CN113645680A

CN113645680A - Method, device and system for determining side link resources

Info

Publication number: CN113645680A
Application number: CN202010787192.0A
Authority: CN
Inventors: 张梦晨; 刘云; 邝奕如; 徐海博
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2020-04-27
Filing date: 2020-08-05
Publication date: 2021-11-12
Anticipated expiration: 2040-08-05
Also published as: CN113645680B

Abstract

The embodiment of the application provides a method, a device and a system for determining sidelink resources, relates to the technical field of communication, and is used for realizing that a receiving party terminal provides auxiliary information for a sending party terminal so as to improve the quality of receiving service data by the receiving party terminal and reduce the power consumption of the receiving party terminal, the scheme is applied to a first terminal, the first terminal has an activated state and a dormant state, and the scheme comprises the following steps: side link resources are perceived. Determining information of candidate sidelink resources located within a first time period during which the first terminal is in the active state. And sending first information to a second terminal, wherein the first information is used for indicating information of sidelink resources, and the sidelink resources are all or part of sidelink resources in the candidate sidelink resources. 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

Method, device and system for determining side link resources

The present application claims priority from a chinese patent application filed by the national intellectual property office on 27/04 of 2020, having application number 202010345081.4 entitled "a method and UE for providing auxiliary information", 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 method, a device and a system for determining sidelink resources.

Background

In a Long Term Evolution (LTE) system or a New Radio (NR) system, data may be transmitted between terminals through sidelink resources. Specifically, when a transmitting terminal (Tx UE) transmits traffic data to a receiving terminal (Rx UE), the Rx UE may sense (sensing) sidelink resources in a resource pool to determine a target sidelink resource. The Rx UE then transmits assistance information to the Tx UE indicating the target sidelink resource selected by the Rx UE. The Tx UE may then consider the assistance information transmitted by the Rx UE when making the sidelink resource selection. For example, the Tx UE selects a sidelink resource for transmitting traffic data to the Rx UE from the target sidelink resources, which can improve the data reception quality of the Rx UE.

However, the Rx UE does not always receive the traffic data during the whole time period, and in the prior art, before the Rx UE transmits the auxiliary information to the Tx UE, the whole time period is in a listening state regardless of whether the traffic data is received or not. This may cause Rx UEs to consume excessive power.

Disclosure of Invention

The embodiment of the application provides a method, a device and a system for determining sidelink resources, which are used for realizing that a receiving terminal provides auxiliary information to a sending terminal so as to improve the communication quality of the receiving terminal for receiving service data and reduce the power consumption of the receiving terminal.

In order to achieve the purpose, the technical scheme is as follows:

in a first aspect, an embodiment of the present application provides a method for determining a sidelink resource, where the method is applied to a first terminal, and the first terminal has an active state and a dormant state, and the method provided in the embodiment of the present application includes: the first terminal is aware of sidelink resources. The first terminal determines information of candidate sidelink resources located in a first time period, wherein the first terminal is in an active state. And the first terminal sends first information to the second terminal, wherein the first information is information used for indicating the sidelink resources, and the sidelink resources are all or part of the candidate sidelink resources.

Based on this, the embodiment of the present application provides a method for determining a sidelink resource, in which, when a first terminal has an active state and a dormant state, in order to avoid that the first terminal provides a sidelink resource that does not belong to an active time (time range of the active state), the first terminal senses the sidelink resource. The first terminal determines information of candidate sidelink resources located within a first time period, within which the first terminal is in an active state. The first terminal then provides the second terminal with first information indicating information of sidelink resources, which are all or part of the candidate sidelink resources. Because the time domain position of the sidelink resource is located in the time period when the first terminal is in the activated state, the sidelink resource which does not belong to the active time range can be prevented from being provided by the first terminal, and the sidelink resource is a resource which is recommended by the first terminal to the second terminal and is used for sending service data to the first terminal, so that the data receiving quality of the first terminal can be ensured. Furthermore, the first terminal has an active state and a dormant state, and the first terminal does not need to monitor the PSCCH in the dormant state, so that the purpose of saving power for the first terminal can be achieved.

In one possible implementation manner, taking the example that the first terminal includes a MAC layer and a PHY layer, the first terminal perceives the sidelink resources and includes: the MAC layer transmits a sensing indication and information used for indicating a first time period to the PHY, wherein the sensing indication is used for informing the PHY of sensing the side link resource. The first terminal determines the information of the candidate sidelink resources in the first time period, and comprises the following steps: and the PHY determines the information of the candidate side link resources in the first time period from the perceived side link resources, and reports the information of the candidate side link resources to the MAC layer.

In one possible implementation, the first terminal employs a Discontinuous Reception (DRX) mechanism, the DRX mechanism includes an active period and a dormant period, and the MAC layer transmits a sensing indication and information indicating a first time period to the PHY, including: the MAC layer sends a sensing indication and information used for indicating a first time period to the PHY at a first time, wherein the first time is in a sleep period, and the first time is before the first time period, and the first time period is in an active period. It is understood that the active period of the first time period and the dormant period of the first time point are located in different DRX cycles, for example, the dormant period is a dormant period in a first DRX cycle, the active period of the first time period is an active period in a second DRX cycle, the first DRX cycle is located before the second DRX cycle, and optionally, the first DRX cycle is adjacent to the second DRX cycle. And triggering the PHY to start resource sensing by using the sensing indication, so as to avoid that the first terminal is always in a resource sensing state. In the scheme, before the activation period in the second DRX period begins, the MAC layer of the first terminal informs the PHY layer of beginning to sense the sidelink resources and indicates to the PHY layer to report the sidelink resources in the activation period in the second DRX period as candidate sidelink resources.

In a possible implementation manner, the sending, by the first terminal, the first information to the second terminal includes: the first terminal sends the first information to the second terminal at the second moment. The second time is within the sleep period, and the second time is before the first time period. The timeliness of the first information is guaranteed.

In one possible implementation, the first terminal employs a Discontinuous Reception (DRX) mechanism, the DRX mechanism comprising an active period and a dormant period, and the MAC layer transmits a sensing indication and information indicating a first time period to the PHY, including: the MAC layer transmits a sensing indication and information used for indicating a first time period to the PHY at a first moment, and the first terminal is in an active state at the first moment. The first time period is a timing duration of a first timer of the first terminal, and the first timer is used for maintaining an activation state of the first terminal. Because the first terminal maintains the activated state of the first terminal during the operation period of the first timer, and the first terminal can detect the service data within the operation duration of the first timer, it is convenient for the first terminal to indicate, to the second terminal, the sidelink resource located within the operation duration of the first timer after the activation period by using the first information.

In a possible implementation manner, the method provided in the embodiment of the present application further includes: and in the running process of any timer corresponding to the activation state of the first terminal, the first terminal starts the first timer at the first moment. The first time is the time when the first terminal successfully demodulates the physical side uplink control channel PSCCH scheduling signal in the activated state. The PSCCH scheduling signal may be used to schedule newly transmitted data for transmission on a sidelink between the first terminal and the second terminal, where the first terminal will listen for newly transmitted traffic data from the second terminal during the first timer period. For example, the first timer is drx-InactivityTimerSL.

In a possible implementation manner, the method provided in the embodiment of the present application further includes: and when the second timer times out, the first terminal starts the first timer, monitors the retransmission data of the service data during the running period of the first timer, wherein the first time is the time for starting the first timer, and the second timer represents the minimum waiting time before the first terminal starts to receive the retransmission data of the service data. At this point, the first terminal will keep listening for the retransmitted traffic data from the second terminal during the first timer run. For example, the first timer is drx-retransmission timersl.

Starting the first timer in the above-mentioned scheme means that the range of the sidelink resource information provided by the first terminal to the second terminal by using the first information is extended, and the range of the sidelink resource for the first terminal to receive the service data from the second terminal is also extended.

In a possible implementation manner, the method provided in the embodiment of the present application further includes: and in the running process of any timer corresponding to the activated state, if the PSCCH scheduling signal is not successfully demodulated, the first terminal starts a second timer. The PSCCH may schedule retransmission data for transmission on a side link between the first terminal and the second terminal.

In a possible implementation manner, the method provided in the embodiment of the present application further includes: under the condition that the first terminal is in an activated state, if the first terminal receives a sidelink discontinuous reception command MAC CE, the first terminal stops sensing sidelink resources. Or, in a possible implementation manner, the method provided in the embodiment of the present application further includes: and the first terminal does not receive the PSCCH scheduling signal for scheduling the service data in the activation period or before the first timer is overtime, and the first terminal stops sensing the side link resources.

In a possible implementation manner, the method provided in the embodiment of the present application further includes: under the condition that the first terminal is in an activated state, the first terminal stops perceiving the sidelink resources at the moment when the first terminal receives the sidelink discontinuous reception command MAC CE.

In a possible implementation manner, the method provided in the embodiment of the present application further includes: the first terminal does not receive the PSCCH scheduling signal for scheduling the service data in the activation period or before the first timer is overtime, and the first terminal stops sensing the side link resources when the activation period is ended or the first timer is overtime.

In a possible implementation manner, the method provided in the embodiment of the present application further includes: and during the running period of the first timer when the third timer is overtime, if the first terminal does not receive the PSCCH scheduling signal for continuously scheduling the service data, the first terminal stops sensing the side link resources when the first timer is overtime. Or, during the operation of the first timer, the first terminal receives the sidelink discontinuous reception command MAC CE, and then the first terminal stops sensing sidelink resources.

In one possible implementation, the stopping sensing of sidelink resources by the first terminal includes: and the MAC layer sends a sensing stopping instruction to the PHY, and the PHY stops sensing the side link resources according to the sensing stopping instruction. Or, in a possible implementation manner, the stopping sensing of the sidelink resource by the first terminal includes: the PHY automatically stops perceiving the sidelink resources.

In a possible implementation manner, the sending, by the first terminal, the first information to the second terminal includes: the first terminal sends first information to the second terminal before the first timer expires and before the sidelink resource fails. The effectiveness of the sidelink resources is guaranteed.

In a possible implementation manner, the quality of the sidelink resource is greater than or equal to a preset threshold, or the sidelink resource is determined by the channel busy rate CBR of the candidate sidelink resource, and/or the sidelink resource is determined by the resource quantity for sending the first information.

In a possible implementation manner, the method provided in the embodiment of the present application may further include: the first terminal receives traffic data from the second terminal on the target sidelink resource. The target sidelink resource belongs to a sidelink resource indicated by the first terminal to the second terminal by using the first information.

In a second aspect, an embodiment of the present application provides a method for determining a sidelink resource, where the method includes: the second terminal receives information from the first terminal, the first information indicating sidelink resources. And the second terminal selects a target sidelink resource from the sidelink resources to transmit the service data.

In a third aspect, an embodiment of the present application provides a communication apparatus, which may implement the method in the first aspect or any possible implementation manner of the first aspect, and therefore may also implement the beneficial effects in the first aspect or any possible implementation manner of the first aspect. The communication device may be the first terminal, or may be a device that supports the first terminal to implement the method in the first aspect or any possible implementation manner of the first aspect, for example, a chip applied in the first terminal. The communication device may implement the above method by software, hardware, or by executing corresponding software by hardware. An example, an embodiment of the present application provides a communication apparatus, including:

an example, the communication device is a first terminal or a chip system applied in the first terminal, the first terminal has an active state and a sleep state, the communication device includes: and the processing unit is used for sensing the side link resources. The processing unit is used for determining information of candidate sidelink resources in a first time period, and the first terminal is in an activated state in the first time period. And a communication unit, configured to send first information to the second terminal, where the first information is information indicating a sidelink resource, and the sidelink resource is all or part of the candidate sidelink resources.

In one possible implementation manner, taking the example that the first terminal includes a MAC layer and a PHY layer, the processing unit is configured to sense a sidelink resource, and includes: the MAC layer transmits a sensing indication and information used for indicating a first time period to the PHY, wherein the sensing indication is used for informing the PHY of sensing the side link resource. A processing unit, configured to determine information of candidate sidelink resources located in a first time period, including: and the PHY determines the information of the candidate side link resources in the first time period from the perceived side link resources, and reports the information of the candidate side link resources to the MAC layer.

In a possible implementation manner, the communication unit is configured to send the first information to the second terminal at the second time. The second time is within the sleep period, and the second time is before the first time period.

In a possible implementation manner, in the running process of any timer corresponding to the first terminal in the active state, the processing unit is configured to start the first timer at a first time. The first time is the time when the first terminal successfully demodulates the physical side uplink control channel PSCCH scheduling signal in the activated state.

In a possible implementation manner, when the second timer times out, the processing unit is configured to start the first timer, and the first terminal monitors retransmission data of the service data during a running period of the first timer, where the first time is a time when the first timer is started, and the second timer indicates a minimum waiting time before the first terminal starts to receive the retransmission data of the service data. At this point, the first terminal will keep listening for the retransmitted traffic data from the second terminal during the first timer run. For example, the first timer is drx-retransmission timersl.

In a possible implementation manner, in the operation process of any one of the timers corresponding to the active state, if the PSCCH scheduling signal is not successfully demodulated, the processing unit is configured to start the second timer. The PSCCH may schedule retransmission data for transmission on a side link between the first terminal and the second terminal.

In a possible implementation manner, the method provided in the embodiment of the present application further includes: and under the condition that the first terminal is in an activated state, if the communication unit receives the side link discontinuous reception command MAC CE, the processing unit is used for stopping sensing the side link resources. Or, in a possible implementation manner, the communication unit does not receive a PSCCH scheduling signal for scheduling traffic data during an active period or before a timeout of the first timer, and the processing unit is configured to stop sensing sidelink resources.

In a possible implementation manner, the processing unit is configured to stop sensing the sidelink resources at a time when the communication unit receives the sidelink discontinuous reception command MAC CE while the first terminal is in the active state.

In a possible implementation manner, the communication unit does not receive the PSCCH scheduling signal for scheduling traffic data during the active period or before the first timer times out, and the processing unit is configured to stop sensing the sidelink resources at the end of the active period or when the first timer times out.

In a possible implementation manner, during the time that the third timer is overtime and the first timer is running, if the communication unit does not receive the PSCCH scheduling signal for continuously scheduling the traffic data, the processing unit is configured to stop sensing the sidelink resource when the first timer is overtime. Or, during the operation of the first timer, when the communication unit receives the sidelink discontinuous reception command MAC CE, the processing unit is configured to stop sensing sidelink resources.

In one possible implementation, a processing unit configured to stop sensing sidelink resources includes: the processing unit sends a sensing stopping instruction to the processing unit through the PHY of the first terminal through the MAC layer, and the PHY of the first terminal stops sensing side uplink resources according to the sensing stopping instruction. Alternatively, in a possible implementation manner, the processing unit, configured to stop sensing sidelink resources, includes: the processing unit automatically stops sensing the sidelink resources through the PHY of the first terminal.

In a possible implementation manner, the communication unit is configured to send the first information to the second terminal before the first timer expires and before the sidelink resource fails. The effectiveness of the sidelink resources is guaranteed.

In a possible implementation, the communication unit is further configured to receive traffic data from the second terminal on the target sidelink resource. The target sidelink resource belongs to a sidelink resource indicated by the first terminal to the second terminal by using the first information.

Illustratively, when the communication device is a chip or a system of chips within the first terminal, the processing unit may be a processor and the communication unit may be a communication interface. For example, the communication interface may be an input/output interface, a pin or a circuit, etc. The processing unit executes the instructions stored by the storage unit to cause the first terminal to implement the method for determining sidelink resources described in the first aspect or any one of the possible implementations of the first aspect. The memory unit may be a memory unit (e.g., a register, a buffer, etc.) within the chip, or a memory unit (e.g., a read-only memory, a random access memory, etc.) within the first terminal that is external to the chip.

In a fourth aspect, embodiments of the present application provide a communication apparatus, which may implement the method in the second aspect or any possible implementation manner of the second aspect, and therefore may also achieve the beneficial effects in the second aspect or any possible implementation manner of the second aspect. The communication device may be a second terminal, or may be a device that supports the second terminal to implement the second aspect or the method in any possible implementation manner of the second aspect, for example, a chip applied in the second terminal. The communication device may implement the above method by software, hardware, or by executing corresponding software by hardware.

An example, an embodiment of the present application provides a communication apparatus, including: a communication unit configured to receive information from a first terminal, the first information indicating a sidelink resource. And the communication unit is used for selecting a target sidelink resource from the sidelink resources to transmit the service data.

Illustratively, when the communication device is a chip or a system of chips within the second terminal, the processing unit may be a processor and the communication unit may be a communication interface. For example, the communication interface may be an input/output interface, a pin or a circuit, etc. The processing unit executes the instructions stored by the storage unit to cause the second terminal to implement the method for determining sidelink resources described in the second aspect or any one of the possible implementations of the second aspect. The memory unit may be a memory unit (e.g., register, cache, etc.) within the chip, or may be a memory unit (e.g., read only memory, random access memory, etc.) within the second terminal that is external to the chip.

In a fifth 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 method for determining sidelink resources 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 method for determining sidelink resources as described in any one of the possible implementation manners of the second aspect to the second aspect. The computer may be a second terminal.

In a seventh aspect, embodiments of the present application provide a computer program product including instructions that, when executed on a computer, cause the computer to perform a method for determining sidelink resources as described in the first aspect or in various possible implementations of the first aspect.

In an eighth 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 method of determining sidelink resources as described in the second aspect or in various possible implementations of the second aspect.

In a ninth aspect, embodiments of the present application provide a communication device for implementing various methods in various possible designs of any one of the first to second aspects described above. 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. Alternatively, the communication device may be the second terminal, or a device including the second terminal, or the communication device may be a component (e.g., a chip) applied in the second 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. It should be understood that the communication apparatus described in the above ninth aspect may further include: a bus and a memory for storing code and data. Optionally, the at least one processor communication interface and the memory are coupled to each other.

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

In an eleventh aspect, an embodiment of the present application provides a communication apparatus, including: at least one processor. Wherein at least one processor is coupled to a memory, the 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 second aspect or any of the second aspects as described above. For example, the communication device may be the second terminal, or a chip applied in the second terminal. It should be understood that the memory described in any one of the tenth aspect to the eleventh aspect may be replaced by a storage medium, and the embodiment of the present application is not limited thereto.

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

In a twelfth aspect, the present embodiments provide a communication apparatus, where the communication apparatus includes one or more modules, configured to implement the method of any one of the first and second aspects, where the one or more modules may correspond to respective steps in the method of any one of the first and second aspects.

In a thirteenth aspect, an embodiment of the present application provides a chip system, where the chip system 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 first aspect and any possible implementation manner thereof. Alternatively, the chip system 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 fourteenth aspect, an embodiment of the present application provides a chip system, where the chip system 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 second aspect and any possible implementation manner thereof. Alternatively, the chip system 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 fifteenth 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 perform the method of the second aspect and any possible implementation manner thereof.

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

Drawings

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

fig. 2 is a block diagram of a communication device according to an embodiment of the present disclosure;

FIG. 3 is a schematic diagram of resource awareness provided in an embodiment of the present application;

fig. 4 is a schematic diagram of a resource distribution according to an embodiment of the present application;

fig. 5a is a schematic diagram of a DRX cycle according to an embodiment of the present disclosure;

fig. 5b is a schematic time domain position diagram of a sidelink resource selected by a terminal according to the embodiment of the present application;

fig. 6 and fig. 7 are schematic flowcharts illustrating a method for determining sidelink resources according to an embodiment of the present disclosure;

fig. 8 to fig. 11 are schematic diagrams illustrating that a receiving side terminal determines sidelink resources under different conditions according to an embodiment of the present application;

fig. 12 is a schematic structural diagram of a communication device according to an embodiment of the present application;

fig. 13 is a schematic structural diagram of a chip according to an embodiment of the present application.

Detailed Description

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.

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, a 5G communication system, a vehicle networking 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. In the embodiment of the present application, the method provided is applied to an NR system or a 5G network as an example.

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. Mapping, association, herein may have the same meaning.

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: and resources used when the terminal transmits side link service data (including data packets and control signaling) on the side link. The sidelink service data in the embodiment of the present application may also be referred to simply as: traffic data or V2X traffic.

3) A schematic diagram of a Discontinuous Reception (DRX) mechanism is shown in fig. 5a, and time is divided into continuous DRX cycles in a time domain. The DRX cycle includes an active period (timed with the DRX-onduration timer) and a sleep period. In the active period, the terminal device listens to a Physical Downlink Control Channel (PDCCH). In the dormant period, the terminal does not listen and receive the downlink signal so as to save power consumption.

4) The active period refers to the time when DRX-duration timer runs when a DRX cycle defined in the standard starts, and the terminal is in an active state in the active period.

5) The dormant period refers to the time after expiration of a DRX-duration timer in one DRX cycle defined in the standard, and the terminal is in a dormant state in the dormant period.

6) The active state refers to a state in which the terminal can listen to service data, that is, a state when receiving data, and is a variable concept. The terminal needs to detect the PDCCH in the active state.

Wherein the activation state of a terminal comprises the activation state of the terminal in an activation period. Or the activation state of a terminal comprises the activation state of the terminal in the activation period and the activation state in the time corresponding to the timing of other timers for maintaining the activation state.

It should be noted that, if no other timer for maintaining the active state is started, the active state is the state of the terminal during the active period. The dormant state is the state of the terminal in the dormant period.

If the terminal has other timers for maintaining the activated state to be started, the activated state of the terminal not only comprises the activated state of the terminal in the activated period, but also comprises the activated state of the terminal in the time corresponding to the timing of the other timers for maintaining the activated state.

7) The terminal cannot monitor service data (may monitor other data, such as sensing sidelink resources in the dormant state in the present application), and does not perform PDCCH or PSCCH detection in the dormant state to save power.

The sleep state is the state of the terminal during the sleep period minus the duration of the other timers maintaining the active state.

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 car 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 sent through network equipment, and the car networking system adopts a mode of direct terminal-to-terminal communication.

Based on the above description, fig. 1 shows a schematic structural diagram of a communication system (which may also be referred to as a V2V communication system) provided in the embodiments of the present application. The communication system includes: a terminal 10, and a terminal 20. It should be understood that 1 terminal 10 is shown in fig. 1, as well as terminal 20.

Among other things, the terminal 10 and the terminal 20 have a first interface for direct communication, which may be referred to as a PC5 interface. The transmission link over the PC5 interface for terminal 10 and terminal 20 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 10 and the terminal 20 may communicate on a sidelink between the terminal 10 and the terminal 20 through a resource. In the embodiment of the present application, a scenario in which the terminal 10 and the terminal 20 communicate on the sidelink may be referred to as: in the sidelink communication scenario, as an example, resources used by the terminal 10 and the terminal 20 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.

Taking the example where the terminal 10 transmits the sidelink traffic data to the terminal 20 using the sidelink resource, the terminal 10 may currently acquire the sidelink resource in the following manner. The manner in which the terminal 20 acquires the sidelink resource may refer to the manner in which the terminal 10 acquires the sidelink resource, and will not be described in detail later.

Mode 1(mode1), resource allocation pattern for network scheduling.

mode 1: the terminal 10 performs data transmission with a network device in a Radio Resource Control (RRC) connected state, and then the network device communicating with the terminal 10 may schedule a sidelink resource for the terminal 10 to transmit sidelink traffic data. For example, the terminal 10 transmits a Scheduling Request (SR) and a sidelink Buffer Status Report (BSR) to the network device. The sidelink BSR is used for determining the size of the sidelink communication data volume of the terminal 10. Based on the sidelink BSR, the network device may determine the size of the sidelink communication data amount of the terminal 10, and schedule, for the terminal 10, 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.

Mode 2(mode2), resource selection mode autonomously selected by the terminal.

mode2, the terminal 10 selects a sidelink resource from a pool of resources (typically including one or more sidelink resources). This resource pool is broadcast by the network devices in the system information, for example, when the terminal 10 is within network coverage. The resource pool may be a pre-configured resource pool for the terminal 10 when the terminal 10 is out of network coverage. The resource pool may be a specific resource pool for the terminal 10, i.e. only the terminal 10 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 10, that is, other terminals except the terminal 10 may also select sidelink resources in the resource pool. For the latter, then when the terminal 10 autonomously selects a sidelink resource in the resource pool, the terminal 10 may perform sensing on the resource pool to select the sidelink resource.

sidelink transmissions are based on resource pools. A resource pool is a logical concept, and a resource pool includes a plurality of physical resources, where any one of the physical resources is used for transmitting service data. When one terminal transmits service data to another terminal, sidelink resources can be selected from the resource pool for transmission.

Specifically, in order to ensure the quality of sidelink resources used by the service data sent by the terminal 10, when the terminal 10 autonomously selects sidelink resources, resource collision caused by a plurality of terminals randomly selecting sidelink resources in a resource pool is avoided, that is, the sidelink resources selected by the terminal 10 are prevented from being occupied by other terminals, so as to reduce communication quality. The terminal 10 may predict the occupation of the sidelink resource in a certain time period 1 in the future in a perceptual manner, and use the occupation of the sidelink resource in the certain time period 1 as a perceptual result. The time period 1 may be a time period during which the terminal 10 has service data to transmit. The occupation of the side link resources may be: whether other terminals occupy sidelink resources in this time period 1 in the future. Therefore, based on the sensing result, the terminal 10 may reserve the sidelink resource corresponding to the sensing result, and ensure the communication quality of itself. In addition, the terminal 10 may determine the resource pool configuration based on the network device by sensing that the reserved sidelink resources are time-efficient, for example, in 5G NR, the sensing result of the periodic traffic and the sensing result of the aperiodic traffic are different in time efficiency, and are both within a certain millisecond time.

In LTE or NR based V2X communication, the terminal 10 may use or obtain the sensing result based on the sensing procedure defined in the LTE Release (Release)14 standard protocol. Illustratively, the perceived 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, a Channel Busy Ratio (CBR) of the sidelink resource.

As shown in fig. 1, fig. 1 illustrates a scenario provided by an embodiment of the present application, as shown in fig. 1, taking a terminal 10 as a vehicle identified as X (abbreviated as vehicle X), if the vehicle X decides to perform a cut-in operation, the vehicle X may send service data (e.g., the service data may be a cut-in instruction, a current vehicle speed of the vehicle X (e.g., 75km/h)) in a dialog box 30 to a terminal 20 (e.g., a vehicle identified as Y (abbreviated as vehicle Y)) located in front of the vehicle X on a sidelink resource, so that the vehicle Y decelerates to drive after receiving the current vehicle speed of X and the cut-in instruction, so that the X safely cuts in. Before the terminal 10 transmits the traffic data to the terminal 20, the terminal 10 may select a sidelink resource from a transmission resource pool.

Based on this, when the terminal 10 transmits the service data to the terminal 20, the terminal 20 may send the receiving resource (i.e., sidelink resource for receiving the service data of another terminal) in the receiving resource pool (i.e., the above-mentioned transmitting resource pool), and transmit the information of the receiving resource with better communication quality in the receiving resource pool as the auxiliary information to the terminal 10 through the auxiliary information, so that the terminal 10 may consider the information of the receiving resource transmitted by the terminal 20 when performing resource selection, thereby improving the receiving quality of the service data received by the terminal 10 from the terminal 20.

It should be noted that, in the embodiment of the present application, the sidelink resources included in the sending resource pool and the receiving resource pool may be partially the same or all the same. The transmit resource pool and the receive resource pool are relative concepts, and if the terminal 10 selects a sidelink resource in the resource pool 1 for transmitting traffic data to the terminal 20, the resource pool 1 is a transmit resource pool for the terminal 10 and a receive resource pool for the terminal 20. In addition, since the terminal 20 itself may also have a requirement for transmitting service data, the receiving resource pool is mainly distinguished from the "resource pool used when the terminal 20 is used as a data transmitting end", and the receiving resource pool of the terminal 20 is the transmitting resource pool of the terminal 10.

The scenario shown in fig. 1 is merely an example, and other scenarios of communication between terminals are also applicable to the present application.

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.

A network device is an entity that can be used in conjunction with a terminal to transmit or receive signals. For example, the Access Point (AP) in the WLAN may be an evolved node b (eNB or eNodeB) in Long Term Evolution (LTE), or a relay station or an access point, or a vehicle-mounted device, a wearable device, and a network device in a fifth Generation mobile communication technology (5th Generation mobile networks or 5th Generation wireless systems, 5th-Generation, abbreviated as: 5G) network (which may also be referred to as New Radio (NR)) or a network device in a PLMN network in future evolution, and the like. The network device in the embodiment of the present application may be a base station. As an example, the network device may be an evolved node b (eNB or eNodeB) in the 4Generation mobile communication technology (4G) system. Terminal 200 is a terminal capable of transmitting information to an eNB. As another example, the network device may be a next generation nodeb (gNB) in the NR system, and the terminal 10 or the terminal 20 may be a terminal capable of transmitting information with the gNB.

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.

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. Processor 21 is operative to execute computer-executable instructions stored in memory 22 to implement the method for determining sidelink resources provided by the embodiments described below in 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).

Based on the above description of sensing, in a sidelink transceiving scenario of actual mode2 resource allocation, taking terminal 10 as a transmitting terminal (Tx UE) and terminal 20 as a receiving terminal (Rx UE) as an example, communication is performed between terminal 10 and terminal 20 through sidelink, and before terminal 10 transmits traffic data to terminal 20, terminal 10 may reserve sidelink resources from a resource pool through sensing. Since the sidelink resource is sensed by the terminal 10 in the resource pool by itself, and the available sidelink resource is selected based on the sensing result of the terminal 10 to the resource pool, the selected sidelink resource is prevented from being occupied by other UEs, so that the terminal 10 can select the sidelink resource with better quality, thereby ensuring the communication quality of the service data transmitted from the terminal 10 to the terminal 20. In addition, the terminal 10 may determine the reserved sidelink resource according to the attribute of the service data (e.g., a periodic service or an aperiodic service) and the resource reservation aging corresponding to the service data, that is, the sidelink resource is located within the resource reservation aging corresponding to the service data, and the terminal 10 may not reserve resources located outside the resource reservation aging. For example, when the service data of the terminal 10 is a periodic service, the terminal 10 may reserve sidelink resources within the resource reservation aging time corresponding to the periodic service. When the service data of the Tx UE is aperiodic service, the Tx UE may reserve sidelink resources within the resource reservation time corresponding to the aperiodic service. For example, as shown in fig. 3, taking the resource reservation aging t < 100ms corresponding to the periodic service as an example, the terminal 10 may reserve sidelink resources within 100 ms. Taking the resource reservation aging t < 32ms corresponding to the aperiodic service as an example, the terminal 10 may reserve sidelink resources within 32 ms.

The resource reservation aging corresponding to the service data in the embodiment of the present application may refer to: the valid time range of the sidelink resource, i.e. in which time period the sidelink resource is valid and in which time period it is not valid. If the sidelink resource is valid during time period A or before time point A, the terminal 10 may transmit the traffic data using the sidelink during the time period A or before time point A. The sidelink resource is invalid for a period outside or after the period a, and the terminal 10 cannot transmit traffic data using the sidelink resource.

To further improve the communication quality of Rx UE receiving service data in mode2 resource allocation, for the sidelink communication scenario described above, the terminal 20 may also provide the terminal 10 with auxiliary information when the terminal 10 transmits service data to the terminal 20. Here, the terminal 20 provides the supplementary information because: the terminal 10 mainly performs the sidelink resource selection from its own perspective, without considering whether the sidelink resource selected by the terminal is also applicable to the terminal 20. Specifically, the terminal 10 is located at a different position than the terminal 20. However, the interference experienced by the terminal 10 and the terminal 20 on the same sidelink resource may be different due to different positions of the two terminals, for example, the CBR measured by the terminal 10 and the terminal 20 for the same channel may be different due to different positions of the terminal 10 and the terminal 20, that is, the communication quality of the two terminals on the same sidelink resource is different. For example, as shown in fig. 4, the terminal 10 and the terminal 20 perform sending on the same resource pool. In practical situations, time-frequency resource 1 in the resource pool is already occupied by terminal a, and time-frequency resource 2 is already occupied by terminal b. The terminal 20 is closer to the terminal a and the terminal b, and the terminal 20 can detect the signals transmitted by the terminal a and the terminal b, that is, for the terminal 20, the resource pool occupation condition is: both time frequency resource 1 and time frequency resource 2 are occupied. The distance between the terminal 10 and the terminal a is short, but the distance between the terminal 20 and the terminal b is long, so there may be the following cases: the terminal 10 can detect the signal transmitted by the terminal a, but not detect the signal transmitted by the terminal b, and at this time, for the terminal 10, the occupation situation of the resource pool is: the time frequency resource 1 is occupied. It can be seen that the communication quality of different terminals on the same resource may be different due to different positions of the terminal 10 and the terminal b. If the subsequent terminal 10 selects the time-frequency resource 2 as the sidelink resource to transmit the service data to the terminal 20, the quality of the service data received by the terminal 20 may be affected.

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, a discontinuous reception mechanism is applied to a Uu port (an 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. In the case that the network device does not transmit data to the terminal, if the terminal still maintains the listening state, it consumes power to the terminal. 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.

Specifically, when the terminal employs the DRX mechanism, the terminal is configured with a DRX cycle (cycle), which, as shown in fig. 5a, includes two periods: an active period (on duration) and a sleep period (opportunity for DRX) (which may also be referred to as an inactive period). In the on duration, the terminal monitors a Physical Downlink Control Channel (PDCCH), that is, a time period during which the terminal monitors the PDCCH is referred to as an active period. The terminal will turn on the receiver during the active period, which can be seen as a constant concept. In "opportunity for DRX", the terminal may send information (such as the first information in this application, or send traffic data to other terminals or to the base station) as well as sense sidelink resources and select sidelink resources, although not monitoring the PDCCH. When there is no data transmission, the terminal may turn off the receiver, thereby reducing power consumption of the terminal. As can be seen from fig. 5a, the longer the time for DRX sleep, the lower the power consumption of the terminal.

In addition, the active state includes a period of time during which the receiver should be turned on while the other DRX-related timers are in an active state. The other timer means that any one of a DRX duration timer (DRX-onduration timer), or a DRX inactivity timer (DRX-inactivity timer), or a DRX downlink retransmission timer (DRX-retransmission timer), or a DRX uplink retransmission timer (DRX-retransmission timer ul), or a random access contention resolution timer (ra-contentionresolution timer) is in an operating state. ra-ContentionResolutionTimer refers to a timer used by a terminal in a random access process, and is used for the terminal to wait for obtaining access resources of a base station). For example, the terminal is in an active state when a DRX duration timer, or a DRX inactivity timer, or a DRX downlink retransmission timer or a DRX uplink retransmission timer is running. That is, the terminal is in a DRX active time (active time) during the DRX duration timer, or the DRX inactivity timer, or the DRX downlink retransmission timer (DRX-retransmission timer dl) or the DRX uplink retransmission timer (DRX-retransmission timer ul) is running, in other words, the active time can also be regarded as the time when the terminal is in an active state, and the terminal needs to perform blind detection on the PDCCH in the active time.

In addition to the above description of the DRX cycle, 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 duration timer (DRX-onDurationTimer) is a DRX cycle start time, wherein the duration of an on duration may be considered as an active state (which may also be referred to as an awake state) of the terminal during the operation of the DRX-duration timer.

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

A DRX inactivity timer (DRX-inactivity timer) which is continuously in an active state for a time length 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 that 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 time period, so the terminal needs to remain in the active state to wait for receiving data.

DRX downlink retransmission timer (DRX-retransmission timer) (HARQ) process for each downlink hybrid automatic repeat request (HARQ) process except for 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 the uplink data in the drx-retransmission timerll operation for the maximum duration before the terminal receives the uplink retransmission resource of the Uu port.

DRX long cycle on offset (DRX-LongCycleStartOffset): indicating a Long DRX Cycle (Long DRX Cycle) specifying the number of subframes/ms occupied by the Long Cycle and a DRX-StartOffset (DRX-StartOffset) specifying the starting subframes of the Long DRX Cycle and the short DRX Cycle.

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

DRX short cycle timer (optional): the terminal is in the time length of the Short DRX period, and the unit is the number of Short DRX cycles.

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.

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-TimerUL of the terminal is over, the terminal can start uplink retransmission, and drx-retransmission TimerUL is started.

Therefore, when the terminal configures the DRX mechanism, the terminal being in the DRX active period (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 1, if only drx-onDurationTimer counts in the timer and other timers do not count, that is, the active state of the terminal in the embodiment of the present application may refer to the state of the terminal in the active period.

When drx-inactivytytimer, drx-retransmission timerdl, or drx-retransmission timerll operates, the activation state of the terminal may be considered to be extended, i.e., drx-inactivytimer, drx-retransmission timerdl, or drx-retransmission timerll is a timer for extending the activation state of other terminals. In this case, the active state of the terminal in the embodiment of the present application may refer to the state of the terminal during the active period and the running period of each timer.

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, in addition to the above cases, the activation period may also include other cases specified in future communication protocols, and this is not specifically limited in the embodiment of the present application.

When the current Tx UE and Rx UE perform the sidelink communication, 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 time period, and the Rx UE continuously maintains the active state and can receive scheduling data transmitted by the Tx UE. In some scenarios, such as a unicast scenario or a multicast scenario with feedback, the Rx UE may provide the auxiliary information for the resource selected by the Tx UE, and the sidelink resource indicated in the auxiliary information provided by the Rx UE may be in the whole time range, that is, the sensing range of the Rx UE is also in the whole time period, which is very power consuming for the Rx UE. Wherein, the unicast scene refers to: one Tx UE transmits traffic data to one Rx UE, but one Tx UE may simultaneously establish a sidelink connection with multiple Rx UEs. In a multicast scenario, a plurality of terminals form a group, the terminals in the group communicate with each other, and the terminals in the same group can receive all data or information in the group.

As described above, in the current sidelink communication, the Rx UE continuously detects the PSCCH (which may be the PSCCH corresponding to the traffic data sent by the Tx UE or the PSCCH detected by the Rx UE during sending of the reception resource pool for providing the auxiliary information), and even if there is no data sent by the Tx UE currently, the Rx UE does not need to receive the traffic data from the Tx UE, or the Rx UE does not need to provide the auxiliary information to the Tx UE, the Rx UE still keeps the continuous monitoring state, which consumes the power of the Rx UE very much.

Based on the above defects, in the embodiment of the present application, a DRX mechanism may be configured for Rx UE, so that Rx UE is in a sleep period when it is not needed to receive service data, thereby avoiding invalid PSCCH monitoring and reducing power consumption of Rx UE.

However, when the Rx UE configures the DRX mechanism, the Rx UE only receives traffic data from the Tx UE during the active period, and in order to ensure that the Rx UE can receive traffic data on the high-quality sidelink resource during the active period, the time-domain location of the receiving resource indicated in the auxiliary information provided by the Rx UE needs to be located within the time period when the terminal is in the active state. In other words, in order for the Rx UE to provide the auxiliary information to the Tx UE, the Rx UE does not need to continuously perceive within the whole time range, and since the time domain position of the sidelink resource indicated by the auxiliary information should be located within the time period when the Rx UE is in the active state, the resource perception range of the Rx UE for providing the auxiliary information should also be a certain range. In addition, since the sensing result is time-efficient, the Rx UE, after applying the DRX mechanism: how to start sensing can ensure that the time domain position of the sidelink resource indicated in the auxiliary information is within the time period when the Rx UE is in the active state is a technical problem that needs to be solved urgently.

For example, as shown in fig. 5b, Rx UE selects a sidelink resource 501 located in a resource sensing window from the sensed sidelink resources, but the sidelink resource 501 is located before time 1, where time 1 refers to the time when an activation period starts, that is, the sidelink resource 501 is located in a sleep period of Rx UE, and cannot receive traffic data from Tx UE, and thus the sidelink resource 501 is an invalid sensing result. For another example, Rx UE selects sidelink resources 502 located in the resource sensing window from the sensed sidelink resources, and sidelink resources 502 are located in the active period of Rx UE, i.e. sidelink resources 502 may be used as the resource for Rx UE to receive traffic data from Tx UE, so that sidelink resources 502 are the effective sensing result. As another example, as shown in fig. 5 b: the time period (i.e. the time period X1 in fig. 5 b) between the resource sensing window and the resource selection window of the Rx UE is opportunity for DRX, and the Rx UE is in the sleep period, and according to the DRX cycle that the Rx UE has configured, the Rx UE does not change from the sleep state to the active state to receive the traffic data in the sleep period, so that there is no need to provide the assistance information, and therefore the Rx UE may stop sensing the sidelink resources indicated by the assistance information.

The resource perception window in the embodiment of the present application refers to: and the time period for the receiver terminal or the sender terminal to sense the side link resources.

The resource selection window in the embodiment of the present application refers to: and the receiving terminal or the sending terminal selects resources for transmitting the service data or time periods for receiving the resources for the service data from the perceived sidelink resources.

Based on this, an embodiment of the present application provides a method for determining a sidelink resource, where when Rx UE has an active state and a dormant state, in order to avoid Rx UE providing a sidelink resource that does not belong to an active time range, in the scheme, Rx UE perceives the sidelink resource. The Rx UE determines information of candidate sidelink resources located within a first time period during which the Rx UE is in an active state. The Rx UE then provides the Tx UE with first information indicating information of sidelink resources, which are all or part of the candidate sidelink resources. Because the time domain position of the sidelink resource is located in the time period when the Rx UE is in the activated state, the Rx UE can be prevented from providing the sidelink resource which does not belong to the active time range, and the sidelink resource is the resource which is recommended by the Rx UE to the Tx UE and is used for sending the service data to the Rx UE, so that the data receiving quality of the Rx UE can be ensured. Further, the Rx UE has an active state and a dormant state, and the Rx UE does not need to monitor the PSCCH in the dormant state, so that the purpose of saving power for the Rx UE can be achieved.

Further, in order to reduce the time for the Rx UE to perform sending for providing the information of the sidelink resource, a Media Access Control (MAC) Layer of the Rx UE may notify a Physical Layer (PHY) to start sending and notify a valid sending result range (e.g., a first time period) corresponding to the current sending.

In the embodiment of the present application, for an Rx UE applying a DRX mechanism, the Rx UE has DRX parameters therein. In this embodiment of the present application, a manner for the Rx UE to acquire the DRX parameter is not limited, and as an example, the manner for the Rx UE to acquire the DRX parameter may include, but is not limited to, the following manners:

mode1, Tx UE configures DRX parameters for Rx UE. For example, the Tx UE actively configures DRX parameters for the Rx UE. For another example, the Tx UE may configure DRX parameters for the Rx UE based on a request of the Rx UE.

Mode2, the network device configures DRX parameters for Rx UE. For example, the network device actively configures DRX parameters for the Rx UE. For another example, the network device may configure the DRX parameters for the Rx UE based on a request of the Rx UE.

Mode 3, the Rx UE is preconfigured with DRX parameters.

Mode 4, the DRX parameter of the Rx UE is predefined by a standard protocol, i.e. the Rx UE is predefined in the standard protocol to have the DRX parameter.

Mode 5, the DRX parameter has a mapping relationship with the resource pool, and if the Rx UE can sense or select resources from the resource pool, the Rx UE has the DRX parameter.

Mode 6, the DRX parameter has a mapping relation with the traffic type, etc., for example, if the Rx UE needs to receive the traffic data of the traffic type, the Rx UE may use the DRX parameter.

Mode 7, Rx UE configures the DRX parameter.

After introducing the DRX mechanism for the Rx UE on sidelink, the meaning of the relevant DRX timer configured for the Rx UE may follow the meaning of Uu port:

a sidelink DRX duration timer (DRX-ondurationTimerSL), the duration of the beginning of the DRX cycle, where on duration. During on duration, the Rx UE is in an active state.

sidelink DRX slot offset (DRX-slotoffsetSL): the time delay before the DRX-onDurationTimer is turned on.

And a Sidelink DRX inactivity timer (DRX-inactivity timer SL) which is used for the time length of keeping in an active state after the Rx UE successfully decodes the PSCCH which is originally transmitted by the last Tx UE scheduling new data of the Sidelink. That is, after Rx UE is scheduled by Tx UE, the Rx UE should turn on the Drx-inactivity timer sl corresponding to the Tx UE to prolong the time that Rx UE is in active state, in other words, when the Sidelink Drx-inactivity timer starts running, the active state of Rx UE is prolonged or maintained, that is, the time that Rx UE is in active state is the duration of Sidelink Drx inactivity timer, and the corresponding scenario can be understood as that Rx UE is scheduled continuously in the next time period when it is currently scheduled, so Rx UE needs to keep in active state to wait for receiving data;

a sidelink DRX retransmission timer (DRX-retransmission TimerSL), the maximum duration until the Rx UE receives sidelink retransmission data from the Tx UE, in which DRX-retransmission TimerSL operation the Rx UE waits to receive retransmission data transmitted by the Tx UE on sidelink. In other words, the active state of the Rx UE is extended or maintained when the sidelink Drx-retransmission timer starts running.

A sidelink DRX retransmission timer (DRX-retransmission timer SLL), wherein the Rx UE receives a sidelink hybrid automatic retransmission request (HARQ) corresponding to the Tx UE to feed back the maximum duration before retransmitting a sidelink resource, namely the Tx UE receives an Acknowledgement (ACK) message/non-acknowledgement (NACK) message sent by the Rx UE to feed back the time length which needs to wait before feeding back the data, and the Rx UE carries out sidelink HARQ feedback in the DRX-retransmission timer SLL operation.

The sidelink DRX Long Cycle on offset (DRX-longcyclestartOffsetSL) represents both Long DRX Cycle and DRX-StartOffsetSL. Where Long DRX Cycle specifies the number of subframes/ms occupied by the Long Cycle. DRX-StartOffseSLt specifies the starting sub-frame for long and short DRX cycles;

sidelink DRX short cycle (DRX-ShortCycleSL) (optional): short DRX cycle is the time length of a Short DRX cycle, and the unit is subframe/millisecond;

a sidelink DRX Short cycle timer (DRX-shortcycleTimeSL (optional): the time length of the Rx UE in the Short DRX cycle, and the unit is the number of Short DRX cycles;

drx-HARQ-RTT-TimerSL the duration of time before Rx UE expects to receive sidelink HARQ retransmission data for Tx UE on sidelink. The drx-HARQ-RTT-TimerSL may be understood as a time window, in which the Tx UE does not retransmit the service data that is currently failed to be transmitted, and the Rx UE may continue to receive the retransmitted data of the service data only after the drx-HARQ-RTT-TimerSL is timed out. When drx-HARQ-RTT-TimerSL of the Rx UE is timed out, the Rx UE can start to receive retransmission data aiming at the service data from the Tx UE, and then drx-retransmission TimerDL is started.

drx-HARQ-RTT-TimerSLL the duration of time before Rx UE expects to receive sidelink HARQ retransmission resources on sidelink can be understood as a time window. The Rx UE may not feed back the service data that is failed to be currently transmitted within the time window, and needs to wait for the drx-HARQ-RTT-TimerSLL to time out, and then feeds back the service data sent by the Tx UE. That is, the Rx UE starts to transmit ACK/NACK feedback after the duration of the time window of the parameter from the previous transmission of Acknowledgement (ACK)/Negative Acknowledgement (NACK) feedback, which is a limit to the ACK/NACK feedback, and thus the Rx UE is prevented from always transmitting feedback data.

Therefore, when the Rx UE configures the DRX mechanism, the Rx UE is in a DRX active period (active time) mainly includes the following cases:

any one of the timer run periods of drx-onDurationTimerSL or drx-inactivyttimersl or drx-retransmission timersl or drx-retransmission timersll or ra-contentresultivation timer. Wherein, the ra-ContentionResolutionTimer is a timer used by the Rx UE in the random access procedure, and is used for the Rx UE to wait to obtain the access resource of the network device, but there may be no random access procedure on the sidelink.

The Rx UE 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 Rx UE preparing but not sending the SR to the network device.

Similar to ra-ContentionResolutionTimer, Rx UE successfully receives RAR for preamble in response to contention-based random access selected by non-Rx UE, but does not receive PDCCH indicating initial transmission scrambled with C-RNTI.

However, since the Rx UE configures the DRX mechanism, the Rx UE does not continuously maintain the active state, and therefore the first information provided by the Rx UE for assisting the Tx UE in resource selection is time domain required.

A method for determining sidelink resources according to an embodiment of the present application will be described in detail with reference to fig. 6 to 10.

It should be noted that, in the following embodiments of the present application, names of messages between network elements or names of parameters in messages are only an example, and other names may also be used in a specific implementation, which is not specifically limited in this embodiment of the present application.

It should be noted that the embodiments of the present application may refer to or refer to each other, for example, the same or similar steps, method embodiments, communication system embodiments and apparatus embodiments may refer to each other, and are not limited.

The following describes the technical solution provided by the embodiment in detail by taking the first terminal as a receiver terminal and the second terminal as a sender terminal. It should be understood that, in the embodiment of the present application, a specific structure of an execution subject of a method for determining a sidelink resource is not particularly limited in the embodiment of the present application, as long as communication can be performed by a method for determining a sidelink resource according to the embodiment of the present application by running a program recorded with a code of a method for determining a sidelink resource of the embodiment of the present application. For example, an execution subject of the method for determining a sidelink resource provided by the embodiment of the present application may be a functional module capable of calling a program and executing the program in a receiving terminal, or a communication device applied in the receiving terminal, such as a chip, a system on a chip, an integrated circuit, and the like. The chip, the chip system, and the integrated circuit may be disposed inside the terminal of the receiving party, or may be independent from the terminal of the receiving party, which is not limited in the embodiments of the present application. An execution main body of the method for determining a sidelink resource provided in the embodiment of the present application may be a functional module capable of calling a program and executing the program in a sender terminal, or a communication device applied in the sender terminal, for example, a chip system, an integrated circuit, and the like, where the chip, the chip system, and the integrated circuit may be disposed inside the sender terminal, or may be independent from the sender terminal, and the embodiment of the present application is not limited.

As shown in fig. 6, fig. 6 shows an interactive embodiment of a method for determining sidelink resources provided by the embodiment of the present application, where the method includes:

step 601, the receiving terminal senses the side link resource.

The receiving terminal in the embodiment of the present application refers to a terminal capable of receiving the service data sent by the sending terminal, and of course, the receiving terminal may also send the service data in addition to receiving the service data. The terminal of the sending party refers to a terminal capable of sending the service data, and of course, the terminal of the sending party can also receive the service data sent by other terminals besides sending the service data. The sender terminal and the receiver terminal are relative concepts.

Referring to fig. 1, the receiving terminal may be a terminal 20, and the transmitting terminal may be a terminal 10.

It can be understood that, in the embodiment of the present application, the receiver terminal and the sender terminal are capable of performing sidelink communication, and the receiver terminal adopts a power saving mode, that is, the receiver terminal includes an active period and a sleep period in one cycle.

For example, the receiving terminal may adopt a discontinuous reception mechanism, so that the receiving terminal is in a power saving mode, which is not limited in this embodiment of the present application. The concept of the discontinuous reception mechanism refers to the above description, and the embodiment of the present application does not limit this.

In the embodiment of the application, the receiving terminal can receive the retransmission data or the newly transmitted data from the second terminal in the activated state.

In the embodiment of the present application, although the terminal of the receiving party cannot receive the service data in the dormant state, the terminal of the receiving party may send data or signaling, for example, send the first information.

The receiving terminal in the embodiment of the application can sense the sidelink resource in the receiving resource pool. The so-called reception resource pool refers to: the receiving terminal is capable of receiving a resource pool of traffic data (e.g., retransmitted data or newly transmitted data). The resource pool is for a sender terminal, and the sender terminal can select resources from the receiving resource pool to send service data. In other words, the resource pool is a reception resource pool for the receiver terminal and a transmission resource pool for the sender terminal.

Newly transmitted data is data transmitted from a sender terminal or other terminals to a receiver terminal for the first time (the first time). The retransmission data is data transmitted from the terminal of the sender or other terminals to the terminal of the receiver M times. In other words, the retransmission data is the data that is not transmitted to the receiving terminal by the transmitting terminal or other terminals for the first time. M is an integer greater than or equal to 2, and M is less than or equal to the maximum retransmission times of the data transmitted by the terminal of the transmitting side.

Step 602, the receiving terminal determines the information of the candidate sidelink resource in the first time period, and the receiving terminal is in the activated state in the first time period.

It can be understood that the candidate sidelink resources are all or part of sidelink resources in all the sidelink resources perceived by the receiving terminal. The number of candidate sidelink resources in the embodiment of the application is one or more.

Step 603, the receiving terminal sends the first information (for example, the auxiliary information) to the sending terminal, and correspondingly, the sending terminal receives the first information from the receiving terminal. The first information is information indicating a sidelink resource. The sidelink resources are all or part of sidelink resources in the candidate sidelink.

The number of sidelink resources in the embodiment of the present application may be one or more.

Illustratively, the first information includes information of sidelink resources. For example, the sidelink resources may be time-frequency resources. Then, the information of the sidelink resource may include a subchannel (subchannel) number, a subframe (subframe) number, or a slot (slot), etc.

Of course, the information of the sidelink resource may also include: the priority of the sidelink resource and the measurement result of the channel busy rate of the sidelink resource.

As a possible implementation manner, step 603 in the embodiment of the present application may be implemented by: the receiving terminal sends a first message including the first information to the sending terminal, and correspondingly, the sending terminal receives the first message from the receiving terminal.

For example, the first message may be an RRC message, a MAC control element (MAC CE), Sidelink Control Information (SCI), or the like. For example, the first message includes a first field and a second field, where the first field is used to indicate time domain information of the sidelink resource, the second field is used to indicate frequency domain information of the sidelink resource, where the time domain information may include a subframe number and/or a slot, and the frequency domain information may include a subframe number, in other words, the first information is the first field and the second field. As another example, the first message includes a field that may directly indicate sidelink resources.

In the above scheme in this embodiment of the application, the sidelink resource provided by the receiver terminal to the sender terminal is located in the first time period, and because the receiver terminal is in the activated state in the first time period, the sidelink resource provided by the receiver terminal to the sender terminal by using the first information is located in the time period corresponding to the activated state of the receiver terminal, so that it is avoided that when the receiver terminal has both the dormant state and the activated state, the receiver terminal provides, to the sender terminal, information of the sidelink resource that does not belong to the active time range corresponding to the activated state of the receiver terminal by using the first information. In addition, the sidelink resource is provided by the receiving terminal to the sending terminal, and the receiving terminal can fully consider the quality of data received in the sidelink resource when providing the sidelink resource, so that the data from the sending terminal is received in the sidelink resource subsequently, and the communication quality of the receiving terminal can be improved. Moreover, in the scheme, the effect of saving power for the terminal of the receiving party can be achieved because the terminal of the receiving party has both the dormant state and the activated state.

As a possible embodiment, the method provided in this embodiment of the present application may further include, after step 603: and the sender terminal selects the target sidelink resources from the sidelink resources according to the first information. And correspondingly, the receiving terminal receives the service data from the sending terminal.

The selection of the target sidelink resource from the sidelink resources according to the first information by the sender terminal can be realized by the following steps: and the sender terminal determines the sidelink resources indicated by the first information according to the first information. And then the terminal of the sender selects the target side link resource according to the priority or the signal quality or the CBR or the time domain position of the side link resource. Taking the example that the sidelink resources include sidelink resource 1 and sidelink resource 2, if the priority of the sidelink resource 1 is higher than the priority of the sidelink resource 2, or if the signal quality of the sidelink resource 1 is higher than the signal quality of the sidelink resource 2, or if the time domain position of the sidelink resource 1 is before the time domain position of the sidelink resource 2, the sending terminal takes the sidelink resource 1 as the target sidelink resource, and then sends the service data to the sending terminal by using the sidelink resource 1. Of course, if the time interval between the time of the service data that the sender terminal needs to send and the time domain position of the sidelink resource 1 is smaller than the time interval between the time domain position of the sidelink resource 2, the sender terminal can ensure that the service data is sent to the receiver terminal as soon as possible by selecting the sidelink resource 1 to send the service data.

As a possible embodiment, as shown in fig. 7, when the receiving terminal includes a MAC layer and a PHY, step 601 in this embodiment may be implemented by step 701, and step 602 may be implemented by step 702.

Step 701, the MAC layer sends the sensing indication and the information indicating the first time period to the PHY, and accordingly, the PHY receives the sensing indication and the information indicating the first time period from the MAC layer.

Wherein the sensing indication is used to inform the PHY of sensing sidelink resources.

In this embodiment of the present application, the sensing instruction is used to notify the PHY to sense the sidelink resource immediately after receiving the sensing instruction, or the sensing instruction is used to notify the PHY to start sensing the sidelink resource at a specified time after receiving the sensing instruction, which is not limited in this embodiment of the present application.

In a possible embodiment, the sensing indication in step 701 of the embodiment of the present application may be omitted, that is, if the MAC layer sends the information indicating the first time period to the PHY, the PHY senses the sidelink resources through the information indicating the first time period implicitly, so that after the PHY receives the information indicating the first time period, the PHY may determine the sensing sidelink resources.

As an example, the inter-layer interaction between the MAC layer and the PHY of the receiving terminal may be implemented as follows: for example, the MAC layer of the receiving terminal transmits a notification to the PHY, and accordingly, the PHY receives the notification transmitted by the MAC layer. The notification includes a perception indication and information indicating the first time period.

For example, the information indicating the first period may be a start time (which may also be referred to as a start time or a start time) of the first period and an end time (which may also be referred to as an end time or an end time) of the first period. The starting time of the first time period may be an absolute time or a time interval from a current time. For example, the first period is from the first symbol in slot 1 to the last symbol in slot 1, and the information indicating the first period may be the first symbol in slot 1 and the last symbol in slot 1. For another example, the information indicating the first period of time may be a start time of the first period of time, and a duration of the first period of time. For example, the information indicating the first time period may be the first symbol in the time slot 1 and have a length of 14 symbols, and here, for example, a time slot includes 14 symbols.

For example, the starting time of the first time period may be embodied by the current time and the time interval, for example, if the current time is t0, then the MAC entity sends the time interval Δ t to the physical layer, and then the physical layer may determine t0+ Δ t as the starting time of the first time period. The physical layer may take the time at which the notification was received as the current time. As another example, the first time period may be implemented by a subframe number offset value in the system frame.

As a possible embodiment, before step 701, the method in the embodiment of the present application may further include: and after the MAC layer of the receiver terminal considers the service type of the service data and the resource reservation time corresponding to the service type, the MAC layer informs the physical layer of sensing the side link resource.

For example, the service type may be that the service data is a periodic service or an aperiodic service, a service data arrival characteristic, a delay, and the like.

For example, the MAC layer of the Rx UE knows that the service type of the service data is an aperiodic service based on the service data communicated between the Rx UE and the Tx UE, and further knows an aperiodic resource reservation aging, the MAC layer of the Rx UE calculates a first time at which the PHY starts to sense the resource based on a first time period and the aperiodic resource reservation aging, for example, the first time period is 100ms to 125ms absolute time, the aperiodic resource reservation aging is 32ms, and in order to ensure that a time domain position corresponding to the resource reserved by the Rx UE is located in the first time period, the first time may be 100ms minus 32ms, that is, 68ms, or a time period from 68ms to 100ms before.

Step 702, the PHY determines information of candidate sidelink resources within a first time period from the sensed sidelink resources, and the PHY reports the information of the candidate sidelink resources to the MAC layer, and accordingly, the MAC layer obtains the information of the candidate sidelink resources within the first time period from the physical layer.

In the embodiment of the application, the PHY receives the sensing indication from the MAC layer to sense the side link resource immediately or at a specified time. If the PHY senses the side link resources in the first time period from the receiving resource pool, the PHY reports the sensed information of the side link resources in the first time period, namely the information of the candidate side link resources to the MAC layer.

It can be understood that, the PHY starts sensing the sidelink resources immediately after receiving the sensing instruction or starts sensing the sidelink resources after a specified time, and then the PHY reports the sidelink resources within the first time period of all the sidelink resources sensed after receiving the sensing instruction as candidate sidelink resources to the MAC layer. In other words, the candidate sidelink resources within the first time period may be regarded as sidelink resources that the PHY perceives as being available for the transmitting terminal to transmit the service data to the receiving terminal.

The candidate sidelink resource in the embodiment of the present application means that the time domain position of the candidate sidelink resource is located in the first time period.

It can be understood that, in the case of receiving the sensing indication, the PHY in the embodiment of the present application senses not only the sidelink resources within the first time period, but also the sidelink resources outside the first time period from the first time or the specified time point.

The specified time point may be a time point determined by the PHY itself after receiving the sensing indication, or the specified time point may be a time point negotiated by the PHY and MAC layers, or the specified time point may be a time point notified to the PHY layer by the MAC layer. For example, the MAC layer notifies the PHY layer of information indicating a specified point in time. For example, the MAC layer transmits a first time and a time length to the PHY layer as information indicating a designated time point, and the PHY layer may determine the designated time point according to the first time and the time length. Or the MAC layer notifies the PHY layer of the specified time point. The specified time point is different from the first time point, and the specified time point is located after the first time point.

The candidate sidelink resources may be all or part of sidelink resources in the M candidate sidelink resources sensed by the PHY from the first time or from the specified time point to the sensing end, which is not limited in the embodiment of the present application.

Similarly, when the PHY reports information of candidate sidelink resources to the MAC layer, the inter-layer interaction between the PHY and the MAC layer may be understood to depend on the implementation of the receiver terminal, which is not limited in this embodiment of the present application.

When the number of the candidate sidelink resources is multiple, the PHY reporting the information of the candidate sidelink resources to the MAC layer can be implemented by any one of the following manners:

and a mode a, the PHY reports candidate side-link resources positioned in a first time period to the MAC layer one by one.

For example, the PHY senses that the candidate sidelink resource a is transmitted to the MAC layer as sensing result 1, where the sensing result 1 includes information of the candidate sidelink resource a. Then, the PHY senses that the candidate sidelink resource b is sent to the MAC layer as a sensing result 2, where the sensing result 2 includes information of the candidate sidelink resource b, and so on until the PHY finishes reporting the information of all candidate sidelink resources to the MAC layer.

And b, the PHY reports the information of partial candidate sidelink resources to the MAC layer, and then reports the information of the rest candidate sidelink resources to the MAC layer successively.

For example, in the method b, if the PHY senses the candidate sidelink resources 1 to 4, the PHY sends a sensing result 1 to the MAC layer, and the sensing result 1 includes information of the candidate sidelink resources 1 to 2. Subsequently, the PHY may report the information of the candidate sidelink resources 3 and the information of the candidate sidelink resources 4 to the MAC layer one by one.

In the mode c, the PHY uniformly reports information of all candidate sidelink resources in the plurality of candidate sidelink resources to the MAC layer, which is not limited in this embodiment of the present application.

For example, in the method c, the PHY transmits a sensing result to the MAC layer, where the sensing result includes information of all candidate sidelink resources. In the method c, the information of all candidate sidelink resources may be carried in the same sensing result, or may be carried in different sensing results.

Step 703, which is the same as step 603, is not described herein again.

In the case that the receiver terminal employs a discontinuous reception DRX mechanism, the DRX cycle includes an active period (on duration) and a sleep period (opportunity for DRX), and in different cases, the receiver terminal turns on timers in different DRX parameters, which may cause a difference in specific behavior of the receiver terminal, and how the receiver should perceive the DRX cycle to provide the first information will be described below.

Case 1-1, the first time period is within the activation period of the recipient terminal.

In case 1-1, the activation status of the receiving terminal is the status of the receiving terminal during the activation period. The dormant state is the state of the receiving terminal in the dormant period.

In case 1-1, as a possible implementation manner, step 701 in the embodiment of the present application may be implemented by: the MAC layer transmits the sensing indication and information indicating a first time period to the PHY at a first time, the first time being within the sleep period and the first time being before the first time period.

For example, as shown in fig. 8, fig. 8 takes DRX cycle 1 and DRX cycle 2 of the receiving terminal, where DRX cycle 1 is located before DRX cycle 2, and DRX cycle 1 and DRX cycle 2 are adjacent as an example. Before the on duration in DRX cycle 2 (i.e., T1 in fig. 8) starts, the MAC layer of the receiving terminal notifies the PHY to start sensing and to sense that the corresponding target receiving resource range is on at time n1 (i.e., the first time) in the sleep period in DRX cycle 1, in consideration of the traffic type and the resource reservation duration corresponding to the traffic type. Wherein, the time period corresponding to the time period from the time n1 to the start time of the on duration in the DRX cycle 2 is the time corresponding to the resource reservation time, and if the MAC layer sends the sensing indication to the PHY earlier than the time n1, the PHY may select the resource before the on duration in the DRX cycle 2, that is, the resource of the receiving terminal in the sleep period in the DRX cycle 1. Therefore, the MAC layer sending the sensing indication to the PHY at time n1 may ensure that the resources selected by the PHY are within the on duration of DRX cycle 2, thereby saving power consumption. The term target receiving resource refers to a sidelink resource through which the receiving terminal can receive traffic data from the second terminal.

The target receiving resource range is a time domain position of a sidelink resource that can be used for receiving service data sent by a sender terminal.

As shown in fig. 8, the time n1 is located in a sleep period adjacent to the active period corresponding to the first time period. Time n1 is before time n 2. In other words, the time n1 is located in a sleep period (i.e., a sleep period in DRX cycle 1) adjacent to the on duration (i.e., the active period in DRX cycle 2) corresponding to the first time period. This n2 time can be understood as: the end of the sleep period in DRX cycle 1 or the start of the active period in DRX cycle 2. The time n2 may be any time from time 1 in DRX cycle 1 to the end of the sleep period in DRX cycle 1. In fig. 8, time n2 is taken as an example of the time when the sleep period in DRX cycle 1 ends.

For example, as shown in fig. 8, the first period is located at the on duration in DRX cycle 2, i.e., T1 in fig. 8, during which the receiving terminal is in an active state. The time n1 in fig. 8 is the first time. The first time period is located in the activation period, which may be the same as the activation period or less than the duration of the activation period, for example: the duration of this first period is the duration of the DRX-onDurationTimer that runs during the active period in DRX cycle 2.

For example, when the service data sent by the sender terminal is a periodic service, the receiver terminal uses the first information to provide sidelink resources for the sender terminal, where sidelink resources within the time corresponding to the time limit should be reserved for resources of the periodic service, that is, t in fig. 8; when the service data sent by the sender terminal is aperiodic service, the receiver terminal uses the first information to provide sidelink resources for the sender terminal, which should be sidelink resources within the time corresponding to the resource reservation time of the aperiodic service, i.e. t in fig. 8.

As a possible implementation manner, in this embodiment, the receiving side terminal determines that the service data is a periodic service or an aperiodic service, and may use an indication of a service identifier in a signaling of a higher layer (such as an MAC layer or an RRC layer), or may use a previously monitored indication of a reserved resource carried in an SCI sent by the sending side terminal, which is not limited in this embodiment of the present application. The receiving terminal can sense the side link resource and provide effective auxiliary information by judging whether the service data is periodic service or aperiodic service.

In case 1-1, in order to ensure timeliness of the subsequent receiving terminal transmitting the first information, the PHY reporting the information of the candidate sidelink resource to the MAC layer may be implemented as follows:

in a possible embodiment, the sidelink resource in the embodiment of the present application may correspond to an effective time period (determined by an effective start time and an effective deadline), and the effective time period corresponding to the sidelink resource indicates that the sidelink resource is available in the effective time period, that is, the sidelink resource may be a resource for the receiving terminal to receive the service data in the effective time period, and at this time, the sidelink resource may be considered to be effective. In other words, sidelink resources that are not within the validity period may be considered invalid. The failure of the sidelink resource means that the sidelink resource cannot be used as a resource for receiving the service data by the receiving terminal. For example, if the validity time of the sidelink resource a is from time a to time L, the sidelink resource a may be considered valid before time L, and if the time L is exceeded, the sidelink resource a may be considered invalid. Here, it is uniformly stated that, in the following description, the times may be referred to for all descriptions related to candidate sidelink resource failure or sidelink resource failure, and details are not described in the following.

Mode 1-1, the PHY reports information of candidate sidelink resources to the MAC layer before T1 begins (e.g., the PHY is at least before time n2 or n2 in fig. 8), and/or before the candidate sidelink resources fail. It is understood that time n1 is before time n 2.

For example, the candidate sidelink resource includes a candidate sidelink resource 1 and a candidate sidelink resource 2, the effective deadline of the candidate sidelink resource 1 is Tm, the effective deadline of the candidate sidelink resource 2 is Tn, Tm and Tn are located before T1, and Tm is earlier than Tn, then the PHY reports the information of the candidate sidelink resource 1 and the information of the candidate sidelink resource 2 to the MAC layer before Tm. The effective deadline of each candidate sidelink resource may be preconfigured, or may be an inherent attribute of a resource pool configured by the network device, or the effective deadline may be defined by the receiving terminal, which is not limited in this embodiment of the present application.

In case 1-1, as a possible implementation manner, the sending, by the receiving terminal, the first information to the sending terminal in step 703 in the embodiment of the present application may be implemented by: the receiving terminal transmits the first information to the second terminal at a second time (e.g., at time n2 in fig. 8), which is before the first time period and which is during the sleep period. Therefore, the timeliness of the side link resource provided by the receiving terminal to the sending terminal can be ensured.

In case 1-1, as another possible implementation manner, the sending, by the receiving terminal, the first information to the sending terminal in step 703 in the embodiment of the present application may be implemented by: the receiving terminal sends the first information to the second terminal before the first time period starts and before the sidelink resources fail. Reference may be made to the above description for how to determine a sidelink resource failure, which is not described in detail herein.

Based on case 1-1, if the receiving terminal perceives the sidelink resources after the end of the on duration (i.e., T1 in fig. 9), the receiving terminal reserves the sidelink resources after the end of the on duration. In addition, the receiving terminal determines whether the PSCCH scheduling signal is received and whether the PSCCH is successfully demodulated within the on duration. Based on whether the receiving terminal successfully demodulates the PSCCH, which causes a difference in the manner in which the receiving terminal determines the first time period, the following will describe the specific contents of the first time period in conjunction with cases 1-2-1 and 1-2-2, respectively:

in case 1-2-1, the first timer is a sidelink DRX inactivity timer (DRX-inactivity timer sl), the first time period is a timing duration of the first timer of the receiving side terminal, and the first timer is used to maintain an active state of the receiving side terminal. I.e., the first period of time is the timing duration of the sidelink DRX inactivity timer. The timing duration of the first timer means the duration of the first timer from the beginning to the end of its operation.

Referring to fig. 9, T1 is the duration of the active period of DRX cycle 2 of the terminal. The first timer has a timing length of T2 time period. The receiving terminal is in the active state in both the T1 time period and the T2 time period, and since there is an overlap between T1 and T2, it can be considered that the active state of the receiving terminal is extended to the time when T2 ends in the time period after T1 ends and before T2 ends. In fig. 9, the sleep state of the receiving terminal in DRX cycle 2 is the time after T2 is finished, i.e., S1 in the figure.

In fig. 9, the receiving terminal is in an active state in T1 and continues to maintain the active state in T2.

In this case 1-2-1, as a possible implementation manner, the above step 701 may be implemented by: the MAC layer transmits the sensing indication and information indicating the first time period to the PHY at a first time (such as at time n4 in fig. 9), at which the receiving terminal is in an active state.

To describe this case 1-2-1 in detail, as shown in fig. 9: the MAC layer of the receiving terminal informs the PHY of the perceived resources at time n3 in DRX cycle 1 and provides the PHY with time period information (e.g., T1) in DRX cycle 2 to instruct the PHY to report candidate sidelink resources in T1. The PHY senses the sidelink resource based on the sensing indication of the MAC layer, and if the PHY of the receiving terminal senses the sidelink resource (for example, sidelink resource 1 in fig. 9) located after the on duration (i.e., T1 in fig. 9), the PHY of the receiving terminal reserves the information of the sidelink resource 1 and determines whether the control channel scheduling signal is received and whether the demodulation is successful.

Case a, if the receiving side terminal does not receive the PSCCH scheduling signal during the on duration (i.e., T1 in fig. 9), the receiving side terminal may not transmit the auxiliary information for the information indicating the sidelink resource 1 even though the PHY of the receiving side terminal perceives the sidelink resource located after the end of the active period T1. This is because the sidelink resource 1 is not within the active time range, i.e. the step of the receiving terminal sending the auxiliary information to the sending terminal can be omitted.

In case b, if the receiving side terminal receives the PSCCH within the on duration (i.e., T1 in fig. 9) and demodulates successfully, as shown in fig. 9, the receiving side terminal starts a first timer (e.g., drx-InactivityTimerSL whose operation time length is T2) at time n4 (corresponding to the first time), and the receiving side terminal continues to keep monitoring the state of the traffic data (i.e., the newly transmitted data) sent by the sending side terminal during the drx-InactivityTimerSL operation, that is, the active state of the receiving side terminal is maintained. In addition, the receiving terminal starting the first timer means that the range of the sidelink resource provided by the receiving terminal to the transmitting terminal is expanded. That is, the time n4 is the start time of the operation of drx-inactivityttimersl, and the receiving terminal maintains the active state from the time n4 to the stop time of the drx-inactivityttimersl operation.

While the receiving terminal receives the PSCCH and demodulates successfully (time n4 in fig. 9, time n4 is within T1, and the receiving terminal is in an active state within T1), then, as another possible implementation manner, step 701 in this embodiment of the present application may be implemented as follows: the MAC layer of the receiving terminal transmits the sensing indication to the PHY at time n4 (corresponding to the first time), and notifies the PHY that the first time period is the running time of drx-inactivity timer, i.e., T2 in fig. 9. And the PHY of the receiving terminal performs sending based on the perception instruction of the MAC layer, and if the PHY of the receiving terminal perceives the sidelink resources in the T2, the PHY reports the information of the candidate sidelink resources in the time range of T2 to the MAC layer. Alternatively, in the embodiment shown in fig. 9, at time n4, the MAC layer sends a sensing notification to the notification PHY, where the sensing notification is used to indicate that the sensing time is extended. Or at time n4, the MAC layer sends a perception notification to the notification PHY instructing the PHY to do side-link resource perception and information indicating the first time period.

As can be understood from fig. 9, at time n3, the MAC layer has notified the PHY to perform sensing, and the PHY also performs the sensing process, and due to the operation of the drx-inactivity timer, at time n4, the MAC layer notifies the PHY to perform sensing again, and the PHY continues to sense and report information of sidelink resources within the duration of the drx-inactivity timer.

As a possible embodiment, in case 1-2-1, the method provided in this embodiment may further include, before step 701: in the operation process of any timer corresponding to the receiving side terminal being in the active state, the receiving side terminal starts the first timer at a first time (for example, at time n4 in fig. 9), where the first time is a time at which the receiving side terminal successfully demodulates the PSCCH scheduling signal in the active state.

In case 1-2-1, the specific implementation that the MAC layer notifies the PHY of the receiver terminal to start sensing resources and notifies the PHY that the range of the currently sensed corresponding target receiving resources is the duration of the currently operating drx-inactivity timer may refer to the manner in which the MAC layer notifies the PHY in case 1-1, and is not described herein again.

In order to ensure timeliness of the first information and prevent the failure of the sidelink resource when the sender terminal receives the information of the sidelink resource, as a possible embodiment, as shown in fig. 9, in this case 1-2-1, in step 702 of this embodiment of the present application, the process of the PHY reporting the information of the candidate sidelink resource to the MAC layer may be implemented by: the PHY transmits information of the candidate sidelink resource to the MAC layer before the first timer times out and before the candidate sidelink resource fails.

For example, the PHY reports information of the candidate sidelink resources as the sensing result to the MAC layer before the drx-InactivityTimerSL times out and before the candidate sidelink resources fail. For example, the drx-inactivity timer sl operation time period is [5ms,20ms ], the sensing result includes time-frequency resources with time-domain times of 7ms, 9ms, 15ms, and 18ms as one or more candidate sidelink resources, and then reasonable cases may be: the PHY reports information of all candidate sidelink resources in the one or more candidate sidelink resources to the MAC layer in at least 6ms, or the PHY reports a time-frequency resource with time domain time of 7ms to the MAC layer in 6ms, reports a time-frequency resource with time domain time of 9ms in 8ms, and the like.

Unreasonable situations are as follows: the PHY reports information of all sidelink resources in one or more candidate sidelink resources to the MAC layer in the 20 th ms, or the PHY reports a time-frequency resource with the time domain time of 7ms to the MAC layer in the 7 th ms, reports a time-frequency resource with the time domain time of 9ms in the 9 th ms, and so on.

As for the way for the PHY to report the candidate sidelink resource to the MAC layer, reference may be made to the related description in case 1-1 above, and details of the embodiment of the present application are not described herein again.

In order to ensure timeliness of the first information, as a possible embodiment, in this case 1-2-1, the process of the receiving terminal sending the first information to the sending terminal in this embodiment of the application may be implemented by: the receiving terminal sends first information to the sending terminal before the time-out of the drx-InactivetyTimerSL and/or before the failure of the sidelink resources.

In conjunction with fig. 9, the receiving terminal may send the first information to the transmitting terminal before time n5 (corresponding to the second time) and before the sidelink resource fails. For a specific example, reference may be made to the above-mentioned example in which the PHY reports the candidate sidelink resource to the MAC layer, and details are not described here.

It should be noted that, in the above case 1-2-1, the receiving side terminal determines whether the PSCCH is received during the on duration (i.e. T1 in fig. 9) operation is taken as an example, but the above case still applies: in the time period corresponding to the activated state of the receiving terminal, the receiving terminal receives the PSCCH and demodulates successfully, and starts the behavior after drx-inactivity timer sl, which is not limited in this embodiment of the present application, in other words, any one of the timers corresponding to the activated state may be any one of the following: drx-onDurationTimerSL or drx-inactivyttimersl or drx-retransmission timersl or ra-contentresulcolitiontimtimer.

In case 1-2-2, the first time period is a duration of a first timer of the receiving side terminal, and the first timer is started when the receiving side terminal determines to receive the retransmission data transmitted by the sending side terminal on the sidelink in the activated state. For example, the first timer is drx-retransmission timersl. In fig. 10, the recipient terminal is in an active state during a T1 period, a T2 period, and a T3 period. The duration (also referred to as the running duration) of drx-retransmission timersl is the time period during which the receiving terminal continues to maintain the active state.

If the receiving terminal receives the PSCCH in the active state but does not demodulate successfully, the receiving terminal determines in the active state to receive retransmission data transmitted by the transmitting terminal on a sidelink.

As a possible embodiment, in case 1-2-2, the method provided in this embodiment may further include: and in the running process of any timer corresponding to the activated state of the receiving side terminal, if the receiving side terminal does not successfully demodulate the PSCCH scheduling signal, the receiving side terminal starts a second timer and a third timer. The receiving terminal may also start the first timer when the second timer times out. The receiving terminal can listen to the retransmission data during the operation of the first timer. And the second timer represents the minimum waiting time before the receiving terminal starts to receive the retransmission data of the service data.

For example, the third timer is drx-InactivityTimerSL. The second timer is drx-HARQ-RTT-TimerSL.

To describe the case 1-2-2 in detail, referring to fig. 10, as shown in fig. 10, at the time n1 when the receiving terminal is in the sleep state, the MAC layer of the receiving terminal sends a sensing indication to the PHY of the receiving terminal, and T1. If the PHY of the receiving terminal senses the sidelink resource after the on duration (i.e. T1 in fig. 10) is finished, the PHY of the receiving terminal reserves the sidelink resource sensed after T1 and determines whether the PSCCH scheduling signal is received and whether the demodulation is successful.

The case c, like the case a, is not described herein again.

In case d, if the receiving terminal receives the PSCCH scheduling signal within the on duration (i.e., T1 in fig. 10) but does not demodulate successfully, the receiving terminal simultaneously turns on drx-InactivityTimerSL and drx-HARQ-RTT-TimerSL at time n6 in fig. 10. The description of drx-InactivityTimerSL is described in case 1-2-1, and is not repeated here.

When drx-HARQ-RTT-TimerSL times out, the receiving terminal starts drx-retransmission TimerSL, namely the receiving terminal monitors retransmission data sent by the sending terminal during the running period of the drx-retransmission TimerSL, and the range of the information of the sidelink resources provided by the receiving terminal to the sending terminal is expanded.

Thus, in case 1-2-1, step 701 in the embodiment of the present application may be implemented by: while the receiving terminal turns on drx-retransmission timersl (i.e., at time n7 in fig. 10, corresponding to the first time described above), the MAC layer sends the PHY a sensing indication and a T3 period. Wherein, the T3 time period is the duration of drx-retransmission timersl operated by the receiving terminal.

The PHY starts sensing according to the sensing indication. And if the PHY senses the candidate sidelink resources in the range of the drx-retransmission TimerSL, reporting the sensing result to the MAC layer. The sensing result includes candidate sidelink resources within the time period of T3.

As can be understood from fig. 10, at time n1, the MAC layer has notified the PHY to sense, and the PHY also performs the sensing process, and due to the operation of drx-retransmission timersl, at time n7, the MAC layer notifies the PHY that sensing needs to be continued for a prolonged period of time, and the PHY will continue sensing. Then, if the PHY senses the sidelink resource within the duration of the drx-retransmission TimerSL, the PHY reports the information of the sidelink resource within the duration of the drx-retransmission TimerSL to the MAC layer. Alternatively, in the embodiment shown in fig. 10, at time n7, the MAC layer sends a sensing notification to the notification PHY, where the sensing notification is used to indicate that the sensing time is extended. Or at time n7, the MAC layer sends a perception notification to the notification PHY instructing the PHY to do side-link resource perception and information indicating the first time period. The perception notification may include only the information for the first time period without the perception indication, with the default perception time being extended after the PHY receives the information for the first time period.

Referring to fig. 10, the timing duration of the first timer is T3, and the activation state of the receiver terminal includes a T3 time period in addition to the T1 time period and the T2 time period; the sleep state of the receiver terminal includes periods other than T1, T2, T3 in DRX cycle 2.

It should be noted that, in order to ensure timeliness of sending the first information from the receiving terminal to the sending terminal, in case 1-2-1, the PHY reporting the information of the candidate sidelink resource to the MAC layer may be implemented as follows: the PHY reports information of the candidate sidelink resources to the MAC layer before the drx-retransmission timersl expires, and/or before the PHY perceives the candidate sidelink resource as failing within T3.

In this case 1-2-2, the manner in which the PHY reports the information of the perceived candidate sidelink resource to the MAC layer may refer to the description in the above embodiment, and is not described herein again.

In this case 1-2-2, the sending of the first information from the receiving terminal to the sending terminal in step 703 in the embodiment of the present application may be implemented by: the receiving terminal sends the first information to the sending terminal before the drx-retransmission timersl times out and before the sidelink resource fails. For example, the information reported to the MAC layer candidate sidelink resource by the same PHY may be referred to.

As shown in fig. 10, before time n8 and before the sidelink resource fails, the receiving terminal transmits the first information to the transmitting terminal.

It should be noted that, although in the above description of the present case, the receiving side terminal determines whether the PSCCH is received during the on duration operation, the above description still applies to the case that the receiving side terminal is in the timer operation period corresponding to the active state, and the receiving side terminal receives the PSCCH and does not successfully demodulate and turns on drx-HARQ-RTT-TimerSL. And when the drx-HARQ-RTT-TimerSL is overtime, the receiving terminal starts the action after the drx-retransmission TimerSL.

As a possible embodiment, the method provided in this embodiment of the present application may further include, before step 603: and the receiving terminal screens and sorts the perceived candidate sidelink resources to determine partial candidate sidelink resources from the candidate sidelink resources as the sidelink resources.

For example, if the number of candidate sidelink resources is multiple, the candidate sidelink resources may be sorted and filtered before the receiving terminal sends the first information. For example, when the resource for transmitting the first information available to the receiving terminal is limited, the receiving terminal may filter out, from the plurality of candidate sidelink resources, a candidate sidelink resource having a quality greater than or equal to a quality threshold as a sidelink resource. Or, when the number of the first information transmitted by the receiving terminal is limited, the receiving terminal may sort the quality of the candidate sidelink resources from top to bottom, and then select the candidate sidelink resource with the highest quality as the sidelink resource according to the number of the first information transmitted. For example, the receiver terminal may use, as the sidelink resource, a candidate sidelink resource whose CBR value is lower than a threshold value in the candidate sidelink resources. Or the receiving terminal sorts the CBR values of each candidate sidelink resource in the candidate sidelink resources. When the number of resources for sending the first information by the receiver terminal is limited, the receiver terminal may sort the CBR values of the multiple candidate sidelink resources from low to high, and then select the candidate sidelink resource with the low CBR value as the sidelink resource.

For example, the number of resources for sending the first information is 2, and the plurality of candidate sidelink resources include candidate sidelink resources 1 to 3, the CBR value of the candidate sidelink resource 1 is the lowest, and the CBR value of the candidate sidelink resource 2 is greater than the CBR value of the candidate sidelink resource 1 but less than the CBR value of the candidate sidelink resource 3. The receiving terminal may select candidate sidelink resources 1 through 2 as sidelink resources.

In conjunction with the description of case 1-2-1 and case 1-2-2, the first time period is a timing duration of a first timer of the receiving-side terminal, and the first timer is used to maintain an active state of the receiving-side terminal.

The foregoing embodiments mainly describe how to perceive the sidelink resource, and the following will exemplarily describe, in combination with cases 3-1 to 3-3, how the receiving terminal determines that the sensing for the receiving resource pool can be stopped, so as to avoid that the time domain position of the sidelink resource indicated by the first information is in the sleep period.

In a possible embodiment, in this application embodiment, if the receiving-side terminal receives the MAC CE within the time of the active state or the timer corresponding to the active state running, or does not receive the PSCCH scheduling signal before the timer times out, the receiving-side terminal stops sensing the sidelink resource.

The process of the receiving terminal stopping perceiving sidelink resources will be described below in connection with case 3-1 to case 3-3, respectively.

In case 3-1, in combination with the above case 1-2-1, as shown in fig. 11, during the DRX-inactivity timer sl operation period of the receiving terminal (T2), the receiving terminal receives the sidelink DRX command MAC CE, or does not receive the PSCCH scheduling signal for scheduling transmission until the DRX-inactivity timer sl times out, and the receiving terminal enters the sleep period for DRX cycle 2.

Specifically, the receiving terminal enters the sleep period for DRX cycle 2 upon receiving the sidelink DRX command MAC CE. Or after the DRX-inactivity timer sl is timed out, the receiving terminal enters the sleep period for the DRX cycle 2 and keeps the sleep state in the DRX cycle 2.

Case 3-1 will now be described in detail with reference to step 11 to step 12 or step 11 and step 13.

Step 11, under the condition that the receiving side terminal is in the active period in DRX cycle 2 as shown in fig. 11, if the receiving side terminal receives the PSCCH scheduling signal and demodulates successfully, the receiving side terminal starts a first timer (e.g., DRX-inactivity timersl) at time n4, and the receiving side terminal monitors the service data sent by the sending side terminal during DRX-inactivity timersl operation, which means that the range of side link resources perceived by the receiving side terminal is expanded.

And step 12, during the DRX-inactivityttimersl running period, the receiving terminal does not receive the PSCCH scheduling signal for continuing scheduling transmission, and when the DRX-inactivityttimersl of the receiving terminal is overtime, the receiving terminal enters a sleep period aiming at the DRX cycle 2, and the receiving terminal stops sensing the sidelink resources when the DRX-inactivityttimersl of the receiving terminal is overtime.

Specifically, the MAC layer of the receiving terminal notifies the PHY to stop sending the auxiliary information, or the PHY determines that the service data of the sending terminal corresponding to the drx-InactivityTimerSL is not received during drx-InactivityTimerSL operation, and after drx-InactivityTimerSL is timed out, the PHY automatically stops sending the sidelink resource indicated by the first information, and the MAC layer defaults to stop sending the sidelink resource indicated by the first information.

Step 13, during the DRX-inactivity timer sl operation, the receiving terminal receives the sidelink DRX command MAC CE, and the receiving terminal enters the sleep period for the DRX cycle 2, and the receiving terminal should stop sensing sidelink resources when receiving the sidelink DRX command MAC CE. The sidelink drx command MAC CE is a MAC layer command that can cause the receiving terminal to enter a sleep state.

The difference between step 12 and step 13 is that: in step 12, the receiver terminal will time out at DRX-inactivity timer sl and the receiver terminal will enter the sleep period for DRX cycle 2, and in step 13, the receiver terminal enters the sleep period for DRX cycle 2 upon receiving sidelink DRX command MAC CE within DRX-inactivity timer sl running time, in other words, the time at which the receiver terminal enters the sleep period for DRX cycle 2 in step 13 is earlier than or equal to the time at which the receiver terminal enters the sleep period for DRX cycle 2 in step 12. If the receiving terminal receives the sidelink drx command MAC CE in step 13, the receiving terminal directly enters the sleep state without the related step of step 12.

As a specific implementation: the receiving terminal's MAC layer informs the PHY layer to stop sending for auxiliary information, or the PHY judges that the sidelink drx command MAC CE is received in the drx-InactivtyTimerSL running period, then the PHY automatically stops sending for the sidelink resources indicated by the first information, and meanwhile the MAC defaults to stop sending for the sidelink resources indicated by the first information.

In case 3-2, in combination with the above case 1-2-2, during the DRX-retransmission timersl operation of the receiving terminal, the receiving terminal receives the sidelink DRX command MAC CE, or the PSCCH scheduling signal for scheduling transmission is not received until the DRX-retransmission timersl is timed out, and the receiving terminal enters the sleep period for the current DRX cycle.

Case 3-2 will now be described in detail with reference to step 31 to step 32, or step 31 and step 33.

Step 31, assuming that the receiving side terminal is currently located in the active period of DRX cycle 2, and the receiving side terminal receives the PSCCH scheduling signal but does not demodulate successfully, the receiving side terminal simultaneously starts DRX-InactivityTimerSL and DRX-HARQ-RTT-TimerSL, that is, the receiving side terminal monitors the service data sent by the sending side terminal during the DRX-InactivityTimerSL running period, and starts DRX-retransmission TimerSL when DRX-HARQ-RTT-TimerSL times out.

Step 32, during the time that DRX-InactivityTimerSL is out of service and DRX-retransmission timersl is running, the receiving terminal does not receive the PSCCH scheduling signal for continuing scheduling transmission, the DRX-retransmission timersl of the receiving terminal is out of service, the receiving terminal enters the sleep period aiming at DRX cycle 2, and the receiving terminal stops sensing sidelink resources when DRX-retransmission timersl is out of service.

As a specific implementation: the MAC layer of the receiving terminal notifies the PHY layer to stop the sending of the sidelink resource indicated by the first information, or the PHY determines that the service data of the sending terminal corresponding to the drx-retransmission timersl is not received during the drx-retransmission timersl operation, and the PHY automatically stops the sending of the sidelink resource indicated by the first information, and the MAC defaults to stop the sending of the sidelink resource indicated by the first information.

Step 33, during the DRX-retransmission timersl operation period, the receiving terminal receives the sidelink DRX command MAC CE, and the receiving terminal enters the sleep period for DRX cycle 2. In case that the receiving terminal receives the sidelink drx command MAC CE, the receiving terminal stops the sending of the sidelink resource described in case 1-2-2.

As a specific implementation: the MAC layer of the receiving terminal notifies the PHY to stop the sending of the sidelink resource indicated by the first information, or when the PHY determines that the sidelink drx command MAC CE is received within the drx-retransmission timersl running period, the PHY automatically stops the sending of the first information, and the MAC defaults to stop the sending of the first information.

Case 3-3, in combination with case 1-1 above, if the receiving side terminal is in the active period of DRX cycle 2, if the receiving side terminal receives the sidelink discontinuous reception command MAC CE, the receiving side terminal enters the sleep period within DRX cycle 2 and stops perceiving sidelink resources. Or, the receiving side terminal does not receive the PSCCH scheduling signal for scheduling the service data in the active period of DRX cycle 2, and after the active period of DRX cycle 2 is finished, the receiving side terminal enters the dormant period and stops sensing the sidelink resources.

In the case where the receiver terminal may select a sidelink resource from the resource pool, the receiver terminal may provide the first information to the sender terminal to indicate to the sender terminal the sidelink resource at which the receiver terminal is capable of receiving data. However, since the receiving terminal employs the DRX mechanism, in order to prevent the sidelink resource recommended by the receiving terminal to the sending terminal by using the first information for sending data from being in the sleep period of the receiving terminal and not belonging to the active period of the receiving terminal, the receiving terminal should stop the sending of the current DRX cycle when the receiving terminal is about to enter the sleep period, so as to avoid providing the information of the sidelink resource in the sleep period of the receiving terminal, thereby achieving the purpose of saving power for the receiving terminal.

The above-mentioned scheme of the embodiment of the present application is introduced mainly from the perspective of interaction between network elements. 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. 6 to 11, and a communication apparatus provided in the embodiment of the present application for performing the method is described below. Those skilled in the art can understand that the method and the 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 terminal and the network device in the analysis method.

In the case of employing an integrated unit, fig. 12 shows a communication apparatus referred to in the above-described embodiment, which may include: a communication module 1213 and a processing module 1212.

In an alternative implementation, the communication device may further include a storage module 1211 for storing program codes and data of the communication device.

In one example, the communication device is a first terminal or a chip applied in the first terminal. In this case, the communication module 1213 is used to support the communication device to communicate with an external network element (e.g. a second terminal). For example, the communication module 1213 is used to perform the signal transceiving operation of the terminal in the above-described method embodiment. The processing module 912 is configured to perform the signal processing operation of the terminal in the above method embodiment.

For example, the communication module 1213 is configured to perform the sending action performed by the first terminal in step 603 of fig. 6 in the foregoing embodiment. A processing module 1212, configured to support the communication apparatus to perform the actions performed by the first terminal in steps 601 to 602 in fig. 6.

The processing module 1212 may be a processor or controller, such as a central processing unit, a general purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, a transistor logic device, a hardware component, or any combination thereof. Which may implement or perform the various illustrative logical blocks, modules, and circuits described in connection with the disclosure. A processor may also be a combination of computing functions, e.g., a combination of one or more microprocessors, a digital signal processor and a microprocessor, or the like. 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 1212 is the processor 21 or the processor 25, the communication module 1213 is the transceiver 23, and the storage module 1211 is the memory 22, the communication apparatus according to the present application may be the communication device shown in fig. 2.

Fig. 13 is a schematic structural diagram of a chip 130 according to an embodiment of the present disclosure. Chip 130 includes one or more (including two) processors 1310 and a communication interface 1330.

Optionally, the chip 130 further includes a memory 1340, which may include both read-only memory and random access memory 1340, and provides operating instructions and data to the processor 1310. A portion of memory 1340 may also include non-volatile random access memory (NVRAM).

In some embodiments, memory 1340 stores elements, execution modules or data structures, or a subset thereof, or an expanded set thereof.

In the embodiment of the present application, by calling an operation instruction stored in the memory 1340 (the operation instruction may be stored in an operating system), a corresponding operation is performed.

One possible implementation is: the first terminal and the second device have similar structures, and different devices can use different chips to realize respective functions.

The processor 1310 controls processing operations of any one of the first terminal and the second device, and the processor 1310 may also be referred to as a Central Processing Unit (CPU).

Memory 1340 may include both read-only memory and random-access memory, and provides instructions and data to processor 1310. A portion of memory 1340 may also include NVRAM. For example, in applications where memory 1340, communication interface 1330, and memory 1340 are coupled together by bus system 1320, where bus system 1320 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 as bus system 1320 in fig. 13.

The method disclosed in the embodiments of the present application may be applied to the processor 1310, or implemented by the processor 1310. The processor 1310 may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the above method may be performed by integrated logic circuits of hardware or instructions in the form of software in the processor 1310. The processor 1310 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, or 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 1340, and the processor 1310 reads the information in the memory 1340, and combines the hardware to complete the steps of the above-mentioned method.

In one possible implementation, the communication interface 1330 is configured to perform the steps of receiving and transmitting by the first terminal in the embodiment shown in fig. 6. The processor 1310 is configured to perform the steps of the processing of the first terminal in the embodiment shown in fig. 6.

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.

In one aspect, a computer-readable storage medium is provided, in which instructions are stored, and when executed, implement the functions performed by the first terminal in fig. 6 and 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. 6 and 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 as shown in fig. 6.

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 performed by the first terminal in fig. 6 and 7, and the second terminal is configured to perform the functions performed by the second terminal in fig. 6 and 7.

In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer programs or instructions. When the computer program or instructions are loaded and executed on a computer, the processes or functions described in the embodiments of the present application are performed in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, a network appliance, a user device, or other programmable apparatus. The computer program or instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another computer readable storage medium, for example, the computer program or instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center by wire or wirelessly. The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. that integrates one or more available media. The usable medium may be a magnetic medium, such as a floppy disk, a hard disk, a magnetic tape; or optical media such as Digital Video Disks (DVDs); it may also be a semiconductor medium, such as a Solid State Drive (SSD).

While the present application has been described in connection with various embodiments, other variations to the disclosed embodiments can be understood and effected by those skilled in the art in practicing the claimed application, from a review of the drawings, the disclosure, and the appended claims. In the claims, the word "comprising" does not exclude other elements or steps, and the word "a" or "an" does not exclude a plurality. A single processor or other unit may fulfill the functions of several items recited in the claims. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.

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

Claims

1. A method for determining sidelink resources, for use in a first terminal having an active state and a dormant state, the method comprising:

sensing sidelink resources;

determining information of candidate sidelink resources located within a first time period during which the first terminal is in the active state;

and sending first information to a second terminal, wherein the first information is information used for indicating side link resources, and the side link resources are all or part of the candidate side link resources.

2. The method of claim 1, wherein the first terminal comprises a Media Access Control (MAC) layer and a physical layer (PHY), and wherein the sensing of the sidelink resource comprises:

the MAC layer sends a sensing indication and information used for indicating a first time period to the PHY, wherein the sensing indication is used for informing the PHY of sensing the side link resource;

the determining information of the candidate sidelink resources located in the first time period includes:

and the PHY determines the information of the candidate sidelink resources in the first time period from the perceived sidelink resources, and reports the information of the candidate sidelink resources to the MAC layer.

3. The method of claim 2, wherein the first terminal employs a Discontinuous Reception (DRX) mechanism, the DRX mechanism comprising an active period and a dormant period,

the MAC layer transmitting a sensing indication and information indicating a first time period to the PHY, including:

the MAC layer transmits a sensing indication and information indicating a first time period to the PHY at a first time, the first time being within the sleep period and the first time being before the first time period, the first time period being within the active period.

4. The method of claim 3, wherein sending the first information to the second terminal comprises:

and sending the first information to the second terminal at a second moment, wherein the second moment is in the dormancy period, and the second moment is before the first time period.

5. The method of claim 2, wherein the first terminal employs a Discontinuous Reception (DRX) mechanism, the DRX mechanism comprising an active period and a dormant period,

the MAC layer sends a sensing indication and information used for indicating a first time period to the PHY at a first moment, and the first terminal is in the activated state at the first moment;

the first time period is a timing duration of a first timer of the first terminal, and the first timer is used for maintaining the active state of the first terminal.

6. The method of claim 5, further comprising:

in the running process of any timer corresponding to the activation state of the first terminal, the first terminal starts the first timer at the first moment;

the first time is the time when the first terminal successfully demodulates the PSCCH scheduling signal of the physical side link control channel in the activated state.

7. The method of claim 5, further comprising:

when a second timer times out, the first terminal starts the first timer, the first terminal monitors retransmission data of the service data during the running period of the first timer, the first time is the time for starting the first timer, and the second timer represents the minimum waiting time before the first terminal starts to receive the retransmission data of the service data.

8. The method of claim 7, further comprising:

and in the operation process of any timer corresponding to the activation state, if the PSCCH scheduling signal is not successfully demodulated, the first terminal starts the second timer.

9. The method according to any one of claims 1 to 8, further comprising:

under the condition that the first terminal is in the activated state, if a side link discontinuous reception command MAC CE is received, sensing of side link resources is stopped; or,

and the first terminal stops sensing the side link resources when not receiving the PSCCH scheduling signal for scheduling the service data in the activation period or before the first timer is overtime.

10. The method according to claim 7 or 8, characterized in that the method further comprises:

when a third timer is overtime and the first timer runs, the PSCCH scheduling signal for continuously scheduling the service data is not received, and when the first timer is overtime, the side link resources are stopped being sensed; or, during the operation period of the first timer, when receiving a sidelink discontinuous reception command MAC CE, stopping sensing the sidelink resource.

11. The method of claim 9 or 10, wherein the ceasing to sense the sidelink resources comprises: the MAC layer sends a stopping sensing instruction to the PHY, and the PHY stops sensing the side link resources according to the stopping sensing instruction; alternatively, the PHY automatically stops perceiving the sidelink resources.

12. The method according to any one of claims 5 to 11, wherein the first terminal sends the first information to the second terminal, and the method comprises:

and the first terminal sends first information to the second terminal before the first timer is overtime and the side link resource is invalid.

13. The method according to any one of claims 1 to 12, wherein the quality of the sidelink resource is greater than or equal to a preset threshold, or the sidelink resource is determined by a channel busy rate CBR of the candidate sidelink resource, and/or the sidelink resource is determined by the number of resources transmitting the first information.

14. A computer-readable storage medium having stored thereon instructions which, when executed, implement the method of any one of claims 1 to 13.

15. 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 13, the communication interface being configured to communicate with a module external to the chip.

16. 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 1-13.