WO2022178813A1

WO2022178813A1 - Sidelink communication method and apparatus

Info

Publication number: WO2022178813A1
Application number: PCT/CN2021/078095
Authority: WO
Inventors: 余唱; 常俊仁; 彭文杰
Original assignee: 华为技术有限公司
Priority date: 2021-02-26
Filing date: 2021-02-26
Publication date: 2022-09-01
Also published as: CN116636302A

Abstract

A sidelink communication method and apparatus. The method comprises that: a first terminal device sends, to a second terminal device, SCI of which an HARQ attribute is enabling, and the first terminal device starts or restarts a discontinuous reception inactivity timer when receiving HARQ feedback from the second terminal device; and accordingly, the second terminal device starts or restarts the discontinuous reception inactivity timer when sending the HARQ feedback to the first terminal device. Optionally, when transmitting, between the first terminal device and the second terminal device, SCI of which the HARQ attribute is disabling, the first terminal device no longer starts or restarts the discontinuous reception inactivity timer, such that the first terminal device and the second terminal device synchronously start the discontinuous reception inactivity timer, and the activation time of the first terminal device and the second terminal device is aligned.

Description

A kind of sidelink communication method and device

technical field

The present application relates to the field of communication technologies, and in particular, to a sidelink communication method and apparatus.

Background technique

In the wireless communication system, in order to save the power consumption of user equipment (UE) on the premise of ensuring the effective transmission of data, a discontinuous reception (DRX) mechanism is introduced to control the UE to monitor the physical downlink control. Channel (physical downlink control channel, PDCCH) behavior. The DRX mechanism may also be referred to as an air interface DRX (Uu DRX) mechanism.

If there is no Uu DRX mechanism, the UE will keep monitoring the PDCCH to see if there is information from the serving cell. However, in reality, in many cases, the UE does not always interact with the network for effective information, does not always perform upload or download services, and does not always transmit voice data during a call. If there is no data exchange between the UE and the network, the UE continues to monitor the PDCCH, which obviously consumes a lot of power. Therefore, on the premise of ensuring effective data transmission, the Uu DRX mechanism can be used to save UE power.

When Uu DRX is configured, the UE can periodically enter the "sleep state" at certain times. The UE does not need to continuously monitor the PDCCH, but when it needs to monitor, it wakes up from the sleep state, so that the UE can reach the purpose of power saving. Although this has a certain impact on the delay of data transmission, if this delay does not affect the user experience, then considering the more important power consumption of the UE, it makes sense to perform Uu DRX.

At present, in the sidelink (sidelink, SL) research of the communication protocol version 17 (release17, R17) of the 3rd generation partnership project (3GPP), it is proposed to introduce SL DRX. Similar to the above Uu DRX, the SL DRX is used to control the receiving UE to monitor sidelink control information (SCI). That is, the UE wakes up and monitors the SCIs sent by other UEs within the activation time period, and if the UE enters the sleep state, it cannot receive the SCIs.

In SL DRX, the active time of the UE includes the time when the following timers are running: DRX-on Duration timer, DRX-inactivity timer, and DRX-inactivity timer Retransmission timer DRX-Retransmission timer. Due to the influence of various factors, the timers started by the sending UE and the receiving UE may be out of synchronization, and the activation times of the two may be misaligned, affecting the normal communication of the two.

SUMMARY OF THE INVENTION

The present application provides a sidelink communication method and device, so that the timers of the transmitter and the receiver are started synchronously, and the activation times of the two are aligned.

A first aspect provides a sidelink communication method, comprising: a first terminal device sending a hybrid automatic repeat request (HARQ) attribute to a second terminal device to enable sidelink control information SCI, where the HARQ attribute is enabling the second terminal device to send HARQ feedback of the SCI or the SCI-scheduled data to the first terminal device when receiving the SCI or the SCI-scheduled sidelink SL data; The first terminal device receives HARQ feedback of the SCI or the data scheduled by the SCI from the second terminal device, and the first terminal device starts or restarts a discontinuous reception inactivity timer. Optionally, it further includes: the first terminal device sends an SCI whose HARQ attribute is disabled to the second terminal device, and the first terminal device keeps the discontinuous reception inactivity timer in an inactive state , the HARQ attribute is disabled indicating that when the second terminal device receives the SCI or the SL data scheduled by the SCI, it does not send the SCI or the SL scheduled by the SCI to the first terminal device HARQ feedback for data.

It can be seen from the above that for an SCI whose HARQ attribute is disabled, since the second terminal does not feed back HARQ, the first terminal device cannot explicitly determine whether the second terminal device has received the current SCI. However, with the design of the first aspect, for the SCI whose HARQ attribute is disabled, the discontinuous reception inactivity timer is not started or restarted. For an SCI whose HARQ attribute is enabled, the first terminal device restarts the DRX inactivity timer when receiving the HARQ feedback of the SCI, and the second terminal device restarts the DRX inactivity timer when sending HARQ feedback. An activity timer; thereby enabling the first terminal device and the second terminal device to start the discontinuous reception inactivity timer synchronously, so that the activation times of the first terminal device and the second terminal device are aligned.

In a possible implementation manner, the SCI includes a first-level SCI, or a first-level SCI and a second-level SCI. Optionally, the SCI may be carried in the PSCCH for transmission.

In a second aspect, a sidelink communication method is provided. For the beneficial effects of the second aspect, reference can be made to the description of the first aspect. The method includes: a second terminal device receiving a hybrid automatic repeat request from the first terminal device The HARQ attribute is the enabled sidelink control information SCI, and the HARQ attribute is enabled to indicate that when the second terminal device receives the SCI or the sidelink SL data scheduled by the SCI, it sends a message to the second terminal device. The first terminal device sends the HARQ feedback of the SCI or the data scheduled by the SCI; the second terminal device sends the HARQ feedback of the SCI or the SL data scheduled by the SCI to the first terminal device, the The second terminal device starts or restarts the discontinuous reception inactivity timer. Optionally, it further includes: the second terminal device receives an SCI whose HARQ attribute is disabled from the first terminal device, and the second terminal device keeps the discontinuous reception inactivity timer as inactive state, the HARQ attribute is disabled indicates that when the second terminal device receives the SCI or the SL data scheduled by the SCI, it does not send the SCI or the SCI-scheduled data to the first terminal device. HARQ feedback for SL data.

A third aspect provides a sidelink communication method, comprising: a second terminal device sending first information to a first terminal device, the HARQ attribute of the HARQ request of the first information is enabled, the HARQ The attribute is enable indicates that when the first terminal device receives the first information, the HARQ feedback of the first information is sent to the second terminal device; the second terminal device receives the HARQ feedback from the first terminal device. HARQ feedback of the first information of the device, when the HARQ feedback is a positive acknowledgement ACK, the second terminal device uses the discontinuous reception DRX long cycle.

Take the second terminal device as an RX UE and the first terminal device as a TX UE as an example. In the design of the above third aspect, when the RX UE needs to switch from the DRX short cycle to the DRX long cycle, the RX UE can send the first information to the TX UE, and the HARQ attribute of the first information is enabled. When the TX UE receives the above-mentioned first information, it may determine whether to allow the RX UE to enter the DRX long cycle. If the TX UE agrees that the RX UE enters the DRX long cycle, the TX UE may send HARQ feedback of ACK to the RX UE. When the RX UE receives the HARQ feedback of the above ACK, it switches from the DRX short cycle to the DRX long cycle. By adopting the design of the third aspect, the DRX cycles of the TX UE and the RX UE can be made consistent.

In a possible implementation manner, the first information indicates to use the DRX long cycle.

In a possible implementation manner, the first information is carried in a medium access control control element MAC CE.

In a possible implementation manner, the first information carries indication information of a first link, and the first link is used for the first terminal device to send SL data information to the second terminal device or SL control information.

In a possible implementation manner, the indication information of the first link includes: a pair of destination identifier and source identifier, the destination identifier is the identifier of the receiver, and the source identifier is the identifier of the sender; or the first the identifier of the link; or the connection identifier of the first link.

In a fourth aspect, a sidelink communication method is provided. For the beneficial effects of the fourth aspect, reference may be made to the above-mentioned description of the third aspect. The method includes: a first terminal device receiving first information from a second terminal device , the HARQ attribute of the HARQ attribute of the first information is enabled, and the HARQ attribute is enabled indicates that when the first terminal device receives the first information, it sends the information to the second terminal device. HARQ feedback of the first information; the first terminal device sends the HARQ feedback of the first information to the second terminal device, and when the HARQ feedback is a positive acknowledgement ACK, the first terminal device uses discontinuous Receive DRX long cycle.

In a possible implementation manner, the indication information of the first link includes a pair of destination identifier and source identifier, the destination identifier is the identifier of the receiver, and the source identifier is the identifier of the sender; or the first link road identifier; or the connection identifier of the first link.

In a fifth aspect, a sidelink communication method is provided, comprising: a first terminal device sending second information to a second terminal device, the HARQ attribute of the HARQ request of the second information is enabled, the HARQ The attribute is Enable indicating that when the second terminal device receives the second information, the HARQ feedback of the second information is sent to the first terminal device; the first terminal device receives the HARQ feedback from the second terminal device. HARQ feedback of the second information of the device, when the HARQ feedback is a positive acknowledgement ACK, the first terminal device uses the discontinuous reception DRX short cycle.

Taking the first terminal device as a TX UE and the second terminal device as an RX UE as an example, using the design of the fifth aspect above, the TX UE sends a second signal to the RX UE when the conditions for switching from the DRX long cycle to the DRX short cycle are met. information, when the RX UE agrees to switch to the DRX short cycle, the TX UE and the RX UE switch to the DRX short cycle, so that the DRX cycles of the TX UE and the RX UE can be consistent.

In a possible implementation manner, the second information indicates to use the DRX short cycle.

In a possible implementation manner, the second information is carried in a medium access control control element MAC CE.

In a possible implementation manner, the second information carries indication information of a first link, and the first link is used for the first terminal device to send SL data information to the second terminal device or SL control information.

In a possible implementation manner, the indication information of the first link includes: a pair of a destination identifier and a source identifier, the destination identifier is the identifier of the receiving end, and the source identifier is the identifier of the sending end; or the first the identifier of the link; or the connection identifier of the first link.

In a sixth aspect, a sidelink communication method is provided. For the beneficial effects of the sixth aspect, reference may be made to the description of the fifth aspect. The method at least includes: the second terminal device receives the second information from the first terminal device, The HARQ attribute of the hybrid automatic repeat request of the second information is enabled, and the HARQ attribute of the enabled indicates that the second terminal device sends all the information to the first terminal device when receiving the second information. HARQ feedback of the second information; the second terminal device sends the HARQ feedback of the second information to the first terminal device, and when the HARQ feedback is a positive acknowledgement ACK, the second terminal device uses Continuously receive DRX short cycles.

A seventh aspect provides a sidelink communication method, comprising: the first terminal device only sends the sidelink control information whose HARQ attribute of the HARQ is enabled during the activation period of the discontinuous reception DRX long cycle SCI, the HARQ attribute is to enable and instruct the second terminal device to send the HARQ feedback of the SCI or SL data to the first terminal device when receiving the sidelink SL data scheduled by the SCI or the SCI; The first terminal device starts or restarts the discontinuous reception inactivity timer when receiving the HARQ feedback of the SCI or SL data, and when the discontinuous reception inactivity timer expires, the first terminal device Use discontinuous reception DRX short cycle.

Take the first terminal device as the TX UE, the second terminal device as the RX UE, and the discontinuous reception inactivity timer as the inactivity timer as an example. The DRX cycles of the TX UE and the RX UE are inconsistent, mainly because the SCI sent by the TX UE and the RX UE failed to receive, resulting in the RX UE not starting the inactivity timer; when the inactivity timer times out, the RX UE does not start the shortcycle timer either. By adopting the design of the seventh aspect, the TX UE only transmits the SCI whose HARQ attribute is enabled during the activation time of the DRX long period. When the TX UE receives the HARQ feedback of the SCI or the SL data scheduled by the SCI, the Start or restart the inactivity timer. While the RX UE starts or restarts the inactivity timer when sending the HARQ feedback of the SCI or the SL data scheduled by the SCI. In this way, the inactivity timers of the TX UE and the RX UE are started synchronously, so that the shortcycle timers of the two are started synchronously, and the TX UE and the RX UE are switched to the DRX short cycle synchronously.

In an eighth aspect, a sidelink communication method is provided, including: the first terminal device determines that the discontinuous reception DRX between the first terminal device and the second terminal device is at the activation time, and only the HARQ attribute of the hybrid automatic repeat request is disabled The DRX retransmission timer is running, and the HARQ attribute is disabled instructs the second terminal device to send a message to the first terminal device when receiving the information corresponding to the DRX retransmission timer. Send the HARQ feedback corresponding to the information; perform transmission between the first terminal device and the second terminal device with the HARQ attribute being disabled, and the HARQ attribute being disabled indicates that the second terminal device is receiving When the corresponding information is transmitted, the HARQ feedback of the information is not sent to the first terminal device.

Taking the first terminal equipment as TX UE, the second terminal equipment as RX UE, and the discontinuous reception retransmission timer as Re TX timer as an example; using the design of the above eighth aspect, the DRX between the TX UE and the RX UE is in the Activation time, and currently only the ReTX timer whose HARQ attribute is disabled is running, the transmission with the HARQ attribute enabled will no longer be performed between the TX UE and the RX UE, which can prevent the TX UE from sending the SL information with the HARQ attribute enabled. Or after the data, the HARQ feedback from the RX UE is not received, and the problem of SL RLF is triggered.

In a possible implementation manner, performing the HARQ attribute-disabled transmission between the first terminal device and the second terminal device includes: the first terminal device does not send the data to the second terminal device The HARQ attribute is enabled new transmission, and/or the first terminal device sends a new transmission or retransmission whose HARQ attribute is disabled to the second terminal device.

In a possible implementation manner, the first terminal device does not send a new transmission whose HARQ attribute is enabled to the second terminal device, including: the first terminal device only multiplexes the authorization corresponding to the new transmission The HARQ attribute is the disabled logical channel LCH; or, the first terminal device clears the grant corresponding to the new transmission.

In a possible implementation manner, the new transmission includes a new transport block TB, or sidelink control information SCI indicating the new transmission.

In a possible implementation, the retransmission includes a retransmission TB, or an SCI indicating retransmission.

In a possible implementation, it also includes:

When the transmission between the first terminal device and the second terminal device in which the HARQ attribute is disabled ends, the first terminal device stops the discontinuous reception and retransmission of the sidelink SL process corresponding to the transmission timer.

In a ninth aspect, a sidelink communication apparatus is provided, and the apparatus may be a first terminal device or a chip in the first terminal device. The communication device has the function of realizing the above-mentioned first aspect. For example, the communication device includes modules or units or means (means) corresponding to the steps involved in performing the above-mentioned first aspect, and the functions, units or means may be implemented by software, or by hardware, or by hardware to perform corresponding Software Implementation.

In a possible design, the communication device includes a processing unit and a transceiver unit, wherein the transceiver unit can be used to send and receive signals to implement communication between the communication device and other devices, for example, the transceiver unit is used to receive data from Configuration information of the network device; the processing unit can be used to perform some internal operations of the communication device. The functions performed by the processing unit and the transceiver unit may correspond to the steps involved in the first aspect above.

In a possible design, the communication device includes a processor, and may also include a transceiver, where the transceiver is used for transmitting and receiving signals, and the processor executes program instructions to implement any possible design or design in the first aspect above or method in the implementation. Wherein, the communication device may further comprise one or more memories, the memories being coupled to the processor. The one or more memories may be integrated with the processor, or may be provided separately from the processor, which is not limited in this application. The memory may hold the necessary computer programs or instructions to implement the functions referred to in the first aspect above. The processor may execute computer programs or instructions stored in the memory, and when the computer programs or instructions are executed, cause the communication apparatus to implement the method in any possible design or implementation manner of the first aspect.

In a possible design, the communication device includes a processor and a memory, and the memory can store necessary computer programs or instructions for implementing the functions involved in the first aspect above. The processor may execute computer programs or instructions stored in the memory, and when the computer programs or instructions are executed, cause the communication apparatus to implement the method in any possible design or implementation manner of the first aspect.

In a possible design, the communication device includes at least one processor and an interface circuit, wherein the at least one processor is configured to communicate with other devices through the interface circuit, and execute any possible design or implementation of the first aspect above method in method.

In a tenth aspect, a sidelink communication apparatus is provided, and the apparatus may be a second terminal device or a chip in the second terminal device. The communication device has the function of realizing the above-mentioned second aspect. For example, the communication device includes modules or units or means (means) corresponding to the steps involved in the execution of the second aspect. The functions, units or means may be implemented by software, or by hardware, or by hardware to perform corresponding Software Implementation.

In a possible design, the communication device includes a processing unit and a transceiver unit, wherein the transceiver unit can be used to send and receive signals to implement communication between the communication device and other devices, for example, the transceiver unit is used to receive data from Configuration information of the network device; the processing unit can be used to perform some internal operations of the communication device. The functions performed by the processing unit and the transceiver unit may correspond to the steps involved in the second aspect above.

In a possible design, the communication device includes a processor, and may also include a transceiver, where the transceiver is used for transmitting and receiving signals, and the processor executes program instructions to implement any possible design or design in the second aspect above or method in the implementation. Wherein, the communication device may further comprise one or more memories, the memories being coupled to the processor. The one or more memories may be integrated with the processor, or may be provided separately from the processor, which is not limited in this application. The memory may hold the necessary computer programs or instructions to implement the functions referred to in the second aspect above. The processor can execute computer programs or instructions stored in the memory, and when the computer programs or instructions are executed, cause the communication apparatus to implement the method in any possible design or implementation manner of the second aspect.

In a possible design, the communication device includes a processor and a memory, and the memory can store necessary computer programs or instructions for implementing the functions involved in the second aspect above. The processor can execute computer programs or instructions stored in the memory, and when the computer programs or instructions are executed, cause the communication apparatus to implement the method in any possible design or implementation manner of the second aspect.

In a possible design, the communication device includes at least one processor and an interface circuit, wherein the at least one processor is configured to communicate with other devices through the interface circuit, and execute any possible design or implementation of the second aspect above method in method.

In an eleventh aspect, a sidelink communication apparatus is provided, and the apparatus may be a second terminal device or a chip in the second terminal device. The communication device has the function of realizing the third aspect. For example, the communication device includes modules or units or means (means) corresponding to the steps involved in performing the above third aspect. The functions, units or means may be implemented by software, or by hardware, or by hardware to perform corresponding Software Implementation.

In a possible design, the communication device includes a processing unit and a transceiver unit, wherein the transceiver unit can be used to send and receive signals to implement communication between the communication device and other devices, for example, the transceiver unit is used to receive data from Configuration information of the network device; the processing unit can be used to perform some internal operations of the communication device. The functions performed by the processing unit and the transceiver unit may correspond to the steps involved in the third aspect above.

In a possible design, the communication device includes a processor, and may also include a transceiver, where the transceiver is used for transmitting and receiving signals, and the processor executes program instructions to complete any possible design or design in the third aspect above or method in the implementation. Wherein, the communication device may further comprise one or more memories, the memories being coupled to the processor. The one or more memories may be integrated with the processor, or may be provided separately from the processor, which is not limited in this application. The memory may hold the necessary computer programs or instructions to implement the functions referred to in the third aspect above. The processor may execute computer programs or instructions stored in the memory, and when the computer programs or instructions are executed, cause the communication apparatus to implement the method in any possible design or implementation manner of the third aspect.

In a possible design, the communication device includes a processor and a memory, and the memory can store necessary computer programs or instructions for implementing the functions involved in the third aspect above. The processor may execute computer programs or instructions stored in the memory, and when the computer programs or instructions are executed, cause the communication apparatus to implement the method in any possible design or implementation manner of the third aspect.

In a possible design, the communication device includes at least one processor and an interface circuit, wherein the at least one processor is configured to communicate with other devices through the interface circuit, and execute any possible design or implementation of the third aspect above method in method.

A twelfth aspect provides a sidelink communication apparatus, where the apparatus may be a first terminal device or a chip in the first terminal device. The communication device has the function of realizing the above-mentioned fourth aspect. For example, the communication device includes modules or units or means (means) corresponding to the steps involved in the execution of the fourth aspect. The functions, units or means may be implemented by software, or by hardware, or by hardware to perform corresponding steps. Software Implementation.

In a possible design, the communication device includes a processing unit and a transceiver unit, wherein the transceiver unit can be used to send and receive signals to implement communication between the communication device and other devices, for example, the transceiver unit is used to receive data from Configuration information of the network device; the processing unit can be used to perform some internal operations of the communication device. The functions performed by the processing unit and the transceiver unit may correspond to the steps involved in the fourth aspect above.

In a possible design, the communication device includes a processor, and may also include a transceiver, where the transceiver is used to send and receive signals, and the processor executes program instructions to complete any possible design or design in the fourth aspect above or method in the implementation. Wherein, the communication device may further comprise one or more memories, the memories being coupled to the processor. The one or more memories may be integrated with the processor, or may be provided separately from the processor, which is not limited in this application. The memory may store necessary computer programs or instructions to implement the functions referred to in the fourth aspect above. The processor may execute computer programs or instructions stored in the memory, and when the computer programs or instructions are executed, cause the communication apparatus to implement the method in any possible design or implementation manner of the fourth aspect.

In a possible design, the communication device includes a processor and a memory, and the memory can store necessary computer programs or instructions for implementing the functions involved in the fourth aspect above. The processor may execute computer programs or instructions stored in the memory, and when the computer programs or instructions are executed, cause the communication apparatus to implement the method in any possible design or implementation manner of the fourth aspect.

In a possible design, the communication device includes at least one processor and an interface circuit, wherein the at least one processor is configured to communicate with other devices through the interface circuit, and execute any possible design or implementation of the fourth aspect above method in method.

A thirteenth aspect provides a sidelink communication apparatus, where the apparatus may be a first terminal device or a chip in the first terminal device. The communication device has the function of realizing the above-mentioned fifth aspect. For example, the communication device includes modules or units or means (means) corresponding to the steps involved in performing the above-mentioned fifth aspect, and the functions, units or means may be implemented by software, or by hardware, or by hardware to perform corresponding Software Implementation.

In a possible design, the communication device includes a processing unit and a transceiver unit, wherein the transceiver unit can be used to send and receive signals to implement communication between the communication device and other devices, for example, the transceiver unit is used to receive data from Configuration information of the network device; the processing unit can be used to perform some internal operations of the communication device. The functions performed by the processing unit and the transceiver unit may correspond to the steps involved in the fifth aspect above.

In a possible design, the communication apparatus includes a processor, and may also include a transceiver, where the transceiver is used for transmitting and receiving signals, and the processor executes program instructions to complete any possible design or design in the fifth aspect above or method in the implementation. Wherein, the communication device may further comprise one or more memories, the memories being coupled to the processor. The one or more memories may be integrated with the processor, or may be provided separately from the processor, which is not limited in this application. The memory may store necessary computer programs or instructions to implement the functions referred to in the fifth aspect above. The processor may execute computer programs or instructions stored in the memory, and when the computer programs or instructions are executed, cause the communication apparatus to implement the method in any possible design or implementation manner of the fifth aspect.

In a possible design, the communication device includes a processor and a memory, and the memory can store necessary computer programs or instructions for implementing the functions involved in the fifth aspect. The processor may execute computer programs or instructions stored in the memory, and when the computer programs or instructions are executed, cause the communication apparatus to implement the method in any possible design or implementation manner of the fifth aspect.

In a possible design, the communication device includes at least one processor and an interface circuit, wherein the at least one processor is configured to communicate with other devices through the interface circuit, and execute any possible design or implementation of the fifth aspect above method in method.

A fourteenth aspect provides a sidelink communication apparatus, where the apparatus may be a second terminal device or a chip in the second terminal device. The communication device has the function of realizing the above-mentioned sixth aspect. For example, the communication device includes modules or units or means (means) corresponding to the steps involved in performing the above-mentioned sixth aspect, and the functions, units or means may be implemented by software, or by hardware, or by hardware to perform corresponding Software Implementation.

In a possible design, the communication device includes a processing unit and a transceiver unit, wherein the transceiver unit can be used to send and receive signals to implement communication between the communication device and other devices, for example, the transceiver unit is used to receive data from Configuration information of the network device; the processing unit can be used to perform some internal operations of the communication device. The functions performed by the processing unit and the transceiver unit may correspond to the steps involved in the sixth aspect.

In a possible design, the communication apparatus includes a processor, and may also include a transceiver, where the transceiver is used for transmitting and receiving signals, and the processor executes program instructions to complete any possible design or design in the sixth aspect above or method in the implementation. Wherein, the communication device may further comprise one or more memories, the memories being coupled to the processor. The one or more memories may be integrated with the processor, or may be provided separately from the processor, which is not limited in this application. The memory may store necessary computer programs or instructions to implement the functions referred to in the sixth aspect above. The processor may execute computer programs or instructions stored in the memory, and when the computer programs or instructions are executed, cause the communication apparatus to implement the method in any possible design or implementation manner of the sixth aspect.

In a possible design, the communication device includes a processor and a memory, and the memory can store necessary computer programs or instructions for implementing the functions involved in the sixth aspect. The processor may execute computer programs or instructions stored in the memory, and when the computer programs or instructions are executed, cause the communication apparatus to implement the method in any possible design or implementation manner of the sixth aspect.

In a possible design, the communication device includes at least one processor and an interface circuit, wherein the at least one processor is configured to communicate with other devices through the interface circuit, and execute any possible design or implementation of the sixth aspect above method in method.

A fifteenth aspect provides a sidelink communication apparatus, where the apparatus may be a first terminal device or a chip in the first terminal device. The communication device has the function of realizing the above-mentioned seventh aspect. For example, the communication device includes modules or units or means (means) corresponding to the steps involved in performing the above seventh aspect, and the functions or units or means may be implemented by software, or by hardware, or by hardware to perform corresponding Software Implementation.

In a possible design, the communication device includes a processing unit and a transceiver unit, wherein the transceiver unit can be used to send and receive signals to implement communication between the communication device and other devices, for example, the transceiver unit is used to receive data from Configuration information of the network device; the processing unit can be used to perform some internal operations of the communication device. The functions performed by the processing unit and the transceiver unit may correspond to the steps involved in the above seventh aspect.

In a possible design, the communication device includes a processor, and may also include a transceiver, where the transceiver is used for transmitting and receiving signals, and the processor executes program instructions to complete any possible design or design in the seventh aspect above or method in the implementation. Wherein, the communication device may further comprise one or more memories, the memories being coupled to the processor. The one or more memories may be integrated with the processor, or may be provided separately from the processor, which is not limited in this application. The memory may store necessary computer programs or instructions to implement the functions referred to in the seventh aspect above. The processor may execute computer programs or instructions stored in the memory, and when the computer programs or instructions are executed, cause the communication apparatus to implement the method in any possible design or implementation manner of the seventh aspect.

In a possible design, the communication device includes a processor and a memory, and the memory can store necessary computer programs or instructions for implementing the functions involved in the seventh aspect above. The processor may execute computer programs or instructions stored in the memory, and when the computer programs or instructions are executed, cause the communication apparatus to implement the method in any possible design or implementation manner of the seventh aspect.

In a possible design, the communication device includes at least one processor and an interface circuit, wherein the at least one processor is configured to communicate with other devices through the interface circuit, and execute any possible design or implementation of the seventh aspect above method in method.

A sixteenth aspect provides a sidelink communication apparatus, where the apparatus may be a first terminal device or a chip in the first terminal device. The communication device has the function of realizing the above-mentioned eighth aspect. For example, the communication device includes modules or units or means corresponding to the steps involved in the execution of the eighth aspect. The functions, units or means may be implemented by software, or by hardware, or by hardware to perform corresponding steps. Software Implementation.

In a possible design, the communication device includes a processing unit and a transceiver unit, wherein the transceiver unit can be used to send and receive signals to implement communication between the communication device and other devices, for example, the transceiver unit is used to receive data from Configuration information of the network device; the processing unit can be used to perform some internal operations of the communication device. The functions performed by the processing unit and the transceiver unit may correspond to the steps involved in the eighth aspect above.

In a possible design, the communication apparatus includes a processor, and may also include a transceiver, where the transceiver is used for transmitting and receiving signals, and the processor executes program instructions to complete any possible design or design in the eighth aspect above or method in the implementation. Wherein, the communication device may further comprise one or more memories, the memories being coupled to the processor. The one or more memories may be integrated with the processor, or may be provided separately from the processor, which is not limited in this application. The memory may store necessary computer programs or instructions to implement the functions involved in the eighth aspect above. The processor can execute the computer program or instructions stored in the memory, and when the computer program or instructions are executed, the communication apparatus can implement the method in any possible design or implementation manner of the eighth aspect.

In a possible design, the communication device includes a processor and a memory, and the memory can store necessary computer programs or instructions for implementing the functions involved in the eighth aspect above. The processor can execute the computer program or instructions stored in the memory, and when the computer program or instructions are executed, the communication apparatus can implement the method in any possible design or implementation manner of the eighth aspect.

In a possible design, the communication device includes at least one processor and an interface circuit, wherein the at least one processor is configured to communicate with other devices through the interface circuit, and execute any possible design or implementation of the eighth aspect above method in method.

A seventeenth aspect provides a communication system, the communication system comprising the communication device of the ninth aspect, the twelfth aspect, the thirteenth aspect, the fifteenth aspect, or the sixteenth aspect, and, the tenth aspect, The communication device of the eleventh aspect or the fourteenth aspect.

In an eighteenth aspect, the present application provides a computer-readable storage medium, where computer-readable instructions are stored in the computer storage medium, and when the computer reads and executes the computer-readable instructions, the computer causes the computer to execute the above-mentioned first aspect The method in any possible design to the eighth aspect.

In a nineteenth aspect, the present application provides a computer program product that, when the computer reads and executes the computer program product, causes the computer to execute the method in any possible design of the first to eighth aspects.

In a twentieth aspect, the present application provides a chip, the chip includes a processor, the processor is coupled with a memory, and is configured to read and execute a software program stored in the memory, so as to implement the above-mentioned first to sixth aspects Method in any of the eight possible designs.

Description of drawings

1 is a schematic diagram of a system architecture provided by an embodiment of the present application;

FIG. 2 is a schematic diagram of a cycle of SLDRX provided by an embodiment of the present application;

3 is a schematic diagram of starting inactivity timer in the current scheme provided by the embodiment of the present application;

4 is a schematic flowchart of a sidelink communication method provided by an embodiment of the present application;

5 is a schematic diagram of starting an inactivity timer provided by an embodiment of the present application;

6 is a schematic diagram of inconsistent DRX cycles in the current solution provided by the embodiment of the present application;

FIG. 7 is a schematic flowchart of a sidelink communication method provided by an embodiment of the present application;

8 is a schematic diagram of DRX cycle switching provided by an embodiment of the present application;

FIG. 9 is a schematic flowchart of a sidelink communication method provided by an embodiment of the present application;

10 is a schematic flowchart of a sidelink communication method provided by an embodiment of the present application;

11 is a schematic diagram of configuring RTT timer and ReTx timer provided by the embodiment of the present application;

12 is a schematic flowchart of a sidelink communication method provided by an embodiment of the present application;

13 is a schematic structural diagram of an apparatus provided by an embodiment of the present application;

FIG. 14 is another schematic structural diagram of an apparatus provided by an embodiment of the present application.

Detailed ways

The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings.

FIG. 1 shows a communication system 100 to which the embodiments of the present application can be applied. The communication system 100 may be a long term evolution (long term evolution, LTE) system, a fifth generation ( ^5th generation, 5G) communication system, a new radio (new radio, NR) system, and may also be a machine to machine (machine to machine, M2M) communication system, vehicle networking communication system, device to device (device to device, D2D) communication system, sixth generation and subsequent future evolution communication systems, etc.

As shown in FIG. 1 , the communication system 100 may include: two or more terminal devices 101 . The communication between the terminal device 101 and the terminal device 101 may be performed through a wireless interface (eg, a PC5 interface). On the PC5 interface, the link for transmitting data between the terminal device 101 and the terminal device 101 is called a sidelink (sidelink, SL).

SL communication is generally used in vehicle-to-everything (V2X) or D2D and other direct communication scenarios. V2X refers to the connection of vehicles to the network or the network of vehicles, including 4 different types of applications, namely vehicle-to-vehicle (V2V), vehicle-to-infrastructure (V2I), vehicle-to-network (vehicle to network, V2N), and vehicle to pedestrian (V2P), etc. Through these four applications, vehicles, roadside infrastructure, application servers and pedestrians can collect, process and share status information of surrounding vehicles and environments to provide more intelligent services such as unmanned driving, Automated driving, driver assistance, intelligent driving, connected driving, intelligent network driving, and car sharing, etc.

As shown in FIG. 1 , in a V2V scenario, the terminal device 101 may be a vehicle-mounted terminal. On the PC5 interface, the in-vehicle terminal and the in-vehicle terminal exchange data through SL, such as vehicle position, vehicle speed, driving direction and other data indicating vehicle dynamics. For example, the in-vehicle terminal A may send SL data to another in-vehicle terminal B through the SL, where the SL data is used to indicate the content expressed by the above data. For example, the content displayed in the user interface of the in-vehicle terminal B may be "the license plate number of the vehicle behind ("FAF787"), the driving operation being performed by the vehicle behind ("the vehicle behind FAF787 is performing an overtaking operation"), the The current vehicle speed ("80km/h"), etc. Of course, the above-mentioned "rear vehicle" refers to the vehicle terminal A. In this way, the occurrence rate of traffic accidents can be reduced and driving safety can be enhanced.

Optionally, the communication system 100 shown in FIG. 1 may further include a network device 102 . The communication interface between the network device 102 and the terminal device 101 is an air interface. The network device 102 may communicate with the terminal device 101 through an air interface under the control of the network control device. The air interface is also called Uu interface in some communication systems.

In a possible implementation manner, the network device 102 may send downlink control information (downlink control information, DCI) to the terminal device 101 through an air interface, where the DCI is used to allocate SL resources for the terminal device 101. The two terminal devices 101 may perform SL communication on the SL resources allocated above. In the embodiment of the present application, in the communication mode based on the SL link, the resource allocation of the SL includes two modes: the first mode, the resource allocation scheduled by the base station, is also referred to as mode 1 (mode-1). When the UE needs to transmit data on the SL, the UE can send a request to the base station through the air interface, and the base station can allocate SL resources to the UE according to the above request, and indicate the allocated SL resources to the UE through DCI. In the second mode, the UE autonomously selects the mode, which is also referred to as mode-2. When the UE needs to transmit data on the SL, the UE can select the SL resource by itself in the resource pool configured or preconfigured by the base station.

It should be noted that the above communication system 100 shown in FIG. 1 is only for clearly illustrating the technical solutions of the present application, and does not constitute a limitation to the present application. Those skilled in the art can know that with the evolution of the network architecture and the emergence of new service scenarios, the technical solutions provided in the embodiments of the present application are also applicable to similar technical problems.

For ease of understanding, the terms or terms involved in the embodiments of the present application are first introduced, and the nouns or terms are also part of the invention content of the embodiments of the present application.

1. Terminal equipment

A terminal device, which may be referred to as a terminal for short, is a device with a wireless transceiver function. Terminal equipment can be deployed on land, including indoor or outdoor, handheld or vehicle; can also be deployed on water (such as ships, etc.); can also be deployed in the air (such as aircraft, balloons and satellites, etc.). The terminal device can be a mobile phone (mobile phone), a tablet computer (pad), a computer with wireless transceiver function, a virtual reality (virtual reality, VR) terminal device, an augmented reality (augmented reality, AR) terminal device, industrial control ( Wireless terminal equipment in industrial control, wireless terminal equipment in self driving, wireless terminal equipment in remote medical, wireless terminal equipment in smart grid, transportation security (transportation) Wireless terminal equipment in safety), wireless terminal equipment in smart city (smart city), wireless terminal equipment in smart home (smart home), and may also include user equipment (user equipment, UE) and the like. The terminal device may also be a cellular phone, a cordless phone, a session initiation protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (PDA), a wireless communication Functional handheld devices, computing devices or other processing devices connected to wireless modems, in-vehicle devices, wearable devices, terminal devices in future 5th generation (5G) networks or future evolved public land mobile communication networks (public terminal equipment in land mobile network, PLMN), etc. Terminal equipment may also sometimes be referred to as terminal, access terminal equipment, vehicle terminal equipment, industrial control terminal equipment, UE unit, UE station, mobile station, mobile station, remote station, remote terminal equipment, mobile equipment, UE terminal equipment, terminal equipment, wireless communication equipment, UE proxy or UE device, etc. Terminal devices can also be stationary or mobile. This embodiment of the present application does not limit this.

2. Network equipment

A network device can be an access network device, and an access network device can also be called a radio access network (RAN) device, which is a device that provides wireless communication functions for terminal devices. Access network equipment includes, but is not limited to, the next generation base station (generation nodeB, gNB), evolved node B (evolved node B, eNB), radio network controller (radio network controller, RNC), node B ( node B, NB), base station controller (BSC), base transceiver station (base transceiver station, BTS), home base station (for example, home evolved nodeB, or home node B, HNB), baseband unit (baseband unit) , BBU), sending and receiving point (transmitting and receiving point, TRP), transmitting point (transmitting point, TP), mobile switching center, etc. The access network device may also be a wireless controller, a centralized unit (centralized unit, CU), and/or a distributed unit (DU) in a cloud radio access network (cloud radio access network, CRAN) scenario, or a network The device can be a relay station, an access point, a vehicle-mounted device, a wearable device, and a network device in a future 5G network or a network device in a future evolved PLMN network, and the like. A terminal device can communicate with multiple access network devices of different technologies. For example, a terminal device can communicate with an access network device that supports long term evolution (LTE), and can also communicate with an access network device that supports 5G. , it can also be dual-connected with LTE-enabled access network equipment and 5G-enabled access network equipment. The embodiments of the present application are not limited.

3. Sidelink (SL)

The side link is used for the communication between the terminal equipment and the terminal equipment, and the communication interface between the terminal equipment and the terminal equipment is the PC5 interface. Channels involved in sidelink communication may include a physical sidelink shared channel (PSSCH), a physical sidelink control channel (PSCCH), and a physical sidelink feedback channel (physical sidelink feedback channel, PSFCH).

Wherein, PSSCH is used to carry sidelink data (SL data), PSCCH is used to carry sidelink control information (sidelink control information, SCI), the SCI may also be called sidelink scheduling assignment (sidelink scheduling assignment, SL) SA). The SL SA is information related to data scheduling, for example, information such as resource configuration and/or modulation and coding scheme (modulation and coding scheme, MCS) used to bear the PSSCH. The PSFCH may include information such as a hybrid automatic repeat request (HARQ). The HARQ information may specifically be a negative acknowledgment (NACK) or an acknowledgment (ACK).

It should be noted that, in the sidelink communication method provided in this embodiment of the present application, the first terminal device may be a transmitting user equipment (transmit user equipment, TX UE), and the second terminal device may be a receiving user equipment (receive user equipment). equipment, RX UE), the first terminal device and the second terminal device may adopt a unicast communication mode, or a multicast communication mode, etc., which is not limited. When the multicast communication mode is adopted, the number of second terminal devices may be one or more. In the description of this application, unless otherwise stated, "/" indicates that the object associated with it is an "or" relationship, for example, A/B can indicate A or B; "and/or" in this application is only It is an association relationship that describes an associated object, indicating that there can be three kinds of relationships, for example, A and/or B, which can be expressed as: A alone exists, A and B exist at the same time, and B exists alone, among which A, B Can be singular or plural. Also, in the description of the present application, unless stated otherwise, "plurality" means two or more than two. "At least one item(s) below" or similar expressions thereof refer to any combination of these items, including any combination of single item(s) or plural items(s). For example, at least one (a) of a, b, or c can represent: a, b, c, a-b, a-c, b-c, or a-b-c, where a, b, c may be single or multiple . In addition, in order to clearly describe the technical solutions of the embodiments of the present application, in the embodiments of the present application, words such as "first" and "second" are used to distinguish the same or similar items with basically the same function and effect. Those skilled in the art can understand that the words "first", "second" and the like do not limit the quantity and execution order, and the words "first", "second" and the like are not necessarily different.

Based on the communication system 100 shown in FIG. 1, an application scenario is provided: a SL discontinuous reception (DRX) mechanism is configured between the TX UE and the RX UE. When SL DRX is configured, the UE can periodically enter the "sleep state" at certain times. The UE does not need to continuously monitor the SCI, but when it needs to monitor, the UE wakes up from the sleep state, which can save the power of the UE. the goal of. That is, SL DRX is used to control the behavior of the RX UE to monitor the SCI. That is, the UE can wake up in a specific time period to monitor the SCIs sent by other UEs. If the UE enters the sleep state, the UE cannot receive at least the SCI for data reception. In this embodiment of the present application, the SCI may be a first-level SCI, or a first-level SCI and a second-level SCI, and the like. Optionally, the SCI may be carried in the PSCCH for transmission.

Illustratively, as shown in Figure 2, an SL DRX cycle consists of an activation period (on-duration) and an inactive period (opportunity for DRX). Among them, in the activation time period "on duration", the UE is in a awake state, and in the inactive time period "opportunity for DRX", the UE is in a sleep state. In a possible implementation, an activation timer on duration timer can be set. When the on duration timer is running, the UE is in the activation time period on duraiton; or, when the on duration timer times out, the UE is in the inactive time period opportunity for DRX. In order to reduce the data transmission delay. The following timers are also proposed in SL DRX:

1. Discontinuous reception inactivity timer DRX-inactivity timer

In the following description, how to start the DRX-inactivity timer for TX UE and RX UE is described as an example. Among them, TX UE refers to the terminal equipment at the transmitting end in SL transmission; RX UE means the terminal equipment at the receiving end in SL transmission.

In most cases, after the RX UE is scheduled to receive SL data at a certain SCI occasion (occasion), it is likely to continue to be scheduled to receive SL data in the next few subframes (subframes) to complete a comparative analysis. Reception of large byte SL data. If the RX UE has entered the sleep state, the RX UE needs to wait until the next SL DRX cycle to monitor the SCI to receive subsequent scheduling. This will increase the data transmission delay. In order to reduce this kind of delay, a timer is introduced in the DRX mechanism: DRX-inactivity timer. When the RX UE monitors and receives an SCI for scheduling SL data, the RX UE starts or restarts the DRX-inactivity timer. The RX UE monitors the SCI every subframe during the operation of the DRX-inactivity timer until the timer expires. It can be seen that the introduction of the DRX-inactivity timer can ensure that the RX UE is at the active time during the operation of the DRX-inactivity timer and receives the scheduling of the next TX UE, which is equivalent to extending the "on duration".

According to the above description, when the RX UE receives the SCI sent by the TX UE, it will start or restart the DRX-inactivity timer. For the TX UE after sending the SCI, the TX UE will start or restart the DRX-inactivity timer. In this way, the start of the DRX-inactivity timers of the TX UE and the RX UE may be asynchronous, resulting in misalignment of the activation times of the TX UE and the RX UE.

For example, as shown in Figure 3, the TX UE sends three SCIs respectively, and the three SCIs are represented by SCI1, SCI2 and SCI3 respectively. Each system frame (system frame, SF) includes 10 subframes (subframes), and each subframe includes 2 time slots (slots) as an example. For example, as shown in FIG. 3 , SCI1 is transmitted in time slot 1 in subframe 0 in system frame number (system frame number, SFN) 0, that is, SCI1 is in the second subframe of (0, 0) subframe. time slot transmission. SCI2 is transmitted in the first slot in the (0, 2) subframe, and SCI3 is transmitted in the first slot in the (0, 3) subframe. In the following description of this application, the above expression (system frame, subframe)=(A, B) will be used, where A represents the SFN corresponding to the subframe, and B represents the system frame corresponding to the SFN for transmitting SCI number of the subframe.

In a possible implementation manner, the behavior on the TX UE side: the TX UE sends SCI1 within the time period of the on duration timer, and starts the DRX-inactivity timer. Send SCI2, restart DRX-activity timer. Send SCI3 and restart the DRX-activity timer again.

Behavior on the RX UE side: The RX UE receives SCI1 during the on-duraiton timer period and starts the DRX-inactivity timer. However, the transmission of SCI2 and SCI3 failed, and the RX UE failed to successfully receive SCI2 and SCI3, and failed to restart the DRX-activity timer, resulting in the misalignment of the activation times of the TX UE and the RX UE. In a possible implementation, since the RX UE did not successfully receive the SCI2, the corresponding DRX-activity timer was not restarted, and the TX UE did not know that the RX did not successfully receive the SCI2, and restarted the corresponding DRX-activity after sending the SCI2 timer, which causes the TX UE to think that the RX UE is at the activation time when the subsequent TX UE sends SCI3, but the RX UE is not actually at the activation time, so the RX UE cannot receive the SCI3.

In response to the above problem, the embodiments of the present application provide the following solutions: First, the HARQ attribute is introduced. HARQ attributes include HARQ enabled and HARQ disabled. In a possible implementation, the TX UE may send an SCI to the RX UE, where the SCI includes a HARQ attribute field. When the RX UE receives the above SCI, it determines whether to send HARQ feedback to the TX UE according to the HARQ attribute carried in the HARQ attribute field included in the SCI. For example, if the HARQ attribute field in the SCI carries the HARQ enable, the RX UE needs to feed back HARQ for the SCI or the SL data scheduled by the SCI. However, if the HARQ attribute field in the SCI carries HARQ disabled, the RX UE does not need to feed back HARQ for the SL data scheduled by the SCI or the SCI.

In the solution of the embodiment of the present application, the startup condition of the above-mentioned DRX-inactivity timer is modified. For the SCI whose HARQ attribute is enabled, the TX UE starts or restarts the DRX-inactivity timer when receiving the HARQ feedback of the SCI. For the RX UE, when it receives an SCI whose HARQ attribute is enabled, and sends the HARQ feedback of the SCI, it starts or restarts the DRX-inactivity timer. Optionally, for the transmission of the SCI with the HARQ attribute disabled, neither the TX UE nor the RX UE starts or restarts the DRX-inactivity timer. The DRX-Inactivity timer can be called sl-inactivity timer. Hereinafter referred to as inactivity timer. The following instructions are made about the inactivity timer:

The RX UE wakes up and monitors the SCI during each on duration; if the RX UE successfully decodes the SCI and sends the HARQ feedback corresponding to the SCI, the RX UE will remain awake and start an inactivity timer. The inactivity timer can be considered as the duration that the UE waits to continue monitoring the SCI since the last successful decoding of the SCI. If the timer expires, the UE may return to the sleep state.

As shown in FIG. 4 , a flow of a sidelink communication method is provided, and the flow can solve the problem that the above-mentioned inactivity timers are not started synchronously, resulting in the misalignment of the activation time between the TX UE and the RX UE. The process includes at least:

Step 400: The first terminal device sends an SCI whose HARQ attribute is enabled to the second terminal device. Optionally, the first terminal device may be a TX UE, and the second terminal device may be an RX UE.

In a possible implementation manner, the SCI may include a HARQ attribute field, and the HARQ attribute carried in the HARQ attribute field may be HARQ enable or HARQ disable. Wherein, if the HARQ attribute carried in the field of the HARQ attribute is HARQ enabled, the SCI can be called the HARQ attribute is the enabled SCI, and the HARQ attribute is the enabled SL indicating that the second terminal device receives the SCI or the SCI scheduling data, send HARQ feedback to the first terminal device, where the HARQ feedback is the HARQ feedback of the SCI or the SL data scheduled by the SCI. Alternatively, if the HARQ attribute carried in the HARQ attribute field is HARQ disabled, the SCI may be called the HARQ attribute disabled SCI, and the HARQ attribute being disabled indicates that the second terminal device receives the SCI or SCI scheduling When the SL data is received, no HARQ feedback is sent to the first terminal device. The following description can be made about the SCI. The SCI can schedule the receiving end UE, that is, the second terminal device to receive the SL data. The SCI may include an SL grant, where the SL grant is used to schedule the receiving end UE to receive SL data on the corresponding SL resource. In this embodiment of the present application, if the HARQ attribute of an SCI is enabled, when the receiving UE receives the SCI or the SL data scheduled by the SCI, it can send HARQ feedback to the transmitting UE, that is, the first terminal device. Taking the SCI as an example to illustrate, the UE at the sending end sends the SCI, the HARQ attribute of the SCI is enabled, and when the UE at the receiving end receives the SCI, if the SCI is successfully decoded, the UE at the receiving end sends an ACK to the UE at the sending end; or, If the decoding of the SCI fails, the receiving end UE sends a NACK to the transmitting end UE, etc. The HARQ attribute being disabled indicates that when the second terminal device receives the SCI or the SL data scheduled by the SCI, it does not send the HARQ feedback of the SCI or the SL data scheduled by the SCI to the first terminal device.

Step 401: The second terminal device sends the HARQ feedback of the SCI or the SL data scheduled by the SCI to the first terminal device, and the second terminal device starts or restarts the inactivity timer.

For example, the second terminal device may start or restart the inactivity timer when or after sending the HARQ feedback. For example, the RX UE can start the inactivity timer, etc., in the next symbol or time slot after sending the HARQ feedback.

Step 402: The first terminal device receives the SCI or SCI-scheduled HARQ feedback from the second terminal device, and the first terminal device starts or restarts the inactivity timer.

For example, the first terminal device may start or restart the inactivity timer when or after receiving the HARQ feedback. For example, the TX UE may start an inactivity timer, etc., in the next symbol or time slot etc. after receiving HARQ feedback.

Optionally, the process shown in FIG. 4 may further include: the first terminal device sends an SCI whose HARQ feedback attribute is disabled to the second terminal device, and the first terminal device keeps the inactivity timer in an inactive state. Correspondingly, when the second terminal device receives an SCI whose HARQ attribute is disabled from the first terminal device, the second terminal device keeps the inactivity timer in an inactive state. Optionally, the above-mentioned keeping the inactivity timer in an inactive state can be understood as: the first terminal device does not start or restart the inactivity timer. That is, in this solution, when the first terminal device and the second terminal device transmit the SCI whose HARQ attribute is enabled, when receiving or sending HARQ feedback, the inactivity timer is started or restarted. For the transmission of the SCI whose HARQ attribute is disabled, the inactivity timer is not started or restarted between the first terminal device and the second terminal device.

It can be seen from the above that for an SCI whose HARQ attribute is disabled, since the receiving end does not feed back HARQ, the transmitting end cannot clearly determine whether the receiving end has received the current SCI. However, in the embodiment of the present application, for the SCI whose HARQ attribute is disabled, the Inactivity timer is not started or restarted. For an SCI whose HARQ attribute is enabled, the sender starts the inactivity timer when it receives the HARQ feedback of the SCI, and starts the inactivity timer when the receiver sends the HARQ feedback; thus, the receiver and the sender start the inactivity synchronously. timer, so that the activation time of the receiver and the sender are aligned.

It should be pointed out that in the description of the embodiments of this application, the SCI may be carried in PSCCH for transmission, the SL data scheduled by the SCI may be carried in PSSCH for transmission, and the HARQ feedback may be carried in PSFCH for transmission.

Aiming at the problem that the activation time of the TX UE and the RX UE is not aligned due to the activation of the inactivity timer, an example is provided, that is, the example can be a specific implementation of the process shown in Figure 4 above, including at least:

Modify the start condition of the inactivity timer, specifically: only extend the activation time of the HARQ-enabled SCI, and start the inactivity timer. E.g:

For TX UE: Send HARQ-enabled SCI and start inactivity timer when ACK or NACK feedback is received.

For RX UE: After receiving HARQ-enabled SCI and sending ACK or NACK feedback, start the inactivity timer.

For example, as shown in FIG. 5, the TX UE sends the SCI to the RX UE within the time unit of (SFN, subframe) = (0, 0). The RX UE successfully receives the SCI, and sends the HARQ feedback information to the TX UE in the time unit of (0, 2). The RX UE starts the inactivity timer after sending the HARQ feedback information, and the running time of the inactivity timer is 4 time slots . Correspondingly, the TX UE starts the inactivity timer after receiving the HARQ feedback of the RX UE within the time unit of (0, 2). Exemplarily, the above-mentioned HARQ feedback may be carried in the PSFCH and sent.

The TX UE sends the SCI to the RX UE in the (0, 2) time unit, and the RX UE does not receive it. Therefore, in the (0, 4) time unit where the HARQ feedback information should be sent, the HARQ feedback information will not be sent to the TX UE. The inactivity timer will not be started. Correspondingly, since the TX UE does not receive the HARQ feedback information of the RX UE within the (0, 4) time unit, the TX UE will not start the inactivty timer.

It can be seen from the above that the start condition of the inactivity timer is modified to: start the inactivity timer only for the HARQ-enabled SCI, and the RX UE starts the inactivity timer when or after sending HARQ feedback, and when the TX UE receives HARQ feedback Only start the inactivity timer, so that the TX UE and the RX UE can align the start time of the inactivity timer and the activation time of the TX UE and the RX UE.

The inactivity timer in SL DRX was introduced earlier. The following continues to introduce the discontinuous reception short-cycle timer DRXshortcycle timer in SL DRX. The DRXshortcycle timer is introduced as follows:

In this embodiment of the present application, when the inactivity timer times out, the TX UE or the RX UE can start or restart the DRXshortcycle timer. As mentioned above, the DRX cycle consists of the activation time period on duration and the inactive time period opportunity for DRX. During the operation of the DRX shortycycle timer, the UE uses the DRX shortycycle timer. When the DRX shortcycle timer times out, the UE uses the DRX long cycle. Optionally, if the UE successfully decodes the PDCCH scheduled for new transmission during the running period of the DRX long period, the UE may start to use the DRX short period. In the following description, DRXshortcycle timer can be referred to as shortcycle timer for short.

In the current solution, when the TX UE or RX UE times out of the inactivity timer, the shortcycle timer will be started. According to the above analysis, when the SCI transmission fails, the inactivity timers started by the sender and the receiver will be out of sync, which will cause the shortcycle timers started by the sender and the receiver to be out of sync, and the DRX cycles of the sender and the receiver will be inconsistent.

For example, as shown in Figure 6, the TX UE is at the activation time during the operation of the on duration timer, and sends two SCIs, namely SCI1 and SCI2. The TX UE starts the inactivity timer after sending SCI1, and starts the shortcycle timer after the inactivity timer times out. Similarly, the TX UE starts the inactivity timer after sending SCI2, and restarts the shortcycle timer after the inactivity timer times out.

During the operation of the on duration timer, the RX UE is at the activation time, successfully receives the SCI1, starts the inactivity timer, and starts the shortcycle timer when the inactivity timer times out. Due to transmission conditions and other reasons, the RX UE may fail to receive SCI2, and the RX UE fails to restart the inactivity timer and shortcycle timer. The RX UE starts the shortcycle timer only once, and when the started shortcycle timer times out, the RX UE enters the DRX long cycle. At this time, the TX UE is still in the short DRX cycle. It can be seen that due to reasons such as the transmission failure of the SCI, the DRX cycle of the TX UE and the RX UE may be inconsistent.

In view of the above, the embodiment of the present application provides a solution, the method includes: when the RX UE needs to switch from the DRX short cycle to the DRX long cycle, the RX UE can send first information to the TX UE, the HARQ of the first information. property is enabled. When the TX UE receives the above-mentioned first information, it can determine whether to allow the RX UE to enter the DRX long cycle, or it can reply whether the RX UE knows that it wants to enter the DRX long cycle. If agreed, or the replying RX UE is informed that it wants to enter the DRX long cycle, the TX UE may send HARQ feedback of ACK to the RX UE. When the RX UE receives the HARQ feedback of the above ACK, it switches from the DRX short cycle to the DRX long cycle. Optionally, when the TX UE sends the HARQ feedback of the ACK, the TX UE can switch from the DRX short cycle to the DRX long cycle synchronously.

As shown in FIG. 7 , a process flow of a sidelink communication method is provided, which at least includes the following steps:

Step 700: The second terminal device sends first information to the first terminal device, the HARQ attribute of the first information is enabled, and the HARQ attribute being enabled indicates that the first terminal device, when receiving the first information, sends the first information to the first terminal device. The second terminal device sends HARQ feedback of the first information.

Step 701: The first terminal device sends the HARQ feedback of the first information to the second terminal device, and when the HARQ feedback is ACK, the first terminal device uses the DRX long cycle.

Step 702: The second terminal device receives HARQ feedback of the first information from the first terminal device, and the HARQ feedback is ACK, and the second terminal device uses the DRX long cycle.

Optionally, when the HARQ feedback is NACK, the first terminal device and/or the second terminal device may keep using the current DRX cycle. In a possible implementation manner, when the first terminal device receives the above-mentioned first information, the first terminal device may determine whether to allow the second terminal device to use the DRX long cycle. If agreed, the first terminal device sends an ACK. If not agreed, the first terminal device sends NACK; correspondingly, when the second terminal device receives the ACK, the second terminal device uses the DRX long cycle. Alternatively, when the second terminal device receives the NACK, the second terminal device continues to maintain the current DRX cycle. In a possible implementation manner, when the second terminal device receives the NACK, if the second terminal device currently uses the DRX short cycle, the second terminal device continues to use the DRX short cycle. Similarly, if the second terminal device currently uses the DRX long cycle, the second terminal device continues to use the DRX long cycle and so on.

Exemplarily, in this embodiment of the present application, the second terminal device may be an RX UE, and the first terminal device may be a TX UE. When the RX UE satisfies the condition of switching from the DRX short cycle to the DRX long cycle, for example, the condition may be that the shortcycle timer times out, the RX UE performs the process of the above step 700, and sends the first information to the TX UE. Optionally, the first information may be used to indicate the use of the DRX long cycle. In the embodiments of this application, regarding "using the DRX long cycle", the following description is made: In a possible implementation manner, the TX UE or the RX UE is currently in the DRX short cycle, and the above-mentioned use of the DRX long cycle may refer to the TX UE or the RX UE The UE switches from the DRX short cycle to the DRX long cycle. Or, in another possible implementation manner, the TX UE or the RX UE is currently in the DRX long cycle, and the above-mentioned use of the DRX long cycle may mean that the TX UE or the RX UE continues to remain in the DRX long cycle, etc.

Exemplarily, in this embodiment of the present application, the above-mentioned first information may be carried in a media access control control element (media access control control element, MAC CE). Optionally, the foregoing first information may further include indication information of the first link. There may be two links between the first terminal device and the second terminal device, namely the first link and the second link. Wherein, in the first link, the first terminal device is used as a sending end, and the second terminal device is used as a receiving end, and the first terminal device can send SL data information or SL control information and the like to the second terminal device. In the second link, the first terminal device acts as a receiving end, and the second terminal device acts as a transmitting end, and the second terminal device can send SL data information or SL control information and the like to the first terminal device. It can be known from the above description that the first information is specifically used to indicate that the DRX long cycle is used in the first link. Therefore, the first information may carry the indication information of the first link. Exemplarily, the indication information of the first link may include a pair of destination identifiers and source identifiers, where the destination identifier is the identifier of the receiver, the source identifier is the identifier of the sender, or the identifier of the first link, or the connection identifier of the first link. etc., without limitation. In a possible implementation manner, the above-mentioned pair of destination identifier and source identifier may be described in the following manner: {DST ID, SRC ID}. Among them, "DST ID" represents the destination ID, and the full name can be destination ID, and "SRC ID" represents the source ID, and the full name can be source ID.

It should be pointed out that, in the above-mentioned process shown in FIG. 7 , the time for which the first terminal device and/or the second terminal device uses the DRX long cycle is not limited. The second terminal device may use the DRX long cycle when or after receiving the ACK feedback. For example, in the example shown in FIG. 8 , taking the second terminal device as an RX UE as an example, after the RX UE starts the on duration timer for the first time after receiving the ACK feedback, the DRX long cycle is used. The same is true for the first terminal device, the first terminal device can use the DRX long cycle when sending ACK feedback; or, the first terminal device can use the DRX long cycle at any time after sending the ACK feedback, etc., as long as the TX UE is guaranteed It can be consistent with the DRX long cycle start time between the RX UEs. The specific time may be protocol rules, or pre-configured, etc., and is not limited.

For the sidelink communication method provided in FIG. 7, as shown in FIG. 8, a specific example is provided, including at least:

When the RX UE meets the conditions for switching from the DRX short cycle to the DRX long cycle, such as when the shortcycle timer times out, the RX UE sends a MAC CE to the TX UE, and the HARQ attribute of the MAC CE is enabled. When the TX UE receives the above MAC CE and sends ACK, it performs DRX switching, that is, switching from DRX short cycle to DRX long cycle. Correspondingly, when the RX UE receives the above-mentioned ACK, it performs DRX switching, that is, switching from the DRX short cycle to the DRX long cycle. specific:

For an SL transmission pair (pair), if the RX UE meets the conditions for entering the DRX long cycle, the RX UE triggers the MAC CE, and the HARQ attribute of the MAC CE is enabled. When the TX UE receives the MAC CE, it can agree to enter the DRX long cycle, then the TX UE can send ACK to the RX UE, and the TX UE enters the DRX long cycle. Correspondingly, when the RX UE receives the above-mentioned ACK, the RX UE can enter the DRX long cycle.

The following description is made about the SL transmission pair: any two terminal devices communicating with SL can form a transmission pair. For example, UE1 and UE2 perform SL communication, then UE1 and UE2 may form an SL transmission pair. Each SL transmission pair may include 2 links. For example, in the first link, UE1 acts as a transmitter and UE2 acts as a receiver. In the second link, UE2 can be used as a transmitter, and UE1 can be used as a receiver. Optionally, the MAC CE can carry the identification information of the control link. For example, if the MAC CE is used to control the DRX switching of the above-mentioned first link, the above-mentioned MAC CE may carry the identification information of the first link. Alternatively, if the MAC CE is used to control the DRX switching of the second link, the MAC CE may carry the identification information of the second link. Optionally, the identification information of the above link may specifically be a pair of destination identification and source identification, and the pair of destination identification and source identification may be expressed as {DST ID, SRC ID}. The destination identifier is the identifier of the UE serving as the receiver, and the source identifier may be the identifier of the UE serving as the sender.

It can be seen from the above description that using the method in this embodiment of the present application, for one SL transmission pair, when the receiving end UE meets the conditions for performing DRX cycle switching, it can send the MAC CE to the sending end UE, if the sending end UE agrees When the DRX cycle is switched, the entire SL link follows the DRX pattern (pattern) of the UE at the receiving end. E.g:

If UE1 acts as a TX UE and UE2 acts as an RX UE, the link can be called link 1, and the link 1 follows the DRX pattern of the receiving end UE2. or,

If UE2 acts as a TX UE and UE1 acts as an RX UE, the link can be called link 2, and the link 2 follows the DRX pattern of the receiving end UE1.

It can be seen that in the embodiment of the present application, the DRX cycle switching between the TX UE and the RX UE can be controlled through the MAC CE, regardless of whether the shortcycle timer times out, so that the DRX cycle between the TX UE and the RX UE can be aligned.

The embodiment of the present application also provides a sidelink communication method, which can also solve the problem that the DRX cycles of the TX UE and the RX UE are inconsistent. In the method shown in FIG. 7 above, the RX UE sends the first information to the TX UE when the condition for switching from the DRX short cycle to the DRX long cycle is satisfied. In this method, the TX UE sends the second information to the RX UE when the conditions for switching from the DRX long cycle to the DRX short cycle are met, so as to ensure that the DRX cycles of the TX UE and the RX UE are consistent.

As shown in FIG. 9, a flow of a sidelink communication method is provided, including at least:

Step 900: The first terminal device sends second information to the second terminal device, the HARQ attribute of the second information is enabled, and the HARQ attribute being enabled indicates that when the second terminal device receives the second information, Sending HARQ feedback of the second information to the first terminal device.

In a possible implementation manner, the second terminal device acts as the receiving end, and when receiving the second information, can determine whether to agree to use the DRX short cycle, or can determine whether to reply that it has learned that the first terminal device wants to use the DRX short cycle DRX short cycle. If the second terminal device determines that the DRX short cycle can be used, the second terminal device can send an ACK to the first terminal device; otherwise, the second terminal device sends a NACK to the first terminal device. Correspondingly, when the first terminal device receives the ACK, the first terminal device may use the DRX short cycle. Alternatively, when the first terminal device receives the NACK, the first terminal device may continue to enable the current DRX cycle without making changes. Similarly, when the second terminal device sends an ACK, the second terminal device uses the short DRX cycle; when the second terminal device sends a NACK, the second terminal device keeps using the current DRX cycle, which is not limited.

Step 901: The second terminal device sends HARQ feedback of the second information to the first terminal device, and the HARQ feedback is ACK, and the second terminal device uses the DRX short cycle.

Step 902: The first terminal device receives HARQ feedback of the second information from the second terminal device, and the HARQ feedback is ACK, and the first terminal device uses the DRX short cycle.

Optionally, in this process, the first terminal device may be a TX UE, and the second terminal device may be an RX UE. The above-mentioned second information may indicate that the DRX short cycle is used. In the embodiment of this application, the following description is made about using the DRX short cycle: if the TX UE or RX UE is currently in the DRX long cycle, the DRX short cycle is used, which may refer to the TX UE or RX UE switching from the DRX long cycle to the DRX short cycle . Alternatively, if the TX UE or the RX UE is currently in the DRX short cycle, the DRX short cycle is used, which may mean that the TX UE or the RX UE continues to remain in the DRX short cycle.

Exemplarily, in this embodiment of the present application, the second information may be carried in the MAC CE. Optionally, the second information may carry indication information of the first link. In the first link, the first terminal device is the sending end, the second terminal device is the receiving end, and the first terminal device can send the The second terminal device sends SL data information or SL control information and the like. Optionally, the indication information of the first link includes a pair of destination identification and source identification, the destination identification is the identification of the receiving end, and the source identification is the identification of the transmitting end, or the identification of the first link, or the identification of the first link. Connection identification, etc., are not limited. For the pair of the destination identifier and the source identifier, reference may be made to the above-mentioned introduction in FIG. 7 , which will not be repeated here.

The embodiment of the present application also provides a sidelink communication method, which can also solve the problem that the DRX cycles of the TX UE and the RX UE are inconsistent. The method includes: the TX UE only sends the SCI whose HARQ attribute is enabled during the long-period on-duration period.

As shown in FIG. 10 , a flow of a sidelink communication method is provided, including at least:

Step 1000: During the activation period of the DRX long cycle, the first terminal device only sends an SCI whose HARQ attribute is enabled to the second terminal device, and the HARQ attribute being enabled indicates that the second terminal device is receiving the SCI or SCI. When the SL data is scheduled, the HARQ feedback of the SCI or the SL data scheduled by the SCI is sent to the first terminal device.

Step 1001: The first terminal device starts or restarts the inactivity timer when sending the HARQ feedback of the SL data scheduled by the SCI or the SCI to the second terminal device, and when the inactivity timer times out, the first terminal device uses the DRX short cycle.

Step 1002: the first terminal device starts or restarts the inactivity timer when receiving the HARQ feedback of the SL data scheduled by the SCI or the SCI from the second terminal device, and when the inactivity timer times out, the first terminal device uses the DRX short cycle.

Through the aforementioned analysis, when the DRX cycle of the TX UE and the RX UE is inconsistent, it can be seen that the DRX cycle of the TX UE and the RX UE is inconsistent, mainly due to the SCI sent by the TX UE and the failure of the RX UE to receive, resulting in the failure of the RX UE to receive. The inactivity timer is not started; when the inactivity timer times out, the RX UE also does not start the shortcycle timer. In the embodiment of the present application, the TX UE only sends the SCI whose HARQ attribute is enabled during the activation time of the DRX long period. When the TX UE receives the HARQ feedback of the SCI or the SL data scheduled by the SCI, the Start or restart the inactivity timer. While the RX UE starts or restarts the inactivity timer when sending the HARQ feedback of the SCI or the SL data scheduled by the SCI. In this way, the inactivity timers of the TX UE and the RX UE are started synchronously, so that the shortcycle timers of the two are started synchronously, and the TX UE and the RX UE are switched to the DRX short cycle synchronously.

In a possible implementation manner, in the flow shown in Figure 10 above, the TX UE sends only the HARQ-enabled SCI during the long-cycle on-duration period. Both the TX UE and the RX UE can start the shortcycle timer synchronously and enter the DRX short cycle. However, when the TX UE does not send the SCI of the HARQ enabled attribute during the on duration of the long cycle, or when the RX UE does not receive the SCI of the HARQ enabled, both the TX UE and the RX UE may not be able to enter the DRX short cycle. In view of the above situation, the TX UE and the TX UE can switch from the DRX long cycle to the DRX short cycle through the second information shown in FIG. 9 above.

The following continues to introduce the timers in SL DRX: discontinuous reception round trip timer (discontinuous reception round trip timer, DRX-RTT timer) and discontinuous reception retransmission timer (discontinuous reception retransmission timer, DRX-ReTx timer). The DRX-RTT timer can also be referred to as sl-drx-HARQ-RTT-Timer, and in the following description, is referred to as RTT timer for short. RTT timer is used to indicate the minimum length of time before the resource configuration information or authorization information expected to be used for SL retransmission reaches the receiving end, that is to say, the value of RTT timer can be "resource configuration information or authorization information expected to be used for SL retransmission. The minimum length before reaching the receiving end. The DRX-ReTX timer can also be referred to as sl-drx-RetransmissionTimer, hereinafter referred to as ReTx timer.ReTx timer is used to indicate that the receiving end receives the resource configuration information or authorization information of SL retransmission. The maximum duration, that is to say, the value of the ReTx timer can be "the maximum duration until the resource configuration information or authorization information retransmitted by the SL is received". During the operation of the ReTx timer, the UE is in the active time.

In a possible implementation manner, as shown in Figure 11, for the SCI whose HARQ attribute is enabled and disabled, a set of RTT timer and ReTx timer are respectively configured. For example, configure RTT timer1 and ReTx timer1 for SCI enabled for HARQ attribute. Configure RTT timer2 and ReTx timer2 for SCI with HARQ attribute disabled. It should be noted that, in Figure 11, "d" is used to indicate that the HARQ attribute is an enabled SCI, "e" is used to indicate that the HARQ attribute is a disabled SCI, and "x" is used to indicate that the RX UE has not successfully received the SCI. The HARQ attribute of the SCI is not limited.

As shown in Figure 11, for an SCI whose HQRQ attribute is disabled, the TX UE starts or restarts the RTT timer1 when sending the SCI, and starts the ReTx timer1 when the RTT timer1 times out. Due to the failure of the transmission link and other reasons, if the RX UE does not receive the SCI, the RX UE does not start or restarts the corresponding RTTtimer1 and ReTxtimer1, causing the RTTtimer and ReTxtimer started by the TX UE and the RX UE to be out of synchronization. For an SCI whose HARQ attribute is enabled, the TX UE starts RTT timer2 and ReTx timer2 when receiving the HARQ feedback of the enabled SCI, or the TX UE starts the first time unit after the HARQ feedback resources of the enabled SCI Start RTT timer2, when RTT timer2 times out, if HARQ feedback is received, then ReTx timer2 is started; RX UE starts RTT timer2 and ReTx timer2 when sending HARQ feedback of enabled SCI, which ensures that TX UE and RX UE start RTT timer and ReTxtimer are aligned.

It can be seen from the above analysis that for the SCI transmission with the HARQ attribute disabled, it is very likely that the RTT timer and the ReTx timer between the TX UE and the RX UE are not aligned, and the activation time is not synchronized. For example, if the enabled transmission is performed between the TX UE and the RX UE during the operation of the ReTx timer whose attribute is disabled, that is, the ReTx timer1, the following situation is likely to occur: During the operation of the ReTx timer1 of the TX UE, When the TX UE is in the active time, the TX UE sends the SL information or data whose HARQ attribute is enabled to the RX UE. However, the ReTX timer1 of the RX UE is not running, the RX UE is in sleep time, and the RX UE fails to receive the above SL information or data, so the RX UE cannot feed back the HARQ feedback of the SL information or data, which may cause the TX UE to fail to receive The HARQ attribute is the HARQ feedback of the enabled SL information or data, thereby triggering the SL radio link failed (radio link failed, RLC).

Based on the above, the embodiments of the present application propose the following solutions: when the DRX between the TX UE and the RX UE is at the activation time, and currently only the ReTX timer whose HARQ attribute is disabled is running, the connection between the TX UE and the RX UE is no longer available. Carrying out the transmission with the HARQ attribute enabled can avoid the problem of triggering SL RLF because the TX UE does not receive the HARQ feedback from the RX UE after sending the SL information or data with the HARQ attribute enabled.

As shown in FIG. 12 , a flow of a sidelink communication method is provided, including at least:

Step 1200: The DRX between the first terminal equipment and the second terminal equipment is at the activation time, and only the ReTx timer whose HARQ attribute is disabled is running, and the HARQ attribute is disabled indicates that the second terminal equipment is on When the information corresponding to the ReTx timer is received, the HARQ feedback corresponding to the information is sent to the first terminal device.

The following description is made about the ReTx timer whose HARQ attribute is disabled: Through the introduction of Figure 11 above, it can be seen that a set of RTT timer and ReTx timer are respectively configured for the SCI whose HARQ attribute is enabled and the SCI whose HARQ attribute is disabled. Regarding the ReTx timer whose HARQ attribute is disabled, it may refer to the ReTx timer configured for the SCI whose HARQ attribute is disabled, that is, ReTx timer2.

Step 1201: Perform transmission between the first terminal equipment and the second terminal equipment with the HARQ attribute being disabled, and the HARQ attribute being disabled indicates that the second terminal equipment does not disable the transmission when receiving the information corresponding to the transmission. Send HARQ feedback of the information to the first terminal device. Alternatively, no SL transmission is performed between the first terminal device and the second terminal device.

Optionally, the above-mentioned transmission in which the HARQ attribute is disabled is performed between the first terminal device and the second terminal device, and may be replaced by: only transmission in which the HARQ attribute is disabled is performed between the first terminal device and the second terminal device. , and/or, no transmission with the HARQ attribute being enabled is performed between the first terminal device and the second terminal device.

In a possible implementation manner, a specific implementation of the above-mentioned transmission in which the HARQ attribute is disabled between the first terminal device and the second terminal device may be: the first terminal device does not transmit the HARQ attribute to the second terminal device. The device sends a new transmission whose HARQ attribute is enabled, and/or the first terminal device sends a new transmission or retransmission whose HARQ attribute is disabled to the second terminal device. It should be indicated that, in this embodiment of the present application, there is no limitation on whether retransmission with the HARQ attribute being enabled is performed between the first terminal device and the second terminal device. For example, the first terminal device may send retransmissions with the HARQ attribute enabled to the second terminal device, or the first terminal device may not send retransmissions with the HARQ attribute enabled to the second terminal device, and the like.

Exemplarily, the above-mentioned first terminal device not sending a new transmission with the HARQ attribute as enabled to the second terminal device includes: the first terminal device only multiplexes the HARQ attribute as off for the authorized grant corresponding to the new transmission. An enabled logical channel (logical channel, LCH); or, the first terminal device clears the authorization corresponding to the new transmission. The authorizations corresponding to the above-mentioned new transmissions include at least the following two types: the first one, it has not been determined that the authorization is used for a certain transport block (transport block, TB) block or a media access control element protocol data unit (media access control protocol data unit). data unit, MAC PDU); second, it has been determined that the grant is for a certain TB block or MAC PDU, etc.

Optionally, in this embodiment of the present application, the new transmission includes a new transport block TB, or an SCI indicating a new transmission, that is, a new transmission indicated by the SCI; the retransmission includes a retransmission TB, or an SCI indicating a retransmission, That is, the retransmission indicated by the SCI, etc.

Optionally, the process shown in FIG. 12 further includes: Step 1202: When the transmission between the first terminal device and the second terminal device in which the HARQ attribute is disabled ends, the first terminal device A terminal device stops the transmission of the ReTx timer corresponding to the SL process. When the transmission whose HARQ attribute is disabled is ended, it may include: the transmission whose current HARQ attribute is disabled reaches the maximum number of retransmissions, or the first terminal device receives a new transmission schedule from the network device, or the first terminal device Reach the next cycle of configured grant (CG), etc. The following description is made about the CG: the CG refers to that the uplink transmission of the terminal device does not require scheduling by the network device, and the terminal device performs the uplink transmission according to the configuration information. In the embodiment of the present application, the first terminal device, as the sending end UE, can feed back the HARQ feedback of the SL to the network device according to the uplink transmission resources configured by the CG. That is to say, in a possible implementation manner, when the UE at the transmitting end receives the SL HARQ feedback from the UE at the receiving end, the UE at the transmitting end may also send the SL HARQ feedback to the network device according to the uplink resources configured by the CG. For example, if the SL HARQ feedback is NACK, the base station may re-allocate SL resources for SL retransmission and the like for the current SL transmission.

Taking the first terminal device as a TX UE and the second terminal device as an RX UE as an example, a specific implementation method is provided:

For example, as shown in FIG. 11 , in the example of FIG. 11 , in the time range from the second slot of (1, 6) to (1, 7), there is only disabled ReTx inside the TX UE The timer is running, please refer to the unit filled with "/" in Figure 11. During this time range, no other timers (such as on-duration timer and inactivity timer, etc.) are running. During this time, there is no communication between the TX UE and the RX UE. Perform SL transmission with HARQ attribute enabled. Optionally, the above-mentioned SL transmission with the HARQ attribute enabled is not performed between the TX UE and the RX UE, including: no new transmission of the HARQ-enabled TB is performed between the TX UE and the RX UE. The TB can be considered as a resource or the like for transmitting SL data. For the newly transmitted authorization, if the above conditions for the operation of only the disabled ReTx timer are met, the TX UE will only reuse the LCH whose attribute is HARQ disabled during the logic channel prioritization (LCP) process. ; or, clear grant, etc.

Optionally, HARQ-enabled SL transmission is not allowed between the TX UE and the RX UE, and HARQ-disabled SL transmission can be performed between the TX UE and the RX UE. When the TX UE ends the above-mentioned HARQ-disabled transmission, the TX UE can stop the ReTx timer that the SL process is running. Optionally, the above-mentioned ending transmission may include: reaching the maximum number of retransmissions, or receiving a new transmission schedule, or reaching the next cycle of the CG, and so on.

Referring to FIG. 13 , it is a schematic diagram of an apparatus 1300 according to an embodiment of the present application. The apparatus is used to implement each step performed by the first terminal device or the second terminal device in the foregoing embodiment. As shown in FIG. 13 , the apparatus 1300 includes a transceiver unit 1310 and a processing unit 1320 .

In the first embodiment, the above-mentioned apparatus 1300 may be a first terminal device or a chip in the first terminal device, then:

The transceiver unit 1310 is configured to send an SCI whose HARQ attribute is enabled to the second terminal device, where the HARQ attribute is enabled indicates that when the second terminal device receives the SCI or the SL data scheduled by the SCI, send the HARQ attribute to the second terminal device. The first terminal device sends the HARQ feedback of the SCI or the data scheduled by the SCI; the transceiver unit 1310 is further configured to receive the HARQ feedback of the SCI or the data scheduled by the SCI from the second terminal device ; The processing unit 1320 is used to start or restart the DRX-inactivity timer.

In a possible implementation manner, the processing unit 1320 is further configured to keep the DRX-inactivity timer in an inactive state when sending an SCI whose HARQ attribute is disabled to the second terminal device, and the HARQ The attribute is disabled indicates that when the second terminal device receives the SCI or the SL data scheduled by the SCI, it does not send the HARQ feedback of the SCI or the SL data scheduled by the SCI to the first terminal device .

In the second embodiment, the above-mentioned apparatus 1300 may be a second terminal device or a chip in the second terminal device, then:

The transceiver unit 1310 is configured to receive an SCI whose HARQ attribute is enabled from the first terminal device, and when the HARQ attribute is enabled indicates that the second terminal device receives the SCI or the SL data scheduled by the SCI, Send the HARQ feedback of the SCI or the data scheduled by the SCI to the first terminal device; the transceiver unit 1310 is further configured to send the HARQ of the SCI or the SL data scheduled by the SCI to the first terminal device Feedback; the processing unit 1320 is used to start or restart the DRX-inactivity timer.

In a possible implementation manner, the processing unit 1320 is further configured to keep the DRX-inactivity timer in an inactive state when receiving the SCI with the HARQ attribute being disabled from the first terminal device, so The HARQ attribute is a disabling instruction to instruct the second terminal device not to send the SCI or the SL data scheduled by the SCI to the first terminal device when receiving the SL data scheduled by the SCI or the SCI. HARQ feedback.

In the third embodiment, the above-mentioned apparatus 1300 may be the second terminal device or a chip in the second terminal device, then:

The transceiver unit 1310 is configured to send first information to the first terminal device, where the HARQ attribute of the first information is enabled, and the HARQ attribute of the enabled indicates that when the second terminal device receives the first information , sending the HARQ feedback of the first information to the first terminal device; the transceiver unit 1310 is further configured to receive the HARQ feedback of the first information from the first terminal device; the processing unit 1320 is configured to, when When the HARQ feedback is ACK, the DRX long cycle is used.

In a possible implementation manner, the first information is carried in the MAC CE.

In a possible implementation manner, the first information carries indication information of a first link, and the first link is used for the first terminal device to send SL data information or SL to the second terminal device control information, etc.

In the fourth embodiment, the above-mentioned apparatus 1300 may be the first terminal device or a chip in the first terminal device, then:

A transceiver unit 1310, configured to receive first information from a second terminal device, where the HARQ attribute of the first information is enabled, and the HARQ attribute being enabled indicates that the second terminal device receives the first information , sending the HARQ feedback of the first information to the first terminal device; the transceiver unit 1310 is further configured to send the HARQ feedback of the first information to the second terminal device; the processing unit 1320 is configured to send the HARQ feedback of the first information to the second terminal device When the HARQ feedback is ACK, it is used to use the DRX long cycle.

In a possible implementation manner, the first information carries indication information of a first link, and the first link is used for the first terminal device to send SL data information or SL to the second terminal device control information.

In the fifth embodiment, the above-mentioned apparatus 1300 may be the first terminal device or a chip in the first terminal device, then:

The transceiver unit 1310 is configured to send second information to the second terminal device, where the HARQ attribute of the second information is enabled, and the HARQ attribute of the enabled indicates that when the second terminal device receives the second information , sending the HARQ feedback of the second information to the first terminal device; the transceiver unit 1310 is configured to receive the HARQ feedback of the second information from the second terminal device; the processing unit 1320 is configured to receive the HARQ feedback of the second information from the second terminal device; When the above-mentioned HARQ feedback is ACK, the DRX short cycle is used.

In a possible implementation manner, the second information is carried in the MAC CE.

In a possible implementation manner, the second information carries indication information of a first link, and the first link is used for the first terminal device to send SL data information or SL to the second terminal device control information, etc.

In the sixth embodiment, the above-mentioned apparatus 1300 may be a second terminal device or a chip in the second terminal device, then:

The transceiver unit 1310 is configured to receive second information from the first terminal device, where the HARQ attribute of the second information is enabled, and the HARQ attribute being enabled indicates that the second terminal device is receiving the second information. When the information is received, send the HARQ feedback of the second information to the first terminal device; the transceiver unit 1310 is further configured to send the HARQ feedback of the second information to the first terminal device; the processing unit 1320 is configured to When the HARQ feedback is ACK, the DRX short cycle is used.

In the seventh embodiment, the above-mentioned apparatus 1300 may be the first terminal device or a chip in the first terminal device, then:

The transceiver unit 1310 is configured to send only the SCI whose HARQ attribute is enabled during the activation period of the DRX long cycle, and the HARQ attribute being enabled indicates that when the second terminal device receives the SCI or the SL data scheduled by the SCI, Send the HARQ feedback of the SCI or SL data to the first terminal device; the processing unit 1320 is configured to start or restart the DRX-inactivity timer when receiving the HARQ feedback of the SCI or SL data, in the DRX -Use DRX short cycle when the inactivity timer times out.

In the eighth embodiment, the above-mentioned apparatus 1300 may be the first terminal device or a chip in the first terminal device, then:

The processing unit 1320 is configured to determine that the DRX between the first terminal device and the second terminal device is at the activation time, and only the DRX-ReTx timer whose HARQ attribute is disabled is running, and the HARQ attribute is disabled indicating that the After receiving the information corresponding to the DRX-ReTx timer, the second terminal device sends HARQ feedback corresponding to the information to the first terminal device; the transceiver unit 1310 is configured to control the first terminal device and the second terminal device When the HARQ attribute is disabled, the HARQ attribute indicates that the second terminal device does not send the HARQ of the information to the first terminal device when it receives the information corresponding to the transmission. feedback.

In a possible implementation manner, the transmitting between the first terminal device and the second terminal device that the HARQ attribute is disabled includes: the first terminal device does not send the HARQ attribute to the second terminal device For a new transmission to be enabled, and/or, the first terminal device sends a new transmission or retransmission whose HARQ attribute is disabled to the second terminal device.

In a possible implementation manner, the first terminal device does not send a new transmission whose HARQ attribute is enabled to the second terminal device, including: for the authorized grant corresponding to the new transmission, only multiplexing the HARQ attribute as disabled A valid logical channel LCH; or, clear the grant corresponding to the new transmission.

In a possible implementation manner, the new transmission includes a new transport block TB, or an SCI indicating the new transmission.

In a possible implementation manner, the processing unit 1320 is further configured to: when the transmission in which the HARQ attribute between the first terminal device and the second terminal device is disabled ends, stop the transmission corresponding to the SL process. DRX-ReTx timer.

It should be understood that the division of units in the above apparatus is only a division of logical functions, and may be fully or partially integrated into a physical entity in actual implementation, or may be physically separated. And all the units in the device can be realized in the form of software calling through the processing element; also can all be realized in the form of hardware; some units can also be realized in the form of software calling through the processing element, and some units can be realized in the form of hardware. For example, each unit can be a separately established processing element, or can be integrated in a certain chip of the device to be implemented, and can also be stored in the memory in the form of a program, which can be called by a certain processing element of the device and execute the unit's processing. Function. In addition, all or part of these units can be integrated together, and can also be implemented independently. The processing element described here can also become a processor, which can be an integrated circuit with signal processing capability. In the implementation process, each step of the above method or each of the above units may be implemented by an integrated logic circuit of hardware in the processor element or implemented in the form of software being invoked by the processing element.

In one example, a unit in any of the above apparatuses may be one or more integrated circuits configured to implement the above methods, eg, one or more application specific integrated circuits (ASICs), or, one or more Multiple microprocessors (digital singnal processors, DSPs), or, one or more field programmable gate arrays (FPGAs), or a combination of at least two of these integrated circuit forms. For another example, when a unit in the apparatus can be implemented in the form of a processing element scheduler, the processing element can be a general-purpose processor, such as a central processing unit (central processing unit, CPU) or other processors that can invoke programs. For another example, these units can be integrated together and implemented in the form of a system-on-a-chip (SOC).

The above transceiver unit 1310 is an interface circuit of the device, and is used to receive signals from or send signals to other devices. For example, when the device is implemented in the form of a chip, the transceiver unit 1310 is an interface circuit used by the chip to receive signals from other chips or devices, or an interface circuit to send signals to other chips or devices.

Referring to FIG. 14 , it is a schematic diagram of an apparatus provided by an embodiment of the present application. It is used to implement the operation of the first terminal device or the second terminal device in the above method embodiments. As shown in FIG. 14 , the apparatus includes: a processor 1410 and an interface 1430 . Optionally, the apparatus may further include a memory 1420 . The interface 1430 is used to enable communication with other devices.

In the above embodiments, the methods performed by the first terminal device and the second terminal device may be invoked by the processor 1410 in the memory (which may be the first terminal device, the second terminal device, the memory 1420 in the terminal device, or an external memory) stored procedures. That is, the first terminal device, the second terminal device, or the terminal device may include a processor 1410, and the processor 1410 executes the method performed by the first terminal device and the second terminal device in the above method embodiments by invoking the program in the memory . The processor here may be an integrated circuit with signal processing capability, such as a CPU. The first terminal device or the second terminal device may be implemented by one or more integrated circuits configured to implement the above method. For example: one or more ASICs, or, one or more microprocessor DSPs, or, one or more FPGAs, etc., or a combination of at least two of these integrated circuit forms. Alternatively, the above implementations may be combined.

Specifically, the functions/implementation process of the transceiver unit 1310 and the processing unit 1320 in FIG. 13 can be implemented by the processor 1410 in the apparatus 1400 shown in FIG. 14 calling computer executable instructions stored in the memory 1420 . Alternatively, the function/implementation process of the processing unit 1310 in FIG. 13 can be implemented by the processor 1410 in the apparatus 1400 shown in FIG. 14 calling the computer-executed instructions stored in the memory 1420, and the function/ The realization process can be realized through the interface 1430 in the apparatus 1400 shown in FIG. 14 .

It should be understood that, in the various embodiments of the present application, the size of the sequence numbers of the above-mentioned processes does not mean the sequence of execution, and the execution sequence of each process should be determined by its functions and internal logic, and should not be dealt with in the embodiments of the present invention. implementation constitutes any limitation.

The present application also provides a computer-readable medium on which a computer program is stored, and when the computer program is executed by a computer, implements the functions of any of the foregoing method embodiments.

The present application also provides a computer program product, which implements the functions of any of the above method embodiments when the computer program product is executed by a computer.

Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the above-described systems, devices and units may refer to the corresponding processes in the foregoing method embodiments, which will not be repeated here.

In the above-mentioned embodiments, it may be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented in software, it can 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. When the computer program instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of the present application are generated. The computer may be a general purpose computer, special purpose computer, computer network, or other programmable device. The computer instructions may be stored in or transmitted from one computer readable storage medium to another computer readable storage medium, for example, the computer instructions may be downloaded from a website site, computer, server or data center Transmission to another website site, computer, server, or data center is by wire (eg, coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (eg, infrared, wireless, microwave, etc.). The computer-readable storage medium may be any available medium that a computer can access, or a data storage device such as a server, a data center, or the like that includes an integration of one or more available media. The usable media may be magnetic media (eg, floppy disks, hard disks, magnetic tapes), optical media (eg, DVDs), or semiconductor media (eg, solid state disks (SSDs)), and the like.

The various illustrative logic units and circuits described in the embodiments of this application may be implemented by general purpose processors, digital signal processors, application specific integrated circuits (ASICs), field programmable gate arrays (FPGAs) or other programmable logic devices, Discrete gate or transistor logic, discrete hardware components, or any combination of the above are designed to implement or operate the described functions. A general-purpose processor may be a microprocessor, or alternatively, the general-purpose processor may be any conventional processor, controller, microcontroller, or state machine. A processor may also be implemented by a combination of computing devices, such as a digital signal processor and a microprocessor, multiple microprocessors, one or more microprocessors in combination with a digital signal processor core, or any other similar configuration. accomplish.

The steps of the method or algorithm described in the embodiments of this application may be directly embedded in hardware, a software unit executed by a processor, or a combination of the two. Software units can be stored in random access memory (RAM), flash memory, read-only memory (ROM), EPROM memory, EEPROM memory, registers, hard disk, removable disk, CD-ROM or this In any other form of storage media in the field. Illustratively, a storage medium may be coupled to the processor such that the processor may read information from, and store information in, the storage medium. Optionally, the storage medium can also be integrated into the processor. The processor and storage medium may be provided in the ASIC.

These computer program instructions can also be loaded on a computer or other programmable data processing device to cause a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process such that The instructions provide steps for implementing the functions specified in the flow or blocks of the flowcharts and/or the block or blocks of the block diagrams.

In one or more exemplary designs, the above-described functions described herein may be implemented in hardware, software, firmware, or any combination of the three. If implemented in software, the functions may be stored on, or transmitted over, a computer-readable medium in the form of one or more instructions or code. Computer-readable media includes computer storage media and communication media that facilitate the transfer of a computer program from one place to another. Storage media can be any available media that a general-purpose or special-purpose computer can access. For example, such computer-readable media may include, but are not limited to, RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other device that can be used to carry or store instructions or data structures and Other media in the form of program code that can be read by a general-purpose or special-purpose computer, or a general-purpose or special-purpose processor. In addition, any connection is properly defined as a computer-readable medium, for example, if software is transmitted from a website site, server or other remote source over a coaxial cable, fiber optic computer, twisted pair, digital subscriber line (DSL) Or transmitted by wireless means such as infrared, wireless, and microwave are also included in the definition of computer-readable media. The discs and discs include compact discs, laser discs, optical discs, digital versatile discs (DVDs), floppy discs and Blu-ray discs. Disks usually reproduce data magnetically, while discs usually use Lasers make optical copies of data. Combinations of the above can also be included in computer readable media.

Those skilled in the art should appreciate that, in one or more of the above examples, the functions described in this application may be implemented in hardware, software, firmware, or any combination thereof. When implemented in software, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A storage medium can be any available medium that can be accessed by a general purpose or special purpose computer.

The specific embodiments described above further describe the purpose, technical solutions and beneficial effects of the present application in detail. It should be understood that the above descriptions are only specific embodiments of the present application, and are not intended to limit the The protection scope, any modifications, equivalent replacements, improvements, etc. made on the basis of the technical solutions of the present application shall be included within the protection scope of the present application. The above description of the specification of this application can enable any skilled in the art to utilize or realize the content of this application, and any modifications based on the disclosed content should be considered obvious in the art, and the basic principles described in this application can be applied to other modifications without departing from the spirit and scope of the invention of the present application. Thus, the present disclosure is not intended to be limited only to the embodiments and designs described, but can be extended to the fullest extent consistent with the principles of this application and the novel features disclosed.

Although the application has been described in conjunction with specific features and embodiments thereof, it will be apparent that various modifications and combinations can be made therein without departing from the spirit and scope of the application. Accordingly, this specification and drawings are merely exemplary illustrations of the application as defined by the appended claims, and are deemed to cover any and all modifications, variations, combinations or equivalents within the scope of this application. Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

A sidelink communication method, comprising:

The first terminal device sends the hybrid automatic repeat request (HARQ) attribute to the second terminal device to enable the sidelink control information SCI, where the HARQ attribute is enabled indicates that the second terminal device has received the SCI or all When the sidelink SL data scheduled by the SCI is sent, the HARQ feedback of the SCI or the data scheduled by the SCI is sent to the first terminal device;

The first terminal device receives HARQ feedback of the SCI or the data scheduled by the SCI from the second terminal device, and the first terminal device starts or restarts a discontinuous reception inactivity timer.
The method of claim 1, further comprising:

The first terminal device sends an SCI whose HARQ attribute is disabled to the second terminal device, the first terminal device keeps the discontinuous reception inactivity timer in an inactive state, and the HARQ attribute is disabled. It is enabled to indicate that when the second terminal device receives the SCI or the SL data scheduled by the SCI, HARQ feedback of the SCI or the SL data scheduled by the SCI is not sent to the first terminal device.
A sidelink communication method, comprising:

The second terminal device receives the hybrid automatic repeat request from the first terminal device. The HARQ attribute is enabled sidelink control information SCI, and the HARQ attribute is enabled indicates that the second terminal device has received the SCI or When the sidelink SL data is scheduled by the SCI, send HARQ feedback of the SCI or the data scheduled by the SCI to the first terminal device;

The second terminal device sends the HARQ feedback of the SCI or the SL data scheduled by the SCI to the first terminal device, and the second terminal device starts or restarts a discontinuous reception inactivity timer.
The method of claim 3, further comprising:

The second terminal device receives an SCI whose HARQ attribute is disabled from the first terminal device, the second terminal device keeps the discontinuous reception inactivity timer in an inactive state, and the HARQ attribute is Disabling indicates that when the second terminal device receives the SCI or the SL data scheduled by the SCI, HARQ feedback of the SCI or the SL data scheduled by the SCI is not sent to the first terminal device.
A sidelink communication method, comprising:

The first terminal device determines that the discontinuous reception DRX between the first terminal device and the second terminal device is at the activation time, and only the discontinuous reception retransmission timer with the HARQ attribute of the hybrid automatic repeat request (HARQ) disabled is running, and the HARQ attribute is disabling instructing the second terminal device to send HARQ feedback corresponding to the information to the first terminal device when receiving the information corresponding to the DRX retransmission timer;

The HARQ attribute is disabled transmission between the first terminal device and the second terminal device, and the HARQ attribute is disabled indicates that when the second terminal device receives the information corresponding to the transmission, HARQ feedback of this information is not sent to the first terminal device.
The method according to claim 5, wherein the transmission with the HARQ attribute being disabled between the first terminal device and the second terminal device comprises:

The first terminal device does not send a new transmission whose HARQ attribute is enabled to the second terminal device, and/or,

The first terminal device sends, to the second terminal device, a new transmission or retransmission whose HARQ attribute is disabled.
The method according to claim 6, wherein the first terminal device does not send a new transmission whose HARQ attribute is enabled to the second terminal device, comprising:

The first terminal device multiplexes only the logical channel LCH whose HARQ attribute is disabled for the grant corresponding to the new transmission; or,

The first terminal device clears the authorization corresponding to the new transmission.
The method according to claim 6 or 7, wherein the new transmission includes a new transport block TB, or sidelink control information SCI indicating the new transmission.
The method of any one of claims 6 to 8, wherein the retransmission comprises a retransmission TB, or an SCI indicating a retransmission.
The method of any one of claims 5 to 9, further comprising:

When the transmission between the first terminal device and the second terminal device in which the HARQ attribute is disabled ends, the first terminal device stops the discontinuous reception and retransmission of the sidelink SL process corresponding to the transmission timer.
A side link communication device, comprising:

A transceiver unit, configured to send a hybrid automatic repeat request (HARQ) attribute to the second terminal device to enable the sidelink control information SCI, where the HARQ attribute is enabled indicates that the second terminal device receives the SCI or When the sidelink SL data is scheduled by the SCI, send HARQ feedback of the SCI or the data scheduled by the SCI to the first terminal device;

The transceiver unit is further configured to receive HARQ feedback of the SCI or the data scheduled by the SCI from the second terminal device;

The processing unit is used to start or restart the DRX inactivity timer.
The apparatus of claim 11, wherein

The transceiver unit is further configured to send an SCI whose HARQ attribute is disabled to the second terminal device, the first terminal device keeps the discontinuous reception inactivity timer in an inactive state, and the HARQ attribute In order to disable the instruction, when the second terminal device receives the SCI or the SL data scheduled by the SCI, the HARQ feedback of the SCI or the SL data scheduled by the SCI is not sent to the first terminal device.
A side link communication device, comprising:

A transceiver unit, configured to receive the HARQ attribute of the HARQ from the first terminal equipment is enabled sidelink control information SCI, the HARQ attribute being enabled indicates that the second terminal equipment receives the SCI or when the SCI-scheduled sidelink SL data is used, sending HARQ feedback of the SCI or the SCI-scheduled data to the first terminal device;

The processing unit is configured to start or restart a discontinuous reception inactivity timer when sending the HARQ feedback of the SCI or the SL data scheduled by the SCI to the first terminal device.
The apparatus of claim 13, wherein:

The processing unit is further configured to keep the discontinuous reception inactivity timer in an inactive state when receiving an SCI whose HARQ attribute is disabled from the first terminal device, and the HARQ attribute is disabled. It is enabled to indicate that when the second terminal device receives the SCI or the SL data scheduled by the SCI, HARQ feedback of the SCI or the SL data scheduled by the SCI is not sent to the first terminal device.
A side link communication device, comprising:

a processing unit, configured to determine that the DRX with the second terminal device is at the active time, and only the HARQ attribute of the HARQ request is disabled and the DRX timer is running, and the HARQ The attribute being disabled indicates that when the second terminal device receives the information corresponding to the DRX retransmission timer, it controls the transceiver unit to send the HARQ feedback corresponding to the information to the first terminal device;

The processing unit is further configured to perform transmission between the first terminal equipment and the second terminal equipment with the HARQ attribute being disabled, where the HARQ attribute being disabled indicates that the second terminal equipment is receiving the transmission corresponding information, the HARQ feedback of the information is not sent to the first terminal device.
The apparatus according to claim 15, wherein the transmission with the HARQ attribute being disabled between the first terminal equipment and the second terminal equipment comprises:

The first terminal device does not send a new transmission whose HARQ attribute is enabled to the second terminal device, and/or,

The first terminal device sends, to the second terminal device, a new transmission or retransmission whose HARQ attribute is disabled.
The apparatus according to claim 16, wherein the first terminal device does not send a new transmission whose HARQ attribute is enabled to the second terminal device, comprising:

The first terminal device multiplexes only the logical channel LCH whose HARQ attribute is disabled for the grant corresponding to the new transmission; or,

The first terminal device clears the authorization corresponding to the new transmission.
The apparatus of claim 16 or 17, wherein the new transmission includes a new transport block TB, or sidelink control information SCI indicating the new transmission.
The apparatus of any one of claims 16 to 18, wherein the retransmission comprises a retransmission TB, or an SCI indicating a retransmission.
The device of any one of claims 15 to 19, wherein:

The processing unit is further configured to stop the discontinuous reception and retransmission of the sidelink SL process corresponding to the transmission when the transmission in which the HARQ attribute between the first terminal device and the second terminal device is disabled ends. timer.
A side link communication device, characterized in that it comprises a processor and a memory, wherein the memory stores instructions, and when the processor executes the instructions, the device causes the device to execute the method according to claim 1 or 2. method, or perform the method of any one of claims 5 to 10.
A side link communication device, characterized in that it comprises a processor and a memory, wherein the memory stores instructions, and when the processor executes the instructions, the device causes the device to execute the method according to claim 3 or 4. method.
A computer-readable storage medium, characterized in that the computer-readable storage medium stores an instruction, when it is run on a computer, the computer is made to execute the method of claim 1 or 2, or to execute the method of claim 5 The method of any one of to 10.
A computer-readable storage medium, characterized in that the computer-readable storage medium stores instructions that, when executed on a computer, cause the computer to execute the method of claim 3 or 4.