the HARQ feedback control method provided in the second aspect. The processor is configured to support the second terminal device to perform other processing steps except for sending and receiving information in the HARQ feedback control method provided in the second aspect. It should be noted that the transmitter and the receiver in the embodiment of the present invention may be integrated together, or may be coupled through a coupler. The memory is used for storing implementation codes of the HARQ feedback control method described in the second aspect, and the processor is used for executing the program codes stored in the memory, that is, executing the HARQ feedback control method provided by the second aspect, or the HARQ feedback control method provided by any one of the possible embodiments of the second aspect. The memory and the processor may be integrated together or may be coupled by a coupler.

In a nineteenth aspect, an embodiment of the present invention provides a network device, configured to execute the HARQ feedback control method described in the third aspect. The network device may include: a memory, and a processor, transmitter, receiver coupled with the memory. Illustratively, the transmitter is configured to support the network device to perform the step of the network device sending information in the HARQ feedback control method provided in the third aspect. The receiver is configured to support a network device to perform the step of receiving information by the network device in the HARQ feedback control method provided in the third aspect. The processor is configured to support the network device to perform other processing steps except for sending and receiving information in the HARQ feedback control method provided in the third aspect. It should be noted that the transmitter and the receiver in the embodiment of the present invention may be integrated together, or may be coupled through a coupler. The memory is configured to store implementation codes of the HARQ feedback control method described in the third aspect, and the processor is configured to execute the program codes stored in the memory, that is, to execute the HARQ feedback control method provided in the third aspect, or the HARQ feedback control method provided in any one of the possible implementations of the third aspect. The memory and the processor may be integrated together or may be coupled by a coupler.

In a twentieth aspect, an embodiment of the present invention provides a terminal device, configured to execute the HARQ feedback control method described in the fourth aspect. The terminal device is a terminal device, and the terminal device may include: a memory, and a processor, transmitter, receiver coupled with the memory. Illustratively, the transmitter is configured to support the terminal device to perform the step of sending information by the terminal device in the HARQ feedback control method provided in the fourth aspect. The receiver is configured to support the terminal device to perform the step of receiving information by the terminal device in the HARQ feedback control method provided in the fourth aspect. The processor is configured to support the terminal device to perform other processing steps except for sending and receiving information by the terminal device in the HARQ feedback control method provided in the fourth aspect. It should be noted that the transmitter and the receiver in the embodiment of the present invention may be integrated together, or may be coupled through a coupler. The memory is configured to store implementation codes of the HARQ feedback control method described in the fourth aspect, and the processor is configured to execute the program codes stored in the memory, that is, to execute the HARQ feedback control method provided in the fourth aspect, or the HARQ feedback control method provided in any one of the possible implementations of the fourth aspect. The memory and the processor may be integrated together or may be coupled by a coupler.

In a twenty-first aspect, an embodiment of the present invention provides a terminal device, configured to execute the HARQ feedback control method described in the fifth aspect. The terminal device is a terminal device, and the terminal device may include: a memory, and a processor, transmitter, receiver coupled with the memory. Illustratively, the transmitter is configured to support the terminal device to perform the step of sending information by the terminal device in the HARQ feedback control method provided by the fifth aspect. The receiver is configured to support the terminal device to perform the step of receiving information by the terminal device in the HARQ feedback control method provided by the fifth aspect. The processor is configured to support the terminal device to perform other processing steps except for sending and receiving information in the HARQ feedback control method provided by the fifth aspect. It should be noted that the transmitter and the receiver in the embodiment of the present invention may be integrated together, or may be coupled through a coupler. The memory is used for storing implementation codes of the HARQ feedback control method described in the fifth aspect, and the processor is used for executing the program codes stored in the memory, that is, executing the HARQ feedback control method provided by the fifth aspect, or the HARQ feedback control method provided by any one of the possible embodiments of the fifth aspect. The memory and the processor may be integrated together or may be coupled by a coupler.

In a twenty-second aspect, an embodiment of the present invention provides a communication device, configured to execute the HARQ feedback control method described in the sixth aspect. The communication device is a first communication device, and the first communication device may include: a memory, and a processor, transmitter, receiver coupled with the memory. Illustratively, the transmitter is configured to support the first communication device to perform the step of the first communication device transmitting information in the HARQ feedback control method provided in the sixth aspect. The receiver is configured to support the first communication device to perform the step of receiving information by the first communication device in the HARQ feedback control method provided by the sixth aspect. The processor is configured to support the first communication device to perform other processing steps of the HARQ feedback control method provided in the sixth aspect, except that the first communication device transmits and receives information. It should be noted that the transmitter and the receiver in the embodiment of the present invention may be integrated together, or may be coupled through a coupler. The memory is configured to store implementation codes of the HARQ feedback control method described in the sixth aspect, and the processor is configured to execute the program codes stored in the memory, that is, to execute the HARQ feedback control method provided in the sixth aspect, or the HARQ feedback control method provided in any one of possible implementations of the sixth aspect. The memory and the processor may be integrated together or may be coupled by a coupler.

In a twenty-third aspect, an embodiment of the present invention provides a communication device, configured to execute the HARQ feedback control method described in the seventh aspect. The communication device is a second communication device, and the second communication device may include: a memory, and a processor, transmitter, receiver coupled with the memory. Exemplarily, the transmitter is configured to support the second communication device to perform the step of the second communication device sending information in the HARQ feedback control method provided in the seventh aspect. The receiver is configured to support the second communication device to perform the step of receiving information by the second communication device in the HARQ feedback control method provided in the seventh aspect. The processor is configured to support the second communication device to perform other processing steps except for sending and receiving information by the second communication device in the HARQ feedback control method provided in the seventh aspect. It should be noted that the transmitter and the receiver in the embodiment of the present invention may be integrated together, or may be coupled through a coupler. The memory is configured to store implementation codes of the HARQ feedback control method described in the seventh aspect, and the processor is configured to execute the program codes stored in the memory, that is, to execute the HARQ feedback control method provided in the seventh aspect, or the HARQ feedback control method provided in any one of the possible implementations of the seventh aspect. The memory and the processor may be integrated together or may be coupled by a coupler.

In a twenty-fourth aspect, an embodiment of the present invention provides a communication device, configured to execute the HARQ feedback control method described in the eighth aspect. The communication device is a first communication device, and the first communication device may include: a memory, and a processor, transmitter, receiver coupled with the memory. Exemplarily, the transmitter is configured to support the first communication device to perform the step of the first communication device sending information in the HARQ feedback control method provided in the eighth aspect. The receiver is configured to support the first communication device to perform the step of receiving information by the first communication device in the HARQ feedback control method provided in the eighth aspect. The processor is configured to support the first communication device to perform other processing steps except for sending and receiving information in the HARQ feedback control method provided in the eighth aspect. It should be noted that the transmitter and the receiver in the embodiment of the present invention may be integrated together, or may be coupled through a coupler. The memory is configured to store implementation codes of the HARQ feedback control method described in the eighth aspect, and the processor is configured to execute the program codes stored in the memory, that is, execute the HARQ feedback control method provided in the eighth aspect, or execute the HARQ feedback control method provided in any one of the possible implementations of the eighth aspect. The memory and the processor may be integrated together or may be coupled by a coupler.

In a twenty-fifth aspect, an embodiment of the present invention provides a communication system, including a first terminal device and a second terminal device. Illustratively, the first terminal device may be the first terminal device as described in the aforementioned ninth aspect or seventeenth aspect, and the second terminal device may be the second terminal device as described in the aforementioned tenth aspect or eighteenth aspect.

In a twenty-sixth aspect, an embodiment of the present invention provides a communication system, including a network device and a terminal device. Illustratively, the network device may be a network device as described in the aforementioned eleventh aspect or nineteenth aspect, and the terminal device may be a terminal device as described in the aforementioned twelfth aspect or twentieth aspect.

In a twenty-seventh aspect, an embodiment of the present invention provides a communication system, which includes a first communication device and a second communication device. Illustratively, the first communication device may be a first communication device as described in the fourteenth or twenty-second aspect, and the second communication device may be a second communication device as described in the fifteenth or twenty-third aspect.

In a twenty-eighth aspect, an embodiment of the present invention provides a computer-readable storage medium, which stores instructions that, when executed on a computer, cause the computer to execute the HARQ feedback control method described in any one of the above aspects.

In a twenty-ninth aspect, embodiments of the present invention provide a computer program product containing instructions that, when run on a computer, cause the computer to perform the HARQ feedback control method described in any of the above aspects.

In a thirtieth aspect, an embodiment of the present invention provides a communication chip, where the communication chip may include: a processor, and one or more interfaces coupled to the processor. Illustratively, the processor may be configured to invoke an implementation procedure of the HARQ feedback control method provided in any of the above aspects from a memory, and execute instructions contained in the procedure. The interface may be used to output a processing result of the processor.

Drawings

Fig. 1 is a schematic diagram of a communication system according to an embodiment of the present invention;

fig. 2 is a schematic diagram of a mode3 transmission mode and a mode4 transmission mode in an LTE system according to an embodiment of the present invention;

fig. 3A is a schematic diagram of an application scenario provided in an embodiment of the present invention;

fig. 3B is a schematic diagram of another application scenario provided in the embodiment of the present invention;

fig. 3C is a schematic diagram of another application scenario provided in the embodiment of the present invention;

fig. 3D is a schematic diagram of another application scenario provided in the embodiment of the present invention;

fig. 3E is a schematic diagram of another application scenario provided in the embodiment of the present invention;

fig. 4 is a flowchart illustrating an HARQ feedback control method according to an embodiment of the present invention;

fig. 5 is a flowchart illustrating another HARQ feedback control method according to an embodiment of the present invention;

fig. 6 is a flowchart illustrating another HARQ feedback control method according to an embodiment of the present invention;

fig. 7 is a flowchart illustrating another HARQ feedback control method according to an embodiment of the present invention;

fig. 8 is a flowchart illustrating another HARQ feedback control method according to an embodiment of the present invention;

fig. 9 is a flowchart illustrating another HARQ feedback control method according to an embodiment of the present invention;

fig. 10 is a flowchart illustrating another HARQ feedback control method according to an embodiment of the present invention;

FIG. 11 is a schematic diagram of another application scenario provided by an embodiment of the present invention;

fig. 12 is a flowchart illustrating another HARQ feedback control method according to an embodiment of the present invention;

fig. 13 is a schematic diagram of a hardware structure of a terminal device according to an embodiment of the present invention;

fig. 14 is a schematic logical structure diagram of a terminal device according to an embodiment of the present invention;

fig. 15 is a schematic hardware structure diagram of a network device according to an embodiment of the present invention;

fig. 16 is a schematic hardware structure diagram of a network device according to an embodiment of the present invention;

fig. 17 is a schematic structural diagram of a communication chip according to an embodiment of the present invention.

Detailed Description

The embodiments of the present invention will be described below with reference to the drawings.

Fig. 1 presents a schematic view of a communication system to which the present application relates. The communication system 100 may include at least one network device 101 (only 1 shown), and a terminal device (UE) 102 and a terminal device 103 which perform uplink/downlink communication with the network device 101. The terminal device 102 and the terminal device 103 may be connected to the same network device, or may be connected to different network devices.

The terminal apparatus 102 and the terminal apparatus 103 perform a Sidelink (SL) communication. SL communication refers to direct communication between a terminal and a terminal, that is, direct communication between a terminal and a terminal without forwarding data through a network device. The terminal and the network device communicate with each other using an uplink and a downlink, where the exemplary uplink and downlink is defined for a Uu port of the network device and the user communication, the transmission from the network device to the terminal is Downlink (DL) transmission, and the transmission from the terminal to the network device is Uplink (UL) transmission.

Sidelink communications include two modes of transmission: the first communication mode is direct communication based on network device scheduling, and a sender terminal (transmit UE, Tx UE) transmits control information and data of SL communication on scheduled time-frequency resources according to scheduling information of the network device 101, which is called a base station scheduling mode. The base station scheduling mode is referred to as mode3 transmission mode in LTE and mode1 transmission mode in NR systems, described below in mode3 transmission mode; the second communication mode is that the terminal of the sending party automatically selects the time frequency resource used for communication from the available time frequency resources contained in the SL communication resource pool and sends control information and data on the selected resource, which is called as the UE autonomous competition mode. The UE autonomous contention mode is referred to as a mode4 transmission mode in LTE and a mode2 transmission mode in NR systems, and is described below in a mode4 transmission mode. It should be noted that the scheduling request/scheduling grant in the mode3 transmission mode still uses the uplink and downlink between the network device and the terminal for communication, and the uplink is used for direct communication between the Tx UE and the receiving terminal (Rx UE). The two transmission modes have advantages and disadvantages respectively, and can be flexibly applied to various different scenes. A schematic diagram of the mode3 transmission mode and the mode4 transmission mode can be seen in fig. 2.

The LTE mode3 transmission mode may also be subdivided into a dynamic scheduling (dynamic scheduling) mode and a semi-persistent scheduling (SPS) mode. In the dynamic scheduling mode, when the Tx UE has SL pending data, a Buffer Status Report (BSR) Medium Access Control (MAC) Control Element (CE) is reported to the network device 101 through the Uu port, and the network device 101 is notified of the data amount of the current Tx UE pending data transmission on the SL interface. The network device 101 may dynamically allocate transmission resources for Tx UEs, each time allocated transmission resource is used for transmission of one Medium Access Control (MAC) Packet Data Unit (PDU). In the SPS mode, the network device 101 may configure resources for Tx UEs, which may be used for transmission of multiple MAC PDUs, and (de) activate SPS configuration through Downlink Control Information (DCI). The NR mode1 transmission mode can be further subdivided into a dynamic scheduling mode and a scheduling free (scheduled) mode, the scheduling free mode can be further divided into two types, i.e., type1 and type2, type1 means that the network device can configure resources for Tx UEs, which can be used for multiple MAC PDU transmissions, and the Tx UEs can be directly applied after receiving the resources configured by the network device. Type2 indicates that the network device 101 can configure resources for Tx UE that can be used for multiple MAC PDU transmissions, and activate the configuration of grantfree through DCI (de) so that the Tx UE can apply the resources configured by the network device after receiving the activation instruction.

The embodiment of the application can be used for a transmission scene of a base station scheduling mode or a UE autonomous competition mode between communication devices, and can also be used for a transmission scene in a coexistence scene of the base station scheduling mode and the UE autonomous competition mode.

Illustratively, the sidelink communications may include unicast communications, multicast communications, and broadcast communications. The method and the device are suitable for unicast communication, multicast communication and broadcast communication. Illustratively, unicast communication refers to a transmitting terminal transmitting data to a receiving terminal. Multicast communication refers to a transmission terminal transmitting data to one or more reception terminals included in a group. Broadcast communication means that one transmitting terminal transmits data to all terminals, and any one terminal can receive data as a receiving terminal. For convenience of description, the following description of the embodiments takes unicast communication as an example, and the implementation method of multicast and broadcast communication may refer to unicast communication.

The embodiment of the application can be applied to a vehicle to vehicle (V2X) communication system, and V2X includes intelligent traffic services of vehicle to vehicle (V2V), vehicle to human (V2P), vehicle to infrastructure (V2I), vehicle to network (V2N), and the like.

The network device 101 related to the embodiment of the present application may include various forms of network devices, for example: macro base stations, micro base stations (also referred to as cells), relay stations, access points, cells (cells), and the like. Exemplary base stations may be evolved Node bs (enbs), and next-generation nodes (gnbs) in 5G systems, New Radio (NR) systems. In addition, the base station may also be a Transmission Receipt Point (TRP), a Central Unit (CU), or other network entity. In addition, in a distributed base station scenario, the network device 101 may be a baseband unit (BBU) and a radio frequency unit (RRU), and may be a baseband pool bbpool and a radio frequency unit RRU in a Cloud Radio Access Network (CRAN) scenario. In addition, the network device 101 may also be a core network device (CN), a Mobility Management Entity (MME) device, an access and mobility management function (AMF) device, a vehicle networking Control Function (CF) device, a GateWay (GateWay), a roadside device (RSU), an Operation Administration and Maintenance (OAM) device, an application server (APP server), or a third party network element.

The terminal device related to the embodiment of the present application may be a vehicle, a vehicle-mounted terminal, a vehicle-mounted device, a vehicle-mounted communication module, an embedded communication module, a baseband processing chip, a User Equipment (UE), a handheld terminal, a subscriber unit (subscriber unit), a wireless data card, a wireless modem (modem), a handheld device (handset), a Wireless Local Loop (WLL) station, a Machine Type Communication (MTC) terminal, or other devices.

It should be noted that the communication system 100 shown in fig. 1 is only for more clearly illustrating the technical solution of the present application, and does not constitute a limitation to the present application, and as a person having ordinary skill in the art knows, the technical solution provided in the present application is also applicable to similar technical problems as the network architecture evolves and new service scenarios emerge.

It should be noted that the terms "system" and "network" in the embodiments of the present invention may be used interchangeably. The "plurality" means two or more, and in view of this, the "plurality" may also be understood as "at least two" in the embodiments of the present invention. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" generally indicates that the preceding and following related objects are in an "or" relationship, unless otherwise specified.

First, the inventive concept of the present application is introduced, the current LTE V2X communication standard has no support for SL HARQ feedback, and the LTE V2X is designed to satisfy broadcast services with low QoS, and therefore, no support for unicast and multicast.

The NR V2X defines a high QoS class service, and the specific examples include: fleet platooning, enhanced sensors, advanced driving, remote driving. Meanwhile, compared with the LTE which only supports broadcast services, the NR V2X also supports unicast and multicast services and the corresponding high QoS requirements. In order to meet the high QoS index, unlike that LTE V2X does not support HARQ feedback, the embodiment of the present invention designs an HARQ feedback control scheme for unicast, multicast, and broadcast services of NR V2X to support the QoS requirement (e.g., simultaneous satisfaction of 3ms low latency and 99.999% reliability).

For example, if the SL unicast transmission is performed once, the Tx UE needs to send to the Rx UE, and after receiving the corresponding data, the Rx UE may feed back whether the transmission is successful or not to the Tx UE according to whether the demodulation is successful or not, for example: if the receiving is successful, feeding back ACK; otherwise, NACK feedback or no feedback is fed back, at this time, the Tx UE considers success if it receives ACK, and considers failure if it receives NACK or fails to receive feedback. And the Tx UE judges whether the Rx UE is successfully received or not according to the HARQ feedback of the Rx UE, if not, retransmission is needed, otherwise, the transmission is considered to be successful, and the transmission is stopped and/or the next transmission is carried out. The transmission reliability and the spectrum efficiency of the V2X can be improved by adding the HARQ feedback mechanism in the V2X.

Further, the SL in the current LTE V2X communication standard does not support switching of SL HARQ feedback either.

Although the SL uses HARQ feedback to effectively improve reliability and spectral efficiency, HARQ feedback is also deficient: for example, Rx UE needs to occupy extra feedback resources for HARQ ACK/NACK feedback, and especially when feedback channel load is high, all data transmission is required to perform HARQ feedback, which may cause an error rate to be too high when Tx UE demodulates ACK/NACK, resulting in erroneous determination. For another example, if the serving base station of the Tx UE needs to know the HARQ feedback result of the current transmission for the Tx UE being in the base station scheduling mode (LTE mode3 transmission mode), so as to allocate new transmission or retransmission resources to the Tx UE for the result, it also needs to consume additional Uu resources for feeding back the success/failure of SL data transmission. In addition, the feedback of ACK/NACK will also add additional feedback delay, which is disadvantageous for Ultra Reliable and Low Latency Communication (URLLC) traffic, and the ACK/NACK is meaningless.

Therefore, for the above reasons, the present application provides a HARQ feedback control method, which can autonomously configure the switch for SLHARQ feedback. Here, the SL HARQ feedback switch refers to a HARQ feedback switch for SL communication. The SL HARQ feedback switch comprises an on state and an off state, the SL HARQ feedback switch is on, namely the HARQ feedback is performed after the receiving terminal receives the SL data, and the SL HARQ feedback switch is off, namely the HARQ feedback is not required to be performed after the receiving terminal receives the SL data.

Regarding the configurator and the configurator of the SL HARQ feedback switch, the present application provides several applicable application scenarios, see five scenarios in fig. 3A to 3E, it should be noted that, besides the scenarios in fig. 3A to 3E, other application scenarios related to SL HARQ configuration in the SL data transmission process between the terminal and the terminal are also applicable in the present application, and are not described again here.

Illustratively, the scenario in fig. 3A is that the network device configures HARQ configuration information for a UE (or a UE group), where the HARQ configuration information is used to indicate a HARQ feedback switch for SL data. Optionally, the UE (or UE group) may configure/reconfigure/forward to other UEs (or UE groups) or network devices after receiving the configuration information. For example, the network device configures the UE1 with the UE1 configured for the UE2, or the network device configures the UE1 with the UE1 forwarding the configuration to the UE 2. Illustratively, the network device may be a serving gbb/Cell/CN/MME/AMF/V2X CF/GW/RSU/OAM/APP server/third party network element, etc. of the UE 1.

The scenario of fig. 3B is that UE1 configures UE2 with HARQ configuration information, and optionally UE2 may configure/reconfigure/forward to other UEs (or groups of UEs) or network devices after receiving the HARQ configuration information. For example, UE1 is Tx UE and UE2 is Rx UE, or UE1 is Rx UE and UE2 is TxUE. Illustratively, the network device may be a serving gbb/Cell/CN/MME/AMF/V2X CF/GW/RSU/OAM/APPserver/third party network element, etc. of the UE 2.

The scenario of fig. 3C is that UE1 configures HARQ configuration information for a group of UEs (for multicast and broadcast communications, the configuration may be sent using unicast/multicast/broadcast signaling), and the UEs in an optional group may be configured/reconfigured/forwarded to other UEs (or groups of UEs) or network devices after receiving the configuration information. In the case of multicast/broadcast, the number of configured parties of the SL HARQ feedback switch is plural.

The scenario of fig. 3D is that UE1 configures UE2 with HARQ configuration information, which is forwarded to UE2 via network device 1 and network device 2.

The scenario of fig. 3E is that the network device configures HARQ configuration information for UE1 and UE2, respectively. For example, UE1 is a Tx UE and UE2 is an Rx UE, or UE1 is an Rx UE and UE2 is a Tx UE. Fig. 3E illustrates that the UE1 and the UE2 are located in the same network device, and if the UE1 and the UE2 are located in different network devices, the network devices connected to the UE1 and the UE2 configure HARQ configuration information for the network devices.

The HARQ configuration information may also be forwarded by the configurator to the configurator through a plurality of third party devices. The third party device may comprise all other entities than the measurement event configurator/configurator.

It should be noted that the format of the SL HARQ feedback referred to in this application may be ACK (reception success) or NACK (reception failure) fed back by the physical layer. The SL HARQ feedback mode may also be a Scheduling Request (SR), where an ACK has an SR of a corresponding type, and a NACK also has an SR of a corresponding type, and whether the feedback is specifically an ACK or a NACK may be distinguished according to the type of the SR. The SL HARQ feedback mode may also be a Buffer Status Report (BSR) that distinguishes whether ACK (successful reception) or NACK (failed reception) through 1-bit indication, or a Physical Random Access Channel (PRACH) that distinguishes whether ACK (successful reception) or NACK (failed reception) through different time-frequency domain positions. The SL HARQ feedback can be fed back to the terminal equipment through an SL interface, and can also be fed back to the network equipment through a Uu interface. SL HARQ feedback refers to feedback for received SL data.

The format of Uu HARQ feedback referred to in this application may be ACK (reception success) or NACK (reception failure) of physical layer feedback. The format of the Uu HARQ feedback may also be SR, BSR or PRACH. The Uu HARQ feedback can be fed back to the network device through the Uu port, and can also be fed back to the terminal device through the Uu port. Uu HARQ feedback refers to feedback for received Uu data.

A flowchart of the HARQ feedback control method according to the present application will be described below with respect to the foregoing communication system and various application scenarios, and referring to fig. 4, the method includes the following steps S401 to S403. The details will be described below.

S401: the first terminal device (UE1) acquires the first HARQ configuration information.

S402: the first terminal device sends first HARQ configuration information to a second terminal device (UE2), and the second terminal device receives the first HARQ configuration information sent by the first terminal device, wherein the first HARQ configuration information comprises first indication information indicating whether the second terminal device carries out HARQ feedback for SL data.

S403: if the first indication information indicates that the second terminal device performs HARQ feedback for the SL data, the second terminal device needs to perform HARQ feedback after receiving the SL data. If the first indication information indicates that the second terminal device does not perform HARQ feedback for the SL data, the second terminal device does not need to perform HARQ feedback after receiving the SL data.

That is, the first indication information is used to indicate whether the SL HARQ feedback switch of the second terminal device is on or off, or to indicate whether the SL HARQ feedback switch of the second terminal device is on or off. If the first indication information indicates that the SL HARQ feedback switch of the second terminal device is on, the second terminal device needs to perform HARQ feedback after receiving the SL data. If the first indication information indicates that the SL HARQ feedback switch of the second terminal device is off, the second terminal device does not need to perform HARQ feedback after receiving the SL data.

Optionally, the embodiment of the present invention is applicable to the application scenario shown in fig. 3A, that is, the network device configures HARQ configuration information for the second terminal device, and the first terminal device forwards the HARQ configuration information. In this case, the first terminal device obtains the first HARQ configuration information, specifically: the network equipment sends the first HARQ configuration information to the first terminal equipment, and the first terminal equipment receives the first HARQ configuration information sent by the network equipment and sends the first HARQ configuration information to the second terminal equipment. The first terminal device may carry the first HARQ configuration information in Sidelink Control Information (SCI) and send the first HARQ configuration information to the second terminal device.

Optionally, the embodiment of the present invention is also applicable to the application scenario shown in fig. 3B, that is, the first terminal device configures HARQ configuration information for the second terminal device. In this case, the first terminal device obtains the first HARQ configuration information, specifically: the first terminal device generates first HARQ configuration information. The first terminal device may carry the first HARQ configuration information in the SCI and send the first HARQ configuration information to the second terminal device.

Optionally, the embodiment of the present invention is also applicable to the application scenario shown in fig. 3C, that is, the first terminal device configures HARQ configuration information for a plurality of second terminal devices (UE groups). In this case, the first terminal device obtains the first HARQ configuration information, specifically: the first terminal device generates first HARQ configuration information.

Optionally, the embodiment of the present invention is also applicable to the application scenario shown in fig. 3D, that is, the first terminal device configures HARQ configuration information for the second terminal device, and forwards the HARQ configuration information through the network device. In this case, the sending, by the first terminal device, the first HARQ configuration information to the second terminal device specifically includes: the first terminal equipment sends the first HARQ configuration information to the network equipment, and the network equipment receives the first HARQ configuration information sent by the first terminal equipment and sends the first HARQ configuration information to the second terminal equipment.

Optionally, the first indication information may be indicated by a 1-bit field, for example, if the field value is 0, it indicates that the HARQ feedback switch is off, the second terminal device does not need to perform HARQ feedback after receiving the SL data, and if the field value is 1, it indicates that the HARQ feedback switch is on, the second terminal device needs to perform HARQ feedback after receiving the SL data.

Optionally, the SL HARQ feedback switch of the second terminal device may be constrained by various conditions/granularity/scene/object/situation, that is, the SL HARQ feedback switch may increase an applicable condition/granularity/scene/object/situation, and the HARQ feedback switch is only used/applicable/applied/valid for a specific condition/granularity/scene/object/situation. Various suitable objects are described below.

For example, the feedback interface applicable to the SL HARQ feedback switch may include an SL interface or a Uu air interface. That is, if the first indication information indicates that the second terminal device performs HARQ feedback for SL data, after receiving the SL data, the second terminal device may feed HARQ back to the Tx UE through the SL interface, or may directly feed HARQ back to the network device through the Uu interface, and the network device determines whether to allocate resources for retransmitting data to the Tx UE according to HARQ fed back by the Rx UE. The feedback interface applicable to the SL HARQ feedback switch, specifically, whether the feedback interface is the SL interface or the Uu air interface, may be configured by the first terminal device or another device (e.g., a network device) to the second terminal device, or may be predefined by a protocol.

Optionally, the service type applicable/targeted by the SL HARQ feedback switch may include one or more of unicast, multicast, or broadcast, that is, the above-mentioned SLHARQ is applicable only when the SL data includes data of one or more service types of unicast, multicast, or broadcast. For example, the service type applicable to the HARQ feedback switch is only for unicast service, and then the second terminal device performs HARQ feedback according to the HARQ feedback switch only for SL data of the unicast service type. For another example, the service types applicable to the HARQ feedback switch include multicast and broadcast services, and then the second terminal device performs HARQ feedback according to the HARQ feedback switch only for SL data of the multicast and broadcast service types. The service types applicable to the HARQ feedback switch may be specifically configured by the first terminal device or other devices (e.g., network devices) to the second terminal device, or may be predefined by a protocol.

Optionally, the data transmission unit to which the SL HARQ feedback switch is applied/is a Transport Block (TB) of the MAC layer and/or a Code Block Group (CBG) of the physical layer. That is, the protocol layer to which the SLHARQ feedback switch is applied/directed includes a MAC layer and/or a physical layer. The data transmission unit of the MAC layer is TB, and the data transmission unit of the physical layer is CBG. For example, the data transmission unit applicable to the SL HARQ feedback switch is the MAC layer TB, and then the second terminal device performs HARQ feedback according to the HARQ feedback switch for the TB packet on the SL. For another example, if the protocol layer applied by the SL HARQ feedback switch is CBG of the physical layer, the second terminal device performs HARQ feedback on the CBG packet on the SL according to the SL HARQ feedback switch. The data transmission unit, specifically TB or CBG, applicable to the HARQ feedback switch may be configured by the first terminal device or other devices (e.g., network devices) to the second terminal device, or may be predefined by a protocol.

Optionally, the resource allocation mode applicable/targeted by the SL HARQ feedback switch includes a scheduling-free grant mode, a dynamic scheduling mode, a semi-static scheduling mode, or a UE autonomous contention mode. For example, the resource allocation mode applicable to the SL HARQ feedback switch is the dynamic scheduling mode, and only when the first terminal device (e.g., Tx UE) is in the dynamic scheduling mode, the second terminal device (e.g., Rx UE) performs HARQ feedback on data transmitted on the SL according to the HARQ feedback switch. The resource allocation mode, such as a base station scheduling mode, a UE autonomous contention mode, an LTE mode3, an LTE mode4, an NR mode1, or an NRmode2, to which the SL HARQ feedback switch is applicable, may be carried in the first HARQ configuration information, or agreed in a protocol, to indicate which resource allocation mode the SL HARQ feedback switch is specifically applicable/for.

Optionally, the case that the SL HARQ feedback switch is applicable may further include: the SL data is data transmitted using a preset/specified/specific Radio Access Network (RAN), and then the second terminal device performs HARQ feedback on the received data transmitted using the specific RAN according to the HARQ feedback switch. The specific RAN includes, but is not limited to, 4G or 5G, etc. The Identification (ID) of the specific RAN (or RAN list) may be carried in the first HARQ configuration information or agreed in the protocol. And the second terminal equipment performs HARQ feedback according to the HARQ feedback switch when receiving the SL data transmitted by using the specific RAN.

Optionally, the conditions applicable to the SL HARQ feedback switch may further include: SL data is data transmitted using a preset/designated/specific carrier/frequency (frequency), and the second terminal device performs HARQ feedback according to the HARQ feedback switch for the received data transmitted using the specific carrier/frequency. The identification of the specific carrier/frequency (or carrier list, frequency list) may be carried in the first HARQ configuration information or agreed in the protocol.

Optionally, the conditions applicable to the SL HARQ feedback switch may further include: the second terminal device is located at a pre-set/designated/specific base station/cell. The identity of the specific base station/cell (or base station/cell list) may be carried in the first HARQ configuration information or agreed in the protocol. And if the second terminal equipment is located in the preset/appointed/specific base station/cell, the second terminal equipment performs HARQ feedback according to the HARQ feedback switch aiming at the SL data.

Optionally, the conditions applicable to the SL HARQ feedback switch may further include: the first terminal device is located at a pre-set/designated/specific base station/cell. The identity of the specific base station/cell (or base station/cell list) may be carried in the first HARQ configuration information or agreed in the protocol. And if the second terminal equipment is located in the preset/appointed/specific base station/cell, the second terminal equipment performs HARQ feedback according to the HARQ feedback switch aiming at the SL data.

Optionally, the conditions applicable to the SL HARQ feedback switch may further include: the second terminal device is located in the same base station/cell as the first terminal device. And if the second terminal equipment and the first terminal equipment are positioned in the same base station/cell, the second terminal equipment performs HARQ feedback according to the HARQ feedback switch aiming at the SL data.

Optionally, the conditions applicable to the SL HARQ feedback switch may further include: the first terminal device is a preset/specified/specific source terminal (for the case that the first terminal device is Tx UE and the second terminal device is Rx UE). The identifier of the preset source terminal (or list) may be carried in the first HARQ configuration information, or agreed in the protocol. If the Tx UE is a preset source terminal, the Rx UE performs HARQ feedback on SL data sent by the Tx UE according to the HARQ feedback switch. The UE identity may include UE SL L2Id/address, UE SL L1Id/address, or a cell radio network temporary identity (C-RNTI), or an International Mobile Subscriber Identity (IMSI), or a Temporary Mobile Subscriber Identity (TMSI).

Optionally, the conditions applicable to the SL HARQ feedback switch may further include: the second terminal device is a preset target terminal (for the case that the first terminal device is Tx UE, and the second terminal device is Rx UE). The preset identifier of the target terminal (or list) may be carried in the first HARQ configuration information, or agreed in the protocol. And if the Rx UE is the preset target terminal, the Rx UE carries out HARQ feedback on SL data sent by the Tx UE according to the HARQ feedback switch. The UE identity may include UE SL L2Id/address, UE SL L1Id/address, or a cell radio network temporary identity (C-RNTI), or an International Mobile Subscriber Identity (IMSI), or a Temporary Mobile Subscriber Identity (TMSI).

Optionally, the conditions applicable to the SL HARQ feedback switch may further include: the second terminal device is a preset source terminal (for the case that the first terminal device is Rx UE and the second terminal device is Tx UE).

Optionally, the conditions applicable to the SL HARQ feedback switch may further include: the first terminal device is a preset/specified/specific target terminal (for the case that the first terminal device is Rx UE and the second terminal device is Tx UE).

Optionally, the conditions applicable to the SL HARQ feedback switch may further include: the second terminal device is one or more of a terminal included in a preset group, SL data is data corresponding to a preset service (service), SL data is data satisfying a preset quality of service (QoS), SL data is data transmitted using a preset carrier bandwidth part (BWP), SL data is data transmitted using a preset Logical Channel Group (LCG), SL data is data transmitted using a preset Logical Channel (LCH), SL data is data transmitted using a preset communication connection, SL data is data transmitted using a preset group connection, or SL data is data corresponding to a preset HARQ process(s). When one or more of the conditions are met, the second terminal equipment performs HARQ feedback according to the HARQ feedback switch for the SL data sent by the first terminal equipment. The conditions applicable to the SL HARQ feedback switch specifically include which one or more of the above may be configured by the first terminal device, and may also be defined in a protocol in advance, and the embodiment of the present invention is not limited. The identifier of the preset group (group), the identifier of the preset service (or list), the identifier of the preset QoS, the identifier of the preset bwp (list), the identifier of the preset lcg (list), the identifier of the preset lch (list), the identifier of the preset communication connection (such as connectionid (list)), the identifier of the preset group connection (such as groupconnection Id (list)), and the identifier of the preset HARQ process may be carried in the first HARQ configuration information, or agreed in the protocol. Illustratively, the QoS identifier may include a proximity packet priority (PPPP) identifier, a proximity packet reliability (PPPR) identifier, a quality of service Flow identifier (QFI), a vehicle communication quality of service identifier (VQI), a 5QI, a QoS Flow (Flow) identifier, a PC5 interface quality of service identifier (PC5 QoS identifier, PQI), and the like. The preset Group ID may be Group SL 2/L1 Id.

Optionally, the SL HARQ feedback switch may be a conditional switch (conditional switch) or an unconditional switch (unconditional switch). A condition switch: i.e. the switch is applied when certain enabling conditions are fulfilled. An unconditional switch: the configuration is effective and does not need to be switched on or off according to whether the condition is met. If the first HARQ configuration information is a conditional switch, the first HARQ configuration information further includes enabling condition information, and the enabling condition information is used for indicating enabling conditions of the SL HARQ feedback switch. In this case, the second terminal device enables HARQ feedback for SL data when the enabling condition of the SL HARQ feedback switch is satisfied, and does not enable HARQ feedback for SL data when the enabling condition of the SL HARQ feedback switch is not satisfied.

Optionally, the SL HARQ feedback switch may indicate explicitly or implicitly. The explicit indication is that the first HARQ configuration information includes an on/off indication of the SL HARQ, for example, on or off. If the SL HARQ switch is on, the first HARQ configuration information may further include an enabling condition of the SL HARQ feedback switch, and when the enabling condition is satisfied, the second terminal device enables HARQ feedback for SL data. The implicit indication means that if the first HARQ configuration information includes the enabling condition of the SL HARQ feedback switch, the default SL HARQ feedback switch is on, the first HARQ configuration information does not need to indicate that the SL HARQ feedback switch is on through a field, and then the second terminal device enables HARQ feedback for SL data when the enabling condition of the feedback switch is met. For another example, if the UE1 does not carry feedback resources for SL HARQ feedback in the SCI of the UE2, the SL HARQ feedback switch may be considered off, that is, HARQ feedback for SL data is not required.

Optionally, the enabling condition information includes that the preset measurement indicator is higher than, lower than, not higher than, or not lower than a preset threshold, and/or the preset measurement indicator is in or not in a preset value list. For different measurement indexes, the enabling conditions and the threshold values may be different. Specifically, which of the multiple enabling conditions may be indicated by the first HARQ configuration information, or may be predefined by a protocol. For example, if the measurement indicator is a Channel Busy Ratio (CBR), the enabling condition may be SL CBR < a first threshold, if the measurement indicator is a Reference Signal Received Power (RSRP), the enabling condition may be SL RSRP > a second threshold, and if the measurement indicator is a Modulation and Coding Scheme (MCS), the enabling condition may be whether the SL MCS value is in a preset list. The enabling condition information may include a measurement indicator, a determination condition (above a preset threshold, below the preset threshold, not above the preset threshold, not below the preset threshold, in or out of the preset value list), and a preset threshold/preset value list. Of course, the measurement indicator and the determination condition may be well defined by a protocol, and the enabling condition information only needs to include a preset threshold/preset value list. Or, the measurement indicator may be defined by a protocol, and the enabling condition information only needs to include a judgment condition and a preset threshold/preset value list. The enabling condition information may be predefined in a protocol or configured/forwarded by the first terminal device to the second terminal device.

Optionally, the measurement object corresponding to the preset measurement indicator includes one or more of a frequency point/resource pool/carrier bandwidth part (BWP) to be measured at the SL, a reference signal to be measured at the SL, and resource configuration information. Illustratively, the reference signal includes a Synchronization Signal Block (SSB), a channel state information reference signal (CSI-RS), a demodulation reference signal (DMRS), a Phase Tracking Reference Signal (PTRS), or a channel Sounding Reference Signal (SRS), and the resource configuration information includes any combination of time domain, frequency domain, or spatial domain.

Optionally, the conditions/scenarios/granularities applicable to the measurement object include: the first terminal device is in a scheduling grant free mode (i.e. when the UE1 is in the NR mode1, the measurement object is applied), the first terminal device is in a dynamic scheduling mode (i.e. when the UE1 is in the dynamic scheduling mode, e.g. LTE mode3 or NR mode1, the measurement object is applied), the first terminal device is in a semi-static scheduling mode (i.e. when the UE1 is in LTE mode3, the measurement object is applied), the first terminal device is in an autonomous contention mode (i.e. when the UE1 is in LTE mode4 or NR mode2, the measurement object is applied), the SL data is data transmitted using a preset RAN (i.e. when the UE1 and the UE2 transmit SL data using a preset RAN, the measurement object is applied), the SL data is data transmitted using a preset carrier (i.e. when the UE1 and the UE2 transmit SL data using a preset carrier), the SL data is data transmitted using a preset frequency (i.e. when the UE1 and the UE2 transmit SL data using a preset frequency, the measurement object is applicable), the first terminal device is located in a preset base station (i.e. when the UE1 is located in the preset base station, the measurement object is applicable), the first terminal device is located in a preset cell (i.e. when the UE1 is located in the preset cell, the measurement object is applicable), the second terminal device is located in a preset base station (i.e. when the UE2 is located in the preset base station, the measurement object is applicable), the second terminal device is located in a preset cell (i.e. when the UE2 is located in the preset cell, the measurement object is applicable), the first terminal device and the second terminal device are located in the same base station/cell (i.e. when the UE1 and the UE2 are located in the same base station/cell, the measurement object is applicable), the first terminal device is a preset source terminal (i.e. when the UE1 is a preset terminal, the measurement object is applicable), the second terminal device is a preset target terminal (i.e. when the UE2, the measurement object is applied), the second terminal device is a terminal included in a preset group (that is, when the UE2 is a terminal included in the preset group, the measurement object is applied), the SL data is data corresponding to a preset service (that is, when the UE1 and the UE2 transmit preset SL service data, the measurement object is applied), the SL data is data satisfying a preset service quality (that is, when the UE1 and the UE2 transmit SL data satisfying a preset service quality requirement, the measurement object is applied), the SL data is data transmitted by using a preset BWP (that is, when the UE1 and the UE2 transmit SL data by using a preset BWP, the measurement object is applied), the SL data is data transmitted by using a preset logical channel group (that is, when the UE1 and the UE2 transmit SL data by using a preset logical channel group, the measurement object is applied), the SL data is data transmitted by using a preset logical channel (that is, when the UE1 and the UE2 transmit SL data by using a preset logical channel, the measurement object is applied), SL data is data transmitted using a predetermined communication connection (i.e., when the UE1 and the UE2 transmit SL data using a predetermined communication connection, the measurement object is applied), or SL data is data transmitted using a predetermined group connection (i.e., when the UE1 and the UE2 transmit SL data using a predetermined group connection, the measurement object is applied).

Optionally, the preset measurement indicator includes any one or more combinations of channel quality corresponding to the SL interface, quality of service (QoS) corresponding to the SL interface, or a sending indicator corresponding to the SL interface. Illustratively, the channel quality corresponding to the SL interface includes one or more of CBR, RSRP, Reference Signal Received Quality (RSRQ), Received Signal Strength Indicator (RSSI), Channel Quality Indicator (CQI), Channel State Information (CSI), Precoding Matrix Indicator (PMI) in a Multiple Input Multiple Output (MIMO) system, RANK Indicator (RI) in a MIMO system, or RANK (k) of a channel matrix in a MIMO system. The QoS corresponding to the SL interface includes one or more of a QoS target, a QoS requirement, or a QoS value. The sending index corresponding to the SL interface includes one or more of transmission rate, path loss (PathLoss), Power Headroom Report (PHR), Timing Advance (TA), MCS, Power, or block error rate (BLER). The QoS value comprises delay, reliability, rate/throughput, communication distance or Payload.

For example, taking the granularity of the SL HARQ feedback switch configured by the Tx UE as the Rx UE as the traffic type specifically as an example, the first HARQ configuration information may be configured as: SL unicast TB HARQ switch: an unconditional switch is on; SL unicast CBG HARQ switch: unconditional switching, off; SL multicast TB HARQ switch: a condition switch, provided that CBR < Thr is on; SL multicast CBG HARQ switch: unconditional switch, on. After receiving the configuration information, the Rx UE may understand that the configuration information includes TBHARQ switches for all unicast connections on the SL link: unconditional switching, always on (i.e. feedback required); CBG HARQ switches for all unicast connections on SL link: unconditional switching, always off; TB HARQ switch for all multicast connections on SL link: a conditional switch that is turned on only when the Rx UE measures CBR to satisfy { CBR < Thr }; TB HARQ switch for all multicast connections on SL link: and the unconditional switch is always opened.

For another example, taking the granularity of the SL HARQ feedback switch configured by the Tx UE as the Rx UE, specifically, the SL unicast/multicast connection as an example, the first HARQ configuration information may be configured as: TB HARQ switch with SL Unicast connection Id ═ 1: an unconditional switch is on; CBG HARQ switch: unconditional switching, off; a TB HARQ switch of SL multicast group peer 2: a condition switch, on when condition { CBR < Thr }; CBG HARQ switch: unconditional switch, on. After receiving the configuration information, the Rx UE may understand that the TB HARQ switch connected to the SL unicast connection with the connection identifier 1 (the remaining unicast connections are not applicable): unconditional switching, always on (i.e. feedback required); CBG HARQ switch connected to the SL unicast connection with identification 1: unconditional switching, always off; TB HARQ switch for this SL multicast communication (the rest of multicast communication is not applicable) with group identification 2: a conditional switch that is turned on only when the Rx UE measures CBR to satisfy { CBR < Thr }; CBG HARQ switch for this SL multicast communication with group identification 2: and the unconditional switch is always opened.

Optionally, the first terminal device is a Tx UE, and the second terminal device is an Rx UE. Or, the first terminal device is an RxUE, and the second terminal device is a Tx UE. Alternatively, the first terminal device is UE1 and the second terminal device is UE 2. Alternatively, the first terminal device is UE1 and the second terminal device is group UEs.

In the case of unicast, the number of configured parties of the SL HARQ feedback switch is one.

In the case of multicast/broadcast, the number of configured parties of the SL HARQ feedback switch is plural.

Optionally, the configuration information of the SL HARQ feedback switch may be sent/forwarded through one of a high layer signaling or a bottom layer signaling. This case may configure the SL HARQ feedback switch for a period of time/period, which configuration is applied until the next signaling reconfiguration/modification/release etc. For example, if the configuration information of the SL HARQ feedback switch is sent/forwarded to the UE2 by the UE1, the Signaling may include PC5 interface Signaling (PC5Signaling, PC5-S) Signaling, Radio Resource Control (RRC) Signaling, System Information Block (SIB) Signaling, Service Data Adaptation Protocol (SDAP) Signaling, data convergence protocol (PDCP) Signaling, Radio Link Control (RLC) Signaling, SCI Signaling, MAC (MAC control element, CE) Signaling, and the like. If the configuration information of the HARQ feedback switch is transmitted/forwarded to the UE by the base station, the signaling may include NAS signaling, RRC signaling, SIB signaling, SDAP signaling, PDCP signaling, RLC signaling, mac (mac ce) signaling, DCI signaling, and the like.

Optionally, the configuration information of the SL HARQ feedback switch may be sent through a combination of signaling of each layer. The configuration of the SL HARQ feedback switch is performed, for example, by one signaling, and the switch configuration is (de) activated by another signaling, for example, by RRC configuration + MAC/DCI (de) activation. In this case, the UE does not apply the configuration information of the SL HARQ feedback switch carried by the RRC signaling after receiving the configuration information, and needs to wait for receiving the activation signaling before applying the configuration of the SL HARQ feedback switch.

Optionally, the configuration information of the SL HARQ feedback switch may be sent in any one or more unicast/multicast/broadcast manners.

Optionally, when the UE2 receives the HARQ configuration information sent by the UE1, a response message may be sent to the UE1, where the response message may indicate success, failure/rejection of the configuration, or partial success/failure/rejection and specific success/failure/rejection reasons). Optionally, the response message may be sent through a direct link, or may be sent through a forwarding manner. Optionally, the response may be a response to the configuration or a response to the (de) activation message.

Optionally, for a scenario in which the UE1 configures the SL HARQ feedback switch for the UE2, the UE2 state may be: Connected/Active Connected state, idle state, Inactive state, out of coverage (OOC) state, etc. And where multiple UE entities are referred to above, the state of each UE may be in any combination. And aiming at the scene that the network equipment configures the SL HARQ feedback switch for the UE, the UE is in an Active state.

Optionally, if the SL HARQ feedback switch of the second terminal device is a conditional switch, when the state of the SL HARQ feedback switch changes (for example, the SL HARQ feedback switch changes from on to off, or from off to on), the second terminal device sends change instruction information to the first terminal device, and the first terminal device receives the change instruction information sent by the second terminal device, where the change instruction information is used to instruct the second terminal device whether to perform SL HARQ feedback. So that the first terminal device knows whether the second terminal device of the opposite terminal will perform the SL HARQ feedback. Optionally, the first terminal device may further notify the network device of an event that the SL HARQ feedback state changes. For example, if the conditions of the SL HARQ feedback switch are switched from satisfied to unsatisfied (that is, the SL HARQ feedback switch is switched from on to off), the second terminal device sends change indication information to the first terminal device, where the change indication information indicates that the conditions of the SL HARQ feedback switch are not satisfied, and after receiving the change indication information, the first terminal device learns that the second terminal device does not perform SL HARQ feedback, and thus the second terminal device does not need to request the base station to allocate the SL HARQ feedback resource of the first terminal device, and the second terminal device does not need to wait for receiving ACK/NACK of the first terminal device, and does not need to determine whether to retransmit the SL HARQ feedback according to the ACK/NACK fed back by the first terminal device. For example, if the SL HARQ feedback switch of the first terminal device is changed from on to off and the second terminal device is not notified of the change, the second terminal device waits for receiving the ACK fed back by the second terminal device, and the second terminal device retransmits data to the first terminal device all the time when the ACK fed back by the second terminal device is not received, which results in waste of transmission resources.

If the conditions of the SL HARQ feedback switch are switched from being not satisfied to being satisfied (that is, the SL HARQ feedback switch is switched from off to on), the second terminal device sends change indication information to the first terminal device, the change indication information indicates that the conditions of the SL HARQ feedback switch are satisfied, and after receiving the change indication information, the first terminal device learns that the second terminal device will perform SLHARQ feedback, and needs to request the base station for the feedback resources of the SL HARQ of the second terminal device again. Or, if the SL HARQ feedback switch of the second terminal is a conditional switch, when the state of the SL HARQ feedback switch changes (for example, the SLHARQ feedback switch changes from on to off or from off to on), the second terminal transmits change instruction information to the network device, and the network device receives the change instruction information transmitted by the second terminal, where the change instruction information is used to instruct the second terminal whether to perform SL HARQ feedback. The network device is facilitated to confirm whether the SL HARQ feedback resource needs to be configured for the second terminal device. Referring to fig. 5, the second terminal device notifies the first terminal device when the state of the SL HARQ feedback switch of the second terminal device is changed. After step S403, the method further includes: s404: and when the SL HARQ feedback switch is changed, sending change instruction information, wherein the change instruction information is used for instructing the SL HARQ feedback switch of the second terminal equipment to be changed from on to off or from off to on.

Optionally, the first HARQ configuration information may be reconfigured by the first terminal device according to second HARQ configuration information, where the second HARQ configuration information is configured by the network device for the first terminal device, and the second HARQ configuration information includes second indication information indicating whether the first terminal device performs HARQ feedback for SL data. If the second indication information indicates that the first terminal device performs HARQ feedback for SL data (or the HARQ feedback switch is on, or the HARQ feedback switch is enabled), the HARQ feedback switch configured for the second terminal device by the first terminal device may also be on, and if the second indication information indicates that the first terminal device does not perform HARQ feedback for SL data (or the HARQ feedback switch is off ), the HARQ feedback switch configured for the second terminal device by the first terminal device may also be off.

Optionally, the various conditions/granularities/scenes/objects/conditions of the SL HARQ feedback switch of the first terminal device indicated by the second indication information may refer to the various conditions/granularities/scenes/objects/conditions of the SL HARQ feedback switch of the second terminal device indicated by the first indication information, which is not described again here.

Optionally, the second HARQ configuration information may further include third indication information used for indicating whether the first terminal device feeds back the SL HARQ fed back by the second terminal device to the network device through the Uu port. For example, when the UE1 is in the base station scheduling mode1, if the base station employs the dynamic scheduling mode, the UE1 first requests the SLGrant from the base station each time it transmits SL data, and the UE1 waits for HARQ feedback on the SL of the UE2 after transmitting SL data to the UE2 to determine whether SL data reception is successful, and if the UE2 feeds back NACK, the UE1 also needs to synchronously notify to its serving base station through Uu UL HARQ feedback after receiving NACK of the UE2, and then the base station allocates retransmission resources to the UE 1. And if the third indication information indicates that the first terminal equipment needs to feed back to the base station after receiving the SL HARQ feedback sent by the second terminal equipment, the first terminal equipment feeds back the feedback result of the SL HARQ to the base station through the Uu port after receiving the SLHARQ feedback sent by the second terminal equipment. If the UE1 is in the scheduling-free mode, after the UE1 receives the HARQ feedback of the UE2, the UE1 feeds back to its serving base station through the Uu UL, and the serving base station may optionally determine whether to reconfigure the resource allocation mode of the UE1 according to the feedback of the UE 1.

For a scenario that SL HARQ also needs to be fed back to the base station through the Uu port, the mapping relationship between the number of SL HARQ times and the Uu SL HARQ times may be: 1:1, N: 1. 1: n or M: N. In this case, the network device further needs to configure time-frequency domain relationship configuration of SL HARQ and Uu SL HARQ, for example, when the mapping relationship between the number of SL HARQ and Uu SL HARQ is 1:1, the network device further needs to configure that which SL HARQ feedback corresponds to which SL HARQ, and the correspondence may be uniquely indicated by a combination of time/frequency/code/space domain. If the mapping relationship between the number of SL HARQ and Uu SL HARQ is M: N, the network device further needs to configure which number of Uu SL HARQ feedbacks corresponds to which number of SL HARQ feedbacks and how to correspond, and the correspondence relationship can be uniquely indicated by a combination of time/frequency/code/space domain. Here, SL HARQ refers to HARQ feedback of the UE2 for SL data transmitted by the UE1, and Uu SL HARQ refers to feedback of a feedback result of SL HARQ to the base station through the Uu port after the UE1 receives HARQ fed back by the UE2 for SL data. The Uu SL HARQ is different from the Uu HARQ, and a Uu HARQ feedback switch in the following embodiments refers to whether the UE feeds back Uu data issued by the network device.

For example, taking the base station as the UE1 to configure the Uu SL HARQ and SL HARQ feedback switches at the same time, the configuration of the base station may be: uu SL HARQ feedback switch: an unconditional switch is on; position 1{ time domain information 1, frequency domain information 1, code domain information 1, space domain information 1} of ACK/NACK/SR/BSR/PRACH fed back by Uu SL HARQ; SL HARQ feedback switch: an unconditional switch is on; position 2{ time domain information 2, frequency domain information 2, code domain information 2, space domain information 2} of ACK/NACK/SR/BSR/PRACH fed back by SL HARQ; uu SL HARQ and SL HARQ number relationship: { Uu SL HARQ/SLHARQ } ═ 1: 1; uu SL HARQ and SLHARQ mapping { position 1, position 2 }. The UE1, upon receiving the above configuration, may understand: the HARQ switch of SL is unconditional and always on (i.e. feedback is required); when the UE1 is used as Tx UE to send data, it needs to feed back to the base station after receiving HARQ feedback of Rx UE; mapping relationship between Uu SL HARQ and SL HARQ: the time ratio is 1:1, and the position relationship is as follows: the Uu SL HARQ position is equal to position 1, the SL HARQ position is equal to position 2, position 1 is used for Rx UE to feed back SL HARQ, and Tx UE receives the feedback result of Rx UE fed back to the base station at position 2 after receiving the SL HARQ fed back by Rx UE.

Still taking the example that the base station configures the HARQ feedback switch for the UE1, the UE1 needs to apply the configuration after receiving the configuration of the base station, which is as follows:

the NAS/PC5-S/RRC/SDAP/PDCP/RLC/MAC/PHY layer of the UE1, upon receiving the configuration, forwards to the other NAS/PC5-S/RRC/SDAP/PDCP/RLC/MAC/PHY layers within the UE 1. Examples of processing uses of the specific layers after receiving the HARQ feedback switch configuration include, but are not limited to:

NAS/PC5-S/RRC/SDAP/PDCP/RLC layers: the TB level configuration and its application conditions (including the above granularity, indicators, conditions, condition thresholds, HARQ switch/condition switch, etc.) are forwarded/configured/reconfigured/(de) to the UE 2.

And a MAC layer: if the switch for TB HARQ is turned on, the UE1 determines the switch granularity, and if the switch granularity satisfies the corresponding granularity, the switch granularity is set to granularity 1: if the feedback switch is configured as a Uu HARQ (namely, data transmitted aiming at the Uu port), the feedback switch is applied to the Uu data; if the feedback switch is configured as an SL HARQ feedback switch, applying the SL data; if the mapping relation of the times and the time-frequency-space domain mapping relation of the Uu SL HARQ and the SL HARQ are configured at the same time, the method is applied at the same time, namely SL data needs to be fed back when being received, and meanwhile SL HARQ fed back by other terminals needs to be fed back to the base station after being received; for particle size 2: if the UE is configured as a Uu DL HARQ feedback switch, applying the Uu DL data; if the configuration is a Uu UL HARQ feedback switch, the UuUL data is applied, and if the configuration is carried out simultaneously, the UuUL data is applied simultaneously; for particle size 3: if the switch is configured as the switch of the Dynamic Grant of the Dynamic scheduling mode, applying the data transmitted by the Dynamic scheduling mode; if the mode is configured to be a scheduling-Free authorized mode configured to be a configured Grant Free/Grant Free switch, applying the data transmitted by the configured Grant Free/Grant Free; if the configuration is carried out simultaneously, the configuration is applied simultaneously; for particle size 4: if the TB-level HARQ feedback is configured to be opened, the TB-level HARQ feedback is carried out, otherwise, the TB-level HARQ feedback is closed; for particle size 5: if the configured granularity is applied when the data is sent, whether a data receiver feeds back or not can be indicated when the data is sent subsequently, if the configured granularity is applied when the data is received, TB level feedback is automatically carried out when the data is received subsequently, and if the granularity is configured simultaneously, the TB level feedback is applied simultaneously; for a particle size of 6: if the corresponding granularity is configured, the application is performed on the corresponding granularity, the TB level configuration is forwarded/configured/reconfigured/(de) activated to the UE2, and the TB level configuration is configured/(de) activated by means of MAC CE, MAC header, MAC data, and the like.

If the UE1 is in a base station scheduling mode (LTE SL mode3, NR SL mode1), when a resource BSR report/Traffic model report is requested from the base station, the current HARQ on/off state may be indicated; correspondingly, the base station can carry/not carry Uu and/or SL HARQ feedback resources in the scheduling resources (Dynamic Grant, configured Grant/Grant Free/SPS resources, etc.) allocated to the UE; if the UE is in autonomous contention mode (LTE SLmode4, NR SL mode2), it belongs to UE internal processing.

PHY layer: for a switch which is used for carrying out CBG HARQ, if the switch is turned on, the UE judges the switch granularity, and if the switch granularity meets the corresponding granularity, the switch granularity is determined as the granularity 1: if the Uu HARQ switch is configured, the Uu data is applied; if the configuration is an SL HARQ switch, applying the SL data; if the times mapping relation and the time-frequency space-domain mapping relation of the Uu SL HARQ and the SL HARQ are configured at the same time, the times mapping relation and the time-frequency space-domain mapping relation are applied at the same time; for particle size 2: if the UE is configured as a Uu DL HARQ feedback switch, applying the Uu DL data; if the configuration is a UuUL HARQ feedback switch, the Uu UL data is applied, and if the configuration is carried out simultaneously, the Uu UL data is applied simultaneously; for particle size 3: if the switch is configured as a switch of the dynamic scheduling mode, applying the data transmitted by the dynamic scheduling mode; if the mode is configured to be a scheduling-Free authorized mode configured to be a configured Grant Free/Grant Free switch, applying the data transmitted by the configured Grant Free/Grant Free; if the configuration is carried out simultaneously, the configuration is applied simultaneously; for particle size 4: if the CBG level HARQ feedback is configured to be opened, carrying out CBG level HARQ feedback, and if not, closing; for particle size 5: if the configured granularity is applied when the data is sent, whether a data receiver feeds back or not can be indicated when the data is sent subsequently, if the configured granularity is applied when the data is received, TB level feedback is automatically carried out when the data is received subsequently, and if the granularity is configured simultaneously, the TB level feedback is applied simultaneously; for a particle size of 6: if the corresponding granularity is configured, the application is performed on the corresponding granularity, the CBG level configuration is forwarded/configured/reconfigured/(de) activated to the UE2, and the CBG level configuration is configured/(de) activated by DCI, UCI, SCI, Data, and the like.

Optionally, referring to fig. 6, it is a schematic diagram of configuring an SL HARQ switch based on a measurement report according to an embodiment of the present invention. The SL HARQ feedback switch of the second terminal device may be determined based on the measurement report reported by the second terminal device. Exemplarily, before the first terminal device acquires the first HARQ configuration information, the method further includes: s405: the method comprises the steps that a first terminal device sends measurement configuration information of a measurement event to a second terminal device, the second terminal device receives the measurement configuration information of the measurement event sent by the first terminal device, and the measurement configuration information comprises at least one measurement object and a reporting configuration requirement corresponding to the measurement event; s406: the second terminal device measures at least one measurement object to obtain a first measurement value. S407: and when the first measurement value meets at least one of the reporting configuration requirements, the second terminal equipment sends a measurement report of the measurement event to the first terminal equipment, and the first terminal equipment receives the measurement report of the measurement event sent by the second terminal equipment to the first terminal equipment. The step S401 of acquiring, by the first terminal device, the first HARQ configuration information specifically includes: and the first terminal equipment generates first HARQ configuration information according to the measurement report. In this embodiment, the first terminal device configures measurement and configures the HARQ feedback switch for the second terminal device, and in other optional embodiments, the device configured with measurement and the device configured with the HARQ feedback switch may be the same or different.

For example, the network device configures measurement for the second terminal device, and sends the measurement to the second terminal device through the first terminal device, the second terminal device feeds back the measurement report to the first terminal device, and the first terminal device configures an HARQ feedback switch for the second terminal device. For another example, the serving base station of UE1 is gNB1, the serving base station of UE2 is gNB2, and SL communication is performed between UE1 and UE 2. The gNB1 makes a measurement configuration for UE1, and UE1 forwards/re-allocates the configuration to UE 2. After the UE2 performs measurement and meets the reporting condition, it may report a measurement report to the UE1, or report a measurement report to the gNB2, and the gNB2 directly transmits the measurement report to the gNB through an inter-base-station X2/Xn interface, or transmits the measurement report to the gNB1 through a relay manner such as CN network element/AMF network element/V2X CF network element/OAM network element. For another example, for group communication, a UE in the group (or a third party) triggers a configuration request to a Leader UE, and the Leader UE (or any number UE) configures measurement for a part of users in the group as needed. The configured party executes measurement, and when the reporting condition is met, the configured party reports a measurement report.

For example, taking the first terminal device as an example to configure the HARQ feedback switch for the second terminal device, if the measurement report satisfies the HARQ feedback switch enabling condition, the first terminal device configures the HARQ feedback switch for the second terminal device as on, and if the measurement report does not satisfy the HARQ feedback switch enabling condition, the first terminal device configures the HARQ feedback switch for the second terminal device as off.

For example, the measurement objects included in the measurement configuration information include a frequency point/resource pool/BWP to be measured at the SL, and reference signals to be measured at the SL, such as reference signals of SL SSB/SL CSI-RS, SL DMRS, SL PTRS, or SL SRS, and configuration information (e.g., time domain, frequency domain, and spatial domain).

The measurement events include Ax common-frequency measurement events, Bx pilot-frequency/inter-system measurement events, and SL interface measurement events Vx. Optionally, the measurement configuration information may further include a reporting mode of the measurement report, for example, the reporting of the measurement report may be event-triggered reporting, cycle-triggered reporting, or event-to-cycle reporting. Optionally, the measurement configuration information may further include the maximum reporting times, the reporting interval, and the like of the measurement report, or any combination thereof.

Optionally, the measurement indicator corresponding to the measurement event may include: CBR, RSRP, RSRQ, RSSI, CQI, CSI, PMI/RI/RANK in MIMO, QoS target/requirement/actual QoS value (such as latency delay, reliability of reliability, rate data rate/throughput, communication distance range, Payload, Tx rate (Message/Sec), etc.), PathLoss, PHR, TA, MCS, Power, BLER, etc. Uu similar indicators or any combination.

The reporting configuration requirement corresponding to the measurement event refers to a condition for reporting the measurement report, that is, when the first measurement value meets the reporting configuration requirement corresponding to the measurement event, the measurement report is reported. The reporting configuration requirement corresponding to the measurement event may be, for example, CBR < Thr1 or QoS > Thr2 or latency > Thr or QoS < Thr, etc.

Optionally, the conditions/granularities/conditions applicable to the measurement event include: the first terminal device is in a non-scheduling authorization mode (i.e., the first terminal device applies the measurement event when in the non-scheduling authorization mode), the first terminal device is in a dynamic scheduling mode (i.e., the first terminal device applies the measurement event when in the dynamic mode), the SL data is data transmitted using a predetermined radio access technology (i.e., the first terminal device applies the measurement event when transmitting the SL data to the second terminal device using a predetermined RAN), the SL data is data transmitted using a predetermined carrier (i.e., the first terminal device applies the measurement event when transmitting the SL data to the second terminal device using a predetermined carrier), the SL data is data transmitted using a predetermined frequency (i.e., the first terminal device applies the measurement event when transmitting the SL data to the second terminal device using a predetermined frequency), the second terminal device is located at a predetermined base station (i.e., the second terminal device applies the measurement event when located at the predetermined base station), and the SL data is transmitted using the predetermined frequency, The second terminal device is located in a preset cell (that is, the second terminal device is suitable for the measurement event when located in the preset cell), the first terminal device is a preset source terminal (that is, the measurement event is suitable when the first terminal device is a preset source terminal), the second terminal device is a preset target terminal (that is, the measurement event is suitable when the second terminal device is a preset target terminal), the second terminal device is a terminal included in a preset group (that is, the measurement event is suitable when the second terminal device is a terminal included in the preset group), the SL data is data corresponding to a preset service (that is, the measurement element is suitable when the first terminal device transmits SL data of a preset service to the second terminal device), the SL data is data satisfying a preset service quality (that is, the measurement event is suitable when the first terminal device transmits SL data satisfying the preset service quality to the second terminal device), and the SL data is obtained by performing the measurement when the SL data satisfies the preset service quality, The SL data is data transmitted using a predetermined carrier bandwidth part BWP (i.e., the measurement event is applied when the first terminal device transmits SL data to the second terminal device using the predetermined BWP), the SL data is data transmitted using a predetermined logical channel group (i.e., the measurement event is applied when the first terminal device transmits SL data to the second terminal device using the predetermined logical channel group), the SL data is data transmitted using a predetermined logical channel (i.e., the measurement event is applied when the first terminal device transmits SL data to the second terminal device using the predetermined logical channel), the SL data is data transmitted using a predetermined communication connection (i.e., the measurement event is applied when the first terminal device transmits SL data to the second terminal device using the predetermined communication connection), and the SL data is data transmitted using a predetermined group connection (i.e., the measurement event is applied when the first terminal device transmits SL data to the second terminal device using the predetermined group connection) One or more of (a). The identifier of the preset RAN, the preset carrier, the preset frequency, the preset base station, the preset cell, the preset terminal, and the like may be configured by the first terminal device to the second terminal device, or may be defined by a protocol, which is not limited in the embodiment of the present invention. Illustratively, the UE identity may include UE SL 2Id/address, UE SL 1Id/address, or cell radio network temporary identity (C-RNTI), or International Mobile Subscriber Identity (IMSI), or Temporary Mobile Subscriber Identity (TMSI).

To illustrate with an example of a CSI-RS based measurement configuration, for a certain group communication, the UE1 configures measurement for all/part of other users (e.g., UE2, UE3, and UE4) in the group, which is assumed to be measurement event 1. The measurement object corresponding to the exemplary measurement event 1 is configured to measure a reference signal, and includes time-frequency-space domain information. The reporting configuration corresponding to the measurement event 1 is configured to be that when the measured SL CSI-RS > Thr1, the reporting condition is considered to be satisfied, and the measurement report is triggered to be reported. The reporting mode of the measurement report corresponding to the measurement event 1 is configured with an event transfer period, a maximum reporting frequency of 10 times and a reporting period of 10 ms. When Rx UE (e.g., UE2) receives the measurement configuration and measures RSRP > Thr1 of SL CSI-RS, it reports the measurement report corresponding to measurement event 1 after the condition is met. Which information specifically needs to be reported by the measurement report corresponding to the measurement event 1 may also be configured by the UE 1.

For another example, to illustrate the QoS-based measurement configuration, it is assumed that measurement event 2 is configured for all/some other users (e.g., UE2, UE3, and UE4) in a group communication by UE 1. An exemplary measurement indicator corresponding to the measurement event 2 is latency, the granularity of the measurement event 2 is SL data corresponding to serviceId ═ 2, and the reporting condition corresponding to the measurement event 2 is that the reporting is triggered when the SL latency >3 ms.

For another example, the UE1 is in NR SL mode1 connected state, when the UE1 is in base station scheduling mode, so the serving base station of the UE needs to sense whether the HARQ feedback switch is enabled, so the UE1 can be configured with measurements by the base station/cell, and the UE1 can forward/configure/re-configure the configuration to the UE 2. Reporting, by the UE1/UE2, the measurement report meeting the condition to the base station and triggering the base station to configure the HARQ feedback switch (e.g., configured to on or off, or enabled or turned off) for the UE 1. The optional UE1 may forward/configure/re-configure the configuration result of the base station to the UE 2. If currently configured on, the base station needs to carry resources (e.g., carried on the PSFCH) for SL HARQ feedback when allocating transmission resources to the UE 1. If the current configuration is off, the base station need not carry resources (e.g., carried on the PSFCH) for SL HARQ feedback when allocating transmission resources to the UE 1. In this case, the configurator is the base station and the receiver is UE1, if UE1 needs to be forwarded/configured to UE2, then UE1 is the forwarder/configurator and UE2 is the receiver.

Optionally, the following description is directed to the configurator of the measurement configuration and the entities that the configurator may include. In the first case, taking 2 communication parties in unicast communication and a base station served by the communication parties as examples, the devices possibly involved include: UE1, UE2, serving gbb of UE1, serving gbb of UE 2.

The configurator/sender of the measurement event may include: UE1, serving gNB/Cell/CN/MME/AMF/V2XCF/GW/RSU/OAM/APP server/third party network element of UE1, etc.

The configurator/recipient of the measurement event may include: UE 2.

Alternatively, the configuration of the measurement event may also be forwarded by a third party device to the configurator/receiver, which may include all other entities except the measurement event configurator/configurator.

Likewise, the sender of the measurement report is UE 2.

The receiver of the measurement report may include: UE1, serving gNB/Cell/CN/MME/AMF/V2X CF/GW/RSU/OAM/APP server/third party network element of UE1, etc.

The measurement configuration/measurement report reception and the like may be directly configured/sent to the UE2 by the serving gbb of the UE1/UE1, or configured/sent in a relay manner by the UE/gbb/Cell/RSU/CN/MME/AMF/V2X CF/SGW/RSU/OAM/APP server/third-party network element and the like, which is not limited in the embodiment of the present invention. The receiver of the measurement report may be the configurator of the measurement event, or any third party.

Optionally, the measurement configuration may be configured by the configurator to the configured party actively, or may be configured by the configured party sending a configuration request to the configurator first and then configuring by the configurator, or may be configured by the configurator to the configuring party requested by a third party and then configuring by the configurator.

In the second case, for example, for group/broadcast communication, the entities/entities list that may be involved include: UE1, UE2(list), and service gNB/Cell/RSU/CN/MME/AMF/V2X CF/SGW/RSU/OAM/APPServer/third party network element corresponding to the above various UEs.

The configurator/sender of the measurement event may be: the combination of UE1, serving gNB/Cell/RSU/CN/MME/AMF/V2X CF/SGW/RSU/OAM/APP server/third party network element of UE1, and the like, and any combination of various entities list.

The configurator/recipient of the measurement event may include: UE2 (list).

Optionally, the configuration of the measurement event may also be forwarded to the configured party/recipient by a third-party device, which may include: all other entities or entity list except the measurement event configurator/configurator.

The sender of the measurement report may be UE2 (list).

The receiver of the measurement report may include: the combination of UE1, serving gNB/Cell/RSU/CN/MME/AMF/V2X CF/SGW/RSU/OAM/APP server/third party network element of UE1, and the like, and any combination of various entities list.

It should be noted that, the above is only exemplified by the possibility of the entity devices respectively related to the configurator of the measurement event, the sender of the measurement report, and the receiver of the measurement report, and in practical applications, each entity may be configured according to actual situations, for example, the configurator of the measurement event and the receiver of the measurement report are Tx UEs, and the configurator of the measurement event and the sender of the measurement report are Rx UEs. Tx UE configures measurement for Rx UE, Rx UE performs measurement, and after a reporting condition is met, the Tx UE feeds back a measurement report to the Tx UE, and the Tx UE configures an HARQ feedback switch for the Rx UE based on the measurement report fed back by the Rx UE. For another example, the configurator of the measurement event and the receiver of the measurement report are base stations, and the configurator of the measurement event and the transmitter of the measurement report are Rx UEs.

Optionally, the measurement configuration information may be sent/forwarded through one of a higher layer signaling or a lower layer signaling. This case may configure the measurement configuration over a period of time/period, which configuration is applied until the next signaling reconfiguration/modification/release etc. For example, if the measurement configuration information is sent/forwarded by the UE1 to the UE2, the higher layer signaling may include PC5-S signaling, RRC signaling, SIB signaling, SDAP signaling, PDCP signaling, RLC signaling, mac (mac ce) signaling, etc. If the measurement configuration information is transmitted/forwarded to the UE by the base station, the higher layer signaling may include NAS signaling, RRC signaling, SIB signaling, SDAP signaling, PDCP signaling, RLC signaling, mac (mac ce) signaling, and the like. If the measurement configuration information is sent/forwarded to the UE2 by the UE1, the underlying signaling includes MAC signaling, SCI signaling, and the like. If the measurement configuration information is sent/forwarded to the UE by the base station, the bottom layer signaling includes MAC signaling, DCI signaling, and the like.

Optionally, the measurement configuration information may be sent through a combination of signaling of each layer. The measurement configuration is e.g. performed by one signalling and activated by another signalling, e.g. RRC configuration + MAC/DCI (de) activation. In this case, the UE does not apply the measurement configuration after receiving the measurement configuration information carried in the RRC signaling, and needs to wait for receiving the activation signaling before applying the measurement configuration.

Optionally, the measurement configuration information may be sent in any one or more of unicast, multicast, and broadcast.

Optionally, when the UE2 receives the measurement configuration information sent by the UE1, a response message may be sent to the UE1, where the response message may indicate success, failure/rejection, or partial success/failure/rejection and specific success/failure/rejection reasons for the configuration). Optionally, the response message may be sent through a direct link, or may be sent through a forwarding manner. Optionally, the response may be a response to the configuration or a response to the (de) activation message.

Optionally, for a scenario in which the UE1 configures the UE2 with measurement, the UE2 state may be: Connected/Active connection state, idle state, Inactive state, OOC (out of coverage) state, etc. And the states of each UE may be any combination when multiple UE entities are involved as described above. For the scenario that the network device configures the UE, the UE is in an Active state.

Optionally, after receiving the data, the second terminal device needs to identify whether the specific data is sent to itself. For example, Tx UE defines granularity to Tx UE L2Id ═ 1 and Rx UE L2Id ═ 2 when Rx UE is configured with SL HARQ feedback switch, which is unconditional TB HARQ on; after Rx UE applies the configuration, after MAC of Rx UE receives any data in the following, if SRC (source) Id 1 and DST (destination) Id 2 carried in transmission data (control or user plane data), MAC of Rx UE considers that it is own data, and feeds back ACK/NACK to Tx UE according to the actual receiving condition. SL L2/L1Id/Address, Rx UE distinguishes whether the received data is the data addressed to the Rx UE according to the comparison between Tx SLL2/L1Id/Address carried by SCI in the subsequent data transmission and the Rx UE.

By implementing the embodiment of the invention, the terminal equipment can realize the configuration/application of the self-adaptive SL HARQ switch, so that the SLHARQ feedback is more flexible, and the requirements in various aspects can be met, for example, the load can be reduced by not starting the SL HARQ when the load is high, for example, the transmission efficiency is not influenced by not starting the SL HARQ by the low-delay service, the QoS requirement can be met by aiming at the low-reliability service only through blind retransmission, and the occupation of SL HARQ resources can also be reduced, and the like.

In the above embodiment, the first terminal device sends the configuration of the SL HARQ feedback switch to the second terminal device (specifically, the first terminal device configures the SL HARQ feedback switch for the second terminal device, or the first terminal device forwards the configuration information of the SL HARQ feedback switch configured by the network device for the second terminal device to the second terminal device) as an example, in other optional implementation manners, the network device may directly configure the SL HARQ feedback switch for the terminal device without forwarding by other devices. Referring to fig. 7, another HARQ feedback control method provided in the embodiment of the present invention is shown, where the method may include the following steps.

S501: the network device obtains HARQ configuration information.

S502: the network device sends HARQ configuration information to the terminal device, the terminal device receives the HARQ configuration information sent by the network device, and the HARQ configuration information comprises indication information indicating whether the terminal device carries out HARQ feedback for SL data.

S503: if the indication information indicates that the terminal device performs HARQ feedback for the SL data, the terminal device needs to perform HARQ feedback after receiving the SL data. If the indication information indicates that the terminal device does not perform HARQ feedback for the SL data, the terminal device does not need to perform HARQ feedback after receiving the SL data.

Optionally, the embodiment of the present invention is applicable to the application scenario shown in fig. 3E, that is, the network device directly configures HARQ configuration information for the terminal device. The network device may configure the SL HARQ feedback switch for one terminal device, or may configure the SL HARQ feedback switches for each terminal device (e.g., Tx UE and Rx UE, or all UEs in a group). In this case, the network device acquiring HARQ configuration information specifically includes: the network device generates HARQ configuration information.

Optionally, the embodiment of the present invention is also applicable to the application scenario shown in fig. 3D, that is, the first terminal device configures HARQ configuration information for the second terminal device, and forwards the HARQ configuration information through the network device. In this case, the network device sends HARQ configuration information to the terminal device, specifically: and the network equipment receives the HARQ configuration information sent by the other network equipment and sends the HARQ configuration information to the second terminal equipment.

Optionally, the network device may carry the HARQ configuration information in signaling such as NAS signaling, RRC signaling, SIB signaling, SDAP signaling, PDCP signaling, RLC signaling, mac (mac ce) signaling, and DCI, and send the HARQ configuration information to the terminal device.

Optionally, the SL HARQ feedback switch of the terminal device may be constrained by various conditions/granularities/scenes/objects/situations, and the conditions/granularities/scenes/objects/situations may refer to the description related to the conditions/granularities/scenes/objects/situations of the SL HARQ feedback switch of the second terminal device in the embodiment shown in fig. 4, which is not described again here.

Optionally, the SL HARQ feedback switch of the terminal device may be a conditional switch (conditional switch) or an unconditional switch (unconditional switch). A condition switch: i.e. the switch is applied when certain conditions are met. An unconditional switch: the configuration is effective and does not need to be switched on or off according to whether the condition is met. If the HARQ feedback switch is a conditional switch, the first HARQ configuration information further includes enabling condition information, and the enabling condition information is used for indicating a condition of the SLHARQ feedback switch. In this case, the terminal device enables HARQ feedback for SL data when the condition of the SLHARQ feedback switch is satisfied.

For the enabling condition of the SL HARQ feedback switch of the terminal device, reference may be made to the enabling condition of the SL HARQ feedback switch of the second terminal device in the foregoing embodiment shown in fig. 4, which is not described herein again.

Optionally, if the SL HARQ feedback switch of the terminal device is a conditional switch, when the state of the SL HARQ feedback switch changes (for example, the SL HARQ feedback switch changes from on to off, or from off to on), the terminal device sends change instruction information to the terminal device at the opposite side of the SL HARQ feedback switch, and the terminal device at the opposite side receives the change instruction information sent by the second terminal device, where the change instruction information is used to instruct the second terminal device whether to perform SL HARQ feedback. Optionally, the terminal device of the SL communication peer may also notify the network device of an event that the SL HARQ feedback state changes. For example, if the conditions of the SL HARQ feedback switch are switched from satisfied to unsatisfied (i.e., the SL HARQ feedback switch is switched from on to off), the Rx UE may send indication information to the terminal device (e.g., Tx UE) of the SL peer, where the indication information indicates that the conditions of the SL HARQ feedback switch are not satisfied, and the Tx UE of the peer does not need to request the feedback resource of the SL HARQ from the base station again. If the conditions of the SL HARQ feedback switch are switched from being not satisfied to being satisfied (i.e., the SL HARQ feedback switch is switched from off to on), the Rx UE sends indication information to the terminal device (e.g., Tx UE) of the SL opposite end, where the indication information indicates that the conditions of the SL HARQ feedback switch are satisfied, and the Tx UE of the opposite end needs to request the feedback resource of the SL HARQ from the base station again. After receiving the indication information of the change of the SL HARQ feedback switch sent by the Rx UE, the Tx UE may also report the information to the network device, so that the network device can determine whether to configure the SL HARQ feedback resource to the Rx UE.

Or, if the SL HARQ feedback switch of the terminal device is a conditional switch, when the state of the SL HARQ feedback switch changes (for example, the SL HARQ feedback switch changes from on to off, or from off to on), the terminal device sends change instruction information to its SL network device, and the network device receives change instruction information sent by the second terminal device, where the change instruction information is used to instruct the second terminal device whether to perform SL HARQ feedback. For example, if the conditions of the SL HARQ feedback switch are switched from satisfied to unsatisfied (i.e., the SL HARQ feedback switch is switched from on to off), the Rx UE may send indication information to its serving base station, where the indication information indicates that the conditions of the SL HARQ feedback switch are not satisfied, and the serving base station does not need to allocate the feedback resources of the SLHARQ to the Rx UE again. If the conditions of the SL HARQ feedback switch are switched from being not satisfied to being satisfied (that is, the SL HARQ feedback switch is switched from being off to being on), the Rx UE sends indication information to its serving base station, where the indication information indicates that the conditions of the SL HARQ feedback switch are satisfied, and the serving base station needs to reallocate feedback resources of the SL HARQ to the Rx UE.

Optionally, the HARQ configuration information may further include indication information used for indicating whether the terminal device feeds back the SL HARQ fed back by another terminal device to the network device through the Uu port. For example, when the UE1 is in the bs scheduling mode, the UE1 first requests the SL Grant from the bs each time it transmits SL data, and the UE1 waits for HARQ feedback on the SL of the UE2 after transmitting SL data to the UE2 to determine whether SL data reception is successful, and if the UE2 feeds back NACK, the UE1 also needs to feed back NACK to its serving bs through the Uu port after receiving NACK from the UE2, and then the bs allocates retransmission resources to the UE 1. If the indication information indicates that the UE1 needs to feed back to the base station after receiving the SL HARQ feedback sent by the other terminal device, the UE1 feeds back the SL HARQ feedback result to the base station through the Uu port after receiving the SL HARQ feedback sent by the UE 2.

Optionally, after receiving the data, the terminal device needs to identify whether the specific data is sent to itself. For example, when configuring the SL HARQ feedback switch for the Rx UE, the network device defines the granularity to Tx UE L2Id ═ 1 and Rx UE L2Id ═ 2, and the SL HARQ feedback switch is unconditional TB HARQ on; after Rx UE applies the configuration, after MAC of Rx UE receives any data in the following, if SRC (source) Id 1 and DST (destination) Id 2 carried in transmission data (control or user plane data), MAC of Rx UE considers that it is own data, and feeds back ACK/NACK to Tx UE according to the actual receiving condition. SL L2/L1Id/Address, Rx UE distinguishes whether the received data is the data addressed to the Rx UE according to the comparison between Tx SLL2/L1Id/Address carried by SCI in the subsequent data transmission and the Rx UE.

Other contents not mentioned in the embodiment of the present invention may refer to the related description in the embodiment of the method shown in fig. 4, and are not described again here.

By implementing the embodiment of the invention, the network equipment can directly configure the SL HARQ feedback switch for the terminal equipment, so that the requirements in various aspects can be met, for example, the load can be reduced by not starting the SL HARQ when the load is high, for example, the load can be reduced by not starting the SL HARQ for low-delay service, the transmission efficiency is not influenced, the QoS requirement can be met by only carrying out blind retransmission on the low-reliability service, the occupation of SL HARQ resources can be reduced, and the like.

In other alternative implementations, the terminal device may also configure the SL HARQ feedback switch directly for itself without relying on other devices. Referring to fig. 8, it is another HARQ feedback control method provided in the embodiment of the present invention, and the method may include the following processes.

S601: the terminal device configures HARQ configuration information for the terminal device, where the HARQ configuration information is used to indicate whether the terminal device performs HARQ feedback for SL data.

S602: if the HARQ configuration information indicates that the SL HARQ feedback switch of the terminal device is on, the terminal device needs to perform HARQ feedback after receiving the SL data. If the HARQ configuration information indicates that the SL HARQ feedback switch of the terminal device is off, the terminal device does not need to perform HARQ feedback after receiving the SL data.

Optionally, the embodiment of the present invention is applicable to a scenario in which the terminal device directly configures the SL HARQ feedback switch for itself. Optionally, the embodiment of the present invention is also applicable to the application scenarios shown in fig. 3A and fig. 3B, that is, in addition to configuring/reconfiguring/forwarding the HARQ configuration information for the UE2, the UE1 may also configure the HARQ configuration information for itself.

Optionally, the SL HARQ feedback switch of the terminal device may be constrained by various conditions/granularities/scenes/objects/situations, and the conditions/granularities/scenes/objects/situations may refer to the description related to the conditions/granularities/scenes/objects/situations of the SLHARQ feedback switch of the second terminal device in the embodiment shown in fig. 4, which is not described again here.

Alternatively, the HARQ feedback switch of the terminal device may be determined based on its measurement results. Exemplarily, before configuring the HARQ configuration information for the terminal device, the method further includes: the terminal device measures at least one measurement object to obtain a first measurement value of a measurement event. The HARQ feedback switch of the terminal device specifically includes: if the first measurement value meets the preset starting condition of the SL HARQ feedback switch, the terminal equipment configures the HARQ feedback switch of the terminal equipment to be on, and if the first measurement value does not meet the preset starting condition of the SLHARQ feedback switch, the terminal equipment configures the HARQ feedback switch of the terminal equipment to be off.

For the preset enabling condition of the SL HARQ feedback switch, reference may be made to the related description in the embodiment shown in fig. 4, which is not described herein again.

For example, the measurement object may be preset, and for example, the measurement object may include a frequency point/resource pool/BWP to be measured at the SL, and a reference signal to be measured at the SL, such as a reference signal and configuration information (e.g., time domain, frequency domain, spatial domain) such as SL SSB/SL CSI-RS, SL DMRS, SL PTRS, or SL SRS.

Optionally, if the state of the SL HARQ feedback switch of the terminal device changes (for example, the SL HARQ feedback switch changes from on to off, or from off to on), the terminal device sends change indication information to the terminal device at its SL peer end, and the terminal device at the peer end receives the change indication information, where the change indication information is used to indicate whether the terminal device performs SLHARQ feedback. Optionally, the terminal device of the SL communication peer may also notify the network device of an event that the SL HARQ feedback state changes. For example, if the conditions of the SL HARQ feedback switch are switched from satisfied to unsatisfied (i.e., the SL HARQ feedback switch is switched from on to off), the Rx UE may send indication information to the terminal device (e.g., Tx UE) of the SL peer, where the indication information indicates that the conditions of the SL HARQ feedback switch are not satisfied, and the Tx UE of the peer does not need to request the feedback resource of the SL HARQ from the base station again. If the conditions of the SL HARQ feedback switch are switched from being not satisfied to being satisfied (i.e., the SL HARQ feedback switch is switched from off to on), the Rx UE sends indication information to the terminal device (e.g., Tx UE) of the SL opposite end, where the indication information indicates that the conditions of the SL HARQ feedback switch are satisfied, and the Tx UE of the opposite end needs to request the feedback resource of the SL HARQ from the base station again. After receiving the indication information of the change of the SL HARQ feedback switch sent by the RxUE, the Tx UE may also report the indication information to the network device, so that the network device can determine whether to configure the SL HARQ feedback resource to the Rx UE.

Or, when the state of the SL HARQ feedback switch of the terminal device changes (for example, the SL HARQ feedback switch changes from on to off or from off to on), the terminal device sends change instruction information to its SL network device, and the network device receives the change instruction information sent by the terminal device, where the change instruction information is used to instruct the terminal device whether to perform SLHARQ feedback. For example, if the conditions of the SL HARQ feedback switch are switched from satisfied to unsatisfied (i.e., the SL HARQ feedback switch is switched from on to off), the Rx UE may send indication information to its serving base station, where the indication information indicates that the conditions of the SL HARQ feedback switch are not satisfied, and the serving base station does not need to allocate the feedback resources of the SL HARQ to the Rx UE again. If the conditions of the SL HARQ feedback switch are switched from being not satisfied to being satisfied (that is, the SL HARQ feedback switch is switched from being off to being on), the Rx UE sends indication information to its serving base station, where the indication information indicates that the conditions of the SL HARQ feedback switch are satisfied, and the serving base station needs to allocate the feedback resources of the SLHARQ to the RxUE again. Referring to fig. 9, a UE2 is schematically illustrated in which a SL HARQ feedback switch is configured for the UE1 itself, and when the state of the SL HARQ feedback switch changes, the SL HARQ feedback switch is notified to a network device or an opposite side of the SL.

Optionally, after receiving the data, the terminal device needs to identify whether the specific data is sent to itself. For example, when Rx UE configures the SL HARQ feedback switch for itself, the granularity is defined as Tx UE L2Id ═ 1 and Rx UE L2Id ═ 2, and the SLHARQ feedback switch is unconditional TB HARQ on; after Rx UE applies the configuration, after MAC of Rx UE receives any data in the following, if SRC (source) Id 1 and DST (destination) Id 2 carried in transmission data (control or user plane data), MAC of Rx UE considers that it is own data, and feeds back ACK/NACK to Tx UE according to the actual receiving condition. SL L2/L1Id/Address, Rx UE distinguishes whether the received data is the data addressed to the Rx UE according to the comparison between Tx SLL2/L1Id/Address carried by SCI in the subsequent data transmission and the Rx UE.

Optionally, the foregoing embodiments are all described by taking an HARQ feedback switch configured with SL data for the terminal device as an example, and for data transmitted on the Uu port, an HARQ feedback switch configured with Uu data for the terminal device in the same configuration manner may also be adopted, see fig. 10, which is another HARQ feedback control manner provided in the embodiments of the present invention, and the method may include the following steps.

S701: the first communication device acquires HARQ configuration information.

S702: the method comprises the steps that a first communication device configures HARQ configuration information to a second communication device, the second communication device receives the HARQ configuration information sent by the first communication device, and the HARQ configuration information comprises indication information indicating whether the second communication device carries out HARQ feedback aiming at Uu data.

S703: if the indication information indicates that the second communication device performs HARQ feedback for the Uu data, the second communication device needs to perform HARQ feedback after receiving the Uu data. The indication information indicates that the second communication device does not perform HARQ feedback for the Uu data, and the second communication device does not need to perform HARQ feedback after receiving the Uu data.

That is, the indication information is used to indicate whether the Uu HARQ feedback switch of the second communication device is on or off, or to indicate whether the Uu HARQ feedback switch of the second communication device is on or off. If the indication information indicates that the Uu HARQ feedback switch of the second communication device is on, the second communication device needs to perform HARQ feedback after receiving the Uu data. If the indication information indicates that the Uu HARQ feedback switch of the second communication device is off, the second communication device does not need to perform HARQ feedback after receiving the Uu data. The HARQ configuration information may be generated by the first communication device itself, or may be generated by another device and transmitted to the first communication device.

For example, the first communication device is a terminal device and the second communication device is a network device, or the first communication device is a network device and the second communication device is a terminal device. If the first communication device is a network device and the second communication device is a terminal device, it may be understood that the network device configures a Uu HARQ feedback switch for the terminal device, where the Uu HARQ feedback switch refers to whether the terminal device performs HARQ feedback after receiving DL data sent by the network device.

The embodiment of the invention can be applied to the scene shown in fig. 11, that is, the scene in which the network device communicates with the terminal device, and the network device can configure the Uu HARQ feedback switch for one or more terminal devices. Optionally, the embodiment of the present invention may also be applied to an SL scenario shown in fig. 3A, that is, the network device may configure a Uu HARQ feedback switch for the first terminal device. The UuHARQ feedback switch is used for indicating whether the terminal equipment needs to perform HARQ feedback after receiving Uu data. Optionally, the first communication device may directly configure for the second communication device, or may forward the configuration to the second communication device via a third-party device, which is not limited in the embodiment of the present invention.

Optionally, the Uu HARQ feedback switch of the second communications device may be constrained by various conditions/granularities/scenarios/objects/conditions, that is, the Uu HARQ feedback switch may increase applicable conditions/granularities/scenarios/objects/conditions, and the HARQ feedback switch is only used/applicable/applied/valid for a specific condition/granularities/scenarios/objects/conditions. For the conditions/granularity/scene/object/situation applicable to the Uu HARQ feedback switch, reference may be made to the conditions/granularity/scene/object/situation applicable to the SLHARQ feedback switch in the embodiment of the method shown in fig. 4, which is not described herein again. Besides, the applicable granularity of the Uu HARQ feedback switch may also be uplink data, downlink data, uplink data + downlink data. For example, if the applicable granularity of the Uu HARQ feedback switch is uplink data, the network device needs to perform HARQ feedback after receiving the uplink data sent by the terminal device. If the applicable granularity of the Uu HARQ feedback switch is downlink data, the terminal device needs to perform HARQ feedback after receiving the downlink data sent by the network device. If the applicable granularity of the Uu HARQ feedback switch is uplink data + downlink data, the network device needs to perform HARQ feedback after receiving the uplink data sent by the terminal device, and the terminal device needs to perform HARQ feedback after receiving the downlink data sent by the network device. The applicable granularity of the Uu HARQ feedback switch may also be applied when data is transmitted, or when data is received, or both. For example, if the applicable granularity of the Uu HARQ feedback switch is applied when receiving data, the network device needs to perform HARQ feedback after receiving uplink data sent by the terminal device.

Optionally, the Uu HARQ feedback switch may be a conditional switch (conditional switch) or an unconditional switch (unconditional switch). A condition switch: i.e. the switch is applied when certain enabling conditions are fulfilled. An unconditional switch: the configuration is effective and does not need to be switched on or off according to whether the condition is met. If the ue is a conditional switch, the HARQ configuration information further includes enabling condition information, where the enabling condition information is used to indicate an enabling condition of a Uu HARQ feedback switch. In this case, the second communication device enables HARQ feedback for the Uu data when the enabling condition of the Uu HARQ feedback switch is satisfied, and does not enable HARQ feedback for the Uu data when the enabling condition of the Uu HARQ feedback switch is not satisfied. For the related description of the enabling condition of the Uu HARQ feedback switch, reference may be made to the enabling condition of the SL HARQ feedback switch in the embodiment shown in fig. 4, except that the measured index is an index of the Uu port, and other similar indexes are not repeated here.

Optionally, if the Uu HARQ feedback switch of the terminal device is a conditional switch, when the state of the Uu HARQ feedback switch changes (for example, the Uu HARQ feedback switch changes from on to off, or from off to on), the terminal device sends change indication information to the network device, and the network device receives the change indication information sent by the terminal device, where the change indication information is used to indicate whether the terminal device performs Uu HARQ feedback. So that the network device knows whether the terminal device will perform Uu HARQ feedback. For example, if the condition of the Uu HARQ feedback switch is switched from satisfied to unsatisfied (that is, the Uu HARQ feedback switch is switched from on to off), the network device sends change indication information to the terminal device, where the change indication information indicates that the condition of the Uu HARQ feedback switch is not satisfied, and after receiving the change indication information, the network device learns that the terminal device does not perform Uu HARQ feedback, and does not need to allocate the Uu HARQ feedback resource to the terminal device again. If the condition of the Uu HARQ feedback switch is switched from unsatisfied to satisfied (that is, the Uu HARQ feedback switch is switched from off to on), the terminal device sends change indication information to the network device, the change indication information indicates that the condition of the Uu HARQ feedback switch is satisfied, after the network device receives the change indication information, it is known that the terminal device will perform Uu HARQ feedback, and then the feedback resource of the Uu HARQ needs to be allocated to the terminal device again.

Still taking the example that the base station configures the Uu HARQ feedback switch for the UE1 as an example, after receiving the configuration of the base station, the UE1 needs to apply the configuration, which is as follows:

and a MAC layer: if the switch for TB HARQ is turned on, the UE1 determines the switch granularity, and if the switch granularity satisfies the corresponding granularity, the switch granularity is set to granularity 1: if the Uu HARQ switch is configured, the Uu data is applied; for particle size 2: if the UE is configured as a uuDL HARQ feedback switch, applying the Uu DL data; for particle size 3: and if the TB-level HARQ feedback is configured to be opened, carrying out the TB-level HARQ feedback, otherwise, closing.

PHY layer: for a switch which is used for carrying out CBG HARQ, if the switch is turned on, the UE judges the switch granularity, and if the switch granularity meets the corresponding granularity, the switch granularity is determined as the granularity 1: if the Uu HARQ switch is configured, the Uu data is applied; for particle size 2: if the UE is configured as a uuDL HARQ feedback switch, applying the Uu DL data; for particle size 3: and if the CBG level HARQ feedback is configured to be opened, carrying out CBG level HARQ feedback, and if not, closing.

After receiving the data, the communication device needs to identify whether the specific data is sent to itself. For example, when the Uu HARQ feedback switch of the UE is turned on, the granularity is defined as UE1, and the Uu HARQ feedback switch is unconditional TB HARQ; after the UE applies the configuration, the UE1 descrambles data through its UE id after receiving any data in the following, and if descrambling is successful, the UE1 considers that the data is the own data, and feeds back ACK/NACK to the gNB according to the actual receiving condition. Illustratively, the identity of the UE may include the C-RNTI, IMSI, or TMSI.

By implementing the embodiment of the invention, the communication equipment can be configured with the Uu HARQ feedback switch, so that the requirements in various aspects can be met, for example, the Uu HARQ can be not started in high load, the load can be reduced, for example, the Uu HARQ is not started in low delay service, the load can be reduced, meanwhile, the transmission efficiency is not influenced, the QoS requirement can be met only by blind retransmission aiming at the low-reliability service, the Uu HARQ resource occupation can also be reduced, and the like.

An embodiment of the present invention further provides a HARQ feedback control method, which includes the following steps with reference to fig. 12.

S801: when the state of the HARQ feedback switch of the first communication equipment is changed, the first communication equipment sends change indication information to the second communication equipment, the second communication equipment receives the change indication information sent by the first communication equipment, and the change indication information is used for indicating that the HARQ feedback switch of the first communication equipment is changed from on to off or from off to on.

Taking the SL HARQ feedback switch as an example, when the SL HARQ feedback switch of the first terminal device is changed from on to off, the terminal device sends change instruction information to the second terminal device at the SL opposite end, where the change instruction information is used to instruct the SL HARQ feedback switch of the first terminal device to be changed from on to off. Then, the second terminal device at the opposite end may know that the SL HARQ feedback switch of the first terminal device is turned off, and the second terminal device does not need to request the base station to allocate the SL HARQ feedback resource of the first terminal device, and the second terminal device does not need to wait for receiving ACK/NACK of the first terminal device, and does not need to determine whether to retransmit according to the ACK/NACK fed back by the first terminal device. For example, if the SL HARQ feedback switch of the first terminal device is changed from on to off and the second terminal device is not notified of the change, the second terminal device waits for receiving the ACK fed back by the second terminal device, and the second terminal device retransmits data to the first terminal device all the time when the ACK fed back by the second terminal device is not received, which results in waste of transmission resources.

Optionally, the second terminal device of the SL communication peer may also notify the network device of an event that the feedback state of the SL HARQ changes, so that the network device knows that feedback resources of the SL HARQ do not need to be allocated to the first terminal device again.

Or, when the SL HARQ feedback switch of the first terminal device is changed from off to on, the terminal device sends change instruction information to the terminal device at the SL peer end, where the change instruction information is used to instruct the SL HARQ feedback switch of the first terminal device to be changed from off to on. Optionally, the terminal device of the SL communication peer may further notify the network device of an event that the feedback state of the SL HARQ changes, so that the network device can know that feedback resources of the SL HARQ need to be allocated to the first terminal device again.

By implementing the embodiment of the invention, when the HARQ feedback state of the communication equipment is changed, the HARQ feedback state can be notified to other communication equipment (such as a communication opposite end), so that the communication opposite end can know the HARQ feedback state of the communication equipment, and the communication performance is improved.

The above-mentioned scheme provided by the embodiment of the present application is mainly introduced from the perspective of interaction between network devices. It is to be understood that each network element, such as a terminal device, a network device, etc., contains a hardware structure and/or software modules for performing each function in order to realize the functions. Those of skill in the art would readily appreciate that the present application is capable of being implemented as hardware or a combination of hardware and computer software for performing the exemplary network elements and algorithm steps described in connection with the embodiments disclosed herein. Whether a function is performed as hardware or computer software drives hardware depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

In the embodiment of the present application, the terminal device, the network device, and the like may be divided into the functional modules according to the above method examples, for example, each functional module may be divided corresponding to each function, or two or more functions may be integrated into one processing module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. It should be noted that, in the embodiment of the present application, the division of the module is schematic, and is only one logic function division, and there may be another division manner in actual implementation.

In the case of dividing each functional module by corresponding functions, fig. 13 shows a schematic diagram of a possible logical structure of the terminal device according to the foregoing embodiment, and the terminal device 900 includes: a receiving unit 901, a processing unit 902 and a transmitting unit 903. Illustratively, the receiving unit 901 is configured to support the terminal device to perform the steps of receiving information by the terminal device in the foregoing method embodiments shown in fig. 4 to fig. 12. The sending unit 903 is configured to support the terminal device to perform the steps of sending information by the terminal device in the foregoing method embodiments shown in fig. 4 to fig. 12. A processing unit 902, configured to support the terminal device to perform the steps of the information determined by the terminal device in the foregoing method embodiments shown in fig. 4 to 12, and other functions besides the functions of the sending unit and the receiving unit, and the like.

In terms of hardware implementation, the processing unit 902 may be a processor or a processing circuit; the receiving unit 901 may be a receiver or a receiving circuit; the transmitting unit 903 may be a transmitter or a transmitting circuit, and the transmitting unit 903 and the receiving unit 901 may constitute a communication interface.

Fig. 14 is a schematic diagram of a possible hardware structure of the terminal device according to the foregoing embodiments, which is provided in the present application. The terminal device includes: a processor 1001. In the embodiment of the present application, the processor 1001 is configured to control and manage the operation of the terminal device, and for example, the processor 1001 is configured to support the steps of generating HARQ configuration information or applying HARQ configuration information by the terminal device in the embodiment. Optionally, the terminal device may further include a memory 1002 and a communication interface 1003, and the processor 1001, the communication interface 1003, and the memory 1002 may be connected to each other or connected to each other through a bus 1004. Illustratively, the memory 1002 is operable to store code and data for the terminal device. The communication interface 1003 is used for supporting the terminal device to perform communication. The bus 1004 may be a peripheral component interconnect standard PCI bus or an extended industry standard architecture EISA bus or the like.

Illustratively, the processor 1001 may be a central processing unit, a general-purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, transistor logic, a hardware component, or any combination thereof. Which may implement or perform the various illustrative logical blocks, modules, and circuits described in connection with the disclosure. A processor may also be a combination of computing functions, e.g., a combination of one or more microprocessors, a digital signal processor and a microprocessor, or the like.

In the case of dividing each functional module by corresponding functions, fig. 15 shows a schematic diagram of a possible logical structure of the network device according to the foregoing embodiment, where the network device includes: a sending unit 1101, a processing unit 1102 and a receiving unit 1103. Exemplarily, the sending unit 1101 is configured to support the steps of sending by the network device in the method embodiments shown in fig. 4 to fig. 12 described above; the receiving unit 1103 is configured to support the steps of receiving by the network device in the method embodiments shown in fig. 4 to fig. 12. A processing unit 1102, configured to support the network device to perform the steps of the information determined by the network device in the foregoing method embodiments shown in fig. 4 to fig. 12, and other functions besides the functions of the sending unit and the receiving unit, and the like.

In terms of hardware implementation, the processing unit 1102 may be a processor, a processing circuit, or the like; the receiving unit 1101 may be a receiver or a receiving circuit; the transmitting unit 1103 may be a transmitter or a transmitting circuit, etc., and the transmitting unit 1103 and the receiving unit 1101 may constitute a communication interface.

Fig. 16 is a schematic diagram of a possible hardware structure of the network device according to the foregoing embodiments, provided in this application. The network device includes: a processor 1201. In the embodiment of the present application, the processor 1201 is configured to control and manage the actions of the network device in the embodiment. Optionally, the network device may further include a memory 1202 and a communication interface 1203, and the processor 1201, the communication interface 1203 and the memory 1202 may be connected to each other or connected to each other through a bus 1204. Illustratively, the memory 1202 is operable to store program codes and data for the network devices and the communication interface 1203 is operable to support communications for the network devices. The processor 1201 calls the code stored in the memory 1202 for control management. The memory 1202 may or may not be coupled to the processor.

Illustratively, the processor 1201 may be a central processing unit, a general purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, transistor logic, a hardware component, or any combination thereof. Which may implement or perform the various illustrative logical blocks, modules, and circuits described in connection with the disclosure. A processor may also be a combination of computing functions, e.g., a combination of one or more microprocessors, a digital signal processor and a microprocessor, or the like.

Referring to fig. 17, fig. 17 shows a schematic structural diagram of a communication chip provided in the present application. As shown in fig. 17, the communication chip 1700 may include: a processor 1701, and one or more interfaces 1702 coupled to the processor 1701. The following are exemplary:

the processor 1701 may be used to read and execute computer readable instructions. In particular implementations, the processor 1701 may include primarily controllers, operators, and registers. Illustratively, the controller is mainly responsible for instruction decoding and sending out control signals for operations corresponding to the instructions. The arithmetic unit is mainly responsible for executing fixed-point or floating-point arithmetic operation, shift operation, logic operation and the like, and can also execute address operation and conversion. The register is mainly responsible for storing register operands, intermediate operation results and the like temporarily stored in the instruction execution process. In a specific implementation, the hardware architecture of the processor 1701 may be an Application Specific Integrated Circuit (ASIC) architecture, a microprocessor without interlocked pipeline stage architecture (MIPS) architecture, an advanced reduced instruction set machine (ARM) architecture, an NP architecture, or the like. The processors 1701 may be single core or multi-core.

The interface 1702 may be used to input data to be processed to the processor 1701, and may externally output a processing result of the processor 1701. In a specific implementation, the interface 1702 may be a general purpose input/output (GPIO) interface, and may be connected to a plurality of peripheral devices (e.g., a display (LCD), a camera (camara), a Radio Frequency (RF) module, and the like). The interface 1702 is connected to the processor 1701 via a bus 1703.

Herein, the processor 1701 may be configured to invoke, from the memory, an implementation procedure of the HARQ feedback control method provided in one or more embodiments of the present application on the communication device side, and execute instructions included in the implementation procedure. The memory may be integrated with the processor 1701 or may be coupled to the communication chip 170 via the interface 1702. The interface 1702 may be used to output the results of execution by the processor 1701. In this application, the interface 1702 may be specifically configured to output the decoding result of the processor 1701. For HARQ feedback control provided in one or more embodiments of the present application, reference may be made to the foregoing embodiments, which are not described herein again.

It should be noted that the functions of the processor 1701 and the interface 1702 may be implemented by hardware design, software design, or a combination of hardware and software, which is not limited herein.

In another embodiment of the present application, a computer storage medium is further provided, where the computer storage medium stores computer executable instructions, and when a device (which may be a single chip, a chip, or the like) or a processor may invoke the readable storage medium to store the computer executable instructions to perform the steps of the terminal device or the network device in the HARQ feedback control method provided in fig. 4 to 12. The aforementioned computer storage media may comprise: u disk, removable hard disk, read only memory, random access memory, magnetic or optical disk, etc. for storing program codes.

In another embodiment of the present application, there is also provided a computer program product comprising computer executable instructions stored in a computer readable storage medium; the computer executable instructions may be read by at least one processor of the apparatus from a computer readable storage medium, and the execution of the computer executable instructions by the at least one processor causes the apparatus to implement the steps of the terminal apparatus or the network apparatus in the HARQ feedback control method provided in fig. 4 to 12.

In another embodiment of the present application, there is also provided a communication system including a plurality of devices including at least two terminal devices. Alternatively, the communication system includes a plurality of devices including a network device and at least one terminal device. Illustratively, the terminal device may be the terminal device provided in fig. 13 or fig. 14, and is configured to perform the steps of the terminal device in the HARQ feedback control method provided in fig. 4 to fig. 12; and/or the network device may be the network device provided in fig. 15 or fig. 16, and is configured to perform the steps of the network device in the HARQ feedback control method provided in fig. 4 to fig. 12.

Finally, it should be noted that: the above is only an embodiment of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions within the technical scope of the present disclosure should be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Yet another aspect of the application provides an apparatus comprising a processor executing code in a memory to cause the apparatus to perform the various methods described previously. The memory stores code and data therein. The memory is located in a device, and the memory processor is coupled. The memory may also be located outside the device.

In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. The procedures or functions according to the embodiments of the invention are brought about in whole or in part when the computer program instructions are loaded and executed on a computer. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, the computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center by wire (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wirelessly (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that incorporates one or more of the available media. The usable medium may be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A HARQ feedback control method for hybrid automatic repeat request (HARQ) is characterized by comprising the following steps:

the first terminal equipment acquires first HARQ configuration information;

the first terminal equipment sends the first HARQ configuration information to second terminal equipment, wherein the first HARQ configuration information comprises first indication information which indicates whether the second terminal equipment carries out HARQ feedback aiming at the data of the side link SL.

2. The method of claim 1, wherein the first terminal device obtains first HARQ configuration information, comprising:

the first terminal equipment generates the first HARQ configuration information;

or, the first terminal device receives the first HARQ configuration information sent by the network device.

3. The method according to claim 1 or 2, wherein if the first indication information indicates that the second terminal device performs HARQ feedback for SL data, an interface for the second terminal device to perform HARQ feedback includes an SL interface or a Uu air interface.

4. A method according to any of claims 1 to 3, wherein the SL data comprises data of one or more traffic types, unicast, multicast or broadcast.

5. Method according to any of claims 1 to 4, wherein the SL data comprises data of a transport block TB of a medium access control MAC layer and/or a code block group CBG type of a physical layer.

6. The method according to any one of claims 1 to 5, wherein the condition that the first indication information is applicable comprises: the first terminal device is in a non-scheduling authorization mode, the first terminal device is in a dynamic scheduling mode, the first terminal device is in a semi-persistent scheduling mode, the first terminal device is in an autonomous contention mode, the SL data is data transmitted using a predetermined radio access technology, the SL data is data transmitted using a predetermined carrier, the SL data is data transmitted using a predetermined frequency, the first terminal device is located at a predetermined base station, the first terminal device is located at a predetermined cell, the second terminal device is located at a predetermined base station, the second terminal device is located at a predetermined cell, the first terminal device is a predetermined source terminal, the second terminal device is a predetermined target terminal, the second terminal device is a terminal included in a predetermined group, the SL data is data corresponding to a predetermined service, The SL data is one or more of data satisfying a preset quality of service, the SL data is data transmitted using a preset carrier bandwidth part BWP, the SL data is data transmitted using a preset logical channel group, the SL data is data transmitted using a preset logical channel, the SL data is data transmitted using a preset communication connection, the SL data is data transmitted using a preset group connection, or the SL data is data corresponding to a preset HARQ process.

7. The method according to any one of claims 1 to 6, wherein if the first indication information indicates that the second terminal device performs HARQ feedback for the SL data, the first HARQ configuration information further includes preset condition information, and the preset condition information is used for indicating a condition for performing HARQ feedback for the SL data by the second terminal device.

8. The method according to claim 7, wherein the preset condition information comprises that a preset measurement indicator is above, below, not above or not below a preset threshold and/or that the preset measurement indicator is or is not in a preset value list.

9. The method according to claim 8, wherein the measurement object corresponding to the preset measurement index includes one or more of a frequency point/resource pool/BWP required to be measured at SL, a reference signal required to be measured at SL, and resource configuration information, the reference signal includes a synchronization signal block SSB, a channel state information reference signal CSI-RS, a demodulation reference signal DMRS, a phase tracking reference signal PTRS, or a channel sounding reference signal SRS, and the resource configuration information includes any combination of time domain, frequency domain, or space domain.

10. The method according to claim 9, wherein the conditions to which the measurement object is applicable include: the first terminal device is in a non-scheduling authorization mode, the first terminal device is in a dynamic scheduling mode, the first terminal device is in a semi-persistent scheduling mode, the first terminal device is in an autonomous contention mode, the SL data is data transmitted using a predetermined radio access technology, the SL data is data transmitted using a predetermined carrier, the SL data is data transmitted using a predetermined frequency, the first terminal device is located at a predetermined base station, the first terminal device is located at a predetermined cell, the second terminal device is located at a predetermined base station, the second terminal device is located at a predetermined cell, the first terminal device is a predetermined source terminal, the second terminal device is a predetermined target terminal, the second terminal device is a terminal included in a predetermined group, the SL data is data corresponding to a predetermined service, The SL data is data satisfying a preset quality of service, the SL data is data transmitted using a preset BWP, the SL data is data transmitted using a preset logical channel group, the SL data is data transmitted using a preset logical channel, the SL data is data transmitted using a preset communication connection, or the SL data is data transmitted using a preset group connection.

11. The method according to any one of claims 8 to 10, wherein the preset measurement indicator comprises any one or more of channel quality corresponding to an SL interface, quality of service QoS corresponding to an SL interface, or a transmission indicator corresponding to an SL interface, wherein the channel quality corresponding to an SL interface comprises one or more of a channel busy ratio CBR, a reference signal received power RSRP, a reference signal received quality RSRQ, a received signal strength indication RSSI, a channel quality indication CQI, channel state information CSI, a precoding matrix indication PMI in a multiple-input multiple-output MIMO system, a RANK indication RI in a MIMO system, or a RANK of a channel matrix in a MIMO system; the QoS corresponding to the SL interface comprises one or more of a QoS target, a QoS requirement or a QoS value; the sending index corresponding to the SL interface comprises one or more of transmission rate, path loss, a Power Headroom Report (PHR), a Time Advance (TA), a Modulation and Coding Strategy (MCS), power or a block error rate; the QoS value includes latency, reliability, rate, throughput, communication distance, or payload.

12. The method of claim 2, wherein before the first terminal device generates the first HARQ configuration information, further comprising:

the first terminal equipment receives second HARQ configuration information sent by network equipment, wherein the second HARQ configuration information comprises second indication information indicating whether the first terminal equipment carries out HARQ feedback aiming at side link SL data;

the first terminal device generating the first HARQ configuration information includes:

and the first terminal equipment generates the first HARQ configuration information according to the second HARQ configuration information.

13. The method according to any of claims 1 to 12, wherein before the first terminal device acquires the first HARQ configuration information, further comprising:

the first terminal equipment sends measurement configuration information of a measurement event to the second terminal equipment, wherein the measurement configuration information comprises at least one measurement object and a reporting configuration requirement corresponding to the measurement event;

the first terminal device receives a measurement report of the measurement event sent by the second terminal device, where the measurement report is sent by the second terminal device when a first measurement value meets at least one of the reporting configuration requirements, and the first measurement value is obtained by the second terminal device measuring the at least one measurement object;

the first terminal device obtains first HARQ configuration information, specifically:

and the first terminal equipment generates the first HARQ configuration information according to the measurement report.

14. The method of claim 13, wherein the conditions for which the measurement event applies comprise: the first terminal device is in a non-scheduling authorization mode, the first terminal device is in a dynamic scheduling mode, the first terminal device is in a semi-persistent scheduling mode, the first terminal device is in an autonomous contention mode, the SL data is data transmitted using a predetermined radio access technology, the SL data is data transmitted using a predetermined carrier, the SL data is data transmitted using a predetermined frequency, the first terminal device is located at a predetermined base station, the first terminal device is located at a predetermined cell, the second terminal device is located at a predetermined base station, the second terminal device is located at a predetermined cell, the first terminal device is a predetermined source terminal, the second terminal device is a predetermined target terminal, the second terminal device is a terminal included in a predetermined group, the SL data is data corresponding to a predetermined service, The SL data is one or more of data satisfying a preset quality of service, the SL data is data transmitted using a preset carrier bandwidth part BWP, the SL data is data transmitted using a preset logical channel group, the SL data is data transmitted using a preset logical channel, the SL data is data transmitted using a preset communication connection, and the SL data is data transmitted using a preset group connection.

15. A HARQ feedback control method for hybrid automatic repeat request (HARQ) is characterized by comprising the following steps:

a second terminal device receives first HARQ configuration information sent by a first terminal device, wherein the first HARQ configuration information comprises first indication information indicating whether the second terminal device carries out HARQ feedback aiming at side link SL data;

if the first indication information indicates that the second terminal equipment performs HARQ feedback for SL data, the second terminal equipment performs HARQ feedback after receiving the SL data; if the first indication information indicates that the second terminal device does not perform HARQ feedback for the SL data, the second terminal device does not perform HARQ feedback after receiving the SL data.

16. The method of claim 15, wherein the first HARQ configuration information is generated by the first terminal device, or wherein the first HARQ configuration information is received by the first terminal device from a network device.

17. The method according to claim 15 or 16, wherein if the first indication information indicates that the second terminal device performs HARQ feedback for SL data, an interface for the second terminal device to perform HARQ feedback includes an SL interface or a Uu air interface.

18. A method according to any of claims 15 to 17, wherein the SL data comprises data for one or more traffic types, unicast, multicast or broadcast.

19. Method according to any of claims 15 to 18, wherein said SL data comprises data of the transport block TB of the medium access control MAC layer and/or the code block group CBG type of the physical layer.

20. The method according to any one of claims 15 to 19, wherein the condition that the first indication information is applicable comprises: the first terminal device is in a non-scheduling authorization mode, the first terminal device is in a dynamic scheduling mode, the first terminal device is in a semi-persistent scheduling mode, the first terminal device is in an autonomous contention mode, the SL data is data transmitted using a predetermined radio access technology, the SL data is data transmitted using a predetermined carrier, the SL data is data transmitted using a predetermined frequency, the first terminal device is located at a predetermined base station, the first terminal device is located at a predetermined cell, the second terminal device is located at a predetermined base station, the second terminal device is located at a predetermined cell, the first terminal device is a predetermined source terminal, the second terminal device is a predetermined target terminal, the second terminal device is a terminal included in a predetermined group, the SL data is data corresponding to a predetermined service, The SL data is one or more of data satisfying a preset quality of service, the SL data is data transmitted using a preset carrier bandwidth part BWP, the SL data is data transmitted using a preset logical channel group, the SL data is data transmitted using a preset logical channel, the SL data is data transmitted using a preset communication connection, the SL data is data transmitted using a preset group connection, or the SL data is data corresponding to a preset HARQ process.

21. The method according to any one of claims 15 to 20, wherein if the first indication information indicates that the second terminal device performs HARQ feedback for the SL data, the first HARQ configuration information further includes preset condition information, and the preset condition information is used to indicate a condition for performing HARQ feedback for the SL data by the second terminal device.

22. The method according to claim 21, wherein the preset condition information comprises that a preset measurement indicator is above, below, not above or not below a preset threshold and/or that the preset measurement indicator is or is not in a preset value list.

23. The method as claimed in claim 22, wherein the measurement object corresponding to the preset measurement indicator includes one or more of a frequency point/resource pool/BWP required to be measured at SL, a reference signal required to be measured at SL, and resource configuration information, the reference signal includes a synchronization signal block SSB, a channel state information reference signal CSI-RS, a demodulation reference signal DMRS, a phase tracking reference signal PTRS, or a channel sounding reference signal SRS, and the resource configuration information includes any combination of time domain, frequency domain, or spatial domain.

24. The method according to claim 23, wherein the conditions to which the measurement object is applicable include: the first terminal device is in a non-scheduling authorization mode, the first terminal device is in a dynamic scheduling mode, the first terminal device is in a semi-persistent scheduling mode, the first terminal device is in an autonomous contention mode, the SL data is data transmitted using a predetermined radio access technology, the SL data is data transmitted using a predetermined carrier, the SL data is data transmitted using a predetermined frequency, the first terminal device is located at a predetermined base station, the first terminal device is located at a predetermined cell, the second terminal device is located at a predetermined base station, the second terminal device is located at a predetermined cell, the first terminal device is a predetermined source terminal, the second terminal device is a predetermined target terminal, the second terminal device is a terminal included in a predetermined group, the SL data is data corresponding to a predetermined service, The SL data is data satisfying a preset quality of service, the SL data is data transmitted using a preset carrier bandwidth part BWP, the SL data is data transmitted using a preset logical channel group, the SL data is data transmitted using a preset logical channel, the SL data is data transmitted using a preset communication connection, or the SL data is data transmitted using a preset group connection.

25. The method according to any one of claims 22 to 24, wherein the preset measurement indicator comprises any one or more of channel quality corresponding to an SL interface, quality of service QoS corresponding to an SL interface, or a transmission indicator corresponding to an SL interface, wherein the channel quality corresponding to an SL interface comprises one or more of a channel busy ratio CBR, a reference signal received power RSRP, a reference signal received quality RSRQ, a received signal strength indication RSSI, a channel quality indication CQI, channel state information CSI, a precoding matrix indication PMI in a multiple-input multiple-output MIMO system, a RANK indication RI in a MIMO system, or a RANK of a channel matrix in a MIMO system; the QoS corresponding to the SL interface comprises one or more of a QoS target, a QoS requirement or a QoS value; the sending index corresponding to the SL interface comprises one or more of transmission rate, path loss, a Power Headroom Report (PHR), a Time Advance (TA), a Modulation and Coding Strategy (MCS), and power or a block error rate (BLER); the QoS value includes latency, reliability, rate, throughput, communication distance, or payload.

26. The method of claim 15, wherein the first HARQ configuration information is generated by the first terminal device according to second HARQ configuration information sent by a network device, and wherein the second HARQ configuration information includes second indication information indicating whether the first terminal device performs HARQ feedback for sidelink SL data.

27. The method according to any of claims 15 to 26, wherein before the second terminal device receives the first HARQ configuration information sent by the first terminal device, the method further comprises:

the second terminal device receives measurement configuration information for configuring a measurement event sent by the first terminal device, wherein the measurement configuration information comprises at least one measurement object and a reporting configuration requirement corresponding to the measurement event;

the second terminal device measures the at least one measurement object to obtain a first measurement value;

and when the first measurement value meets at least one of the reporting configuration requirements, the second terminal device sends a measurement report of the measurement event to the first terminal device, where the measurement report is used for the first terminal device to generate the first HARQ configuration information.

28. The method of claim 27, wherein the conditions for which the measurement event applies comprise: the first terminal device is in a non-scheduling authorization mode, the first terminal device is in a dynamic scheduling mode, the first terminal device is in a semi-persistent scheduling mode, the first terminal device is in an autonomous contention mode, the SL data is data transmitted using a predetermined radio access technology, the SL data is data transmitted using a predetermined carrier, the SL data is data transmitted using a predetermined frequency, the second terminal device is located at a predetermined base station, the second terminal device is located at a predetermined cell, the first terminal device is a predetermined source terminal, the second terminal device is a predetermined target terminal, the second terminal device is a terminal included in a predetermined group, the SL data is data corresponding to a predetermined service, the SL data is data satisfying a predetermined quality of service, the SL data is data transmitted using a predetermined carrier bandwidth part BWP, The SL data is one or more of data transmitted using a preset logical channel group, data transmitted using a preset logical channel, data transmitted using a preset communication connection, and data transmitted using a preset group connection.

29. A terminal device, characterized in that the terminal device is a first terminal device comprising means or an element for performing the HARQ feedback control method of any of claims 1 to 14.

30. A terminal device, characterized in that the terminal device is a second terminal device comprising means or an element for performing the HARQ feedback control method of any of claims 15 to 28.