CN114286310A

CN114286310A - Communication method, device and system

Info

Publication number: CN114286310A
Application number: CN202011116071.XA
Authority: CN
Inventors: 才宇; 徐海博
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2020-09-28
Filing date: 2020-10-16
Publication date: 2022-04-05

Abstract

The embodiment of the application provides a communication method, a communication device and a communication system, relates to the technical field of communication, and aims to solve the problems of how to avoid data packet transmission failure and avoid the waste of power consumption of a sender terminal. The method comprises the following steps: the first terminal determines one or more sidelink resources. The one or more sidelink resources comprise at least a sidelink resource located within a sidelink discontinuous reception-activation time of the second terminal. The first terminal transmits data to the second terminal on a first sidelink resource of the one or more sidelink resources, the first sidelink resource being located within a sidelink discontinuous reception-activation time of the second terminal. The scheme can be suitable for the fields of unmanned driving, automatic driving, auxiliary driving, intelligent driving, internet driving, intelligent internet driving, automobile sharing and the like.

Description

Communication method, device and system

The present application claims priority from the chinese patent application entitled "resource selection and use under SL DRX" filed by the national intellectual property office at 28/09/2020, application number 202011042899.5, the entire contents of which are incorporated herein by reference.

Technical Field

The embodiment of the application relates to the technical field of communication, in particular to a communication method, device and system.

Background

As the communication technology evolves and the internet of everything is accelerating, the third Generation Partnership Project (3 GPP) introduced vehicle-to-vehicle (V2V) and vehicle-to-everything (V2X) services support in Long Term Evolution (LTE) during Release 14 (Release, Rel-14) and Release15 in order to extend the 3GPP platform to the automotive industry. The sensing mechanism proposed by Rel-14V 2X senses the usage of the spectrum by a terminal, and selects the sidelink resource according to the data transmission of the terminal on the sidelink resource.

Although the sender terminal may obtain one or more sidelink resources by sensing the sidelink resources, the sender terminal may then determine, from the one or more sidelink resources, a sidelink resource that carries data when sending the data to the receiver terminal. However, the sender terminal selects the sidelink resource is mostly based on the consideration of the transmission requirement of the sender terminal itself, and although the sender terminal can successfully send data, the receiver terminal may fail to receive data due to various factors, which inevitably wastes the power consumption of the sender terminal.

Disclosure of Invention

The embodiment of the application provides a communication method, a communication device and a communication system, and the method is used for solving the problems of how to avoid data packet transmission failure and avoiding the waste of power consumption of a sender terminal.

In order to solve the above technical problem, an embodiment of the present application provides the following technical solutions:

in a first aspect, an embodiment of the present application provides a communication method, where the method is applied in a first terminal, and the method includes: the first terminal determines one or more sidelink resources. Wherein the one or more sidelink resources comprise at least a sidelink resource located within a sidelink discontinuous reception-activation time of the second terminal. The first terminal transmits data to the second terminal on a first sidelink resource of the one or more sidelink resources. The first sidelink resource is located within a sidelink discontinuous reception-activation time.

The embodiment of the application provides a communication method, wherein a first terminal firstly determines one or more side link resources. The first terminal then transmits data to the second terminal on a first sidelink resource of the one or more sidelink resources. The first sidelink resource is located in the sidelink DRX-activated time of the second terminal, and the second terminal is in an activated state at the sidelink DRX-activated time of the second terminal. Therefore, when the first terminal sends data on the first side uplink resource, the second terminal is in a state of being capable of receiving the data, data transmission failure can be avoided, and power consumption caused by the fact that the first terminal sends the data can be avoided being wasted.

In one possible implementation manner of the present application, the number of sidelink resources located within the first time period in the one or more sidelink resources is greater than or equal to a first threshold. The starting time of the first time period is the starting time corresponding to the candidate resource set, or the starting time of the first time period is the starting time of the discontinuous reception-activation time of the sidelink, and the ending time of the first time period is the ending time of the discontinuous reception-activation time of the sidelink. This ensures that a certain amount of sidelink resources are available for the first terminal to select resources for transmitting the data during the sidelink drx-active time.

In one possible implementation manner of the present application, the one or more sidelink resources are sidelink resources determined from a candidate resource set, and a starting time corresponding to the candidate resource set is later than or equal to a starting time of the sidelink discontinuous reception-activation time. The starting time corresponding to the candidate resource set is later than or equal to the starting time of the sidelink discontinuous reception-activation time, so that the sidelink resources in the candidate resource set can be ensured to be positioned after the starting time of the sidelink discontinuous reception-activation time.

In a possible implementation manner of the present application, a deadline time corresponding to the candidate resource set is later than or equal to an end time of the sidelink drx-drx activation time, so that it can be ensured that the one or more sidelink resources determined by the first terminal include a resource located at the sidelink drx-activation time.

In one possible implementation manner of the present application, the one or more sidelink resources are sidelink resources determined from a candidate resource set, and a deadline corresponding to the candidate resource set is earlier than or equal to a retransmission end time of the data. The deadline time corresponding to the candidate resource set is earlier than or equal to the retransmission ending time of the data, so that the first terminal can be ensured to select the resource for retransmitting the data from the candidate resource set.

In one possible implementation manner of the present application, the determining, by the first terminal, one or more sidelink resources includes: the physical layer of the first terminal determines one or more sidelink resources from the candidate sidelink resources. The physical layer reports one or more sidelink resources to a media access control entity of the first terminal. The method provided by the embodiment of the application can further comprise the following steps: the media access control entity selects a first sidelink resource located within a sidelink discontinuous reception-activation time of the second terminal from the one or more sidelink resources.

In a possible implementation manner of the present application, the method provided in the embodiment of the present application further includes: the medium access control entity sends the first information to the physical layer. The first information includes: information indicating an end time of the sidelink DRX-active time or information indicating a remaining time of the sidelink DRX-active time. The physical layer of the first terminal determines one or more sidelink resources from the candidate sidelink resources, including: the physical layer determines one or more sidelink resources from the candidate sidelink resources based on the first information. The physical layer of the first terminal refers to the first information when reporting one or more sidelink resources to the media access control entity of the first terminal, so that the sidelink resources located within the discontinuous reception-activation time of the sidelink exist in the reported one or more sidelink resources.

In a possible implementation manner of the present application, the sending, by a media access control entity, first information to a physical layer includes: and when the remaining time of the discontinuous reception-activation time of the side link is less than or equal to the remaining packet delay budget, the media access control entity sends first information to the physical layer.

In one possible implementation manner of the present application, the medium access control entity does not send the first information to the physical layer. The physical layer may then determine candidate sidelink resources from the candidate set of resources and then determine one or more sidelink resources from the candidate sidelink resources. At this time, because the first information is not referred to in one or more sidelink resources reported by the physical layer, there may be a resource that includes the discontinuous reception-activation time of the sidelink in the one or more sidelink resources, or there may be a resource that does not include the discontinuous reception-activation time of the sidelink. And the media access control entity judges whether the resources positioned at the side-link discontinuous reception-activation time exist according to the side-link discontinuous reception-activation time of the second terminal.

In one possible implementation manner of the present application, when the remaining time of the sidelink drx-drx activation time is greater than or equal to the remaining packet delay budget, the mac entity does not send the first information to the physical layer.

In one possible implementation manner of the present application, the first information further includes: information indicating a start time of a sidelink discontinuous reception-activation time. Therefore, the physical layer can conveniently determine the starting time of the discontinuous reception-activation time of the sidelink, thereby ensuring that the sidelink resource reported to the media access control entity is positioned in the discontinuous reception-activation time of the sidelink as far as possible. For example, the one or more sidelink resources include resources that are less than a first time threshold away from a start time of the sidelink drx-activation time.

In a possible implementation manner of the present application, when the time unit 1 is located before the start time of the sidelink discontinuous reception-activation time, the mac entity of the first terminal sends information indicating the start time of the sidelink discontinuous reception-activation time to the physical layer of the first terminal, and the time unit 1 determines a time for sensing sidelink resources for the physical layer of the first terminal.

In a possible implementation manner of the present application, the method provided in the embodiment of the present application further includes: the medium access control entity of the first terminal does not transmit information indicating a start time of the sidelink discontinuous reception-activation time to a physical layer of the first terminal.

In a possible implementation manner of the present application, when the time unit 1 is located within the starting time of the sidelink discontinuous reception-activation time, the mac entity of the first terminal does not send information indicating the starting time of the sidelink discontinuous reception-activation time to the physical layer of the first terminal, and the time unit 1 determines a time for sensing sidelink resources for the physical layer of the first terminal.

In one possible implementation manner of the present application, the method provided by the present application may further include: the first terminal determines a retransmission end time of the data or a remaining retransmission time of the data. And the first terminal determines the ending time corresponding to the candidate resource set according to the retransmission ending time or the residual retransmission time, wherein the ending time corresponding to the candidate resource set is earlier than or equal to the residual retransmission time.

In one possible implementation manner of the present application, the method provided by the present application may further include: and the media access control entity of the first terminal sends the second information to the physical layer. The second information is used for indicating the retransmission ending time of the data or indicating the remaining retransmission time of the data. The determining, by the first terminal, a retransmission end time of the data or a remaining retransmission time of the data includes: and the physical layer of the first terminal determines the retransmission ending time or the residual retransmission time according to the second information.

In one possible implementation manner of the present application, the second information is a retransmission end time or a remaining retransmission time. The process of calculating the retransmission ending time or the residual retransmission time by the physical layer is omitted.

In a possible implementation manner of the present application, the second information is at least one of a retransmission number of data, an RTT timer duration, and a retransmission timer duration. In the scheme, the physical layer calculates the retransmission end time or the residual retransmission time.

In one possible implementation manner of the present application, the retransmission end time is equal to the end time of the sidelink discontinuous reception-activation time + (RTT timer duration + retransmission timer duration) × the number of retransmissions. Or the retransmission ending time is equal to the ending time of the discontinuous reception-activation time of the sidelink + the retransmission timer duration.

In one possible implementation of the present application, if the remaining packet delay budget is less than the first value or the remaining packet delay budget is less than the remaining retransmission time, the medium access control entity provides the physical layer with a minimum value of the remaining packet delay budget and the retransmission end time.

In one possible implementation manner of the present application, the method provided in the embodiment of the present application further includes: if the number of sidelink resources located within the first time period is less than or equal to the first threshold, the threshold of whether the candidate sidelink resources are excluded is updated. The first terminal determines one or more sidelink resources from the candidate sidelink resources according to the updated threshold. This may ensure that the number of sidelink resources located within the first time period is greater than or equal to the first threshold.

In one possible implementation manner of the present application, the number of sidelink resources located within the second time period in the one or more sidelink resources is greater than or equal to a second threshold; the second time period is determined by the deadline of the discontinuous reception-activation time of the sidelink and the corresponding deadline of the candidate resource set.

In a possible implementation manner of the present application, the first sidelink resource is used for initially transmitting data, and the method provided in the embodiment of the present application further includes: the first terminal determines second sidelink resources for retransmitting the data. The second sidelink resource is located within the sidelink discontinuous reception-activation time or within a third time period. Wherein the third time period is determined according to the first sidelink resource. Therefore, when the data transmission fails, the first terminal can adopt the second sidelink resource to retransmit the data, and the success rate of data transmission is improved.

In one possible implementation of the present application, a time interval between the first sidelink resource and the second sidelink resource is greater than or equal to a minimum time interval.

In a possible implementation manner of the present application, when a resource pool in which the first sidelink resource and the second sidelink resource are located configures a physical sidelink feedback control channel resource, a time interval between the first sidelink resource and the second sidelink resource is greater than or equal to a minimum time interval.

In one possible implementation manner of the present application, when there is no sidelink resource for transmitting the data within the sidelink discontinuous reception-activation time, the first terminal triggers a process of selecting/reselecting the sidelink resource.

In one possible implementation manner of the present application, when there is no sidelink resource for transmitting the data within the sidelink discontinuous reception-activation time and there is no sidelink resource for retransmitting the data, the first terminal triggers a process of selecting/reselecting the sidelink resource.

In one possible implementation manner of the present application, when there is no sidelink resource for retransmitting data within the sidelink discontinuous reception-activation time, the first terminal triggers a process of selecting/reselecting the sidelink resource.

In one possible implementation manner of the present application, if the sidelink resource used for the initial transmission data is not located within the sidelink discontinuous reception-activation time, the first sidelink resource is a sidelink resource used for retransmitting data.

In one possible implementation manner of the present application, the method provided in the embodiment of the present application further includes: and if the sidelink resources used for the initial transmission data are not positioned in the discontinuous reception-activation time of the sidelink, the first terminal abandons the transmission of the data on the sidelink resources used for the initial transmission data and the second sidelink resources used for the retransmission data.

In one possible implementation manner of the present application, the method provided in the embodiment of the present application further includes: the first terminal determines the second terminal.

In one possible implementation manner of the present application, the determining, by the first terminal, the second terminal includes: the first terminal determines a second terminal from a plurality of terminals that need to receive data transmitted by the first terminal.

In a possible implementation manner, the second terminal is a terminal with the highest priority among the plurality of terminals. Or the priority of the data sent by the first terminal to the second terminal is higher than the priority of the data sent by the first terminal to the plurality of terminals except the second terminal.

In one possible implementation manner of the present application, the determining, by the first terminal, the second terminal includes: the first terminal determines a first sidelink resource from the one or more sidelink resources. The first terminal determines a second terminal according to the first sidelink resource.

In one possible implementation manner of the present application, the determining, by the first terminal, the second terminal according to the first sidelink resource includes: the first terminal determines a terminal with a sidelink discontinuous reception-activation time comprising the time domain position of the first sidelink resource as the second terminal.

In a second aspect, an embodiment of the present application provides a method, including: the first terminal determines a first sidelink resource for initially transmitting data. If the first terminal determines that the first sidelink resource is not within the sidelink DRX-active time of the second terminal, the first terminal abstains from transmitting data to the second terminal on the second sidelink resource for retransmitting the data.

The foregoing in the embodiments of the present application, which refers to discarding transmitting data to a second terminal on a second sidelink resource used for retransmitting the data, may also be understood as not using a sidelink grant, which refers to not transmitting data (e.g., PSCCH and/or PSCCH) on the second sidelink resource indicated by the sidelink grant.

The first grant is an initial transmission grant, for example, the sidelink resource determined by the first grant is used for initial transmission of data. The second grant is a retransmission grant. The sidelink resources indicated by the second grant are used for retransmitting data. The second grant corresponding to the first grant is a grant for transmitting the same MAC PDU/transport block as the initial transmission grant.

In one possible implementation manner of the present application, the determining, by the first terminal, the first sidelink resource for initially transmitting the data may include: the first terminal determines a first authorization for initially transmitting data, and the first terminal determines a sidelink resource indicated by the first authorization as a first sidelink resource for initially transmitting data.

In one possible implementation manner of the present application, the method provided in the embodiment of the present application may further include: the first terminal determines second sidelink resources.

In one possible implementation manner of the present application, the determining, by the first terminal, the second sidelink resource includes: the first terminal determines a second authorization corresponding to the first authorization. And the first terminal determines the sidelink resources indicated by the second authorization as second sidelink resources.

In one possible implementation manner of the present application, the method for a first terminal to give up sending data to a second terminal on a second sidelink resource for retransmitting the data includes: and if the second side link resource is not positioned in the DRX-activation time of the second terminal, the first terminal abandons the data transmission to the second terminal on the side link resource indicated by the second authorization corresponding to the first authorization.

In one possible implementation manner of the present application, the method provided in the embodiment of the present application may further include: and the first terminal determines that the second sidelink resource is positioned in the DRX-activated time of the second terminal, and the first terminal sends data to the second terminal on the second sidelink resource for retransmitting the data.

In a possible implementation manner of the present application, the second terminal is any one of the multiple pieces of data to be transmitted, or the second terminal is a terminal with the highest priority among the multiple pieces of data to be transmitted.

In a third aspect, an embodiment of the present application provides a method, including: the first terminal determines a first sidelink resource for initially transmitting data. If the first terminal determines that the first sidelink resource is not within the sidelink DRX-active time of the second terminal, the first terminal transmits data to the second terminal on a second sidelink resource for retransmitting the data.

In one possible implementation manner of the present application, a method for a first terminal to transmit data to a second terminal on a second sidelink resource for retransmitting the data includes: the first terminal sends data to the second terminal on the second sidelink resource if the second sidelink resource is within the DRX-active time of the second terminal.

In a possible implementation manner of the present application, the second terminal is any one of a plurality of terminals that need to receive data sent by the first terminal, or the second terminal is a terminal with the highest priority among the plurality of terminals that need to receive data sent by the first terminal.

In a fourth aspect, an embodiment of the present application provides a method, including: if no sidelink resource for retransmitting data exists in the sidelink discontinuous receiving-activating time of the second terminal and/or the sidelink resource for initially transmitting data, the first terminal triggers the process of selecting/reselecting the sidelink resource.

It should be noted that, the technical solutions described in the first to fourth aspects may be used in combination or separately, and this is not limited in the embodiments of the present application.

In a fifth aspect, the present application provides a computer-readable storage medium, in which a computer program or an instruction is stored, and when the computer program or the instruction runs on a computer, the computer is caused to execute a communication method as described in any one of the possible implementation manners of the first aspect to the first aspect. The computer may be the first terminal.

In a sixth aspect, embodiments of the present application provide a computer-readable storage medium, in which a computer program or instructions are stored, and when the computer program or instructions are run on a computer, the computer is caused to execute a communication method as described in any one of the possible implementation manners of the second aspect to the second aspect. The computer may be the first terminal.

In a seventh aspect, an embodiment of the present application provides a computer-readable storage medium, where a computer program or an instruction is stored, and when the computer program or the instruction runs on a computer, the computer is caused to execute a communication method as described in any one of the possible implementation manners of the third aspect to the third aspect. The computer may be the first terminal.

In an eighth aspect, embodiments of the present application provide a computer-readable storage medium, in which a computer program or instructions are stored, and when the computer program or instructions are run on a computer, the computer is caused to execute a communication method as described in any one of the possible implementation manners of the fourth aspect to the fourth aspect. The computer may be the first terminal.

In a ninth aspect, embodiments of the present application provide a computer program product comprising instructions that, when executed on a computer, cause the computer to perform the method of communication described in the first aspect or in the various possible implementations of the first aspect.

In a tenth aspect, embodiments of the present application provide a computer program product comprising instructions that, when executed on a computer, cause the computer to perform the second aspect or one of the communication methods described in the various possible implementations of the second aspect.

In an eleventh aspect, embodiments of the present application provide a computer program product comprising instructions that, when executed on a computer, cause the computer to perform a communication method described in the third aspect or in various possible implementations of the third aspect.

In a twelfth aspect, embodiments of the present application provide a computer program product comprising instructions that, when executed on a computer, cause the computer to perform a communication method described in the fourth aspect or the various possible implementations of the fourth aspect.

In a thirteenth aspect, embodiments of the present application provide a communication apparatus for implementing various methods in various possible designs of any one of the first to the first aspects. The communication device may be the first terminal, or a device including the first terminal, or a component (e.g., a chip) applied in the first terminal. The communication device comprises modules and units corresponding to the implementation of the method, and the modules and units can be implemented by hardware, software or hardware to execute corresponding software. The hardware or software includes one or more modules or units corresponding to the above functions.

In a fourteenth aspect, embodiments of the present application provide a communication device for implementing various methods in various possible designs of any one of the second to the second aspects. The communication device may be the first terminal, or a device including the first terminal, or a component (e.g., a chip) applied in the first terminal. The communication device comprises modules and units corresponding to the implementation of the method, and the modules and units can be implemented by hardware, software or hardware to execute corresponding software. The hardware or software includes one or more modules or units corresponding to the above functions.

In a fifteenth aspect, embodiments of the present application provide a communications apparatus for implementing various methods in various possible designs of any one of the third to third aspects. The communication device may be the first terminal, or a device including the first terminal, or a component (e.g., a chip) applied in the first terminal. The communication device comprises modules and units corresponding to the implementation of the method, and the modules and units can be implemented by hardware, software or hardware to execute corresponding software. The hardware or software includes one or more modules or units corresponding to the above functions.

In a sixteenth aspect, embodiments of the present application provide a communications apparatus for implementing various methods in various possible designs of any one of the third to third aspects. The communication device may be the first terminal, or a device including the first terminal, or a component (e.g., a chip) applied in the first terminal. The communication device comprises modules and units corresponding to the implementation of the method, and the modules and units can be implemented by hardware, software or hardware to execute corresponding software. The hardware or software includes one or more modules or units corresponding to the above functions.

In a seventeenth aspect, an embodiment of the present application provides a communication apparatus, including: a transceiver and at least one processor. Wherein at least one processor is in communication with the transceiver, the at least one processor executing computer executable instructions or programs stored in the memory when the communication device is run to cause the communication device to perform the method of any of the various possible designs of the first aspect or any of the first aspects as described above. For example, the communication device may be the first terminal or a chip applied in the first terminal.

In an eighteenth aspect, an embodiment of the present application provides a communication apparatus, including: a transceiver and at least one processor. Wherein at least one processor and the transceiver are coupled, the at least one processor executing computer executable instructions or programs stored in the memory when the communication device is operating to cause the communication device to perform a method as set forth in any one of the various possible designs of the second aspect or the second aspect. For example, the communication device may be the first terminal or a chip applied in the first terminal.

In a nineteenth aspect, an embodiment of the present application provides a communication apparatus, including: a transceiver and at least one processor. Wherein at least one processor and the transceiver are coupled, the at least one processor executing computer executable instructions or programs stored in the memory when the communication device is operating to cause the communication device to perform a method as set forth in any one of the various possible designs of the third aspect or the third aspect. For example, the communication device may be the first terminal or a chip applied in the first terminal.

In a twentieth aspect, an embodiment of the present application provides a communication apparatus, including: a transceiver and at least one processor. Wherein at least one processor and the transceiver are coupled, the at least one processor executing computer executable instructions or programs stored in the memory when the communication apparatus is operated to cause the communication apparatus to perform a method as set forth in any one of the various possible designs of the fourth aspect or the fourth aspect. For example, the communication device may be the first terminal or a chip applied in the first terminal.

In one possible implementation manner, the communication apparatus described in the seventeenth aspect and the eighteenth aspect may further include: a memory. Wherein the memory is used for storing computer execution instructions or programs.

The memory described in any of the seventeenth aspect to the twentieth aspect may be replaced with a storage medium, which is not limited in this application.

In a possible implementation, the memory described in any of the seventeenth and eighteenth aspects may be a memory internal to the communication device, but of course, the memory may also be external to the communication device, but at least one processor may still execute the computer-executable instructions or programs stored in the memory.

In a twenty-first aspect, an embodiment of the present application provides a communication apparatus, where the communication apparatus includes one or more modules, configured to implement the method of any one of the first, second, third, and fourth aspects, where the one or more modules may correspond to respective steps in the method of any one of the first, second, third, and fourth aspects.

In a twenty-second aspect, embodiments of the present application provide a chip including a processor, and the processor is configured to read and execute a computer program stored in a memory to perform the method in the first aspect and any possible implementation manner thereof.

In a twenty-third aspect, the present application provides a chip including a processor, and the processor is configured to read and execute a computer program stored in a memory to perform the method in the second aspect and any possible implementation manner thereof.

In a twenty-fourth aspect, the present application provides a chip, where the chip includes a processor, and the processor is configured to read and execute a computer program stored in a memory, so as to execute the method in the third aspect and any possible implementation manner thereof.

In a twenty-fifth aspect, the present application provides a chip, which includes a processor, and the processor is configured to read and execute a computer program stored in a memory to perform the method in the fourth aspect and any possible implementation manner thereof.

Alternatively, the chip may be a single chip, or a chip module composed of a plurality of chips.

Optionally, the chip system further comprises a memory, and the memory and the processor are connected with the memory through a circuit or a wire.

Further optionally, the chip system further comprises a communication interface. The communication interface is used for communicating with other modules outside the chip.

In a twenty-sixth aspect, an embodiment of the present application provides a communication system, including: a first terminal and a second terminal. Wherein the first terminal is configured to perform the method of the first aspect and any possible implementation manner thereof, and the second terminal is configured to receive data from the first terminal on a first sidelink resource located within a sidelink discontinuous reception-activation time of the second terminal.

Any one of the above-provided apparatuses, or computer-readable storage media, or computer program products, or chips, or communication systems is configured to execute the corresponding methods provided above, and therefore, the beneficial effects that can be achieved by the apparatuses can refer to the beneficial effects of the corresponding schemes in the corresponding methods provided above, which are not described herein again.

Drawings

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

fig. 2 is a schematic structural diagram of a communication device according to an embodiment of the present application;

fig. 3 is a schematic diagram of a DRX cycle of a terminal on a Uu port according to an embodiment of the present disclosure;

fig. 4 is a schematic diagram of a DRX cycle of another terminal on a Uu port according to an embodiment of the present disclosure;

fig. 5 is a flowchart illustrating a communication method according to an embodiment of the present application;

fig. 6 is a schematic diagram of a relationship between a time domain position of a sidelink resource and a DRX cycle of a second terminal according to an embodiment of the present disclosure;

fig. 7 is a schematic diagram of internal interaction of a first terminal according to an embodiment of the present application;

fig. 8 is a schematic diagram that a time n when a MAC entity triggers a physical layer aware sidelink resource is before an activation time according to an embodiment of the present application;

fig. 9 is a schematic diagram of a time n when a MAC entity triggers a physical layer aware sidelink resource according to an embodiment of the present application being located within an activation time;

fig. 10 is a schematic diagram of another example where a time n when a MAC entity triggers a physical layer aware sidelink resource is within an activation time according to the present application;

fig. 11 to fig. 12 are schematic diagrams illustrating a relationship between time n and activation time when a MAC entity triggers a physical layer to sense sidelink resource according to an embodiment of the present application;

FIG. 13 is a schematic diagram of a relationship between a resource selection window and an activation time provided in an embodiment of the present application;

FIG. 14 is a schematic diagram of another activation time provided by an embodiment of the present application;

fig. 15 is a schematic diagram of selecting sidelink resources according to an embodiment of the present disclosure;

fig. 16 is a schematic diagram of another alternative sidelink resource selection provided in the embodiment of the present application;

fig. 17 is a schematic diagram of an initial transmission resource located in an activation time according to an embodiment of the present application;

fig. 18 is a schematic diagram of an initial transmission resource located outside the activation time and a retransmission resource located inside the activation time according to an embodiment of the present application;

fig. 19 is a schematic diagram of an initial transmission resource located within an activation time and a retransmission resource located outside the activation time according to an embodiment of the present application;

fig. 20 is a schematic diagram of another initial transmission resource located outside the activation time and a retransmission resource located inside the activation time according to the embodiment of the present application;

fig. 21 is a schematic structural diagram of a communication device according to an embodiment of the present application;

fig. 22 is a schematic structural diagram of a chip according to an embodiment of the present application.

Detailed Description

Currently, two terminals can directly perform data transmission on a sidelink without relaying through a base station. Taking two terminals as a terminal a and a terminal B as an example, before the terminal a sends data to the terminal B on the sidelink, the terminal a may sense the sidelink resource and then select one sidelink resource from the sensed sidelink resources. Terminal a then transmits data to terminal B on the sidelink resource over the sidelink. At present, in order to reduce the power consumption of the terminal B, the terminal B may be configured with a DRX mechanism, that is, the terminal B is in an active state for a period of time and may receive data, and is in a dormant state for another period of time, and when the terminal B is in the dormant state, the terminal B may not receive data sent to the terminal B by other terminals. Therefore, if the time range indicated by the sidelink resource selected by the terminal a is within the time period when the terminal B is in the dormant state, if the terminal a transmits data to the terminal B on the selected sidelink resource, the terminal B may not correctly receive the data, thereby causing a failure in transmission of the data transmitted from the terminal a to the terminal B, and wasting power consumption brought by the terminal a in transmitting the data.

Based on this, the present application provides a communication method, in which a first terminal first determines one or more sidelink resources. The first terminal then transmits data to the second terminal on a first sidelink resource of the one or more sidelink resources. The first sidelink resource is located in the discontinuous reception-activation time of the second terminal, and the second terminal is in an activated state at the discontinuous reception-activation time of the second terminal. Therefore, when the first terminal sends data on the first side uplink resource, the second terminal is in a state of being capable of receiving the data, data transmission failure can be avoided, and power consumption caused by the fact that the first terminal sends the data can be avoided being wasted.

In the embodiments of the present application, terms such as "first" and "second" are used to distinguish the same or similar items having substantially the same function and action. For example, the first terminal and the second terminal are only used for distinguishing different terminals, and the sequence order thereof is not limited. Those skilled in the art will appreciate that the terms "first," "second," etc. do not denote any order or quantity, nor do the terms "first," "second," etc. denote any order or importance.

It is noted that, in the present application, words such as "exemplary" or "for example" are used to mean exemplary, illustrative, or descriptive. Any embodiment or design described herein as "exemplary" or "e.g.," is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, use of the word "exemplary" or "such as" is intended to present concepts related in a concrete fashion.

In the present application, "at least one" means one or more, "a plurality" means two or more. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone, wherein A and B can be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of the singular or plural items. For example, at least one (one) of a, b, or c, may represent: a, b, c, a-b, a-c, b-c, or a-b-c, wherein a, b, c may be single or multiple.

The technical scheme of the application can be applied to various communication systems, such as: a Long Term Evolution (LTE) system, an LTE Frequency Division Duplex (FDD) system, an LTE Time Division Duplex (TDD) system, a Universal Mobile Telecommunications System (UMTS), a universal microwave access (WiMAX) communication system, a Public Land Mobile Network (PLMN) system, a device-to-device (D2D) network system or a machine-to-machine (M2M) network system, and a fifth generation mobile communications technology (the 5th generation, 5G) system, and the like.

The network architecture and the service scenario described in the embodiment of the present application are for more clearly illustrating the technical solution of the embodiment of the present application, and do not form a limitation on the technical solution provided in the embodiment of the present application, and as a person of ordinary skill in the art knows that along with the evolution of the network architecture and the appearance of a new service scenario, the technical solution provided in the embodiment of the present application is also applicable to similar technical problems.

Before describing the embodiments of the present application, first, terms related to the embodiments of the present application are described:

1) sidelink (SL) means: defined for terminals and direct communication between terminals. I.e. a link between the terminal and the terminal that communicates directly without relaying through the base station.

2) The sidelink resource refers to: terminal 1 transmits the resources used by sidelink information with terminal 2 on the sidelink.

3) The sidelink information is: sidelink data or control information, which may also be referred to as packets or V2X traffic, transmitted by any two terminals on the sidelink.

4) Discontinuous Reception (DRX), refers to a terminal turning on a receiver only for a necessary time to enter an active state (which may also be referred to as an active state) to receive data and signaling. And at other times turning off the receiver into a sleep state (which may also be referred to as an inactive state). When the terminal is in a dormant state, the terminal stops receiving data and signaling. DRX is an operation mode of the terminal that saves power consumption of the terminal. DRX is divided into idle DRX and connected DRX. Idle DRX is implemented by sensing the paging channel since there is no RRC connection and no terminal-specific bearer. Taking the DRX mechanism as an example of the DRX mechanism on Uu, connected DRX refers to DRX characteristics when a terminal is in an RRC connected state, and is implemented by monitoring a Physical Downlink Control Channel (PDCCH).

Typical application scenarios for DRX include the following categories: the method is insensitive to time delay, and services such as browsing web pages, emails and FTP which need to receive and send data are not available at most times. A service that generates rare packets, such as a Presence service. Periodic continuous packet traffic, such as voip (voice over ip) traffic, Automatic Neighbor Relation (ANR) measurement.

Taking the DRX mechanism as the DRX mechanism on Uu as an example, the terminal monitors the PDCCH within the active time, including the time when DRX-onDurationTimer runs at the beginning of one DRX cycle defined in the standard, and is in the active state (which may also be referred to as an awake state or an active state) at the active time.

Taking the DRX mechanism as the DRX mechanism on Uu as an example, the terminal may not monitor the PDCCH during the inactive time (also referred to as a sleep period), and the terminal may be in the inactive state (also referred to as a sleep state or an inactive state) during the inactive time.

5) The active state, taking the DRX mechanism as the DRX mechanism on Uu as an example, refers to a state in which the terminal can monitor the service data/PDCCH, i.e., a state when receiving the data/PDCCH, which is a variable concept. The terminal needs to detect the PDCCH in the active state.

6) And the dormant state, taking the DRX mechanism as the DRX mechanism on Uu as an example, means that the terminal cannot monitor the service data/PDCCH, and the terminal does not perform PDCCH detection in the dormant state to save electric quantity.

Device-to-Device (D2D) communication based on cellular network, also called Proximity Service (ProSe) in 3GPP, is a technology for directly communicating between terminals under the control of network, which can increase the spectrum efficiency of cellular communication system, reduce the transmission power of terminals, and solve the problem of shortage of spectrum resources of wireless communication system to some extent.

ProSe Direct Communication (Direct Communication) Communication between two or more ProSe UEs in close proximity is Direct without passing through any network node.

ProSe Direct Communication is implemented by sidelink Communication (sidelink Communication) access layer functionality. sidelink communication refers to direct communication between two or more terminals in the vicinity, without passing through any network node. ProSe Direct Communication is implemented by establishing a Direct link between two terminals over a PC5 interface.

sidelink communication uses E-UTRA or NR techniques. NR sidelink communication refers to sidelink communication using NR technology, enabling access layer functionality for V2X communication. NR sidelink Communication may also enable ProSe Direct Communication, including 5G ProSe Direct Communication.

V2X communication using Uu and/or PC5 reference points/interfaces to support communication for V2X services. V2X services are implemented through various types of V2X applications, such as Vehicle-to-Vehicle (V2V), Vehicle-to-Pedestrian (V2P), Vehicle-to-Infrastructure (V2I), and Vehicle-to-Network (V2N). V2X communication is implemented by sidelink communication access layer functionality.

In order to improve the safety and intelligence of the traffic system, the system concept of intelligent traffic is gradually created. In the near phase, the development of intelligent transportation systems will mainly focus on the field of intelligent road transportation systems, namely the vehicle to electric (V2X). V2X communication includes Vehicle to Vehicle (V2V) communication, Vehicle to roadside Infrastructure (V2I) communication, and Vehicle to pedestrian (V2P) communication. The application of V2X will improve driving safety, reduce congestion and vehicle energy consumption and improve traffic efficiency. Such as communications with traffic lights, school districts, and railroad crossings. The vehicle networking system is a sidelink transmission technology based on Long Term Evolution (LTE) V2V or new air interface V2V, and is different from a traditional LTE system or a mode in which communication data in NR is received or transmitted through network equipment, and the vehicle networking system adopts a mode of direct terminal-to-terminal communication.

As shown in fig. 1, fig. 1 shows a communication system to which the embodiment of the present application relates to a communication method, the system including: terminal 100 and terminal 200. Wherein the terminal 100 and the terminal 200 are capable of data transmission using sidelink resources on a sidelink therebetween.

Optionally, the system may further include a network device 300. The terminal 100 and the network device 300 communicate through a Uu interface. The network device 300 may allocate sidelink resources for sidelink transmissions to the terminal 100.

The terminal 200 is a terminal performing sidelink communication with the terminal 100. The terminal 200 may be regarded as a receiving side terminal (Rx UE) and the terminal 100 as a transmitting side terminal (Tx UE).

Among them, the terminal 100 and the terminal 200 have a first interface for direct communication therebetween, which may be referred to as a PC5 interface. The transmission link over the PC5 interface for terminal 100 and terminal 200 communications may be referred to as a sidelink.

For example, the PC5 interface may use a dedicated frequency band (e.g., 5.9 GHz).

The terminal 100 and the terminal 200 can communicate directly with each other through the PC5 interface. Sidelink communication and/or sidelink discovery (discovery) is performed between the terminal 200 and the terminal 100. The terminal 200 may or may not be connected/communicate with a network device. Terminal 100 may also be in SL communication with other terminals than terminal 200, considering a scenario where the other terminals are Rx UEs and terminal 100 is Tx UEs. The terminal 100 can communicate with other terminals directly, via the PC5 interface. The sidelink communication and/or sidelink discovery is performed between the terminal 100 and other terminals. The other terminals are terminals outside the coverage of the network device 300. As to how to establish the sidelink between the terminal 100 and the terminal 200, reference may be made to the description in the prior art, and details are not described herein.

sidelink transmissions are made between a pair of source (source) and destination (destination) devices. The source may be identified by a source layer 2 ID. destination can be identified by a destination layer-2 ID. The source layer-2ID identification refers to the sender (sender) of the data in the sidelink communication. The destination layer-2ID identifier refers to a target (target) or a receiving end of data in the sidelink communication.

Taking terminal 100 as the sender terminal and terminal 200 as the receiver terminal as an example, that is, terminal 100 refers to the source of sidelink communication (or one MAC PDU), and the receiver terminal refers to the destination of sidelink communication (or one MAC PDU).

The PC 5-Radio Resource Control (RRC) connection is a logical connection between two terminals corresponding to one source and destination pair. After the PC5 unicast link (PC5 unicast link) is established, the corresponding PC5 RRC connection is established. There is a one-to-one correspondence between the PC5-RRC connection and the PC5 unicast link. The PC5-RRC connection may be used for the sender terminal to transmit the capabilities and/or sidelink configuration of the sender terminal, e.g., a SL-Data Radio Bearer (DRB) configuration, to the receiver terminal in a PC5-RRC procedure.

The terminal 10 or the terminal 20, which is a device having a wireless communication function, may be deployed on land, including indoors or outdoors, hand-held, or in a vehicle. And can also be deployed on the water surface (such as a ship and the like). And may also be deployed in the air (e.g., airplanes, balloons, satellites, etc.). A terminal, also referred to as User Equipment (UE), a Mobile Station (MS), a Mobile Terminal (MT), a terminal device, and the like, is a device for providing voice and/or data connectivity to a user. For example, the terminal includes a handheld device, a vehicle-mounted device, and the like having a wireless connection function. Currently, the terminal may be: mobile phone (mobile phone), tablet computer, notebook computer, palm computer, Mobile Internet Device (MID), wearable device (e.g. smart watch, smart bracelet, pedometer, etc.), vehicle-mounted device (e.g. car, bicycle, electric car, airplane, ship, train, high-speed rail, etc.), Virtual Reality (VR) device, Augmented Reality (AR) device, wireless terminal in industrial control (industrial control), smart home device (e.g. refrigerator, television, air conditioner, electric meter, etc.), smart robot, workshop device, wireless terminal in self drive (driving), wireless terminal in remote surgery (remote medical supply), wireless terminal in smart grid (smart grid), wireless terminal in transportation safety (transportation safety), wireless terminal in smart city (city), or a wireless terminal in a smart home (smart home), a flying device (e.g., a smart robot, a hot air balloon, a drone, an airplane), etc. In a possible application scenario, the terminal is a terminal which often works on the ground, such as an in-vehicle device. In the present application, for convenience of description, a Chip disposed in the device, such as a System-On-a-Chip (SOC), a baseband Chip, or other chips having a communication function, may also be referred to as a terminal.

The terminal can be a vehicle with a corresponding communication function, or a vehicle-mounted communication device, or other embedded communication devices, or can be a user handheld communication device, including a mobile phone, a tablet computer, and the like.

As an example, in the embodiment of the present application, the terminal may also be a wearable device. Wearable equipment can also be called wearable intelligent equipment, is the general term of applying wearable technique to carry out intelligent design, develop the equipment that can dress to daily wearing, like glasses, gloves, wrist-watch, dress and shoes etc.. A wearable device is a portable device that is worn directly on the body or integrated into the clothing or accessories of the user. The wearable device is not only a hardware device, but also realizes powerful functions through software support, data interaction and cloud interaction. The generalized wearable smart device includes full functionality, large size, and can implement full or partial functionality without relying on a smart phone, such as: smart watches or smart glasses and the like, and only focus on a certain type of application functions, and need to be used in cooperation with other devices such as smart phones, such as various smart bracelets for physical sign monitoring, smart jewelry and the like.

When the various schemes described in the embodiments of the present application are applied to a V2X scene, the following fields may be applicable: unmanned driving (unmanned driving), automatic driving (automatic driving/ADS), assisted driving (driver assistance/ADAS), Intelligent driving (Intelligent driving), internet driving (connected driving), Intelligent internet driving (Intelligent network driving), and vehicle sharing (car sharing). Of course, various schemes described in the embodiments of the present application may also be applied to interaction between a bracelet and a mobile phone, and between VR glasses and a mobile phone.

The terminal 100 and the terminal 200 may communicate on a sidelink between the terminal 100 and the terminal 200 through a resource. In the embodiment of the present application, a scenario in which the terminal 100 and the terminal 200 communicate on the sidelink may be referred to as: in the sildelink communication scenario, as an example, in the embodiment of the present application, a resource used by the terminal 100 and the terminal 200 for communication on the Sidelink may be referred to as: the sidelink resource, the specific name of the resource is not limited in this application embodiment, and may be set as required.

Sidelink resources are needed for communication between terminals on the sidelink. Taking the example that the terminal 100 transmits data to the terminal 200 using the sidelink resource, the terminal 100 may currently acquire the sidelink resource in the following manner.

Mode 1(mode1), resource allocation pattern scheduled by the base station, that is, the sidelink resource of the terminal 100 is received by the terminal 100 from the base station. For example, the base station transmits a sidelink grant (SL grant) to the terminal 100. The SL grant includes information such as sidelink resource allocation, and the terminal 100 can transmit on the SL using the sidelink resource indicated/allocated by the SL grant. The SL grant contains/indicates/schedules time-frequency resources for transmitting a Physical Sidelink Control Channel (PSCCH) and/or a Physical sidelink shared channel (PSCCH). For example, a SL grant may include information for at least one sidelink resource.

mode 1: when the terminal 100 performs data transmission with a network device in a Radio Resource Control (RRC) connected state, the network device communicating with the terminal 100 may schedule a sidelink resource for transmitting sidelink service data for the terminal 100. For example, the terminal 100 transmits a Scheduling Request (SR) and a sidelink Buffer Status Report (BSR) to the network device. The sidelink BSR is configured to determine the sidelink communication data volume size of the terminal 100. Based on the sidelink BSR, the network device may determine the size of the sidelink communication data amount of the terminal 100, and schedule, for the terminal 100, the sidelink resource required for transmitting the sidelink service data. The network device uses the configured side link radio network temporary identity (SL-RNTI) to schedule side link resources for sidelink communication.

In mode1, a Physical Downlink Control Channel (PDCCH) may be used to schedule the terminal transmission on the SL. Downlink Control Information (DCI) on the PDCCH includes a SL grant. In mode1, dynamic grant is supported, and a grant type (configured grant type)1 and a configured grant type 2 are configured. A dynamic grant means that the SL grant is dynamically received on the PDCCH by the terminal. The configured grant type 1 and the configured grant type 2 refer to that the base station configures the configured grant configuration for the terminal semi-statically through RRC signaling. The base station may configure a plurality of SL configured grant configurations (SL-configured grantconfigurs) for the terminal. For example, the base station configures the SL configured grant configuration list for the terminal. The SL configured grant configuration list includes SL configured grant configurations that can be released or added or modified. Each SL configured grant configuration corresponds to an index, which may be included in the SL configured grant configuration. The SL configured grant configuration includes SL configured grant period indication information. For the configured grant type 1, time domain resource location information, frequency domain resource location information, etc. of the SL grant are included in the configured grant configuration. This facilitates the terminal to determine the time domain position and the frequency domain position of the SL grant. Wherein the SL configured grant period indication information is used to indicate the period of the SL grant.

For configured grant type 2, a configured SL grant is activated/deactivated by DCI transmitted on PDCCH, and the DCI includes configured grant configuration index information, time domain resource location information of the SL grant, frequency domain resource location information, and the like.

It should be noted that, for the configured grant type 2, when the base station determines that the terminal needs to use the configured SL grant, the terminal may use the configured SL grant after activation through DCI activation,

Mode 2(mode2), resource selection mode autonomously selected by the terminal. In other words, the SL grant is selected autonomously by the terminal. The SL grant contains information such as resource allocation, and the terminal can transmit on the SL using the sidelink resource indicated/allocated by the SL grant. The SL grant contains/indicates/schedules time-frequency resources for transmitting a Physical Sidelink Control Channel (PSCCH) and/or a physical sidelink shared channel (PSCCH).

mode2, terminal 100 selects a sidelink resource from a pool of resources, typically including one or more sidelink resources. That is, the terminal 100 selects a SL grant from one or more SL grants, and determines sidelink resources according to the selected SL grant.

For example, the resource pool is a resource broadcasted by the network device in the system information when the terminal 100 is in the network coverage. The resource pool is a pre-configured resource for the terminal 100 when the terminal 100 is out of network coverage. The resource pool may be a specific resource pool for the terminal 100, i.e. only the terminal 100 may select sidelink resources in the resource pool. Or the resource pool may be a resource pool shared by a plurality of terminals including the terminal 100, that is, the other terminals except the terminal 100 may also select resources in the resource pool. For the latter, then when the terminal 100 autonomously selects a resource in the resource pool, the terminal 10 may perform listening to the resource pool to select sidelink resources.

sidelink transmissions are based on resource pools. A resource pool is a logical concept, and a resource pool includes a plurality of physical resources, any one of which is used for transmitting data. When a terminal performs data transmission, it may use a resource from the resource pool to perform transmission.

Specifically, in order to ensure the quality of sidelink resources used by sidelink service data sent by the terminal 100, when the terminal 100 autonomously selects sidelink resources, resource collision caused by multiple terminals randomly selecting sidelink resources in a resource pool is avoided, that is, the resources selected by the terminal 100 are prevented from being occupied by other multiple terminals, so as to reduce communication quality. The terminal 100 may predict the occupation of the sidelink resource in a certain time period 1 in the future by listening, and use the occupation of the sidelink resource in the certain time period 1 as a listening result. The occupancy of so-called sidelink resources may include: whether other terminals occupy sidelink resources in the future time period 1, and/or the received power or the received strength of signals transmitted by other terminals occupying sidelink resources in the future time period 1. Therefore, based on the listening result, the terminal 100 may select or reserve sidelink resources in the time period 1, and ensure the communication quality of itself. In addition, the terminal 100 is time-efficient by listening to the reserved sidelink resources, for example, in 5G NR, the listening result of the periodic traffic and the listening result of the aperiodic traffic are different in time efficiency, and both are within a certain millisecond time.

In LTE or NR based V2X communication, the terminal 100 may use or obtain the listening result based on the listening procedure defined in the LTE Release (Release)14 standard protocol. Illustratively, the listening result of the sidelink resource may be used to indicate any one or more of: an identity or location of a particular sidelink resource in the resource pool, a signal strength on the sidelink resource, a signal power on the sidelink resource, and a Channel Busy Ratio (CBR) of the sidelink resource.

For mode2, for each sidelink process (process), after the logical channel has data, a resource selection/reselection check is triggered. If the check result is to trigger resource selection/reselection, the MAC entity of the terminal informs the PHY layer of the terminal to provide a set of sidelink resources. The MAC entity then randomly selects one of a set of sidelink resources provided by the PHY layer. If the MAC entity selects at least one reselection, the MAC entity continues to randomly select the sidelink resources from other resources except the selected sidelink resources in a group of sidelink resources provided by the PHY layer. The side link resource with the earliest time domain in the plurality of side link resources selected by the MAC entity is an initial transmission resource, and the side link resource behind the initial transmission resource can be regarded as a retransmission resource. The transmission opportunity corresponding to the plurality of sidelink resources selected by the MAC entity is a selected SL grant. If the MAC entity chooses to create a selected SL grant for transmitting multiple MAC PDUs. The MAC entity selects one sidelink resource a among a set of sidelink resources provided by the PHY layer. The MAC entity determines a set of periodic sidelink resources based on the sidelink resource a. The transmission opportunity corresponding to the sidelink resource a and the set of periodic resources selected according to the resource a is used as the selected SL grant. One SL grant per transmission opportunity. For each SL grant, the MAC entity submits each SL grant, a Modulation and Coding Scheme (MCS), and hybrid automatic repeat request (HARQ) information associated with each SL grant to the sidelink HARQ entity.

For each SL grant, if the SL grant is used for initial transmission, the sidelink HARQ entity acquires a MAC PDU to be transmitted from a Multiplexing and aggregation (Multiplexing and aggregation) entity. If a MAC Protocol Data Unit (PDU) is obtained, the sidelink HARQ entity transmits the MAC PDU, SL grant, and sidelink transmission information to the associated sidelink process. The sidelink HARQ entity informs the sidelink process to trigger a new transmission (the new transmission refers to the triggering of transmitting a data packet, and the data packet is the first/first transmitted data packet). If the sidelink HARQ entity does not acquire the MAC PDU, the HARQ buffer of the sidelink process is flushed. If the SL grant is used for retransmission, the sidelink HARQ entity submits the SL grant to a sidelindprocess associated with the SL grant, and notifies the sidelink process to trigger a retransmission (so-called retransmission means that a data packet is transmitted by triggering, the data packet is the data packet transmitted at the c-th time, c is an integer greater than or equal to 2, and c is less than or equal to the maximum retransmission number of the terminal, or c is less than or equal to the maximum retransmission number of the sidelink HARQ process of the data packet).

sidelink process is associated with one HARQ buffer. If the sidelink HARQ entity requires a new transmission, the sidelink process stores the MAC PDU in the associated HARQ buffer, stores the SL grant, and generates a transmission. If the sidelink HARQ entity requires a retransmission, the sidelink process stores the SL grant and generates a transmission. sidelink process generates a transmission comprising: the notification physical layer generates one transmission based on the stored SL grant transmission side line control information (SCI).

The acquiring, by the sidelink HARQ entity, the MAC PDU to be transmitted from the Multiplexing and allocation entity specifically includes: the Multiplexing and assigning entity corresponds to each newly transmitted SCI, and selects a destination for the SL grant associated with the SCI according to rules. Then, the Multiplexing and allocation entity reselects the logical channel belonging to the destination. The Multiplexing and allocation entity allocates resources for the selected logical channels. A rule for selecting destination is that the destination has at least one of a Logical Channel (LCH) and a Medium Access Control (MAC) Control Element (CE) with the highest priority among all logical channels and MAC CEs that satisfy the condition. There may be one or more LCHs for each destination, each LCH having a corresponding priority (priority). MAC CEs also have corresponding priorities.

Fig. 2 shows a hardware structure diagram of a communication device provided in an embodiment of the present application. The hardware structure of the first terminal and the second terminal in the embodiment of the present application may refer to the structure shown in fig. 2. The communication device comprises a processor 21, a communication line 24 and at least one transceiver (which is only exemplary in fig. 2 to include transceiver 23).

The processor 21 may be a general-purpose Central Processing Unit (CPU), a microprocessor, an application-specific integrated circuit (ASIC), or one or more ics for controlling the execution of programs in accordance with the present invention.

The communication link 24 may include a path for transmitting information between the aforementioned components.

The transceiver 23 may be any device, such as a transceiver, for communicating with other devices or communication networks, such as an ethernet, a Radio Access Network (RAN), a Wireless Local Area Network (WLAN), etc.

Optionally, the communication device may also include a memory 22.

The memory 22 may be, but is not limited to, a read-only memory (ROM) or other type of static storage device that can store static information and instructions, a Random Access Memory (RAM) or other type of dynamic storage device that can store information and instructions, an electrically erasable programmable read-only memory (EEPROM), a compact disk read-only memory (CD-ROM) or other optical disk storage, optical disk storage (including compact disk, laser disk, optical disk, digital versatile disk, blu-ray disk, etc.), magnetic disk storage media or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer. The memory may be separate and coupled to the processor via a communication line 24. The memory 22 may also be integrated with the processor 21.

The memory 22 is used for storing computer-executable instructions for executing the scheme of the application, and is controlled by the processor 21 to execute. The processor 21 is configured to execute computer-executable instructions stored in the memory 22, so as to implement the communication method provided by the following embodiments of the present application.

Optionally, the computer-executable instructions in the embodiments of the present application may also be referred to as application program codes, which are not specifically limited in the embodiments of the present application.

In particular implementations, processor 21 may include one or more CPUs such as CPU0 and CPU1 in fig. 2, for example, as one embodiment.

In particular implementations, the communication device may include multiple processors, such as processor 21 and processor 25 in fig. 2, for example, as an example. Each of these processors may be a single-core (single-CPU) processor or a multi-core (multi-CPU) processor. A processor herein may refer to one or more devices, circuits, and/or processing cores for processing data (e.g., computer program instructions).

The following will describe the procedure for the terminal to sense and select sidelink resources to which the present application relates:

the PHY layer of the terminal is notified of the MAC entity's request to determine a set of sidelink resources in n time units (e.g., time slots). And the physical layer takes the perceived sidelink resources within the (n + T1, n + T2) as candidate sidelink resources. Wherein the candidate sidelink resources that are located within [ n + T1, n + T2] constitute a candidate resource set.

It is understood that [ n + T1, n + T2] selects a window for the terminal's resources.

Wherein T1 satisfies

The value of T1 depends on the implementation of the terminal. Wherein,

is a time slot, as defined in Table 1 below, where μ_SLIs the SCS configuration. If the minimum value of T2 is less than the remaining (remaining) Packet Delay Budget (PDB) (the unit is a slot), then the value of T2 depends on the terminal implementation, and T2min ≦ T2 ≦ P, where P represents the remaining PDB. Otherwise, T2 equals remaining PDB. The remaining PDB is provided by the MAC entity to the PHY layer.

TABLE 1

And the physical layer determines one or more side link resources from the candidate resource set according to a certain rule and reports the side link resources to the MAC entity.

As an example, taking a side uplink resource m of the one or more side uplink resources as an example, the terminal determines whether the side link resource k in the candidate resource set is excluded according to Reference Signal Receiving Power (RSRP) of a demodulation reference signal (DMRS) of the PSCCH/PSCCH received on the side uplink resource m. Where k is determined by m.

For example, if the RSRP of the DMRS of the PSCCH/PSCCH received on the sidelink resource m is greater than the threshold 1 and meets other conditions, the physical layer of the terminal determines that the sidelink resource k should be excluded. Finally, the physical layer determines that sidelink resource k is not included in the one or more sidelink resources. If the number of one or more sidelink resources finally determined by the physical layer is less than the total number of sidelink resources in the candidate resource set multiplied by M, the terminal determines whether the sidelink resource k should be excluded according to a threshold value of 2. Wherein threshold 2 is greater than threshold 1. For example, the threshold 2 is the threshold 1 plus a preset value. For example, the preset value is 3 dB.

Currently, when a terminal communicates with a network device, in order to save unnecessary power consumption of the terminal and reduce the monitoring time of the terminal, the terminal may apply a discontinuous reception mechanism at a Uu port (interface between the terminal and the network device) to help the terminal in a Radio Resource Control (RRC) connection state to save energy. The basic principle of DRX is: when a terminal communicates with a network device, the network device may have data to transmit for a period of time, and the network device may have no data to transmit to the terminal for a subsequent longer period of time. When the network device does not send data to the terminal, it consumes much power for the terminal if the terminal still keeps the listening state. Therefore, when the terminal does not receive data, the terminal stops monitoring a Physical Downlink Control Channel (PDCCH) to reduce power consumption of the terminal, thereby increasing battery life of the terminal.

In NR, a Discontinuous Reception (DRX) function is defined in order to save unnecessary power consumption when the terminal is in an RRC connected state. Terminals employing the DRX mechanism monitor the PDCCH during some time periods and not during other time periods. Accordingly, DRX reduces terminal power consumption by controlling the terminal not to monitor the PDCCH for some period of time.

In NR, the DRX mechanism configured by the network device for the terminal further includes corresponding DRX parameters, for example, in the 5G NR version, the parameters and functions of the parameters mainly included in the DRX mechanism are as follows:

a DRX on duration timer (DRX-on duration timer) the duration of the beginning of a DRX Cycle (the duration at the beginning of a DRX Cycle). At the beginning of the DRX cycle, where the duration of the on duration is the duration, the terminal may be considered to be in an active state during the DRX-on duration timer.

DRX slot offset (DRX-SlotOffset) time delay before opening DRX-onDurationTimer.

A DRX inactivity timer (DRX-inactivity timer) that continues to be in an active state for a period of time after the terminal successfully decodes a PDCCH for scheduling new data initial transmission on the Uu port, that is, after the terminal is scheduled, the DRX-inactivity timer should be turned on to prolong the time when the terminal is in the active state, and a corresponding scenario may be understood that the terminal is currently scheduled and is likely to continue to be scheduled in a next period of time, so the terminal needs to remain in the active state to wait for receiving data.

DRX long cycle on offset (DRX-LongCycleStartOffset): indicating a Long DRX Cycle (Long DRX Cycle) and a DRX on offset (DRX-StartOffset). Wherein, Long DRX Cycle designates the number of sub-frames/millisecond occupied by the Long DRX period, and DRX-StartOffset designates the starting sub-frames of the Long DRX period and the short DRX period.

DRX downlink retransmission timer (DRX-retransmission timerdl) (for each HARQ process except the broadcast process): and the terminal waits for receiving the downlink retransmission data from the network equipment in the drx-retransmission timerDL operation for the maximum duration before receiving the downlink retransmission data of the Uu port.

DRX uplink retransmission timer (DRX-retransmission timer ul) (for each uplink HARQ process): the terminal retransmits uplink data in the drx-retransmission timer UL operation for the maximum duration (the maximum duration for UL retransmission is received) before receiving the uplink retransmission resource of the Uu port.

DRX short cycle (DRX-ShortCycle) (optional): i.e., the time length of the Short DRX cycle (Short DRX cycle), in units of subframes/ms.

DRX downlink HARQ round trip timer (DRX-HARQ-roundtrip-TimerDL, DRX-HARQ-RTT-TimerDL) (for each downlink HARQ process except for the broadcast process): the duration before the terminal expects to receive the downlink HARQ retransmission data on the Uu port can be understood as a time window, the base station does not perform downlink retransmission for the data packet with current transmission failure in the time window, and the terminal can continue to receive the downlink retransmission data of the data packet only after waiting for the time out of the drx-HARQ-RTT-TimerDL. When drx-HARQ-RTT-TimerDL of the terminal is over, the terminal can start to receive downlink retransmission data, and then drx-retransmission TimerDL is started. I.e. the minimum duration before a downlink assignment for HARQ retransmission may occur.

DRX uplink HARQ round trip timer (DRX-HARQ-RTT-timerll) (for each uplink HARQ process): the duration before the terminal expects to receive the uplink HARQ retransmission resource on the Uu port can be understood as a time window, the terminal cannot perform uplink retransmission on the data packet which fails to be currently transmitted in the time window, and the terminal can continue to upload the data of the data packet only after waiting for the timeout of the drx-HARQ-RTT-timerll. When drx-HARQ-RTT-timerll of the terminal expires, the terminal may start uplink retransmission, and then open drx-retransmission timerll, that is, the minimum duration before an uplink HARQ retransmission grant may occur.

Therefore, when the terminal configures the DRX mechanism, the terminal being in DRX-active time (active time) mainly includes the following cases:

case 1, any one timer (timer) of drx-onDurationTimer or drx-InactivetyTimer or drx-retransmission TimerDL or drx-retransmission TimeUL or random Access ContentionResolutionTimer is in a running state. The ra-ContentionResolutionTimer refers to a timer used by the terminal in the random access process, and is used for the terminal to wait for obtaining the access resource of the base station.

In case 2, the terminal has sent a Scheduling Request (SR) on a Physical Uplink Control Channel (PUCCH), and the SR is currently in a pending state, and the pending may be understood as terminal preparation but the SR is not yet sent to the network device.

Case 3, similar to the ra-ContentionResolutionTimer, the terminal successfully receives a Random Access Response (RAR) for responding to a preamble sequence (preamble) of a contention-based random access selected by the non-terminal, but does not receive a PDCCH indicating an initial transmission (using a cell radio network temporary identifier (C-RNTI)).

Accordingly, in any one or more of the three cases, the terminal needs to detect the PDCCH, where detecting the PDCCH includes detecting a PDCCH corresponding to a Radio Network Temporary Identifier (RNTI) as follows: cell-RNTI (C-RNTI), configuration scheduling-RNTI (CS-RNTI), interrupt-RNTI (INT-RNTI), slot format identifier RNTI (slot format indicator-RNTI, SFI-RNTI), semi-persistent channel state information RNTI (SP-CSI-RNTI), PUCCH-transmission power control RNTI (TPC-PUCCH-RNTI), PUSCH transmission power control RNTI (transmit power-PUSCH-RNTI), and sounding reference signal transmission power control RNTI (SRS-power-signaling-signal RNTI).

In the above, the PDCCH corresponding to the RNTI may refer to a Cyclic Redundancy Check (CRC) bit that scrambles DCI carried by the PDCCH with the RNTI.

It should be noted that, the activation time may also include other situations specified in future communication protocols besides the above situations, and this is not specifically limited in the embodiment of the present application.

After various timers described in the embodiments of the present application are started, the timers are in a running state until the timers are stopped or overtime; otherwise, the timer is not in a running state. If the timer is not running, the timer may be started. After the timer is stopped or overtime, the timer is not in a running state until the timer is started. If the timer is in the running state, the timer may be restarted. The length of time of the timer may be understood as the length of time the timer runs continuously from the start or restart until the time-out. The value of the timer is its initial value at start-up or restart. The initial value of the timer may be the length of time of the timer. The value of the timer is the length of time of the timer at start-up or restart.

The names of the timers in the embodiments are just examples. The DRX parameters/timers in the following are all DRX parameters/timers on SL.

When the DRX cycle is configured or the DRX is configured, the activation time includes: the time that drx-onDurationTimer or drx-InactivetyTimer or drx-RecransmissionTimerDL or drx-RecransmissionTimeUL is running. In active Time, the terminal needs to monitor the PDCCH. In addition to active Time, the terminal does not need to monitor the PDCCH, and thus the terminal may not monitor the PDCCH.

As shown in fig. 3, the On Duration (On Duration) is periodically repeated, and the DRX cycle is a period in which the On Duration is repeated. The drx-onDurationTimer is started at the start of the on-duration, which is the duration of the on-duration, i.e. the on-duration is the run-time of the drx-onDurationTimer. A DRX Opportunity (Opportunity for DRX) is a period of inactivity that belongs to the sleep period if no other timer that leads to a DRX active time is running.

The time at which the Drx-onDurationTimer starts is determined from Drx-StartOffset and Drx-SlotOffset. Specifically, a subframe for starting drx-onDurationTimer is determined from drx-StartOffset, and is started after drx-SlotOffset from the start of the subframe.

As shown in fig. 4, if the terminal receives a PDCCH indicating a new transmission for an on duration, a drx-inactivity timer is started or restarted at the first symbol after the PDCCH reception is ended. The activation time of the terminal is determined by the start time of the on-duration and the end time of the drx-inactivity timer, as shown in fig. 4. That is, the start time of the activation time of the terminal is the start time of the on-duration, and the end time of the activation time of the terminal is the end time of the drx-inactivytytimer.

If the terminal receives a MAC PDU in the configured downlink allocation, the first symbol after the transmission of the downlink HARQ feedback is finished starts the drx-HARQ-RTT-TimerDL of the corresponding HARQ process, and stops the drx-retransmission TimerDL of the corresponding HARQ process. If a PDCCH indicating downlink transmission is received, starting drx-HARQ-RTT-TimerDL of the corresponding HARQ process at the first symbol after the transmission of the downlink HARQ feedback is finished, and stopping drx-retransmission TimerDL of the corresponding HARQ process. If the drx-HARQ-RTT-TimerDL is overtime, if the data of the corresponding HARQ process is not decoded successfully, starting drx-retransmission TimerDL of the corresponding HARQ process at the first symbol after the drx-HARQ-RTT-TimerDL is overtime.

When the sidelink communication is performed between the current sender terminal (Tx UE) and the receiver terminal (Rx UE), specifically considered scenarios include, but are not limited to, V2X communication, device-to-device (D2D), public safety (public safety), business communication (business), and other sidelink-related communication scenarios, where, when the Rx UE does not use the DRX mechanism, the Rx UE continuously monitors PSCCH transmitted by the Tx UE for the entire period of time, and the Rx UE continuously maintains an active state and can receive scheduling data transmitted by the Tx UE. However, the Tx UE does not always transmit data to the receiving terminal, and therefore, if the Rx UE continuously monitors the PSCCH transmitted by the Tx UE for the entire time period, power consumption of the Rx UE is necessarily wasted.

Based on the above description, DRX was introduced in sidelink as discussed in 3GPP Release 17. The SL DRX timer may refer to a DRX timer on Uu. For example, drx-onDurationTimer, drx-InactivetyTimer, drx-HARQ-RTT-TimeSL, and drx-retransmission TimerSL are also used for SL. In order to distinguish from the various timers on the Uu port, in the embodiment of the present application, the various timers used on the SL may be distinguished by adding the SL to the nomenclature. For example, the drx-onDurationTimer employed on SL may be named: drx-onDurationTimer-SL. The drx-inactivytytytimer used on SL may be named: drx-InactivityTimer-SL.

The SL DRX-active time includes a time during which a DRX-on duration timer-SL (DRX on duration timer-SL), a DRX-inactivity timer-SL (DRX inactive timer-SL), or a DRX-retransmission timer-SL (DRX retransmission timer-SL) is running. The receiving terminal (Rx UE) monitors/receives PSCCH, PSSCH, SCI or MAC PDU within the SL DRX-active time. One possible way is that each source and destination pair corresponds to a single SL DRX-active time. Each source and destination pair corresponds to a set of SL DRX timers.

The DRX-ondurationtimer-SL is used for indicating the Duration of the beginning of the sidelink DRX cycle, namely the "On Duration" of the DRX cycle, namely the "On Duration" indicates a time period, and is determined by DRX-onDurationTimerPC5, the length of the DRX-ondurationtimer-SL is equal to the size of the DRX-ondurationtimer-SL, at the beginning of the sidelink DRX cycle, the terminal starts DRX-ondurationtimer-SL, namely enters the "On Duration", and the DRX-onduration-SL starts to run, namely enters the sidelink DRX activation time;

drx-InactivatyTimer-SL (also referred to as drx-InactivatyTimePC 5) for indicating a duration of time after transmission of a PSCCH, PSSCH, SCI or MAC PDU, wherein the SCI includes a first-level SCI, a second-level SCI, or a first-level SCI and a second-level SCI, the first-level SCI may be carried on the PSCCH, the second-level SCI may be carried on the PSSCH, the PSSCH transmission may be a new transmission, and accordingly, the PSCCH or SCI may be used to schedule the new transmission, or the PSSCH transmission may be a new transmission or a retransmission, and the PSCCH or SCI may be used to schedule the new transmission or the retransmission. For example, if the terminal device receives PSCCH or SCI indication to perform new data transmission On the side during the side chain DRX active time, the terminal device may start or restart DRX-inactivity timer PC5, so that the terminal is always in the side chain DRX active time, which may be understood as the time length of "On Duration" of the time length that the terminal device originally is in the side chain DRX active state, run DRX-inactivity timer PC5 may extend the time that the terminal device is in the side chain DRX active state until DRX-inactivity timer PC5 times out, or the terminal device receives related MAC CE signaling to stop DRX-On Duration timer PC5 and DRX-inactivity timer PC5, for example, DRX Command PC5 MAC CE, and then the terminal ends the side chain DRX active time to enter the DRX side chain inactive time, that is, the terminal enters the DRX side chain inactive state from the side chain active state;

drx-retransmission timer-SL (also referred to as: drx-retransmission timer pc5) for indicating a maximum duration before the SCI of a received or scheduled sidelink HARQ retransmission, wherein different sidelink processes may correspond to different drx-retransmission timer pcs 5;

drx-HARQ-RTT-Timer-SL, also referred to as drx-HARQ-RTT-TimerPC5, is used to indicate the minimum duration before the SCI where a sidelink HARQ retransmission is expected or scheduled, where different sidelink processes may correspond to different drx-HARQ-RTT-TimerPC 5.

The names of the timers used in the SL are not limited in the embodiments of the present application. The above names are merely one example.

Since the mode2 resource selection mechanism in the prior art does not consider the SL DRX, the sender terminal is the destination of the SL grant selected according to the above rule. However, the time domain position of the sidelink resource corresponding/indicated/allocated to the SL grant may not be within the SL DRX-active time of destination. If the terminal sends PSCCH, PSSCH, SCI or MAC PDU to the destination at the sidelink resource corresponding to/indicated/allocated by the SL grant, and the destination does not monitor/receive PSCCH, PSSCH, SCI or MAC PDU, the transmission of PSCCH, PSSCH, SCI or MAC PDU fails, and Tx UE wastes power consumption. How to avoid packet transmission failure and avoid Tx UE wasting power is solved by the scheme described in fig. 5 below based on the embodiments of this application.

In the embodiment of the present application, a specific structure of an execution subject of one communication method is not particularly limited as long as communication can be performed by one communication method according to the embodiment of the present application by running a program in which a code of one communication method of the embodiment of the present application is recorded. For example, an execution main body of a communication method provided by the embodiment of the present application may be a functional module capable of calling a program and executing the program in the first terminal, or a communication device applied in the first terminal, such as a chip, a system-on-chip, an integrated circuit, and the like. The chip, the chip system, and the integrated circuit may be disposed inside the first terminal, or may be independent from the first terminal, which is not limited in the embodiments of the present application.

As shown in fig. 5, fig. 5 illustrates a communication method provided in an embodiment of the present application, where the method includes:

step 501, the first terminal determines one or more sidelink resources.

The one or more sidelink resources may be used to transmit data that the first terminal transmits to the second terminal, i.e., the first terminal may transmit data to the second terminal on a resource of the one or more sidelink resources. Wherein, the one or more sidelink resources include a sidelink resource located at a sidelink discontinuous reception-activation time of the second terminal. The second terminal is in an active state during a sidelink discontinuous reception-active time of the second terminal.

As described above, the sidelink drx-activation time of the second terminal includes: a time of a run period of any one or more of a drx-onDuratTimer-SL, drx-InactivetyTimer-SL, or drx-RecransmissionTimer-SL of the second terminal. For example, when one or more of the drx-inactivity timer-SL or drx-retransmission timer-SL of the second terminal is not running, the sidelink drx-activation time of the second terminal at least includes the drx-onDurationTimer-SL running period. The active state of the second terminal is maintained when any one or more of the drx-inactivity timer-SL or drx-retransmission timer-SL of the second terminal is started, and the sidelink drx-discontinuous reception-active time of the second terminal is determined by the operating duration of the drx-on duration timer-SL and any one or more of the drx-inactivity timer-SL or drx-retransmission timer-SL.

The first terminal and the second terminal in the embodiment of the application can use the sidelink resources to perform data transmission on the sidelink that the first terminal and the second terminal have.

In an embodiment of the present application, the one or more sidelink resources may be resources dedicated to transmit specific data, or the one or more sidelink resources may be resources for transmitting any data, which is not limited in this application.

In an embodiment of the present application, the one or more sidelink resources may be obtained by the first terminal through sensing (also referred to as listening) from a resource pool. For example, the first terminal may need to transmit data, and the first terminal may perform a sensing technique in the resource pool to determine one or more sidelink resources.

In one embodiment of the present application, the one or more sidelink resources may be idle resources, that is, resources that are not used or reserved by other terminals except the second terminal. The one or more sidelink resources may also be non-idle resources, i.e. resources used or reserved by other terminals than the second terminal. Alternatively, the second terminal may be aware that the signal received power or signal strength on the one or more sidelink resources is expected to be low, even if other terminals except the second terminal transmit data on the one or more sidelink resources, the signal received power or signal strength measured by the second terminal is low.

In one embodiment of the present application, the one or more sidelink resources may be sidelink resources that are available for transmitting data and suggested or scheduled by other terminals than the second terminal to the first terminal. Since other terminals except the second terminal may not know the time when the second terminal is in the active state and the dormant state, the sidelink resources that may be suggested or scheduled include sidelink resources whose time ranges are within the sidelink discontinuous reception-active time of the second terminal.

In an embodiment of the present application, the one or more sidelink resources may be sidelink resources that are allocated by a base station accessed by the first terminal for the first terminal and are available for transmitting data. I.e., the one or more sidelink resources may be sidelink resources acquired by the first terminal in the manner 1 described above.

The second terminal in the embodiment of the present application adopts a DRX mechanism. The second terminal is in an active state during a sidelink discontinuous reception-active time. When the second terminal is in an active state, that is, when the second terminal is in the sidelink discontinuous reception-active time, the second terminal monitors/receives the PSCCH, SCI, or MAC PDU, that is, may receive data from other terminals.

The time of the second terminal except the sidelink discontinuous reception-activation time is discontinuous reception-deactivation time, which can also be called as: sidelink discontinuous reception-dormant period.

The second terminal is in an inactive state at the sidelink discontinuous reception-inactive time, which may also be referred to as a sleep state. The second terminal may not listen/receive the PSCCH, SCI, or MAC PDU when the second terminal is in a sleep state, i.e., the second terminal is not within the sidelink discontinuous reception-activation time. When the second terminal is in the discontinuous reception-deactivation time of the sidelink, the second terminal may also monitor/receive the PSCCH, SCI, or MAC PDU, which is not limited in this embodiment of the present application.

For example, the data transmitted by the first terminal to the second terminal may be one or more of PSCCH, SCI, or MAC PDU that the first terminal transmits to the second terminal on the sidelink. Wherein the SCI includes a first-level SCI, or the SCI includes a first-level SCI and a second-level SCI. The PSCCH is used to indicate a time-frequency domain resource location, a modulation and coding scheme, a priority of data carried in a side-link data channel (PSCCH), and the like of PSCCH transmission, and the PSCCH is used to carry data.

In this embodiment, when the second terminal performs an uplink communication scenario on the PC5 interface, the discontinuous reception mechanism adopted may be referred to as: a sidelink connectionless reception mechanism (SL DRX).

In the embodiment of the present application, the SL DRX of the terminal may be understood as the SL DRX when the terminal is used as a receiving terminal, or may be understood as the SL DRX between the terminal and the receiving terminal when the terminal is used as a sending terminal, or the SL DRX between a pair of source and destination. Wherein, the source is a sender terminal identified by source layer-2ID, the destination is a receiver terminal identified by destination layer-2ID, or the source is a sender terminal identified by source layer-1ID, and the destination is a receiver terminal identified by destination layer-1 ID.

The terminal device on the receiving side monitors or receives PSCCH, psch, SCI, or MAC PDU while being in the SL DRX active state, that is, during the SL DRX active period.

The second terminal can also be understood as a destination, a terminal identified by a destination layer-2ID or a destination layer-1 ID. The first terminal may also be understood as a source, a terminal identified by a source layer-2ID or a source layer-1 ID.

Step 502, the first terminal sends data to the second terminal on a first sidelink resource of the one or more sidelink resources. Accordingly, the second terminal receives data from the first terminal on the first sidelink resource. The first sidelink resource is located within a sidelink discontinuous reception-activation time of the second terminal.

In this embodiment of the present application, that the first sidelink resource is located within the sidelink discontinuous reception-activation time of the second terminal may mean that the time domain position of the first sidelink resource is located within the sidelink discontinuous reception-activation time, that is, the first sidelink resource is located within the sidelink discontinuous reception-activation time from the starting position to the ending position. Alternatively, the partial time domain position of the first sidelink resource is located within the sidelink discontinuous reception-activation time. For example, the first sidelink resource is located within the sidelink DRX-activated time from the starting location to a certain intermediate location, and the remaining time domain location is not within the sidelink DRX-activated time.

For example, as shown in fig. 6, taking the drx-onDurationTimer-SL operation period of the second terminal as including time slot 1 and time slot 2 as an example, the one or more sidelink resources include sidelink resource 1, sidelink resource 2 and sidelink resource 3. Where sidelink resource 1 is located in slot 1.

Sidelink resources

2 and 3 are located in time slot 4 and time slot 5, respectively. Since sidelink resource 1 is located within the sidelink DRX-active time, the first terminal may determine that sidelink resource 1 is the first sidelink resource.

As an example, when the number of sidelink resources located within the sidelink drx-activation time of the second terminal is plural, the first terminal may determine the first sidelink resource according to the priority of the plural sidelink resources. For example, the side link resource with the highest priority in the plurality of side link resources located in the discontinuous reception-activation time of the side link is determined as the first side link resource. Of course, the first terminal may also randomly select one sidelink resource from a plurality of sidelink resources located within the sidelink discontinuous reception-activation time to determine as the first sidelink resource. The embodiment of the present application does not limit this.

The embodiment of the application provides a communication method, wherein a first terminal firstly determines one or more side link resources. The first terminal then transmits data to the second terminal on a first sidelink resource of the one or more sidelink resources. The first sidelink resource is positioned in the sidelink discontinuous receiving-activating time of the second terminal, and the second terminal is in the activating state in the sidelink discontinuous receiving-activating time of the second terminal, so that the second terminal can be in the state of receiving data when the first terminal sends data on the first sidelink resource, and the data transmission failure can be avoided, and the power consumption caused by the data sending of the first terminal can be avoided.

In an embodiment of the present application, before step 502, the method provided in the embodiment of the present application may further include: the first terminal determines a sidelink discontinuous reception-activation time of the second terminal.

Determining the sidelink discontinuous reception-activation time of the second terminal with respect to the first terminal may be accomplished by:

in the method 1, the first terminal acquires the discontinuous reception-activation time of the sidelink of the second terminal from the second terminal.

The method comprises the steps that the first terminal acquires the discontinuous reception-activation time of the side link of the second terminal from the second terminal and comprises active acquisition and passive acquisition. So-called active acquisition refers to: the first terminal firstly sends a first request message to the second terminal, wherein the first request message is used for requesting the side-link discontinuous reception-activation time of the second terminal. And then the second terminal sends DRX configuration information of the second terminal to the first terminal, wherein the DRX configuration information comprises information used for determining the sidelink discontinuous reception-activation time of the second terminal. For example, the information for determining the sidelink DRX-activation time of the second terminal is the DRX related parameter of the second terminal, such as DRX cycle, DRX-on duration timer-SL duration, DRX-inactive timer-SL duration, DRX-retransmission timer-SL duration, and DRX start offset, so that the first terminal can determine the sidelink DRX-activation time of the second terminal according to the DRX related parameter.

So-called passive acquisition refers to: the first terminal may not transmit the first request message to the second terminal, but the second terminal actively transmits DRX configuration information of the second terminal to the first terminal. For example, before the second terminal determines that it needs to receive the data of the first terminal, the DRX configuration information of the second terminal may be sent to the first terminal.

Mode2, the first terminal acquires the sidelink discontinuous reception-activation time of the second terminal from the communication equipment configuring the DRX mechanism for the second terminal.

For example, the communication device may be a base station or a terminal configured with a DRX mechanism, which is not limited in this embodiment of the present application.

The acquisition of the sidelink drx-activation time of the second terminal from the communication device by the first terminal in mode2 can also be divided into active acquisition and passive acquisition. For a specific implementation manner, reference may be made to the manner in which the first terminal obtains the sidelink drx-activate time of the second terminal from the second terminal, which is not described herein again.

In order to ensure that the first terminal can select, from the one or more sidelink resources, a sidelink resource located at a sidelink discontinuous reception-activation time of the second terminal, and ensure reliability of data transmission from the first terminal to the second terminal, in the embodiment of the present application, the number of sidelink resources located in the first time period in the one or more sidelink resources is greater than or equal to a first threshold. The starting time of the first time period is the starting time corresponding to the candidate resource set, or the starting time of the first time period is the starting time of the discontinuous reception-activation time of the sidelink or the starting time later than the discontinuous reception-activation time of the sidelink. The expiration time of the first time period is the end time of the sidelink discontinuous reception-activation time.

In one embodiment of the present application, the first threshold may be a value predefined by the protocol, for example, the first threshold is a fixed value such as 2, 3, 4, 5, etc.

In one embodiment of the present application, the first threshold is determined according to a total number of candidate sidelink resources in the first time period, for example, the first threshold is the total number of candidate sidelink resources in the first time period multiplied by M. Wherein M is greater than 0 and less than or equal to 1. The M may be determined by the first terminal itself, or predefined by a protocol, or configured by the network device, or preconfigured, which is not limited in this embodiment of the application. For example, the first time period is [ T1+ n, T3], and the first threshold is determined by multiplying M by the total number of candidate sidelink resources in [ T1+ n, T3] of the candidate resource set. The M may be determined by the first terminal itself, or predefined by a protocol, or configured by the network device, or preconfigured, which is not limited in this embodiment of the application. Wherein n represents the time when the MAC entity of the first terminal notifies the physical layer to sense the sidelink resources, that is, the PHY layer of the first terminal receives the MAC entity request to determine one or more sidelink resources in the time slot n. T3 denotes an end time of the discontinuous reception-activation time. T1+ n represents the starting time corresponding to the candidate resource set.

The candidate resource set in the embodiment of the present application includes s candidate sidelink resources, where s is an integer greater than or equal to 1. How the first terminal determines the candidate resource set will be described below.

For example, the first terminal determines s candidate sidelink resources from the sidelink resources as the candidate resource set according to the resource selection window of the first terminal. Then the starting time corresponding to the candidate resource set is the starting time of the resource selection window of the first terminal. Correspondingly, the starting time of the sidelink resource with the earliest time domain position in the candidate resource set is later than or equal to the starting time of the resource selection window. The ending time corresponding to the candidate resource set is the ending time of the resource selection window of the first terminal (e.g., T2+ n), that is, the ending time of the sidelink resource with the latest time domain position in the candidate resource set should be earlier than or equal to T2+ n.

For example, with [ T1+ n, T2+ n ] as the resource selection window for the first terminal, the first terminal may determine s sidelink resources located in [ T1+ n, T2+ n ] as candidate sidelink resources. T2+ n indicates that the end time of the resource selection window, i.e., the end time of the sidelink resource with the latest time domain position in the candidate resource set, should be earlier than or equal to T2+ n. The s sidelink resources include all sidelink resources in [ T1+ n, T2+ n ], and one sidelink resource is a resource of one frequency unit in one time slot. Alternatively, the s sidelink resources include a portion of sidelink resources in [ T1+ n, T2+ n ], e.g., resources of certain frequency cells in certain time slots. The frequency unit may be L consecutive subchannels, L being an integer greater than or equal to 1.

The conditions satisfied by T1 and T2 may refer to the descriptions in table 1 above, or may be the conditions described below, and are not described herein again.

As a specific implementation, step 501 in this embodiment may be implemented by: the first terminal takes all sidelink resources within a resource selection window (e.g., [ T1+ n, T2+ n ]) as a candidate resource set. The first terminal then determines one or more sidelink resources from the set of candidate resources. In particular, a candidate set of resources is determined by a physical layer of the first terminal and one or more sidelink resources are determined from the candidate set of resources.

In one embodiment of the present application, when T2+ n is greater than or equal to T3, i.e., the deadline for the set of candidate resources is later than or equal to the end time of the sidelink discontinuous reception-activation time, the number of sidelink resources located within the first time period of the one or more sidelink resources is greater than or equal to a first threshold.

For example, 10 sidelink resources are included in the candidate resource set, and the total number of sidelink resources located in [ T1+ n, T3] in the 10 sidelink resources is 6, and M is 0.5, then the number of sidelink resources located in [ T1+ n, T3] in the one or more sidelink resources should be greater than or equal to 3.

In one possible embodiment of the present application, one or more sidelink resources are sidelink resources determined from a candidate resource set, and a starting time of the candidate resource set is later than or equal to a starting time of the sidelink discontinuous reception-activation time, or is expressed as: the starting time of the sidelink discontinuous reception-activation time is earlier than or equal to the starting time corresponding to the candidate resource set. In the scheme, in order to ensure that the sidelink resources located at the sidelink discontinuous reception-activation time exist in the candidate resource set, so as to ensure that the sidelink resources located at the sidelink discontinuous reception-activation time exist in one or more sidelink resources determined from the candidate resource set subsequently, the first terminal may update the starting time corresponding to the candidate resource set.

For example, the first terminal sets a starting time corresponding to the candidate resource set to be later than or equal to a starting time of the discontinuous reception-activation time. Since the starting time corresponding to the candidate resource set is determined by T1+ n, the first terminal may adjust the condition satisfied by T1 to start from

Become into

Wherein T4 is less than

If T4 is greater than or equal to

T1 ═ T4-n. Where T4 denotes a start time of the discontinuous reception-activation time.

In one possible embodiment of the present application, the cutoff time corresponding to the candidate resource set is earlier than or equal to the end time of the sidelink drx-activation time. This ensures that the sidelink resources in the candidate resource set are earlier than or equal to the end time of the sidelink DRX-activation time.

It is worth noting that the candidate resource set satisfies one or more of the following conditions: i.e., the start time is later than or equal to the start time of the sidelink drx-activation time, or the deadline is earlier than or equal to the end time of the sidelink drx-activation time.

When the starting time corresponding to the candidate resource set is later than or equal to the starting time of the sidelink discontinuous reception-activation time, and the ending time corresponding to the candidate resource set is earlier than or equal to the ending time of the sidelink discontinuous reception-activation time, it can be ensured that the sidelink resources in the candidate resource set are all located in the sidelink discontinuous reception-activation time.

As an example, the first terminal determines the starting time of the resource selection window according to the starting time of the discontinuous reception-activation time of the first terminal. And then the first terminal determines s candidate side link resources in the resource selection window from the side link resources as a candidate resource set according to the starting time and the ending time of the resource selection window. The end time of the resource selection window is determined by T2+ n.

In one embodiment of the present application, the one or more sidelink resources are sidelink resources determined from a set of candidate resources. The deadline time corresponding to the candidate resource set is earlier than or equal to the retransmission ending time of the data. This may ensure that there are sidelink resources in the candidate resource set for retransmitting the data. For example, a possible retransmission end time may be determined according to at least one of the number of retransmissions, an RTT timer (timer) duration, a retransmission timer duration, and an end time of the discontinuous reception-activation time. Wherein, the RTT Timer can be drx-HARQ-RTT-Timer-SL. The retransmission timer may be drx-retransmission timer-SL.

For example, the first terminal sets the deadline corresponding to the candidate resource set to be earlier than or equal to the retransmission ending time of the data. Since the deadline corresponding to the candidate resource set is determined by T2+ n, the first terminal may adjust the condition satisfied by T2 from T2min ≦ T2 ≦ P to T2min ≦ T2 ≦ retransmission end time-n or T2min ≦ T2 ≦ min (retransmission end time-n, P), where T2min < retransmission end time-n. If T2min is greater than or equal to the retransmission end time-n, T2 ═ retransmission end time-n, or T2 ═ the minimum of (retransmission end time-n, P).

Describing the conditions satisfied by one or more sidelink resources and the conditions satisfied by the start time and the end time corresponding to the candidate resource set, the following will describe how a Physical (PHY) layer and a Medium Access Control (MAC) layer in the first terminal interact to determine one or more sidelink resources.

In one embodiment of the application, the first terminal has a physical layer and a MAC entity. Accordingly, as shown in fig. 7, step 501 in the embodiment of the present application may be implemented by:

step 701, the physical layer of the first terminal determines one or more sidelink resources from the candidate resource set.

In a possible embodiment of the present application, the method provided in this embodiment of the present application may further include, before step 701: and the media access control entity of the first terminal sends a perception notice to the physical layer, wherein the perception notice is used for informing the physical layer of perceiving the sidelink resources. The sending of the awareness notification to the physical layer by the medium access control entity of the first terminal may also be understood as the MAC entity requesting the physical layer to determine one or more sidelink resources. And the physical layer perceives the side link resources according to the perception notice. The physical layer may determine candidate sidelink resources from the sidelink resources. In the embodiment of the application, the physical layer may immediately perceive the sidelink resource after receiving the perception notification, may perceive the sidelink resource after a preset time, and may already perceive the sidelink resource before receiving the perception notification. The preset time may be determined by the first terminal, or the protocol is predefined, which is not limited in this embodiment of the application.

For example, the mac entity of the first terminal sends the awareness notification to the physical layer of the first terminal in time unit 1. For example, time cell 1 is n as described above.

In one possible embodiment of the present application, the physical layer may actively sense sidelink resources. Such as when the physical layer determines that data needs to be transmitted, then the cognitive sidelink resources may be determined.

The following describes, as an example, whether to provide the first information to the physical layer when the mac entity notifies the physical layer of sensing the sidelink resource:

example 1), a media access control entity provides first information to a physical layer.

In example 1), as a possible embodiment of the present application, the method provided in this embodiment of the present application may further include, before step 701: and the media access control entity of the first terminal sends the first information to the physical layer of the first terminal. Accordingly, the physical layer of the first terminal receives the first information from the medium access control entity of the first terminal.

Wherein the first information is used for determining an end time of a sidelink discontinuous reception-activation time of the second terminal.

As an example, the first information is one or more of information indicating an end time of the sidelink discontinuous reception-activation time or information indicating a remaining time of the sidelink discontinuous reception-activation time.

As an example, the first information and the perception notification may be carried in the same message and sent to the PHY layer. For example, the first information and the perceptual notification are both carried in the message 1, so that the first information and the perceptual notification are simultaneously sent to the PHY layer.

As another example, the first information and the perception notification may also be carried in different messages and sent to the PHY layer, which is not limited in this embodiment. For example, the MAC entity first notifies the PHY layer of the sensing of the sidelink resource and then provides the PHY layer with the first information. Of course, the MAC entity may also provide the first information to the PHY layer before notifying the PHY of the aware sidelink resources.

For example, the information indicating the end time of the sidelink DRX-activated time may be the expiration time of the sidelink DRX-activated time or the time length L. Providing the time length L facilitates the physical layer determining an end time of the sidelink discontinuous reception-activation time according to a current time (e.g., time unit 1) and the time length L. The current time may be understood as a time when the physical layer receives the time length L, and a time when the media access control entity sends the time length L to the physical layer may be considered as a time when the physical layer receives the time length L, and errors in receiving and sending between the two may be ignored.

For example, the information indicating the remaining time of the sidelink drx-activation time may be: the remaining time, or, alternatively, the cutoff time for the sidelink discontinuous reception-activation time. By providing the expiration of the sidelink DRX-active time, this facilitates the PHY layer selecting a sidelink resource from the set of candidate resources that is prior to the expiration of the sidelink DRX-active time.

For example, the MAC entity requires the physical layer to determine a set of sidelink resources in n time slots. For example, the MAC entity provides time Q to the physical layer, where Q is the remaining time of the sidelink drx-activation time, and n + Q is the end time of the sidelink drx-activation time. It is worth noting that the remaining time of the sidelink drx-activation time can be understood as the remaining time of the sidelink drx-activation time determined at the current time. Further, the time is a continuous discontinuous reception-activation time.

For example, the first terminal may derive a periodic DRX-onDurationTimer-SL operation time according to a DRX cycle (cycle), a DRX start offset, and a DRX-onDurationTimer-SL duration of the second terminal.

As shown in fig. 8, at the time slot n, the second terminal is in the sleep period, that is, the second terminal is not in the sidelink drx-activated period, but the drx-onDurationTimer-SL of the second terminal is operated in the time periods T4 to T3 and T5 to T6, so that the second terminal is in the activated state in the time periods T4 to T3 and T5 to T6 and is in the sidelink drx-activated period, specifically, the drx-activated period. At n slots, the MAC entity provides T3 or T3-n to the physical layer. Wherein, T3, T6 represent the end time of the sidelink drx-activation time, and T3-n represent the remaining time of the sidelink drx-activation time. In the embodiment shown in fig. 8, the sidelink drx-active time is the drx-active period.

As shown in fig. 9, in the time slot n, the drx-onDurationTimer-SL of the second terminal is running, i.e., the time when the MAC entity provides T3 or T3-n to the physical layer is within the sidelink drx-activation time of the second terminal, and the MAC entity of the first terminal provides time T3 or T3-n to the physical layer in the time slot n.

As shown in fig. 10, at the time slot n, DRX on duration timer-SL (DRX on duration timer-SL) of the second terminal is running and DRX inactive timer-SL (DRX inactivity timer-SL) is also running, and the period 1 is the running time determined by DRX-inactivity timer-SL at the time slot n. If drx-InactivetyTimer-SL does not restart after time slot n, drx-InactivetyTimer-SL times out after T3. The discontinuous reception-activation time of the second terminal ends at T3. In slot n, the MAC entity provides time T3 or T3-n to the physical layer.

As also shown in fig. 11, at time slot n, drx-onDurationTimer-SL is running and drx-inactivytimeter-SL is also running, and time period 2 is the running time determined at time slot n for drx-inactivytimeter-SL. It may be determined that drx retransmission timer SL will operate within the dashed box at time slot n. The first terminal may determine at time slot n that the second terminal is not within the discontinuous reception-activation time after T3. In slot n, the MAC entity provides time T3 or T3-n to the physical layer.

In one embodiment of the present application, when the MAC entity determines that physical layer aware sidelink resources are needed, the MAC entity provides one or more of information indicating an end time of a sidelink discontinuous reception-activation time or information indicating a remaining time of the sidelink discontinuous reception-activation time to the first terminal.

In another embodiment of the present application, the MAC entity may determine whether to provide the physical layer with one or more of information indicating an end time of the sidelink discontinuous reception-activation time or information indicating a remaining time of the sidelink discontinuous reception-activation time, according to a relationship between the remaining time of the sidelink discontinuous reception-activation time and the remaining PDB.

For example, when the remaining time (T3-n) of the sidelink discontinuous reception-activation time is greater than or equal to the remaining (remaining) PDB, the MAC entity does not provide the physical layer with one or more of information indicating an end time of the sidelink discontinuous reception-activation time or information indicating the remaining time of the sidelink discontinuous reception-activation time. The reason for not providing the information is that T2 is less than or equal to the remaining PDB, and therefore the end of the resource selection window is earlier than the end of the sidelink drx-activation time, and therefore, the information is not provided. The remaining PDB in this embodiment may refer to data sent by the first terminal to the second terminal on the sidelink.

For example, when the remaining time (T3-n) of the sidelink drx-activation time is less than or equal to the remaining (remaining) PDB, the MAC entity provides one or more of information indicating an end time of the sidelink drx-activation time or information indicating the remaining time of the sidelink drx-activation time to the physical layer.

This facilitates the physical layer selecting sidelink resources located within the sidelink discontinuous reception-activation time from the candidate resource set in case the media access control entity provides the physical layer with information about the sidelink discontinuous reception-activation time. The situation that the media access control entity cannot determine the first sidelink resource for transmitting data and further cannot transmit data due to the fact that the sidelink resources located within the discontinuous receiving-activating time of the sidelink are not included in one or more sidelink resources reported to the media access control entity by the physical layer is avoided.

In example 1), step 701 provided in an embodiment of the present application may be implemented by: the physical layer determines one or more sidelink resources from the candidate resource set based on the first information.

As an example, the physical layer determines one or more sidelink resources from the candidate resource set according to the first information, including: the physical layer selects the sidelink resources from the candidate resource set before the end time of the sidelink discontinuous reception-activation time to determine as one or more sidelink resources.

It is worth noting that in the embodiment of the present application, in the case that the medium access control entity provides the first information to the physical layer, the physical layer refers to the first information when selecting one or more sidelink resources from the candidate resource set, and therefore, the one or more sidelink resources include a sidelink resource located before T3 and a sidelink resource located after T3. Or all of the one or more sidelink resources may precede T3.

Further optionally, the sidelink resources included in the one or more sidelink resources are also required to be satisfied after time unit 1. This is because the physical layer determines that sidelink resources need to be perceived at time unit 1, and then providing sidelink resources located before time unit 1 to the MAC entity may not be of reference value, and thus the physical layer may not provide sidelink resources located before time unit 1 to the MAC entity of the first terminal. For example, time unit 1 may be time slot n.

In an embodiment of the present application, the one or more sidelink resources may be all sidelink resources in the candidate resource set, or a part of sidelink resources, which is not limited in this application. The one or more sidelink resources may be reported to the MAC entity by the PHY layer one by one, or the one or more sidelink resources may be reported to the MAC entity by the PHY layer in a unified manner.

The PHY layer of the first terminal is facilitated to specify the starting time of the side link discontinuous reception-activation time of the second terminal, so as to ensure that the side link resources positioned at the side link discontinuous reception-activation time exist in one or more side link resources provided by the PHY layer to the MAC entity. Then in one possible embodiment of the present application, the first information further comprises: information indicating a start time of a sidelink discontinuous reception-activation time.

As an example, the information indicating the start time of the sidelink drx-activation time may be the start time of the sidelink drx-activation time, or the information indicating the start time of the sidelink drx-activation time may be the current time + L1. Where L1 denotes the length of time from the current time to the start time of the sidelink drx-activation time.

In one possible embodiment of the present application, when the first information further includes: when the information indicating the start time of the sidelink drx-activation time is used, step 701 may be implemented by the steps of: the physical layer determines the discontinuous reception-activation time of the sidelink according to the first information. The physical layer then determines one or more sidelink resources from the candidate set of resources based on the sidelink discontinuous reception-activation time.

In one possible embodiment of the present application, the MAC entity may provide the PHY layer with one or more of information indicating a start time of the sidelink discontinuous reception-activation time and information determining an expiration time of the sidelink discontinuous reception-activation time.

In one possible embodiment of the present application, when the MAC entity determines that physical layer aware sidelink resources are needed, information indicating a start time of a sidelink discontinuous reception-activation time is provided to the PHY layer.

In one possible embodiment of the present application, the MAC entity determines whether to transmit information indicating the start time of the sidelink drx-activation time to the physical layer of the first terminal according to a relationship between time unit 1 and the start time of the sidelink drx-activation time. Time unit 1 determines the time to perceive sidelink resources for the physical layer of the first terminal.

For example, when the time unit 1 is located before the start time of the sidelink drx-activation time or the time unit 1 is the start time of the sidelink drx-activation time, the mac entity of the first terminal sends information indicating the start time of the sidelink drx-activation time to the physical layer of the first terminal. At this time, since when the time unit 1 is located before the start time of the sidelink drx-activation time, it indicates that the MAC entity notifies the PHY of perceiving the sidelink, the second terminal is still in the dormant state, and has not yet entered the active state from the dormant state, if the PHY layer of the first terminal is not provided with the start time of the sidelink drx-activation time, it may cause the one or more sidelink resources provided by the subsequent PHY layer to the MAC entity to include the sidelink resource located before the start time of the sidelink drx-activation time, but the sidelink resource located before the start time of the sidelink drx-activation time carries data that cannot be transmitted to the second terminal.

Referring to fig. 8, for example, the first terminal may obtain the periodic DRX-onDurationTimer-SL operation time according to the DRX cycle, the DRX start offset, and the DRX-onDurationTimer-SL duration. In the time slot n, the second terminal is not in the SL active time (i.e., the above-mentioned sidelink drx-activation time), but it is known that the drx-onDurationTimer-SL of the second terminal is running in the T4-T3 period and the T5-T6 period, so that the second terminal is in the sidelink drx-activation time in the T4-T3 period and the T5-T6 period. Then at slot n the MAC entity provides T4 or T4-n to the physical layer. T4-n represents the time length from slot n to the start time of the sidelink discontinuous reception-activation time.

For example, when the time unit 1 is located after the start time of the sidelink drx-activation time or the time unit 1 is the start time of the sidelink drx-activation time, the mac entity of the first terminal does not send information indicating the start time of the sidelink drx-activation time to the physical layer of the first terminal. At this time, since the time unit 1 is located after the start time of the sidelink drx-activation time, which means that the second terminal is already in an active state when the MAC entity notifies the PHY layer of sensing the sidelink, the possibility that the sidelink resources located before the time unit 1 are included in the one or more sidelink resources provided by the subsequent PHY layer to the MAC entity is relatively small.

As also shown in fig. 9, at time slot n, drx-onDurationTimer-SL is running, i.e. the second terminal is within the sidelink drx-activation time at time slot n, then at time slot n, the MAC entity provides time T4 or T4-n or 0 to the physical layer, or the MAC entity does not provide the physical layer with the start time of the sidelink drx-activation time.

Example 2), the medium access control entity provides no first information to the physical layer.

When the medium access control entity does not provide the first information to the physical layer, the physical layer selects one or more sidelink resources from the candidate resource set without considering the first information. Therefore, the sidelink resources within the sidelink discontinuous reception-activation time may exist in one or more sidelink resources reported to the MAC entity by the physical layer. There may also be one or more sidelink resources reported by the physical layer to the MAC entity that are not located within the sidelink drx-activation time.

If one or more side link resources reported by the physical layer to the MAC entity do not have side link resources located in the discontinuous reception-activation time of the side link, the MAC entity cannot select the resources located in the discontinuous reception-activation time of the side link, and the MAC entity does not select the initial transmission resources and the retransmission resources. Or, the MAC entity may notify the physical layer to report the perceived sidelink resource again, which is not limited in this embodiment of the present application.

In one embodiment of the present application, if the MAC entity requires the physical layer to determine time unit 1 of a set of sidelink resources such that n + T1 is no earlier than the start time of the sidelink discontinuous reception-activation time. Thus, the MAC entity does not provide the physical layer with the start time information of the sidelink drx-activation time. The method comprises the following specific steps:

as shown in fig. 12, taking time unit 1 as time slot n as an example, time slot n is within the drx-active time. As can be seen in fig. 12, the start time (n + T1) of the candidate resource set is located after the start time of the discontinuous reception-activation time.

As shown in fig. 13, the time slot n is later than or equal to the time slot T1 before the start of the drx-active time. For example, in fig. 13, time slot n is equal to the time slot T1 before the start of active time.

As one possible embodiment of the present application, it is described above that the PHY layer of the first terminal may determine one or more sidelink resources reported to the MAC entity from the s candidate sidelink resources. The PHY layer may refer to a rule that a number of sidelink resources within a first time period of the final one or more sidelink resources is greater than or equal to a first threshold when determining one or more sidelink resources reported to the MAC entity from the s candidate sidelink resources.

For example, if n + T2 is greater than or equal to T3 (i.e., the deadline of the candidate resource set is later than the end time of the drx-activation time), the number of sidelink resources in [ n + T1, T3] of the one or more sidelink resources reported by the physical layer to the MAC entity reaches a certain value (the first threshold). For example, the first threshold may be obtained by multiplying M by the total number of candidate sidelink resources in [ n + T1, T3] in the candidate resource set. If the physical layer determines that the number of sidelink resources located in [ n + T1, T3] of the one or more sidelink resources is less than the first threshold, the PHY layer increases the RSRP threshold to determine whether the candidate sidelink resources are excluded. The PHY layer determines one or more sidelink resources reported to the MAC entity based on the elevated RSRP threshold. The PHY layer may continually increase the RSRP threshold until the physical layer determines that resources of one or more sidelink resources in [ n + T1, T3] reach that value.

Optionally, in one or more sidelink resources reported to the MAC entity by the physical layer, it is further required to satisfy that the number of resources in [ T3+1, n + T2] is greater than or equal to the total number of candidate resources in [ T3+1, n + T2] multiplied by M, and if not, it may also be satisfied by continuously increasing the RSRP threshold. Therefore, a certain amount of resources can be ensured to be available for the MAC entity to select the sidelink resources of the initially transmitted data in the discontinuous receiving-activating time. There are a certain number of resources in the resource selection window for the MAC entity to select the sidelink resource for retransmitting the data.

Step 702, the physical layer reports information of one or more sidelink resources to a media access control entity of the first terminal.

As shown in fig. 7, step 501 in the embodiment of the present application may be implemented by the following step 703:

step 703, the mac entity selects a first sidelink resource located within the sidelink drx-activate time of the second terminal from the one or more sidelink resources.

In an embodiment of the present application, in order to ensure that there are sidelink resources for retransmitting data in the candidate resource set, a method provided in an embodiment of the present application further includes: the first terminal determines a retransmission end time of the data or a remaining retransmission time of the data. And the first terminal determines the ending time corresponding to the candidate resource set according to the retransmission ending time or the residual retransmission time, wherein the ending time corresponding to the candidate resource set is earlier than or equal to the retransmission ending time. Wherein, the condition that the deadline corresponding to the candidate resource set is earlier than or equal to the retransmission ending time may be understood as: the deadline time corresponding to the candidate resource set is located before the retransmission ending time, or is the retransmission ending time. Of course, the deadline time corresponding to the candidate resource set may also be located after the retransmission ending time, so that it may be fully ensured that the sidelink resource that may be used for retransmitting data before the retransmission ending time exists in the candidate resource set. This process may consider that the first terminal re-determines the time of the deadline corresponding to the candidate resource set.

It should be noted that the retransmission ending time and the remaining retransmission time in the embodiment of the present application are both times estimated by the first terminal in advance, and at this time, the first terminal may not transmit the data to the second terminal for the first time. The retransmission end time may also be referred to as: a possible retransmission end time or a latest retransmission end time. The retransmission end time may also be referred to as the latest retransmission time or may be referred to as the latest possible retransmission time. The remaining retransmission time may also be referred to as a possible remaining retransmission time or a maximum remaining retransmission time. The possible remaining retransmission time is the possible retransmission end time-n.

For example, the MAC entity may request the physical layer to determine a set of sidelink resources in time slot n, and the physical layer may use the resources within T1+ n, T2+ n as s candidate sidelink resources. The s candidate sidelink resources constitute a candidate resource set. The physical layer determines one or more sidelink resources reported to the MAC entity from the set of candidate resources. Wherein if T2min < retransmission end time-n, T2min is less than or equal to T2 and less than or equal to retransmission end time-n. Otherwise, T2 is the retransmission end time-n.

Or, if T2min < retransmission end time-n, T2min ≦ T2 ≦ min (retransmission end time-n, remaining PDB). If T2min is greater than or equal to the retransmission end time-n, T2min is greater than or equal to the remaining PDB, T2 ═ min (retransmission end time-n, remaining PDB). If T2min is greater than or equal to the retransmission end time-n, T2min is less than the remaining PDBs, T2 ═ retransmission end time-n, or T2 ═ min (retransmission end time-n, remaining PDBs). If T2min < retransmission end time-n, T2min is greater than or equal to the remaining PDB, T2 ═ the remaining PDB, or T2 ═ min (retransmission end time-n, remaining PDB).

Or, if T2min < min (retransmission end time-n, remaining PDB), T2min ≦ T2 ≦ min (retransmission end time-n, remaining PDB). If T2min is greater than or equal to min (retransmission end time-n, remaining PDB), T2 ═ min (retransmission end time-n, remaining PDB).

The following describes a process in which the first terminal determines a retransmission end time of data or a remaining retransmission time of data, taking an example of an interaction between the MAC entity and the physical layer of the first terminal. For example, the mac entity sends second information to the physical layer, where the second information is used to indicate a retransmission end time of the data or indicate a remaining retransmission time of the data. The determining, by the first terminal, the retransmission end time of the data or the remaining retransmission time of the data includes: and the physical layer of the first terminal determines the retransmission ending time or the residual retransmission time according to the second information.

It is noted that the second information may be transmitted to the PHY layer by the MAC entity of the first terminal at time unit 1, or transmitted to the PHY layer by the MAC entity of the first terminal after time unit 1. The second information may be sent to the PHY layer together with the first information, or sent to the PHY layer separately, which is not limited in this embodiment of the application.

As an example, the second information comprises a retransmission end time or a remaining retransmission time of the data. This avoids the PHY from calculating the retransmission end time or the remaining retransmission time of the data on its own. At this time, the MAC entity may determine a possible retransmission end time according to at least one of the retransmission times, the RTT timer duration, the retransmission timer duration, and the end time of the discontinuous reception-activation time.

As another example, the second information is at least one of a retransmission number of the data, an RTT timer duration, and a retransmission timer duration. Then the PHY layer determining the retransmission end time or the remaining retransmission time according to the second information may include: and the PHY layer of the first terminal determines the retransmission ending time or the residual retransmission time of the data according to at least one of the retransmission times of the data, the RTT timer duration and the retransmission timer duration. In the scheme, the physical layer calculates the retransmission end time or the residual retransmission time.

In one possible implementation manner of the present application, the retransmission end time is equal to the end time of the sidelink discontinuous reception-activation time + (RTT timer duration + retransmission timer duration) × the number of retransmissions. Or, the retransmission ending time is equal to the ending time of the sidelink discontinuous reception-activation time + retransmission timer duration x retransmission times. Or, the retransmission ending time is equal to the first data transmission ending time + (RTT timer duration + retransmission timer duration) × retransmission times. Or, the retransmission ending time is equal to the first data transmission ending time + the retransmission timer duration.

For example, as shown in fig. 14, the number of retransmissions is 2, T3 is the end time of the sidelink drx-active time, and T5 is the retransmission end time (or the latest retransmission end time). Then the deadline for the candidate resource set cannot exceed T5 at the latest.

In one possible embodiment of the present application, the medium access control entity provides the minimum value of the remaining packet delay budget and the retransmission end time to the physical layer, regardless of whether the remaining packet delay budget is smaller than the first value, i.e. the MAC entity does not need to consider the relation between the remaining packet delay budget and the first value.

In one possible embodiment of the present application, the MAC entity determines whether to provide the physical layer with the minimum value among the remaining packet delay budget and the retransmission end time, taking into account a relationship between the remaining packet delay budget and the first value.

For example, if the remaining packet delay budget is less than the first value or the remaining packet delay budget is less than the remaining retransmission time, the MAC entity does not physically provide a possible retransmission end time or a remaining retransmission time. The first value is the retransmission end time-n.

For example, if the remaining packet delay budget is less than the first value, or the remaining packet delay budget is less than the remaining retransmission time, the MAC entity provides the physical layer with the minimum value of the remaining PDB and the retransmission end time.

The above step 703 can be implemented by:

the MAC entity selects a first sidelink resource from one or more sidelink resources provided by a physical layer, such that the selected first sidelink resource is located within a sidelink discontinuous reception-activation time. The sidelink DRX-activated time in the embodiments of the present application may be understood to include a currently determined sidelink DRX-activated time and a possible sidelink DRX-activated time, where the possible sidelink DRX-activated time is determined according to the selected first sidelink resource. There are several specific ways:

1) the selected initial transmission resource (e.g., a first sidelink resource) is within the currently determined sidelink discontinuous reception-activation time, and if a retransmission resource (e.g., a second sidelink resource) is required, the selected retransmission resource is within the currently determined sidelink discontinuous reception-activation time or during a possible retransmission timer run. The possible retransmission timer run-time is determined from the resources preceding the resource. For example, one initial transmission resource and two retransmission resources are selected, the first retransmission timer operating period is determined according to the initial transmission resource, and the first retransmission timer operating period is determined according to the first retransmission resource. For example, one initial transmission resource and two retransmission resources are selected, the first retransmission resource can be indicated by the SCI of the initial transmission, and the second retransmission resource can be indicated by the SCI of the first retransmission resource.

At present, a terminal may determine time domain and frequency domain resources for PSCCH transmission according to a time domain resource allocation field and a frequency domain resource allocation field included in an SCI and resources for PSCCH transmission, where the time domain resource allocation field indicates N resources and a time slot offset of resources other than a first resource in the N resources, N may be 1, 2, or 3, a time slot in which the first resource is located is a time slot in which the SCI is located, the time slot offset of the resources other than the first resource is a time slot offset relative to the first resource, and the frequency domain resource allocation field indicates the number of consecutive subchannels of each of the N resources and a starting subchannel index of the resources other than the first resource. Wherein the N resources are used for N data transmissions.

Specifically, the MAC entity selects a sidelink resource from one or more sidelink resources provided by the physical layer, so that the selected initial transmission resource is within the sidelink discontinuous reception-activation time. If a retransmission resource needs to be selected, the retransmission resource can be indicated by the previous SCI, either at the currently determined sidelink DRX-active time or during possible retransmission timer operation. More specifically, the MAC entity randomly selects one of the sidelink resources located within the sidelink drx-activation time among the one or more sidelink resources provided by the physical layer as the first sidelink resource. If at least one retransmission resource needs to be selected, then the retransmission resource continues to be selected from one or more sidelink resources provided by the remaining physical layer, so that the selected initial transmission resource can be indicated by the previous SCI within the sidelink DRX-activated time, or within the currently determined sidelink DRX-activated time or possible retransmission timer running period. The earliest resource in time is the initial transmission resource. The selection of resources here may be understood as resources for selecting one transmission opportunity. The initial transmission resource can be understood as a resource of an initial transmission opportunity, and the retransmission resource can be understood as a resource of a retransmission opportunity. The resource can be understood in the operation period of the possible retransmission timer as the transmission opportunity corresponding to the resource is in the operation period of the possible retransmission timer.

The initial transmission resource in this embodiment is a resource used for transmitting the data for the first time, that is, a resource used when the data is transmitted for the first time. The retransmission resource in this embodiment is a resource used for transmitting the data for the second time, that is, a resource used when the data is transmitted for the xth time. X is greater than or equal to 2.

In this embodiment of the present application, the first terminal may determine a plurality of second sidelink resources, and the number of the second sidelink resources may be determined according to the number of times of retransmission of the data, which is not limited in this embodiment of the present application.

The possible retransmission timer run time may be determined based on the sidelink resource selected by the first terminal. For example, the starting time of the retransmission timer running time may be the first time unit after the end of resource a, where if the retransmission timer is the timer at the first retransmission, resource a is the resource for the initial transmission before the first retransmission. If the retransmission timer is the timer at the g-th retransmission, resource A is the resource for retransmission before the g-th retransmission. g is an integer greater than or equal to 2. The end time of the retransmission timer running time is the start of the retransmission timer running time + the retransmission timer duration-1. The possible retransmission timer run time may also be determined based on the selected first sidelink resource and the RTT timer. For example, the first terminal determines the running time of the RTT timer according to the selected sidelink resource, the first time unit after the RTT timer expires is the starting time of the running time of the retransmission timer, and the ending time of the running time of the retransmission timer is the starting time of the running time of the retransmission timer + the duration of the retransmission timer-1. The determining, by the first terminal, the running time of the RTT timer according to the selected sidelink resource may specifically be: and the first terminal determines the resource for carrying the transmission of the HARQ feedback according to the selected side link resource. The first time unit after the transmission carrying the HARQ feedback ends is the start time of the RTT timer running time. The end time of the RTT timer running time is the start of the RTT timer running time + RTT timer duration-1. A time unit may be a symbol, slot, subframe, millisecond, frame, minislot, etc.

As shown in fig. 15, the sidelink resources a, B, C, D represent sidelink resources selected by the MAC entity. The sidelink resource a is a sidelink resource with the earliest time domain position in the four sidelink resources, and the sidelink resource D is a sidelink resource with the latest time domain position in the four sidelink resources. Wherein, the side link resource A is the initial transmission resource. And the side link resource B to the side link resource D are retransmission resources. Wherein, the sidelink resources A and B are in the currently determined sidelink discontinuous reception-activation time. And the side link resource C is in the operation period of the retransmission timer determined according to the side link resource B, and the side link resource D is in the operation period of the retransmission timer determined according to the side link resource C.

The retransmission resource can be indicated by the previous SCI, and specifically, the retransmission resource can be indicated by a time domain resource allocation field in the previous SCI. A resource can be indicated by a preceding SCI as requiring satisfaction of the time domain location of the resource less than or equal to a threshold from the time domain location of the preceding SCI. One possible way is that the slot in which the resource is located-the slot in which the preceding SCI is located-is less than or equal to 31.

2) The selected initial transmission resource is in the currently determined SL DRX-active time, if the retransmission resource needs to be selected, the selected retransmission resource is in the currently determined discontinuous reception-activation time of the side link or in the possible discontinuous reception-activation time of the side link, and the possible discontinuous reception-activation time of the side link is determined according to the resource in front of the resource. Specifically, the MAC entity selects the sidelink resource from one or more sidelink resources provided by the physical layer, so that the selected initial transmission resource is within the sidelink discontinuous reception-activation time, and if the retransmission resource needs to be selected, the retransmission resource can be indicated by the previous SCI, or within the currently determined sidelink discontinuous reception-activation time or a possible sidelink discontinuous reception-activation time. More specifically, the MAC entity randomly selects one sidelink resource from one or more sidelink resources provided by the physical layer as an initial transmission resource within the sidelink discontinuous reception-activation time. If at least one retransmission resource needs to be selected, resources continue to be selected from the remaining sidelink resources except the initial transmission resource in one or more sidelink resources provided by the physical layer, so that the selected initial transmission resource is within the sidelink discontinuous reception-activation time, and the retransmission resource can be indicated by the previous SCI, or within the currently determined sidelink discontinuous reception-activation time or possible sidelink discontinuous reception-activation time. The earliest sidelink resource in time is the initial transmission resource. Selecting sidelink resources herein may be understood as selecting sidelink resources for a transmission opportunity. The initial transmission resource can be understood as a sidelink resource of the initial transmission opportunity, and the retransmission resource can be understood as a sidelink resource of the retransmission opportunity. The side link resource in the active time can be understood as that the transmission opportunity corresponding to the side link resource is in the side link discontinuous reception-activation time.

Possible active times include possible retransmission timer run periods in 1), and possible other timer run periods, e.g., possible drx-InactivityTimerSL run periods. The possible drx-inactivytimersl run duration is determined according to the selected initial transmission resource, e.g. drx-inactivytimersl starts/restarts at the first time unit after the initial transmission resource ends, and times out after the drx-inactivytimersl duration.

As shown in fig. 16, the sidelink resources 1 to 4 are sidelink resources selected by the MAC entity. Wherein, the sidelink resource 1 is the initial transmission resource. The sidelink resource 4 is a retransmission resource. Wherein, the

sidelink resources

1 and 2 are within the currently determined sidelink discontinuous reception-activation time. The sidelink resource 3 is located in the drx-InactivityTimerSL running period determined by the first terminal according to the sidelink resource 1. The sidelink resource 4 is located in the retransmission timer running period determined by the first terminal according to the sidelink resource 3.

Optionally, the selected sidelink resource of the one or more sidelink resources provided by the physical layer by the MAC entity further needs to satisfy that a time interval between any two selected sidelink resources is greater than or equal to a minimum time interval. Optionally, if the resource pool where the resource is located configures the PSFCH resource, the condition of the minimum time interval needs to be satisfied. For example, the time interval between the first sidelink resource and the second sidelink resource is greater than or equal to the minimum time interval.

One situation that may occur is that the MAC entity cannot select X retransmission resources that satisfy the above condition from one or more sidelink resources provided by the physical layer. Wherein, X is the retransmission times determined by the MAC entity, and X is greater than or equal to 1, then the MAC entity selects a maximum of N retransmission resources that can satisfy the above conditions, where N is greater than or equal to 0.

In one possible embodiment of the present application, if the first terminal needs to send data to multiple destinations. Wherein the destination may be a destination selected by the first terminal for one SL grant according to the LCP procedure. Specifically, there is a Logical Channel (LCH) and at least one of the MAC CEs having the highest priority destination among all the logical channels and MAC CEs that satisfy the condition. The conditions include: SL data is transmittable in the destination.

Alternatively, the destination may be the destination having the data to be transmitted. The SL DRX-active time of the destination is determined according to the active time of at least one destination of the data to be transmitted. For example, the union or intersection of active times of destination of the data to be transmitted.

In one possible embodiment of the present application, the first terminal may first determine the destination. For example, there are multiple destinations of data to be transmitted, and the first terminal may select one target destination from the destinations of the multiple data to be transmitted (the destinations of the multiple data to be transmitted may belong to the same terminal or may belong to different terminals, which is not limited in this embodiment of the present application). For example, if the destination is identified by the layer-2ID of the second terminal, the first terminal may determine that sidelink resources need to be selected to send data to the second terminal. And then the first terminal selects the side link resource positioned in the SL DRX-active time from one or more side link resources as the first side link resource according to the SL DRX-active time of the second terminal. The first terminal then transmits data to the second terminal on the first sidelink resource. For the way that the first terminal can select one target destination from the destinations of the multiple pieces of data to be transmitted, reference may be made to the above description, and details of the embodiment of the present application are not described herein again.

It should be noted that, when the second terminal has a plurality of destinations of the data to be transmitted, the first terminal may also select a destination with reference to the rule.

The DRX parameter considered by the MAC entity in selecting the first sidelink resource from the one or more sidelink resources provided by the physical layer may be a destination DRX parameter selected for one SL grant according to the LCP procedure. Specifically, there is a Logical Channel (LCH) and at least one of the MAC CEs having the highest priority destination among all the logical channels and MAC CEs that satisfy the condition. Or, the destination may be a destination having data to be transmitted, and at least one of the resources provided by the physical layer is within the SL DRX-active time of the destination, and at least one of a Logical Channel (LCH) and a MAC CE is selected as the destination having the highest priority among all the logical channels and MAC CEs of the destinations satisfying the above condition.

The DRX state/active time/timer operation state of the destination in the present application may be understood as the DRX state/active time/timer operation state that the first terminal maintains for the destination. Further, the DRX parameter/state/active time/timer operation state of destination, etc. may be the DRX parameter/state/active time/timer operation state of source and destination pair, etc.

When selecting a destination for a SL grant in the LCP process, the SL grant also needs to be satisfied in the SL DRX-active time of the destination. That is, in the determination of the SL grant within the DRX-active time, the determination having the highest priority among all logical channels and MAC CEs satisfying the condition is selected as at least one of LCH and MAC CE.

As shown in fig. 17, taking the destination of DES1 and DES2 as examples, the destination selected by the first terminal is DES2, and then the first terminal can select the sidelink resource within the DRX-active time of DES2 for initially transmitting the data to DES 2.

In another embodiment of the present application, the first terminal may determine the second terminal as follows. For example, the first terminal may first select a SL grant, and then determine a first sidelink resource indicated by the SL grant from one or more sidelink resources. The first terminal determines a time horizon for the first sidelink resource. The first terminal then determines a first destination from the destinations of the plurality of data to be transmitted. The active time of the first destination comprises the time range of the first sidelink resource, namely the time range of the first sidelink resource is positioned in the SL DRX-active time of the first destination.

If there are multiple destinations of the time range including the first sidelink resource, the first terminal may determine a first destination from the multiple destinations according to priorities of the multiple destinations. It should be noted that the priority of a destination can also be regarded as the priority of the data transmitted on the destination.

For example, as shown in fig. 18, the time range of the sidelink resource (e.g., primary transmission sidelink resource 1) selected by the first terminal does not overlap with the SL DRX-active time of DES1 and DES 2. That is, the DES1 and DES2 are not in the SL DRX-active time within the time range of the sidelink resource selected by the first terminal, the first terminal does not generate MAC PDU, and thus the SL grant corresponding to the primary sidelink resource 1 selected by the first terminal is not used.

In the existing standard, for the retransmission grant, the HARQ entity indicates the sidelink process to trigger retransmission, and the sidelink process notifies the physical layer to transmit the SCI and generate a transmission. If no MAC PDU is generated during the initial transmission, SCI and data cannot be transmitted by sidelink process for retransmitting grant. Then, as shown in fig. 18, even if the retransmission-side uplink resource 2 is within the SL DRX-active time of DES2, the first terminal does not transmit on the retransmission-side uplink resource 2, i.e., the second terminal does not use the retransmission grant corresponding to the retransmission-side uplink resource 2.

If the retransmission grant is not in the active time of the destination of the MAC PDU, the transmitted SCI and data will not be received by the destination. Therefore, if the initial transmission grant does not generate a MAC PDU, it is not transmitted on the corresponding retransmission grant.

In another possible embodiment of the present application, as shown in fig. 19, if the MAC PDU is not generated at the initial transmission, for the retransmission grant, if the retransmission grant is not within the SL DRX-active time of the selected destination (DES2), the retransmission grant is not used. The retransmission grant corresponding to the initial transmission grant is a grant for transmitting the same MAC PDU/TB as the initial transmission grant.

If the MAC PDU is not generated in the initial transmission grant, the following processing mode is provided for the retransmission grant:

1) and if the MAC entity does not acquire the MAC PDU of the initial transmission grant, clearing the PSCCH duration and the PSSCH duration corresponding to the retransmission grant associated with the initial transmission grant. Or, if the MAC entity does not acquire the MAC PDU of the primary transmission grant, clearing the retransmission grant associated with the primary transmission grant. Or, if the MAC entity does not transmit data on the initial transmission grant, the MAC entity clears the PSCCH duration and the PSCCH duration corresponding to the retransmission grant associated with the initial transmission grant. Alternatively, if the MAC entity does not transmit data on the primary transmission grant, the MAC entity clears the retransmission grant associated with the primary transmission grant.

2) If a SL grant is available for transmitting retransmission of the MAC PDU and the transmission resource indicated by the SL grant is not within the SL DRX-active time of the destination corresponding to the MAC PDU, the MAC entity clears the PSCCH duration and the PSSCH duration corresponding to the grant, or clears the grant.

3) And if the HARQ buffer associated with the sidelink process associated with one retransmission grant is not empty and the transmission resource indicated by the SL grant is in the SL DRX-active time of destination corresponding to the MAC PDU, the HARQ entity delivers the grant to the sidelink process and indicates the sidelink process to trigger one retransmission. If the HARQ buffer associated with the sidelink process associated with a retransmission grant is empty, or the transmission resource indicated by the SL grant is not in the SL DRX-active time of the destination corresponding to the MAC PDU, the HARQ entity does not submit the grant to the sidelink process, nor indicates the sidelink process to trigger a retransmission.

4) And if the HARQ buffer associated with the sidelink process is not empty and the transmission resource indicated by the stored SL grant is in the SL DRX-active time of destination corresponding to the MAC PDU, the sidelink process indicates the physical layer to transmit the SCI according to the stored SL grant. And if the HARQ buffer associated with the sidelink process is empty, or the transmission resource indicated by the stored SL grant is not in the SL DRX-active time of destination corresponding to the MAC PDU, the sidelink process does not indicate the physical layer to transmit SCI according to the stored SL grant.

In order for the Sidelink process to determine whether the SL grant is at the default SL DRX-active time, the HARQ entity provides/delivers the Destination information of the MAC PDU, such as Destination layer-2ID, Source and Destination pair, Source layer-2ID and Destination layer-2ID pair, or Source layer-1ID and Destination layer-1ID pair, to the Sidelink process.

In the above scheme, if the primary transmission grant is not used, the retransmission grant is also not used, so that power consumption waste can be avoided when the destination does not monitor the PSCCH, psch, SCI, or MAC PDU and the PSCCH, psch, SCI, or MAC PDU is sent.

In another embodiment of the present application, if the time domain position of the first sidelink resource indicated by the initial transmission SL grant selected by the first terminal is not within the SL DRX-active time of the second terminal, but the time domain position of the sidelink resource indicated by the retransmission SL grant is within the SL DRX-active time of the second terminal, the first terminal may send data to the second terminal using the sidelink resource indicated by the retransmission SL grant.

When selecting a destination for a SL grant in the LCP process, it is further required to satisfy that at least one of the initially transmitted SL grant and the corresponding retransmitted SL grant is in the SL DRX-active time of the destination. That is, among the destinations of at least one of the initial transmission SL grant and the retransmission SL grant within the SL DRX-active time, the destination having the highest priority among all logical channels and MAC CEs that satisfy the condition is selected as at least one of the Logical Channel (LCH) and the MAC CE. If there is no qualified destination, no MAC PDU is generated, and the initial transmission SL grant is not used. If a grant is not within the selected destination's SL DRX-active time, the grant is not used.

On the other hand, if the MAC PDU is not generated in the initial transmission grant, the following processing methods are available for the initial transmission grant and the retransmission grant:

1) and if the transmission resource indicated by the initially transmitted SL grant is in the SL DRX-active time of destination corresponding to the MAC PDU, the HARQ entity indicates the sidelink process to trigger a new transmission. And if the transmission resource indicated by the initially transmitted SL grant is not in the SL DRX-active time of destination corresponding to the MAC PDU, the HARQ entity does not indicate the sidelink process to trigger a new transmission. And if the transmission resource indicated by the initially transmitted SL grant is not in the SL DRX-active time of destination corresponding to the MAC PDU, the HARQ entity delivers the MAC PDU and the initially transmitted SL grant to the sidelink process.

2) And if the HARQ buffer associated with the sidelink process associated with one retransmission grant is not empty and the transmission resource indicated by the SL grant is in the SL DRX-active time of destination corresponding to the MAC PDU, the HARQ entity delivers the grant to the sidelink process and indicates the sidelink process to trigger one retransmission. If the HARQ buffer associated with the sidelink process associated with a retransmission grant is empty, or the transmission resource indicated by the SL grant is not in the SL DRX-active time of the destination corresponding to the MAC PDU, the HARQ entity does not submit the grant to the sidelink process, nor indicates the sidelink process to trigger a retransmission.

3) And if the HARQ buffer associated with the sidelink process is not empty and the transmission resource indicated by the stored SL grant is in the SL DRX-active time of destination corresponding to the MAC PDU, the sidelink process indicates the physical layer to transmit the SCI according to the stored SL grant. And if the HARQ buffer associated with the sidelink process is empty, or the transmission resource indicated by the stored SL grant is not in the SL DRX-active time of destination corresponding to the MAC PDU, the sidelink process does not indicate the physical layer to transmit SCI according to the stored SL grant.

As shown in fig. 20, for example, the initial transmission side uplink resource indicated by the initial transmission grant selected by the terminal is not located in the SL DRX-active time of DES1, but the retransmission side uplink resource indicated by the retransmission grant selected by the terminal is located in the SL DRX-active time of DES1, and although the terminal does not use the initial transmission grant for data transmission, the terminal can use the retransmission grant to transmit data.

The waste of power consumption is avoided when the destination does not monitor the PSCCH, PSSCH, SCI or MAC PDU and the PSCCH, PSSCH, SCI or MAC PDU is sent.

In an embodiment of the present application, an embodiment of the present application provides a method for triggering resource selection/reselection, where the method includes:

step a1, the first terminal determines one or more sidelink resources Y for initially transmitting data.

The sidelink resource Y for the initial transfer data is indicated by the initial transfer grant.

Step B1, if the first terminal determines that there is no side link resource with time domain position within DRX-active time of the second terminal in the one or more side link resources Y, the first terminal determines to trigger resource selection/reselection.

The above step A1 and step B1 can be regarded as Resource (re-) selection trigger conditions of the first terminal. The above-mentioned Resource (re-) selection trigger condition detection is performed in the MAC entity. Another possible way is to check during LCP: if no sidelink resource Y for the initial transmission data is within DRX-active time of destination (such as the second terminal) with data, resource selection/reselection is triggered.

It should be noted that the second terminal may be a specific terminal, for example, if there is no sidelink resource located in the DRX-active time of the second terminal, but there are sidelink resources located in DRX-active times of other terminals, the first terminal may or may not select to trigger resource reselection. But if the second terminal represents one or more terminals, the first terminal may choose to trigger a resource reselection if there are no sidelink resources from the one or more sidelink resources Y that are within DRX-active time of any of the one or more terminals.

step a2, the first terminal determines one or more sidelink resources Y for the initial transmission data and Z for the retransmission.

Step B2, if the first terminal determines that there is no sidelink resource for initial transmission with time domain position in DRX-active time of the second terminal in one or more sidelink resources Y, and there is no sidelink resource for retransmission in DRX-active time in the sidelink resource Z for retransmission, the first terminal determines to trigger resource selection/reselection.

The Resource selection/reselection (re-) selection) triggering conditional check described in steps a2 and B2 above is performed in the MAC entity. Another possible way is to check during LCP: if none of the sidelink resources for initial transmission (initial transmission SL grant) and the sidelink resources for retransmission (e.g., sidelink resources indicated by retransmission SLgrant) are within the SL DRX-active time of the second terminal, resource selection/reselection is triggered.

It is noted that the schemes described in step a 1-step B2, or step a 2-step B2 above can be used alone as an example. Of course, the scheme described in step A1-step B1 can also be used in combination with the scheme described in FIG. 5. The scheme described in step A2-step B2 above can also be used in combination with the scheme described in FIG. 5 above. When used in combination, the schemes described in steps a 1-B2, or steps a 2-B2 may be considered as conditions for the first terminal to trigger resource selection/reselection.

The above description mainly introduces the scheme of the embodiment of the present application from the perspective of the network element. It will be appreciated that each network element, e.g. the first terminal, etc., comprises corresponding structures and/or software modules for performing each function in order to implement the above-described functions. Those of skill in the art would readily appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as hardware or combinations of hardware and computer software. Whether a function is performed as hardware or computer software drives hardware depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

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

The method of the embodiment of the present application is described above with reference to fig. 5 to 20, and a communication apparatus provided in the embodiment of the present application for performing the method is described below. Those skilled in the art will appreciate that the method and apparatus can be combined and referred to each other, and the communication apparatus provided in the embodiments of the present application can perform the steps performed by the first terminal in the above communication method.

In the case of employing an integrated unit, fig. 21 shows a communication apparatus referred to in the above-described embodiment, which may include: a communication module 2113 and a processing module 2112.

In an alternative implementation, the communications apparatus can also include a storage module 2111 for storing program codes and data for the communications apparatus.

In one example, the communication device is a first terminal or a chip applied in the first terminal. In this case, the communication module 2113 is used to support the communication device in communication with an external network element (e.g., a second terminal). For example, the communication module 2113 is used for performing the transceiving operation of the first terminal in the above method embodiment. The processing module 2112 is configured to perform the processing operation of the first terminal in the above method embodiment.

For example, the communication module 2113 is configured to perform the sending action performed by the first terminal in step 501 of fig. 5 in the foregoing embodiment. A processing module 2112 for enabling the communication device to perform the processing actions performed by the first terminal in the above embodiments, such as step 502.

It should be noted that the communication module 2113 shown in fig. 21 may also be replaced by a communication unit, and the processing module 2112 may also be replaced by a processing unit. The memory module 2111 may also be replaced with a memory cell. The processing unit is used for controlling and managing the operation of the communication device, and for example, the processing unit is used for executing the steps of information/data processing in the communication device. The communication unit is used for supporting the steps of information/data transmission or reception of the communication device.

In one possible implementation, the communication unit may include a receiving unit for receiving a signal and a transmitting unit for transmitting a signal.

The processing module 2112 may be a processor or controller, such as a central processing unit, general purpose processor, digital signal processor, application specific integrated circuit, field programmable gate array or other programmable logic device, transistor logic device, hardware component, or any combination thereof. Which may implement or perform the various illustrative logical blocks, modules, and circuits described in connection with the disclosure. A processor may also be a combination of computing functions, e.g., a combination of one or more microprocessors, a digital signal processor and a microprocessor, or the like. The communication module may be a transceiver, a transceiving circuit or a communication interface, etc. The storage module may be a memory.

When the processing module 2112 is the processor 21 or the processor 25, the communication module 2113 is the transceiver 23, and the storage module 2111 is the memory 22, the communication device according to the present application may be the communication device shown in fig. 2.

The above communication module may be a communication interface of the apparatus for receiving signals from other apparatuses. For example, when the device is implemented in the form of a chip, the communication module is a communication interface for the chip to receive signals from other chips or devices or to transmit signals.

Fig. 22 is a schematic structural diagram of a chip 220 provided in an embodiment of the present application. Chip 220 includes one or more (including two) processors 2210 and a communication interface 2230.

Optionally, the chip 220 further includes a memory 2240, where the memory 2240 may include a read only memory and a random access memory, and provides operating instructions and data to the processor 2210. A portion of memory 2240 may also include non-volatile random access memory (NVRAM).

In some embodiments, memory 2240 stores elements, execution modules or data structures, or a subset thereof, or an extended set thereof.

In the embodiment of the present application, by calling an operation instruction stored in the memory 2240 (the operation instruction may be stored in an operating system), a corresponding operation is performed.

Processor 2210 controls the processing operations of the first terminal, processor 2210 may also be referred to as a Central Processing Unit (CPU).

Memory 2240 may include both read-only memory and random-access memory, and provides instructions and data to processor 2210. A portion of the memory 2240 may also include NVRAM. For example, in-application memory 2240, communication interface 2230, and memory 2240 are coupled together by a bus system 2220, where bus system 2220 may include a power bus, a control bus, and a status signal bus, among others, in addition to a data bus. For clarity of illustration, however, the various buses are labeled in fig. 22 as the bus system 2220.

The methods disclosed in the embodiments of the present application may be implemented in processor 2210, or implemented by processor 2210. Processor 2210 may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the above-described method may be performed by instructions in the form of hardware, integrated logic circuits, or software in processor 2210. The processor 2210 may be a general purpose processor, a Digital Signal Processor (DSP), an ASIC, an off-the-shelf programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components. The various methods, steps, and logic blocks disclosed in the embodiments of the present application may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in connection with the embodiments of the present application may be directly implemented by a hardware decoding processor, or implemented by a combination of hardware and software modules in the decoding processor. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium is located in the memory 2240, and the processor 2210 reads the information in the memory 2240, and performs the steps of the above method in conjunction with the hardware thereof.

In one possible implementation, the communication interface 2230 is configured to perform the steps of receiving and transmitting by the first terminal in the embodiments shown in fig. 5 or fig. 7. Processor 2210 is used to perform the steps of the processing of the first terminal in the embodiment shown in fig. 5 or fig. 7.

In one aspect, a computer-readable storage medium is provided, having stored therein instructions, which when executed, implement the functions performed by the first terminal as in fig. 5 or fig. 7.

In one aspect, a computer program product comprising instructions is provided, the computer program product comprising instructions that, when executed, implement the functions performed by the first terminal as in fig. 5 or fig. 7.

In one aspect, a chip is provided, the chip is applied to a first terminal, the chip includes at least one processor and a communication interface, the communication interface is coupled to the at least one processor, and the processor is configured to execute instructions to implement the functions performed by the first terminal in fig. 5 or fig. 7.

An embodiment of the present application provides a communication system, including: a first terminal and a second terminal. Wherein the first terminal is configured to perform the functions as performed by the first terminal in fig. 5 or fig. 7, and the second terminal is configured to receive data from the first terminal on a first sidelink resource located within a sidelink drx-activation time of the second terminal.

Embodiment 1, a communication method, applied to a first terminal, includes:

the first terminal determines one or more sidelink resources, wherein the one or more sidelink resources comprise at least a sidelink resource located within a sidelink discontinuous reception-activation time of a second terminal;

the first terminal sends data to the second terminal on a first sidelink resource in the one or more sidelink resources, and the first sidelink resource is located in the sidelink discontinuous reception-activation time.

Embodiment 2, the method of embodiment 1, wherein a number of sidelink resources of the one or more sidelink resources that are within a first time period is greater than or equal to a first threshold;

the starting time of the first time period is the starting time corresponding to the candidate resource set, and the ending time of the first time period is the ending time of the sidelink discontinuous reception-activation time.

Embodiment 3, the method according to embodiment 1 or embodiment 2, wherein the one or more sidelink resources are sidelink resources determined from a candidate resource set, and a starting time of the candidate resource set is later than or equal to a starting time of the sidelink drx-activation time; or,

the one or more sidelink resources are sidelink resources determined from a candidate resource set, and the deadline time corresponding to the candidate resource set is earlier than or equal to the retransmission ending time of the data.

Embodiment 4 and the method according to any of embodiments 1 to 3, wherein the determining, by the first terminal, the one or more sidelink resources includes: the physical layer of the first terminal determining the one or more sidelink resources from a set of candidate resources; the physical layer reports the one or more side link resources to a media access control entity of the first terminal;

before the first terminal sends data to the second terminal on a first sidelink resource of the one or more sidelink resources, the method provided by the embodiment of the present application further includes: the media access control entity selects the first sidelink resource located within the sidelink discontinuous reception-activation time from the one or more sidelink resources.

Embodiment 5, according to the method described in embodiment 4, the method provided in the embodiment of the present application further includes: the media access control entity sends the first information to the physical layer, wherein the first information comprises: information indicating an end time of the sidelink DRX-active time or information indicating a remaining time of the sidelink DRX-active time;

the physical layer of the first terminal determining the one or more sidelink resources from a set of candidate resources, comprising:

the physical layer determines the one or more sidelink resources from a set of candidate resources based on the first information.

Embodiment 6, according to the method of embodiment 5, the sending, by the media access control entity, the first information to the physical layer includes: when the remaining time of the sidelink discontinuous reception-activation time is less than or equal to the remaining packet delay budget, the media access control entity sends the first information to the physical layer.

Embodiment 7, the method of embodiment 5 or embodiment 6, wherein the first information further comprises: information indicating a start time of the sidelink discontinuous reception-activation time.

Embodiment 8, according to the method of embodiment 7, when a time unit 1 is located before the start time of the sidelink drx-activation time, a mac entity of the first terminal sends information indicating the start time of the sidelink drx-activation time to a physical layer of the first terminal, and the time unit 1 determines a time for sensing sidelink resources for the physical layer of the first terminal.

Embodiment 9 and the method according to any one of embodiments 4 to 8, the method provided in the embodiments of the present application further includes: the first terminal determines a retransmission end time of the data or a remaining retransmission time of the data. And the first terminal determines the ending time corresponding to the candidate resource set according to the retransmission ending time or the residual retransmission time, wherein the ending time corresponding to the candidate resource set is earlier than or equal to the retransmission ending time.

Embodiment 10, according to the method described in embodiment 9, the method provided in the embodiment of the present application further includes: the media access control entity sends second information to the physical layer, wherein the second information is used for indicating the retransmission ending time of the data or indicating the residual retransmission time of the data;

the determining, by the first terminal, a retransmission end time of the data or a remaining retransmission time of the data includes:

and the physical layer determines the retransmission ending time or the residual retransmission time according to the second information.

Embodiment 11 the method of embodiment 10, wherein,

if the remaining packet delay budget is greater than or equal to the remaining retransmission time, the media access control entity provides one or more of the retransmission end time or the remaining retransmission time to the physical layer, or the media access control entity provides a minimum of the remaining packet delay budget and the retransmission end time to the physical layer.

Embodiment 12 and the method according to any one of embodiments 2 to 11, the method provided in the embodiments of the present application further includes:

if the number of sidelink resources located in the first time period is less than or equal to the first threshold, the first terminal updates the threshold of whether the candidate resource set is excluded;

the first terminal determines the one or more sidelink resources from the candidate resource set according to the updated threshold.

Embodiment 13, the method of any one of embodiments 1 to 12, wherein a number of sidelink resources in the one or more sidelink resources that are located within a second time period is greater than or equal to a second threshold;

the second time period is determined by the deadline of the sidelink discontinuous reception-activation time and the deadline corresponding to the candidate resource set.

Embodiment 14 and the method according to any one of embodiments 1 to 13, wherein the first sidelink resource is a sidelink resource for transmitting the data for the first time, and the method further includes:

and the first terminal determines a second sidelink resource, wherein the second sidelink resource is a resource for retransmitting the data, the second sidelink resource is positioned in the discontinuous reception-activation time of the sidelink or a third time period, and the third time period is determined according to the first sidelink resource. For example, the first terminal may determine the second sidelink resource from one or more sidelink resources. At this time, the one or more sidelink resources may further include a sidelink resource within the third time period.

Embodiment 15 the method of embodiment 14, wherein a time interval between the first sidelink resource and the second sidelink resource is greater than or equal to a minimum time interval.

Embodiment 16 and the method according to any of embodiments 1 to 14, wherein when a physical sidelink feedback control channel resource is configured in a resource pool in which the first sidelink resource and the second sidelink resource are located, a time interval between the first sidelink resource and the second sidelink resource is greater than or equal to a minimum time interval.

Embodiment 17, the method according to any of embodiments 1 to 16, wherein if there is no sidelink resource for transmitting the data for the first time within the sidelink drx-active time, the first terminal triggers a process of selecting/reselecting the sidelink resource.

Embodiment 18, the method of embodiment 17, wherein no sidelink resources to retransmit the data exist within the sidelink drx-active time, and the first terminal triggers a process of selecting/reselecting sidelink resources.

Embodiment 19, according to any one of embodiments 1 to 13, and embodiment 17, wherein if the sidelink resource used for the initial transmission of the data is not located within the sidelink discontinuous reception-activation time, the first sidelink resource is a sidelink resource used for the retransmission of the data.

Embodiment 20, the method of any of embodiments 1-13, 17, further comprising:

and if the sidelink resources used for initially transmitting the data are not positioned in the discontinuous receiving-activating time of the sidelink, the first terminal abandons the data transmission on the second sidelink resources used for retransmitting the data.

Embodiment 21, a communication apparatus, the apparatus being applied to a first terminal, the apparatus comprising:

a processor configured to determine one or more sidelink resources, wherein the one or more sidelink resources comprise at least a sidelink resource located within a sidelink discontinuous reception-activation time of a second terminal;

a transceiver configured to transmit data to the second terminal on a first sidelink resource of the one or more sidelink resources, the first sidelink resource being located within the sidelink discontinuous reception-activation time.

Embodiment 22 the apparatus of embodiment 21, wherein a number of sidelink resources of the one or more sidelink resources that are within a first time period is greater than or equal to a first threshold;

Embodiment 23, the apparatus of embodiment 21 or embodiment 22, wherein the one or more sidelink resources are sidelink resources determined from a candidate resource set, and a starting time of the candidate resource set is later than or equal to a starting time of the sidelink drx-activate time; or,

Embodiment 24, the apparatus of any one of embodiments 21 to 23, the processor configured to determine the one or more sidelink resources, including: a processor configured to determine the one or more sidelink resources from a set of candidate resources by a physical layer of the first terminal; a processor, configured to report the one or more sidelink resources to a media access control entity of the first terminal through a physical layer;

the method provided by the embodiment of the application further comprises the following steps: a processor configured to select, by a media access control entity of the first terminal, the first sidelink resource located within the sidelink discontinuous reception-activation time from the one or more sidelink resources.

Embodiment 25 and the apparatus according to embodiment 24, wherein the processor in this embodiment is configured to send the first information to a physical layer of the first terminal through a media access control entity of the first terminal, where the first information includes: information indicating an end time of the sidelink DRX-active time or information indicating a remaining time of the sidelink DRX-active time;

a processor configured to determine the one or more sidelink resources from a candidate set of resources via a physical layer of the first terminal, comprising: a processor configured to determine, by a physical layer of the first terminal, the one or more sidelink resources from a candidate resource set based on the first information.

Embodiment 26, the apparatus of embodiment 25, the processor configured to send the first information to the physical layer through a medium access control entity, including: the processor is configured to send the first information to the physical layer through the mac entity when a remaining time of the sidelink drx-drx activation time is less than or equal to a remaining packet delay budget.

Embodiment 27, the apparatus of embodiment 25 or embodiment 26, the first information further comprising: information indicating a start time of the sidelink discontinuous reception-activation time.

Embodiment 28, the apparatus of embodiment 26, wherein the mac entity of the first terminal sends information indicating the start time of the sidelink drx-activation time to the physical layer of the first terminal when a time unit 1 is located before the start time of the sidelink drx-activation time, and the time unit 1 determines a time for the physical layer of the first terminal to perceive sidelink resources.

Embodiment 29, the apparatus as in any one of embodiments 24 to 28, the processor being further configured to determine an end time of retransmission of the data or a remaining retransmission time of the data. And the processor is further used for determining the ending time corresponding to the candidate resource set according to the retransmission ending time or the residual retransmission time, wherein the ending time corresponding to the candidate resource set is earlier than or equal to the retransmission ending time.

Embodiment 30, the apparatus of embodiment 29, the processor further configured to send, by a media access control entity, second information to the physical layer, where the second information is used to indicate a retransmission end time of the data or used to indicate a remaining retransmission time of the data;

a processor configured to determine a retransmission end time of the data or a remaining retransmission time of the data, comprising:

the processor is configured to determine, by the physical layer, the retransmission end time or the remaining retransmission time according to the second information.

Embodiment 31 the apparatus of embodiment 30, wherein,

a processor configured to provide one or more of the retransmission end time or the remaining retransmission time to the physical layer via the media access control entity, or the processor configured to provide a minimum of the remaining packet delay budget and the retransmission end time to the physical layer via the media access control entity, if the remaining packet delay budget is greater than or equal to the remaining retransmission time.

Embodiment 32 the apparatus of any one of embodiments 22 to 31,

the processor is further configured to update a threshold for whether a candidate set of resources is excluded if the number of sidelink resources located within the first time period is less than or equal to the first threshold;

the processor is further configured to determine the one or more sidelink resources from the candidate resource set based on the updated threshold.

Embodiment 33 the apparatus of any one of embodiments 21 to 32, wherein a number of sidelink resources of the one or more sidelink resources that are located within the second time period is greater than or equal to a second threshold;

Embodiment 34, the apparatus according to any one of embodiments 21 to 33, wherein the first sidelink resource is a sidelink resource for initially transmitting the data, and the processor is further configured to determine a second sidelink resource, the second sidelink resource is a resource for retransmitting the data, the second sidelink resource is located in the sidelink drx-activation time or a third time period, and the third time period is determined according to the first sidelink resource. For example, the first terminal may determine the second sidelink resource from one or more sidelink resources. At this time, the one or more sidelink resources may further include a sidelink resource within the third time period.

Embodiment 35 the apparatus of embodiment 34, wherein a time interval between the first sidelink resource and the second sidelink resource is greater than or equal to a minimum time interval.

Embodiment 36 and the apparatus according to any one of embodiments 21 to 35, wherein when a physical sidelink feedback control channel resource is configured in a resource pool in which the first sidelink resource and the second sidelink resource are located, a time interval between the first sidelink resource and the second sidelink resource is greater than or equal to a minimum time interval.

Embodiment 37 the apparatus of any one of embodiments 21 to 36, wherein if there is no sidelink resource for first transmitting the data within the sidelink drx-active time, the transceiver triggers a process of selecting/reselecting the sidelink resource.

Embodiment 38 the apparatus of embodiment 37, wherein no sidelink resources to retransmit the data exist within the sidelink drx-active time, and the processor triggers the selection/reselection of the sidelink resources.

Embodiment 39 and the apparatus of any one of embodiments 21 to 33 and embodiment 38, wherein the first sidelink resource is a sidelink resource for retransmitting the data if the sidelink resource for initially transmitting the data is not located within the sidelink DRX-activated time.

Embodiment 40 the apparatus of any one of embodiments 21 to 33 or 38,

the processor abstains from transmitting the data over a second sidelink resource for retransmitting the data via the transceiver if the sidelink resource for initially transmitting the data is not located within the sidelink discontinuous reception-activation time.

Embodiment 41, a method of communication, the method comprising:

the first terminal determines a first sidelink resource for initially transmitting data.

If the first terminal determines that the first sidelink resource is not within the second terminal's SL DRX-active time, the first terminal abstains from sending data to the second terminal on the second sidelink resource for retransmitting the data.

The first authorization is an initial transmission authorization, and the sidelink resources indicated by the initial transmission authorization are used for initially transmitting data. The second grant is a retransmission grant, and the sidelink resource indicated by the second grant is used for retransmitting data. The second grant corresponding to the first grant is used for transmitting the same grant as the data carried on the primary transfer grant.

Embodiment 42, the method according to embodiment 41, wherein the determining, by the first terminal, the first sidelink resource for the initial transmission of data may include: the first terminal determines a first authorization for initially transmitting data, and the first terminal determines a sidelink resource indicated by the first authorization as a first sidelink resource for initially transmitting data.

Embodiment 43 the method of embodiment 41 or embodiment 42, wherein the first terminal determines the second sidelink resource.

Embodiment 44, the method of embodiment 43, wherein the determining, by the first terminal, the second sidelink resource comprises: the first terminal determines a second authorization corresponding to the first authorization. And the first terminal determines the sidelink resources indicated by the second authorization as second sidelink resources.

Embodiment 45, and the method of any one of embodiments 41 to 44, wherein the first terminal abandons sending data to the second terminal on the second sidelink resource for retransmission of the data, includes: and if the second side link resource is not positioned in the DRX-activation time of the second terminal, the first terminal abandons the data transmission to the second terminal on the side link resource indicated by the second authorization corresponding to the first authorization.

Embodiment 46 and the method according to any one of embodiments 41 to 45, the method provided in this application embodiment may further include: and the first terminal determines that the second sidelink resource is positioned in the DRX-activated time of the second terminal, and the first terminal sends data to the second terminal on the second sidelink resource for retransmitting the data.

Embodiment 47 and the method according to any of claims 41 to 46, wherein the second terminal is any one of the plurality of terminals that needs to receive the data transmitted by the first terminal, or the second terminal is the terminal with the highest priority among the plurality of terminals that needs to receive the data transmitted by the first terminal.

Embodiment 48, a method of communication, the method comprising: the first terminal determines a first sidelink resource for initially transmitting data. If the first terminal determines that the first sidelink resource is not within the sidelink DRX-active time of the second terminal, the first terminal transmits data to the second terminal on a second sidelink resource for retransmitting the data.

If the first terminal determines that the first sidelink resource is not located within the SL DRX-activation time of the second terminal, the first terminal sends data to the second terminal on the sidelink resource indicated by the second authorization corresponding to the first authorization.

Embodiment 49 and the method of embodiment 48, wherein the determining, by the first terminal, the first sidelink resource for the initial transmission of data may include: the first terminal determines a first authorization for initially transmitting data, and the first terminal determines a sidelink resource indicated by the first authorization as a first sidelink resource for initially transmitting data.

Embodiment 50, according to the method described in embodiment 48 or embodiment 49, the method provided in the embodiment of the present application may further include: the first terminal determines second sidelink resources.

Embodiment 51 the method of embodiment 50, wherein the determining, by the first terminal, the second sidelink resource comprises: the first terminal determines a second authorization corresponding to the first authorization. And the first terminal determines the sidelink resources indicated by the second authorization as second sidelink resources.

Embodiment 52, according to the methods in embodiments 48 to 51, where a first terminal sends data to a second terminal on a second sidelink resource used for retransmitting the data, the method includes: the first terminal sends data to the second terminal on the second sidelink resource if the second sidelink resource is within the DRX-active time of the second terminal.

Embodiment 53 and the method according to embodiments 48 to 52, wherein the second terminal is any one of the plurality of terminals that need to receive the data transmitted by the first terminal, or the second terminal is the terminal with the highest priority among the plurality of terminals that need to receive the data transmitted by the first terminal.

Embodiment 54, a communication device, the device comprising a chip that is or is applied in a first terminal, the device comprising:

a processor configured to determine a first sidelink resource for initially transmitting data.

The transceiver is configured to forgo sending data to the second terminal on the second sidelink resource for retransmitting the data if the first terminal determines that the first sidelink resource is not within the second terminal's SL DRX-active time.

Embodiment 55, the apparatus of embodiment 54, wherein the determining, by the first terminal, the first sidelink resource for the initial transmission of data may include: the first terminal determines a first authorization for initially transmitting data, and the first terminal determines a sidelink resource indicated by the first authorization as a first sidelink resource for initially transmitting data.

Embodiment 56 the apparatus of embodiment 54 or embodiment 55, wherein the first terminal determines the second sidelink resource.

Embodiment 57 the apparatus of embodiment 56, wherein the determining of the second sidelink resource by the first terminal comprises: the first terminal determines a second authorization corresponding to the first authorization. And the first terminal determines the sidelink resources indicated by the second authorization as second sidelink resources.

Embodiment 58 the apparatus of any one of embodiments 54 to 47, the transceiver configured to forgo transmission of data to the second terminal on the second sidelink resource for retransmission of the data, comprising: if the second sidelink resource is not located within the DRX-activation time of the second terminal, the transceiver abandons sending data to the second terminal on the sidelink resource indicated by the second grant corresponding to the first grant.

Embodiment 59 the apparatus of any one of embodiments 54 to 58, wherein the transceiver is configured to send the data to the second terminal on the second sidelink resource for retransmitting the data if the processor determines that the second sidelink resource is within the DRX-active time of the second terminal.

Embodiment 60, the method according to any of claims 54 to 59, wherein the second terminal is any of a plurality of terminals that need to receive the data sent by the first terminal, or the second terminal is the highest priority terminal among the plurality of terminals that need to receive the data sent by the first terminal.

Embodiment 61, a communication device, the device comprising: a processor configured to determine a first sidelink resource for initially transmitting data. And a transceiver for transmitting data to the second terminal on a second sidelink resource for retransmitting the data if the processor determines that the first sidelink resource is not located within a sidelink DRX-activation time of the second terminal.

Embodiment 62, the apparatus of embodiment 61, the determining, by the first terminal, the first sidelink resource for the initial transmission of data may include: the first terminal determines a first authorization for initially transmitting data, and the first terminal determines a sidelink resource indicated by the first authorization as a first sidelink resource for initially transmitting data.

Embodiment 63, the apparatus of embodiment 61 or embodiment 62, the processor further configured to determine a second sidelink resource.

Embodiment 64 the apparatus of embodiment 63, the processor, further configured to determine second sidelink resources, comprising: the processor is further configured to determine a second authorization corresponding to the first authorization. The processor is further configured to determine the sidelink resource indicated by the second grant as a second sidelink resource.

Embodiment 65, the apparatus according to embodiment 61 to embodiment 64, the transceiver configured to transmit data to the second terminal on the second sidelink resource for retransmitting the data, comprising: and a transceiver for transmitting data to the second terminal on the second sidelink resource if the processor determines that the second sidelink resource is within the DRX-activation time of the second terminal.

Embodiment 66 and the apparatuses according to embodiments 61 to 65, wherein the second terminal is any one of the terminals that need to receive the data transmitted by the first terminal, or the second terminal is a terminal having a highest priority among the terminals that need to receive the data transmitted by the first terminal.

Embodiment 67, a computer readable storage medium having stored thereon instructions that, when executed, implement the method of any one of embodiments 1-20.

Embodiment 68 is a computer readable storage medium having stored thereon instructions that, when executed, implement the method of any one of embodiments 41-47.

Embodiment 69 is a computer readable storage medium having stored thereon instructions that, when executed, perform the method of any one of embodiments 48-53.

Embodiment 70, a chip comprising a processor coupled to a communication interface, the processor configured to execute a computer program or instructions to implement the method according to any one of embodiments 1-20, the communication interface configured to communicate with a module other than the chip.

Embodiment 71, a chip comprising a processor coupled to a communication interface, the processor configured to execute a computer program or instructions to implement the method according to any of embodiments 41-47, the communication interface configured to communicate with a module other than the chip.

Embodiment 72, a chip comprising a processor coupled to a communication interface, the processor configured to execute a computer program or instructions to implement the method of any of embodiments 48-53, the communication interface configured to communicate with a module other than the chip.

Embodiment 73, a terminal, comprising: at least one processor coupled to the memory, the at least one processor configured to execute instructions stored in the memory to implement a method as in any one of embodiments 1-20.

Embodiment 74, a terminal, comprising: at least one processor coupled to the memory, the at least one processor configured to execute instructions stored in the memory to implement the method as in any one of embodiments 41-47.

Embodiment 75, a terminal, comprising: at least one processor coupled to the memory, the at least one processor configured to execute instructions stored in the memory to implement a method as in any one of embodiments 48-53.

Claims

1. A communication method, applied to a first terminal, the method comprising:

determining one or more sidelink resources, wherein the one or more sidelink resources comprise at least a sidelink resource located within a sidelink discontinuous reception-activation time of the second terminal;

and transmitting data to the second terminal on a first sidelink resource of the one or more sidelink resources, wherein the first sidelink resource is located within the sidelink discontinuous reception-activation time.

2. The method of claim 1,

a number of sidelink resources of the one or more sidelink resources that are within a first time period is greater than or equal to a first threshold;

3. The method of claim 1 or 2, wherein the one or more sidelink resources are sidelink resources determined from a candidate set of resources corresponding to a starting time that is later than or equal to a starting time of the sidelink DRX-activation time; or,

4. The method of any of claims 1-3, wherein determining the one or more sidelink resources comprises:

the physical layer of the first terminal determining the one or more sidelink resources from a set of candidate resources;

the physical layer reports the one or more side link resources to a media access control entity of the first terminal;

the method further comprises the following steps:

the media access control entity selects the first sidelink resource located within the sidelink discontinuous reception-activation time from the one or more sidelink resources.

5. The method of claim 4, further comprising:

the media access control entity sends first information to the physical layer, wherein the first information comprises: information indicating an end time of the sidelink DRX-active time or information indicating a remaining time of the sidelink DRX-active time;

6. The method of claim 5, wherein the media access control entity sends the first information to the physical layer, and wherein the sending comprises:

when the remaining time of the sidelink discontinuous reception-activation time is less than or equal to the remaining packet delay budget, the media access control entity sends the first information to the physical layer.

7. The method of claim 5 or 6, wherein the first information further comprises: information indicating a start time of the sidelink discontinuous reception-activation time.

8. The method of claim 7, wherein a media access control entity of the first terminal sends information indicating the starting time of the sidelink DRX-activated time to a physical layer of the first terminal when time unit 1 is located before the starting time of the sidelink DRX-activated time, and wherein time unit 1 determines a time for the physical layer of the first terminal to perceive sidelink resources.

9. The method according to any one of claims 4 to 8, further comprising:

determining a retransmission end time of the data or a remaining retransmission time of the data;

and determining the ending time corresponding to the candidate resource set according to the retransmission ending time or the residual retransmission time, wherein the ending time corresponding to the candidate resource set is earlier than or equal to the retransmission ending time.

10. The method of claim 9, further comprising:

the media access control entity sends second information to the physical layer, wherein the second information is used for indicating the retransmission ending time of the data or indicating the residual retransmission time of the data;

the determining the retransmission end time of the data or the remaining retransmission time of the data includes:

11. The method of claim 10,

12. The method according to any one of claims 2 to 11, further comprising:

if the number of sidelink resources located within the first time period is less than or equal to the first threshold, updating a threshold for whether a candidate resource set is excluded;

determining the one or more sidelink resources from the candidate resource set based on the updated threshold.

13. The method of any one of claims 1 to 12, wherein the number of sidelink resources within the second time period of the one or more sidelink resources is greater than or equal to a second threshold;

14. The method according to any one of claims 1 to 13, wherein the first sidelink resource is a sidelink resource for initially transmitting the data, the method further comprising:

and the first terminal determines a second sidelink resource for retransmitting the data, wherein the second sidelink resource is positioned in the sidelink discontinuous reception-activation time or a third time period, and the third time period is determined according to the first sidelink resource.

15. The method of claim 14, wherein a time interval between the first sidelink resource and the second sidelink resource is greater than or equal to a minimum time interval.

16. The method of claim 14, wherein when a resource pool in which the first sidelink resource and the second sidelink resource are located is configured with a physical sidelink feedback control channel resource, a time interval between the first sidelink resource and the second sidelink resource is greater than or equal to a minimum time interval.

17. The method according to any of claims 1 to 16, wherein there are no sidelink resources for transmitting the data for the first time and/or no sidelink resources for retransmitting the data within the sidelink drx-active time, and the first terminal triggers a process for selecting/reselecting the sidelink resources.

18. The method according to any one of claims 1 to 13 and 17,

if the sidelink resource used for initially transmitting the data is not positioned in the discontinuous reception-activation time of the sidelink, the first sidelink resource is the sidelink resource used for retransmitting the data;

the method further comprises the following steps:

19. A computer-readable storage medium having stored thereon instructions which, when executed, implement the method of any one of claims 1 to 18.

20. A chip comprising a processor coupled to a communication interface, the processor being configured to run a computer program or instructions to implement the method of any of claims 1 to 18, the communication interface being configured to communicate with a module external to the chip.

21. A terminal, comprising: at least one processor coupled with a memory, the at least one processor to execute instructions stored in the memory to perform the method of any of claims 1-18.