CN113645680B

CN113645680B - Method, device and system for determining side uplink resource

Info

Publication number: CN113645680B
Application number: CN202010787192.0A
Authority: CN
Inventors: 张梦晨; 刘云; 邝奕如; 徐海博
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2020-04-27
Filing date: 2020-08-05
Publication date: 2023-10-20
Anticipated expiration: 2040-08-05
Also published as: CN113645680A

Abstract

The embodiment of the application provides a method, a device and a system for determining side uplink resources, which relate to the technical field of communication and are used for realizing that a receiver terminal provides auxiliary information for 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 side uplink resources are perceived. Information of candidate side-link resources located within a first time period during which the first terminal is in the active state is determined. And transmitting first information to a second terminal, wherein the first information is used for indicating information of side link resources, and the side link resources are all or part of the candidate side link resources. The scheme can be suitable for the fields of unmanned driving, automatic driving, auxiliary driving, intelligent driving, internet access driving, intelligent internet access driving, automobile sharing and the like.

Description

Method, device and system for determining side uplink resource

The present application claims priority from chinese patent application filed on 27 months 04 in 2020, filed on national intellectual property office with application number 202010345081.4, application name "a method for providing auxiliary information and UE", the entire contents of which are incorporated herein by reference.

Technical Field

The embodiment of the application relates to the technical field of communication, in particular to a method, a device and a system for determining side uplink resources.

Background

In a long term evolution (long time evolution, LTE) system or a New Radio (NR) system, data can be transmitted between terminals through side uplink resources. Specifically, when a sender terminal (Tx UE) transmits traffic data to a receiver terminal (Rx UE), the Rx UE may perceive (send) side-link resources in a resource pool to determine target side-link resources. The Rx UE then transmits side information to the Tx UE, which indicates the target side uplink resource selected by the Rx UE. The Tx UE may then consider the side information sent by the Rx UE when making the side-link resource selection. For example, the Tx UE selects a side-link resource for transmitting traffic data to the Rx UE from among target side-link resources, which may improve the data reception quality of the Rx UE.

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

Disclosure of Invention

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

In order to achieve the above purpose, the application adopts the following technical scheme:

in a first aspect, an embodiment of the present application provides a method for determining a side uplink resource, where the method is applied to a first terminal, where the first terminal has an active state and a dormant state, and the method provided by the embodiment of the present application includes: the first terminal perceives the side uplink resources. The first terminal determines information of candidate side uplink resources located within a first time period in which the first terminal is in an active state. The first terminal transmits first information to the second terminal, the first information being information indicating side-link resources, the side-link resources being all or part of the candidate side-link resources.

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

In one possible implementation, taking the example that the first terminal includes a medium access control MAC layer and a physical layer PHY, the first terminal perceives side uplink resources, comprising: the MAC layer transmits a perception indication to the PHY, and information indicating a first period of time, the perception indication informing the PHY to perceive the side-link resources. The first terminal determining information of candidate side uplink resources located within a first time period, comprising: the PHY determines information of the candidate side link resources located in the first time period from the perceived side link resources, and the PHY reports the information of the candidate side link resources to the MAC layer.

In one possible implementation, the first terminal employs a discontinuous reception DRX mechanism, where the DRX mechanism includes an active period and a sleep period, and the MAC layer sends a sensing indication and information for indicating a first period to the PHY, including: the MAC layer transmits a perception indication and information for indicating a first period of time to the PHY at a first time, where the first time is located in a sleep period and the first time is located before the first period of time, and where the first period of time is located in an active period. It is understood that the active period of the first period and the sleep period of the first time are located in different DRX cycles, for example, the sleep period is a sleep period in the first DRX cycle, and the active period of the first period is an active period in the second DRX cycle, where the first DRX cycle is located before the second DRX cycle, and optionally, the first DRX cycle is adjacent to the second DRX cycle. And triggering the PHY to start resource sensing by using the sensing indication, so as to avoid that the first terminal is always in a resource sensing state. In this scheme, before the activation period in the second DRX cycle starts, the MAC layer of the first terminal informs the PHY layer to start perceiving the side uplink resource and indicates to the PHY to report the side uplink resource in the activation period in the second DRX cycle as a candidate side uplink resource.

In one possible implementation, the first terminal sends first information to the second terminal, including: the first terminal sends first information to the second terminal at a second moment. The second time is within the sleep period and the second time is before the first time period. The timeliness of the first information is ensured.

In one possible implementation, the first terminal employs a discontinuous reception, DRX, mechanism that includes an active period and a sleep period, the MAC layer sending a perceived indication to the PHY and information for indicating a first period of time, comprising: the MAC layer transmits a perception indication and information for indicating a first period of time to the PHY at a first time, and the first terminal is in an active state at the first time. The first time period is a timing duration of a first timer of the first terminal, and the first timer is used for maintaining an activation state of the first terminal. Because the first terminal maintains the activation state of the first terminal during the operation period of the first timer, the first terminal can detect service data in the operation period of the first timer, so that the first terminal can indicate the side uplink resource located in the operation period of the first timer to the second terminal by using the first information.

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

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

Starting the first timer in the above-described scheme means that the range of the side uplink resource information provided by the first terminal to the second terminal by using the first information is expanded, and the range of the side uplink resource of the service data from the second terminal is also expanded by the first terminal.

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

In a possible implementation manner, the method provided by the embodiment of the application further includes: and under the condition that the first terminal is in an activated state, if the first terminal receives a side uplink discontinuous reception command (MAC CE), the first terminal stops sensing the side uplink resource. Alternatively, in a possible implementation manner, the method provided by the embodiment of the application further includes: the first terminal does not receive a PSCCH scheduling signal for scheduling traffic data during an active period or before the first timer expires, and the first terminal stops perceiving the side-link resources.

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

In a possible implementation manner, the method provided by the embodiment of the application further includes: the first terminal does not receive a PSCCH scheduling signal for scheduling traffic data during the active period or before the first timer expires, and the first terminal stops perceiving the side-link resources at the end of the active period or when the first timer expires.

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

In one possible implementation, the first terminal stops perceiving the side uplink resource, comprising: and the MAC layer sends a stopping perception instruction to the PHY, and the PHY stops perceiving the side link resource according to the stopping perception instruction. Alternatively, in one possible implementation, the first terminal stops perceiving the side uplink resource, including: the PHY automatically stops perceiving the side-link resources.

In one possible implementation, the first terminal sends first information to the second terminal, including: the first terminal sends first information to the second terminal before the first timer expires and before the side-link resource fails. The availability of side-uplink resources is ensured.

In one possible implementation, the quality of the sidelink resources is greater than or equal to a preset threshold, or the sidelink resources are determined by a channel busy rate CBR of the candidate sidelink resources, and/or the sidelink resources are determined by the number of resources transmitting the first information.

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

In a second aspect, an embodiment of the present application provides a method for determining a side uplink resource, the method including: the second terminal receives information from the first terminal indicating the side uplink resource. The second terminal selects a target side uplink resource from the side uplink resources to transmit traffic data.

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

an example, the communication apparatus is a first terminal or a chip system applied in the first terminal, the first terminal having an active state and a dormant state, the communication apparatus comprising: and the processing unit is used for sensing the side uplink resource. And the processing unit is used for determining information of candidate side uplink resources positioned in a first time period, wherein the first terminal is in an activated state in the first time period. And the communication unit is used for sending first information to the second terminal, wherein 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.

In one possible implementation, taking an example that the first terminal includes a medium access control MAC layer and a physical layer PHY, the processing unit is configured to perceive a side uplink resource, including: the MAC layer transmits a perception indication to the PHY, and information indicating a first period of time, the perception indication informing the PHY to perceive the side-link resources. A processing unit configured to determine information of candidate side uplink resources located within a first time period, comprising: the PHY determines information of the candidate side link resources located in the first time period from the perceived side link resources, and the PHY reports the information of the candidate side link resources to the MAC layer.

In one possible implementation, the first terminal employs a discontinuous reception DRX mechanism, where the DRX mechanism includes an active period and a sleep period, and the MAC layer sends a perceived indication to the PHY and information for indicating the first period of time, including: the MAC layer transmits a perception indication and information for indicating a first period of time to the PHY at a first time, where the first time is located in a sleep period and the first time is located before the first period of time, and where the first period of time is located in an active period. It is understood that the active period of the first period and the sleep period of the first time are located in different DRX cycles, for example, the sleep period is a sleep period in the first DRX cycle, and the active period of the first period is an active period in the second DRX cycle, where the first DRX cycle is located before the second DRX cycle, and optionally, the first DRX cycle is adjacent to the second DRX cycle. And triggering the PHY to start resource sensing by using the sensing indication, so as to avoid that the first terminal is always in a resource sensing state. In this scheme, before the activation period in the second DRX cycle starts, the MAC layer of the first terminal informs the PHY layer to start perceiving the side uplink resource and indicates to the PHY to report the side uplink resource in the activation period in the second DRX cycle as a candidate side uplink resource.

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

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

In a possible implementation manner, when the second timer expires, the processing unit is configured to start the first timer, where the first terminal listens for the retransmission data of the service data during the operation of the first timer, the first time is the time of starting the first timer, and the second timer indicates the minimum waiting time before the first terminal starts to receive the retransmission data of the service data. At this point, the first terminal will remain listening to the retransmitted traffic data from the second terminal during the first timer running. For example, the first timer is drx-retransmission timer SL.

In one possible implementation manner, during the running 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 may schedule retransmission data transmitted on a side-link between a first terminal and a second terminal.

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

In one possible implementation, the processing unit is configured to stop perceiving the side uplink resource at a time when the communication unit receives the side uplink discontinuous reception command MAC CE in a case where the first terminal is in an active state.

In one possible implementation, the communication unit does not receive a PSCCH scheduling signal for scheduling traffic data before the activation period or the first timer expires, and the processing unit is configured to stop perceiving the side-link resource at the end of the activation period or when the first timer expires.

In one possible implementation, the processing unit is configured to stop perceiving the side-link resource when the first timer expires, if the communication unit does not receive the PSCCH scheduling signal to continue scheduling traffic data during the time-out of the third timer and the first timer is running. Alternatively, the communication unit receives a side-link discontinuous reception command MAC CE during operation of the first timer, and the processing unit is configured to stop perceiving the side-link resource.

In one possible implementation, the processing unit is configured to stop perceiving the side uplink resource, and includes: the processing unit sends a stop perception instruction to the processing unit through the MAC layer through the PHY of the first terminal, and the PHY of the first terminal stops perceiving the side link resource according to the stop perception instruction. Alternatively, in a possible implementation, the processing unit is configured to stop perceiving the side uplink resource, and includes: the processing unit automatically stops perceiving the side uplink resources through the PHY of the first terminal.

In one possible implementation, the communication unit is configured to send the first information to the second terminal before the first timer expires and before the side uplink resource fails. The availability of side-uplink resources is ensured.

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

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

In a fourth aspect, embodiments of the present application provide a communication device, which may implement the method in the second aspect or any possible implementation manner of the second aspect, and thus may also implement the beneficial effects in the second aspect or any possible implementation manner of the second aspect. The communication device may be the second terminal, or may be a device supporting the second terminal to implement the second aspect or any possible implementation of the second aspect, e.g. a chip applied in the second terminal. The communication device may implement the above method by software, hardware, or by hardware executing corresponding software.

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

For example, 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 may be an input/output interface, pins or circuitry, etc. The processing unit executes instructions stored by the storage unit to cause the second terminal to implement the second aspect or a method of determining side uplink resources described in any one of the possible implementations of the second aspect. The memory unit may be a memory unit (e.g., a register, a cache, etc.) in the chip, or a memory unit (e.g., a read-only memory, a random access memory, etc.) in the second terminal that is located outside the chip.

In a fifth aspect, embodiments of the present application provide a computer readable storage medium having stored therein a computer program or instructions which, when run on a computer, cause the computer to perform a method of determining a sidelink resource as described in any of the possible implementations of the first aspect to the first aspect. The computer may be a first terminal.

In a sixth aspect, embodiments of the present application provide a computer readable storage medium having stored therein a computer program or instructions which, when run on a computer, cause the computer to perform a method of determining side-link resources as described in any one of the possible implementations of the second aspect to the second aspect. The computer may be a second terminal.

In a seventh aspect, embodiments of the present application provide a computer program product comprising instructions which, when run on a computer, cause the computer to perform a method of determining side-link resources as described in the first aspect or in various possible implementations of the first aspect.

In an eighth aspect, embodiments of the present application provide a computer program product comprising instructions which, when run on a computer, cause the computer to perform a method of determining side-link resources as described in the second aspect or in various possible implementations of the second aspect.

In a ninth aspect, embodiments of the present application provide a communication device for implementing various methods in various possible designs of any of the above first to second aspects. The communication device may be the above-mentioned first terminal, or a device comprising the above-mentioned first terminal, or a component (e.g. a chip) applied in the first terminal. Alternatively, the communication device may be the above-described second terminal, or a device including the above-described second terminal, or the communication device may be a component (e.g., a chip) applied in the second terminal. The communication device comprises corresponding modules and units for realizing the method, and the modules and units can be realized by hardware, software or realized by executing corresponding software by hardware. The hardware or software includes one or more modules or units corresponding to the functions described above. It should be understood that the communication apparatus described in the ninth aspect may further include: a bus and a memory for storing 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 apparatus including: at least one processor. Wherein at least one processor is coupled to the memory, the processor executing computer-executable instructions or programs stored in the memory when the communication device is operated to cause the communication device to perform the method as described in the first aspect or any of the various possible designs of the first aspect. For example, the communication device may be the first terminal, or a chip applied in the first terminal.

In an eleventh aspect, an embodiment of the present application provides a communication apparatus including: at least one processor. Wherein at least one processor is coupled to the memory, the processor executing computer-executable instructions or programs stored in the memory when the communication device is operated to cause the communication device to perform the method of any of the various possible designs of the second aspect or any of the second aspect as described above. For example, the communication device may be the second terminal, or a chip applied in the second terminal. It should be understood that the memory described in any of the tenth to eleventh aspects may also be replaced with a storage medium, which is not limited by the embodiments of the present application.

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

In a twelfth aspect, embodiments of the present application provide a communications device, where the communications device includes one or more modules for implementing the method of any one of the first aspect and the second aspect, where the one or more modules may correspond to the steps of the method of any one of the first aspect and the second aspect.

In a thirteenth aspect, embodiments of the present application provide a chip system comprising a processor for reading and executing a computer program stored in a memory to perform the method of the first aspect and any possible implementation thereof. Alternatively, the chip system may be a single chip, or a chip module composed of a plurality of chips. Optionally, the chip system further comprises a memory, and the memory is connected with the processor through a circuit or a wire. Further optionally, the chip system further comprises a communication interface. The communication interface is used for communicating with other modules outside the chip.

In a fourteenth aspect, embodiments of the present application provide a chip system comprising a processor for reading and executing a computer program stored in a memory to perform the method of the second aspect and any possible implementation thereof. Alternatively, the chip system may be a single chip, or a chip module composed of a plurality of chips. Optionally, the chip system further comprises a memory, and the memory is connected with the processor through a circuit or a wire. Further optionally, the chip system further comprises a communication interface. The communication interface is used for communicating with other modules outside the chip.

In a fifteenth aspect, an embodiment of the present application provides a communication system including: a first terminal and a second terminal. Wherein the first terminal is adapted to perform the method of the first aspect and any of its possible implementations, and the second terminal is adapted to perform the method of the second aspect and any of its possible implementations.

Any of the apparatuses or computer storage media or computer program products or chips or communication systems provided above are used to perform the corresponding methods provided above, and thus, the advantages achieved by the methods can refer to the advantages of the corresponding schemes in the corresponding methods provided above, and are not described herein.

Drawings

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

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

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

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

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

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

Fig. 6 and fig. 7 are schematic flow diagrams of a method for determining a side uplink resource according to an embodiment of the present application;

fig. 8 to 11 are schematic diagrams of determining a side uplink resource by a receiver terminal in different situations provided in the embodiments of the present application;

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

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

Detailed Description

In order to clearly describe the technical solution of the embodiments of the present application, in the embodiments of the present application, the words "first", "second", etc. are used to distinguish the same item or similar items having substantially the same function and effect. For example, the first terminal and the second terminal are merely for distinguishing different terminals, and the order of the different terminals is not limited. It will be appreciated by those of skill in the art that the words "first," "second," and the like do not limit the amount and order of execution, and that the words "first," "second," and the like do not necessarily differ.

In the present application, the words "exemplary" or "such as" are used to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary" or "for example" should not be construed as preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "such as" is intended to present related concepts in a concrete fashion.

The technical scheme of the application can be applied to various communication systems, such as: long term evolution (long time evolution, LTE) systems, LTE frequency division duplex (frequency division duplex, FDD) systems, LTE time division duplex (time division duplex, TDD) systems, universal mobile telecommunications system (universal mobile telecommunication system, UMTS), worldwide interoperability for microwave access (worldwide interoperability for microwave access, wiMAX) communication systems, public land mobile network (public land mobile network, PLMN) systems, device-to-device (D2D) network systems or machine-to-machine (machine to machine, M2M) network systems, 5G communication systems, internet of vehicles systems, and the like.

The network architecture and the service scenario described in the embodiments of the present application are for more clearly describing the technical solution of the embodiments of the present application, and do not constitute a limitation on the technical solution provided by the embodiments of the present application, and those skilled in the art can know that, with the evolution of the network architecture and the appearance of the new service scenario, the technical solution provided by the embodiments of the present application is applicable to similar technical problems. The embodiment of the application is exemplified by the application of the method provided in an NR system or a 5G network.

In the present application, "at least one" means one or more, and "a plurality" means two or more. "and/or", describes an association relationship of an association object, and indicates that there may be three relationships, for example, a and/or B, and may indicate: a alone, a and B together, and B alone, wherein a, B may be singular or plural. The character "/" generally indicates that the context-dependent object is an "or" relationship. "at least one of" or the like means any combination of these items, including any combination of single item(s) or plural items(s). For example, at least one (one) of a, b, or c may represent: a, b, c, a-b, a-c, b-c, or a-b-c, wherein a, b, c may be single or plural. The mappings herein, the associations may have the same meaning.

Before describing the embodiments of the present application, the terms involved in the embodiments of the present application will be described first:

1) Side Link (SL) refers to: defined for direct communication between terminals. I.e. the link between the terminal and the terminal that communicates directly without forwarding through the base station.

2) The sidelink resource refers to: resources used in the transmission of side-link traffic data (including data packets and control signaling) on the side-link between terminals. The side uplink service data in the embodiment of the application can also be simply called: service data or V2X service.

3) A schematic diagram of a discontinuous reception (discontinuous reception, DRX) mechanism is shown in fig. 5a, where time is divided into successive DRX cycles (DRX cycles) in the time domain. The DRX cycle includes an active period (clocked with DRX-onduration) and a sleep period. During the active period, the terminal device listens to the physical downlink control channel (physical downlink control channel, PDCCH). In the sleep period, the terminal does not monitor and receive the downlink signal, so as to save power consumption.

4) The active period refers to the time when a DRX-Oncdulationtimer runs at the beginning of a DRX cycle defined in the standard, and the terminal is in an active state in the active period.

5) Sleep period refers to the time after the DRX-onduration timer times out in a DRX cycle defined in the standard, and the terminal is in a sleep state during the sleep period.

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

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

It should be noted that, if the terminal has no other timer for maintaining the active state, the active state is the state in which the terminal is in during the active period. The sleep state is a state in which the terminal is in during the sleep period.

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

7) In the dormant state, the terminal cannot monitor service data (possibly monitor other data, such as sensing side uplink resources in the dormant state in the application), and does not detect PDCCH or PSCCH in the dormant state so as to save electric quantity.

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

In order to improve the safety and the intellectualization of the traffic system, the system concept of intelligent traffic is gradually rising. In recent years, development of intelligent transportation systems has been mainly focused on the field of intelligent highway transportation systems, namely, commonly known as internet of vehicles (vehicle to everything, V2X). V2X communications include vehicle-to-vehicle (vehicle to vehicle, V2V) communications, vehicle-to-road side infrastructure (vehicle to infrastructure, V2I) communications, and vehicle-to-pedestrian communications (vehicle to people, V2P) communications. V2X applications will improve driving safety, reduce congestion and vehicle energy consumption, and increase traffic efficiency. Such as traffic lights, school zones, and railroad crossings. The internet of vehicles system is a side-link transmission technology based on long term evolution (long term evaluation, LTE) V2V or new air interface V2V, and adopts a terminal-to-terminal direct communication mode, unlike the traditional LTE system or the mode that communication data is received or transmitted through network equipment in NR.

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

Among them, the terminal 10 and the terminal 20 have a first interface for direct communication, which may be referred to as a PC5 interface. The transmission link on the PC5 interface for the communication between the terminal 10 and the terminal 20 may be referred to as a sidelink.

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

The above-described terminal 10 and terminal 20 may communicate over resources on a side link between the terminal 10 and terminal 20. The scenario in which the terminal 10 and the terminal 20 communicate on the side uplink may be referred to as: in the scenario of sidelink communication, as an example, in the embodiment of the present application, the resources used by the terminal 10 and the terminal 20 to communicate on the side uplink may be referred to as: the embodiment of the application does not limit the specific names of the resources on the side of the uplink, and can be set according to the needs.

Taking the example of terminal 10 transmitting side-link traffic data to terminal 20 using side-link resources, terminal 10 may now acquire side-link resources in the following manner. The manner in which the terminal 20 obtains the side uplink resource may refer to the manner in which the terminal 10 obtains the side uplink resource, which will not be described in detail later.

Mode1 (mode 1), resource allocation mode of network scheduling.

mode 1: in a radio resource control (radio resource control, RRC) connected state, the terminal 10 performs data transmission with a network device, and then the network device in communication with the terminal 10 may schedule side uplink resources for the terminal 10 for transmitting side uplink traffic data. For example, the terminal 10 transmits a scheduling request (scheduling request, SR) and a sidelink buffer status report (buffer status reporting, BSR) to the network device. The sidelink BSR is used to determine the sidelink communication data size of the terminal 10. Based on the sidelink BSR, the network device may determine the sidelink communication data size of the terminal 10 and schedule sidelink resources for the terminal 10 required for transmitting sidelink traffic data. Wherein the network device uses the configured side-link radio network temporary identity (SL-radio network tempory identity, SL-RNTI) to schedule side-link resources for the sidelink communication.

Mode2 (mode 2), the resource selection mode autonomously selected by the terminal.

mode2, terminal 10 selects a sidelink resource from a resource pool (typically comprising one or more sidelink resources). For example, the resource pool is broadcast by the network device in the system information when the terminal 10 is within network coverage. The resource pool may be a pre-configured resource pool for the terminal 10 when the terminal 10 is outside the network coverage. The resource pool may be a specific resource pool for the terminal 10, i.e. only the terminal 10 may select side-uplink resources in the resource pool. Or the resource pool may be a resource pool shared by a plurality of terminals including the terminal 10, that is, other terminals than the terminal 10 may select a sidelink resource in the resource pool. In regard to the latter, when the terminal 10 autonomously selects a sidelink resource in the resource pool, the terminal 10 may perform a sense on the resource pool to select the sidelink resource.

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

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

In V2X communication based on LTE or NR, the terminal 10 may acquire a sensing result using or based on a sensing procedure defined in the LTE Release 14 standard protocol. Illustratively, the perceived result of the side-link resource may be used to indicate any one or more of the following: the identity or location of a particular sidelink resource in the resource pool, the signal strength on the sidelink resource, the signal power on the sidelink resource, and the channel busy rate (channel busy ratio, CBR) of the sidelink resource.

As shown in fig. 1, fig. 1 illustrates a scenario provided by an embodiment of the present application, as shown in fig. 1, taking a vehicle identified as X (simply referred to as a vehicle X) as an example, if the vehicle X decides to perform an overtaking operation, the vehicle X may send service data (for example, the service data may be an overtaking indication, a current vehicle speed of the vehicle X (for example, 75 km/h)) in a dialog box 30 on a side link resource to a terminal 20 located in front of the vehicle X (for example, the vehicle identified as Y (simply referred to as a vehicle Y)) so that the vehicle Y may travel at a reduced speed after receiving the current vehicle speed of the X and the overtaking indication, so as to make the X safely overtake. Before the terminal 10 transmits traffic data to the terminal 20, the terminal 10 may select a side uplink resource from a transmission resource pool.

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

It should be noted that, the side uplink resources included in the transmission resource pool and the reception resource pool in the embodiment of the present application may be partially identical or all identical. The transmission resource pool and the reception resource pool are relative concepts, and if the terminal 10 selects a side uplink resource in the resource pool 1 for transmitting traffic data to the terminal 20, the resource pool 1 is a transmission resource pool for the terminal 10 and a reception resource pool for the terminal 20. In addition, since the terminal 20 itself may have a need to transmit service data, the reception resource pool is mainly used to distinguish from the "resource pool used when the terminal 20 is used as a data transmitting end", and the reception resource pool of the terminal 20 is the transmission resource pool of the terminal 10.

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

The terminal 10 or 20 is a device with wireless communication capability that may be deployed on land, including indoors or outdoors, hand held or vehicle mounted. Can also be deployed on the water surface (such as a ship, etc.). But may also be deployed in the air (e.g., on aircraft, balloon, satellite, etc.). Terminals, also called User Equipment (UE), mobile Stations (MSs), mobile Terminals (MT), and terminal equipment, etc., are devices that provide voice and/or data connectivity to a user. For example, the terminal includes a handheld device, an in-vehicle device, and the like having a wireless connection function. Currently, the terminal may be: a mobile phone, a tablet, a laptop, a palmtop, a mobile internet device (mobile internet device, MID), a wearable device (e.g., a smartwatch, a smartband, a pedometer, etc.), a vehicle-mounted device (e.g., an automobile, a bicycle, an electric car, an airplane, a ship, a train, a high-speed rail, etc.), a Virtual Reality (VR) device, an augmented reality (augmented reality, AR) device, a wireless terminal in an industrial control (industrial control), a smart home device (e.g., a refrigerator, a television, an air conditioner, an electric meter, etc.), a smart robot, a workshop device, a wireless terminal in a drone (self driving), a wireless terminal in a teleoperation (remote medical surgery), a wireless terminal in a smart grid (smart grid), a wireless terminal in a transportation security (transportation safety), a wireless terminal in a smart city (smart city), or a wireless terminal in a smart home (smart home), a flying device (e.g., a smart robot, a hot balloon, an airplane, etc. In one possible application scenario of the present application, the terminal is a terminal that is often operated on the ground, such as a vehicle-mounted device. In the present application, for convenience of description, a Chip disposed in the above-described device, such as a System-On-a-Chip (SOC), a baseband Chip, etc., or other chips having a communication function may also be referred to as a terminal.

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

As an example, in an embodiment of the present application, the terminal may also be a wearable device. The wearable device can also be called as a wearable intelligent device, and is a generic name for intelligently designing daily wear by applying wearable technology and developing wearable devices, such as glasses, gloves, watches, clothes, shoes and the like. The wearable device is a portable device that is worn directly on the body or integrated into the clothing or accessories of the user. The wearable device is not only a hardware device, but also can realize a powerful function through software support, data interaction and cloud interaction. The generalized wearable intelligent device includes full functionality, large size, and may not rely on the smart phone to implement complete or partial functionality, such as: smart watches or smart glasses, etc., and focus on only certain types of application functions, and need to be used in combination with other devices, such as smart phones, for example, various smart bracelets, smart jewelry, etc. for physical sign monitoring.

A network device is an entity that can be used to transmit or receive signals for use with a terminal. For example, it may be an Access Point (AP) in a WLAN, and may also be an evolved base station (evolvedNodeB, eNB or eNodeB) in Long Term Evolution (LTE), or a relay station or an access point, or a vehicle device, a wearable device, and a network device in a fifth Generation mobile communication technology (5 th Generation mobile networks or 5th Generation wireless systems, 5th-Generation, abbreviated as 5G) network (may also be referred to as new radio, NR)), or a network device in a PLMN network of future evolution, and so on. The network device in the embodiment of the application can be a base station. As an example, the network device may be an evolved base station (evolvedNodeB, eNB or eNodeB) in a fourth generation communication technology (the 4Generation mobile communication technology,4G) system. The terminal 200 is a terminal that can perform information transmission with the eNB. As another example, the network device may be a next generation node B (thenextgenerationNodeB, gNB) in an NR system, and the terminal 10 or the terminal 20 may be a terminal that can perform information transmission with the gNB.

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

Fig. 2 shows a schematic hardware structure of a communication device according to an embodiment of the present application. The hardware structures of the first terminal and the second terminal in the embodiment of the present application may refer to the structure shown in fig. 2. The communication device comprises a processor 21, a communication line 24 and at least one transceiver (illustrated in fig. 2 by way of example only as comprising a transceiver 23).

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

Communication line 24 may include a pathway to communicate information between the aforementioned components.

The transceiver 23 uses any transceiver-like means for communicating with other devices or communication networks, such as ethernet, radio access network (radio access network, RAN), wireless local area network (wireless local area networks, WLAN), etc.

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

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

The memory 22 is used for storing computer-executable instructions for executing the present application, and is controlled by the processor 21. The processor 21 is configured to execute computer-executable instructions stored in the memory 22 to implement a method for determining side-link resources provided by the embodiments of the present application described below.

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

In a particular implementation, as one embodiment, processor 21 may include one or more CPUs, such as CPU0 and CPU1 of FIG. 2.

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

Based on the above description of the perception, in the scenario of the actual mode2 resource allocation in the sidelink transceiving, taking the terminal 10 as the sender terminal (Tx UE), the terminal 20 as the receiver terminal (Rx UE) as an example, communication is performed between the terminal 10 and the terminal 20 through the sidelink, and before the terminal 10 sends the service data to the terminal 20, the terminal 10 can reserve the sidelink resource from the resource pool through the perception. Because the sidelink resources are perceived by the terminal 10 in the resource pool by itself and available sidelink resources are selected based on the perceived result of the terminal 10 on the resource pool, the terminal 10 can select the sidelink resources with better quality, thereby ensuring 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 age corresponding to the service data, that is, the sidelink resource is located in the resource reservation age corresponding to the service data, and the terminal 10 may not reserve resources located outside the resource reservation age. For example, when the service data of the terminal 10 is a periodic service, the terminal 10 may reserve the sidelink resource within the resource reservation age time corresponding to the periodic service. When the service data of the Tx UE is aperiodic service, the Tx UE may reserve sidelink resources within the resource reservation period corresponding to the aperiodic service. For example, as shown in fig. 3, taking the example of the resource reservation time t < 100ms corresponding to the periodic service as an example, the terminal 10 may reserve the sidelink resource within 100 ms. Taking the example of the resource reservation time t < 32ms corresponding to the aperiodic service, the terminal 10 can reserve the sidelink resource within 32 ms.

The resource reservation time corresponding to the service data in the embodiment of the present application may refer to: the valid time range of the side-link resource, i.e. in which time period the side-link resource is valid and in which time period the side-link resource is not valid. If the side-link resource is valid during or before the time period a, the terminal 10 may transmit the service data using the side-link during or before the time period a. Outside of or after the period a, the side-link resource is not valid, and the terminal 10 cannot transmit traffic data using the side-link resource.

In order to further improve the communication quality of the Rx UE receiving the service data in the mode2 resource allocation, for the above-described sidelink communication scenario, the terminal 20 may further provide auxiliary information for the terminal 10 when the terminal 10 sends the service data to the terminal 20. The terminal 20 here provides the auxiliary information because: the terminal 10 selects the side-link resources mainly from its own point of view, and does not consider whether the selected side-link resources are equally applicable to the terminal 20. Specifically, the terminal 10 is located at a different location than the terminal 20. And due to the different locations, the interference suffered by the terminal 10 and the terminal 20 on the same sidelink resource may be different, for example, due to the different locations of the terminal 10 and the terminal 20, the CBR measured by the terminal 10 and the terminal 20 for the same channel may be different, that is, the communication quality of the two on the same side uplink resource may be different. For example, as shown in fig. 4, the terminal 10 and the terminal 20 perform sending on the same resource pool. In practice, time-frequency resource 1 in the resource pool is already occupied by terminal a and time-frequency resource 2 is already occupied by terminal b. The terminal 20 is closer to the terminal a and the terminal b, and the terminal 20 can detect signals transmitted by the terminal a and the terminal b, namely, for the terminal 20, the occupation condition of the resource pool is as follows: both time-frequency resource 1 and time-frequency resource 2 are occupied. The distance between terminal 10 and terminal a is relatively short, but the distance between terminal 20 and terminal b is relatively long, so that there may be the following cases: the terminal 10 may detect the signal transmitted by the terminal a, but not the signal transmitted by the terminal b, and the occupation condition of the resource pool is as follows for the terminal 10: the time-frequency resource 1 is occupied. It follows that, due to the different locations of terminal 10 and terminal b, different communication quality may be caused for different terminals on the same resource. If the subsequent terminal 10 selects the time-frequency resource 2 as the side-uplink resource to transmit the service data to the terminal 20, the quality of the service data received by the terminal 20 may be affected.

Currently, when a terminal communicates with a network device, in order to save unnecessary power consumption of the terminal and reduce the listening time of the terminal, a discontinuous reception mechanism is applied on a Uu port (an interface between the terminal and the network device) to help the terminal in a radio resource control (radio resource control, RRC) connected state save energy. The basic principle of DRX is: when a terminal communicates with a network device, the network device may have data to transmit for a period of time, and the network device may have no data to transmit to the terminal for a subsequent longer period of time. In the case that the network device does not transmit data to the terminal, if the terminal still maintains the listening state, it is very power consuming for the terminal. Therefore, when the terminal does not receive data, the power consumption of the terminal can be reduced by stopping the terminal from monitoring the physical downlink control channel (physical downlink control channel, PDCCH), thereby improving the battery use time of the terminal.

Specifically, when the terminal adopts the DRX mechanism, the terminal is configured with a DRX cycle (cycle) including two periods of time as shown in fig. 5 a: an active period (on duration) and a dormant period (opportunity for DRX) (which may also be referred to as an inactive period). The terminal listens to the physical downlink control channel (physical downlink control channel, PDCCH) during the on duration, i.e. the period of time during which the terminal listens to the PDCCH channel is called the active period. During the active period, the terminal will switch on the receiver, which may be regarded as a constant concept. In "opportunity for DRX", the terminal does not monitor PDCCH, but the terminal can transmit information (such as the first information in the present application or traffic data to other terminals or traffic data to the base station) as well as the sensing-side and selecting-side downlink resources. When there is no data transmission, the terminal may turn off the receiver, thereby reducing terminal power consumption. As can be seen from fig. 5a, the longer the time for DRX sleep, the lower the power consumption of the terminal.

In addition, the active state includes a period in which the other DRX-related timer is in an active state and the receiver should be turned on. The other timers refer to any one of a DRX duration timer (DRX-onduration timer), a DRX inactivity timer (DRX-InactigityTimer), a DRX downlink retransmission timer (DRX-retransmission Timer DL), a DRX uplink retransmission timer (DRX-retransmission Timer UL), or a random access contention resolution timer (ra-contentResoltTimer) being in an operation state. ra-contentioresolute refers to a timer used by a terminal in a random access process, and is used for running any timer (timer) in the process that the terminal waits for obtaining access resources of a base station). For example, when the DRX duration timer, or the DRX inactivity timer, or the DRX downlink retransmission timer or the DRX uplink retransmission timer is running, the terminal is in an active state. That is, the DRX duration timer, or the DRX inactivity timer, or the DRX downlink retransmission timer (DRX-retransmission timer dl) or the DRX uplink retransmission timer (DRX-retransmission timer ul) is in the DRX active period (active time) during which the terminal needs to blindly detect the PDCCH, in other words, the active period can also be regarded as a time when the terminal is in an active state.

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

DRX duration timer (DRX-onduration timer) the duration of the on duration at the beginning of the DRX cycle may be considered as the active state (also called "awake state") of the terminal during its operation.

DRX slot offset (DRX-SlotOffset) is the delay before DRX-onduration timer is turned on.

The DRX inactivity timer (DRX-InactivityTimer) is continuously in an active state for a period of time after the terminal successfully decodes a PDCCH scheduled for new data primary transmission on a Uu port, i.e. after the terminal is scheduled, the DRX-InactivityTimer should be turned on to prolong the time that the terminal is in the active state, and the corresponding scenario can be understood that the terminal is likely to be continuously scheduled in a next period of time when the terminal is currently scheduled, so that the terminal needs to keep the active state to wait for receiving data.

DRX downlink retransmission timer (DRX-retransmission timer dl) (for each downlink hybrid automatic repeat request (hybrid autonomous repeat request, HARQ) process except for the broadcast process): and the maximum duration before the terminal receives the downlink retransmission data of the Uu port, and the terminal waits for receiving the downlink retransmission data from the network equipment in the drx-retransmission timerdl operation.

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

DRX long cycle on offset (DRX-longcycletartoffset): a Long DRX Cycle (Long DRX Cycle) specifying the number of subframes/ms occupied by the Long Cycle and a DRX-start offset specifying the Long DRX Cycle and the start subframe of the short DRX Cycle are represented.

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

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

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

DRX uplink HARQ round trip timer (DRX-HARQ-RTT-TimerUL) (for each uplink HARQ process): the duration of the terminal before expecting to receive the uplink HARQ retransmission resource on the Uu port can be understood as a time window, in which the terminal cannot perform uplink retransmission on the data packet with current transmission failure, and after waiting for the drx-HARQ-RTT-timer ul timeout, the terminal can continue uploading the data of the data packet. When the drx-HARQ-RTT-TimerUL of the terminal is timed out, the terminal can start uplink retransmission, and the drx-retransmission TimerUL is started.

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

any one timer (timer) of the case 1, the drx-onduration timer or the drx-incarvitytimer or the drx-retransmission timer dl or the drx-retransmission timer ul or the random access contention resolution timer (ra-contentdimer) is in an operation state. The ra-contentionresolution timer refers to a timer used by the terminal in the random access process, and is used for the terminal to wait for obtaining access resources of the base station.

It should be noted that, for the above case 1, if only the drx-onduration timer is counted in the above timer, but the other timers are not counted, that is, the active state of the terminal in the embodiment of the present application may refer to the state of the terminal in the active period.

The activation state of the terminal can be considered to be prolonged when the drx-InactivityTimer, drx-retransmission timer DL or the drx-retransmission timer UL runs, i.e. the drx-InactivityTimer, drx-retransmission timer DL or the drx-retransmission timer UL is a timer for prolonging the activation 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 and the operation period of each of the timers.

Case 2, the terminal has sent a scheduling request (scheduling request, SR) on the physical uplink control channel (physical uplink control channel, PUCCH), and the SR is currently in a pending state, which may be understood as the terminal is ready but has not yet sent an SR to the network device.

Case 3, similar to ra-contentioresolute, the terminal successfully receives a random access response (random access response, RAR) for responding to a contention-based random access preamble (preamble) selected by a non-terminal, but does not receive a PDCCH indicating a primary transmission (using a cell radio network temporary identity (cell radio network temporary identifier,) C-RNTI).

Accordingly, 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 identity (radio network temporaryidentifier, RNTI): cell RNTI (C-RNTI), configured scheduling RNTI (CS-RNTI), interrupt RNTI (interrupt-RNTI, time slot format identifier RNTI (slot format indicator-RNTI, SFI-RNTI), semi-permanent 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), and heuristic reference signal transmit power control RNTI (transmit power control-sounding reference signal-RNTI, TPC-SRS-RNTI).

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

It should be further noted that, in addition to the above cases, the activation period may include other cases specified in future communication protocols, which are not particularly limited by the embodiments of the present application.

While the present Tx UE and the Rx UE perform side-link communication, the specific possible scenarios include, but are not limited to, V2X communication, device to device (D2D), public safety (public safety), commercial communication (commercial), and other sidelink related communication scenarios, where the Rx UE continuously monitors the PSCCH transmitted by the Tx UE during the whole period of time without using the DRX mechanism, and the Rx UE continuously maintains the active state and can receive the scheduling data transmitted by the Tx UE. In some scenarios, such as unicast scenarios, or multicast scenarios with feedback, the Rx UE may 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 may be in the whole time range, that is, the sensing range of the Rx UE is also in the whole time range, which is very power consuming for the Rx UE. Wherein, unicast scene refers to: one Tx UE transmits traffic data to one Rx UE, but one Tx UE may simultaneously establish a sidelink connection with a plurality of Rx UEs. A multicast scenario is that a plurality of terminals form a group (group), and the terminals in the group communicate with each other, and the terminals in the same group can receive all data or information in the group.

As described above, in the current sidelink communication, the Rx UE continuously detects the PSCCH (the PSCCH may be a PSCCH corresponding to service data transmitted by the Tx UE, or may be a PSCCH detected in the process of performing transmission on the reception resource pool by the Rx UE in order to provide auxiliary information), and even if there is no data transmitted by the Tx UE, the Rx UE does not need to receive service data from the Tx UE, or the Rx UE does not need to provide auxiliary information to the Tx UE, the Rx UE still maintains a continuously monitored state, so that the power of the Rx UE is very consumed.

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

However, when the Rx UE configures the DRX mechanism, the Rx UE receives the service data from the Tx UE only during the active period, and in order to ensure that the Rx UE can receive the service data on the side uplink resource 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 located in the time period when the terminal is in the active state. In other words, in order for the Rx UE to provide the auxiliary information to the Tx UE, the Rx UE does not have to continuously sense over the entire time range, and since the time domain location of the side uplink resource indicated by the auxiliary information should be located in the time period in which the Rx UE is in the active state, the range of the Rx UE for sensing the resource in order to provide the auxiliary information should also be a certain range. In addition, since the perceived result is aged, the Rx UE, after applying the DRX mechanism: how to start sensing to ensure that the time domain position of the side uplink resource indicated in the auxiliary information is in the time period when the Rx UE is in the active state is a technical problem to be solved.

For example, as shown in fig. 5b, the Rx UE selects the sidelink resource 501 located in the resource sensing window from the sensed sidelink resources, but the sidelink resource 501 is located before the time 1, and the time 1 refers to the time when the active period starts, that is, the sidelink resource 501 is located in the sleep period of the Rx UE, and cannot receive the traffic data from the Tx UE, and then the sidelink resource 501 is an invalid sensing result. For another example, the Rx UE selects the sidelink resource 502 located in the resource sensing window from the sensed sidelink resources, and the sidelink resource 502 is located in the active period of the Rx UE, i.e. the sidelink resource 502 may be a resource for the Rx UE to receive traffic data from the Tx UE, so the sidelink resource 502 is an effective sensing result. As also shown in fig. 5 b: the period of time between the resource sensing window and the resource selection window (i.e., the period X1 in fig. 5 b) is opportunity for DRX, when the Rx UE is in a sleep period, the Rx UE does not change from the sleep state to the active state to receive traffic data during the sleep period according to its configured DRX cycle, so that it is not necessary to provide the assistance information, and thus the Rx UE may stop sensing the side uplink resources indicated by the assistance information.

The resource sensing window in the embodiment of the application refers to: a time period during which the receiver terminal or the sender terminal performs side-uplink resource awareness.

The resource selection window in the embodiment of the application refers to: the receiving terminal or the transmitting terminal selects a time period of a resource for transmitting traffic data or a resource for receiving traffic data from the perceived side uplink resources.

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

Further, to reduce the time for the Rx UE to perform the sensing in order to provide the information of the side uplink resource, the Physical Layer (PHY) may be notified by the medium access control (medium access control, MAC) Layer of the Rx UE to start the sensing and notify the valid sensing result range (e.g., the first period) corresponding to the current sensing.

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

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

Mode 2, network device configures DRX parameters for Rx UE. For example, the network device actively configures DRX parameters for the Rx UE. As another example, it may also be that the network device configures DRX parameters for the Rx UE based on the request of the Rx UE.

Mode 3, DRX parameters are preconfigured in the Rx UE.

Mode 4, the DRX parameters of the Rx UE are predefined by the standard protocol, i.e. the DRX parameters are predefined in the standard protocol in the Rx UE.

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

Mode 6, the DRX parameter and the service type have a mapping relationship, for example, the Rx UE needs to receive the service data of the service type, and then the Rx UE can use the DRX parameter.

Mode 7, rx UE configures the DRX parameters.

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

the sidelink DRX duration timer (DRX-onduration SL), the duration of which is on duration, at the beginning of the DRX cycle. During the on duration, the Rx UE is in an active state.

The sidelink DRX slot offset (DRX-SlotOffsetSL) is the delay before DRX-onduration timer is turned on.

The Sidelink DRX inactivity timer (DRX-InactyTimerSL) is the length of time that the Rx UE is active after successfully decoding PSCCH on which a Tx UE schedules new data for initial transmission. That is, after the Rx UE is scheduled by the Tx UE, the Rx UE should turn on the Drx-InactigityTimerSL corresponding to the Tx UE to extend the time that the Rx UE is in the active state, in other words, when the Sidelink Drx-inactivity timer starts to run, the active state of the Rx UE is extended or maintained, that is, the extended time of the active state of the Rx UE is the duration of the Sidelink Drx inactivity timer, and the corresponding scenario may be understood that the Rx UE is likely to continue to be scheduled in the next time period when the Rx UE is currently scheduled, so that the Rx UE needs to continue to maintain the active state to wait for receiving data;

The maximum duration before the Rx UE receives the sidelink retransmission data from the Tx UE, is the sidelink DRX retransmission timer (DRX-retransmission timer sl) in which the Rx UE waits to receive the retransmission data sent by the Tx UE on the sidelink. In other words, the active state of the Rx UE is extended or maintained when the sidelink Drx-retransmission timer starts to run.

The maximum duration before the Rx UE receives the sidelink hybrid automatic repeat request (hybrid automatic repeat request, HARQ) feedback retransmission side uplink resource corresponding to the Tx UE, that is, the length of time that needs to be waited before the Tx UE receives Acknowledgement (ACK) message/non-acknowledgement (NACK) message feedback data sent by the Rx UE, in which the Rx UE performs sidelink HARQ feedback.

The sidelink DRX Long period open offset (DRX-Long Cycle offset SL) represents both the Long DRX Cycle and the DRX-StartOffsetSL. Where Long DRX Cycle specifies the number of subframes/millisecond occupied by a Long period. The DRX-startoffsetslt specifies the start subframes of the long and short DRX cycles;

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

a sidelink DRX Short period timer (optional) wherein Rx UE is in the time length of the Short DRX period, and the unit is the number of Short DRX cycles;

drx-HARQ-RTT-TimerSL the duration before the Rx UE expects to receive the sidelink HARQ retransmission data of the Tx UE on sidelink. The drx-HARQ-RTT-timer sl may be understood as a time window, in which the Tx UE does not retransmit the service data that is currently transmitted and needs to wait for the drx-HARQ-RTT-timer sl to timeout, and then the Rx UE can continue to receive the retransmission data of the service data. When the drx-HARQ-RTT-timer sl of the Rx UE times out, the Rx UE may start receiving retransmission data for the traffic data from the Tx UE, and then turn on drx-retransmission timer dl.

The duration of time before the Rx-HARQ-RTT-TimerSLL Rx UE expects to receive the sidelink HARQ retransmission resource on the sidelink can be understood as a time window. In the time window, the Rx UE cannot feed back the service data which is failed in the current transmission, and the Rx UE feeds back the service data sent by the Tx UE after waiting for the drx-HARQ-RTT-TimerSLL to be overtime. That is, the Rx UE starts to transmit ACK/NACK feedback after the duration of the time window for the parameter since the last Acknowledgement (ACK)/negative acknowledgement (Negative acknowledgement, NACK) feedback transmission, which is equivalent to a limitation on ACK/NACK feedback, avoiding that the Rx UE always transmits feedback data.

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

either the drx-onduration timersl or drx-incaactyitytimersl or drx-remosmissiontimersl or drx-remossiontimersl or ra-contentdeigntimer. The ra-contentionresolution timer is a timer used by the Rx UE in the random access process, and is used for the Rx UE to wait for obtaining the access resource 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 (physical uplink control channel, PUCCH) and the SR is currently in a pending state, which may be understood as the Rx UE is ready but has not yet sent an SR to the network device.

Similar to ra-contentioresolutiontimer, the Rx UE successfully receives the RAR for the preamble for contention-based random access in response to the non-Rx UE selection, but does not receive the PDCCH indicating the initial transmission using C-RNTI scrambling.

The Rx UE does not keep the active state continuously because the Rx UE is configured with the DRX mechanism, so the first information provided by the Rx UE for assisting the Tx UE in selecting resources is required in the time domain.

A method for determining side-link resources provided by an embodiment of the present application will be specifically described with reference to fig. 6 to 10.

It should be noted that, in the following embodiments of the present application, a name of a message between each network element or a name of each parameter in a message is only an example, and in specific implementations, other names may also be used, which is not limited in particular by the embodiments of the present application.

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

The technical solution provided in the embodiment of the present application is described in detail below by taking the first terminal as a receiving terminal and the second terminal as a transmitting terminal as an example. It should be understood that in the embodiment of the present application, the specific structure of the execution body of a method of determining a side link resource is not particularly limited as long as communication can be performed in a method of determining a side link resource according to the embodiment of the present application by running a program in which a code of a method of determining a side link resource of the embodiment of the present application is recorded. For example, an execution subject of a method for determining a side uplink resource provided in an embodiment of the present application may be a functional module in a receiver terminal capable of calling a program and executing the program, or a communication device, such as a chip, a chip system, an integrated circuit, or the like, applied in the receiver terminal. The chips, the chip system and the integrated circuit can be arranged in the terminal of the receiver or independent relative to the terminal of the receiver, and the embodiment of the application is not limited. The execution body of the method for determining the side uplink resource provided in the embodiment of the present application may be a functional module in the sender terminal that can call a program and execute the program, or a communication device applied in the sender terminal, for example, a chip system, an integrated circuit, etc., where the chip, the chip system, the integrated circuit may be disposed inside the sender terminal, or may be independent with respect to the sender terminal, and the embodiment of the present application is not limited.

As shown in fig. 6, fig. 6 shows an interaction embodiment of a method for determining a side uplink resource according to an embodiment of the present application, where the method includes:

step 601, the receiving terminal perceives the side uplink resource.

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

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

It may be appreciated that, in the embodiment of the present application, the receiver terminal and the sender terminal can perform side uplink 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 period.

For example, the receiving terminal may employ a discontinuous reception mechanism so that the receiving terminal is in a power saving mode, which is not limited by the embodiment of the present application. The concept of the discontinuous reception mechanism is described above, and the embodiment of the present application is not limited thereto.

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

In the embodiment of the application, the receiving terminal can not receive the service data in the dormant state, but can send the data or signaling, such as sending the first information.

The receiver terminal in the embodiment of the application can perceive the side uplink resource in the receiving resource pool. The so-called receive resource pool refers to: the recipient terminal can receive a resource pool of traffic data (e.g., retransmission data or new transmission data). The resource pool is used for a 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 reception resource pool for the receiver terminal and a transmission resource pool for the transmitter terminal.

The newly transmitted data is the data that the sender terminal or other terminal first (first) transmits to the receiver terminal. Retransmission data is data transmitted to a receiving terminal by a sender terminal or other terminals for the Mth time. In other words retransmission data, i.e. data that the sender terminal or other terminal did not first transmit to the receiver terminal. M is an integer greater than or equal to 2, and M is less than or equal to the maximum number of retransmissions of the data transmitted by the sender terminal.

Step 602, the receiving terminal determines information of candidate side uplink resources located in a first period, and the receiving terminal is in an active state in the first period.

It will be appreciated that the candidate sidelink resources are all or part of all of the sidelink resources perceived by the recipient terminal. The number of candidate side-link resources in the embodiments of the present application is one or more.

Step 603, the receiving terminal sends the first information (e.g. auxiliary information) to the sending terminal, and correspondingly, the sending terminal receives the first information from the receiving terminal. The first information is information indicating side-uplink resources. The side-link resources are all or part of the candidate side-link resources.

The number of side-uplink resources in embodiments of the present application may be one or more.

Illustratively, the first information includes information of the side-link resource. For example, the side-link resource may be a time-frequency resource. Then, the information of the side-link resource may include a subchannel (sub-channel) number, a subframe number, a slot (slot), or the like.

Of course, the information of the side uplink resource may further include: the priority of the side-link resource, the channel busy rate of the side-link resource.

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

For example, the first message may be an RRC message, a MAC layer control element (MAC control element, MAC CE), side uplink control information (sidelink control information, SCI), or the like. For example, the first message includes a first field for indicating time domain information of the side-link resource and a second field for indicating frequency domain information of the side-link resource, wherein the time domain information may include a subframe number and/or slot, and the frequency domain information may include a subframe number, in other words, the first information is the first field and the second field. As another example, the first message includes a field that may directly indicate the side uplink resource.

In the above scheme in the embodiment of the present application, the side uplink resource provided by the receiver terminal to the sender terminal is located in the first time period, and because the receiver terminal is in the active state in the first time period, the side uplink resource provided by the receiver terminal to the sender terminal by using the first information can be located in the time period corresponding to the receiver terminal in the active state, so that when the receiver terminal has both the dormant state and the active state, the receiver terminal is prevented from providing the sender terminal with the information of the side uplink resource which does not belong to the active time range corresponding to the active state by using the first information. In addition, the side link resource is provided by the receiver terminal to the sender terminal, and the quality of data received by the side link resource can be fully considered by the receiver terminal when the side link resource is provided, so that the data from the sender terminal can be received on the side link resource subsequently, and the communication quality of the receiver terminal can be improved. Furthermore, in the scheme, the power saving effect for the receiver terminal can be achieved because the receiver terminal has both the dormant state and the active state.

As a possible embodiment, the method provided by the embodiment of the present application may further include, after step 603: the sender terminal selects a 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 downlink, 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 with respect to the sender terminal according to the first information may be achieved by: the sender terminal determines the side uplink resource indicated by the first information according to the first information. The sender terminal then selects the target side-link resource based on the priority of the side-link resource or the signal quality or CBR or time domain location. Taking the example that the side link resources include the side link resource 1 and the side link resource 2, if the priority of the side link resource 1 is higher than the priority of the side link resource 2, or if the signal quality of the side link resource 1 is higher than the signal quality of the side link resource 2, or if the time domain position of the side link resource 1 is located before the time domain position of the side link resource 2, the sender terminal takes the side link resource 1 as the target side link resource, and then sends the service data to the sender terminal using the side link resource 1. Of course, if the time interval between the time of the service data to be transmitted by the sender terminal and the time domain position of the side link resource 1 is smaller than the time interval between the time domain position of the side link resource 2, the sender terminal can ensure that the service data is transmitted to the receiver terminal as soon as possible by selecting the side link resource 1 to transmit the service data.

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

In step 701, the MAC layer sends a perception indication and information for indicating the first period to the PHY, and the PHY receives the perception indication from the MAC layer and the information for indicating the first period.

Wherein the perceived indication is used to inform the PHY that the side-link resources are perceived.

In the embodiment of the present application, the sensing indication is used to inform the PHY that the sensing indication senses the side uplink resource immediately after receiving the sensing indication or the sensing indication is used to inform the PHY that the sensing of the side uplink resource is started at the designated time after receiving the sensing indication, which is not limited in the embodiment of the present application.

In a possible embodiment, the sensing indication in step 701 of the embodiment of the present application may be omitted, that is, if the MAC layer sends information indicating the first period to the PHY, the PHY is implicitly indicated to sense the side downlink resource by the information indicating the first period, so that the PHY may determine the sensing side downlink resource after receiving the information indicating the first period.

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

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

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

As a possible embodiment, the method in the embodiment of the present application may further include, before step 701: after considering the service type of the service data and the resource reservation timeliness corresponding to the service type, the MAC layer of the receiving terminal informs the physical layer to start to perceive the side uplink resource.

For example, the service type may be that the service data is periodic or aperiodic, service data arrival characteristics, time delays, and so forth.

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

In step 702, the PHY determines information of candidate side link resources located in the first period from the perceived side link resources, and the PHY reports the information of the candidate side link resources to the MAC layer, and accordingly, the MAC layer obtains, from the physical layer, the information of the candidate side link resources located in the first period.

In the embodiment of the application, the PHY receives the sensing instruction from the MAC layer to sense the side uplink resource immediately or at the appointed time. If the PHY perceives the side-link resources located in the first period from the reception resource pool, the PHY reports perceived information of the side-link resources located in the first period, i.e., information of candidate side-link resources, to the MAC layer.

It may be appreciated that the PHY starts to sense the sidelink resources immediately after receiving the sensing indication or starts to sense the sidelink resources after a specified time, and then the PHY reports the sidelink resources located in the first time period among all the sidelink resources sensed after receiving the sensing indication to the MAC layer as candidate sidelink resources. In other words, candidate sidelink resources located within the first time period may be considered as PHY-aware sidelink resources available to the transmitting receiver terminal to transmit traffic data to the receiving receiver terminal.

The candidate side link resource in the embodiment of the application refers to that the time domain position of the candidate side link resource is located in the first time period.

It may be appreciated that, in the case that the PHY in the embodiment of the present application receives the awareness indication, not only the side uplink resources in the first period of time, but also the side uplink resources located outside the first period of time from the first time or the designated time point are also perceived.

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

The candidate side-link resources may be all or part of M candidate side-link resources perceived by the PHY from the first time or the designated time point to the end of the sensing, which is not limited by the embodiment of the present application.

Similarly, when the PHY reports the information of the candidate side uplink resource to the MAC layer, the interaction between the PHY and the MAC layer may be understood as depending on the implementation of the receiver terminal, which is not limited by the embodiment of the present application.

When the number of candidate side uplink resources is plural, the PHY reports information of the candidate side uplink resources to the MAC layer may be implemented in any of the following ways:

the mode a and the PHY report candidate side uplink resources located in the first time period to the MAC layer one by one.

For example, the PHY senses that the candidate side uplink resource a transmits a sensing result 1 to the MAC layer, and the sensing result 1 includes information of the candidate side uplink resource a. And then, the PHY senses the candidate side link resource b and sends a sensing result 2 to the MAC layer, wherein the sensing result 2 comprises the information of the candidate side link resource b, and the like until the PHY reports the information of all the candidate side link resources to the MAC layer.

And in the mode b, the PHY reports the information of part of candidate side uplink resources to the MAC layer, and then reports the information of the rest part of candidate side uplink resources to the MAC layer successively.

For example, in the mode b, if the PHY senses the candidate side uplink resource 1 to the candidate side uplink resource 4, the PHY transmits the sensing result 1 to the MAC layer, and the sensing result 1 includes information of the candidate side uplink resource 1 to the candidate side uplink resource 2. Subsequently, the PHY may report the information of the candidate side uplink resource 3 and the information of the candidate side uplink resource 4 to the MAC layer one by one.

Mode c, the PHY, the information of all candidate side uplink resources in the plurality of candidate side uplink 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 the mode c, the PHY transmits a sensing result including information of all candidate side uplink resources to the MAC layer. In the mode c, the information of all candidate side uplink resources may be carried in the same sensing result or may be carried in different sensing results.

Step 703, step 603 is not described herein.

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

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

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

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

For example, as shown in fig. 8, fig. 8 takes an example that DRX cycle 1 and DRX cycle 2 of the receiving terminal, DRX cycle 1 is located before DRX cycle 2, and DRX cycle 1 and DRX cycle 2 are adjacent. Before the on duration (i.e., T1 in fig. 8) in the DRX cycle 2 starts, the MAC layer of the receiving terminal considers the service type and the resource reservation age corresponding to the service type, and notifies the PHY to start sensing and sense that the corresponding target receiving resource range is the on duration at time n1 (i.e., the first time) in the sleep period in the DRX cycle 1. The period of time from the time n1 to the start time of the on duration in the DRX cycle 2 is the time corresponding to the time of the resource reservation, if the MAC layer sends a sensing indication to the PHY earlier than the time n1, it may cause the PHY to select the resource before the on duration in the DRX cycle 2, that is, select the resource of the receiver terminal in the sleep period in the DRX cycle 1. Therefore, the MAC layer sends a sensing indication to the PHY at time n1, so as to ensure that the resources selected by the PHY are located in the on duration of the DRX cycle 2, thereby saving energy consumption. The so-called target reception resource means a side uplink resource where the receiving side terminal can receive the traffic data from the second terminal.

The target reception resource range is a time domain position of a side uplink resource that can be used to receive service data transmitted by the transmitter terminal.

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

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

For example, when the service data sent by the sender terminal is a periodic service, the receiver terminal uses the first information to provide the side uplink resource to the sender terminal with a sidelink resource within the time corresponding to the time when the sidelink resource is reserved for the resource of the periodic service, i.e. t in fig. 8; when the service data sent by the sender terminal is non-periodic service, the receiver terminal uses the first information to provide the side uplink resource to the sender terminal with the sidelink resource within the time corresponding to the time of reserving the resource of the non-periodic service, namely t in fig. 8.

As a possible implementation manner, in the embodiment of the present application, the receiver terminal determines that the service data is an indication of a service identifier in signaling of a higher layer (such as a MAC layer or an RRC layer) or an indication of a reserved resource carried in SCI sent by the sender terminal that is monitored before, which is not limited in the embodiment of the present application. The receiver terminal can conveniently perceive the side uplink resource and provide effective auxiliary information by judging the service data to be periodic service or non-periodic service.

In case 1-1, in order to ensure timeliness of the subsequent receiver terminal transmitting the first information, the PHY reports the information of the candidate side uplink resource to the MAC layer may be implemented in the following manner:

In a possible embodiment, the side link resource in the embodiment of the present application may correspond to an effective period (determined by an effective start time and an effective expiration time), where the effective period corresponding to the side link resource indicates that the side link resource is available in the effective period, that is, the side link resource may be used as a resource for receiving service data by the receiver terminal in the effective period, where the side link resource may be considered to be effective. In other words, a side-link resource that is not within the active period may be considered to be inactive. A failure of a side-link resource means that the side-link resource is not available as a resource for the receiver terminal to receive traffic data. For example, if the valid time of the side link resource a is from time a to time L, the side link resource a can be considered valid before time L, and exceeding time L indicates that the side link resource a is invalid. The unified description herein, the following description refers to the number of times, and the following description is omitted.

Mode 1-1, the PHY reports information of candidate side uplink resources to the MAC layer before T1 (e.g., the PHY starts at least at time n2 or before time n2 in fig. 8) and/or before the candidate side uplink resources fail. It will be appreciated that time n1 is located before time n 2.

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

In case 1-1, as a possible implementation manner, the sending of the first information to the sender terminal by the receiver terminal in step 703 in the embodiment of the present application may be implemented by: the receiving terminal transmits the first information to the second terminal at a second time (e.g., time n2 in fig. 8), which is located before the first period of time and which is located in the sleep period. This ensures timeliness of the side uplink resources provided by the receiver terminal to the sender terminal.

In case 1-1, as another possible implementation manner, the sending of the first information to the sender terminal by the receiver terminal in step 703 in the embodiment of the present application may be implemented by: the recipient terminal sends first information to the second terminal before the first time period begins and before the side uplink resource fails. Reference may be made to the above description for how to determine a side-uplink resource failure, which is not repeated here.

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

in case 1-2-1, the first timer is a side uplink DRX inactivity timer (DRX-inactivity timer sl), and the first period is a timing duration of the first timer of the receiver terminal, where the first timer is used to maintain an active state of the receiver terminal. I.e. the first period is the timing duration of the side-uplink DRX inactivity timer. The timing length of the first timer means the duration of the first timer from the start to the end.

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

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

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

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

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

In case b, if the receiving terminal receives the PSCCH and demodulates it successfully during the on duration (i.e. T1 in fig. 9), as shown in fig. 9, the receiving terminal starts a first timer (for example, drx-incaivitytimersl, whose operation duration is T2) at time n4 (corresponding to the first time), and the receiving terminal will keep listening to the service data (i.e. new transmission data) sent by the sending terminal during operation of drx-incaivitytimersl, i.e. the activation state of the receiving terminal is maintained. Furthermore, the receiver terminal starting the first timer means that the range of the side uplink resources provided by the receiver terminal to the sender terminal is extended. That is, the time n4 is the start time of the drx-incarvitytimersl operation, and the receiver terminal maintains the active state from the time n4 to the stop time of the drx-incarvitytimersl operation.

While the receiving terminal receives the PSCCH and demodulates it successfully (time n4 in fig. 9, time n4 is within T1, and the receiving terminal is in an active state in T1), as another possible implementation manner, step 701 in the embodiment of the present application may be implemented by: 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 running time of drx-incactivity timer, i.e., T2 in fig. 9. The PHY of the receiver terminal performs sending based on the sensing instruction of the MAC layer, and if the PHY of the receiver terminal senses the side uplink resource in the T2, the PHY reports the information of the candidate side uplink resource in the T2 time range to the MAC layer. Alternatively, in the embodiment shown in fig. 9, at time n4, the MAC layer sends a perception notice to the notice PHY, the perception notice being used to indicate that the perception time is extended. Or at time n4, the MAC layer sends a awareness notification to the notification PHY, the awareness notification being for instructing the PHY to make side-link resource awareness and for indicating information for the first time period.

As can be appreciated in connection with fig. 9, at time n3 the MAC layer has notified the PHY to perform sensing, and the PHY also performs sensing, and due to the operation of the drx-incaivitytimer, at time n4 the MAC layer again notifies the PHY to perform sensing, the PHY will continue sensing, and report information of the side uplink resources located within the duration of the drx-incaivitytimer.

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

In case 1-2-1, the specific implementation of informing the PHY of the receiver terminal of starting to perceive resources by the MAC layer and informing the PHY that the range of the target receiving resources corresponding to the current perception is the duration of the drx-incaivitytimer currently running may refer to the manner of informing the PHY by the MAC layer in case 1-1, which is not described herein again.

In order to ensure the timeliness of the first information, and prevent the sender terminal from receiving the information of the side link resource, as a possible embodiment, as shown in fig. 9, in this case 1-2-1, in step 702 of the embodiment of the present application, the procedure of reporting the information of the candidate side link resource to the MAC layer by the PHY may be implemented by: the PHY transmits information of candidate side uplink resources to the MAC layer before the first timer expires and before the candidate side uplink resources fail.

For example, the PHY reports information of candidate side uplink resources to the MAC layer as a perceived result before drx-inactivatytimersl times out and before failure of the candidate side uplink resources. For example, if the drx-InactigityTimerSL has an operation time period of [5ms,20ms ], and the perceived result includes time-frequency resources with time domain time of 7ms,9ms,15ms,18ms as one or more candidate side-link resources, then it may be reasonable to: the PHY reports information of all candidate side uplink resources in the one or more candidate side uplink resources to the MAC layer at least 6ms, or the PHY reports time-frequency resources with a time domain time of 7ms to the MAC layer at 6ms, time-frequency resources with a time domain time of 9ms to the MAC layer at 8ms, and so on.

Unreasonable conditions are as follows: the PHY reports information of all of the one or more candidate side uplink resources to the MAC layer at 20ms, or the PHY reports time-frequency resources with a time domain time of 7ms to the MAC layer at 7ms, time-frequency resources with a time domain time of 9ms at 9ms, or the like.

The manner in which the PHY reports the candidate side uplink resource to the MAC layer may refer to the description related to the above case 1-1, and the embodiment of the present application is not described herein again.

In order to ensure timeliness of the first information, as a possible embodiment, in this case 1-2-1, the process of sending the first information to the sender terminal by the receiver terminal in the embodiment of the present application may be implemented by: the receiver terminal sends the first information to the sender terminal before the drx-incaactyittmersl times out and/or before the side-uplink resource fails.

In connection with 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 side uplink resource fails. Specific examples may refer to examples of reporting candidate side uplink resources to the MAC layer by the PHY, which are not described herein.

It should be noted that, in the above case 1-2-1, the receiving terminal determines whether the PSCCH is received during the on duration (i.e., T1 in fig. 9), but the above case still applies to: the behavior of the receiver terminal after the receiver terminal receives the PSCCH and successfully demodulates and starts the drx-incaactyitytimersl during the operation of the timer corresponding to the active state is not limited in this embodiment of the present application, in other words, any one of the timers corresponding to the active state may be any one of the following: drx-onduration TimerSL or drx-InactyityTimerSL or drx-RecranspossessionTimerSL or drx-RecranspossessionTimerSLL or ra-ContentionResolution Timer.

Case 1-2-2, the first time period is the duration of a first timer of the receiver terminal, which is started for the receiver terminal in case the receiver terminal determines to receive the retransmission data transmitted by the sender terminal on the side uplink in the active state. For example, the first timer is drx-retransmission timer SL. In fig. 10, the receiver terminal is in an active state during the T1 period, the T2 period, and the T3 period. The duration of drx-retransmission timer sl (which may also be referred to as a run time) is a period of time for which the receiver terminal continues to maintain the active state.

If the receiver terminal receives the PSCCH in the active state but does not demodulate the PSCCH successfully, the receiver terminal determines to receive retransmission data transmitted by the sender terminal on the side uplink in the active state.

As a possible embodiment, in case 1-2-2, the method provided by the embodiment of the present application may further include: and in the running process of any timer corresponding to the activation state of the receiver terminal, if the receiver terminal does not successfully demodulate the PSCCH scheduling signal, the receiver terminal starts a second timer and a third timer. The receiver terminal may also start the first timer when the second timer expires. The receiver terminal can listen for retransmission data during operation of the first timer. Wherein the receiver terminal maintains the activation state of the receiver terminal during the operation of the third timer, and the second timer indicates a minimum waiting time before the receiver terminal starts receiving the retransmission data of the service data.

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

To describe the case 1-2-2 in detail, further description will be made with reference to fig. 10, in which, as shown in fig. 10, at time n1 when the receiver terminal is in the sleep state, the MAC layer of the receiver terminal transmits a perception indication to the PHY of the receiver terminal, and T1. If the PHY of the receiver terminal perceives the side-link resource after the on duration (i.e., T1 in fig. 10) ends, the PHY of the receiver terminal reserves the perceived side-link resource located after T1 and determines whether the PSCCH scheduling signal is received and whether demodulation is successful.

Case c, same as case a, will not be described here again.

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

When the drx-HARQ-RTT-timer sl times out, the receiver terminal starts the drx-retransmission timer sl, i.e. the receiver terminal will monitor retransmission data sent by the sender terminal during the operation of the drx-retransmission timer sl, and at the same time means that the range of information of the side uplink resource provided by the receiver terminal to the sender terminal is extended.

Thus, in case 1-2-1, step 701 in an embodiment of the present application may be implemented by: at the same time when the receiver terminal turns on drx-retransmission timer sl (i.e., time n7 in fig. 10 corresponds to the first time described above), the MAC layer sends a perception indication to the PHY along with a T3 period. The T3 period is the duration of drx-retransmission timer sl operated by the receiver terminal.

The PHY starts sensing according to the sensing indication. And if the PHY senses candidate side uplink resources within the range of drx-retransmission TimerSL, reporting a sensing result to the MAC layer. The candidate side-link resources located within the T3 time period are included in the sensing result.

As can be appreciated in conjunction with fig. 10, at time n1, the MAC layer has notified the PHY to perform sensing, and the PHY also performs sensing, and since drx-retransmission timer sl is running, at time n7, the MAC layer notifies the PHY that sensing time is extended and sensing needs to be continued, and the PHY will continue to sense. After that, if PHY perceives the side-link resource located within the duration of drx-retransmission timer sl, the information of the side-link resource located within the duration of drx-retransmission timer sl is reported to the MAC layer. Alternatively, in the embodiment shown in fig. 10, at time n7, the MAC layer sends a perception notice to the notice PHY, the perception notice being used to indicate that the perception time is extended. Or at time n7, the MAC layer sends a awareness notification to the notification PHY, the awareness notification being for instructing the PHY to make side-link resource awareness and for indicating information for the first time period. The awareness notification may include only information for the first period of time and not an awareness indication, with the default awareness time extending after the PHY receives the information for the first period of time.

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

In order to ensure timeliness of sending the first information from the receiver terminal to the sender terminal, in case 1-2-1, the PHY reports the information of the candidate side uplink resource to the MAC layer may be implemented in the following manner: the PHY reports information of candidate side uplink resources to the MAC layer before the drx-retransmission timer sl times out and/or before the candidate side uplink resources perceived within T3 fail.

The manner in which the PHY reports the information of the perceived candidate side uplink resource to the MAC layer in this case 1-2-2 may refer to the description in the above embodiment, and will not be described in detail here.

In this case 1-2-2, the sending of the first information to the sender terminal by the receiver terminal in step 703 of the embodiment of the present application may be achieved by: the receiver terminal sends the first information to the sender terminal before the drx-retransmission timer sl times out and before the side-link resource fails. The specific example may refer to information reported to the MAC layer candidate side uplink resource by the PHY.

As shown in fig. 10, before the time n8 and before the failure of the side uplink resource, the receiver terminal transmits first information to the sender terminal.

It should be noted that, although in the above description for the present case, the description refers to the receiver terminal determining whether the PSCCH is received during the on duration operation, the above case is still applicable to the case that the receiver terminal is in the timer operation corresponding to the active state, and the receiver terminal receives the PSCCH and does not successfully demodulate and starts the drx-HARQ-RTT-timer sl. And when the drx-HARQ-RTT-TimerSL is timed out, the receiver terminal starts the behavior after the drx-retransmission TimerSL.

As a possible embodiment, the method provided by the embodiment of the present application may further include, before step 603: the recipient terminal screens and ranks the perceived candidate sidelink resources to determine a portion of the candidate sidelink resources from among the candidate sidelink resources as sidelink resources.

For example, if the number of candidate side uplink resources is plural, the plural candidate side uplink resources may also be ordered and filtered before the receiving terminal transmits the first information. For example, when the resources available to the receiver terminal for transmitting the first information are limited, the receiver terminal may screen out candidate side-link resources having a quality greater than or equal to the quality threshold from among the plurality of candidate side-link resources as side-link resources. Alternatively, when the number of the first information transmitted by the receiver terminal is limited, the receiver terminal may rank the quality of the plurality of candidate side uplink resources from top to bottom, and then select the candidate side uplink resource with the front quality as the side uplink resource according to the number of the first information transmitted. The receiver terminal may use, for example, a candidate side uplink resource with a CBR value lower than a threshold value as a side uplink resource. Alternatively, the recipient terminal orders the CBR values for each of the candidate side uplink resources. When the number of resources of the receiver terminal for transmitting the first information is limited, the receiver terminal may rank CBR values of the plurality of candidate side uplink resources from low to high, and then select the candidate side uplink resource with the low CBR value as the side uplink resource.

For example, the number of resources for transmitting the first information is 2, and the plurality of candidate side link resources includes candidate side link resources 1 to candidate side link resources 3, the CBR value of candidate side link resource 1 is the lowest, and the CBR value of candidate side link resource 2 is greater than the CBR value of candidate side link resource 1 but less than the CBR value of candidate side link resource 3. The receiving terminal may select candidate side-link resource 1-candidate side-link resource 2 as the side-link resource.

In combination with the descriptions of the above cases 1-2-1 and 1-2-2, the first period is a timing duration of a first timer of the receiver terminal, and the first timer is used to maintain an active state of the receiver terminal.

The above embodiments mainly describe a procedure how to perceive the side uplink resource, and the following will exemplarily describe in connection with cases 3-1 to 3-3 how the receiving terminal determines how to stop the perception for the receiving resource pool, so as to avoid that the time domain position of the side uplink resource indicated by the first information is in the sleep period.

In a possible embodiment, if the receiving terminal receives the MAC CE in the active state or in the time of running the timer corresponding to the active state or does not receive the PSCCH scheduling signal before the timer expires, the receiving terminal stops sensing the side uplink resource.

The following describes a procedure in which the receiver terminal stops perceiving the side uplink resource in combination with cases 3-1 to 3-3, respectively.

Case 3-1, in combination with the above case 1-2-1, as shown in fig. 11, during the DRX-incavitytimersl operation of the receiver terminal (T2), the receiver terminal receives sidelink DRX command MAC CE, or neither receives a PSCCH scheduling signal for scheduling transmission until the DRX-incavitytimersl times out, and the receiver terminal will enter a sleep period for DRX cycle 2.

Specifically, the receiver terminal enters into the sleep period for DRX cycle 2 upon receiving sidelink DRX command MAC CE. Or after the DRX-InactivityTimerSL times out, the receiver terminal enters a sleep period for the DRX cycle 2, and keeps the sleep state in the DRX cycle 2.

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

Step 11, in the case that the receiver terminal is in the active period in the DRX cycle 2 as shown in fig. 11, if the receiver terminal receives the PSCCH scheduling signal and demodulates it successfully, the receiver terminal starts a first timer (for example, DRX-incavitytimersl) at time n4, and the receiver terminal will monitor the service data sent by the sender terminal during the operation of DRX-incavitytimersl, which means that the range of the receiver terminal's perceived side uplink resource is extended.

Step 12, during the operation of DRX-incarvitytimersl, the receiving terminal does not receive the PSCCH scheduling signal for continuing to schedule transmission, and when the DRX-incarvitytimersl of the receiving terminal is overtime, the receiving terminal will enter a sleep period for DRX cycle 2, and the receiving terminal should stop sensing the side uplink resource when the DRX-incarvitytimersl of the receiving terminal is overtime.

Specifically, the MAC layer of the receiver terminal notifies the PHY to stop the sending of the auxiliary information, or the PHY determines that the service data of the sender terminal corresponding to the drx-incarvitytimersl is not received during the operation of the drx-incarvitytimersl, after the drx-incarvitytimersl times out, the PHY automatically stops the sending of the side uplink resource indicated by the first information, while the MAC layer defaults to stop the sending of the side uplink resource indicated by the first information.

Step 13, during the operation of DRX-InactigityTimerSL, the receiver terminal receives sidelink DRX command MAC CE, and the receiver terminal enters the sleep period for DRX cycle 2, and if sidelink DRX command MAC CE is received, the receiver terminal should stop perceiving the side uplink resources. Wherein sidelink drx command MAC CE is a MAC layer command that can put the receiver terminal into a sleep state.

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

As a specific implementation: the MAC layer of the receiving terminal notifies the PHY layer to stop the sending for the auxiliary information, or the PHY judges that the sidelink drx command MAC CE is received during the running period of the drx-incaactyitytimersl, the PHY automatically stops the sending for the side uplink resource indicated by the first information, while the MAC defaults to stop the sending for the side uplink resource indicated by the first information.

Case 3-2, in combination with the above case 1-2-2, during the DRX-retransmission timer sl operation of the receiver terminal, the receiver terminal receives sidelink DRX command MAC CE, or neither receives the PSCCH scheduling signal for scheduling transmission until the DRX-retransmission timer sl times out, and the receiver terminal will enter the sleep period for the current DRX cycle.

Case 3-2 will now be described in detail in connection with steps 31 to 32, or alternatively, steps 31 and 33.

Step 31, assuming that the receiver terminal is currently located in the active period of the DRX cycle 2, the receiver terminal receives the PSCCH scheduling signal but does not demodulate the PSCCH scheduling signal successfully, the receiver terminal simultaneously starts the DRX-incaactyitytimersl and the DRX-HARQ-RTT-TimerSL, i.e. the receiver terminal will monitor the service data sent by the sender terminal during the operation of the DRX-incaactyitytimersl, and starts the DRX-retransmission TimerSL when the DRX-HARQ-RTT-TimerSL times out.

Step 32, when the DRX-incapacity timer sl is timed out and the DRX-retransmission timer sl is running, the receiver terminal does not receive the PSCCH scheduling signal for continuing to schedule transmission, and when the DRX-retransmission timer sl is timed out, the receiver terminal enters the sleep period for the DRX cycle 2, and when the DRX-retransmission timer sl is timed out, the receiver terminal stops sensing the side uplink resources.

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

Step 33, during DRX-retransmission timer sl running, the receiver terminal receives sidelink DRX command MAC CE, and the receiver terminal enters the sleep period for DRX cycle 2. In the case that the receiver terminal receives sidelink drx command MAC CE, the receiver terminal stops the serving of the side uplink resources described in case 1-2-2.

As a specific implementation: the MAC layer of the receiving terminal notifies the PHY to stop the sending of the side uplink resource indicated by the first information, or when the PHY determines that sidelink drx command MAC CE is received during the drx-retransmission timer sl operation period, the PHY automatically stops the sending of the first information, while the MAC stops the sending of the first information by default.

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

In the case where the receiver terminal may select the side uplink resource from the resource pool, the receiver terminal may provide the sender terminal with first information to indicate to the sender terminal the side uplink resource that the receiver terminal is able to receive the data. However, since the receiver terminal adopts the DRX mechanism, in order to avoid that the side uplink resource recommended by the receiver terminal to the sender terminal by using the first information for transmitting data is located in the sleep period of the receiver terminal, but not in the active period of the receiver terminal, the receiver terminal should stop the sending of the current DRX cycle when the receiver terminal is about to enter the sleep period, so as to avoid providing the information of the side uplink resource located in the sleep period of the receiver terminal, thereby achieving the purpose of saving power for the receiver terminal.

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

The embodiment of the application can be used for dividing the functional units according to the method for the first terminal, for example, each functional unit can be divided corresponding to each function, and two or more functions can be integrated in one processing unit. The integrated units may be implemented in hardware or in software functional units. It should be noted that, in the embodiment of the present application, the division of the units is schematic, which is merely a logic function division, and other division manners may be implemented in actual practice.

The method according to the embodiment of the present application is described above with reference to fig. 6 to 11, and the communication device for executing the method according to the embodiment of the present application is described below. It will be appreciated by those skilled in the art that the methods and apparatuses may be combined and referred to each other, and that the communication apparatus provided in the embodiments of the present application may perform the steps performed by the terminal or the network device in the above analysis method.

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

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

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

The communication module 1213 is for performing the transmission actions performed by the first terminal in step 603 of fig. 6 of the above-described embodiments, for example. A processing module 1212 for supporting the communication device to perform the actions performed by the first terminal in steps 601 to 602 of fig. 6.

The processing module 1212 may be a processor or controller, such as a central processing unit, a general purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, a transistor logic device, a hardware component, or any combination thereof. Which may implement or perform the various exemplary logic blocks, modules and circuits described in connection with this disclosure. A processor may also be a combination that performs a computational function, such as a combination comprising one or more microprocessors, a combination of a digital signal processor and a microprocessor, and so forth. The communication module may be a transceiver, a transceiver circuit, a communication interface, or the like. The memory module may be a memory.

When the processing module 1212 is the processor 21 or the processor 25, and the communication module 1213 is the transceiver 23, and the storage module 1211 is the memory 22, the communication apparatus according to the present application may be the communication device shown in fig. 2.

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

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

In some implementations, the memory 1340 stores elements, execution modules or data structures, or a subset thereof, or an extended set thereof.

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

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

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

Memory 1340 may include read only memory and random access memory, and provides instructions and data to processor 1310. A portion of the memory 1340 may also include NVRAM. Such as an application memory 1340, a communication interface 1330, and memory 1340, are coupled together by bus system 1320, where bus system 1320 may include a power bus, control bus, status signal bus, and the like, in addition to a data bus. The various buses are labeled as bus system 1320 in fig. 13 for clarity of illustration.

The method disclosed in the above embodiments of the present application may be applied to the processor 1310 or implemented by the processor 1310. Processor 1310 may be an integrated circuit chip with signal processing capabilities. In implementation, the steps of the methods described above may be performed by integrated logic circuitry in hardware or instructions in software in processor 1310. The processor 1310 may be a general purpose processor, a digital signal processor (digital signal processing, DSP), an ASIC, an off-the-shelf programmable gate array (field-programmable gate array, FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware components. The disclosed methods, steps, and logic blocks in the embodiments of the present application may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in connection with the embodiments of the present application may be embodied directly in the execution of a hardware decoding processor, or in the execution of a combination of hardware and software modules in a decoding processor. The software modules may be located in a random access memory, flash memory, read only memory, programmable read only memory, or electrically erasable programmable memory, registers, etc. as well known in the art. The storage medium is located in the memory 1340, and the processor 1310 reads information from the memory 1340 and performs the steps of the method in combination with hardware.

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

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

In one aspect, a computer readable storage medium is provided having instructions stored therein that, when executed, perform the functions as performed by the first terminal in fig. 6 and 7.

In one aspect, a computer program product is provided comprising instructions that when executed perform the functions as performed by the first terminal in fig. 6 and 7.

In one aspect, a chip for use in a first terminal is provided, the chip including at least one processor and a communication interface coupled to the at least one processor, the processor for executing instructions to perform functions as performed by the first terminal in fig. 6.

An embodiment of the present application provides a communication system including: a first terminal and a second terminal. Wherein the first terminal is configured to perform the functions as performed by the first terminal in fig. 6 and 7, and the second terminal is configured to perform the functions as performed by the second terminal in fig. 6 and 7.

In the above embodiments, it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer programs or instructions. When the computer program or instructions are loaded and executed on a computer, the processes or functions described in the embodiments of the present application are performed in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, a network device, a user device, or other programmable apparatus. The computer program or instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another computer readable storage medium, for example, the computer program or instructions may be transmitted from one website site, computer, server, or data center to another website site, computer, server, or data center by 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, data center, etc. that integrates one or more available media. The usable medium may be a magnetic medium, e.g., floppy disk, hard disk, tape; optical media, such as digital video discs (digital video disc, DVD); but also semiconductor media such as solid state disks (solid state drive, SSD).

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

Although the application has been described in connection with specific features and embodiments thereof, it will be apparent that various modifications and combinations can be made without departing from the spirit and scope of the application. Accordingly, the specification and drawings are merely exemplary illustrations of the present application as defined in the appended claims and are considered to cover any and all modifications, variations, combinations, or equivalents that fall within the scope of the application. It will be apparent to those skilled in the art that various modifications and variations can be made to the present application without departing from the spirit or scope of the application. Thus, it is intended that the present application also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.

Claims

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

sensing side uplink resources;

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

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

2. The method of claim 1, wherein the first terminal comprises a medium access control, MAC, layer and a physical layer, PHY, the perceived side uplink resource comprising:

the MAC layer sending a perception indication to the PHY, the perception indication being for informing the PHY to perceive the side-link resources, and information for indicating a first period of time;

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

The PHY determines information of the candidate side link resources located in the first period from the perceived side link resources, and the PHY reports the information of the candidate side link resources to the MAC layer.

3. The method of claim 2, wherein the first terminal employs a discontinuous reception, DRX, mechanism, the DRX mechanism comprising an active period and a sleep period,

the MAC layer transmitting a perception indication and information indicating a first period of time to the PHY, comprising:

the MAC layer sends a perception indication and information for indicating a first period of time to the PHY at a first time, where the first time is located in the sleep period and the first time is located before the first period of time, and the first period of time is located in the active period.

4. A method according to claim 3, wherein said sending the first information to the second terminal comprises:

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

5. The method of claim 2, wherein the first terminal employs a discontinuous reception, DRX, mechanism, the DRX mechanism comprising an active period and a sleep period,

the MAC layer sends 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 activated state at the first moment;

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

6. The method of claim 5, wherein the method further comprises:

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

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

7. The method of claim 5, wherein the method further comprises:

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

8. The method of claim 7, wherein the method further comprises:

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

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

when the first terminal is in the activated state, if a side uplink discontinuous reception command media access control element (MAC CE) is received, the sensing of the side uplink resource is stopped; or,

the first terminal does not receive a PSCCH scheduling signal for scheduling traffic data during an active period or before a first timer expires, and ceases to sense the sidelink resources.

10. The method of claim 8, wherein the method further comprises:

when a third timer expires and the first timer runs, the PSCCH scheduling signal for continuously scheduling the service data is not received, and when the first timer expires, sensing of the side uplink resource is stopped; or, during the operation of the first timer, when receiving a side-link discontinuous reception command MAC CE, stopping sensing the side-link resource.

11. The method of claim 9, wherein the first terminal comprises a medium access control, MAC, layer and a physical layer, PHY, and wherein the ceasing to perceive the side uplink resource comprises: the MAC layer sends a stopping perception instruction to the PHY, and the PHY stops perceiving the side uplink resource according to the stopping perception instruction; alternatively, the PHY automatically stops perceiving the side-link resources.

12. The method of any one of claims 5 to 8, wherein the first terminal sends the first information to the second terminal, including:

the first terminal sends first information to a second terminal before the first timer expires and before the side uplink resource fails.

13. The method according to any of claims 1-8, wherein the quality of the sidelink resources is greater than or equal to a preset threshold, or wherein the sidelink resources are determined by a channel busy rate CBR of the candidate sidelink resources, and/or wherein the sidelink resources are determined by a number of resources transmitting the first information.

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

15. A chip comprising a processor coupled to a communication interface for running a computer program or instructions to implement the method of any one of claims 1 to 13, the communication interface being for communicating with other modules outside the chip.

16. A terminal, comprising: at least one processor coupled to the memory, the at least one processor configured to execute instructions stored in the memory to perform the method of any one of claims 1-13.