WO2021218740A1

WO2021218740A1 - Method, apparatus and system for determining sidelink resource

Info

Publication number: WO2021218740A1
Application number: PCT/CN2021/088722
Authority: WO
Inventors: 张梦晨; 刘云; 邝奕如; 徐海博
Original assignee: 华为技术有限公司
Priority date: 2020-04-27
Filing date: 2021-04-21
Publication date: 2021-11-04

Abstract

Provided are a method, apparatus and system for determining a sidelink resource, which relate to the technical field of communications, and are used for realizing the situation where a receiver terminal provides auxiliary information to a sender terminal, so as to improve the quality of service data received by the receiver terminal and reduce the power consumption of the receiver terminal. The solution is applied to a first terminal. The first terminal has an active state and an inactive state. The solution comprises: sensing sidelink resources; determining information of candidate sidelink resources within a first time period, wherein a first terminal is in an active state within the first time period; and sending first information to a second terminal, wherein the first information is used for indicating information of the sidelink resources, and the sidelink resources are all or some of the sidelink resources in the candidate sidelink resources. The solution can be applied in the fields of unmanned driving, autonomous driving, aided driving, intelligent driving, connected driving, intelligent connected driving, automobile sharing, etc.

Description

Method, device and system for determining side link resources

This application is required to be submitted to the State Intellectual Property Office on April 27, 2020, the application number is 202010345081.4, the application name is "A Method and UE for Providing Supplementary Information", and the application is submitted to the State Intellectual Property Office on August 5, 2020 The priority of the Chinese patent application with the number 202010787192.0 and the application title is "A method, device and system for determining side link resources", the entire content of which is incorporated into this application by reference.

Technical field

The embodiments of the present application relate to the field of communication technologies, and in particular, to a method, device, and system for determining side link resources.

Background technique

In a long time evolution (LTE) system or a new radio (NR) system, data can be transmitted between terminals through side link resources. Specifically, when the sender terminal (Tx UE) sends service data to the receiver terminal (Rx UE), the Rx UE can sense the side link resources in the resource pool to determine the target side link resource. Then the Rx UE sends auxiliary information to the Tx UE, and the auxiliary information is used to indicate the target side uplink resource selected by the Rx UE. Later, the Tx UE may consider the auxiliary information sent by the Rx UE when selecting side link resources. For example, the Tx UE selects the side link resources used to transmit service data to the Rx UE from the target side link resources, which can improve the data reception quality of the Rx UE.

However, the Rx UE does not always receive service data during the entire time period. In the current prior art, before the Rx UE sends auxiliary information to the Tx UE, the entire time period is in the monitoring state regardless of whether there is service data reception. This will cause excessive power consumption of the Rx UE.

Summary of the invention

The embodiments of the present application provide a method, device, and system for determining side link resources, which are used to implement the receiver terminal to provide auxiliary information to the sender terminal to improve the communication quality of the receiver terminal receiving service data, and reduce the receiver terminal Power consumption.

In order to achieve the above objectives, this application adopts the following technical solutions:

In the first aspect, an embodiment of the present application provides a method for determining a side link resource. The method is applied to a first terminal, and the first terminal has an active state and a sleep state. The method provided in the embodiment of the present application includes: A terminal senses side link resources. The first terminal determines information about candidate side link resources located in a first time period, and the first terminal is in an active state during the first time period. The first terminal sends first information to the second terminal, where the first information is information used to indicate side-link resources, and the side-link resources are all or part of the candidate side-link resources. Road resources.

Based on this, the embodiment of the present application provides a method for determining side link resources. When the first terminal has an active state and a sleep state, in order to prevent the first terminal from providing a range that does not belong to the active time (time range of the active state) In this solution, the first terminal perceives the side link resources. The first terminal determines information about candidate side link resources located in a first time period, and the first terminal is in an active state in the first time period. Then the first terminal provides the second terminal with the first information used to indicate the information of the side link resource, where the side link resource is all or part of the side link resources among the candidate side link resources. Since the time domain position of the side link resource is within the time period when the first terminal is in the active state, it is possible to prevent the first terminal from providing side link resources that are not within the active time range, and side link resources A resource recommended for the first terminal to the second terminal for sending service data to the first terminal, so that the data reception quality of the first terminal can be guaranteed. Furthermore, the first terminal has an active state and a dormant state. In the dormant state, the first terminal does not need to monitor the PSCCH, so the purpose of saving power for the first terminal can be achieved.

In a possible implementation manner, taking the first terminal including the media access control MAC layer and the physical layer PHY as an example, the first terminal sensing side link resources includes: the MAC layer sends a sensing indication to the PHY and using For the information indicating the first time period, the perception indication is used to notify the PHY to perceive the side link resource. The first terminal determining the information of the candidate side link resource located in the first time period includes: the PHY determines the candidate side link resource located in the first time period from the sensed side link resources Resource information, the PHY reports the candidate side link resource information to the MAC layer.

In a possible implementation manner, the first terminal adopts a discontinuous reception DRX mechanism, the DRX mechanism includes an active period and a sleep period, and the MAC layer sends a perception indication and information for indicating the first time period to the PHY, Including: the MAC layer sends a perception indication and information for indicating a first time period to the PHY at a first time, the first time is in the dormant period, and the first time is before the first time period, so The first time period is within the activation period. It is understandable that the active period of the first time period and the dormant period of the first moment are in different DRX cycles, for example, the dormant period is the dormant period in the first DRX cycle, and the first time period The active period is the active period in the second DRX cycle. The first DRX cycle is located before the second DRX cycle. Optionally, the first DRX cycle is adjacent to the second DRX cycle. Use the sensing indication to trigger the PHY to start resource sensing, so as to prevent the first terminal from being in the resource sensing state all the time. In this solution, before the start of the activation period in the second DRX cycle, the MAC layer of the first terminal notifies the PHY layer to start sensing side link resources and instructs the PHY to report the side link in the activation period in the second DRX cycle Road resources are used as candidate side link resources.

In a possible implementation manner, that the first terminal sends the first information to the second terminal includes: the first terminal sends the first information to the second terminal at the second time. The second time is in the sleep period, and the second time is before the first time period. Ensure the timeliness of the first information.

In a possible implementation manner, the first terminal adopts a discontinuous reception DRX mechanism. The DRX mechanism includes an active period and a dormant period. The MAC layer sends a perception indication and information for indicating the first time period to the PHY, including: MAC The layer sends a perception indication and information for indicating the first time period to the PHY at the first moment, and the first terminal is in an active state at the first moment. The first time period is the timing duration of the first timer of the first terminal, and the first timer is used to maintain the activated state of the first terminal. Since the first terminal maintains the active state of the first terminal during the running period of the first timer, the first terminal can detect service data during the running time of the first timer. Therefore, it is convenient for the first terminal to use the first information to send the second terminal to the second terminal. The terminal indicates the side link resources that are located within the running time of the first timer after the activation period.

In a possible implementation manner, the method provided in the embodiment of the present application further includes: during the operation of any timer corresponding to the active state of the first terminal, the first terminal starts the first timer at the first moment. The first moment is the moment when the first terminal successfully demodulates the PSCCH scheduling signal of the physical side uplink control channel in the active state. The PSCCH scheduling signal can be used to schedule newly transmitted data transmitted on the side link between the first terminal and the second terminal. At this time, the first terminal will monitor the newly transmitted data from the second terminal during the operation of the first timer. Business data. 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: when the second timer expires, the first terminal starts the first timer, and the first terminal monitors service data during the operation of the first timer The first time is the time when the first timer is started, and the second timer represents the minimum waiting time before the first terminal starts to receive the retransmitted data of the service data. At this time, the first terminal will keep monitoring the retransmitted service data from the second terminal during the running of the first timer. For example, the first timer is drx-RetransmissionTimerSL.

Starting the first timer in the above solution means that the range of the side link resource information provided by the first terminal using the first information to the second terminal is expanded, and the first terminal's ability to receive service data from the second terminal is also expanded. The range of side link resources.

In a possible implementation manner, the method provided in the embodiment of the present application further includes: during the operation of any timer corresponding to the active state, if the PSCCH scheduling signal is not successfully demodulated, the first terminal starts the first terminal. Two timers. The PSCCH can schedule retransmission data to be transmitted on the 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: when the first terminal is in an active state, if the first terminal receives the side link discontinuous reception command MAC CE, the first terminal Stop sensing side link resources. Alternatively, 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 service data during the activation period or before the first timer expires, then the first terminal A terminal stops sensing side link resources.

In a possible implementation manner, the method provided in the embodiment of the present application further includes: when the first terminal is in an active state, at the moment when the first terminal receives the side link discontinuous reception command MAC CE, A terminal stops sensing side link resources.

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 service data during the activation period or before the first timer expires, then the first terminal Stop sensing the side link resources at the end of the activation period or when the first timer expires.

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

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

In a possible implementation manner, the first terminal sending the first information to the second terminal includes: before the first timer expires and before the side link resource fails, the first terminal sends the first information to the second terminal Send the first message. Ensure the effectiveness of side link resources.

In a possible implementation manner, the quality of the side link resource is greater than or equal to a preset threshold, or the side link resource is determined by the channel busy rate CBR of the candidate side link resource, and/or , The side link resource is determined by the number of resources 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 service data from the second terminal on the target side link resource. The target side link resource belongs to the side link 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 side link resource. The method includes: a second terminal receives information from a first terminal, where the first information is used to indicate the side link resource. The second terminal selects the target side link resource from the side link resources to send the service data.

In the third aspect, the embodiments of the present application provide a communication device, which can implement the first aspect or any possible implementation method of the first aspect, and therefore can also implement any possible implementation of the first aspect or the first aspect. The beneficial effect in the realization method. The communication device may be a first terminal, or a device that supports the first terminal to implement the first aspect or any possible implementation of the first aspect, for example, a chip applied to the first terminal. The communication device can implement the above method by software, hardware, or by hardware executing corresponding software. As an example, an embodiment of the present application provides a communication device, and the communication device includes:

In an example, the communication device is a first terminal or a chip or a chip system applied to the first terminal, the first terminal has an active state and a sleep state, and the communication device includes: a processing unit for sensing side lines Link resources. The processing unit is configured to determine information about candidate side link resources in a first time period in which the first terminal is in an active state. The communication unit is configured to send first information to the second terminal, where the first information is information for indicating side link resources, and the side link resources are all or part of the candidate side link resources. Uplink resources.

In a possible implementation manner, taking the first terminal including the media access control MAC layer and the physical layer PHY as an example, the processing unit is configured to sense side link resources, including: the MAC layer sends a sense indication to the PHY And information used to indicate the first time period, and the sensing indication is used to notify the PHY to sense the side link resource. The processing unit is configured to determine information about candidate side link resources located in the first time period, including: PHY determines the candidate side link resources located in the first time period from the sensed side link resources Link resource information, the PHY reports the candidate side link resource information to the MAC layer.

In a possible implementation manner, the first terminal adopts a discontinuous reception DRX mechanism. The DRX mechanism includes an active period and a dormant period. The MAC layer sends a perception indication and information for indicating the first time period to the PHY, including: The MAC layer sends a perception indication and information for indicating the first time period to the PHY at the first time, the first time is within the dormant period, and the first time is before the first time period, the first time A time period is within the activation period. It is understandable that the active period of the first time period and the dormant period of the first moment are in different DRX cycles, for example, the dormant period is the dormant period in the first DRX cycle, and the first time period The active period is the active period in the second DRX cycle. The first DRX cycle is located before the second DRX cycle. Optionally, the first DRX cycle is adjacent to the second DRX cycle. Use the sensing indication to trigger the PHY to start resource sensing, so as to prevent the first terminal from being in the resource sensing state all the time. In this solution, before the start of the activation period in the second DRX cycle, the MAC layer of the first terminal notifies the PHY layer to start sensing side link resources and instructs the PHY to report the side link in the activation period in the second DRX cycle Road resources are used as candidate side link resources.

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 in the sleep period, and the second time is before the first time period.

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

In a possible implementation manner, when the second timer expires, the processing unit is configured to start the first timer, and the first terminal monitors the retransmission data of the service data during the operation of the first timer. In order to start the first timer, the second timer indicates the minimum waiting time before the first terminal starts to receive the retransmitted data of the service data. At this time, the first terminal will keep monitoring the retransmitted service data from the second terminal during the running of the first timer. For example, the first timer is drx-RetransmissionTimerSL.

In a possible implementation manner, during the operation of any timer 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 can schedule retransmission data to be transmitted on the 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: when the first terminal is in an active state, if the communication unit receives the side link discontinuous reception command MAC CE, the processing unit uses Stop sensing side link resources. Or, in a possible implementation manner, during the activation period or before the first timer expires, the communication unit does not receive the PSCCH scheduling signal for scheduling service data, and the processing unit is configured to stop sensing the side link resource.

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

In a possible implementation manner, if the communication unit does not receive the PSCCH scheduling signal for scheduling service data during the activation period or before the first timer expires, the processing unit is configured to: Stop sensing side link resources when the timer expires.

In a possible implementation manner, when the third timer expires and the first timer is running, if the communication unit does not receive the PSCCH scheduling signal for continuing to schedule service data, when the first timer expires, the processing unit uses Stop sensing side link resources. Or, during the running of the first timer, the communication unit receives the side link discontinuous reception command MAC CE, and the processing unit is configured to stop sensing the side link resources.

In a possible implementation manner, the processing unit is configured to stop sensing side link resources, including: the processing unit sends a stop sensing instruction to the processing unit through the PHY of the first terminal through the MAC layer, and the PHY of the first terminal is based on the PHY of the first terminal. The stop sensing instruction is to stop sensing the side link resources. Or, in a possible implementation manner, the processing unit configured to stop sensing the side link resource includes: the processing unit automatically stops sensing the side link resource 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 side link resource fails. Ensure the effectiveness of side link resources.

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

Exemplarily, when the communication device is a chip or a chip system in the first terminal, the processing unit may be a processor, and the communication unit may be a communication interface. For example, the communication interface can be an input/output interface, a pin, or a circuit. The processing unit executes the instructions stored in the storage unit, so that the first terminal implements the method for determining the side link resource described in the first aspect or any one of the possible implementation manners of the first aspect. The storage unit may be a storage unit in the chip (for example, a register, a cache, etc.), or a storage unit in the first terminal located outside the chip (for example, a read-only memory, a random access memory, etc.).

In a fourth aspect, an embodiment of the present application provides a communication device that can implement the second aspect or any possible implementation method of the second aspect, and therefore can also implement any possible implementation of the second aspect or the second aspect. The beneficial effect in the realization method. The communication device may be a second terminal, or 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 to the second terminal. The communication device can implement the above method by software, hardware, or by hardware executing corresponding software.

As an example, an embodiment of the present application provides a communication device. The communication device includes: a communication unit configured to receive information from a first terminal, where the first information is used to indicate a side link resource. The communication unit is used to select the target side link resource from the side link resource to send the service data.

Exemplarily, when the communication device is a chip or a chip system in the second terminal, the processing unit may be a processor, and the communication unit may be a communication interface. For example, the communication interface can be an input/output interface, a pin, or a circuit. The processing unit executes the instructions stored by the storage unit, so that the second terminal implements the method for determining the side link resource described in the second aspect or any one of the possible implementation manners of the second aspect. The storage unit may be a storage unit in the chip (for example, a register, a cache, etc.), or a storage unit in the second terminal located outside the chip (for example, a read-only memory, a random access memory, etc.).

In the fifth aspect, the embodiments of the present application provide a computer-readable storage medium. The computer-readable storage medium stores a computer program or instruction. When the computer program or instruction runs on a computer, the computer executes the operations as described in the first aspect to the first aspect. A method for determining side link resources described in any one of the possible implementation manners on the one hand. The computer may be the first terminal.

In the sixth aspect, the embodiments of the present application provide a computer-readable storage medium. The computer-readable storage medium stores a computer program or instruction. When the computer program or instruction runs on a computer, the computer executes the operations as described in the second aspect to the first aspect. A method for determining side link resources described in any one of the possible implementation manners of the second aspect. The computer may be the second terminal.

In a seventh aspect, the embodiments of the present application provide a computer program product including instructions. When the instructions run on a computer, the computer executes the first aspect or a certain side described in the various possible implementations of the first aspect. The method of uplink resources.

In an eighth aspect, the embodiments of the present application provide a computer program product including instructions. When the instructions run on a computer, the computer executes the second aspect or a certain side described in various possible implementations of the second aspect. The method of uplink resources.

In a ninth aspect, the embodiments of the present application provide a communication device for implementing various methods in various possible designs of any one of the foregoing first aspect to the second aspect. The communication device may be the aforementioned first terminal, or a device including the aforementioned first terminal, or a component (for example, a chip) applied to the first terminal. Alternatively, the communication device may be the foregoing second terminal, or a device including the foregoing second terminal, or the communication device may be a component (for example, a chip) applied to the second terminal. The communication device includes modules and units corresponding to the foregoing methods. The modules and units can be implemented by hardware, software, or hardware execution of corresponding software. The hardware or software includes one or more modules or units corresponding to the above-mentioned functions. It should be understood that the communication device described in the ninth aspect may further include a bus and a memory, and the memory is used to store code and data. Optionally, 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 device, and the communication device includes: at least one processor. Wherein, at least one processor is coupled to the memory, and when the communication device is running, the processor executes the computer-executable instructions or programs stored in the memory, so that the communication device executes any one of the first aspect or the first aspect described above. Aspects of any of the various possible designs. 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 device, and the communication device includes: at least one processor. Wherein, at least one processor is coupled with the memory, and when the communication device is running, the processor executes the computer-executable instructions or programs stored in the memory, so that the communication device executes any one of the second aspect or the second aspect described above. Aspects of any of the various possible designs. For example, the communication device may be a 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 also be replaced with a storage medium, which is not limited in the embodiment of the present application.

In a possible implementation manner, the memory described in any one of the tenth aspect to the eleventh aspect may be a memory inside the communication device. Of course, the memory may also be located outside the communication device, but at least one processor is still The computer-executable instructions or programs stored in the memory can be executed.

In a twelfth aspect, an embodiment of the present application provides a communication device. The communication device includes one or more modules for implementing the method of any one of the above-mentioned first and second aspects. The one or more modules It may correspond to each step in the method of any one of the above-mentioned first aspect and second aspect.

In a thirteenth aspect, an embodiment of the present application provides a chip system that includes a processor, and the processor is configured to read and execute a computer program stored in a memory to execute the first aspect and any possible implementation manners thereof method. Optionally, the chip system may be a single chip or a chip module composed of multiple chips. Optionally, the chip system further includes a memory, and the memory and the processor are connected to the memory through a circuit or a wire. Further optionally, the chip system further includes a communication interface. The communication interface is used to communicate with other modules outside the chip.

In a fourteenth aspect, an embodiment of the present application provides a chip system that includes a processor, and the processor is configured to read and execute a computer program stored in a memory to execute the second aspect and any possible implementation manners thereof method. Optionally, the chip system may be a single chip or a chip module composed of multiple chips. Optionally, the chip system further includes a memory, and the memory and the processor are connected to the memory through a circuit or a wire. Further optionally, the chip system further includes a communication interface. The communication interface is used to communicate with other modules outside the chip.

In a fifteenth aspect, an embodiment of the present application provides a communication system, which includes: a first terminal and a second terminal. The first terminal is used to execute the method in the first aspect and any possible implementation manners thereof, and the second terminal is used to execute the method in the second aspect and any possible implementation manners thereof.

Any device or computer storage medium or computer program product or chip or communication system provided above is used to execute the corresponding method provided above. Therefore, the beneficial effects that can be achieved can refer to the corresponding method provided above The beneficial effects of the corresponding solutions in the method will not be repeated here.

Description of the drawings

FIG. 1 is a system architecture diagram of a communication system provided by an embodiment of this application;

FIG. 2 is a structural diagram of a communication device provided by an embodiment of this application;

FIG. 3 is a schematic diagram of resource awareness provided by an embodiment of this application;

FIG. 4 is a schematic diagram of resource distribution provided by an embodiment of this application;

FIG. 5a is a schematic diagram of a DRX cycle provided by an embodiment of this application;

FIG. 5b is a schematic diagram of a time domain location where a side link resource selected by a terminal according to an embodiment of the application is located;

6 and FIG. 7 are schematic flowcharts of a method for determining side link resources according to an embodiment of this application;

8 to 11 are schematic diagrams of determining side link resources by the receiving terminal in different situations provided by the embodiments of the application;

FIG. 12 is a schematic structural diagram of a communication device provided by an embodiment of this application;

FIG. 13 is a schematic structural diagram of a chip provided by an embodiment of the application.

Detailed ways

In order to clearly describe the technical solutions of the embodiments of the present application, in the embodiments of the present application, words such as "first" and "second" are used to distinguish the same items or similar items that have substantially the same function and effect. For example, the first terminal and the second terminal are only used to distinguish different terminals, and the sequence of the terminals is not limited. Those skilled in the art can understand that words such as "first" and "second" do not limit the quantity and order of execution, and words such as "first" and "second" do not limit the difference.

It should be noted that in this application, words such as "exemplary" or "for example" are used to indicate examples, illustrations, or illustrations. Any embodiment or design solution described as "exemplary" or "for example" in this application should not be construed as being more preferable or advantageous than other embodiments or design solutions. To be precise, words such as "exemplary" or "for example" are used to present related concepts in a specific manner.

The technical solution of this application can be applied to various communication systems, such as: long time evolution (LTE) system, LTE frequency division duplex (FDD) system, LTE time division duplex (TDD) ) System, universal mobile telecommunication system (UMTS), worldwide interoperability for microwave access (WiMAX) communication system, public land mobile network (PLMN) system, device-to-device (device to device, D2D) network system or machine to machine (machine to machine, M2M) network system, 5G communication system, car networking system, etc.

The network architecture and business scenarios described in the embodiments of this application are intended to more clearly illustrate the technical solutions of the embodiments of this application, and do not constitute a limitation on the technical solutions provided in the embodiments of this application. Those of ordinary skill in the art will know that with the network With the evolution of architecture and the emergence of new business scenarios, the technical solutions provided in the embodiments of the present application are equally applicable to similar technical problems. In the embodiments of the present application, the method provided is applied to an NR system or a 5G network as an example for description.

In this application, "at least one" refers to one or more, and "multiple" refers to two or more. "And/or" describes the association relationship of the associated objects, indicating that there can be three relationships, for example, A and/or B, which can mean: A alone exists, A and B exist at the same time, and B exists alone, where A, B can be singular or plural. The character "/" generally indicates that the associated objects before and after are in an "or" relationship. "The following at least one item (a)" or similar expressions refers to any combination of these items, including any combination of a single item (a) or a plurality of items (a). For example, at least one of a, b, or c can mean: a, b, c, ab, ac, bc, or abc, where a, b, and c can be single or multiple . The mapping and association in this article can have the same meaning.

Before introducing the embodiments of this application, first introduce the terms involved in the embodiments of this application:

1). Sidelink (SL) refers to: defined for the direct communication between the terminal and the terminal. That is, the link between the terminal and the terminal for direct communication without forwarding through the base station.

2) The sidelink resource refers to the resource used when transmitting sidelink service data (including data packets and control signaling) on the sidelink between terminals. The side link service data in the embodiment of the present application may also be referred to simply as: service data or V2X service.

3) A schematic diagram of a discontinuous reception (DRX) mechanism is shown in Figure 5a. In the time domain, time is divided into successive DRX cycles (DRX cycles). The DRX cycle includes an active period (timed by drx-Ondurationtimer) and a sleep period. During the activation period, the terminal device listens to the physical downlink control channel (PDCCH). During the sleep period, the terminal neither listens nor receives downlink signals to save power consumption.

4) The activation period refers to the time when the drx-Ondurationtimer is running at the beginning of a DRX cycle defined in the standard, and the terminal is in the active state during the activation period.

5) The dormant period refers to the time after the drx-Ondurationtimer expires in a DRX cycle defined in the standard, and the terminal is in the dormant state during the dormant period.

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

Among them, the activation state of a terminal includes the activation state of the terminal during the activation period. Or the active state of a terminal includes the active state of the terminal during the active period and the active state within a time corresponding to the timing of other timers that maintain the active state.

It is worth noting that if the terminal does not have other timers that maintain the active state to start, the active state is the state the terminal is in during the active period. The dormant state is the state of the terminal during the dormant period.

If the terminal has other timers that maintain the active state, the active state of the terminal includes not only the active state of the terminal during the active period, but also the active state within the time corresponding to the timing of other timers that maintain the active state.

7) In the dormant state, the terminal cannot monitor service data (may be able to monitor other data, such as sensing side link resources in the dormant state in this application), and the terminal does not perform PDCCH or PSCCH detection in the dormant state to save power.

The dormant state is the state of the terminal during the dormant period minus the duration of other timers that maintain the active state.

In order to improve the safety and intelligence of the transportation system, the system concept of intelligent transportation is gradually emerging. In the recent stage, the development of intelligent transportation systems will mainly focus on the field of intelligent highway transportation systems, which is commonly known as the vehicle to everything (V2X). V2X communication includes vehicle-to-vehicle (V2V) communication, vehicle-to-roadside infrastructure (V2I) communication, and vehicle-to-people (V2P) communication. V2X applications will improve driving safety, reduce congestion and vehicle energy consumption, and improve traffic efficiency. For example, communication with facilities such as traffic lights, campuses, and railway crossings. The Internet of Vehicles system is a side-link transmission technology based on Long Term Evaluation (LTE) V2V or New Air Interface V2V. It is different from the traditional LTE system or the way in which communication data in NR is received or sent through network equipment. The Internet of Vehicles The system adopts terminal-to-terminal direct communication.

Based on the foregoing description, FIG. 1 shows a schematic structural diagram of a communication system (also referred to as a V2V communication system) provided by an embodiment of the present application. The communication system includes a terminal 10 and a terminal 20. It should be understood that one terminal 10 and a terminal 20 are shown in FIG. 1.

Wherein, there is a first interface for direct communication between the terminal 10 and the terminal 20, and the first interface may be referred to as a PC5 interface. The transmission link used for the communication between the terminal 10 and the terminal 20 on the PC5 interface may be referred to as a side link.

For example, the PC5 interface can use a dedicated frequency band (such as 5.9 GHz).

The aforementioned terminal 10 and terminal 20 may communicate on the side link between the terminal 10 and the terminal 20 through resources. In the embodiment of the present application, the scenario in which the terminal 10 and the terminal 20 communicate on the side link may be referred to as a sidelink communication scenario. As an example, in the embodiment of the present application, the terminal 10 and the terminal 20 may be connected on the side link. The resources used for communication on the road are called side link resources. The embodiment of the present application does not limit the specific names of the resources, and can be set as required.

Taking the terminal 10 using the side link resources to send side link service data to the terminal 20 as an example, the terminal 10 can currently obtain the side link resources in the following manner. The manner in which the terminal 20 obtains the side link resource may refer to the manner in which the terminal 10 obtains the side link resource, which will not be described in detail in the following.

Mode 1 (mode1), the resource allocation mode of network scheduling.

Mode 1: The terminal 10 performs data transmission with the network device in the radio resource control (RRC) connection state, then the network device that communicates with the terminal 10 can schedule the terminal 10 for the transmission side link Side link resources for business data. For example, the terminal 10 sends a scheduling request (scheduling request, SR) and a sidelink buffer status report (buffer status report, BSR) to the network device. Among them, the sidelink BSR is used to determine the amount of sidelink communication data of the terminal 10. Based on the sidelink BSR, the network device can determine the amount of sidelink communication data of the terminal 10, and schedule the sidelink resources required for the terminal 10 to transmit sidelink service data. Among them, the network device uses the configured sidelink radio network temporary identity (SL-RNTI) to schedule sidelink resources for sidelink communication.

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

mode2, the terminal 10 selects a sidelink resource from a resource pool (usually including one or more sidelink resources). For example, when the terminal 10 is in the network coverage area, the resource pool is broadcast by the network device in the system information. When the terminal 10 is outside the network coverage, the resource pool may be a resource pool pre-configured for the terminal 10. The resource pool may be a specific resource pool for the terminal 10, that is, only the terminal 10 can select the side link resource in the resource pool. Or the resource pool may be a resource pool shared by multiple 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, when the terminal 10 autonomously selects the sidelink resource in the resource pool, the terminal 10 can perform sensing on the resource pool to select the sidelink resource.

The sidelink transmission is based on the resource pool. The so-called resource pool is a logical concept. A resource pool includes multiple physical resources, and any one of the physical resources is used to transmit business data. When a terminal transmits service data to another terminal, it can select sidelink resources from the resource pool for transmission.

Specifically, in order to ensure the quality of the sidelink resources used by the service data sent by the terminal 10, avoid resource collisions caused by multiple terminals randomly selecting sidelink resources in the resource pool when the terminal 10 autonomously selects sidelink resources. That is, the sidelink resources selected by the terminal 10 are prevented from being occupied by other terminals, thereby reducing the communication quality. Then the terminal 10 can predict the occupancy of the side link resources in a certain time period 1 in the future through a sensing method, and use the occupancy of the side link resources in a certain time period 1 as the sensing result. Wherein, the time period 1 may be a time period when the terminal 10 has service data to be sent. The so-called occupancy of side link resources may refer to whether other terminals occupy the side link resources in this time period 1 in the future. Therefore, based on the sensing result, the terminal 10 can reserve the corresponding sidelink resource in the sensing result to ensure its own communication quality. In addition, the side link resources reserved by the terminal 10 through sensing are time-effective. For example, in 5G NR, the time-efficiency of the sensing results of periodic services and the sensing results of aperiodic services is different, and both can be based on the network The device is determined by the configuration of the resource pool, and they are all within a certain millisecond time.

In V2X communication based on LTE or NR, the terminal 10 may use or be based on the sensing process defined in the LTE Release 14 standard protocol to obtain the sensing result. Exemplarily, the sensing result of the side link resource may be used to indicate any one or more of the following: the identification or location of the specific side link resource in the resource pool, and the signal strength on the side link resource , The signal power on the side link resource, and the channel busy ratio (CBR) of the side link resource.

As shown in Fig. 1, Fig. 1 shows a scenario provided by an embodiment of the present application. As shown in Fig. 1, taking the terminal 10 as the vehicle identified as X (abbreviated as vehicle X) as an example, if vehicle X decides to execute For an overtaking operation, vehicle X can send the business data in the dialog box 30 (for example, business data It may be an overtaking instruction, the current speed of vehicle X (for example, 75km/h), so that vehicle Y will slow down after receiving X's current speed and overtaking instruction, so that X can overtake safely. Before the terminal 10 sends service data to the terminal 20, the terminal 10 may select side link resources from the sending resource pool.

Based on this, when the terminal 10 sends service data to the terminal 20, the terminal 20 can perform sensing on the receiving resource (that is, the sidelink resource used to receive the service data of other terminals) in the receiving resource pool (that is, the above sending resource pool), And through the auxiliary information, the information of the received resource with better communication quality in the receiving resource pool is sent to the terminal 10 as auxiliary information, so that the terminal 10 can consider the information of the received resource sent by the terminal 20 when selecting resources, thereby improving the terminal 10. The reception quality of the service data received from the terminal 20.

It is worth noting that the side link resources included in the sending resource pool and the receiving resource pool in the embodiment of the present application may be partly the same or all of the same. The sending resource pool and the receiving resource pool are a relative concept. If the terminal 10 selects the side link resource in the resource pool 1 to send service data to the terminal 20, then the resource pool 1 is the sending resource pool for the terminal 10. The terminal 20 is a receiving resource pool. In addition, since the terminal 20 itself may also need to send service data, the receiving resource pool is mainly used to distinguish it from the "resource pool used when the terminal 20 is used as a data sender", and the receiving resource pool of the terminal 20 is the terminal 10 The sending resource pool.

The scenario shown in FIG. 1 is only an example, and other scenarios of communication between terminals are also applicable to the solution of this application.

The terminal 10 or the terminal 20 is a device with a wireless communication function, which can be deployed on land, including indoor or outdoor, handheld or vehicle-mounted. It can also be deployed on the water (such as ships, etc.). It can also be deployed in the air (for example, on airplanes, balloons, satellites, etc.). The terminal is also called user equipment (UE), mobile station (MS), mobile terminal (MT), and terminal equipment, etc., which provide users with voice and/or data connectivity. equipment. For example, the terminal includes a handheld device with a wireless connection function, a vehicle-mounted device, and so on. At present, the terminal can be: mobile phone (mobile phone), tablet computer, notebook computer, palm computer, mobile internet device (MID), wearable device (such as smart watch, smart bracelet, pedometer, etc.), In-vehicle equipment (for example, cars, bicycles, electric vehicles, airplanes, ships, trains, high-speed rail, etc.), virtual reality (VR) equipment, augmented reality (AR) equipment, industrial control (industrial control) Wireless terminals, smart home equipment (for example, refrigerators, TVs, air conditioners, electric meters, etc.), smart robots, workshop equipment, wireless terminals in self-driving, wireless terminals in remote medical surgery, and smart Wireless terminals in a smart grid, wireless terminals in transportation safety, wireless terminals in a smart city, or wireless terminals in a smart home, and flying equipment (e.g., smart Robots, hot air balloons, drones, airplanes), etc. In a possible application scenario of this application, the terminal is a terminal that often works on the ground, such as a vehicle-mounted device. In this application, for ease of description, chips deployed in the above-mentioned devices, such as System-On-a-Chip (SOC), baseband chips, etc., or other chips with communication functions may also be referred to as terminals.

The terminal may be a vehicle with corresponding communication function, or a vehicle-mounted communication device, or other embedded communication device, or a user-held 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 devices can also be called wearable smart devices. It is a general term for using wearable technology to intelligently design everyday wear and develop wearable devices, such as glasses, gloves, watches, clothing and shoes. A wearable device is a portable device that is directly worn on the body or integrated into the user's clothes or accessories. Wearable devices are not only a kind of hardware device, but also realize powerful functions through software support, data interaction, and cloud interaction. In a broad sense, wearable smart devices include full-featured, large-sized, complete or partial functions that can be achieved without relying on smart phones, such as smart watches or smart glasses, and only focus on a certain type of application function, and need to cooperate with other devices such as smart phones. Use, such as all kinds of smart bracelets and smart jewelry for physical sign monitoring.

A network device is an entity that can be used to transmit or receive signals in conjunction with a terminal. For example, it can be an access point (AP) in a WLAN, an evolved base station (evolvedNodeB, eNB, or eNodeB) in a long-term evolution (LTE), or a relay station or access point, or a vehicle-mounted device, Wearable devices and fifth-generation mobile networks (5th generation mobile networks or 5th generation wireless systems, 5th-Generation, referred to as: 5G) network (also called New Radio (NR)) network equipment or future Network equipment in the evolved PLMN network, etc. 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 base station (evolved NodeB, eNB or eNodeB) in the 4 Generation mobile communication technology (4G) system. The terminal 200 is a terminal that can perform information transmission with an eNB. As another example, the network device may be the next generation NodeB (gNB) in the NR system, and the terminal 10 or the terminal 20 is a terminal that can perform information transmission with the gNB.

When the solutions described in the embodiments of this application are applied to V2X scenarios, they can be applied to the following fields: unmanned driving, autonomous driving/ADS, driver assistance/ADAS, intelligent driving driving, connected driving, intelligent network driving, car sharing. Of course, the various solutions described in the embodiments of the present application can also be applied to the interaction between the bracelet and the mobile phone, and the VR glasses and the mobile phone.

FIG. 2 shows a schematic diagram of the hardware structure of a communication device provided by an embodiment of the present application. For the hardware structure of the first terminal and the second terminal in the embodiment of the present application, reference may be made to the structure shown in FIG. 2. The communication device includes a processor 21, a communication line 24, and at least one transceiver (in FIG. 2 it is only an example and the transceiver 23 is included as an example for illustration).

The processor 21 may be a general-purpose central processing unit (central processing unit, CPU), a microprocessor, an application-specific integrated circuit (ASIC), or one or more programs for controlling the execution of the program of this application. integrated circuit.

The communication line 24 may include a path to transmit information between the aforementioned components.

The transceiver 23 uses any device such as a transceiver for communication with other devices or communication networks, such as Ethernet, radio access network (RAN), wireless local area networks (WLAN), etc. .

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

The memory 22 may be a read-only memory (ROM) or other types of static storage devices that can store static information and instructions, random access memory (RAM), or other types that can store information and instructions The dynamic storage device can also be electrically erasable programmable read-only memory (EEPROM), compact disc read-only memory (CD-ROM) or other optical disk storage, optical disc storage (Including compact discs, laser discs, optical discs, digital versatile discs, Blu-ray discs, etc.), magnetic disk storage media or other magnetic storage devices, or can be used to carry or store desired program codes in the form of instructions or data structures and can be used by a computer Any other media accessed, but not limited to this. The memory can exist independently and is connected to the processor through the communication line 24. The memory 22 may also be integrated with the processor 21.

The memory 22 is used to store computer-executed instructions for executing the solution of the present application, and the processor 21 controls the execution. The processor 21 is configured to execute a computer-executable instruction stored in the memory 22, so as to implement the method for determining a side link resource provided in the following embodiments of the present application.

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

In a specific implementation, as an embodiment, the processor 21 may include one or more CPUs, such as CPU0 and CPU1 in FIG. 2.

In a specific implementation, as an embodiment, the communication device may include multiple processors, such as the processor 21 and the processor 25 in FIG. 2. Each of these processors can be a single-CPU (single-CPU) processor or a multi-core (multi-CPU) processor. The processor here may refer to one or more devices, circuits, and/or processing cores for processing data (for example, computer program instructions).

Based on the above-mentioned perception, in the actual mode2 resource allocation sidelink transmission and reception scenario, the terminal 10 is used as the sender terminal (Tx UE), and the terminal 20 is used as the receiver terminal (Rx UE) as an example. For communication through the sidelink, before the terminal 10 sends service data to the terminal 20, the terminal 10 can reserve sidelink resources from the resource pool through sensing. Since the sidelink resource is sensed by the terminal 10 in the resource pool, and the available sidelink resource is selected based on the result of its perception of the resource pool, to avoid the sidelink resource selected by it being occupied by other UEs, the terminal 10 can choose a better quality Side link resources, so as to ensure the communication quality of the terminal 10 transmitting service data to the terminal 20. In addition, the terminal 10 may determine the reserved sidelink resource according to the attribute of the service data (for example, periodic service or aperiodic service) and the resource reservation timeliness corresponding to the service data, that is, the sidelink resource is located in the resource corresponding to the service data. Within the reservation time limit, the terminal 10 may not reserve resources outside the resource reservation time limit. For example, when the service data of the terminal 10 is a periodic service, the terminal 10 may reserve resources corresponding to the periodic service and reserve sidelink resources within the aging time. When the service data of the Tx UE is an aperiodic service, the Tx UE can reserve resources corresponding to the aperiodic service and reserve sidelink resources within the time limit. For example, as shown in FIG. 3, taking the resource reservation time t<100ms corresponding to the periodic service as an example, the terminal 10 can reserve sidelink resources within 100ms. Taking the resource reservation time t<32ms corresponding to aperiodic services as an example, the terminal 10 can reserve sidelink resources within 32ms.

The resource reservation timeliness corresponding to the service data in the embodiment of the present application may refer to: the effective time range of the side link resource, that is, in which time period the side link resource is valid and in which time period is invalid. If the side link resource is valid in the time period A or before the time point A, the terminal 10 may use the side link to send the service data in the time period A or before the time point A. If the side link resource is invalid outside the time period A or after the time period A, the terminal 10 cannot use the side link resource to send service data.

In order to further improve the communication quality of the service data received by the Rx UE in the mode2 resource allocation, for the sidelink communication scenario described above, when the terminal 10 sends service data to the terminal 20, the terminal 20 may also provide auxiliary information for the terminal 10. Here, the terminal 20 provides the auxiliary information because the terminal 10 mainly selects the side link resource from its own point of view, and does not consider whether the selected side link resource is also applicable to the terminal 20. Specifically, the location of the terminal 10 and the terminal 20 are different. However, due to the different positions of the two, terminal 10 and terminal 20 may experience different interference on the same sidelink resource. For example, terminal 10 and terminal 20 may have different measurements on the same channel due to their different positions. The CBR is different, that is, the communication quality of the two on the same side uplink resource is different. For example, as shown in Fig. 4, the terminal 10 and the terminal 20 perform sensing on the same resource pool. In actual situations, the time-frequency resource 1 in the resource pool has been occupied by the terminal a, and the time-frequency resource 2 has been occupied by the terminal b. The terminal 20 is relatively close 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 occupancy is: time-frequency resource 1 and time-frequency resource 2 are both Occupied. The distance between the terminal 10 and the terminal a is relatively short, but the distance between the terminal 20 and the terminal b is relatively long, so there may be the following situation: the terminal 10 can detect the signal transmitted by the terminal a, but does not detect the signal transmitted by the terminal b Signal, for the terminal 10 at this time, the occupancy of the resource pool is: time-frequency resource 1 is occupied. It can be seen that, due to the different locations of the terminal 10 and the terminal b, the communication quality of different terminals on the same resource may be different. If the terminal 10 subsequently selects the time-frequency resource 2 as the side link resource to send service data to the terminal 20, the quality of the service data received by the terminal 20 may be affected.

At present, when the terminal communicates with the 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 the Uu port (the interface between the terminal and the network device) to help in the wireless resource Control (radio resource control, RRC) connected terminal energy saving. The basic principle of DRX is: when a terminal communicates with a network device, the network device may have data transmission for a period of time, and the network device may have no data to transmit to the terminal for a long period of time. In the case that the network device does not transmit data to the terminal, if the terminal is still in the listening state, it is very power consuming for the terminal. Therefore, when the terminal does not receive data, the terminal can stop monitoring the physical downlink control channel (PDCCH) to reduce the power consumption of the terminal, thereby increasing the battery life of the terminal.

Specifically, when the terminal adopts the DRX mechanism, the terminal is configured with a DRX cycle (cycle), as shown in Figure 5a, the DRX cycle includes two time periods: an active period (on duration) and a sleep period (opportunity for DRX) ( It can also be called: inactive period). During on duration, the terminal monitors the physical downlink control channel (PDCCH), that is, the time period during which the terminal monitors the PDCCH channel is called the activation period. During the activation period, the terminal will turn on the receiver. The activation period can be regarded as an unchanging concept. In "opportunity for DRX", although the terminal does not monitor the PDCCH, the terminal can send information (such as the first information in this application or send service data to other terminals or send service data to the base station) and sense side link resources and Select the side link resource. When there is no data transmission, the terminal can turn off the receiver, thereby reducing the power consumption of the terminal. It can be seen from Figure 5a that the longer the time used for DRX sleep, the lower the power consumption of the terminal.

In addition, the active state includes the time period during which other DRX-related timers are in the working state and the receiver should be turned on. Other timers refer to DRX duration timer (drx-onDurationTimer), or DRX inactivity timer (drx-InactivityTimer) or DRX downlink retransmission timer (drx-RetransmissionTimerDL) or DRX uplink retransmission timer (drx-RetransmissionTimerUL) ) Or random access contention resolution timer (ra-ContentionResolutionTimer) is running.

ra-ContentionResolutionTimer refers to the timer used by the terminal in the random access process, which is used for the terminal to wait to obtain the access resource of the base station) in any timer (timer) running. For example, when the DRX duration timer, or the DRX inactive timer, or the DRX downlink retransmission timer or the DRX uplink retransmission timer is running, the terminal is in an active state. In other words, the DRX duration timer, or DRX inactive timer, or DRX downlink retransmission timer (drx-RetransmissionTimerDL) or DRX uplink retransmission timer (drx-RetransmissionTimerUL) is running during the running period of the terminal in the DRX active period ( active time), in other words, the active period can also be regarded as the time during which the terminal is in the active state, and the terminal needs to perform blind detection on the PDCCH during the active period.

In addition to the above description of the DRX cycle, the DRX mechanism configured by the network device for the terminal also includes the corresponding DRX parameters. For example, in the 5G NR version, the parameters and the functions of the parameters mainly included in the DRX mechanism are as follows:

DRX duration timer (drx-onDurationTimer): At the beginning of the DRX cycle, the duration of the on-duration can be regarded as the terminal being in an active state (also known as the wake-up state) during the operation of the DRX-duration timer.

DRX slot offset (drx-SlotOffset): the delay before drx-onDurationTimer is turned on.

DRX inactivity timer (drx-InactivityTimer): When the terminal successfully decodes a PDCCH scheduled for the initial transmission of new data on a Uu port, the duration of time that it continues to be in the active state, that is, when the terminal is scheduled, the drx-InactivityTimer should be turned on to To extend the time that the terminal is in the active state, the corresponding scenario can be understood as when the terminal is currently scheduled, it is likely to continue to be scheduled in the next time period, so the terminal needs to remain in the active state to wait to receive data.

DRX downlink retransmission timer (drx-RetransmissionTimerDL) (for each downlink hybrid automatic repeat request (HARQ) process except the broadcast process): the maximum value before the terminal receives the downlink retransmission data from the Uu port For the duration, during the operation of the drx-RetransmissionTimerDL, the terminal waits to receive downlink retransmission data from the network device.

DRX uplink retransmission timer (drx-RetransmissionTimerUL) (for each uplink HARQ process): The maximum duration before the terminal receives the uplink retransmission resource of the Uu port. During the operation of the drx-RetransmissionTimerUL, the terminal performs uplink data retransmission. pass.

DRX Long Cycle Start Offset (drx-LongCycleStartOffset): Represents long DRX cycle (Long DRX Cycle) and drx start offset (drx-StartOffset), where Long DRX Cycle specifies the number of subframes occupied by the long cycle/millisecond, drx-StartOffset Specify the starting subframe of the long DRX cycle and the short DRX cycle.

DRX short cycle (drx-ShortCycle) (optional): the time length of the short DRX cycle (Short DRX cycle), the unit is subframe/ms.

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

DRX downlink HARQ round trip timer (drx-HARQ-RoundTripTime-TimerDL, drx-HARQ-RTT-TimerDL) (for each downlink HARQ process except the broadcast process): The terminal expects to receive downlink HARQ retransmission data on the Uu port The previous duration can be understood as a time window during which the base station will not perform downlink retransmission for the data packet that has failed the current transmission. It needs to wait for the drx-HARQ-RTT-TimerDL to expire before the terminal can continue to receive the data packet. Downlink retransmission of data packets. When the terminal's drx-HARQ-RTT-TimerDL times out, the terminal can start to receive downlink retransmission data, and then drx-RetransmissionTimerDL is turned on.

DRX uplink HARQ round-trip timer (drx-HARQ-RTT-TimerUL) (for each uplink HARQ process): the duration before the terminal expects to receive uplink HARQ retransmission resources on the Uu port, which can be understood as a time window. Within the time window, the terminal cannot perform uplink retransmission of the data packet that currently fails to be transmitted. It needs to wait for the drx-HARQ-RTT-TimerUL to expire before the terminal can continue to upload the data of the data packet. When the terminal's drx-HARQ-RTT-TimerUL times out, the terminal can start uplink retransmission, and then the drx-RetransmissionTimerUL is turned on.

Therefore, after the terminal is configured with the DRX mechanism, the terminal being in the DRX active period (active time) mainly includes the following situations:

Case 1. Any one of the drx-onDurationTimer or drx-InactivityTimer or drx-RetransmissionTimerDL or drx-RetransmissionTimerUL or the random access contention resolution timer (ra-ContentionResolutionTimer) is running. Among them, ra-ContentionResolutionTimer refers to the timer used by the terminal in the random access process for the terminal to wait for the access resource of the base station.

It should be noted that, for the above situation 1, if only the drx-onDurationTimer is timed in the above-mentioned timer, and the other timers are not timed, that is, the activation state of the terminal in the embodiment of the present application may refer to the state of the terminal during the activation period.

When drx-InactivityTimer, drx-RetransmissionTimerDL or drx-RetransmissionTimerUL is running, it can be considered that the active state of the terminal is extended, that is, drx-InactivityTimer, drx-RetransmissionTimerDL or drx-RetransmissionTimerUL are timers that extend the active state of other terminals. At this time, that is, the activation state of the terminal in the embodiment of the present application may refer to the state of the terminal during the activation period of the terminal and the operation period of each of the above-mentioned timers.

Case 2. The terminal has sent a scheduling request (scheduling request, SR) on the physical uplink control channel (PUCCH), and the SR is currently in the pending state. Pending can be understood as the terminal preparing but not sending The network device sends an SR.

Case 3. Similar to ra-ContentionResolutionTimer, the terminal successfully receives a random access response (RAR) for the preamble of a contention-based random access that is not selected by the terminal, but no indication is received Initial transmission (using cell radio network temporary identifier (cell radio network temporary identifier, C-RNTI) PDCCH).

Correspondingly, in any one or more of the above three cases, the terminal needs to detect the PDCCH, where detecting the PDCCH includes detecting the PDCCH corresponding to the following radio network temporary identifier (RNTI): cell RNTI ( cell-RNTI, C-RNTI), configured scheduling-RNTI (configured scheduling-RNTI, CS-RNTI), interrupt RNTI (interruption-RNTI, INT-RNTI), slot format indicator-RNTI (slot format indicator-RNTI, SFI-RNTI) , Semi-persistent channel state information RNTI (semi-persistent channel state information, SP-CSI-RNTI), PUCCH transmit power control RNTI (transmit power control-PUCCH-RNTI, TPC-PUCCH-RNTI), PUSCH transmit power control RNTI (transmit power control-PUSCH-RNTI, TPC-PUSCH-RNTI), probe reference signal transmission power control RNTI (transmit power control-sounding reference signal-RNTI, TPC-SRS-RNTI).

In the foregoing, the PDCCH corresponding to the RNTI may refer to scrambling the cyclic redundancy check (cyclic redundancy check, CRC) bits of the DCI carried by the PDCCH with the RNTI.

It should also be noted that, in addition to the foregoing several situations, the aforementioned activation period may also include other situations specified in the future communication protocol, which is not specifically limited in the embodiment of the present application.

When the current side link communication between Tx UE and Rx UE is performed, specific scenarios that can be considered include but are not limited to V2X communication, device to device (D2D), public safety (public safety), and commercial communication ( Commercial) and other sidelink-related communication scenarios, when Rx UE does not use the DRX mechanism, Rx UE continuously monitors the PSCCH sent by Tx UE throughout the entire time period, and Rx UE continues to remain active and can receive scheduling data sent by Tx UE. In some scenarios, such as unicast scenarios or multicast scenarios with feedback, the Rx UE can provide auxiliary information for the resources selected by the Tx UE, and the side link resources indicated in the auxiliary information provided by the Rx UE It can be in the entire time range, that is, the sensing range of the Rx UE is also within the entire time period, which is very power-consuming for the Rx UE. Among them, the unicast scenario refers to: one Tx UE sends service data to one Rx UE, but one Tx UE may establish sidelink connections with multiple Rx UEs at the same time. The multicast scenario is that multiple terminals form a group, and the terminals in the group communicate with each other, and the terminals in the same group can receive all the data or information in the group.

As mentioned above, in the current sidelink communication, the Rx UE continuously detects the PSCCH (the PSCCH can be the PSCCH corresponding to the service data sent by the Tx UE, or it can be detected by the Rx UE during the sensing process of the receiving resource pool in order to provide auxiliary information. PSCCH), even if there is currently no data sent by the Tx UE, the Rx UE does not need to receive service data from the Tx UE, or when the Rx UE does not need to provide auxiliary information to the Tx UE, the Rx UE still remains in the state of continuous monitoring, which will be very costly Rx The power of the UE.

Based on the foregoing shortcomings, in the embodiments of the present application, a DRX mechanism can be configured for the Rx UE, so that the Rx UE is in a dormant period when it does not need to receive service data, thereby avoiding ineffective PSCCH monitoring and reducing the power consumption of the Rx UE.

However, when the Rx UE is configured with the DRX mechanism, the Rx UE only receives service data from the Tx UE during the active period, so as to ensure that the Rx UE can receive service data on the side link resources with better quality during the active period. , The time domain position of the receiving resource indicated in the auxiliary information provided by the Rx UE needs to be within the time period when the terminal is in the active state. In other words, in order for the Rx UE to provide auxiliary information to the Tx UE, the Rx UE does not have to continuously perceive in the entire time range. Since the time domain position of the side link resource indicated by the auxiliary information should be within the time period when the Rx UE is in the active state, Therefore, the Rx UE should also have a certain range for resource perception in order to provide auxiliary information. In addition, since the sensing result is time-sensitive, after the Rx UE has applied the DRX mechanism: How to start sensing to ensure that the time domain position of the side link 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 Figure 5b, the Rx UE selects the side link resource 501 located in the resource sensing window from the sensed side link resources, but the side link resource 501 is located before time 1, and time 1. It refers to the moment when the activation period starts, that is, the side link resource 501 is in the sleep period of the Rx UE and cannot receive service data from the Tx UE, then the side link resource 501 is an invalid sensing result. For another example, the Rx UE selects the side link resource 502 in the resource sensing window from the sensed side link resources, and the side link resource 502 is in the active period of the Rx UE, that is, the side link resource 502 can be used as a resource for the Rx UE to receive service data from the Tx UE, so the side link resource 502 is an effective sensing result. For another example, as shown in Figure 5b, the time period between the Rx UE's resource awareness window and the resource selection window (that is, the X1 time period in Figure 5b) is opportunity for drx. At this time, the Rx UE is in the dormant period, according to its configured In terms of the DRX cycle, the Rx UE will not change from the dormant state to the active state to receive service data during the sleep period, so there is no need to provide auxiliary information. Therefore, the Rx UE can stop sensing the side link resources indicated by the auxiliary information. .

The resource awareness window in the embodiment of the present application refers to the time period during which the receiver terminal or the sender terminal performs sidelink resource awareness.

The resource selection window in the embodiment of the present application refers to the time period during which the receiver terminal or the sender terminal selects the resource for transmitting service data or the resource for receiving service data from the perceived side link resources.

Based on this, the embodiments of this application provide a method for determining side link resources. When the Rx UE has an active state and a sleep state, in order to prevent the Rx UE from providing side link resources that are not within the active time range, this In the solution, the Rx UE perceives side link resources. The Rx UE determines the information of the candidate side link resources in the first time period, and the Rx UE is in the active state in the first time period. Then, the Rx UE provides the Tx UE with the first information used to indicate the information of the side link resources, and the side link resources are all or part of the side link resources among the candidate side link resources. Since the time domain position of the side link resource is within the time period when the Rx UE is in the active state, it can prevent the Rx UE from providing side link resources that are not within the active time range, and the side link resource is Rx The resource recommended by the UE to the Tx UE for sending service data to the Rx UE, so that the data reception quality of the Rx UE can be guaranteed. Furthermore, the Rx UE has an active state and a dormant state. In the dormant state, the Rx UE does not need to monitor the PSCCH, so it can achieve the purpose of saving power for the Rx UE.

Further, in order to reduce the sensing time of the Rx UE in order to provide side link resource information, the medium access control (MAC) layer of the Rx UE may notify the physical layer (PHY) to start sensing. And notify the valid sensing result range corresponding to the current sensing (for example, the first time period).

For the Rx UE that applies the DRX mechanism in the embodiment of the present application, the Rx UE has DRX parameters. In the embodiments of this application, the manner in which the Rx UE obtains the DRX parameters is not limited. As an example, the manner in which the Rx UE obtains the DRX parameters may include, but is not limited to, the following manners:

Method 1. Tx UE configures DRX parameters for Rx UE. For example, Tx UE actively configures DRX parameters for Rx UE. For another example, the Tx UE may also configure DRX parameters for the Rx UE based on the request of the Rx UE.

Manner 2. The network device configures DRX parameters for the Rx UE. For example, the network device proactively configures DRX parameters for the Rx UE. For another example, the network device may also configure DRX parameters for the Rx UE based on the request of the Rx UE.

Manner 3: DRX parameters are pre-configured in the Rx UE.

Manner 4: The DRX parameter of the Rx UE is predefined by a standard protocol, that is, the Rx UE is predefined to have the DRX parameter in the standard protocol.

Manner 5: There is a mapping relationship between the DRX parameter and the resource pool. If the Rx UE can sense resources or select resources from the resource pool, then the Rx UE has the DRX parameter.

Manner 6. There is a mapping relationship between the DRX parameter and the service type. For example, if the Rx UE needs to receive service data of the service type, then the Rx UE can use the DRX parameter.

Manner 7. The Rx UE configures the DRX parameters.

When the DRX mechanism is introduced for the Rx UE on the sidelink, the meaning of the relevant DRX timer configured for the Rx UE can follow the meaning of the Uu port:

Sidelink DRX duration timer (drx-onDurationTimerSL): when the DRX cycle starts, the duration of on duration. During on duration, the Rx UE is in an active state.

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

Sidelink DRX Inactivity Timer (drx-InactivityTimerSL): After the Rx UE successfully decodes the PSCCH on the Sidelink where the UE schedules the initial transmission of new data, the length of time it continues to be in the active state. That is, after the Rx UE is scheduled by the Tx UE, the Rx UE should turn on the drx-InactivityTimerSL corresponding to the Tx UE to extend the time that the Rx UE is in the active state. In other words, when the SidelinkDrx-inactivity timer starts running, the The active state of the Rx UE is extended or maintained, that is, the time the active state of the Rx UE is extended is the duration of the sidelinkDrx inactive timer. The corresponding scenario can be understood as the Rx UE is currently scheduled. It will continue to be scheduled in the next time period, so Rx UE needs to continue to remain active to wait to receive data;

sidelink DRX retransmission timer (drx-RetransmissionTimerSL): The maximum duration before the Rx UE receives the sidelink retransmission data from the Tx UE. While the drx-RetransmissionTimerSL is running, the Rx UE waits to receive the retransmission sent by the Tx UE on the sidelink. data. In other words, when the sidelinkDrx-retransmission timer starts to run, the active state of the Rx UE is extended or maintained.

sidelink DRX retransmission timer (drx-RetransmissionTimerSLL): The maximum duration before Rx UE receives the sidelink hybrid automatic repeat request (HARQ) corresponding to Tx UE and feeds back the retransmission side uplink resource, that is The length of time that the Tx UE needs to wait before receiving the acknowledgement (ACK) message/negative-acknowledgment (NACK) message sent by the Rx UE to feed back data. During the operation of the drx-RetransmissionTimerSLL, the Rx UE performs sidelink HARQ feedback.

Sidelink DRX long cycle start offset (drx-LongCycleStartOffsetSL): It means Long DRX Cycle and drx-StartOffsetSL. Among them, Long DRX Cycle specifies the number of subframes occupied by a long period/ms. drx-StartOffseSLt specifies the start subframe of the long and short DRX cycle;

Sidelink DRX short cycle (drx-ShortCycleSL) (optional): Short DRX cycle is the length of time of the short DRX cycle, in subframe/ms;

Sidelink DRX short cycle timer (drx-ShortCycleTimerSL (optional): the length of time the Rx UE is in the short DRX cycle, the unit is the number of Short DRX cycles;

drx-HARQ-RTT-TimerSL: The duration before Rx UE expects to receive Tx UE's sidelink HARQ retransmission data on the sidelink. The drx-HARQ-RTT-TimerSL can be understood as a time window during which the Tx UE will not retransmit the service data of the current transmission failure. It needs to wait for the drx-HARQ-RTT-TimerSL to expire, and the Rx UE In order to continue to receive the retransmitted data of the business data. When the drx-HARQ-RTT-TimerSL of the Rx UE times out, the Rx UE can start to receive the retransmission data for the service data from the Tx UE, and the drx-RetransmissionTimerDL is turned on.

drx-HARQ-RTT-TimerSLL: Rx The duration before the UE expects to receive sidelink HARQ retransmission resources on the sidelink, which can be understood as a time window. In this time window, the Rx UE cannot feedback the service data that the current transmission fails, and needs to wait for the drx-HARQ-RTT-TimerSLL to expire before the Rx UE feedbacks the service data sent by the Tx UE. That is to say, from the previous acknowledgement (ACK)/Negative acknowledgement (NACK) feedback transmission, after the length of the time window of this parameter, Rx UE starts to send ACK/NACK feedback, which is equivalent to this It is a restriction on ACK/NACK feedback to prevent Rx UE from sending feedback data all the time.

Therefore, when the Rx UE is configured with the DRX mechanism, the Rx UE is in the Drx active period (active time) mainly includes the following situations:

During operation of any timer of drx-onDurationTimerSL, drx-InactivityTimerSL, drx-RetransmissionTimerSL, drx-RetransmissionTimerSLL, or ra-ContentionResolutionTimer. Among them, ra-ContentionResolutionTimer is the timer used by the Rx UE in the random access process, which is used for the Rx UE to wait to obtain the access resources of the network device, but there may not be a random access process on the sidelink.

The Rx UE has sent a scheduling request (scheduling request, SR) on the physical uplink control channel (PUCCH), and the SR is currently in the pending state. Pending can be understood as the Rx UE has prepared but has not sent the network to the network. The device sends an SR.

Similar to ra-ContentionResolutionTimer, the Rx UE successfully received the RAR used to respond to the preamble of the contention-based random access selected by the non-Rx UE, but did not receive the PDCCH indicating the initial transmission using C-RNTI scrambling.

However, since the Rx UE is configured with the DRX mechanism, the Rx UE will not keep active. Therefore, the first information provided by the Rx UE to assist the Tx UE in resource selection is required by the time domain.

Hereinafter, a method for determining a side link resource provided by an embodiment of the present application will be described in detail with reference to FIG. 6 to FIG. 10.

It should be noted that the name of the message between each network element or the name of each parameter in the message in the following embodiments of the present application is just an example, and other names may also be used in specific implementations. The embodiments of this application do not make specific details about this limited.

It should be pointed out that the various embodiments of the present application can learn from each other or refer to each other, for example, the same or similar steps, the method embodiment, the communication system embodiment, and the device embodiment can all refer to each other without limitation.

The following describes in detail the technical solutions provided by the embodiments of the present application, taking the first terminal as the receiver terminal and the second terminal as the sender terminal as an example. It should be understood that, in the embodiment of the present application, the specific structure of the execution subject of the method for determining the side link resource is not particularly limited in the embodiment of the present application, as long as a determination of the embodiment of the present application can be recorded through the running record. The program of the code of the method for the side link resource can be communicated in a method for determining the side link resource according to the embodiment of the present application. For example, the execution subject of the method for determining side link resources provided by the embodiment of the present application may be a functional module in the receiving terminal that can call and execute the program, or a communication device applied to the receiving terminal, such as , Chips, chip systems, integrated circuits, and so on. These chips, chip systems, and integrated circuits may be installed inside the receiving terminal, or may be independent of the receiving terminal, which is not limited in the embodiment of the present application. The execution subject of the method for determining side link resources provided by the embodiments of the present application may be a functional module in the sender terminal that can call and execute the program, or a communication device applied to the sender terminal, such as a chip , Chip systems, integrated circuits, etc. These chips, chip systems, and integrated circuits may be installed inside the sender terminal, or may be independent of the sender terminal, which is not limited in the embodiment of the present application.

As shown in FIG. 6, FIG. 6 shows an interactive embodiment of a method for determining side link resources provided by an embodiment of the present application, and the method includes:

Step 601: The receiver terminal senses the side link resources.

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

With reference to FIG. 1, the receiver terminal may be the terminal 20 and the sender terminal may be the terminal 10.

It is understandable that in the embodiments of the present application, the receiver terminal and the sender terminal can perform 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 receiving mechanism to make the receiving terminal in a power saving mode, which is not limited in the embodiment of the present application. For the concept of the discontinuous reception mechanism, refer to the above description, which is not limited in the embodiment of the present application.

In the embodiment of the present application, the receiver terminal may receive retransmitted data or newly transmitted data from the second terminal when it is in the activated state.

In the embodiment of the present application, although the receiver terminal cannot receive service data in the dormant state, it can send data or signaling, such as sending first information.

The receiving terminal in the embodiment of the present application can perceive side link resources in the receiving resource pool. The so-called receiving resource pool refers to a resource pool in which the receiving terminal can receive service data (for example, retransmitted data or newly transmitted data). The resource pool is for the sender terminal, and the sender terminal can select resources in the receiving resource pool to send service data. In other words, the resource pool is a receiving resource pool for the receiver terminal, and a sending resource pool for the sender terminal.

Newly transmitted data is the first (first time) data transmitted by the sender terminal or another terminal to the receiver terminal. The retransmitted data is the data that the sender terminal or other terminal transmits to the receiver terminal for the Mth time. In other words, the retransmitted data is the data that the sender terminal or other terminal transmits to the receiver terminal for the first time. M is an integer greater than or equal to 2, and M is less than or equal to the maximum number of retransmissions for the sender terminal to transmit the data.

Step 602: The receiver terminal determines the information of the candidate side link resource in the first time period, and the receiver terminal is in the active state in the first time period.

It can be understood that the candidate side link resources are all or part of the side link resources among all the side link resources perceived by the receiver terminal. The number of candidate side link resources in the embodiment of the present application is one or more.

Step 603: The receiver terminal sends the first information (for example, auxiliary information) to the sender terminal, and correspondingly, the sender terminal receives the first information from the receiver terminal. The first information is used to indicate side link resource information. The side link resources are all or part of the side link resources in the above candidate side links.

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

Exemplarily, the first information includes side link resource information. For example, the side link resource may be a time-frequency resource. Then, the side link resource information may include subchannel (subchannel) number, subframe (subframe) number, or time slot (slot), etc.

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

As a possible implementation, step 603 in the embodiment of the present application can be implemented in the following manner: the receiver terminal sends the first message including the first information to the sender terminal, and correspondingly, the sender terminal receives the message from the receiver terminal. The first news.

For example, the first message may be an RRC message, a MAC layer control element (MAC control element, MAC CE), sidelink control information (sidelink control information, SCI), and so on. For example, the first message includes a first field and a second field. The first field is used to indicate the time domain information of the side link resource, and the second field is used to indicate the frequency domain information of the side link resource. The domain information may include a subframe number and/or slot, and the frequency domain information may include a subchannel number. In other words, the first information is a first field and a second field. For another example, the first message includes a field that can directly indicate the side link resource.

In the above-mentioned solution in the embodiment of the present application, the side link resource provided by the receiver terminal to the sender terminal is located in the first time period. Since the receiver terminal is in the active state during the first time period, the receiving terminal The side link resource provided by the side terminal to the sender terminal by using the first information is located in the time period corresponding to the active state of the receiver terminal, so as to prevent the receiver terminal from using the second A piece of information provides the sender terminal with information about the side link resources that do not belong to the active time range corresponding to the active state of the receiver terminal. In addition, the side link resource is provided by the receiver terminal to the sender terminal. When the receiver terminal provides the side link resource, it can fully consider the quality of the data received on the side link resource, so that the subsequent access to the side link resource Receiving data from the sender terminal on the uplink resource can improve its own communication quality. Furthermore, in this solution, since the receiver terminal has both a dormant state and an active state, it can achieve the effect of saving power for the receiver terminal.

As a possible embodiment, the method provided in the embodiment of the present application may further include after step 603: the sender terminal selects the target side link resource from the side link resources according to the first information. The sender terminal sends service data to the receiver terminal on the target side uplink, and correspondingly, the receiver terminal receives the service data from the sender terminal.

The selection of the target side link resource from the side link resources by the sender terminal according to the first information may be implemented in the following manner: the sender terminal determines the side link resource indicated by the first information according to the first information. Then the sender terminal selects the target side link resource according to the priority of the side link resource or signal quality or CBR or time domain location. Taking side link resources including side link resource 1 and side link resource 2 as an example, if the priority of side link resource 1 is higher than the priority of side link resource 2, or if the side link resource The signal quality of channel resource 1 is higher than the signal quality of side link resource 2, or if the time domain position of side link resource 1 is before the time domain position of side link resource 2, then the sender terminal will The link resource 1 is used as the target side link resource, and the side link resource 1 is subsequently used to send service data to the sender terminal. 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 side link resource 1 is less than the time interval between the time domain position of side link resource 2 and the time domain, then send By selecting the side link resource 1 to send the service data, the side terminal can ensure that the service data is sent to the receiving side terminal as soon as possible.

As a possible embodiment, as shown in FIG. 7, when the receiving terminal includes the MAC layer and the PHY, step 601 in the embodiment of the present application may be implemented through step 701, and step 602 may be implemented through step 702.

Step 701: The MAC layer sends a perception indication and information for indicating the first time period to the PHY. Correspondingly, the PHY receives the perception indication and information for indicating the first time period from the MAC layer.

Among them, the perception indication is used to notify the PHY to perceive side link resources.

In the embodiment of the present application, the sensing indication is used to notify the PHY to immediately sense the side link resource after receiving the sensing indication or the sensing indication is used to notify the PHY to start sensing the side link at a specified time after receiving the sensing indication. Road resources, this embodiment of the application does not limit this.

In a possible embodiment, the perception indication in step 701 of the embodiment of the present application can be omitted, that is, if the MAC layer sends information indicating the first time period to the PHY, the information indicating the first time period is passed The PHY is implicitly instructed to sense the side link resources, so that after the PHY receives the information for indicating the first time period, it can determine the sense side link resources.

As an example, the inter-layer interaction between the MAC layer of the receiver terminal and the PHY can be implemented in the following manner: for example, the MAC layer of the receiver terminal sends a notification to the PHY, and correspondingly, the PHY receives the notification sent by the MAC layer. The notification includes a perception indication and information for indicating the first time period.

For example, the information used to indicate the first time period may be the start time of the first time period (also known as the start time or start time), and the end time of the first time period (also known as the end time). Time, or end time). The start time of the first time period may be an absolute time or a time interval from the current time. For example, the first time period is the first symbol in time slot 1 to the last symbol in time slot 1, then the information used to indicate the first time period can be the first symbol in time slot 1, and time The last symbol in slot 1. For another example, the information used to indicate the first time period may be the start time of the first time period and the duration of the first time period. For example, the information used to indicate the first time period may be the first symbol in slot 1 and the length is 14 symbols. Here, a slot including 14 symbols is taken as an example.

For example, the start time of the first time period can be reflected by the current time and time interval. For example, the current time is t0, then the MAC entity sends the time interval Δt to the physical layer, and the physical layer can determine t0+Δt as the first time interval. The start time of a time period. The physical layer can use the time when the notification is received as the current time. As another example, the first time period may be implemented by the offset value of the subframe number in the system frame.

As a possible embodiment, before step 701, the method in the embodiment of the present application may further include: the MAC layer of the receiving terminal considers the service type of the service data and the resource reservation time limit corresponding to the service type, and then notifies the physical The layer starts to sense the side link resources.

For example, the service type may be whether the service data is a periodic service or a non-periodic service, the arrival characteristics of the service data, the delay, and so on.

For example, the MAC layer of the Rx UE is based on the service data communicated between the Rx UE and the Tx UE, and knows that the service type of the service data is an aperiodic service. It can further be seen that the aperiodic resource reservation aging time is based on the MAC layer of the Rx UE. The first time period and the aperiodic resource reservation time limit is calculated at the first moment when the PHY starts to perceive the resource. For example, the first time period is the absolute time 100ms-125ms, and the aperiodic resource reservation time limit is 32ms, in order to ensure that the Rx UE reserves The time domain location corresponding to the resource is within the first time period, and the first time may be 100 ms minus 32 ms, that is, 68 ms, or the time period after 68 ms to 100 ms before.

Step 702: The PHY determines the candidate side link resource information in the first time period from the sensed side link resources, and the PHY reports the candidate side link resource information to the MAC layer. Accordingly, the MAC The layer obtains the information of candidate side link resources located in the first time period from the physical layer.

In the embodiment of the present application, the PHY senses the side link resource immediately or at a specified time after receiving the sensing instruction from the MAC layer. If the PHY perceives the side link resources located in the first time period from the receiving resource pool, the PHY reports to the MAC layer the information of the side link resources that are sensed in the first time period, that is, the candidate side line Link resource information.

It is understandable that the PHY starts to sense the side link resources immediately after receiving the sensing instruction or starts to sense the side link resources after a specified time, and then the PHY will sense all the side link resources after receiving the sensing instruction The side link resources located in the first time period are reported to the MAC layer as candidate side link resources. In other words, the candidate side link resources located in the first time period can be regarded as the side link resources perceived by the PHY that can be used to send service data from the receiving terminal to the receiving terminal.

The candidate side link resource in the embodiment of the present application means that the time domain position of the candidate side link resource is within the first time period.

It is understandable that, when the PHY in the embodiment of the present application receives the sensing indication, it not only senses the side link resources in the first time period, but also senses that it is located at the first time from the first moment or a specified time point. Side link resources outside the segment.

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

The foregoing candidate side link resources may be all or part of the side link resources of the M candidate side link resources sensed by the PHY from the first moment or a specified time point to the end of the period. Link resources are not limited in this embodiment of the application.

Similarly, when the PHY reports candidate side link resource information to the MAC layer, the inter-layer interaction between the PHY and the MAC layer can be understood to depend on the implementation of the receiving terminal, which is not done in the embodiment of this application. limited.

When the number of candidate side link resources is multiple, the PHY reporting the candidate side link resource information to the MAC layer can be implemented in any of the following ways:

Manner a: The PHY reports the candidate side link resources in the first time period to the MAC layer one by one.

For example, when the PHY senses the candidate side link resource a, it sends the sensing result 1 to the MAC layer, and the sensing result 1 includes the information of the candidate side link resource a. Then, the PHY perceives the candidate side link resource b and sends the perception result 2 to the MAC layer. The perception result 2 includes the information of the candidate side link resource b, and so on, until the PHY has reported all the candidate sides to the MAC layer Information about uplink resources.

Method b. The PHY first reports the information of part of the candidate side link resources to the MAC layer, and then successively reports the information of the remaining part of the candidate side link resources to the MAC layer.

For example, in method b, if the PHY perceives candidate side link resource 1 to candidate side link resource 4, then the PHY sends sensing result 1 to the MAC layer, and the sensing result 1 includes candidate side link resource 1 ~ Candidate side uplink resource 2 information. Subsequently, the PHY may report the information of the candidate side link resource 3 and the information of the candidate side link resource 4 to the MAC layer one by one.

Manner c. PHY The information of all candidate side link resources among the multiple candidate side link resources is reported to the MAC layer in a unified manner, which is not limited in the embodiment of the present application.

For example, in method c, the PHY sends the sensing result to the MAC layer, and the sensing result includes information about all candidate side link resources. In way c, the information of all candidate side link resources may be carried in the same sensing result, or may be carried in different sensing results.

Step 703 is the same as step 603 and will not be repeated here.

In the case that the receiving terminal adopts the discontinuous reception DRX mechanism, the DRX cycle includes the activation period (on duration) and the dormancy period (opportunity for drx). Under different circumstances, the receiving terminal turns on the timer in different DRX parameters. This leads to differences in the specific behaviors of the receiver's terminal. The following will separately introduce how the receiver should perceive to provide the first information.

Case 1-1: The first time period is within the activation period of the receiver terminal.

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

In case 1-1, as a possible implementation manner, step 701 in the embodiment of the present application can be implemented in the following manner: the MAC layer sends a perception indication and information for indicating the first time period to the PHY at the first moment , The first time is in the sleep period, and the first time is before the first time period.

For example, as shown in FIG. 8, FIG. 8 takes the DRX cycle 1 and the DRX cycle 2 of the receiver terminal, the DRX cycle 1 is located before the DRX cycle 2, and the DRX cycle 1 and the DRX cycle 2 are adjacent to each other as an example. Among them, before the on duration in DRX cycle 2 (ie T1 in Figure 8) starts, the MAC layer of the receiver terminal considers the service type and the resource reservation time limit corresponding to the service type. At time n1 (that is, the first time mentioned above), the PHY is notified to start sensing and the corresponding target receiving resource range is on duration. Among them, the time period from time n1 to the start time of on duration in DRX cycle 2 is the time corresponding to the resource reservation aging. If the MAC layer sends a perception indication to the PHY earlier than time n1, it may cause the PHY to select the location The resource before on duration in DRX cycle 2, that is, the resource that the receiver terminal is in the dormant period of DRX cycle 1 is selected. Therefore, the MAC layer sends a perception indication to the PHY at time n1 to ensure that the resources selected by the PHY are within the on duration of the DRX cycle 2, thereby saving energy consumption. The so-called target receiving resource refers to the side link resource that the receiver terminal can receive service data from the second terminal.

The so-called target receiving resource range is the time domain location of the side link resource that can be used to receive the service data sent by the sender terminal.

As shown in FIG. 8, time n1 is located in the dormant period adjacent to the active period corresponding to the first time period. Time n1 is before time n2. In other words, the time n1 is located in the dormant period (that is, the dormant period in DRX cycle 1) adjacent to the on duration (that is, the active period in DRX cycle 2) corresponding to the first time period. The time n2 can be understood as: the time when the dormant period in DRX cycle 1 ends or the time when the active period in DRX cycle 2 starts. The time n2 may be any time between the time 1 in the DRX cycle 1 and the time when the sleep period in the DRX cycle 1 ends. In FIG. 8, time n2 is taken as the time when the sleep period in DRX cycle 1 ends as an example.

For example, as shown in FIG. 8, the first time period is on duration in DRX cycle 2, that is, T1 in FIG. 8, during which the receiver terminal is in the active state. The time n1 in FIG. 8 is the first time mentioned above. The first time period is within the activation period, and it may be the same as the activation period or less than the duration of the activation period. For example, the duration of the first time period is the drx-onDurationTimer that runs during the activation period in DRX cycle 2. Duration.

For example, when the service data sent by the sender terminal is a periodic service, the side link resources provided by the receiver terminal to the sender terminal by using the first information should be within the time corresponding to the periodical service resource reservation. Sidelink resource, that is t in Figure 8; when the service data sent by the sender terminal is an aperiodic service, the sidelink resource provided by the receiver terminal to the sender terminal using the first information should be the resource of the aperiodic service Reserve sidelink resources within the time corresponding to the aging time, that is, t in Figure 8.

As a possible implementation, in this embodiment of the application, the receiver terminal can determine whether the service data is a periodic service or a non-periodic service through the indication of the service identifier in the high-level (such as MAC layer or RRC layer) signaling, or The previously monitored indication of the reserved resources carried in the SCI sent by the sender terminal is not limited in the embodiment of the present application. By judging whether the service data is a periodic service or a non-periodic service, it is convenient for the receiver terminal to perceive the side link resources and provide effective auxiliary information.

In case 1-1, in order to ensure the timeliness of the subsequent receiving terminal to send the first information, the PHY can report candidate side link resource information to the MAC layer in the following manner:

In a possible embodiment, the side link resource in the embodiment of this application may correspond to an effective time period (determined by the effective start time and the effective end time), and the effective time period corresponding to the side link resource represents The side link resource is available in the effective time period, that is, the side link resource can be used as a resource for the receiver terminal to receive service data in the effective time period, and the side link resource can be considered effective at this time. In other words, for a side link resource that is not within the effective period of time, the side link resource can be considered to be invalid. The failure of the side link resource means that the side link resource cannot be used as a resource for the receiver terminal to receive service data. For example, the effective time of the side link resource a is from time a to time L, then the side link resource a can be considered valid before the time L, and the side link resource a is invalid if the time L is exceeded. . It is uniformly explained here that all subsequent descriptions that involve the failure of candidate side link resources or the failure of side link resources can be referred to the number of times, and will not be repeated in the following.

Manner 1-1, the PHY reports the information of the candidate side link resource before T1 (for example, the PHY is at least time n2 or before time n2 in Figure 8), and/or before the candidate side link resource fails To the MAC layer. It is understandable that time n1 is before time n2.

For example, the candidate side link resource includes candidate side link resource 1 and candidate side link resource 2. The effective cut-off time of candidate side link resource 1 is Tm, and the effective cut-off time of candidate side link resource 2 If Tn is Tn, Tm and Tn are located before the start of T1, and Tm is earlier than Tn, then the PHY reports the information of candidate side link resource 1 and candidate side link resource 2 to the MAC layer before Tm. The effective expiration time of each candidate side link resource can be pre-configured, or it can be an inherent attribute of the resource pool configured by the network device, or the effective expiration time can be defined by the receiving terminal itself, which is not done in the embodiment of this application. limited.

In case 1-1, as a possible implementation, the receiving terminal in step 703 in the embodiment of the present application sending the first information to the sending terminal can be implemented in the following manner: the receiving terminal at the second moment ( For example, at time n2 in FIG. 8, the first information is sent to the second terminal, the second time is before the first time period, and the second time is in the dormant period. In this way, the timeliness of the side link resources provided by the receiver terminal to the sender terminal can be guaranteed.

In case 1-1, as another possible implementation manner, in step 703 in this embodiment of the present application, the receiving terminal sends the first information to the sending terminal can be implemented in the following manner: the receiving terminal is at the first time Before the start of the segment and before the side link resource fails, the first information is sent to the second terminal. For how to determine the failure of the side link resource, reference may be made to the above description, which will not be repeated here.

Based on Case 1-1, if the receiving terminal perceives the side link resources after the on duration (ie T1 in FIG. 9) ends, the receiving terminal reserves the side link resources after the on duration ends. In addition, the receiving terminal determines whether the PSCCH scheduling signal is received within on duration and whether the PSCCH is successfully demodulated. Based on whether the receiving terminal successfully demodulates the PSCCH, there is a difference in the way the receiving terminal determines the first time period. The following will describe the specific content of the first time period in combination with Case 1-2-1 and Case 1-2-2. :

Case 1-2-1, the first timer is the side link DRX inactivity timer (drx-InactivityTimerSL), the first time period is the timing duration of the first timer of the receiver terminal, and the first timer is used to maintain The activation status of the receiving terminal. That is, the first time period is the timing duration of the side link DRX inactivation timer. The so-called timing duration of the first timer refers to the duration of the first timer running from the start to the end.

With reference to Figure 9, T1 is the duration of the active period of the DRX cycle 2 of the terminal. The timing duration of the first timer is T2 time period. The receiving terminal is in the active state during the T1 time period and the T2 time period. Since T1 and T2 overlap, it can be considered that after the end of T1 and before the end of T2, the active state of the receiving terminal is changed. Extend the time until the end of T2. In FIG. 9, the dormant state of the receiving terminal in DRX cycle 2 is the time after the end of T2, that is, S1 in the figure.

In FIG. 9, the receiver terminal is in the 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 can be implemented in the following manner: the MAC layer sends a perception indication to the PHY at the first moment (for example, moment n4 in FIG. 9) and is used for The information indicating the first time period, and the receiving terminal is in the active state at the first moment.

To introduce the situation 1-2-1 in detail, as shown in Figure 9: The MAC layer of the receiver terminal informs the PHY of sensing resources at time n3 in DRX cycle 1, and provides the PHY with time period information in DRX cycle 2 ( For example, T1) to instruct the PHY to report candidate side link resources located in T1. The PHY perceives side link resources based on the perception instructions of the MAC layer. If the PHY of the receiving terminal perceives the side link resources located after the on duration (that is, T1 in Figure 9) (for example, the side link in Figure 9) Channel resource 1), the PHY of the receiver terminal reserves the information of the side uplink resource 1 and determines whether the control channel scheduling signal is received and the demodulation is successful.

Case a. If the receiving terminal does not receive the PSCCH scheduling signal during the on duration (ie T1 in Figure 9), even if the PHY of the receiving terminal perceives the side link resource after the end of the active period T1, it will receive The side terminal may not transmit the auxiliary information indicating the information of the side link resource 1. This is because the side link resource 1 is not within the active time range, that is, the step of sending auxiliary information from the receiver terminal to the sender terminal can be omitted.

Case b. If the receiver terminal receives the PSCCH during the on duration (ie T1 in Figure 9) and demodulates it successfully, then as shown in Figure 9, the receiver terminal turns on the first at time n4 (corresponding to the first time) Timer (for example, drx-InactivityTimerSL, the running time of the drx-InactivityTimerSL is T2), the receiver terminal will continue to monitor the service data (that is, newly transmitted data) sent by the sender terminal during the operation of drx-InactivityTimerSL, That is, the active state of the receiving terminal is maintained. In addition, starting the first timer by the receiver terminal means that the range of the side link resources provided by the receiver terminal to the sender terminal is expanded. That is, time n4 is the start time of the operation of drx-InactivityTimerSL, and from time n4 to the end time of the operation of the drx-InactivityTimerSL, the receiver terminal maintains the active state.

When the receiver terminal receives the PSCCH and demodulates it successfully (at time n4 in Figure 9, the time n4 is within T1, and the receiver terminal is in the active state within T1), then, as another possible implementation , Step 701 in the embodiment of the present application can be implemented in the following manner: the MAC layer of the receiving terminal sends a perception indication to the PHY at time n4 (corresponding to the first time), and the first time period notified to the PHY is the drx-InactivityTimer The running time is T2 in Figure 9. The PHY of the receiver terminal performs sensing based on the perception instructions of the MAC layer. If the PHY of the receiver terminal senses the side link resources in T2, it will report the candidate side link resources within the T2 time range to the PHY to the MAC layer. Information. Optionally, in the embodiment shown in FIG. 9, at n4, the MAC layer sends a perception notification to the PHY, and the perception notification is used to indicate that the perception time is extended. Or at time n4, the MAC layer sends a perception notification to the PHY, where the perception notification is used to instruct the PHY to perform sidelink resource awareness and to indicate information for the first time period.

It can be understood from Figure 9 that the MAC layer has notified the PHY to sense at time n3, and the PHY also performs the sensing process. Due to the operation of drx-InactivityTimer, the MAC layer will notify the PHY again to sense at time n4, and the PHY will continue to sense, and Report the side link resource information within the duration of drx-InactivityTimer.

As a possible embodiment, in case 1-2-1, before step 701, the method provided in this embodiment of the present application may further include: during the operation of any timer corresponding to the active state of the receiving terminal, The receiver terminal starts the first timer at the first time (for example, time n4 in FIG. 9), and the first time is the time when the receiver terminal successfully demodulates the PSCCH scheduling signal in the active state.

In case 1-2-1, the MAC layer notifies the PHY of the receiver terminal to start sensing resources, and notifies the PHY that the range of the target receiving resource corresponding to the current sensing is the duration of the currently running drx-InactivityTimer. The specific implementation can refer to the situation The way the MAC layer notifies the PHY in 1-1 will not be repeated here.

In order to ensure the timeliness of the first information and prevent the failure of the side-link resource when the sender terminal receives the information of the side-link resource, as a possible embodiment, as shown in FIG. 9, in this case In 1-2-1, in step 702 of the embodiment of the present application, the process in which the PHY reports the information of the candidate side link resource to the MAC layer can be implemented in the following manner: the PHY is before the first timer expires and the candidate Before the side link resource fails, the information of the candidate side link resource is sent to the MAC layer.

For example, the PHY reports the candidate side link resource information as the sensing result to the MAC layer before the drx-InactivityTimerSL expires and before the candidate side link resource fails. For example, if the running time period of drx-InactivityTimerSL is [5ms, 20ms], the perception result includes time-frequency resources with time domain time of 7ms, 9ms, 15ms, and 18ms as one or more candidate side link resources, which is reasonable The situation may be: the PHY reports the information of all candidate side link resources among the one or more candidate side link resources to the MAC layer at least in the 6th ms, or the PHY reports the time domain time to the MAC layer in the 6 ms The time-frequency resource of the 7th ms, the time-frequency resource of the 9th ms is reported in the 8th ms, and so on.

Unreasonable situations such as: PHY reports information about all side link resources in one or more candidate side link resources to the MAC layer in the 20th ms, or PHY reports the time domain time to the MAC layer in the 7th ms in the 7th ms The time-frequency resources of the 9th ms are reported, and the time-frequency resources of the 9th ms are reported in the 9th ms.

Regarding the manner in which the PHY reports candidate side link resources to the MAC layer, reference may be made to the relevant description in the above case 1-1, which is not repeated in the embodiment of the present application.

In order to ensure the timeliness of the first information, as a possible embodiment, in this case 1-2-1, the process of sending the first information from the receiver terminal to the sender terminal in this embodiment of the application can be performed in the following manner Implementation: The receiver terminal sends the first information to the sender terminal before the drx-InactivityTimerSL times out and/or before the side link resource fails.

With reference to FIG. 9, the receiver terminal may send the first information to the sender terminal before time n5 (corresponding to the second time) and before the sidelink resource fails. For a specific example, please refer to the example in which the PHY reports candidate side link resources to the MAC layer, which will not be repeated here.

It should be noted that, in the above case 1-2-1, the receiver terminal determines whether the PSCCH is received during the on-duration (ie T1 in Figure 9) operation period as an example, but the above situation still applies: the receiver terminal is in During the operation of the timer corresponding to the active state, the receiver terminal will behave after receiving the PSCCH and successfully demodulating and turning on drx-InactivityTimerSL. This embodiment of the application does not limit this, in other words, any timer corresponding to the above-mentioned active state It can be any of the following: drx-onDurationTimerSL or drx-InactivityTimerSL or drx-RetransmissionTimerSL or drx-RetransmissionTimerSLL or ra-ContentionResolutionTimer.

Case 1-2-2. The first time period is the duration of the first timer of the receiving terminal, and the first timer is the active state of the receiving terminal confirming to receive the retransmission transmitted by the sending terminal on the side link Started in case of data. For example, the first timer is drx-RetransmissionTimerSL. In FIG. 10, in the T1 time period, T2 time period, and T3 time period, the receiver terminal is in an active state. The duration of drx-RetransmissionTimerSL (may also be referred to as: running time) is the time period during which the receiver terminal continues to maintain the active state.

If the receiver terminal receives the PSCCH in the active state but the demodulation is not successful, the receiver terminal determines to receive the retransmitted data transmitted by the sender terminal on the side link in the active state.

As a possible embodiment, in case 1-2-2, the method provided in the embodiment of the present application may further include: during the operation of any timer corresponding to the receiver terminal being in the active state, if the receiver terminal In the case that the PSCCH scheduling signal is not successfully demodulated, the receiving terminal starts the second timer and the third timer. When the second timer expires, the receiver terminal may also start the first timer. The receiver terminal can monitor the retransmitted data during the running of the first timer. Wherein, the receiving terminal maintains the active state of the receiving terminal during the operation of the third timer, and the second timer indicates 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 situation 1-2-2 in detail, it will be further explained with reference to Figure 10. As shown in Figure 10, at the time n1 when the receiving terminal is in the dormant state, the MAC layer of the receiving terminal sends a perception instruction to the PHY of the receiving terminal. And T1. If the PHY of the receiving terminal perceives the side link resources after the on duration (ie T1 in Figure 10) ends, the PHY of the receiving terminal reserves the side link resources sensed after T1 and determines whether the received PSCCH scheduling signal and whether demodulation is successful.

Case c is the same as case a, and will not be repeated here.

Case d. If the receiver terminal receives the PSCCH scheduling signal during the on duration (ie T1 in Figure 10) but fails to demodulate it successfully, the receiver terminal simultaneously turns on drx-InactivityTimerSL and drx- at time n6 in Figure 10 HARQ-RTT-TimerSL. Among them, for the description of drx-InactivityTimerSL, please refer to the description in Case 1-2-1, which will not be repeated here.

When the drx-HARQ-RTT-TimerSL times out, the receiver terminal turns on drx-RetransmissionTimerSL, that is, the receiver terminal will monitor the retransmission data sent by the sender terminal during the operation of drx-RetransmissionTimerSL, which also means that the receiver terminal is extended to send The range of side link resource information provided by the terminal.

Therefore, in case 1-2-1, step 701 in the embodiment of the present application can be implemented in the following manner: at the same time that the receiving terminal turns on drx-RetransmissionTimerSL (that is, time n7 in FIG. 10 corresponds to the first time mentioned above) , The MAC layer sends the perception indication and the T3 time period to the PHY. Among them, the T3 time period is the duration of the drx-RetransmissionTimerSL run by the receiver terminal.

The PHY starts sensing according to the sensing instructions. If the PHY perceives the candidate side link resource within the range of drx-RetransmissionTimerSL, it reports the perceptual result to the MAC layer. The sensing result includes candidate side link resources in the T3 time period.

It can be understood in conjunction with Figure 10 that at time n1, the MAC layer has notified the PHY to sense, and the PHY also performs the sensing process. Due to the operation of drx-RetransmissionTimerSL, then at time n7, the MAC layer notifies the PHY to extend the sensing time and need to continue sensing, PHY Will continue to perceive. After that, if the PHY perceives the side link resource within the duration of drx-RetransmissionTimerSL, it will report the side link resource information within the duration of drx-RetransmissionTimerSL to the MAC layer. Optionally, in the embodiment shown in FIG. 10, at time n7, the MAC layer sends a perception notification to the notification PHY, and the perception notification is used to indicate that the perception time is extended. Or at time n7, the MAC layer sends a perception notification to the notification PHY, where the perception notification is used to instruct the PHY to perform sidelink resource awareness and to indicate the information of the first time period. The perception notification may only contain the information of the first time period, but not the perception indication. After the PHY receives the information of the first time period, the default perception time is extended.

10, the timing duration of the first timer is T3, the active state of the receiver terminal includes not only the T1 time period and the T2 time period, but also the T3 time period; the dormant state of the receiver terminal includes the DRX cycle 2 except Time periods other than T1, T2, and T3.

It should be noted that, in order to ensure the timeliness of the first information sent by the receiver terminal to the sender terminal, in case 1-2-1, the PHY can report candidate side link resource information to the MAC layer in the following manner : The PHY reports the candidate side link resource information to the MAC layer before the drx-RetransmissionTimerSL expires, and/or before the PHY detects the failure of the candidate side link resource in T3.

In this case 1-2-2, the manner in which the PHY reports the perceived information of the candidate side link resource to the MAC layer can refer to the description in the foregoing embodiment, which will not be repeated here.

In this case 1-2-2, the receiver terminal in step 703 of the embodiment of the present application sends the first information to the sender terminal in the following manner: the receiver terminal is before the drx-RetransmissionTimerSL timeout and the side link Before the resource becomes invalid, the first information is sent to the sender terminal. For specific examples, refer to the information reported by the PHY to the candidate side link resources of the MAC layer.

As shown in FIG. 10, before time n8 and before the side link resource fails, the receiver terminal sends the first information to the sender terminal.

It should be noted that although in the above description of this situation, the description involved is that the receiver terminal determines whether the PSCCH is received during the on-duration operation, but the above situation still applies to the corresponding situation where the receiver terminal is in the active state. During the timer operation, the receiver terminal starts the drx-HARQ-RTT-TimerSL after receiving the PSCCH and the demodulation is unsuccessful. When the drx-HARQ-RTT-TimerSL times out, the receiver terminal will enable the subsequent behavior of drx-RetransmissionTimerSL.

As a possible embodiment, before step 603, the method provided in the embodiment of the present application may further include: the receiver terminal screens and sorts the perceived candidate side link resources to select the candidate side link resources Determine some candidate side link resources as side link resources.

For example, if the number of candidate side link resources is multiple, before the receiver terminal sends the first information, the multiple candidate side link resources may also be sorted and screened. For example, when the resources available for the receiving terminal to send the first information are limited, the receiving terminal may filter out candidate side link resources with a quality greater than or equal to the quality threshold from multiple candidate side link resources as the side link resources. resource. Or, when the number of the first information sent by the receiver terminal is limited, the receiver terminal may sort the quality of multiple candidate side link resources from highest to lowest, and then select the highest quality according to the number of first information sent. The previous candidate side link resources are used as side link resources. Among them, for example, the receiver terminal may use the candidate side link resource whose CBR value is lower than the threshold value among the candidate side link resources as the side link resource. Alternatively, the receiving terminal sorts the CBR value of each candidate side link resource among the candidate side link resources. When the number of resources for the receiving terminal to send the first information is limited, the receiving terminal can sort the CBR values of multiple candidate side link resources from low to high, and then select the candidate side chain with the low CBR value Road resources are side link resources.

For example, there are two resources for sending the first information, and the multiple candidate side link resources include candidate side link resource 1 to candidate side link resource 3, and the CBR value of candidate side link resource 1 At the lowest, the CBR value of the candidate side link resource 2 is greater than the CBR value of the candidate side link resource 1, but is smaller than the CBR value of the candidate side link resource 3. Then the receiving terminal can select candidate side link resource 1 to candidate side link resource 2 as the side link resources.

With reference to the descriptions of the above case 1-2-1 and case 1-2-2, the first time period is the timing duration of the first timer of the receiver terminal, and the first timer is used to maintain the active state of the receiver terminal.

The foregoing embodiment mainly describes the process of how to sense side link resources. The following will exemplify descriptions in combination with Case 3-1 to Case 3-3. How does the receiving terminal determine that it can stop sensing for the receiving resource pool, In order to avoid that the time domain position of the side link resource indicated by the first information is in the dormant period.

In a possible embodiment, in the embodiment of this application, if the receiver terminal receives the MAC CE within the active state or the timer corresponding to the active state is running, or does not receive the PSCCH scheduling signal before the timer expires, then it receives The side terminal stops sensing the side link resources.

The following will describe the process in which the receiver terminal stops sensing side link resources in conjunction with case 3-1 to case 3-3, respectively.

Case 3-1. Combining the above case 1-2-1, as shown in Figure 11, during the operation of the drx-InactivityTimerSL of the receiver terminal (T2), the receiver terminal receives the sidelinkdrx command MAC CE, or before the drx-InactivityTimerSL times out. If the PSCCH scheduling signal for scheduled transmission is not received, the receiver terminal will enter the dormant period for DRX cycle 2.

Specifically, the receiving terminal enters the dormant period for DRX cycle 2 when receiving the sidelinkdrx command MAC CE. Alternatively, after the drx-InactivityTimerSL expires, the receiver terminal enters the dormant period for DRX cycle 2 and maintains the dormant state in DRX cycle 2.

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

Step 11. When the receiving terminal is in the active period of DRX cycle 2 as shown in FIG. 11, if the receiving terminal receives the PSCCH scheduling signal and demodulates it successfully, the receiving terminal starts the first timing at time n4 (For example, drx-InactivityTimerSL), the receiver terminal will monitor the service data sent by the sender terminal during the operation of drx-InactivityTimerSL, which also means that the receiver terminal's sensing range of side link resources is expanded.

Step 12. During the operation of drx-InactivityTimerSL, the receiver terminal does not receive the PSCCH scheduling signal to continue scheduling transmission, and the drx-InactivityTimerSL at the receiver terminal times out, and the receiver terminal enters the dormant period for DRX cycle 2, then the receiver terminal When the drx-InactivityTimerSL times out, the receiver terminal should stop sensing the side link resources.

Specifically, the MAC layer of the receiver terminal notifies the PHY to stop sensing for auxiliary information, or the PHY determines that the service data of the sender terminal corresponding to the drx-InactivityTimerSL is not received during the operation of the drx-InactivityTimerSL, then the drx-InactivityTimerSL After the timeout, the PHY automatically stops sensing for the side link resource indicated by the first information, and at the same time, by default, the MAC layer stops sensing for the side link resource indicated by the first information has stopped.

Step 13. During the operation of drx-InactivityTimerSL, the receiving terminal receives the sidelinkdrx command MAC CE, and the receiving terminal will enter the dormant period for DRX cycle 2. When receiving the sidelinkdrx command MAC CE, the receiving terminal should stop sensing Side link resources. Among them, sidelinkdrx command MAC CE is a MAC layer command that can make the receiver terminal enter the dormant state.

The difference between step 12 and step 13 is: in step 12, the receiver terminal expires in drx-InactivityTimerSL, the receiver terminal will enter the dormant period for DRX cycle 2, and in step 13, the receiver terminal runs during drx-InactivityTimerSL When receiving the sidelinkdrx command MAC CE, it enters the dormant period for DRX cycle 2. In other words, the time when the receiver terminal enters the dormant period for DRX cycle 2 in step 13 is earlier than or equal to the time when the receiver terminal enters dormancy for DRX cycle 2 in step 12 Period of time. If the receiving terminal receives the sidelinkdrx command MAC CE in step 13, then the receiving terminal directly enters the dormant state without the relevant steps of step 12.

As a specific implementation: the MAC layer of the receiver terminal notifies the PHY layer to stop sensing for auxiliary information, or the PHY determines that the sidelinkdrx command MAC CE is received during the drx-InactivityTimerSL operation period, then the PHY automatically stops indicating to the first information At the same time, the MAC stops by default the sensing of the side link resource indicated by the first information has stopped.

Case 3-2, combined with the above case 1-2-2, during the operation of the receiver terminal's drx-RetransmissionTimerSL, the receiver terminal receives the sidelinkdrx command MAC CE, or the drx-RetransmissionTimerSL does not receive the PSCCH scheduling signal for scheduled transmission before the timeout , The receiver terminal will enter the dormant period for the current DRX cycle.

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

Step 31. Assuming that the receiver terminal is currently in the active period of DRX cycle 2, and the receiver terminal receives the PSCCH scheduling signal but fails to demodulate it successfully, the receiver terminal simultaneously turns on drx-InactivityTimerSL and drx-HARQ-RTT-TimerSL, that is The receiver terminal will monitor the service data sent by the sender terminal during the operation of the drx-InactivityTimerSL, and turn on the drx-RetransmissionTimerSL when the drx-HARQ-RTT-TimerSL times out.

Step 32: During drx-InactivityTimerSL timeout and drx-RetransmissionTimerSL operation period, the receiver terminal does not receive the PSCCH scheduling signal for continuing to schedule transmission, and the receiver terminal's drx-RetransmissionTimerSL times out, the receiver terminal will enter the dormant period for DRX cycle 2. Then when the drx-RetransmissionTimerSL times out, the receiver terminal stops sensing the side link resources.

As a specific implementation: the MAC layer of the receiver terminal notifies the PHY layer to stop sensing for the side link resource indicated by the first information, or the PHY determines that the drx-RetransmissionTimerSL corresponding to the drx-RetransmissionTimerSL is not received during the operation of the drx-RetransmissionTimerSL For the service data of the sender terminal, the PHY automatically stops sensing for the side link resource indicated by the first information, and at the same time, the MAC stops by default the sensing for the side link resource indicated by the first information has stopped.

Step 33: During the operation of drx-RetransmissionTimerSL, the receiver terminal receives the sidelinkdrx command MAC CE, and the receiver terminal enters the dormant period for DRX cycle 2. When the receiving terminal receives the sidelinkdrx command MAC CE, the receiving terminal stops sensing the sidelink resources described in the case 1-2-2.

As a specific implementation: the MAC layer of the receiver terminal notifies the PHY to stop sensing for the sidelink resources indicated by the first information, or the PHY determines that the sidelinkdrx command MAC CE is received during the drx-RetransmissionTimerSL operation period, then the PHY The sensing for the first information is automatically stopped, and at the same time, the MAC defaults to stop the sensing for the first information has stopped.

Case 3-3. Combining the above case 1-1, if the receiver terminal is in the active period of DRX cycle 2, if the receiver terminal receives the side link discontinuous reception command MAC CE, then the receiver terminal is in the DRX Enter the dormant period in cycle 2, and stop sensing the side link resources. Or, if the receiving terminal does not receive the PSCCH scheduling signal for scheduling service data during the active period of DRX cycle 2, after the active period of DRX cycle 2 ends, the receiving terminal enters the dormant period and stops sensing the side chain Road resources.

In the case that the receiver terminal can select the side link resource from the resource pool, the receiver terminal can provide the sender terminal with first information to indicate to the sender terminal the side link resource on which the receiver terminal can receive data. However, because the receiver terminal adopts the DRX mechanism, in order to prevent the receiver terminal from using the first information to recommend to the sender terminal, the side link resources for sending data are located in the dormant period of the receiver terminal and do not belong to the receiver terminal. During the activation period, the receiver terminal should stop the sensing of the current DRX cycle when the receiver terminal is about to enter the dormant period, so as to avoid providing information about the side link resources in the dormant period of the receiver terminal, so as to be the receiver terminal. The purpose of power saving.

The foregoing mainly introduces the solution of the embodiment of the present application from the perspective of interaction between various network elements. It can be understood that, in order to implement the foregoing functions, each network element, such as the first terminal, includes a corresponding structure and/or software module for performing each function. Those skilled in the art should easily realize that in combination with the units and algorithm steps of the examples described in the embodiments disclosed herein, the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a certain function is executed by hardware or computer software-driven hardware depends on the specific application and design constraint conditions of the technical solution. Professionals and technicians can use different methods for each specific application to implement the described functions, but such implementation should not be considered beyond the scope of this application.

In the embodiment of the present application, the first terminal may divide the functional units according to the foregoing method example. 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 above-mentioned integrated unit can be implemented in the form of hardware or software functional unit. It should be noted that the division of units in the embodiments of the present application is illustrative, and is only a logical function division, and there may be other division methods in actual implementation.

The method of the embodiment of the present application is described above in conjunction with FIG. 6 to FIG. 11, and the communication device provided in the embodiment of the present application for performing the foregoing method is described below. Those skilled in the art can understand that the method and the device can be combined and quoted with each other, and the communication device provided in the embodiment of the present application can execute the steps executed by the terminal and the network device in the above analysis method.

In the case of adopting an integrated unit, FIG. 12 shows the communication device involved in the foregoing embodiment, and the communication device may include: a communication module 1213 and a processing module 1212.

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

In an example, the communication device is the 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 (for example, a second terminal). For example, the communication module 1213 is configured to perform the signal transceiving operation of the terminal in the foregoing method embodiment. The processing module 912 is configured to perform the signal processing operation of the terminal in the foregoing method embodiment.

For example, the communication module 1213 is configured to execute the sending action performed by the first terminal in step 603 of FIG. 6 in the foregoing embodiment. The processing module 1212 is configured to support the communication device to perform the actions performed by the first terminal in step 601 to step 602 in FIG. 6.

Among them, the processing module 1212 may be a processor or a controller, for example, 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 devices, transistor logic devices, Hardware components or any combination thereof. It can implement or execute various exemplary logical blocks, modules, and circuits described in conjunction with the disclosure of this application. The processor may also be a combination of computing functions, for example, a combination of one or more microprocessors, a combination of a digital signal processor and a microprocessor, and so on. The communication module can be a transceiver, a transceiver circuit, or a communication interface. 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 device involved in the present application may be the communication device shown in FIG. 2.

FIG. 13 is a schematic structural diagram of a chip 130 provided by an embodiment of the present application. The chip 130 includes one or more (including two) processors 1310 and a communication interface 1330.

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

In some embodiments, the memory 1340 stores the following elements, execution modules or data structures, or their subsets, or their extended sets.

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

One possible implementation manner is that the first terminal and the second device have similar structures, and different devices can use different chips to implement their respective functions.

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

The memory 1340 may include a read-only memory and a random access memory, and provides instructions and data to the processor 1310. A part of the memory 1340 may also include NVRAM. For example, in an application, the memory 1340, the communication interface 1330, and the memory 1340 are coupled together through a bus system 1320, where the bus system 1320 may include a power bus, a control bus, and a status signal bus in addition to a data bus. However, for clarity of description, various buses are marked as the bus system 1320 in FIG. 13.

The method disclosed in the foregoing embodiment 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 with signal processing capabilities. In the implementation process, each step of the above method can be completed by an integrated logic circuit of hardware in the processor 1310 or instructions in the form of software. The aforementioned processor 1310 may be a general-purpose processor, a digital signal processing (digital signal processing, DSP), an ASIC, an off-the-shelf programmable gate array (field-programmable gate array, FPGA) or other programmable logic devices, discrete gates or transistors. Logic devices, discrete hardware components. The methods, steps, and logical block diagrams disclosed in the embodiments of the present application can be implemented or executed. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor or the like. The steps of the method disclosed in the embodiments of the present application may be directly embodied as being executed and completed by a hardware decoding processor, or executed and completed by a combination of hardware and software modules in the decoding processor. The software module can be located in a mature storage medium in the field, such as random access memory, flash memory, read-only memory, programmable read-only memory, or electrically erasable programmable memory, registers. The storage medium is located in the memory 1340, and the processor 1310 reads the information in the memory 1340, and completes the steps of the foregoing method in combination with its hardware.

In a possible implementation manner, the communication interface 1330 is used to perform the receiving and sending steps of the first terminal in the embodiment shown in FIG. 6. The processor 1310 is configured to execute the processing steps of the first terminal in the embodiment shown in FIG. 6.

The above communication module may be a communication interface of the device, which is used to receive signals from other devices. 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 or send signals from other chips or devices.

In one aspect, a computer-readable storage medium is provided. The computer-readable storage medium stores instructions. When the instructions are executed, the functions executed by the first terminal as shown in FIG. 6 and FIG. 7 are realized.

On the one hand, a computer program product including instructions is provided. The computer program product includes instructions. When the instructions are executed, the functions performed by the first terminal in FIG. 6 and FIG. 7 are realized.

On the one hand, 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. A function performed by a terminal.

An embodiment of the present application provides a communication system, which includes: a first terminal and a second terminal. Among them, the first terminal is used to perform the functions performed by the first terminal in FIG. 6 and FIG. 7, and the second terminal is used to perform the functions performed by the second terminal in FIG. 6 and FIG. 7.

In the above embodiments, it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented by software, it can be implemented in the form of a computer program product in whole or in part. The computer program product includes one or more computer programs or instructions. When the computer program or instruction is loaded and executed on the computer, the process or function described in the embodiment of the present application is executed in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, network equipment, user equipment, or other programmable devices. The computer program or instruction 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 instruction may be transmitted from a website, a computer, or The server or data center transmits to another website site, computer, server or data center through wired or wireless means. The computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server or a data center that integrates one or more available media. The usable medium may be a magnetic medium, such as a floppy disk, a hard disk, and a magnetic tape; it may also be an optical medium, such as a digital video disc (digital video disc, DVD); and it may also be a semiconductor medium, such as a solid state drive (solid state drive). , SSD).

Although the present application is described in conjunction with various embodiments, in the process of implementing the claimed application, those skilled in the art can understand and realize the disclosure by looking at the drawings, the disclosure, and the appended claims. Other changes to the embodiment. In the claims, the word "comprising" does not exclude other components or steps, and "a" or "one" does not exclude a plurality. A single processor or other unit may implement several functions listed in the claims. Certain measures are described in mutually different dependent claims, but this does not mean that these measures cannot be combined to produce good results.

Although the application has been described in combination with specific features and embodiments, it is obvious that various modifications and combinations can be made without departing from the spirit and scope of the application. Correspondingly, the specification and drawings are merely exemplary descriptions of the application as defined by the appended claims, and are deemed to cover any and all modifications, changes, combinations or equivalents within the scope of the application. Obviously, those skilled in the art can make various changes and modifications to the application without departing from the spirit and scope of the application. In this way, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalent technologies, this application is also intended to include these modifications and variations.

Claims

A method for determining side link resources, characterized in that it is applied to a first terminal, and the first terminal has an active state and a dormant state, and the method includes:

Perceive side link resources;

Determining information about candidate side link resources located in a first time period, during which the first terminal is in the active state;

Send first information to the second terminal, where the first information is information for indicating side-link resources, and the side-link resources are all or part of the side-link resources in the candidate side-link resources Road resources.
The method according to claim 1, wherein the first terminal includes a media access control MAC layer and a physical layer PHY, and the sensing side link resource includes:

Sending, by the MAC layer, a perception indication and information for indicating a first time period to the PHY, where the perception indication is used for notifying the PHY to perceive the side link resource;

The determining information about candidate side link resources located in the first time period includes:

The PHY determines the information of the candidate side link resource within the first time period from the sensed side link resources, and the PHY reports the information of the candidate side link resource to The MAC layer.
The method according to claim 2, wherein the first terminal adopts a discontinuous reception DRX mechanism, and the DRX mechanism includes an active period and a sleep period,

The sending by the MAC layer to the PHY a perception indication and information used to indicate the first time period includes:

The MAC layer sends a perception indication and information for indicating a first time period to the PHY at a first time, the first time is within the dormant period, and the first time is within the first time Period before, the first time period is within the activation period.
The method according to claim 3, wherein the sending the first information to the second terminal comprises:

The first information is sent to the second terminal at a second time, the second time is within the dormant period, and the second time is before the first time period.
The method according to claim 2, wherein the first terminal adopts a discontinuous reception DRX mechanism, and the DRX mechanism includes an active period and a sleep period,

The sending by the MAC layer to the PHY a perception indication and information used to indicate the first time period includes:

Sending, by the MAC layer, a perception indication and information for indicating a first time period to the PHY at a first moment, and the first terminal is in the 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 to maintain the activated state of the first terminal.
The method according to claim 5, wherein the method further comprises:

During the operation of any timer corresponding to the active 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 uplink control channel in the active state.
The method according to claim 5, wherein the method further comprises:

When the second timer expires, the first terminal starts the first timer, the first terminal monitors the retransmission data of the service data during the operation of the first timer, and the first terminal The time is the time when the first timer is started, and the second timer represents the minimum waiting time before the first terminal starts to receive the retransmission data of the service data.
The method according to claim 7, wherein the method further comprises:

During the operation of any timer corresponding to the active state, if the PSCCH scheduling signal is not successfully demodulated, the first terminal starts the second timer.
The method according to any one of claims 1 to 8, wherein the method further comprises:

In the case that the first terminal is in the active state and receives the side link discontinuous reception command MAC CE, it stops sensing the side link resources; or,

If the first terminal does not receive the PSCCH scheduling signal for scheduling service data during the activation period or before the first timer expires, it stops sensing the side link resource.
The method according to claim 7 or 8, wherein the method further comprises:

When the third timer expires and the first timer is running, the PSCCH scheduling signal for continuing to schedule the service data is not received, and when the first timer expires, stop sensing the side link Resource; or, during the running of the first timer, receiving the side link discontinuous reception command MAC CE, stop sensing the side link resource.
The method according to claim 9 or 10, wherein the stopping sensing of the side link resource comprises: the MAC layer sends a stop sensing instruction to the PHY, and the PHY stops sensing according to the stop sensing instruction. Instruct to stop sensing the side link resource; or, the PHY automatically stops sensing the side link resource.
The method according to any one of claims 5 to 11, wherein the sending of the first information by the first terminal to the second terminal comprises:

The first terminal sends the first information to the second terminal before the first timer expires and before the side link resource fails.
The method according to any one of claims 1 to 12, wherein the quality of the side link resource is greater than or equal to a preset threshold, or the side link resource is allocated by the candidate side link The channel busy rate CBR of the resource is determined, and/or the side link resource is determined by the number of resources for transmitting the first information.
A computer-readable storage medium, characterized in that instructions are stored in the readable storage medium, and when the instructions are executed, the method according to any one of claims 1 to 13 is implemented.
A chip, characterized in that the chip comprises a processor, the processor is coupled with a communication interface, and the processor is used to run a computer program or instruction to implement the method according to any one of claims 1 to 13 The communication interface is used to communicate with other modules outside the chip.
A terminal, characterized by comprising: at least one processor, the at least one processor is coupled with the memory, and the at least one processor is configured to run instructions stored in the memory to execute any one of claims 1-13. The method described.