CN116017667A

CN116017667A - Method and apparatus for side-link communication

Info

Publication number: CN116017667A
Application number: CN202111228885.7A
Authority: CN
Inventors: 李翔宇; 彭文杰
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2021-10-21
Filing date: 2021-10-21
Publication date: 2023-04-25
Also published as: WO2023066175A1

Abstract

The application provides a method for side-link communication, wherein a transmitting terminal indicates a retransmission time threshold and/or a starting time threshold of a retransmission scheduling timer of side-link data between the transmitting terminal and a receiving terminal to the receiving terminal. In the data transmission process, the receiving terminal and the sending terminal judge whether the retransmission times of the data reach a retransmission times threshold or not, or whether the current starting times of the retransmission scheduling timers of the side uplink processes associated with SCIs corresponding to the transmitted data reach a starting times threshold or not. Under the condition that the retransmission time threshold or the starting time threshold is reached, the sending terminal and the receiving terminal do not start corresponding retransmission scheduling timers; and otherwise, the sending terminal and the receiving terminal start corresponding retransmission scheduling timers, so that the synchronization of starting or not starting the retransmission scheduling timers is realized. Thus, power consumption and degradation of the communication quality of the side uplink caused by asynchronous starting of the retransmission scheduling timer are avoided.

Description

Method and apparatus for side-link communication

Technical Field

The present application relates to the field of side-link communications, and more particularly, to a method and a communication device for side-link communications.

Background

In a wireless communication system, communication between a User Equipment (UE) and the UE may be performed directly without the aid of a network device. The link between UEs is called Sidelink (SL). Unicast, multicast and broadcast are supported on the side links. Wherein unicast and multicast communication of the sidelink support hybrid automatic repeat request (hybrid automatic repeat request, HARQ) feedback, and a physical sidelink feedback channel (physical sidelink feedback channel, PSFCH) is introduced to transmit HARQ feedback. For one transmission, the SL HARQ feedback also supports enabled and disabled, i.e., if the current transmission supports SL HARQ feedback, the SL HARQ feedback is enabled; and if the transmission does not support SL HARQ feedback, the transmission is SL HARQ feedback disabled. The known side-uplink control information (sidelink control information, SCI) includes a first level SCI (i.e., the first stage SCI) and a second level SCI (i.e., the second stage SCI). The SL HARQ feedback for one transmission is enabled or disabled, specifically indicated by the second stage SCI.

In addition, a side-uplink discontinuous reception retransmission scheduling timer (sidelink drx retransmission timer) is supported in unicast communication and multicast communication. In a side-link transmission that does not support HARQ feedback, there is no transmission of the PSFCH, or the receiving terminal does not feedback to the transmitting terminal as to whether the data was successfully decoded. This mechanism will likely cause the transmitting terminal and the receiving terminal to be unsynchronized with respect to the opening of the side-uplink discontinuous reception retransmission scheduling timer. For example, in some cases, the transmitting terminal starts the side-downlink discontinuous reception retransmission scheduling timer, while the receiving terminal does not start the side-downlink discontinuous reception retransmission scheduling timer. In other cases, the transmitting terminal does not start the side-downlink-retransmission-discontinuous-reception-scheduling timer, and the receiving terminal starts the side-downlink-discontinuous-reception-retransmission-scheduling timer.

Because the sending terminal and the receiving terminal of the side-link communication are not synchronous with the starting of the side-link discontinuous reception retransmission scheduling timer, adverse effects, such as the effect of saving power consumption of the receiving terminal, are brought about, or the quality of the side-link communication is greatly affected.

Disclosure of Invention

The present application provides a method for side-link communication, which can achieve synchronization of side-link retransmission scheduling timers of a transmitting terminal and a receiving terminal of side-link communication, thereby avoiding the problems of power consumption waste or SL communication quality degradation caused by asynchronous side-link retransmission scheduling timers.

In a first aspect, a method of side-link communication is provided, the method comprising:

the first terminal device sends first information to the second terminal device, wherein the first information is used for indicating a retransmission time threshold value and/or a starting time threshold value of a retransmission scheduling timer of data of a first side uplink, and the first side uplink is a communication link between the first terminal device and the second terminal device;

the first terminal device transmitting side-uplink control information SCI to the second terminal device over the first side-link, the SCI comprising an identification of the first side-link procedure;

The first terminal device processes a retransmission scheduling timer or a retransmission waiting timer corresponding to the first side link procedure according to the first information.

In this technical solution, a transmitting terminal (i.e., a first terminal) of the sidestream communication aligns, in advance, a retransmission number threshold and/or a starting number threshold of a retransmission scheduling timer of data of a first sidestream link (i.e., a communication link between the first terminal and a second terminal) by transmitting first information to a receiving terminal (i.e., a second terminal). Subsequently, the first terminal and the second terminal may start the retransmission scheduling timer after the retransmission waiting timer of the corresponding side uplink process expires, or start the retransmission waiting timer after the transmission (for the first terminal) or the reception (for the second terminal) of the SCI, when the number of retransmissions of the data of the first side uplink reaches the threshold number of retransmissions and/or the number of starts of the retransmission scheduling timer associated with the SCI reaches the threshold number of starts according to the first information. Thereby, the first terminal and the second terminal are synchronized with or without starting the retransmission scheduling timer.

On the basis of the synchronization realized by starting or not starting the retransmission scheduling timer, adverse effects caused by the fact that the first terminal and the second terminal are not synchronized due to the starting or not starting of the retransmission scheduling timer can be avoided.

For example, it may be avoided that the power consumption caused by the fact that the first terminal does not start the retransmission scheduling timer and the second terminal meaningless starts and runs the retransmission scheduling timer in the scenario that the second terminal starts the retransmission scheduling timer.

For another example, the problem that the communication quality of SL is reduced because the second terminal may not receive the new transmission data sent by the first terminal in a scenario in which the first terminal starts the retransmission scheduling timer and schedules the new transmission data in the running time of the retransmission scheduling timer, and the second terminal does not start the retransmission scheduling timer may also be avoided.

With reference to the first aspect, in some implementations of the first aspect, the processing, by the first terminal device, a retransmission scheduling timer corresponding to the first side uplink process according to the first information includes:

according to the first information, under the condition that the first condition is met, the first terminal device does not start a retransmission scheduling timer corresponding to the first side uplink process after a retransmission waiting timer corresponding to the first side uplink process is overtime; or alternatively, the process may be performed,

The first terminal device starts a retransmission scheduling timer corresponding to the first side link process after a retransmission waiting timer corresponding to the first side link process times out in a case where it is determined that the first condition is not satisfied based on the first information,

wherein the first condition includes at least one of:

the current retransmission times of the SCI scheduled data reach a retransmission times threshold value; or alternatively, the process may be performed,

the current starting times of the retransmission scheduling timers corresponding to the first side uplink processes corresponding to the SCIs reach a starting times threshold.

In the implementation manner, the first terminal does not start the retransmission scheduling timer under the condition that the first condition is met according to the first information, otherwise, starts the retransmission scheduling timer under the condition that the first condition is not met, and can achieve the synchronization of the first terminal and the second terminal on the starting or non-starting of the retransmission scheduling timer.

With reference to the first aspect, in some implementations of the first aspect, the processing, by the first terminal device, a retransmission waiting timer corresponding to the first side uplink process according to the first information includes:

the first terminal device does not start a retransmission waiting timer corresponding to the first side link procedure after sending the SCI according to the first information in the case that the first condition is met; or alternatively, the process may be performed,

The first terminal device starts a retransmission waiting timer corresponding to the first side link process after sending the SCI according to the first information if the first condition is not met;

wherein the first condition includes at least one of:

In this implementation, according to the first information, if the first condition is satisfied, after sending the SCI, the first terminal does not start a retransmission waiting timer corresponding to the first side link procedure; or in the case that the first condition is not satisfied, after the SCI is transmitted, the first terminal starts a retransmission waiting timer corresponding to the first side uplink process. By controlling the start or non-start of the retransmission waiting timer, the synchronization of the start or non-start of the retransmission scheduling timer by the first terminal and the second terminal can be realized.

With reference to the first aspect, in certain implementations of the first aspect, the first information is for a first side-link process, wherein the first terminal device includes a plurality of side-link processes, and the first side-link process is one of the plurality of side-link processes.

With reference to the first aspect, in certain implementations of the first aspect, the method further includes:

the first terminal device sends first information to the access network equipment.

the first terminal device receives first information from the access network equipment.

In a second aspect, a method of side-link communication is provided, the method comprising:

the second terminal device receives first information from the first terminal device, wherein the first information is used for indicating a retransmission time threshold value and/or a starting time threshold value of a retransmission scheduling timer of data of a first side uplink, and the first side uplink is a communication link between the first terminal device and the second terminal device;

the second terminal device receives side-link control information SCI from the first terminal device over the first side-link, the SCI containing an identification of the first side-link procedure;

and the second terminal device processes a retransmission scheduling timer or a retransmission waiting timer corresponding to a second side uplink process according to the first information, wherein the second side uplink process is used for processing SCI scheduled data, and the first side uplink process is associated with the second side uplink process.

With reference to the second aspect, in some implementations of the second aspect, the processing, by the second terminal device, a retransmission scheduling timer corresponding to the second side uplink process according to the first information includes:

according to the first information, under the condition that the first condition is met, the second terminal device does not start a retransmission scheduling timer corresponding to the second side uplink process after a retransmission waiting timer corresponding to the second side uplink process is overtime; or alternatively, the process may be performed,

the second terminal device starts a retransmission scheduling timer corresponding to the second side uplink process after a retransmission waiting timer corresponding to the second side uplink process is overtime under the condition that the first condition is not met according to the first information;

wherein the first condition includes at least one of:

the current start time of the retransmission scheduling timer corresponding to the second side uplink process corresponding to the SCI reaches the start time threshold.

With reference to the second aspect, in some implementations of the second aspect, the processing, by the second terminal device, a retransmission waiting timer corresponding to the second side uplink process according to the first information includes:

The second terminal device does not start a retransmission waiting timer corresponding to the second side uplink process after receiving the SCI according to the first information in the case that the first condition is satisfied; or alternatively, the process may be performed,

the second terminal device starts a retransmission waiting timer corresponding to the second side uplink process after receiving the SCI according to the first information in the case that the first condition is not satisfied;

wherein the first condition includes at least one of:

With reference to the second aspect, in certain implementations of the second aspect, the first information is for a first side uplink process.

The aspects of the second aspect are methods on the receiving terminal side corresponding to the aspects of the first aspect, and with respect to the beneficial technical effects of the aspects of the second aspect, reference may be made to the description of the corresponding aspects of the first aspect, which is not repeated.

In a third aspect, a method of side-link communication is provided, the method comprising:

the first terminal device acquires a first side uplink resource;

The first terminal device determines a destination address corresponding to the second terminal device, the time domain of the first side-link resource overlapping or partially overlapping with the activation time of the destination address,

wherein the activation time does not include a first duration, the first duration being an operation duration of a retransmission scheduling timer of a side uplink process of the destination address that does not support HARQ feedback, or,

the running time of the continuous timer of the destination address, the running time of the non-activated timer, the running time of a retransmission scheduling timer of a side uplink process supporting HARQ feedback or the time of a first terminal device expecting to receive a Channel State Information (CSI) report belongs to the activation time;

the first terminal device performs side-link communication with the second terminal device according to the activation time.

In the technical scheme, the running time of the retransmission scheduling timer corresponding to the side uplink process which does not support HARQ feedback is not considered in the activation time by the first terminal, so that the problem that the first terminal runs the retransmission scheduling timer and the second terminal does not run the retransmission scheduling timer, and new transmission data is sent to the second terminal in the retransmission scheduling timer by the first terminal and cannot be received by the second terminal is avoided, and the quality of SL communication can be improved.

With reference to the third aspect, in some implementations of the third aspect, if a first timer is in an operation state within an operation duration of a retransmission scheduling timer of the side uplink process that does not support HARQ feedback, the activation time includes an operation duration of the first timer, where the first timer includes a persistent timer, an inactivity timer, or a retransmission scheduling timer of a third side uplink process that supports HARQ feedback; or alternatively, the process may be performed,

and in the operation time length of the retransmission scheduling timer of the side link process which does not support HARQ feedback, the first terminal device is in a state of expecting to receive the CSI report, and the activation time comprises the time length of expecting to receive the CSI report by the first terminal device.

With reference to the third aspect, in certain implementations of the third aspect, the method further includes:

the first terminal device acquires a second side uplink resource;

wherein the second side uplink resource is not available in the following case:

the time domain of the second side uplink resource has no overlapping part with any one of the running time length of the continuous timer of any destination address, the running time length of the non-activated timer, the running time length of the retransmission scheduling timer of the side uplink process supporting the HARQ feedback or the time length of the first terminal device expecting to receive the CSI report,

Wherein the second sidelink resource being unavailable comprises the second sidelink resource being unavailable for transmission of the sidelink or the second sidelink resource being unavailable for initial transmission of the sidelink.

In a fourth aspect, a method of side-link communication is provided, the method comprising:

the first terminal device sends side uplink control information SCI to the second terminal device, the SCI containing an identification of the first side uplink process;

the first terminal device judges whether the first side uplink process supports HARQ feedback;

under the condition that the first side link process does not support HARQ feedback, the first terminal device does not start a retransmission waiting timer or a retransmission scheduling timer corresponding to the first side link process;

in the case where the first side link process supports HARQ feedback, the first terminal device starts a retransmission waiting timer or a retransmission scheduling timer corresponding to the first side link process.

In the technical scheme, for the side uplink process which does not support HARQ feedback, the first terminal does not operate the retransmission scheduling timer corresponding to the side uplink process, so that adverse effects caused by asynchronous starting (or operation) of the retransmission scheduling timers of the first terminal and the second terminal can be avoided.

For example, the problem that the second terminal may not receive new transmission data sent by the first terminal due to the fact that the first terminal does not operate the retransmission scheduling timer and the second terminal operates the retransmission scheduling timer can be avoided, and therefore communication quality of the SL is improved.

In addition, the power consumption caused by meaningless operation of the retransmission scheduling timer of the side uplink process which does not support the HARQ feedback by the second terminal can be avoided.

With reference to the fourth aspect, in some implementations of the fourth aspect, in a case where the first side uplink process does not support HARQ feedback, the first terminal device does not start a retransmission waiting timer or a retransmission scheduling timer corresponding to the first side uplink process, including:

under the condition that the first side link process does not support HARQ feedback, the first terminal device does not start a retransmission scheduling timer corresponding to the first side link process under the condition that a retransmission waiting timer corresponding to the first side link process is overtime; or alternatively, the process may be performed,

in the case where the first side link process does not support HARQ feedback, the first terminal apparatus does not start a retransmission wait timer corresponding to the first side link process after transmitting the SCI.

In the implementation manner, under the condition that the first side link process does not support HARQ feedback, after the retransmission waiting timer corresponding to the first side link process is overtime, the first terminal does not start the retransmission scheduling timer corresponding to the first side link process; alternatively, after the SCI is transmitted, a retransmission wait timer corresponding to the first side uplink procedure is not started. In these ways, a synchronization with the second terminal with respect to the non-initiation of the retransmission scheduling timer may be achieved.

With reference to the fourth aspect, in some implementations of the fourth aspect, in a case where the first side uplink process supports HARQ feedback, the first terminal device starts a retransmission waiting timer or a retransmission scheduling timer corresponding to the first side uplink process, including:

under the condition that the first side link process supports HARQ feedback, the first terminal device starts a retransmission scheduling timer corresponding to the first side link process under the condition that a retransmission waiting timer corresponding to the first side link process is exceeded; or alternatively, the process may be performed,

in the case where the first side link process supports HARQ feedback, the first terminal apparatus starts a retransmission waiting timer corresponding to the first side link process after transmitting the SCI.

In the implementation manner, under the condition that the first side link process supports HARQ feedback, after a retransmission waiting timer corresponding to the first side link process is overtime, the first terminal starts a retransmission scheduling timer corresponding to the first side link process; or after the SCI is sent, starting a retransmission waiting timer corresponding to the first side uplink process. In these ways, synchronization with the second terminal for the start of the retransmission scheduling timer can be achieved.

In a fifth aspect, a method of side-link communication is provided, the method comprising:

the second terminal device receives side-link control information SCI from the first terminal device, the SCI containing an identification of the first side-link procedure;

the second terminal device judges whether a second side uplink process supports hybrid automatic repeat request (HARQ) feedback, wherein the second side uplink process is used for processing data scheduled by the SCI and is associated with the first side uplink process;

under the condition that the first side link process does not support HARQ feedback, the second terminal device does not start a retransmission waiting timer or a retransmission scheduling timer corresponding to the first side link process; or alternatively, the process may be performed,

in case the first side-link process supports HARQ feedback, the second terminal device starts a retransmission waiting timer or a retransmission scheduling timer corresponding to the first side-link process.

With reference to the fifth aspect, in some implementations of the fifth aspect, in a case where the first side link process does not support HARQ feedback, the second terminal device does not start a retransmission waiting timer or a retransmission scheduling timer corresponding to the first side link process, including:

under the condition that the first side link process does not support HARQ feedback, the second terminal device does not start a retransmission scheduling timer corresponding to the first side link process under the condition that a retransmission waiting timer corresponding to the first side link process is overtime and SCI scheduled data is not successfully decoded; or alternatively, the process may be performed,

In the case where the first side link process does not support HARQ feedback, the second terminal apparatus does not start a retransmission waiting timer corresponding to the first side link process after receiving the SCI.

With reference to the fifth aspect, in some implementations of the fifth aspect, in a case where the first side uplink process supports HARQ feedback, the second terminal device starts a retransmission waiting timer or a retransmission scheduling timer corresponding to the first side uplink process, including:

when the first side link process supports HARQ feedback, the second terminal device starts a retransmission scheduling timer corresponding to the first side link process when a retransmission waiting timer corresponding to the first side link process is overtime and SCI scheduled data is not successfully decoded; or alternatively, the process may be performed,

in the case where the first side link process supports HARQ feedback, the second terminal apparatus starts a retransmission waiting timer corresponding to the first side link process after receiving the SCI.

The aspects of the fifth aspect are the method on the receiving terminal side corresponding to the aspects of the fourth aspect, and with respect to the advantageous technical effects of the aspects of the fifth aspect, reference may be made to the description of the corresponding aspects of the fourth aspect, which is not repeated.

A sixth aspect provides a communications device having functionality to implement the method of the first, third or fourth aspects, or any possible implementation of any of these aspects. The functions may be implemented by hardware, or may be implemented by hardware executing corresponding software. The hardware or software includes one or more units corresponding to the above functions.

A seventh aspect provides a communications device having functionality to implement the second or fifth aspect, or the method in any possible implementation of any of these aspects. The functions may be implemented by hardware, or may be implemented by hardware executing corresponding software. The hardware or software includes one or more units corresponding to the above functions.

In an eighth aspect, a communications apparatus is provided that includes a processor and a memory. Optionally, a transceiver may also be included. Wherein the memory is for storing a computer program, the processor is for invoking and running the computer program stored in the memory and controlling the transceiver to transceive signals to cause the communication device to perform the method as in the first, third or fourth aspect, or any possible implementation of any of these aspects.

The communication device is illustratively a transmitting terminal for side-link communication.

In a ninth aspect, a communications apparatus is provided that includes a processor and a memory. Optionally, a transceiver may also be included. Wherein the memory is for storing a computer program, the processor is for invoking and running the computer program stored in the memory and controlling the transceiver to transceive signals to cause the communication device to perform the method as in the second or fifth aspect, or any possible implementation of any of these aspects.

The communication device is illustratively a receiving terminal for side-link communication.

In a tenth aspect, there is provided a communication device comprising a processor and a communication interface for receiving data and/or information and transmitting the received data and/or information to the processor, the processor processing the data and/or information, and the communication interface further being for outputting the data and/or information after processing by the processor such that the method as in the first aspect, the third aspect or the fourth aspect, or any of the possible implementations of any of these aspects, is performed.

In an eleventh aspect, there is provided a communication device comprising a processor and a communication interface for receiving data and/or information and transmitting the received data and/or information to the processor, the processor processing the data and/or information, and the communication interface further being for outputting the data and/or information after processing by the processor, such that the method as in the second or fifth aspect, or any of the possible implementations of any of the aspects, is performed.

A twelfth aspect provides a computer readable storage medium having stored therein computer instructions which, when run on a computer, cause the method as in the first aspect, the third aspect or the fourth aspect, or any possible implementation of any of these aspects, to be performed.

A thirteenth aspect provides a computer readable storage medium having stored therein computer instructions which, when run on a computer, cause the method as in the second or fifth aspect, or any possible implementation of any of these aspects, to be performed.

A fourteenth aspect provides a computer program product comprising computer program code which, when run on a computer, causes the method as in the first aspect, the third aspect or the fourth aspect, or any of the possible implementations of any of these aspects, to be performed.

A fifteenth aspect provides a computer program product comprising computer program code which, when run on a computer, causes the method as in the second or fifth aspect, or any of the possible implementations of any of these aspects, to be performed.

In a sixteenth aspect, there is provided a wireless communication system comprising a communication device as described in the sixth aspect, and/or a communication device as described in the seventh aspect.

Drawings

Fig. 1 is a schematic diagram of a communication scenario suitable for the technical scheme of the application.

Fig. 2 is a schematic diagram of the transmission of SL HARQ feedback enabled.

Fig. 3 is a schematic diagram of the transmission of SL HARQ feedback disabled.

Fig. 4 is one possible occurrence of the transmission of SL HARQ feedback disabled.

Fig. 5 is another possible scenario for the transmission of SL HARQ feedback disabled.

Fig. 6 is a schematic flow chart diagram of a method of side-link communication provided herein.

Fig. 7 is a schematic diagram of another method of side-link communication provided herein.

Fig. 8 is a schematic diagram of a SL LCP process.

Fig. 9 (a) shows an example of the activation time corresponding to the destination address.

Fig. 9 (b) shows another example of the activation time corresponding to the destination address.

Fig. 10 is a schematic flow chart diagram of another method of side-link communication provided herein.

Fig. 11 (a) is a schematic flow of a timer corresponding to a transmission terminal processing side uplink procedure.

Fig. 11 (b) is another schematic flow of a timer corresponding to the transmission terminal processing side uplink procedure.

Fig. 12 (a) is a schematic flow of a timer corresponding to a reception terminal processing side uplink procedure.

Fig. 12 (b) is another schematic flow of the timer corresponding to the reception terminal processing side uplink procedure.

Fig. 13 is a schematic block diagram of a communication device provided herein.

Fig. 14 is a schematic structural diagram of a communication device provided in the present application.

Detailed Description

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

The technical solution of the present application may be applied to various wireless communication systems, including but not limited to a long term evolution (long term evolution, LTE) system, a New Radio (NR) system, a next generation wireless lan system, and the like.

To support direct communication between terminals, sidelink (SL) communication is introduced. In SL communication, the transmission of the SL is addressed by the source and destination identities of the medium access control (medium access control, MAC) layer. In the related art, a plurality of logical channels may be established between terminals performing SL communication for data transmission. After the terminal acquires the SL grant (SL grant), the logical channel is selected to transmit data by a logical channel priority (logical channel prioritization, LCP) selection method.

In side-link communication, terminal configuration may be configured for discontinuous reception (discontinuous reception, DRX), hereinafter referred to as SL DRX, in order to save power consumption of the terminal. The SL DRX refers to that the UE listens to the SCI (including the first stage SCI and the second stage SCI) in a specified activation time (active time), and does not need to listen to the SCI in an inactive time, so that the receiver is turned off to achieve the effect of saving power consumption.

Several timers and their respective functions associated with SL DRX are described below.

Side-link discontinuous reception duration timer (sidelink drx on-duration timer): for defining the duration of the SL DRX duration at the start of a cycle. It should be noted that the duration timer is periodically running, and the duration timer is started at the beginning of each SL DRX cycle. The UE needs to monitor SCI during the activation time. .

Side-uplink discontinuous reception inactivity timer (sidelink drx inactivity timer): the UE starts an activity timer whenever it is scheduled to transmit new data. The inactivity timer specifies the duration of time that the UE is continuously active after receiving a SCI indicating a new transmission. That is, the activity timer is restarted once every time a UE has new transmission data scheduled.

In addition, unicast, multicast and broadcast are supported on the side-links. Wherein unicast and multicast communication side-link discontinuous reception retransmission waiting timer (SL drx HARQ RTT timer) and side-link discontinuous reception retransmission scheduling timer (sidelink retransmission timer) are used for retransmission control.

Side-uplink discontinuous reception retransmission scheduling timer: for defining a maximum duration of time until the UE receives a data retransmission. Wherein, in the time length of running the retransmission scheduling timer, the UE is in the activation time.

Side-uplink discontinuous reception retransmission waiting timer: the minimum duration before the UE expects to receive the retransmission schedule is defined as the duration that the UE waits from receiving data to receiving the data retransmission of the data.

In the current communication standard, both the transmitting terminal and the receiving terminal maintain SL HARQ RTT timers and SL retransmission timer based on the side-link procedure (i.e., per sidelink process). Each SL process would be configured with one SL HARQ RTT timer and one SL retransmission timer.

Regarding the functions of SL HARQ RTT timer and SL retransmission timer, the following will be described in connection with whether or not the transmission of the side link supports HARQ feedback, respectively.

It will be appreciated that, since the present application relates to side-link communication, the prefix related to "side-link discontinuous reception" in the names of the above timers is omitted herein, for example, the side-link discontinuous reception continuous timer is abbreviated as a continuous timer, the side-link discontinuous reception non-active timer is abbreviated as an active timer, the side-link discontinuous reception retransmission waiting timer is abbreviated as a HARQ RTT timer or a retransmission waiting timer, and the side-link discontinuous reception retransmission scheduling timer is abbreviated as a retransmission timer or retransmission scheduling timer, which will not be repeated hereinafter.

Referring to fig. 1, fig. 1 is a schematic diagram of a communication scenario suitable for the technical scheme of the present application. As shown in fig. 1, the technical solution of the present application is applicable to a scenario in which a UE performs side link (sidelink) communication based on SL DRX. A transmitting terminal for side-link communication may operate in mode 1 (i.e., mode 1) or mode 2 (i.e., mode 2), and may be in a radio resource control (radio resource control, RRC) connected state, an RRC inactive state, an RRC idle state, or an out of coverage (OOC) state. The communication between the transmitting terminal and the receiving terminal may be a unicast communication or a multicast communication.

In the above communication scenario, the access network device provides the SL resource pool configuration for the transmitting terminal. If the transmitting terminal is operating in mode1, the access network device may schedule SL resources for the transmitting terminal through downlink control information (downlink control information, DCI) or provide SL configuration grants (SL configured grant) for the transmitting terminal through radio resource control (radio resource control, RRC) configuration.

The transmitting terminal may operate in mode1 or mode2, and after acquiring the SL grant, the transmitting terminal transmits data to the receiving terminal using the SL resource.

The present application relates generally to terminals and access network devices.

A terminal, also called User Equipment (UE), mobile Station (MS), mobile Terminal (MT), terminal equipment, etc., is a device that provides voice and/or data connectivity to a user. In this application, the terminal refers to, in particular, a device capable of performing sidelink communication, for example, a vehicle-mounted terminal, or a handheld terminal capable of performing V2X communication, or the like.

Alternatively, in this application, the transmitting end of the side-link communication is also referred to as a transmitting terminal, a transmitting UE (i.e., TX UE), a transmitting end UE, UE1, or a first terminal, and the receiving end is referred to as a receiving terminal, a receiving UE (i.e., RX UE), a receiving end UE, UE2, or a second terminal.

An access network device refers to a node (or device), also called a base station, of a radio access network (radio access network, RAN) that accesses a terminal to a wireless network.

Unicast and multicast communication of the sidelink support hybrid automatic repeat request (hybrid automatic repeat request, HARQ) feedback and introduce a physical sidelink feedback channel (physical sidelink feedback channel, PSFCH) to transmit HARQ feedback, i.e., HARQ feedback is sent on PSFCH resources. For one transmission, the SL HARQ feedback also supports enabled and disabled, i.e., if the current transmission supports SL HARQ feedback, the SL HARQ feedback is enabled; and if the transmission does not support SL HARQ feedback, the transmission is SL HARQ feedback disabled.

As described above, both unicast and multicast communications for the side links support SL HARQ RTT timer and SL retransmission timer. SL HARQ RTT timer and SL retransmission timer are per SL process maintenance on the TX UE side and RX UE side.

Referring to fig. 2, fig. 2 is a schematic diagram of the transmission of SL HARQ feedback enabled. As with fig. 2, for the transmission of SL HARQ feedback enabled, the RX UE starts SL HARQ RTT timer at symbol/slot (e.g., at the first symbol/slot) after the PSFCH transmission ends. If the PSFCH transmission is low priority without sending the PSFCH because of the priority problem, the RX UE will still start SL HARQ RTT timer at symbol/slot (e.g. at first symbol/slot) after the PSFCH resource has ended. When SL HARQ RTT timer times out, if the data of the corresponding SL process is not decoded successfully, e.g., PSFCH is fed back as a negative acknowledgement (negative acknowledgement, NACK), the RX UE starts the corresponding SL retransmission timer at symbol/slot (e.g., first symbol/slot) after SL HARQ RTT timer times out.

The TX UE starts the HARQ RTT timer at symbol/slot (e.g., at the first symbol/slot) after receiving the PSFCH or PSFCH resource. When the HARQ RTT timer times out, and the HARQ feedback is NACK or no HARQ feedback is received, the TX UE starts the corresponding SL retransmission timer at the corresponding symbol/slot (e.g., at the first symbol/slot).

The transmission of SL HARQ feedback disabled is described below in connection with fig. 3.

Referring to fig. 3, fig. 3 is a schematic diagram of the transmission of SL HARQ feedback disabled. Considering that SL HARQ feedback disabled is not capable of PSFCH transmission, one possible scenario is: the RX UE starts the HARQ RTT timer at symbol/slot after receiving the SCI (e.g., first symbol/slot). At the time of the HARQ RTT timer timeout, if the data corresponding to the SL process is not decoded successfully, the RX UE starts the corresponding SL retransmission timer at symbol/slot (e.g., the first symbol/slot) after SL HARQ RTT timer timeout.

Whereas for TX UEs, HARQ RTT timer is started at symbol/slot after SCI is sent (e.g., first symbol/slot). At the time of the HARQ RTT timer timeout, the TX UE is based on implementation determination whether to activate the corresponding SL retransmission timer, because the TX UE cannot know whether the RX UE successfully decoded SCI scheduled data. For example, the TX UE considers that it is necessary to continue retransmitting the data to the RX UE, which may then start retransmission timer. If the TX UE deems it not necessary to continue retransmitting the data to the RX UE, then retransmission timer is not started later.

As can be seen from the transmission case of SL HARQ feedback disabled introduced in fig. 3, for the transmission of SL HARQ feedback disabled, the problem of out-of-sync start of retransmission timer on the TX UE side and on the RX UE side may occur and may thereby cause some adverse effects, as will be described in detail below in connection with fig. 4 and 5.

Referring to fig. 4, fig. 4 is one possible occurrence of the transmission of SL HARQ feedback disabled. As in fig. 4, for SL DRX, if the RX UE does not successfully decode SCI scheduled data, after SL HARQ RTT timer times out, the RX UE will start SL retransmission timer in anticipation of receiving a retransmission of the data by the TX UE. However, if the TX UE considers that it is not necessary to continue to retransmit the SCI scheduled data based on the implementation (e.g., the TX UE considers that the RX UE has successfully decoded the data), then the TX UE does not start SL retransmission timer after SL HARQ RTT timer times out. A situation arises in which the TX UE is not operating SL retransmission timer and the RX UE is operating SL retransmission timer. This situation increases the power consumption of the RX UE, affecting the power saving effect of the RX UE.

Referring to fig. 5, fig. 5 is another possible occurrence of the transmission of SL HARQ feedback disabled. As in fig. 5, the RX UE successfully decodes the SCI scheduled data and does not activate SL retransmission timer after SL HARQ RTT timer times out. While the TX UE may start SL retransmission timer after SL HARQ RTT timer timeout based on implementing the data that is deemed to require the SCI schedule to continue to be retransmitted (e.g., deemed that the RX UE did not successfully decode the data). In this case, if the TX UE schedules new transmission data (e.g., new transmission data of other SL processes) during the time the TX UE is running SL retransmission timer, the RX UE may not receive the new transmission data (e.g., when retransmission timer is running, the RX UE has no other timers belonging to the active time running), and thus the RX UE may not receive the new transmission data and cannot start the activity timer or retransmission timer of the new transmission data, and result in receiving no retransmission corresponding to the new transmission data. It can be seen that this situation will greatly affect the quality of the side-link communication.

The present application provides solutions to some of the adverse effects that occur in the above-described SL HARQ feedback disabled transmissions due to the asynchronous activation or deactivation of SL retransmission timer by the TX UE and the RX UE.

The technical scheme provided by the application is described below.

Herein, the first terminal apparatus and the second terminal apparatus may be terminal devices, or chips mounted in the terminal devices, or devices, parts, or combinations thereof, etc. in the terminal devices, which can realize the respective functions. In the following embodiments, a first terminal apparatus and a second terminal apparatus are described as examples of terminal devices.

The present application provides 3 different schemes to achieve synchronization of the start or non-start of retransmission scheduling timers of TX UE and RX UE. It will be appreciated that the above-described problems due to the non-synchronization of the start or non-start of the retransmission scheduling timer will also be avoided on the basis of the synchronization of the start or non-start of the retransmission scheduling timer.

Scheme 1

The TX UE and the RX UE are pre-aligned with a threshold of the number of retransmissions of the first side-link or a threshold of the number of starts of the retransmission scheduling timer, wherein the first side-link refers to the communication link between the TX UE and the RX UE.

Alternatively, the number of retransmissions of the first side link may also be the number of transmissions of the first side link, where the transmissions of the first side link include initial transmissions and retransmissions.

Referring to fig. 6, fig. 6 is a schematic flow chart diagram of a method of side-link communication provided herein.

210. The first terminal sends the first information to the second terminal, and the second terminal receives the first information from the first terminal.

The first information is used for indicating a retransmission time threshold value of data of the first side link and/or a starting time threshold value of a retransmission scheduling timer. The first side uplink is a communication link between the first terminal and the second terminal.

It is known that a first terminal needs to determine a destination address before sending a first message.

Alternatively, the destination address may correspond to a unicast connection or a multicast group.

In unicast communication, a TX UE transmits a source address (or source identifier) and a destination address (or destination identifier) along with data when transmitting the data. Wherein the source address is the address allocated by the TX UE itself and the destination address is the address allocated by the RX UE for the unicast connection.

If unicast communication is performed, in step 210, the destination address of the TX UE for transmitting the first information corresponds to one RX UE. Accordingly, the first information indicates a retransmission number threshold and/or a starting number threshold of a retransmission scheduling timer for data of a side-link between the TX UE and the RX UE.

In multicast communication, creation of a multicast group corresponding to multicast communication is performed at an upper layer (specifically, a layer above an access layer, for example, a PC5-S layer or a V2X layer). In multicast communication, when TX UE transmits data, a source address and a destination address are transmitted along with the data, where the source address is allocated by TX UE itself, and the destination address is an address obtained by converting a multicast group identifier.

If multicast communication is performed, in step 210, the destination address of the TX UE for transmitting the first information corresponds to one multicast group, or a plurality of second terminals. Thus, the first information may correspond to a side-link between the first terminal and any one of the plurality of second terminals. The threshold of the retransmission times indicated by the first information is a threshold of the retransmission times of the data of the side link between the TX UE and one RX UE in the multicast group, or the threshold of the starting times is a threshold of the starting times of a retransmission scheduling timer of a side link process associated with SCI corresponding to the data of the TX UE performing the side link communication with the RX UE in the multicast group.

For example, the first information may be a value, which may be the number of HARQ retransmissions (selected number of HARQ retransmission) or the number of HARQ retransmissions-1 or the number of HARQ retransmissions +1 determined by the resource selection or the resource reselection when the first terminal is in mode 2.

Illustratively, the first information is carried in a SL MAC CE identified by a dedicated SL logical channel identification (logical channel identifier, LCID).

Alternatively, the granularity of the first information may be based on the side-link process (i.e., per SL process), or the first information corresponding to different side-link processes may be different. For example, the first terminal includes a plurality of side-link processes, and the first information may be different for each side-link process.

Optionally, step 220 is included.

220. The access network device sends the first information to the first terminal, or the first terminal sends the first information to the access network device.

Illustratively, the first information interacted between the access network device and the first terminal is carried on RRC dedicated signaling.

Illustratively, the first information is carried in a MAC CE identified by a dedicated LCID.

Alternatively, the granularity of the first information may be based on the UE (i.e., per UE), the destination address (i.e., per destination), or the HARQ process of the Uu interface (i.e., uu HARQ process). Likewise, the destination address may correspond to a unicast connection or a multicast group.

It should be noted that if the granularity of the first information is based on Uu HARQ process (which may also be directly referred to as HARQ process), the TX UE needs to allocate a SL process, and the Uu HARQ process establishes a mapping relationship, where the SL process allocated by the TX UE is used for processing data of the first side uplink. In other words, if the first information received by the TX UE from the access network device is Uu HARQ process granularity, the TX UE may convert to per SL process granularity.

As an example of an implementation, step 220 is performed when the TX UE is in an RRC connected state.

As an example of another implementation, step 220 is performed when the TX UE is configured to be in mode 1.

230. The first terminal transmits the SCI to the second terminal, which receives the SCI from the first terminal.

Wherein the SCI contains an identification (e.g., sidelink process identifier, SL process ID) of a first side-link process of the first terminal, wherein the first side-link process is a side-link process assigned by the first terminal for processing data of the first side-link between the first terminal and the second terminal.

240. And the first terminal processes a retransmission scheduling timer or a retransmission waiting timer corresponding to the first side link process according to the first information. And the second terminal processes a retransmission scheduling timer or a retransmission waiting timer corresponding to the second side uplink process according to the first information.

Wherein the second sidelink process is a sidelink process assigned by the second terminal for handling SCI (specifically SCI received in step 230) scheduled data.

It is to be understood that the first side-link process is a side-link process of the first terminal side, being one of one or more side-link processes of the first terminal side. The second side-link process is a side-link process of the second terminal side, and is one of one or more side-link processes of the second terminal side. The first side-link process is associated with the second side-link process. Alternatively, "associated" may be replaced by "corresponding" or "having a mapping relationship".

The process of the first terminal and the second terminal processing the timer in step 230 will be described in detail.

(1) The TX UE processes a timer corresponding to the first side uplink procedure.

In one implementation, the TX UE may process a retransmission scheduling timer corresponding to the first side uplink procedure, as follows:

according to the first information, under the condition that the first condition is met, the TX UE does not start a retransmission scheduling timer corresponding to the first side uplink process after a retransmission waiting timer corresponding to the first side uplink process is overtime; or alternatively, the process may be performed,

according to the first information, the TX UE starts a retransmission scheduling timer corresponding to the first side link process after the retransmission waiting timer corresponding to the first side link process is overtime under the condition that the first condition is not met,

wherein the first condition includes at least one of:

It should be understood that for the TX UE, the SCI mentioned in the first condition refers to the SCI transmitted by the TX UE in step 230.

In another implementation, the TX UE may process a retransmission wait timer corresponding to the first side uplink procedure, as follows:

according to the first information, under the condition that the first condition is met, the TX UE does not start a retransmission waiting timer corresponding to the first side link process after sending the SCI; or alternatively, the process may be performed,

according to the first information, the TX UE starts a retransmission waiting timer corresponding to the first side link after sending the SCI under the condition that the first condition is not met;

wherein the first condition includes at least one of:

Illustratively, the TX UE starts or does not start a retransmission wait timer corresponding to the first side uplink procedure at a symbol (symbol) or slot (slot) after transmitting the SCI. For example, the symbol may be the first symbol after the SCI is transmitted, or the slot may be the first slot after the SCI is transmitted.

For the RX UE, the SCI mentioned in the first condition refers to the SCI received by the RX UE in step 230.

(2) The RX UE processes the timer corresponding to the second side uplink process.

In one implementation, the RX UE may process a retransmission scheduling timer corresponding to the second side uplink procedure, as follows:

according to the first information, under the condition that the first condition is met, the RX UE does not start a retransmission scheduling timer corresponding to the second side uplink process after a retransmission waiting timer corresponding to the second side uplink process is overtime; or alternatively, the process may be performed,

according to the first information, the RX UE starts a retransmission scheduling timer corresponding to the second side uplink process after the retransmission waiting timer corresponding to the second side uplink process is overtime under the condition that the first condition is not met,

wherein the first condition includes at least one of:

the current start time of the retransmission scheduling timer of the second side uplink process corresponding to the SCI reaches the start time threshold.

In another implementation, the RX UE may process a retransmission wait timer corresponding to the second side uplink procedure, as follows:

according to the first information, the RX UE does not start a retransmission waiting timer corresponding to the second side uplink process after receiving the SCI under the condition that the first condition is met; or alternatively, the process may be performed,

The RX UE starts a retransmission waiting timer corresponding to the second side uplink procedure after receiving the SCI in case it is determined that the first condition is not satisfied based on the first information,

wherein the first condition includes at least one of:

It will be appreciated that the RX UE receives the SCI, which contains an identification of the first side-link process, and the RX UE allocates a second side-link process for processing the SCI-scheduled data, i.e. the second side-link process is associated with the first side-link process. Thus, for the RX UE, the SCI corresponds to the second side uplink procedure.

Illustratively, the RX UE starts or does not start a retransmission waiting timer corresponding to the second side uplink procedure at a symbol (symbol) or slot (slot) after receiving the SCI. For example, the symbol may be the first symbol after receiving the SCI, or the slot may be the first slot after receiving the SCI.

Optionally, according to the first information, when determining that the number of retransmissions of the data scheduled by the SCI reaches the threshold number of retransmissions indicated by the first information, and/or the current number of starts of the retransmission scheduling timer corresponding to the side uplink process corresponding to the SCI reaches the threshold number of starts, that is, the TX UE or the RX UE determines, according to the first information, that the current transmission of the data scheduled by the SCI is the last transmission (or the last retransmission), the TX UE or the RX UE empties the HARQ buffer of the corresponding side uplink process. Specifically, the TX UE empties the HARQ buffer of the first side uplink process and the RX UE empties the HARQ buffer of the second side uplink process.

Further, optionally, if the access network device (e.g., the gNB) continues to schedule retransmissions of the first side-link procedure of the TX UE, the TX UE may ignore the side-link grant (SL grant) if the first condition is met.

It can be seen that, in scheme 1, the TX UE and the RX UE do not start the retransmission scheduling timer after the retransmission waiting timer of the corresponding side uplink process of the TX UE and the RX UE times out, or do not start the retransmission waiting timer after the transmission or reception of the SCI when the number of retransmissions of the data scheduled by the SCI reaches the first side link retransmission number threshold between the TX UE and the RX UE, or the current number of starts of the retransmission scheduling timer of the corresponding side uplink process of the SCI reaches the retransmission scheduling number threshold of the retransmission scheduling timer, by pre-aligning the retransmission number threshold of the data of the SL and/or the starting number threshold of the retransmission scheduling timer. And when the retransmission times of the data scheduled by the SCI do not reach the retransmission times threshold of the data of the first side link, or when the current starting times of the retransmission scheduling timers of the side link processes corresponding to the SCI do not reach the starting times threshold, the TX UE and the RX UE start the retransmission scheduling timers after the retransmission waiting timers of the corresponding side link processes are overtime, or start the retransmission waiting timers after the SCI is sent or received. It may be found that the TX UE and the RX UE can achieve synchronization with or without starting the retransmission scheduling timer.

On the basis of starting or not starting the retransmission scheduling timer to realize synchronization, some problems caused by the asynchronous starting or not starting of the retransmission scheduling timer of the TX UE and the RXUE can be avoided.

For example, with scheme 1, it is possible to avoid power consumption caused by the fact that the RX UE meaningless starts and runs the retransmission scheduling timer in a scenario in which the TX UE does not start the retransmission scheduling timer and the RX UE starts the retransmission scheduling timer.

In addition, by adopting the scheme 1, the problems that the TX UE starts the retransmission scheduling timer and schedules new transmission data in the running time of the retransmission scheduling timer, and the RX UE cannot receive the new transmission data sent by the TX UE and affects the communication quality of SL under the scene that the RX UE does not start the retransmission scheduling timer can be avoided.

Scheme 2

The TX UE does not use the running duration of the retransmission scheduling timer corresponding to the side uplink process that does not support HARQ feedback as the activation time of the destination address. Or, the activation time corresponding to the destination address determined by the TX UE does not include the running duration of the retransmission scheduling timer corresponding to the side uplink process that does not support HARQ feedback.

Referring to fig. 7, fig. 7 is a schematic diagram of another method of side-link communication provided herein.

310. The TX UE acquires a first side uplink resource.

320. The TX UE determines a destination address, where the destination address corresponds to the RX UE, and the time domain of the first side link resource overlaps or partially overlaps with the activation time of the destination address.

The method comprises the steps that the activation time does not comprise a first time length, wherein the first time length is the running time length of a retransmission scheduling timer of a side uplink process which does not support HARQ feedback of a destination address; or alternatively, the process may be performed,

the first time period does not belong to an activation time; or alternatively, the process may be performed,

the running time of a continuous timer of a destination address, the running time of an inactive timer, the running time of a retransmission scheduling timer corresponding to a side uplink process supporting HARQ feedback, or the time of a TX UE expecting to receive a CSI report belongs to the activation time; or alternatively, the process may be performed,

the activation time does not include the running time of the continuous timer, the running time of the non-activated timer, the running time of the retransmission scheduling timer corresponding to the side uplink process supporting the HARQ feedback, or the time of the TX UE expecting to receive the CSI report belongs to the activation time.

Alternatively, the duration of time that the TX UE expects to receive the CSI report may also be implemented by a timer, for example, a second timer is configured, and when the TX UE expects to receive the CSI report, the second timer is started, and during the duration of the second timer, the TX UE is in a state of waiting to receive the CSI report.

330. The TX UE performs side-link communication with the RX UE according to the activation time.

Alternatively, scheme 2 is applicable when the TX UE is operating in either mode1 or mode 2.

In mode1, the TX UE acquires a SL grant from the access network device and then determines the destination address and LCH(s) of the transmission for the SL grant through a SL logical channel priority (logical channel prioritization, LCP) procedure.

In mode2, the TX UE first obtains a SL grant through resource selection (or resource reselection) and then determines the destination address and LCH(s) of the transmission through a SL LCP procedure for that SL grant.

It can be seen that in either mode1 or mode2, the TX UE is involved in the SL LCP procedure. When the TX UE determines the destination address through the SL LCP procedure, the operation duration of the retransmission scheduling timer corresponding to the side uplink process that does not support HARQ feedback is disregarded in the activation time corresponding to the destination address.

It should be appreciated that the TX UE needs to perform the SL LCP procedure at the time of data new transmission, as described below in connection with fig. 8.

Referring to fig. 8, fig. 8 is a schematic diagram of a SL LCP process.

As shown in fig. 8, the sl LCP procedure includes two steps of TX UE selection of destination address (destination) and selection of logical channel LCH(s), step1 and step2 as follows, respectively:

step1 TX UE selects the destination address.

The TX UE selects a destination address corresponding to an LCH(s) or MAC CE having the highest priority while satisfying the second condition among LCHs(s) or MAC CEs associated with unicast, multicast, or broadcast.

Illustratively, the second condition may include one or more of:

effective SL data transmission, SB _j Greater than 0, allow the use of SL-CG type1 (if SL grant is configured grant type 1), etc.

step2 TX UE selects LCH(s).

The TX UE selects LCH(s) that satisfies the third condition while being associated with the selected destination address in step 1.

Illustratively, the third condition may include one or more of:

valid SL transmission data, allowed use of SL-CG type1 (if SL grant is configured grant type), HARQ feedback enable/disable attribute identity corresponding to LCH selected in step1, etc.

As can be seen from the SL LCP procedure above, LCH will first be configured as HARQ feedback enabled or disabled. When the PSFCH is not configured by the SL grant (i.e., the SL HARQ feedback cannot be supported), the TX UE can only select LCHs of HARQ feedback disabled when selecting LCHs; when the SL grant configures the PSFCH, the TX UE first selects the destinationto determine the LCH with the highest priority, and then selects the LCHs again, only LCHs with the HARQ feedback enabled/disable attribute identical to the HARQ feedback enabled/disable attribute of the LCH with the highest priority determined in the selected destinationcan be selected. That is, if the LCH with highest priority determined by destination is HARQ feedback enabled, then only HARQ feedback enabled LCHs can be selected subsequently; if the LCH with highest priority determined by destination is HARQ feedback disabled, then only HARQ feedback disabled LCHs can be selected subsequently. Thus, with the SL LCP procedure, it is ultimately determined whether the Transport Block (TB) transmitted is HARQ feedback enabled or HARQ feedback disabled.

Considering the state (i.e., running or not running) of the retransmission scheduling timers of the TX UE and the RX UE, if not synchronized (e.g., the TX UE runs the retransmission scheduling timer and the RX UE does not run), if the TX UE schedules new transmission data within the retransmission scheduling timer, the RX UE may not receive the new transmission data, which will greatly reduce the communication quality of SL.

Before transmitting data, the TX UE acquires a first side-link resource (i.e., SL grant). Alternatively, the TX UE may acquire the first side-link resources based on the scheduling of the access network device, or the TX UE acquires the first side-link resources in mode2 through sensing (transmission) and/or resource selection. Further, the TX UE selects a destination address. When the TX UE selects the destination address through the SL LCP procedure, the time domain of the first side link resource needs to overlap or have partial overlap with the activation time of the destination address. In addition, the activation time does not include the operation time of SL retransmission timer of the SL process of HARQ feedback disabled of the destination address, that is, the operation time of the retransmission scheduling timer corresponding to the side uplink process of the destination address that does not support HARQ feedback, or the operation time of the retransmission scheduling timer of the SL process of the destination address that does not support HARQ feedback does not belong to the activation time.

Alternatively, it can also be said that the activation time of the destination address includes an operation time of a duration timer (i.e., SL on-duration timer) of the destination address, an operation time of an inactivity timer (i.e., SL inactivity timer), an operation time of a retransmission scheduling timer (i.e., SL retransmission timer of SL process of HARQ feedback enabled) corresponding to a side uplink process supporting HARQ feedback, or a time period in which the RX UE expects to receive the channel state information (channel state information, CSI) report.

It should be noted that, the activation time does not include the running duration of the retransmission scheduling timer corresponding to the side uplink process (e.g., the first side uplink process) that does not support HARQ feedback of the destination address, but, within the running duration of the retransmission scheduling timer corresponding to the first side uplink process that does not support HARQ feedback, if the first timer is in the running state, the activation time corresponding to the destination address includes the running duration of the first timer.

Optionally, the first timer includes a persistent timer, an inactivity timer, or a retransmission scheduling timer corresponding to a third side uplink process supporting HARQ feedback.

Referring to fig. 9 (a) and (b), fig. 9 (a) and (b) are schematic explanatory diagrams of activation times corresponding to destination addresses.

As in fig. 9 (a), fig. 9 (a) is an example of the activation time corresponding to the destination address.

The TX UE determines a destination address, wherein the destination address corresponds to a side uplink process 1 which does not support HARQ feedback, and if the operation time length T1 of the retransmission scheduling timer corresponding to the side uplink process 1 is overlapped with the operation time length of the first timer, the operation time length T1 of the retransmission scheduling timer corresponding to the side uplink process 1 still belongs to the activation time.

As in (b) of fig. 9, fig. 9 (b) is another example of the activation time corresponding to the destination address.

The TX UE determines a destination address, the destination address corresponds to a side uplink process 1 which does not support HARQ feedback, and if the operation duration T1 of the retransmission scheduling timer corresponding to the side uplink process 1 is partially overlapped with the operation duration T2 of the first timer, the overlapped duration is T3. According to the scheme 2 provided by the application, the operation duration T1 of the retransmission scheduling timer corresponding to the side uplink process 1 which does not support HARQ feedback does not belong to the activation time, but because the first timer is in the operation state in the part duration T3 of T1, T3 belongs to the activation time, and the (T1-T3) corresponding duration part in the operation duration T1 of the retransmission scheduling timer corresponding to the side uplink process 1 does not belong to the activation time.

Further, in the operation duration of the retransmission scheduling timer of the side-link process that does not support HARQ feedback, if the TX UE is in a state where it is expected to receive the CSI report, the activation time includes a duration in which the TX UE is expected to receive the CSI report.

Optionally, the TX UE acquires the second side uplink resource, and if the time domain of the second side uplink resource has no overlapping portion with any one of the running duration of the persistent timer of any destination address, the running duration of the inactive timer, the running duration of the retransmission scheduling timer corresponding to the side uplink process supporting HARQ feedback, or the duration in which the TX UE expects to receive the CSI report, the second side uplink resource is not available.

Illustratively, the second side-link resources are not available, then the second side-link resources need to be ignored (ignored), or the second side-link resources can only be used for SL retransmissions. In other words, the second side-link resource is not available, meaning that the second side-link resource cannot be used for SL transmission or for SL new transmission.

Optionally, the TX UE acquires the third side uplink resource, and if any one of the time domain of the third side uplink resource and the running time length of the persistent timer of any destination address, the running time length of the inactive timer, the running time length of the retransmission scheduling timer corresponding to the side uplink process supporting HARQ feedback, or the time length of the retransmission scheduling timer for which the TX UE expects to receive the CSI report has no overlapping portion, but the running time length of the retransmission scheduling timer corresponding to the side uplink process not supporting HARQ feedback of the third side uplink resource has an overlapping portion, the second side uplink resource can only be used for SL retransmission.

As described above, in the above implementation of scheme 2, when the TX UE determines the destination address through the SL LCP procedure, the running duration of the retransmission scheduling timer corresponding to the side uplink process that does not support HARQ feedback is not used as the activation time corresponding to the destination address.

Alternatively, as another implementation, the method of determining the activation time corresponding to the destination address by the TX UE in the SL LCP may also be applied to the process of selecting (or reselecting) resources by the TX UE. That is, when the TX UE performs resource selection (resource reselection), the operation time of the retransmission scheduling timer corresponding to the side uplink process that does not support HARQ feedback is not used as the activation time of the destination address. Or, the activation time determined by the TX UE for resource selection (resource reselection) does not include the running duration of the retransmission scheduling timer corresponding to the side uplink process that does not support HARQ feedback. It is understood that the resources include primary and/or retransmission resources.

In scheme 2, the operation duration of the retransmission scheduling timer corresponding to the side uplink process which does not support HARQ feedback is not considered in the activation time by the TX UE, so that the problem that new transmission data is sent to the RX UE in the retransmission scheduling timer by the TX UE and cannot be received by the RX UE due to the fact that the retransmission scheduling timer is not operated by the RX UE by the TX UE is avoided, and the quality of SL communication can be improved.

Scheme 3

For side-uplink processes that do not support HARQ feedback, the TX UE and the RX UE do not start a retransmission scheduling timer.

Considering that both a side-link process supporting HARQ feedback and a side-link process not supporting HARQ feedback may support a retransmission wait timer, on this basis, scheme 3 proposes that whether to start a retransmission scheduling timer corresponding to one side-link process may be determined according to whether the one side-link process supports HARQ feedback.

Referring to fig. 10, fig. 10 is a schematic flow chart diagram of another method of side-link communication provided herein.

510. The TX UE sends the SCI to the RX UE, the SCI containing an identification of the first side uplink procedure.

520. The TX UE processes a retransmission scheduling timer or a retransmission waiting timer of the first side-link process according to whether the first side-link process supports HARQ feedback.

The RX UE processes a retransmission scheduling timer or a retransmission waiting timer of the second side uplink process according to whether the second side uplink process supports HARQ feedback.

Wherein the second side uplink process is for processing SCI scheduled data. The second side uplink process is associated with the first side uplink process.

Step 520 is described below for TX UE and RX UE, respectively.

(1)TX UE

One implementation is shown in fig. 11 (a), where fig. 11 (a) is a schematic flow of a timer corresponding to a transmission terminal processing side uplink process.

The TX UE transmits an SCI containing an identification of the first side uplink procedure. Optionally, if the first side link process supports HARQ feedback, the TX UE starts a retransmission waiting timer corresponding to the first side link process at a symbol or slot after the PSFCH transmission ends (or after the PSFCH resource ends) if the TX UE receives HARQ feedback from the RX UE that is successfully decoded for SCI scheduled data, or if the TX UE does not receive HARQ feedback. When the retransmission waiting timer expires, the TX UE determines whether the first side uplink process supports HARQ feedback.

If the first side link process supports HARQ feedback, the TX UE starts a retransmission scheduling timer corresponding to the first side link process. Specifically, if the TX UE receives the HARQ feedback for the SCI scheduled data from the RX UE as NACK or the TX UE does not receive the HARQ feedback, the TX UE starts a retransmission scheduling timer corresponding to the first side uplink process.

If the first side link process does not support HARQ feedback, the TX UE does not start a retransmission scheduling timer corresponding to the first side link process.

In particular, when the TX UE receives the HARQ feedback from the RX UE as an Acknowledgement (ACK), the TX UE does not start the retransmission scheduling timer corresponding to the first side uplink process after the retransmission waiting timer expires, and does not determine whether the first side uplink process supports the HARQ feedback.

It should be understood that the steps corresponding to the dashed boxes in fig. 11 (a) are shown as optional cases.

Another implementation is shown in fig. 11 (b), where fig. 11 (b) is another schematic flow of the timer corresponding to the transmission terminal processing side uplink process.

The TX UE transmits an SCI containing an identification of the first side uplink procedure. After the TX UE transmits the SCI, it is determined whether the first side-link procedure supports HARQ feedback.

If the first side link process supports HARQ feedback, the TX UE starts a retransmission waiting timer corresponding to the first side link process; if the first side link process does not support HARQ feedback, the TX UE does not start a retransmission waiting timer corresponding to the first side link process.

(2)RX UE

One implementation is shown in fig. 12 (a), where fig. 12 (a) is an exemplary flow of a timer corresponding to a receiving terminal processing side uplink process.

The RX UE receives the SCI, which contains an identification of the first side uplink process. Alternatively, if the second side uplink process supports HARQ feedback, the RX UE sends HARQ feedback to the TX UE whether the data scheduled for SCI was successfully decoded. And starting a retransmission waiting timer corresponding to the second side uplink process at a symbol or a time slot after PSFCH transmission is finished (or PSFCH resources are finished). When the retransmission wait timer expires and the SCI scheduled data is not successfully decoded, the TX UE determines whether the second side uplink process supports HARQ feedback.

If the second side uplink supports HARQ feedback, the RX UE starts a retransmission scheduling timer corresponding to the second side uplink. Specifically, the RX UE starts a retransmission scheduling timer corresponding to the second side uplink process if the RX UE does not successfully decode the SCI scheduled data (i.e., the HARQ feedback sent by the RX UE is specifically NACK) or the RX UE does not send the HARQ feedback.

If the second side uplink does not support HARQ feedback, the RX UE does not start a retransmission scheduling timer corresponding to the second side uplink.

Specifically, when the HARQ feedback sent to the TX UE is ACK, the RX UE does not start the retransmission scheduling timer corresponding to the first side uplink process after the retransmission waiting timer expires, and does not determine whether the second side uplink process supports HARQ feedback.

Likewise, the steps corresponding to the dashed boxes in fig. 12 (a) are indicated as optional cases.

Another implementation is shown in fig. 12 (b), where fig. 12 (b) is another schematic flow of the timer corresponding to the processing side uplink process of the receiving terminal.

The RX UE receives the SCI, which contains an identification of the first side uplink process. After receiving the SCI, the RX UE determines whether the second side uplink process supports HARQ feedback.

If the second side uplink process supports HARQ feedback, the RX UE starts a retransmission waiting timer of the second side uplink process; if the second side uplink process does not support HARQ feedback, the RX UE does not start a retransmission waiting timer corresponding to the second side uplink process.

In the above scheme 3, for the side uplink process that does not support HARQ feedback, the TX UE and the RX UE do not operate the retransmission scheduling timer corresponding to the side uplink process, which can avoid the problem that the RX UE may not receive new transmission data sent by the TX UE because the starting (or operation) of the retransmission scheduling timers of the TX UE and the RX UE are not synchronous, and can improve the communication quality of SL. In addition, the power consumption caused by meaningless running of the retransmission scheduling timer of the side uplink process which does not support the HARQ feedback by the RX UE can also be avoided.

The method of side-link communication provided by the present application is described in detail above, and the communication device provided by the present application is described below.

Referring to fig. 13, fig. 13 is a schematic block diagram of a communication device provided in the present application. As shown in fig. 13, the communication apparatus 1000 includes a processing unit 1100, a receiving unit 1200, and a transmitting unit 1300.

Alternatively, the communication apparatus 1000 may correspond to a transmitting terminal in the embodiment of the present application.

In some aspects, the units of the communications device 1000 are configured to perform the following functions:

a transmitting unit 1300 configured to transmit, to a second terminal device, first information indicating a retransmission number threshold and/or a starting number threshold of a retransmission scheduling timer for data of a first side uplink, the first side uplink being a communication link between the communication device and the second terminal device;

and transmitting side-link control information SCI to the second terminal device through the first side-link, the SCI including an identification of a first side-link process

And a processing unit 1100, configured to process a retransmission scheduling timer or a retransmission waiting timer corresponding to the first side uplink process according to the first information.

Optionally, in one embodiment, the processing unit 1100 is specifically configured to:

according to the first information, under the condition that the first condition is met, after the retransmission waiting timer corresponding to the first side link process is overtime, a retransmission scheduling timer corresponding to the first side link process is not started; or alternatively, the process may be performed,

according to the first information, under the condition that the first condition is not met, starting a retransmission scheduling timer corresponding to the first side link process after the retransmission waiting timer corresponding to the first side link process is overtime,

Wherein the first condition includes at least one of:

the current retransmission times of the SCI scheduled data reach the retransmission times threshold value; or alternatively, the process may be performed,

and the current starting times of the retransmission scheduling timer corresponding to the first side link process corresponding to the SCI reach the starting times threshold.

according to the first information, under the condition that the first condition is met, after the SCI is sent, a retransmission waiting timer corresponding to the first side uplink process is not started; or alternatively, the process may be performed,

according to the first information, under the condition that the first condition is not met, starting a retransmission waiting timer corresponding to the first side uplink process after the SCI is sent;

wherein the first condition includes at least one of:

Optionally, in one embodiment, the first information is for the first side-link process, wherein the first terminal device includes a plurality of side-link processes, and the first side-link process is one of the plurality of side-link processes.

Optionally, in an embodiment, the sending unit 1300 is further configured to send the first information to an access network device.

Optionally, in an embodiment, the receiving unit 1200 is further configured to receive the first information from an access network device.

In other aspects, the units of the communications device 1000 are configured to perform the following functions:

a processing unit 1100 for:

acquiring a first side uplink resource;

and determining a destination address, the destination address corresponding to a second terminal device, the time domain of the first side link resource overlapping or partially overlapping with the activation time of the destination address,

the running time of the continuous timer of the destination address, the running time of the non-activated timer, the running time of a retransmission scheduling timer of a side uplink process supporting HARQ feedback or the time of the communication device expecting to receive the Channel State Information (CSI) report belongs to the activation time;

And performing side-link communication with the second terminal device according to the activation time.

Optionally, in one embodiment, if a first timer is in an operation state within an operation duration of a retransmission scheduling timer of the side uplink process that does not support HARQ feedback, the activation time includes an operation duration of the first timer, where the first timer includes a persistent timer, an inactivity timer, or a retransmission scheduling timer of a third side uplink process that supports HARQ feedback; or alternatively, the process may be performed,

and in the operation time length of the retransmission scheduling timer of the side uplink process which does not support HARQ feedback, the first terminal device is in a state of expecting to receive the CSI report, and the activation time comprises the time length of expecting to receive the CSI report by the first terminal device.

Optionally, in an embodiment, the processing unit 1100 is further configured to acquire a second side uplink resource;

wherein the second side uplink resource is not available in the following case:

there is no overlapping portion of the time domain of the second side uplink resource with any one of the running duration of the duration timer of any destination address, the running duration of the inactivity timer, the running duration of the retransmission scheduling timer of the side uplink process supporting HARQ feedback or the duration of the time period in which the first terminal device expects to receive the CSI report,

a transmitting unit 1300 for transmitting side uplink control information SCI to the second terminal device, the SCI containing an identification of the first side uplink process;

a processing unit 1100, configured to determine whether the first side uplink process supports HARQ feedback;

and under the condition that the first side link process does not support HARQ feedback, not starting a retransmission waiting timer or a retransmission scheduling timer corresponding to the first side link process;

and starting a retransmission waiting timer or a retransmission scheduling timer corresponding to the first side link process under the condition that the first side link process supports HARQ feedback.

under the condition that the first side link process does not support HARQ feedback, under the condition that a retransmission waiting timer corresponding to the first side link process is overtime, a retransmission scheduling timer corresponding to the first side link process is not started; or alternatively, the process may be performed,

And under the condition that the first side link process does not support HARQ feedback, after the SCI is sent, a retransmission waiting timer corresponding to the first side link process is not started.

when the first side link process supports HARQ feedback, the first terminal device starts a retransmission scheduling timer corresponding to the first side link process when a retransmission waiting timer corresponding to the first side link process is exceeded; or alternatively, the process may be performed,

in the case that the first side link process supports HARQ feedback, the first terminal device starts a retransmission waiting timer corresponding to the first side link process after transmitting the SCI.

Alternatively, the communication apparatus 1000 may correspond to a receiving terminal in the embodiment of the present application.

a receiving unit 1200, configured to receive first information from a first terminal device, where the first information is used to indicate a retransmission number threshold and/or a starting number threshold of a retransmission scheduling timer for data of a first side uplink, where the first side uplink is a communication link between the first terminal device and the second terminal device;

And receiving side-uplink control information SCI from the second terminal device over the first side-link, the SCI containing an identification of a first side-link procedure;

and a processing unit 1100, configured to process, according to the first information, a retransmission scheduling timer or a retransmission waiting timer corresponding to a second side uplink process, where the second side uplink process is used to process the SCI scheduled data, and the first side uplink process is associated with the second side uplink process.

Optionally, in one embodiment, the processing unit 100 is specifically configured to:

according to the first information, under the condition that the first condition is met, after the retransmission waiting timer corresponding to the second side uplink process is overtime, the retransmission scheduling timer corresponding to the second side uplink process is not started; or alternatively, the process may be performed,

according to the first information, under the condition that the first condition is not met, starting the retransmission scheduling timer corresponding to the second side uplink process after the retransmission waiting timer corresponding to the second side uplink process is overtime;

wherein the first condition includes at least one of:

and the current starting times of the retransmission scheduling timer corresponding to the second side uplink process corresponding to the SCI reach the starting times threshold.

according to the first information, under the condition that the first condition is met, after receiving the SCI, not starting a retransmission waiting timer corresponding to the second side uplink process; or alternatively, the process may be performed,

according to the first information, in the case that the first condition is not met, starting a retransmission waiting timer corresponding to the second side uplink process after receiving the SCI;

wherein the first condition includes at least one of:

Optionally, in one embodiment, the first information is for the first side-uplink process.

A receiving unit 1200 for receiving side-uplink control information SCI from a first terminal device, the SCI including an identification of a first side-uplink procedure;

a processing unit 1100, configured to determine whether a second side uplink process supports HARQ feedback, where the second side uplink process is configured to process the SCI scheduled data, and the second side uplink process is associated with the first side uplink process;

and under the condition that the first side link process does not support HARQ feedback, not starting a retransmission waiting timer or a retransmission scheduling timer corresponding to the first side link process; or alternatively, the process may be performed,

under the condition that the first side link process does not support HARQ feedback, under the condition that a retransmission waiting timer corresponding to the first side link process is overtime and the data scheduled by the SCI is not successfully decoded, a retransmission scheduling timer corresponding to the first side link process is not started; or alternatively, the process may be performed,

In the case where the first side uplink process does not support HARQ feedback, after the receiving unit 1200 receives the SCI, a retransmission waiting timer corresponding to the first side uplink process is not started.

under the condition that the first side link process supports HARQ feedback, starting a retransmission scheduling timer corresponding to the first side link process under the condition that a retransmission waiting timer corresponding to the first side link process is overtime and the SCI scheduled data is not successfully decoded; or alternatively, the process may be performed,

in the case where the first side link process supports HARQ feedback, after the receiving unit 1200 receives the SCI, a retransmission waiting timer corresponding to the first side link process is started.

In the above embodiments, the receiving unit 1200 and the transmitting unit 1300 may be integrated into one transceiver unit, and have both functions of receiving and transmitting, which is not limited herein.

In embodiments of the communication apparatus 1000 corresponding to a transmitting terminal (or a first terminal), the processing unit 1100 is configured to perform processing and/or operations that are internally implemented by the transmitting terminal in addition to actions of transmitting and receiving. The reception unit 1200 is configured to perform an operation of receiving a transmission terminal, and the transmission unit 1300 is configured to perform an operation of transmitting a transmission terminal.

For example, in fig. 6, a processing unit 1100 is used to perform step 240. The transmission unit 1300 is for performing the operation of the transmission in step 210 or step 230. Optionally, the sending unit 1300 is configured to perform the operation of sending the first information to the access network device in step 220. Optionally, the receiving unit 1200 is configured to perform the operation of receiving the first information from the access network device in step 220.

Also for example, in fig. 7, a processing unit 1100 is used to perform steps 310 and 320. The transmission unit 1300 is for performing the operation of the transmission referred to in step 330, and the reception unit 1200 is for performing the operation of the reception referred to in step 330.

Also for example, in fig. 10, a processing unit 1100 is used to perform step 520. The transmitting unit 1300 is configured to perform step 510.

In embodiments of the communication apparatus 1000 corresponding to a receiving terminal (or a second terminal), the processing unit 1100 is configured to perform processing and/or operations that are internally implemented by the receiving terminal in addition to actions of transmitting and receiving. The reception unit 1200 is configured to perform an operation of receiving a reception terminal, and the transmission unit 1300 is configured to perform an operation of transmitting a reception terminal.

For example, in fig. 6, a processing unit 1100 is used to perform step 240. The receiving unit 1200 is for performing the operation of the reception in step 210 or step 230.

Also for example, in fig. 10, a processing unit 1100 is used to perform step 520. The receiving unit 1200 is configured to perform step 510.

Referring to fig. 14, fig. 14 is a schematic structural diagram of a communication device provided in the present application. As shown in fig. 14, the communication apparatus 10 includes: one or more processors 11, one or more memories 12, and one or more communication interfaces 13. The processor 11 is configured to control the communication interface 13 to transmit and receive signals, the memory 12 is configured to store a computer program, and the processor 11 is configured to call and execute the computer program from the memory 12, so that the communication device 10 performs the processing performed by the transmitting terminal or the receiving terminal in the embodiments of the method of the present application.

For example, the processor 11 may have the functions of the processing unit 1100 shown in fig. 13, and the communication interface 13 may have the functions of the receiving unit 1200 and/or the transmitting unit 1300 shown in fig. 13. In particular, the processor 11 may be used to perform processes or operations performed internally by the communication device, and the communication interface 13 is used to perform operations of transmission and/or reception of the communication device.

In one implementation, the communication device 10 may be a transmitting terminal in a method embodiment. In such an implementation, the communication interface 13 may be a transceiver of the transmitting terminal. The transceiver may include a receiver and/or a transmitter. Alternatively, the processor 11 may be a baseband device of the transmitting terminal, and the communication interface 13 may be a radio frequency device.

In another implementation, the communication device 10 may be a chip (or chip system) installed in a transmitting terminal. In such an implementation, the communication interface 13 may be an interface circuit or an input/output interface.

In one implementation, the communication device 10 may be a receiving terminal in a method embodiment. In such an implementation, the communication interface 13 may be a transceiver of the receiving terminal. The transceiver may include a receiver and/or a transmitter. Alternatively, the processor 11 may be a baseband device of the receiving terminal, and the communication interface 13 may be a radio frequency device.

In another implementation, the communication device 10 may be a chip (or chip system) installed in a receiving terminal. In such an implementation, the communication interface 13 may be an interface circuit or an input/output interface.

Wherein the dashed box behind a device (e.g., a processor, memory, or communication interface) in fig. 14 indicates that the device may be more than one.

Alternatively, the memory and the processor in the above apparatus embodiments may be physically separate units, or the memory may be integrated with the processor, which is not limited herein.

Furthermore, the present application also provides a computer-readable storage medium, in which computer instructions are stored, which when executed on a computer, cause operations and/or processes performed by a transmitting terminal in the method embodiments of the present application to be performed.

The present application also provides a computer-readable storage medium having stored therein computer instructions that, when executed on a computer, cause operations and/or processes performed by a receiving terminal in method embodiments of the present application to be performed.

Furthermore, the present application also provides a computer program product, which comprises computer program code or instructions which, when run on a computer, cause operations and/or processes performed by a transmitting terminal in the method embodiments of the present application to be performed.

The present application also provides a computer program product comprising computer program code or instructions which, when run on a computer, cause operations and/or processes performed by a receiving terminal in the method embodiments of the present application to be performed.

Furthermore, the present application also provides a chip, where the chip includes a processor, and a memory for storing a computer program is provided separately from the chip, and the processor is configured to execute the computer program stored in the memory, so that a terminal device installed with the chip performs an operation and/or a process performed by a transmitting terminal in any one of the method embodiments.

Further, the chip may also include a communication interface. The communication interface may be an input/output interface, an interface circuit, or the like. Further, the chip may further include the memory.

The present application also provides a chip including a processor, where a memory for storing a computer program is provided separately from the chip, and the processor is configured to execute the computer program stored in the memory, so that a terminal device on which the chip is installed performs operations and/or processes performed by a receiving terminal in any one of the method embodiments.

In the alternative, the processor may be one or more, the memory may be one or more, and the memory may be one or more.

In addition, the application further provides a communication device (for example, may be a chip or a chip system), including a processor and a communication interface, where the communication interface is configured to receive (or refer to as input) data and/or information, and transmit the received data and/or information to the processor, where the processor processes the data and/or information, and the communication interface is further configured to output (or refer to as output) the data and/or information processed by the processor, so that an operation and/or processing performed by the sending terminal in any method embodiment is performed.

The present application also provides a communication device (e.g., may be a chip or a chip system) including a processor and a communication interface for receiving (or referred to as inputting) data and/or information and transmitting the received data and/or information to the processor, the processor processing the data and/or information, and the communication interface further for outputting (or referred to as outputting) the data and/or information after being processed by the processor, such that operations and/or processing performed by the receiving terminal in any of the method embodiments are performed.

Furthermore, the present application provides a communication device, including at least one processor, where the at least one processor is coupled to at least one memory, and the at least one processor is configured to execute a computer program or instructions stored in the at least one memory, so that the communication device performs operations and/or processes performed by a transmitting terminal in any one of the method embodiments.

The present application also provides a communication device comprising at least one processor coupled to at least one memory, the at least one processor configured to execute computer programs or instructions stored in the at least one memory, such that the communication device performs the operations and/or processes performed by a receiving terminal in any of the method embodiments.

In addition, the application also provides communication equipment which comprises a processor and a memory. Optionally, a transceiver may also be included. The memory is used for storing a computer program, and the processor is used for calling and running the computer program stored in the memory and controlling the transceiver to transmit and receive signals so as to enable the communication device to execute the operation and/or the process executed by the transmitting terminal in any method embodiment.

The application also provides a communication device comprising a processor and a memory. Optionally, a transceiver may also be included. The memory is used for storing a computer program, and the processor is used for calling and running the computer program stored in the memory and controlling the transceiver to transmit and receive signals so as to enable the communication device to execute the operation and/or the process executed by the receiving terminal in any method embodiment.

In addition, the application also provides a wireless communication system which comprises the sending terminal and the receiving terminal in the embodiment of the method. Optionally, the wireless communication system further comprises a wireless access network device.

The memory in embodiments of the present application may be either volatile memory or nonvolatile memory, or may include both volatile and nonvolatile memory. The nonvolatile memory may be a read-only memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an electrically Erasable EPROM (EEPROM), or a flash memory. The volatile memory may be random access memory (random access memory, RAM) which acts as an external cache. By way of example, and not limitation, many forms of RAM are available, such as Static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous DRAM (SLDRAM), and direct memory bus RAM (DRRAM). It should be noted that the memory of the systems and methods described herein is intended to comprise, without being limited to, these and any other suitable types of memory.

The methods provided by the above embodiments may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product may include one or more computer instructions. When loaded and executed on a computer, produces a flow or function in accordance with embodiments of the present application, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable apparatus. The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center by a wired (e.g., coaxial cable, fiber optic, digital subscriber line (digital subscriber line, DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. that contains an integration of one or more available media.

In order to clearly describe the technical solutions of the embodiments of the present application, in the embodiments of the present application, the same items or similar items having substantially the same functions and actions are distinguished by using numbers such as "first", "second", and the like. For example, the first side-link process and the second side-link process are merely to distinguish between the two side-link processes. It will be understood by those skilled in the art that the numbers of "first", "second", etc. are not limiting on the numbers, and that the words of "first", "second", etc. are not necessarily different.

In the embodiment of the present application, "and/or" describes an association relationship of an association object, which indicates that three relationships may exist, for example, a and/or B may indicate: a alone, a and B together, and B alone, wherein a, B may be singular or plural. The character "/" generally indicates that the context-dependent object is an "or" relationship. "at least one item" or the like, refers to any combination of these items, including any combination of single item(s) or plural items(s). For example, at least one (one) of a, b, or c may represent: a, b, c; a and b; a and c; b and c; or a and b and c. Wherein a, b and c can be single or multiple.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

It will be clear to those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described systems, apparatuses and units may refer to corresponding procedures in the foregoing method embodiments, and are not repeated herein.

In the several embodiments provided in this application, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of the units is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.

In addition, each functional unit in each embodiment of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit.

The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer-readable storage medium. Based on such understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.

The foregoing is merely specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think about changes or substitutions within the technical scope of the present application, and the changes and substitutions are intended to be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A method of side-link communication, comprising:

a first terminal device sends first information to a second terminal device, wherein the first information is used for indicating a retransmission time threshold value and/or a starting time threshold value of a retransmission scheduling timer of data of a first side uplink, and the first side uplink is a communication link between the first terminal device and the second terminal device;

the first terminal device transmitting side-uplink control information SCI to the second terminal device over the first side-link, the SCI containing an identification of a first side-link procedure;

and the first terminal device processes a retransmission scheduling timer or a retransmission waiting timer corresponding to the first side uplink process according to the first information.

2. The method of claim 1, wherein the first terminal device processing the retransmission scheduling timer corresponding to the first side-link procedure according to the first information comprises:

the first terminal device does not start a retransmission scheduling timer corresponding to the first side link process after the retransmission waiting timer corresponding to the first side link process is overtime under the condition that the first condition is met according to the first information; or alternatively, the process may be performed,

The first terminal device starts a retransmission scheduling timer corresponding to the first side link process after the retransmission waiting timer corresponding to the first side link process is overtime under the condition that the first condition is not satisfied according to the first information,

wherein the first condition includes at least one of:

3. The method of claim 1, wherein the first terminal device processing the retransmission wait timer corresponding to the first side-link procedure according to the first information comprises:

the first terminal device does not start a retransmission waiting timer corresponding to the first side link process after sending the SCI according to the first information under the condition that the first condition is met; or alternatively, the process may be performed,

the first terminal device starts a retransmission waiting timer corresponding to the first side uplink process after sending the SCI according to the first information if the first condition is not met;

Wherein the first condition includes at least one of:

4. A method according to any of claims 1-3, wherein the first information is for the first side-link process, wherein the first terminal device comprises a plurality of side-link processes, the first side-link process being one of the plurality of side-link processes.

5. The method of any one of claims 1-4, wherein the method further comprises:

the first terminal device sends the first information to an access network device.

6. The method of any one of claims 1-4, wherein the method further comprises:

the first terminal device receives the first information from the access network equipment.

7. A method of side-link communication, comprising:

the second terminal device receives first information from a first terminal device, wherein the first information is used for indicating a retransmission time threshold value and/or a starting time threshold value of a retransmission scheduling timer of data of a first side link, and the first side link is a communication link between the first terminal device and the second terminal device;

The second terminal device receives side-link control information SCI from the first terminal device through the first side-link, the SCI including an identification of a first side-link process;

and the second terminal device processes a retransmission scheduling timer or a retransmission waiting timer corresponding to a second side uplink process according to the first information, wherein the second side uplink process is used for processing the SCI scheduled data, and the first side uplink process and the second side uplink process are associated.

8. The method of claim 7, wherein the second terminal device processing the retransmission scheduling timer corresponding to the second side uplink process according to the first information, comprises:

the second terminal device does not start the retransmission scheduling timer corresponding to the second side uplink process after the retransmission waiting timer corresponding to the second side uplink process is overtime under the condition that the first condition is met according to the first information; or alternatively, the process may be performed,

the second terminal device starts the retransmission scheduling timer corresponding to the second side uplink process after the retransmission waiting timer corresponding to the second side uplink process is overtime under the condition that the first condition is not met according to the first information;

Wherein the first condition includes at least one of:

9. The method of claim 7, wherein the second terminal device processing the retransmission wait timer corresponding to the second side uplink process according to the first information, comprises:

the second terminal device does not start a retransmission waiting timer corresponding to the second side uplink process after receiving the SCI according to the first information if it is determined that the first condition is satisfied; or alternatively, the process may be performed,

the second terminal device starts a retransmission waiting timer corresponding to the second side uplink process after receiving the SCI according to the first information if it is determined that the first condition is not satisfied;

wherein the first condition includes at least one of:

10. The method of any of claims 7-9, wherein the first information is for the first side-link process.

11. A method of side-link communication, comprising:

the first terminal device acquires a first side uplink resource;

the first terminal device determines a destination address corresponding to the second terminal device, the time domain of the first side-link resource having an overlap or partial overlap with the activation time of the destination address,

the running time of the continuous timer of the destination address, the running time of the non-activated timer, the running time of a retransmission scheduling timer of a side uplink process supporting HARQ feedback or the time of the first terminal device expecting to receive a Channel State Information (CSI) report belongs to the activation time;

12. The method of claim 11, wherein the activation time comprises an operation duration of a first timer if the first timer is in an operation state, wherein the first timer comprises a persistent timer, an inactive timer, or a retransmission scheduling timer of a third side uplink process supporting HARQ feedback, within an operation duration of a retransmission scheduling timer of the side uplink process not supporting HARQ feedback; or alternatively, the process may be performed,

13. The method of claim 11 or 12, wherein the method further comprises:

the first terminal device acquires a second side uplink resource;

wherein the second side uplink resource is not available in the following case:

14. A terminal apparatus, comprising:

a transmitting unit configured to transmit, to a second terminal device, first information indicating a retransmission number threshold and/or a starting number threshold of a retransmission scheduling timer for data of a first side uplink, the first side uplink being a communication link between the terminal device and the second terminal device;

and transmitting side uplink control information SCI to the second terminal device over the first side uplink, the SCI containing an identification of a first side uplink process;

and the processing unit is used for processing a retransmission scheduling timer or a retransmission waiting timer corresponding to the first side link process according to the first information.

15. The terminal device of claim 14, wherein the processing unit is specifically configured to:

wherein the first condition includes at least one of:

16. The terminal device of claim 14, wherein the processing unit is specifically configured to:

wherein the first condition includes at least one of:

17. The terminal device of any of claims 14-16, wherein the first information is for the first side-link process, wherein the first terminal device comprises a plurality of side-link processes, the first side-link process being one of the plurality of side-link processes.

18. The terminal device according to any of the claims 14-17, wherein the transmitting unit is further configured to:

and sending the first information to access network equipment.

19. The terminal device according to any of the claims 14-17, wherein the terminal device further comprises:

and the receiving unit is used for receiving the first information from the access network equipment.

20. A terminal apparatus, comprising:

a receiving unit configured to receive first information from a first terminal device, where the first information is used to indicate a retransmission number threshold and/or a starting number threshold of a retransmission scheduling timer for data of a first side uplink, and the first side uplink is a communication link between the first terminal device and the terminal device;

And receiving side-uplink control information SCI from the first terminal device over the first side-link, the SCI containing an identification of a first side-link procedure;

and the processing unit is used for processing a retransmission scheduling timer or a retransmission waiting timer corresponding to a second side uplink process according to the first information, wherein the second side uplink process is used for processing the SCI scheduled data, and the first side uplink process and the second side uplink process are associated.

21. The terminal device of claim 20, wherein the processing unit is specifically configured to:

wherein the first condition includes at least one of:

22. The terminal device of claim 20, wherein the processing unit is specifically configured to:

wherein the first condition includes at least one of:

23. The terminal device of any of claims 20-22, wherein the first information is for the first side-link procedure.

24. A terminal apparatus, comprising:

a processing unit, configured to acquire a first side uplink resource;

and controlling a transmitting unit and/or a receiving unit to perform side-link communication with the second terminal device according to the activation time.

25. A communication device comprising at least one processor coupled to at least one memory, the at least one processor configured to execute a computer program or instructions stored in the at least one memory to cause the communication device to perform the method of any one of claims 1-13.

26. A chip comprising a processor and a communication interface for receiving data and/or information and transmitting the received data and/or information to the processor, the processor processing the data and/or information to perform the method of any of claims 1-13.

27. A computer readable storage medium having stored therein computer instructions which, when run on a computer, cause the method of any of claims 1-13 to be implemented.

28. A computer program product, characterized in that the computer program product comprises computer program code which, when run on a computer, causes the method according to any one of claims 1-13 to be implemented.