WO2021259256A1 - 一种通信方法及装置 - Google Patents

一种通信方法及装置 Download PDF

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Publication number
WO2021259256A1
WO2021259256A1 PCT/CN2021/101524 CN2021101524W WO2021259256A1 WO 2021259256 A1 WO2021259256 A1 WO 2021259256A1 CN 2021101524 W CN2021101524 W CN 2021101524W WO 2021259256 A1 WO2021259256 A1 WO 2021259256A1
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WIPO (PCT)
Prior art keywords
sci
resource
terminal device
indication information
information
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PCT/CN2021/101524
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English (en)
French (fr)
Inventor
张莉莉
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华为技术有限公司
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Publication of WO2021259256A1 publication Critical patent/WO2021259256A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H04W72/542—Allocation or scheduling criteria for wireless resources based on quality criteria using measured or perceived quality
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0446—Resources in time domain, e.g. slots or frames

Definitions

  • This application relates to the field of communication technology, and in particular to a communication method and device.
  • side resources are resources used for communication between devices. There are two methods for selecting side-line resources. One is mode one (mode1), where the base station allocates side-line resources for the side links, and the other is mode two (mode2), where the terminal device on the sending side obtains the resources from the resource pool. Available resources are detected in the resource pool. The available resources can be resources with little or no interference in the resource pool. The terminal device on the sending side determines the sidelink control information (SCI) based on the detected available resources. , Send the SCI to the terminal device on the receiving side for resource reservation.
  • mode1 mode one
  • mode2 mode two
  • SCI sidelink control information
  • the terminal device on the sending side detects a certain resource
  • the distance between the terminal device on the sending side and a certain terminal device (which can be called a third-party terminal device) is relatively long.
  • the third-party terminal device may be a hidden node, and the terminal device on the sending side does not detect that the resource is occupied by the third-party terminal device, and determines the resource as an available resource.
  • the accuracy rate of the available resources detected by the terminal device on the sending side is low.
  • the present application provides a communication method and device, which help to improve the accuracy of detected available resources.
  • the present application provides a communication method that can be executed by a first terminal device.
  • the method includes: the first terminal device sends index information to a second terminal device, where the index information is used to indicate resource selection parameters, and The resource selection parameter is used to select a side row resource for the first terminal device; the first terminal device receives resource indication information from the second terminal device, and the resource indication information is used to indicate the side row resource .
  • the second terminal device assists the first terminal device to detect resources from the resource pool, avoiding hidden terminal problems (HTP), and helping to improve the accuracy of detected available resources. Further, the first terminal device sends index information to the second terminal device, and the second terminal device selects the side resource from the resource pool according to the resource selection parameter indicated by the index information, and minimizes the difference between the first terminal device and the second terminal device. Signaling overhead between.
  • HTTP hidden terminal problems
  • the resource selection parameter includes at least one of the following: resource reservation period, priority, initial threshold, number of threshold elevation, maximum threshold, resource detection related time length, data volume, packet delay Budget.
  • the second terminal device determines the resource selection parameter based on the index information, which helps the second terminal device to detect the side resource that meets the requirements of the first terminal device in the resource pool.
  • the index information is used to indicate the resource selection parameters.
  • the resource selection parameters may include one or more parameters, which helps to reduce the signaling overhead for notifying the resource selection parameters.
  • the index information is carried in a first SCI, and the first SCI is a first-level SCI sent by the first terminal device to the second terminal device; or, the index Information is carried in a second SCI, the second SCI is a second level SCI sent by the first terminal device to the second terminal device, and the second SCI is indicated by the first SCI.
  • the first terminal device carries the index information in the first SCI (first-level SCI), and can effectively transmit the index to the second terminal device in the case that there is no second-level SCI but only the first-level SCI
  • the information instructs the second terminal device to assist the first terminal device in detecting resources in the resource pool based on the resource selection parameter corresponding to the index information.
  • the first terminal device carries the index information in the second SCI (second-level SCI). Since the second-level SCI is carried on the physical sidelink share channel (PSSCH), it helps to reduce the load Require.
  • PSSCH physical sidelink share channel
  • the first SCI further includes first indication information
  • the first indication information is used to indicate that the index information is included in the first SCI, or indicate that the index information is included in the second SCI. Including the index information.
  • the second terminal device can determine the first indication information from the first SCI, and determine whether there is index information in the first SCI or the second SCI based on the first indication information. , You can quickly obtain index information from the first SCI or the second SCI.
  • the first indication information is carried in reserved bits in the first SCI.
  • the first indication information is carried in the reserved bits in the first SCI, and the remaining fields of the first SCI can be minimized.
  • the format field in the first SCI indicates the first format of the second SCI
  • reserved bits in the second SCI carry the index information
  • the reserved bits in the second SCI carry the index information and the identification of the second terminal device; and/or, in the first SCI
  • the second SCI is composed of the index information, the identifier of the first terminal device, and the identifier of the second terminal device.
  • the second terminal device after receiving the first SCI, can determine the format adopted by the second SCI according to the format field of the first SCI, and then determine whether there is index information in the second SCI, and the index information is carried in Which bits in the second SCI, so that the second terminal device can quickly obtain index information.
  • the source identification (identification of the first terminal device) contained in the second SCI can contain more bits, which can more accurately identify the source terminal of the communication, and thus can more accurately identify the source of the communication during feedback.
  • the destination identifier (identity of the second terminal device) included in the second SCI can include more bits, which can more accurately identify the destination terminal of the communication.
  • the method further includes: the first terminal device determining configuration information, and the configuration information includes the corresponding relationship between the index information and the resource selection parameter.
  • the first terminal device receives configuration information from the network device; the configuration information includes M1 correspondences, and each correspondence is a combination of an index and one or a set of resource selection parameters.
  • M1 is greater than or equal to 2.
  • the resource selection parameter may be one or a combination of the following parameters: resource reservation period, priority, initial threshold, threshold increase times, maximum threshold, resource detection related time length, data volume, and packet delay budget.
  • the configuration information further includes a resource pool identifier, and the corresponding relationship between the index information and the resource selection parameter is associated with the resource pool corresponding to the resource pool identifier.
  • the network device determines the configuration information based on each resource pool, which is pertinent.
  • the resource indication information is carried in a third SCI, and the third SCI is the first-level SCI received by the first terminal device from the second terminal device; or, the The resource indication information is carried in a fourth SCI, the fourth SCI is a second-level SCI received by the first terminal device from the second terminal device, and the fourth SCI is indicated by the third SCI.
  • the second terminal device carries the resource indication information in the third SCI (first-level SCI), which can effectively transmit to the first terminal device when there is no second-level SCI but only the first-level SCI
  • the resource indication information instructs the first terminal device to select a side resource based on the resource indication information.
  • the first terminal device carries the resource indication information in the fourth SCI (second level SCI). Since the second level SCI is carried on the PSSCH, it helps to reduce the load requirement.
  • the third SCI further includes second indication information
  • the second indication information is used to indicate that the third SCI includes the resource indication information, or indicate that the fourth SCI Includes the resource indication information.
  • the first terminal device may determine the second indication information from the third SCI, and determine whether there is resource indication information in the third SCI or the fourth SCI based on the second indication information, If yes, obtain resource indication information from the third SCI or the fourth SCI.
  • the second indication information is carried in reserved bits in the third SCI.
  • the second indication information is carried in the reserved bits in the third SCI, and the remaining fields of the third SCI can be minimized.
  • the resource indication information is carried in a field used for resource allocation in the third SCI.
  • the first terminal device can quickly obtain the resource indication information from the field used for resource allocation in the third SCI.
  • the method further includes: the first terminal device sends sideline information through the sideline resource.
  • the present application provides a communication method that can be executed by a second terminal device.
  • the method includes: the second terminal device receives index information from the first terminal device; and the second terminal device according to the index information
  • the indicated resource selection parameter is to select a side row resource; the second terminal device sends resource indication information to the first terminal device, and the resource indication information is used to indicate the side row resource.
  • the second terminal device assists the first terminal device to detect resources from the resource pool, avoiding the problem of hidden nodes, and helping to improve the accuracy of the detected available resources. Further, the first terminal device sends index information to the second terminal device, and the second terminal device selects the side resource from the resource pool according to the resource selection parameter indicated by the index information, and minimizes the difference between the first terminal device and the second terminal device. Signaling overhead between.
  • the sideline resource is used for the first terminal device to send sideline information.
  • the resource selection parameter includes at least one of the following: resource reservation period, priority, initial threshold, number of threshold elevation, maximum threshold, resource detection related time length, data volume, packet delay Budget.
  • the second terminal device determines the resource selection parameter based on the index information, which helps the second terminal device to detect the side resource that meets the requirements of the first terminal device in the resource pool.
  • the index information is used to indicate the resource selection parameter.
  • the resource selection parameter may include one or more parameters, which helps to reduce the signaling overhead for notifying the resource selection parameter.
  • the index information is carried in a first SCI, and the first SCI is a first-level SCI received by the second terminal device from the first terminal device; or, the index Information is carried in a second SCI, the second SCI being a second level SCI received by the second terminal device from the first terminal device, and the second SCI is indicated by the first SCI.
  • the first terminal device carries the index information in the first SCI (first-level SCI), and can effectively transmit the index to the second terminal device in the case that there is no second-level SCI but only the first-level SCI
  • the information instructs the second terminal device to assist the first terminal device in detecting resources in the resource pool based on the resource selection parameter corresponding to the index information.
  • the first terminal device carries the index information in the second SCI (second level SCI). Since the second level SCI is carried on the PSSCH, it helps to reduce the load requirement.
  • the first SCI further includes first indication information
  • the first indication information is used to indicate that the index information is included in the first SCI, or indicate that the index information is included in the second SCI. Including the index information.
  • the second terminal device can determine the first indication information from the first SCI, and determine whether there is index information in the first SCI or the second SCI based on the first indication information. , You can quickly obtain index information from the first SCI or the second SCI.
  • the first indication information is carried in reserved bits in the first SCI.
  • the first indication information is carried in the reserved bits in the first SCI, and the remaining fields of the first SCI can be minimized.
  • the format field in the first SCI indicates the first format of the second SCI
  • reserved bits in the second SCI carry the index information
  • the reserved bits in the second SCI carry the index information and the identification of the second terminal device; and/or, in the first SCI
  • the second SCI is composed of the index information, the identifier of the first terminal device, and the identifier of the second terminal device.
  • the second terminal device after receiving the first SCI, can determine the format adopted by the second SCI according to the format field of the first SCI, and then determine whether there is index information in the second SCI, and the index information is carried in Which bits in the second SCI, so that the second terminal device can quickly obtain index information.
  • the source identification (identification of the first terminal device) contained in the second SCI can contain more bits, which can more accurately identify the source terminal of the communication, and thus can more accurately identify the source of the communication during feedback.
  • the destination identifier (identity of the second terminal device) included in the second SCI can include more bits, which can more accurately identify the destination terminal of the communication.
  • the method further includes: the second terminal device determining configuration information; the configuration information includes the corresponding relationship between the index information and the resource selection parameter.
  • the first terminal device receives configuration information from the network device; the configuration information includes M1 correspondences, and each correspondence is a combination of an index and one or a set of resource selection parameters.
  • M1 is greater than or equal to 2.
  • the resource selection parameter can be one or a combination of the following parameters: resource reservation period, priority, initial threshold, threshold increase times, resource detection related duration, maximum threshold, data volume, and packet delay budget.
  • the configuration information includes a resource pool identifier, and the corresponding relationship between the index information and the resource selection parameter is associated with a resource pool corresponding to the resource pool identifier.
  • the network device determines the configuration information based on each resource pool, which is pertinent.
  • the resource indication information is carried in a third SCI, and the third SCI is a first-level SCI sent by the second terminal device to the first terminal device; or, the The resource indication information is carried in a fourth SCI, the fourth SCI is a second-level SCI sent by the second terminal device to the first terminal device, and the fourth SCI is indicated by the third SCI.
  • the second terminal device carries the resource indication information in the third SCI (first-level SCI), which can effectively transmit to the first terminal device when there is no second-level SCI but only the first-level SCI
  • the resource indication information instructs the first terminal device to select a side resource based on the resource indication information.
  • the first terminal device carries the resource indication information in the fourth SCI (second-level SCI). Since the second-level SCI is located in the PSSCH, it helps to reduce the load requirement.
  • the third SCI further includes second indication information
  • the second indication information is used to indicate that the third SCI includes the resource indication information, or indicate that the fourth SCI Includes the resource indication information.
  • the first terminal device may determine the second indication information from the third SCI, and determine whether there is resource indication information in the third SCI or the fourth SCI based on the second indication information, If yes, obtain resource indication information from the third SCI or the fourth SCI.
  • the second indication information is carried in reserved bits in the third SCI.
  • the second indication information is carried in the reserved bits in the third SCI, and the remaining fields of the third SCI can be minimized.
  • the resource indication information is carried in a field used for resource allocation in the third SCI.
  • the first terminal device can quickly obtain the resource indication information from the field used for resource allocation in the third SCI.
  • the present application provides a communication method that can be executed by a second terminal device.
  • the method includes: the second terminal device determines at least one resource set, and the at least one resource set is used for the first terminal device to select Side row resources; the second terminal device sends resource indication information to the first terminal device, where the resource indication information is used to indicate the at least one resource set.
  • the second terminal device actively assists the first terminal device to detect at least one resource set from the resource pool, avoiding the problem of hidden nodes, and helping to improve the accuracy of the detected available resources. Further, the first terminal device does not need to send resource selection parameters to the second terminal device, which minimizes the signaling overhead between the first terminal device and the second terminal device.
  • the method further includes: the second terminal device receives enabling information from a network device; the enabling information is used to enable the second terminal device to be the first The terminal device determines the at least one resource set.
  • the at least one resource set includes N side row resources; or, the at least one resource set includes periodic N side row resources, and N is a positive integer.
  • the second terminal device before the second terminal device determines at least one resource set, it further includes: the second terminal device determines that a channel busy ratio (CBR) is less than or equal to a CBR threshold.
  • CBR channel busy ratio
  • the use of resources in the resource pool is judged by CBR to avoid signaling interaction caused by the second terminal device assisting the first terminal device to detect resources in the case of resource congestion, which further affects communication performance.
  • the resource indication information is further used to indicate the priority and/or threshold associated with the at least one resource set, and the priority associated with the resource set is a reference priority used to determine the resource set. Level, the threshold associated with the resource set is a reference threshold for determining the resource set.
  • the resource indication information is also used to indicate the priority and/or threshold associated with at least one resource set, which helps the first terminal device to select a side resource from the at least one resource set.
  • the priority and/or threshold associated with the at least one resource set is configured through signaling; the signaling is a radio resource control (radio resource control, RRC) signal from a network device. Command or medium access control (MAC) signaling, or PC5RRC signaling from the first terminal device.
  • RRC radio resource control
  • MAC medium access control
  • the resource indication information is further used to indicate the use priority associated with the at least one resource set; the use priority associated with the at least one resource set is used to indicate the first terminal device The order in which the at least one resource set is used in order to select the side row resources.
  • the resource indication information is also used to indicate the use priority associated with at least one resource set, and the first terminal device may select the side row resources from each resource set in order of use priority, from high to low.
  • the resource indication information includes index information of the at least one resource set, and the index information is used to indicate a resource reservation period of the corresponding resource set.
  • the method further includes: the second terminal device determining configuration information; the configuration information includes the corresponding relationship between the index information and the resource reservation period.
  • the second terminal device receives configuration information from the network device; the configuration information includes a one-to-one correspondence between M2 index information and M2 resource reservation periods, and M2 is greater than or equal to 2.
  • the configuration information further includes a resource pool identifier, and the corresponding relationship between the index information and the resource reservation period is associated with the resource pool corresponding to the resource pool identifier.
  • the network device determines the configuration information based on each resource pool, which is pertinent.
  • the present application provides a communication method that can be executed by a first terminal device.
  • the method includes: the first terminal device receives resource indication information from a second terminal device; the resource indication information is used to indicate at least one Resource collection; the first terminal device selects a side row resource from the at least one resource collection according to the resource indication information.
  • the second terminal device actively assists the first terminal device to detect at least one resource set from the resource pool, avoiding the problem of hidden nodes, and helping to improve the accuracy of detecting available resources. Further, the first terminal device does not need to send resource selection parameters to the second terminal device, which minimizes the signaling overhead between the first terminal device and the second terminal device.
  • the at least one resource set includes N side row resources; or, the at least one resource set includes periodic N side row resources, and N is a positive integer.
  • the resource indication information is further used to indicate the priority and/or threshold associated with the at least one resource set, and the priority associated with the resource set is a reference priority used to determine the resource set. Level, the threshold associated with the resource set is a reference threshold for determining the resource set.
  • the resource indication information is also used to indicate the priority and/or threshold associated with at least one resource set, which helps the first terminal device to select a side resource from the at least one resource set.
  • the priority associated with the first terminal device is higher than the priority associated with the resource set to which the side row resource belongs, and/or the threshold associated with the first terminal device is higher than the associated priority.
  • the first terminal device selects a side resource from at least one resource set according to the priority and/or threshold associated with itself and the priority and/or threshold associated with at least one resource set.
  • the method further includes: the first terminal device sends PC5RRC signaling to the second terminal device; the PC5RRC signaling includes the priority associated with the first terminal device And/or threshold.
  • the resource indication information is further used to indicate the use priority associated with the at least one resource set; the use priority associated with the at least one resource set is used to indicate the first terminal device The order in which the at least one resource set is used in order to select the side row resources.
  • the resource indication information is also used to indicate the use priority associated with at least one resource set, and the first terminal device may select the side row resources from each resource set in order of use priority, from high to low.
  • the resource indication information includes index information of the at least one resource set, and the index information is used to indicate a resource reservation period of the corresponding resource set.
  • the method further includes: the first terminal device determines configuration information; and the configuration information includes a correspondence between index information and a resource reservation period.
  • the first terminal device receives configuration information from the network device; the configuration information includes a one-to-one correspondence between M2 index information and M2 resource reservation periods, and M2 is greater than or equal to 2.
  • the configuration information further includes a resource pool identifier, and the corresponding relationship between the index information and the resource reservation period is associated with the resource pool corresponding to the resource pool identifier.
  • the network device determines the configuration information based on each resource pool, which is pertinent.
  • the method further includes: sending the side row information through the side row resource.
  • an embodiment of the present application provides a communication device.
  • the device may be a terminal device or a chip for the terminal device.
  • the device has the function of realizing each implementation method in any aspect of the first aspect to the fourth aspect. This function can be realized by hardware, or by hardware executing corresponding software.
  • the hardware or software includes one or more modules corresponding to the above-mentioned functions.
  • an embodiment of the present application provides a communication device including a processor and a memory; the memory is used to store computer-executable instructions, and when the device is running, the processor executes the computer-executable instructions stored in the memory to enable The device executes each implementation method in any aspect of the above-mentioned first aspect to the fourth aspect.
  • an embodiment of the present application provides a communication device, including a processor and a communication interface, where the communication interface is used to receive signals from other communication devices other than the communication device and transmit them to the processor or The signal from the processor is sent to another communication device other than the communication device, and the processor is used to implement each implementation method of any aspect of the first aspect to the fourth aspect through a logic circuit or an execution code instruction.
  • an embodiment of the present application provides a communication device, including a unit or means for executing each step in each implementation method in any aspect of the first aspect to the fourth aspect.
  • an embodiment of the present application provides a communication device, including a processor, configured to be connected to a memory, and configured to call a program stored in the memory to execute each of the foregoing aspects of the first aspect to the fourth aspect.
  • the memory can be located inside the device or outside the device.
  • the processor includes one or more.
  • an embodiment of the present application also provides a computer-readable storage medium that stores instructions in the computer-readable storage medium, which when run on a computer, causes the computer to execute any of the first to fourth aspects above.
  • the embodiments of the present application also provide a computer program product, the computer product including a computer program, when the computer program runs, the implementation method of any aspect of the first aspect to the fourth aspect is executed.
  • an embodiment of the present application further provides a chip system, including a processor, configured to execute each implementation method in any aspect of the first aspect to the fourth aspect.
  • an embodiment of the present application further provides a communication system, which includes the first terminal device of the foregoing first aspect and the second terminal device of the foregoing second aspect, or the second terminal device of the foregoing third aspect and the foregoing first terminal device.
  • the first terminal equipment in four aspects.
  • FIG. 1 is a schematic diagram of a wireless communication system network architecture provided by this application.
  • Figure 2 is a correspondence between PPPP and threshold provided by this application;
  • Figure 3 is a schematic diagram of reserving side row resources provided by this application.
  • FIG. 4 is a schematic diagram of another wireless communication system provided by this application.
  • FIG. 5 is a schematic diagram of resource detection and selection provided by this application.
  • FIG. 6 is a schematic flowchart of a communication method provided by this application.
  • FIG. 7 is a schematic diagram of a corresponding relationship between index information and resource selection parameters provided by this application.
  • FIG. 8 is a schematic flowchart of another communication method provided by this application.
  • FIG. 9 is a schematic diagram of a corresponding relationship between index information and resource reservation period provided by this application.
  • FIG. 10 is a schematic structural diagram of a communication device provided by this application.
  • FIG. 11 is a schematic structural diagram of another communication device provided by this application.
  • a terminal device is a device that provides users with voice and/or data connectivity.
  • it may include a handheld device with a wireless connection function or a processing device connected to a wireless modem.
  • the device can communicate with the core network via a radio access network (RAN), and exchange voice and/or data with the RAN.
  • the equipment may include user equipment (UE), wireless terminal equipment, mobile terminal equipment, subscriber unit (subscriber unit), subscriber station (subscriber station), mobile station (mobile station), mobile station (mobile), remote station (remote station), access point (access point, AP), remote terminal equipment (remote terminal), access terminal equipment (access terminal), user terminal equipment (user terminal), user agent (user agent), or user equipment (user device) and so on.
  • it may include mobile phones (or “cellular” phones), computers with mobile terminal equipment, portable, pocket-sized, handheld, computer-built mobile devices, smart wearable devices, and so on.
  • PCS personal communication service
  • SIP session initiation protocol
  • WLL wireless local loop
  • PDA personal digital assistant
  • restricted devices such as devices with low power consumption, or devices with limited storage capabilities, or devices with limited computing capabilities. Examples include barcodes, radio frequency identification (RFID), sensors, global positioning system (GPS), laser scanners and other information sensing equipment.
  • RFID radio frequency identification
  • GPS global positioning system
  • laser scanners and other information sensing equipment.
  • Network equipment includes access network (access network, AN) equipment, such as a base station (for example, an access point), which may refer to equipment that communicates with wireless terminal equipment through one or more cells over an air interface in an access network.
  • AN access network
  • the base station can be used to convert received air frames and Internet Protocol (IP) packets to each other, as a router between the terminal device and the rest of the access network, where the rest of the access network can include an IP network.
  • IP Internet Protocol
  • the network equipment can also coordinate the attribute management of the air interface.
  • the network equipment may include an evolved base station (NodeB or eNB or e-NodeB, evolutional Node B) in a long term evolution (LTE) system or an evolved LTE system (LTE-Advanced, LTE-A), or It can also include the next generation node B (gNB) in the 5G NR system, or it can also include the centralized unit (CU) and distributed unit in the cloud radio access network (CloudRAN) system.
  • a distributed unit (DU) is not limited in the embodiment of the present application.
  • Sideline resources may also be referred to as sideline link resources, or resources, or transmission resources.
  • the side link may also be referred to as a side link, or a side link, or a PC5 interface link, or a link between terminal devices.
  • side resources are resources used for communication between terminal devices and terminal devices.
  • the side resources may include side resources in the frequency domain and side resources in the time domain.
  • This application mainly discusses side resources in the time domain. In the case of non-specific conditions, the subsequent side resources can all refer to the side resources in the time domain, and a unified description is given here.
  • side-line resources may include side-line link transmission resources and side-line link reception resources.
  • the side link transmission resource is used to send information, such as sending control information and/or data.
  • the side link receiving resource is used to receive information, such as receiving control information and/or data.
  • the two-level SCI includes the first-level SCI and the second-level SCI.
  • the first-level SCI is carried in the physical sidelink control channel (PSCCH), and the second-level SCI is carried in the PSSCH.
  • the level SCI is related to the second level SCI, in other words, the first level SCI indicates the second level SCI.
  • the fields in the first level of SCI include priority, frequency resource assignment, time resource assignment, resource reservation period, and demodulation reference signal.
  • signal DMRS
  • second-stage SCI format (2 nd -stage SCI format)
  • offset indicator (beta_offset indicator)
  • MCS table modulation and coding scheme table
  • reserved field (reserve) Wait.
  • the offset indicates the resource (such as resource element (resource element, RE) occupied by the second-level SCI).
  • the resource occupied by the second-level SCI can be calculated through the offset indicator, such as the number of REs. .
  • the format of the second-level SCI is indicated by the first-level SCI.
  • the fields in the second-level SCI include HARQ process ID (HARQ process ID), new data indicator (NDI), and redundancy version (redundancy version). , RV), source ID (source ID), destination ID (destination ID), CSI request (CSI request), etc.
  • Two-level SCI can also be called two-level SCI.
  • the first level of SCI can also be called the first level of SCI
  • the second level of SCI can also be called the second level of SCI.
  • ...field can also be referred to as "...bit” or “...occupied bit” or “...corresponding bit”.
  • priority field may also be referred to as priority bits, or bits occupied by priority, or bits corresponding to priority.
  • frequency domain resource allocation field may also be referred to as frequency domain resource allocation bits, or bits occupied by frequency domain resource allocation, or bits corresponding to the frequency domain resource allocation field.
  • At least one means one or more, and “plurality” means two or more.
  • “And/or” describes the association relationship of the associated objects, indicating that there can be three relationships, for example, A and/or B, which can mean: A alone exists, A and B exist at the same time, and B exists alone, where A, B can be singular or plural.
  • the character “/” generally indicates that the associated objects before and after are in an “or” relationship.
  • "The following at least one item (a)” or similar expressions refers to any combination of these items, including any combination of a single item (a) or a plurality of items (a). For example, at least one of a, b, or c can mean: a, b, c, ab, ac, bc, or abc, where a, b, and c can be single or multiple .
  • ordinal numbers such as “first” and “second” mentioned in the embodiments of this application are used to distinguish multiple objects, and are not used to limit the order, timing, priority, or order of multiple objects. Importance.
  • the first value and the second value are only for distinguishing different values, but do not indicate the difference in content, priority, or importance of the two values.
  • FIG. 1 is a schematic diagram of a wireless communication system network architecture provided by an embodiment of this application.
  • the wireless communication system includes a network device and multiple terminal devices.
  • the wireless communication system may include a network device, a terminal device 1, and a terminal device 2. Both of these terminal devices may be connected to the network device, or only the terminal device 1 and the terminal device may be connected to the two terminal devices.
  • Network device connection, terminal device 2 is not connected to the network device, the two terminal devices can also communicate through the side link, that is, terminal device 1 is a terminal device with network coverage, and terminal device 2 is part of the network coverage Terminal equipment.
  • Figure 1 takes as an example that only the terminal device 1 is connected to the network device.
  • the number of terminal devices in FIG. 1 is just an example.
  • a network device can provide services for multiple terminal devices.
  • the network device in FIG. 1 is, for example, an access network device, such as a base station.
  • the access network equipment corresponds to different equipment in different systems.
  • the 4th generation mobile communication technology (the 4th generation, 4G) system it can correspond to the eNB
  • the 5G system corresponds to the access network equipment in 5G, for example, gNB.
  • the terminal device in FIG. 1 is a UE as an example, but the terminal device in the embodiment of the present application is not limited to this.
  • the network device When the network device communicates with the terminal device 1, the network device can be used as the sending end and the terminal device 1 can be used as the receiving end; alternatively, the network device can be used as the receiving end and the terminal device 1 can be used as the sending end.
  • the terminal device 1 may send uplink data to the network device through the uplink resource scheduled by the network device, where the uplink resource is scheduled by the network device through the uplink control information.
  • the terminal device 1 may also receive downlink data from the network device through the downlink resource scheduled by the network device, where the downlink resource is scheduled by the network device through downlink control information.
  • the terminal device 1 and the terminal device 2 can communicate side by side.
  • the terminal device 1 can be used as the transmitting end, and the terminal device 2 can be used as the receiving end.
  • the terminal device 2 can be used as the transmitting end, and the terminal device 1 can be used as the receiving end.
  • the terminal device 1 and the terminal device 2 transmit data through sideline resources. There are two ways to select side resources:
  • the first mode is a centralized control method.
  • the central control device (such as a base station or a relay station, etc.) allocates resources to the terminal device on the sending side through scheduling.
  • the second mode is a distributed resource multiplexing method based on competition.
  • the terminal equipment on the sending side obtains available resources from the resource pool through competition.
  • the resource pool is a block of resources divided by the base station.
  • Each terminal equipment In this whole block of resources a small block of resources that is not interfered or interfered to a lesser degree is competed, and the small block of resources can be referred to as an available resource.
  • the terminal device on the sending side determines the SCI based on the detected available resources, and sends the SCI to the terminal device on the receiving side for resource reservation.
  • Fig. 2 is a correspondence between a single packet priority (prose per-packet priority, PPPP) and a threshold (threshold) provided by an embodiment of the application. 2 illustrates that when the terminal device on the sending side competes for resources in the resource pool, it needs to detect the SCI on the resource and interpret the corresponding PPPP and the specific location of the resource, and according to its own PPPP (as shown in Figure 2 on the terminal The PPPP of the device) and the PPPP of other terminal devices on the detected resource (the PPPP of other terminal devices in the row in Figure 2) determine the corresponding threshold (the threshold at the intersection of the row and the column in Figure 2), if The detected resource satisfies the corresponding threshold. For example, if the signal strength value detected on the resource is less than the threshold, the resource is determined to be an available resource; otherwise, the resource is determined to be an unavailable resource.
  • PPPP packet priority
  • threshold threshold
  • the threshold value is determined to be TH36. If the signal strength value of the resource is not higher than TH36, the resource is determined to be an available resource.
  • PPPP is taken as an example.
  • the signal strength value can be understood as reference signal received power (RSRP), received signal strength (RSSI), or signal to interference and noise ratio (SINR).
  • RSRP reference signal received power
  • RSSI received signal strength
  • SINR signal to interference and noise ratio
  • the initial threshold is used to compare signal strength to judge/determine whether the resource is an available resource, and the initial threshold may also be referred to as a threshold.
  • competing resources can also be referred to as detection resources, detection resources, selection resources, sensing resources, or deterministic resources.
  • the terminal device on the sending side can reserve up to N resources (N is a positive integer) each time the SCI is sent, and the resources reserved in the same SCI are used to transmit the same transmission block (transmission block, TB); or, the resources reserved in the same SCI can also be the first resource to the Xth resource for transmitting one transmission block, and the X+1th resource to the Nth resource for transmitting another transmission block , Where X is a positive integer greater than or equal to 1 and less than or equal to N, and so on, without enumerating one by one.
  • N is 3 or any integer greater than 3.
  • the SCI may also carry a resource reservation period, and N resources reserved in one SCI may be repeatedly reserved in the resource reservation period.
  • resources reserved in different resource reservation periods are used to transmit different transmission blocks. For example, N resources in the first resource reservation period are used to transmit transmission block 1, N resources in the second resource reservation period are used to transmit transmission block 2, and N resources in the third resource reservation period Two resources are used to transmit transport block 3, and so on.
  • Figure 3 shows a schematic diagram of reserved side row resources.
  • the side row resources reserved in the first resource reservation period are used to transmit transmission block 1, and in the second resource reservation period, the side row resources are reserved.
  • the remaining side row resources are used to transmit transport block 2. It should be noted that the requirements for all side row resources reserved in each resource reservation period are limited to a time window, that is, the reserved side row resources cannot exceed the time window.
  • the resource reservation period may also be referred to as the reserved resource period, or the reserved period, or the resource period.
  • the transmission block may also be referred to as a data packet (data packet).
  • the terminal device on the sending side detects resources, there may be a hidden node problem.
  • the explanation is that when the terminal device on the sending side detects resources in the resource pool, for a certain resource, because the terminal device on the sending side and a certain resource A terminal device (which may be referred to as a third-party terminal device) is far away, and the terminal device on the sending side may not detect that the resource is being occupied by the third-party terminal device, and determines the resource as an available resource. Based on this, the accuracy rate of the available resources detected by the terminal device on the sending side is low.
  • terminal device A sends data to terminal device B through resource 1.
  • terminal device C detects the resource in the resource pool. Since terminal device C is far away from terminal device A, the terminal Device C does not detect that resource 1 is being occupied by terminal device A, so for terminal device C, terminal device A is a hidden node, and terminal device C uses resource 1 as an available resource. That is, the terminal device C mistakenly determines resource 1 as an available resource.
  • the auxiliary terminal device can be understood as a terminal device on the receiving side or a terminal device near the terminal device on the receiving side.
  • the auxiliary terminal device shares a resource pool with the terminal device on the sending side, and the auxiliary terminal device detects resources in the resource pool, which can avoid the problem of hidden nodes and help improve the accuracy of the detected available resources.
  • terminal device C may select terminal device B or terminal device D as the auxiliary terminal device.
  • terminal device D assists terminal device C in detecting resources, and sends resource indication information of the detected available resources to the terminal Device C, terminal device C determines the available resources in the resource pool according to the resource indication information.
  • the terminal device on the sending side needs to send the resource selection parameters corresponding to the resource detection to the auxiliary terminal device, so that the auxiliary terminal device selects the resource based on the resource selection parameter. Assist the terminal device on the sending side to detect resources in the pool.
  • the resource selection parameter may also be referred to as service characteristic parameter, or service characteristic, or resource characteristic, or characteristic information.
  • Resource selection parameters include priority, initial threshold, number of threshold upgrades, maximum threshold, traffic feature, data volume, resource detection window, resource detection related duration, and packet delay budget (PDB) , At least one or more of the resource reservation period.
  • PDB packet delay budget
  • the priority may be PPPP or quality of service (quality of service, QoS) priority, or any identifier that characterizes the level of data to be transmitted.
  • the threshold may be a threshold related to the signal strength value, for example, an RSRP threshold, an RSSI threshold, or an SINR. Refer to the embodiment shown in FIG. 2 for the implementation of detecting resources based on priority and/threshold.
  • resources can be detected based on priority and initial threshold first. If the ratio of detected available resources is less than or equal to the preset ratio, the threshold can be increased according to the preset offset, and the available resources can be further detected according to the increased threshold. .
  • the number of threshold elevations is the maximum number of times the threshold is raised, which can also be understood as the maximum number of elevations, or the maximum allowable number of threshold elevations, etc.; the maximum threshold is the maximum value of the threshold after the threshold is raised. When resources are detected based on the raised threshold, the raised threshold The maximum threshold cannot be exceeded.
  • the relationship between the initial threshold, the number of threshold elevations, and the maximum threshold is that after the initial threshold is increased by the preset offset for the number of threshold elevations, the resulting elevated threshold is less than or equal to the maximum threshold.
  • the preset offset is a value configured or preset by the network device through RRC signaling.
  • the amount of data may include a buffer status report (BSR) and/or the number of subcarriers (subchannels) required by the resource.
  • BSR buffer status report
  • subcarriers subchannels
  • Data characteristics include data cycles, or whether the data is periodic or aperiodic.
  • the resource detection related duration may include at least one or a combination of at least one of the first duration, the second duration, the third duration, the fourth duration, and the fifth duration.
  • the first duration is the duration required for the terminal device to complete the resource detection and selection process
  • the second duration is the duration required for the terminal device to identify candidate resources and select resources for sidelink transmission
  • the third duration is the terminal The device has a long processing time delay for the feedback information.
  • the fourth duration is the delay time of the resource selection window of the terminal device relative to the resource detection window, or the start time of the resource selection window relative to the end time of the resource detection window.
  • the fifth time length is the time length for the terminal device to complete SCI decoding/analysis, or the time length for the terminal device to complete SCI decoding/analysis and perform RSRP/RSSI measurement.
  • the time required for the terminal device to identify the candidate resource and select the resource for sidelink transmission may be the time required for the terminal device to identify the candidate resource and select the resource set for potential sidelink transmission.
  • the RSRP measurement is the RSRP measurement for the DMRS in the resource detection process.
  • the RSSI measurement is a measurement of the side link energy during the resource detection process.
  • the foregoing first duration may be T3 in FIG. 5
  • the foregoing second duration may be T proc,1 in FIG. 5
  • the foregoing fourth duration may be T1 in FIG. 5
  • the foregoing fifth duration may be T proc,0 in 5 .
  • the above-mentioned parameters are parameters of the auxiliary terminal device, and the auxiliary terminal device obtains these pre-configured parameters, and the auxiliary terminal device performs resource detection and/or resource selection according to these parameters or based on these parameters.
  • acquisition can be understood as confirmation.
  • the pre-configuration can be a value defined by default or sent by the network device to the auxiliary terminal device through RRC signaling.
  • an embodiment of the present application provides a communication method.
  • the method can be executed by two terminal devices.
  • the two terminal devices are, for example, the first terminal device and the second terminal device. Two terminal equipment.
  • the method may also be executed by a communication device capable of supporting the terminal device to implement the functions required by the method, such as a chip system.
  • the first terminal device is terminal device 1, the second terminal device is terminal device 2, and terminal device 2 assists terminal device 1 in detecting resources in the resource pool; or, the first terminal device is terminal device 2.
  • the second terminal device is terminal device 1, and terminal device 1 assists terminal device 2 in detecting resources in the resource pool.
  • the embodiment of the present application provides a communication method. For details, refer to the flowchart shown in FIG. 6.
  • Step 601 The first terminal device sends index information to the second terminal device.
  • the second terminal device receives index information from the first terminal device.
  • the first terminal device and the third terminal device establish a side link connection, the first terminal device serves as the terminal device on the sending side, and the third terminal device serves as the terminal device on the receiving side.
  • the second terminal device can be triggered to assist the first terminal device in detecting resources in the resource pool.
  • the second terminal device may be a third terminal device, or a terminal device near the third terminal device and sharing the resource pool.
  • the first terminal device and the second terminal device also need to establish a side link connection.
  • the second terminal device is located near the third terminal device, and the surrounding interference situation of the second terminal device is similar to the surrounding interference situation of the third terminal device.
  • the second terminal device may be used as an auxiliary terminal device.
  • that the second terminal device satisfies the preset condition may be: the first parameter of the second terminal device is greater than or equal to the first preset value; or, the second parameter of the second terminal device is less than or equal to the second preset value.
  • the first parameter is associated with channel quality
  • the second parameter is associated with feedback information.
  • the channel quality may be the quality of the channel between the first terminal device and the second terminal device.
  • the feedback information may be feedback information in the first multicast group.
  • the second terminal device is included in the first multicast group.
  • Feedback information includes positive confirmation (acknowledgement, ACK) and negative confirmation (not-acknowledgement, NACK).
  • the receiving end feeds back NACK. That is, the receiving end does not feed back ACK, and the receiving end feeds back NACK on the shared feedback resource when the reception is incorrect.
  • the receiving end can either feed back ACK or NACK. That is, when the receiving end receives correctly, it feeds back ACK on the feedback resources of the sending end and the receiving end, and when the receiving end receives incorrectly, it feeds back NACK on the feedback resources of the sending end and the receiving end.
  • the first preset value or the second preset value is configured by the network device or the first terminal device.
  • the first preset value or the second preset value is configured by the network device through RRC signaling.
  • the first preset value or the second preset value is configured by the first terminal device through the SCI. It can be understood that if the first preset value or the second preset value in the RRC signaling or the SCI is the default value, it may indicate that the second terminal device does not need to assist in detecting the available resources.
  • the first preset value or the second preset value may be configured corresponding to the resource pool. That is, if there are multiple resource pools, the network device or the first terminal device can configure corresponding first preset values or second preset values for different resource pools.
  • the first preset value is associated with CBR.
  • the first preset value corresponding to the first CBR is smaller than the first preset value corresponding to the second CBR.
  • the second preset value is associated with CBR.
  • the second preset value corresponding to the first CBR is greater than the second preset value corresponding to the second CBR.
  • first preset value and the second preset value may be the same or different.
  • the first parameter may be any one of the following cases 1 to 4, and the second parameter may be the following case 5 or case 6.
  • the first parameter is the channel state information (CSI) measurement result measured by the first terminal device within the preset time period; or, the first parameter is the channel state information (CSI) measurement result measured by the second terminal device within the preset time period
  • the CSI measurement result where the CSI measurement result measured by the second terminal device is fed back to the first terminal device by the second terminal device.
  • the CSI measurement result is the CSI measurement result between the first terminal device and the second terminal device.
  • the CSI measurement result is used to indicate the channel quality between the first terminal device and the second terminal device.
  • the first CSI measurement result is greater than the second CSI measurement result, and the channel quality indicated by the first CSI measurement result is better than the channel quality indicated by the second CSI measurement result.
  • the first parameter is the RSRP measured by the first terminal device based on the reference signal sent by the second terminal device within the preset time period; or the first parameter is the RSRP measured by the second terminal device based on the first terminal within the preset time period RSRP measured by the reference signal sent by the device.
  • RSRP can reflect the channel quality of the first terminal device and the second terminal device.
  • the first RSRP is greater than the second RSRP, and the channel quality corresponding to the first RSRP is better than the channel quality corresponding to the second RSRP.
  • the first parameter is the RSSI measured by the first terminal device based on the signal sent by the second terminal device within the preset time period; or the first parameter is the RSSI measured by the first terminal device based on the first terminal device within the preset time period The RSSI of the sent signal measurement.
  • the RSSI can reflect the channel quality of the first terminal device and the second terminal device.
  • the first RSSI is greater than the second RSSI, and the channel quality corresponding to the first RSSI is better than the channel quality corresponding to the second RSSI.
  • the first parameter is the reference signal received quality (RSRQ) measured by the first terminal device based on the reference signal sent by the second terminal device within the preset time period; or, the first parameter is the preset time
  • the second terminal device measures the RSRQ based on the reference signal sent by the first terminal device.
  • RSRQ can reflect the channel quality of the first terminal device and the second terminal device.
  • the first RSRQ is greater than the second RSRQ, and the channel quality corresponding to the first RSRQ is better than the channel quality corresponding to the second RSRQ.
  • the second parameter is the percentage of ACK in the feedback information sent by the first terminal device to the second terminal device within the preset time period; or, the second parameter is the percentage of ACK received by the first terminal device within the preset time period The percentage of ACK in the feedback information from the second terminal device.
  • the feedback information may be feedback information sent based on the foregoing second feedback manner.
  • the percentage of ACK may reflect the channel quality between the first terminal device and the second terminal device.
  • the percentage 1 of ACK is greater than the percentage 2 of ACK, and the channel quality corresponding to the percentage 1 of ACK is better than the percentage 2 of ACK.
  • the second parameter is the percentage of NACK in the feedback information sent by the first terminal device to the terminal device of the first multicast group within the preset time period; or, the second parameter is the percentage of NACK in the preset time period.
  • a terminal device receives the percentage of NACK in the feedback information from the terminal device of the first multicast group.
  • the feedback information may be feedback information sent based on the foregoing first feedback manner.
  • the percentage of NACK may reflect the channel quality between the first terminal device and the second terminal device. Exemplarily, the percentage 1 of NACK is greater than the percentage 2 of NACK, and the channel quality corresponding to the percentage 2 of NACK is better than the channel quality corresponding to the percentage 1 of NACK.
  • preset time periods in the foregoing cases 1 to 6 may be the same or different.
  • a terminal device with better communication quality can be selected as the second terminal device, so that the available resources detected by the second terminal device are more accurate.
  • the communication quality is relatively high.
  • Step 602 The second terminal device selects a side row resource according to the resource selection parameter indicated by the index information.
  • the side resource selected by the second terminal device is the resource used for the first terminal device to send the side row information, that is, the second terminal device selects the side row resource for the first terminal device according to the resource selection parameter indicated by the index information .
  • the side resources selected by the second terminal device may also be referred to as auxiliary resources or available resources or idle resources or side resources free from interference by hidden nodes.
  • the second terminal device selects the side resource according to the resource selection parameter. Specifically, the second terminal device detects or detects and selects the resource from the resource pool according to the resource selection parameter, and selects the resource from the detected or detected and selected resource.
  • the first terminal device determines the side resource. It can also be understood that the resource detected or detected and selected by the second terminal device for the first terminal device is a resource that satisfies the resource selection parameter.
  • the index information may be referred to as first index information or parameter index information.
  • the index information is referred to as the first index information as an example.
  • the second terminal device determines the first index information, determines the resource selection parameter indicated by the first index information according to the first index information, and then assists the first terminal device in selecting resources from the resource pool according to the resource selection parameter indicated by the first index information.
  • the second terminal device determines the first index information description.
  • the first index information may be carried in the SCI or the medium access control control element (MAC CE) of the media access control layer sent by the first terminal device to the second terminal device.
  • MAC CE medium access control control element
  • the first index information is carried in the SCI sent by the first terminal device to the second terminal device.
  • the second terminal device obtains the first index information from the SCI, determines resource selection parameters according to the first index information, and then assists the first terminal device to detect resources from the resource pool according to the resource selection parameters .
  • the first index information may be carried in the first-level SCI of the two-level SCI sent by the first terminal device to the second terminal device, and the first-level SCI may be referred to as the first SCI.
  • the first index information may also be carried in the second-level SCI of the two-level SCI sent by the first terminal device to the second terminal device, and the second-level SCI may be referred to as the second SCI.
  • the second SCI is related to the first SCI. Specifically, the first SCI indicates the format of the second SCI, or the first SCI indicates whether the second SCI carries the first index information, or the first SCI indicates the second SCI Carry the first index information.
  • the format of the second SCI is different from the format of the existing second SCI. That is, the format of the second SCI indicated in the first SCI is a newly introduced format.
  • the first index information is carried in the first SCI.
  • the first index information is carried in the first SCI.
  • the first index information is carried in reserved bits and/or unreserved bits in the first SCI.
  • Unreserved bits can be understood as the bits in the first SCI other than the reserved bits, for example, the bits corresponding to the priority in the first SCI, the bits corresponding to the frequency domain resource allocation, and the bits corresponding to the time domain resource allocation. Bit position, bit position corresponding to the resource reservation period, bit position corresponding to the modulation and coding scheme table, or bit position corresponding to the DMRS mode/DMRS pattern.
  • the first index information is carried in x reserved bits in the first SCI.
  • x is 2 or 3.
  • the first index information is carried in x bits corresponding to the resource reservation period in the first SCI.
  • the first index information is carried in the unreserved bits in the first SCI, which can be understood as meaning that the first index information multiplexes the unreserved bits in the existing first-level SCI. Further, although some fields in the existing first-level SCI may be retained in the first SCI, these fields no longer indicate original information, and the first SCI is no longer used for resource reservation.
  • the bit corresponding to the priority is used to indicate the first index information.
  • other fields such as frequency domain resource allocation, time domain resource allocation, resource reservation period, etc., can be set as invalid fields.
  • This description is also applicable to the following first SCI multiplexing the first index information in the existing first-level SCI non-reserved bits, or the second SCI multiplexing the first index information in the existing second-level SCI non-pre-reserved bits In the embodiment where bits are reserved.
  • the second terminal device when the second terminal device receives the first SCI from the first terminal device, it can obtain the first index information from the first SCI, and determine the resource selection parameter according to the first index information, and then according to the resource The selection parameter assists the first terminal device to detect resources from the resource pool.
  • the first SCI includes first index information and first indication information, and the first indication information is used to indicate that the first SCI includes the first index information.
  • the first index information is carried in unreserved bits in the first SCI
  • the first indication information is carried in reserved bits in the first SCI.
  • the first indication information is carried in 1 reserved bit in the first SCI
  • the first index information is carried in x bits corresponding to the resource reservation period in the first SCI.
  • the first indication information may take a value of 1 or 0.
  • the value of the first indication information is 1, indicating that the first index information is carried in the first SCI; the value of the first indication information is 0, indicating that the first index information is not carried in the first SCI .
  • the value of the first indication information is 0, indicating that the first index information is carried in the first SCI; the value of the first indication information is 1, indicating that the first index information is not carried in the first SCI .
  • the first index information is carried in reserved bits in the first SCI
  • the first indication information is carried in unreserved bits in the first SCI.
  • the first index information is carried in x reserved bits in the first SCI.
  • the first indication information is carried in 1 bit corresponding to the format field in the first SCI, that is, the first indication information is multiplexed with the second SCI level format field in the first SCI (hereinafter referred to as the format field).
  • the format field in the first SCI is different from the existing format field, it can be determined that the first SCI is used to indicate auxiliary resource selection.
  • the second terminal device when the second terminal device receives the first SCI, it may obtain the first index information from the first SCI according to the first indication information. Specifically, if the second terminal device determines that the first indication information indicates that the first index information is carried in the first SCI, the first index information is obtained from the first SCI; and the resource selection parameter is determined according to the first index information, and then according to The resource selection parameter assists the first terminal device to detect resources from the resource pool.
  • the first terminal device carries the first index information in the first SCI (first-level SCI), and can effectively transmit the first index information to the second terminal device in the case that there is no second-level SCI but only the first-level SCI , Instruct the second terminal device to assist the first terminal device to detect resources in the resource pool based on the resource selection parameter corresponding to the first index information.
  • first-level SCI first-level SCI
  • the first index information is carried in the second SCI.
  • the second SCI is associated with the first SCI, and the first SCI indicates the second SCI.
  • the first SCI indicates the format of the second SCI, or the first SCI indicates whether the second SCI carries the first index information, or the first SCI indicates the second SCI carries the first index information.
  • the first SCI can be divided into the following at least two ways to indicate that the first index information is carried in the second SCI.
  • Indication mode 1 The first indication information in the first SCI indicates that the first index information is carried in the second SCI.
  • the first SCI includes first indication information, and the first indication information is used to indicate that the second SCI includes the first index information.
  • the first indication information in the first SCI is carried in reserved bits in the first SCI
  • the first index information in the second SCI is carried in reserved bits and/or unreserved bits in the second SCI.
  • the first indication information is carried in 1 reserved bit in the first SCI
  • the first index information is carried in the bit corresponding to the HARQ process identifier in the second SCI, the bit corresponding to the newly transmitted indication, and the redundancy Any one or more of the bit corresponding to the version, the bit corresponding to the source ID, the bit corresponding to the target ID, and the bit corresponding to the CSI request.
  • the first indication information may take a value of 1 or 0.
  • the value of the first indication information is 1, indicating that the first index information is carried in the second SCI; the value of the first indication information is 0, indicating that the first index information is not carried in the second SCI .
  • the value of the first indication information is 0, indicating that the first index information is carried in the second SCI; the value of the first indication information is 1, indicating that the first index information is not carried in the second SCI .
  • the second terminal device may determine according to the first indication information that the second SCI carries the first index information, and then receives the second SCI, and obtains the first index information from the second SCI. Specifically, if the second terminal device determines that the first indication information indicates that the first index information is carried in the second SCI, it receives the second SCI and obtains the first index information from the second SCI; the second terminal device The index information determines the resource selection parameter, and then assists the first terminal device to detect the resource from the resource pool according to the resource selection parameter.
  • Indication mode 2 The format field in the first SCI indicates that the first index information is carried in the second SCI.
  • the format field in the first SCI indicates that the second SCI adopts the first format and/or the second format, respectively, as described below.
  • the format field in the first SCI indicates that the second SCI is the first format, and there may be three optional designs.
  • first index information is added to the second SCI of the first format, and the first index information is carried in reserved bits in the second SCI.
  • the second terminal device determines that the format field in the first SCI indicates that the second SCI is the first format, it receives the second SCI and obtains the first SCI from the reserved bits in the second SCI. Index information.
  • the first index information and the identification of the second terminal device are added to the second SCI of the first format, and the first index information and the identification of the second terminal device are both carried in the second SCI Reserved bits.
  • the identification of the terminal device obtains the first index information from the reserved bits in the second SCI.
  • the first index information, the identification of the first terminal device, and the identification of the second terminal device are added to the second SCI of the first format.
  • the first index information, the identification of the first terminal device Both the identifier of the second terminal device and the second terminal device are carried in reserved bits in the second SCI.
  • the second terminal device receives the first SCI, if it is determined that the format field in the first SCI indicates that the second SCI is the first format, and the second terminal device determines that the received reserved bits in the second SCI include the first format
  • the identification of a terminal device and the identification of the second terminal device obtain the first index information from the reserved bits in the second SCI.
  • identifiers mentioned in this application can be for services, or for terminal devices that send services, or both for terminal devices that send services and services. .
  • the destination identifier refers to the destination identifier corresponding to the data/service transmitted by the first terminal device; the source identifier refers to the first terminal device related , Or an identifier related to the service of the first terminal device.
  • the identity of the first terminal device is the source identity
  • the identity of the second terminal device is the destination identity
  • the identifier of the first terminal device is the destination identifier
  • the identifier of the second terminal device is the source identifier.
  • the purpose identifier in this application is the newly introduced purpose identifier.
  • the source identifier in this application is the newly introduced source identifier.
  • the newly introduced target identifier is the identifier of the terminal device that feeds back the auxiliary resource.
  • the first terminal device sends control information to the second terminal
  • the destination identifier may be an identifier related to the second terminal device.
  • the target identifier may be an identifier associated with the identifier of the second terminal device; the target identifier may be an identifier associated with the service sent to the second terminal device; or the target identifier may be associated with the identifier of the second terminal device
  • the identifier is an identifier associated with the service sent to the second terminal device.
  • the source identifier refers to the identifier associated with the identifier of the first terminal device, the identifier associated with the service sent by the first terminal device, or the identifier associated with the first terminal device.
  • the identifier associated with the identifier of the terminal device and the identifier associated with the service sent by the first terminal device are identical to the first terminal device.
  • the newly introduced source identifier refers to the source identifier that triggers the feedback of the auxiliary resource, or the source identifier that requests the feedback of the auxiliary resource, or the source identifier that indicates the feedback of the auxiliary resource.
  • the newly introduced source identification can reuse the current existing source identification, or can be an extension on the basis of the existing source identification (the specific extension is as follows).
  • the transmitted data is a general term, that is, the transmitted data can be understood as the transmitted information.
  • the information can be feedback request information or feedback information.
  • auxiliary resources can be understood as available resources.
  • the source identifier contained in the control information or MAC CE may contain more bits. In this way, the communication source can be more accurately identified, so that the destination terminal can be more accurately identified during feedback.
  • the identifier of the terminal that feeds back the available resources included in the control information may contain more bits. This can more accurately identify the communication destination terminal.
  • the bits included in the source identifier included in the control information can be extended to 12 or 16.
  • the bits included in the identifier of the terminal that feeds back the available resources included in the control information can be extended to 20 or 24.
  • the identification of the first terminal device and the identification of the second terminal device are added to instruct the second terminal device to assist the first terminal device in detecting resources in the resource pool . It is explained that the first terminal device needs to send sideline information to the third terminal device, but if the second terminal device is instructed to assist the first terminal device in detecting resources in the resource pool, it will carry two sets of identifiers in the second SCI:
  • the group identifier is the identifier of the first terminal device (the terminal device on the sending side) and the identifier of the third terminal device (the terminal device on the receiving side), and is used to indicate a pair of terminal devices that perform sideline transmission.
  • the second group of identifiers is the identifier of the first terminal device (primary terminal device) and the identifier of the third terminal device (auxiliary terminal device), and is used to indicate a pair of terminal devices for resource detection.
  • the second SCI only adds the identification of the second terminal device and the first index information, which can also be used to indicate The second terminal device assists the first terminal device to detect resources in the resource pool.
  • the format field in the first SCI indicates that the second SCI is the second format, and the second SCI of the second format is composed of the identifier of the first terminal device, the identifier of the second terminal device, and the first index information.
  • the second terminal device receives the first SCI, if it is determined that the format field in the first SCI indicates that the second SCI is in the second format, and the second terminal device determines that the received second SCI includes the first terminal device’s ID and the ID of the second terminal device, the first index information is obtained from the second SCI.
  • the second terminal device After the second terminal device receives the first SCI, if it is determined that the format field in the first SCI indicates that the second SCI is in the second format, and the second terminal device is Identify the terminal that learns to trigger the selection of the auxiliary resource, and learn the terminal that is triggered to select the auxiliary resource according to the identifier of the second terminal device included in the second SCI. Furthermore, the second terminal device obtains the first index information from the second SCI.
  • the format field in the first SCI indicates the first format and/or the second format adopted by the second SCI, which is essentially the newly defined second-level SCI format. That is, the second SCI is essentially the second level SCI of the newly defined format.
  • the first index information is added, or the first index information and the identification of the second terminal device are added, or the first index information is added.
  • the second-level SCI with a newly defined format can be expressed as SCI 2-c.
  • the newly defined second-level SCI In the second format of the newly defined second-level SCI, all fields in the original second-level SCI are deleted, and the newly-defined second-level SCI consists of the first index information, the identification of the first terminal device, and the identification of the second terminal device. composition. Further, the newly defined second-level SCI can be called the third-level SCI, and the third-level SCI is indicated by the first-level SCI. In the embodiments of this application, the second-level SCI with a newly defined format can be expressed as SCI 2-d.
  • the second terminal device may determine the format adopted by the second SCI according to the format field of the first SCI, and then determine whether the first index information and the first index information exist in the second SCI Which bits are carried in the second SCI, so that the second terminal device can quickly obtain the first index information.
  • the first index information indicates the resource selection parameter, which can be understood as follows: the first index information corresponds to the resource selection parameter, or the first index information corresponds to the resource selection parameter of the first terminal device, or the first terminal device An index information corresponds to the resource selection parameter of the first terminal device. "Correspondence" can be replaced with “associated with.”
  • the resource selection parameters include at least one or more of resource reservation period, priority, initial threshold, threshold increase times, maximum threshold, resource detection related time length, data volume, and packet delay budget.
  • the resource selection parameter is a parameter, such as priority, or resource reservation period, or initial threshold.
  • the resource selection parameters are two parameters, such as priority and resource reservation period, or resource reservation period and initial threshold, or priority and initial threshold, and so on.
  • the resource selection parameters are three parameters, such as priority, resource reservation period, and initial threshold, or priority, initial threshold, and threshold increase times.
  • the resource selection parameter is another number of parameters, which will not be repeated here.
  • the second terminal device may determine the resource selection parameter indicated by the first index information based on the first index information.
  • both the first terminal device and the second terminal device are configured with configuration information, and the configuration information includes M1 correspondences, and each correspondence is a correspondence between index information and resource selection parameters.
  • the resource selection parameters may include one or a combination of the following parameters: at least one of resource reservation period, priority, initial threshold, threshold increase times, resource detection related duration, maximum threshold, data volume, and packet delay budget Item or multiple items.
  • the configuration information includes a one-to-one correspondence between M1 index information and M1 resource selection parameters; if the resource selection parameter includes a combination of multiple parameters, the configuration information includes M1 There is a one-to-one correspondence between the index information and the resource selection parameters of the M1 group, and M1 is a positive integer.
  • the first index information is one of M1 index information.
  • the configuration information may be referred to as first configuration information, or parameter configuration information. Take the configuration information as the first configuration information as an example.
  • the resource selection parameters corresponding to index information 1 are "priority 1, resource reservation period 1 ms, and number of subcarriers 5" ;
  • the resource selection parameters corresponding to index information 2 are "priority 3, resource reservation period 5ms, number of subcarriers 3" and so on.
  • the first terminal device When the first terminal device needs to detect the resource, it sends the first index information to the second terminal device. Correspondingly, after receiving the first index information, the second terminal device determines the first configuration information, and determines the resource selection parameter corresponding to the first index information according to the M1 correspondences in the first index information and the first configuration information .
  • the first terminal device sends index information 1 to the second terminal device.
  • the second terminal device determines the first configuration information.
  • the first configuration information includes There are M1 correspondences, and the second terminal device determines the resource selection parameters corresponding to the index information 1 as "priority 1, resource reservation period 1 ms, and number of subcarriers 5" according to the index information 1 and the M1 correspondence.
  • the first configuration information may be specified by a protocol or configured by a network device.
  • the network device sends the first configuration information to the first terminal device and the second terminal device respectively, and correspondingly, the first terminal device receives the information from the network
  • the first configuration information of the device determines the M1 correspondence; the second terminal device receives the first configuration information from the network device and determines the M1 correspondence.
  • the network device when the network device sends the first configuration information to the first terminal device and the second terminal device, the granularity of the resource pool or the granularity of the side link may be used.
  • the granularity of the resource pool or the granularity of the side link may be used.
  • the network device records all current resource pools and the terminal devices associated with each resource pool. For each resource pool, the network device can determine the configuration information corresponding to the resource pool, and configure the configuration information corresponding to the resource pool to the terminal device associated with the resource pool. The network equipment determines the configuration information based on each resource pool, which is pertinent.
  • the network device records the resource pool identifiers of the resource pools where the first terminal device and the second terminal device are located in the first configuration information corresponding to the resource pool. It can also be said that the resource pool identifiers in the first configuration information are associated
  • the M1 correspondences in the first configuration information are associated with the correspondence between the first index information and the resource selection parameter, or in other words, the correspondence between the index information and the resource selection parameter in the first configuration information is associated with the first configuration information
  • the resource pool corresponding to the resource pool identifier in the middle It can be understood that the corresponding relationship between the index information and the resource selection parameter in the first configuration information is applied to the resource pool corresponding to the resource pool identifier.
  • the network device sends the first configuration information to the first terminal device and the second terminal device respectively, and correspondingly, the first terminal device and the second terminal device respectively determine M1 correspondences according to the first configuration information.
  • the network device sends first configuration information to all terminal devices in the resource pool, so that all terminal devices in the resource pool receive the first configuration information, and determine M1 correspondences according to the first configuration information.
  • the network device broadcasts the first configuration information, and the terminal device in the resource pool, after receiving the first configuration information, determines that the resource pool identifier in the first configuration information is consistent with the resource pool identifier of the resource pool where it is located, then according to the first configuration information A configuration information determines M1 correspondences.
  • the network device may configure the first configuration information for all terminal devices connected to the network device.
  • the network device sends the first configuration information to all terminal devices connected to the network device, and correspondingly, each terminal device receives the first configuration information, and determines M1 correspondences according to the first configuration information.
  • the first configuration information may be configured by the network device through any one or more of RRC signaling, MAC layer signaling (for example, MAC CE), and physical layer signaling (for example, DCI or PDCCH). /Instructions/sent.
  • the resource selection parameters indicated by the first index information include an initial threshold, the number of times the threshold is raised, a priority, and a resource reservation period.
  • the second terminal device selects the side resource according to the resource selection parameter may specifically be that the second terminal device targets any resource in the resource pool, if the priority in the resource selection parameter is greater than the priority of the terminal device that has occupied the resource, and the resource selection The initial threshold in the parameter is greater than the current signal strength value on the resource, then the resource is determined as an available resource, otherwise, the resource is determined as an unavailable resource.
  • the second terminal device may also select periodic resources from the resource pool according to the resource reservation period in the resource selection parameter, for example, detecting resources with the above resource reservation period as the period, and each resource reservation period There are N resources in it.
  • the second terminal device detects the resources according to the priority and the initial threshold, and if the ratio of the detected available resources is less than or equal to the preset ratio, the initial threshold may be increased by the preset offset to obtain the increased threshold.
  • the second terminal device detects resources in the resource pool according to the priority and the raised threshold, until the detected ratio of available resources is greater than the preset ratio.
  • the number of times of raising the threshold of the second terminal device is not greater than the number of times of raising the threshold in the resource selection parameter. If the number of times of raising the threshold of the second terminal device reaches the number of times of raising the threshold, it still cannot detect available resources greater than the preset ratio. Then the second terminal device determines that the resource detection fails.
  • the second terminal device selects the side row resource according to the resource selection parameter indicated by the first index information.
  • the resource selection parameter indicated by the first index information For details, please refer to the prior art based on the resource reservation period, priority, initial threshold, and threshold increase times of the terminal device. , At least one or more of resource detection related time length, data volume, maximum threshold, and packet delay budget, to detect the implementation of resources from the resource pool. I won't repeat them here.
  • the second terminal device may also determine the current CBR or channel utilization ratio (CR), and the current CBR or the current CR is used as a condition for the second terminal device to determine whether to assist in detecting resources.
  • CBR channel utilization ratio
  • the second terminal device when the second terminal device receives the first index information from the first terminal device, it determines whether the current CBR is less than or equal to the CBR threshold, and if so, assists the first terminal device to detect resources in the resource pool; otherwise, no Assist the first terminal device to detect resources in the resource pool.
  • the second terminal device when the second terminal device receives the first index information from the first terminal device, it determines whether the current CR is less than or equal to the CR threshold, and if so, assists the first terminal device to detect resources in the resource pool; otherwise, no Assist the first terminal device to detect resources in the resource pool.
  • the use of resources in the resource pool is judged by CBR or CR to avoid signaling interaction caused by the second terminal device assisting the first terminal device in detecting resources in the case of resource congestion, which further affects communication performance.
  • Step 603 The second terminal device sends resource indication information to the first terminal device.
  • the first terminal device receives the resource indication information from the second terminal device.
  • the side row resource selected by the second terminal device can be used for the first terminal device to send side row information, where the side row information includes side row control information and/or side row data information.
  • the second terminal device may determine the resource indication information used to indicate the side resource, and send the resource indication information to the first terminal device.
  • the resource indication information can be carried in the MAC CE sent by the second terminal device to the first terminal device, or carried by the second terminal device to the first terminal device. SCI sent by the first terminal device.
  • the MAC CE may be carried in the PSSCH scheduled by the SCI.
  • the resource indication information when the resource indication information is carried in the SCI sent by the second terminal device to the first terminal device, the resource indication information may be carried in the first level SCI of the two-stage SCI sent by the second terminal device to the first terminal device.
  • the first level SCI can be called the third SCI.
  • the resource indication information can also be carried in the second level SCI of the two-level SCI sent by the second terminal device to the first terminal device.
  • the second level SCI can be called the fourth SCI, and the fourth SCI is associated with the third SCI.
  • the third SCI indicates the format of the fourth SCI, or the third SCI indicates whether the fourth SCI carries resource indication information, or the third SCI indicates the fourth SCI carries resource indication information.
  • the following describes how the resource indication information is carried in the third SCI or the fourth SCI.
  • the resource indication information is carried in the third SCI.
  • the resource indication information is carried in unreserved bits in the third SCI.
  • Unreserved bits can be understood as the bits in the third SCI other than the reserved bits, for example, the bits corresponding to the priority in the third SCI, the bits corresponding to the frequency domain resource allocation, and the bits corresponding to the time domain resource allocation. Bit position, bit position corresponding to the resource reservation period, bit position corresponding to the modulation and coding scheme table, or bit position corresponding to the DMRS mode/DMRS pattern.
  • the resource indication information is carried in a field used for resource allocation in the third SCI.
  • the frequency domain resource indication information is carried in the bits corresponding to the time domain resource allocation in the third SCI, and the time domain resource indication information is carried in the bits corresponding to the frequency domain resource allocation in the third SCI; or, the frequency domain resource indication information is carried.
  • the time domain resource indication information is carried in the bits corresponding to the time domain resource allocation in the third SCI; or, both the frequency domain resource indication information and the time domain resource indication information are carried in the third SCI.
  • Bits corresponding to the time-domain resource allocation in the third SCI; or, both the frequency-domain resource indication information and the time-domain resource indication information are carried in the bits corresponding to the frequency-domain resource allocation in the third SCI.
  • the resource indication information is carried in the unreserved bits in the third SCI, which can be understood as the resource indication information multiplexing the unreserved bits in the existing first-level SCI. Further, although some fields in the existing first-level SCI may be reserved in the third SCI, these fields no longer indicate original information, and the third SCI is no longer used for resource reservation.
  • This description is also applicable to the following resource indication information in the third SCI multiplexing the unreserved bits in the existing first level SCI, and the resource indication information in the fourth SCI multiplexing the unreserved bits in the existing second SCI level ⁇ Example.
  • the first terminal device when the first terminal device receives the third SCI from the second terminal device, it can obtain resource indication information from the third SCI, and select the side resource according to the resource indication information, and then according to the side resource Send sideline information.
  • the third SCI includes resource indication information and second indication information
  • the second indication information is used to indicate that the third SCI includes resource indication information
  • the resource indication information is carried in unreserved bits in the third SCI
  • the second indication information is carried in reserved bits in the third SCI.
  • the second indication information is carried in 1 reserved bit in the third SCI
  • the resource indication information is carried in x bits corresponding to the resource reservation period in the third SCI.
  • the second indication information may take a value of 1 or 0.
  • the second indication information has a value of 1, indicating that the third SCI carries resource indication information; the second indication information has a value of 0, which indicates that the third SCI does not carry resource indication information.
  • the second indication information has a value of 0, indicating that the third SCI carries resource indication information; the second indication information has a value of 1, which indicates that the third SCI does not carry resource indication information.
  • the first terminal device may obtain resource indication information from the third SCI according to the second indication information. Specifically, if the first terminal device determines that the second indication information indicates that resource indication information is carried in the third SCI, it obtains the resource indication information from the unreserved bits in the third SCI; the first terminal device selects the side according to the resource indication information Line resources, and then send side line information according to the side line resources.
  • the resource indication information is carried in reserved bits in the third SCI, and the second indication information is carried in unreserved bits in the third SCI.
  • the first terminal device parses the second indication information from the unreserved bits, that is, when the first terminal device parses out the meaning of the unreserved bits as indicating side resources, the first terminal device can obtain the corresponding pre- Reserve the bits to parse out the resource indication information.
  • the resource indication information is carried in x reserved bits in the third SCI.
  • the second indication information is carried in 1 bit corresponding to the format field in the first SCI, that is, the second indication information is multiplexed with the format field in the third SCI.
  • the format field in the third SCI is different from the existing format field, it can be determined that the third SCI is used to indicate side row resources.
  • the second terminal device carries the resource indication information in the third SCI (first-level SCI), and can effectively transmit the resource indication information to the first terminal device in the case that there is no second-level SCI and only the first-level SCI, indicating The first terminal device selects the side resource based on the resource indication information.
  • the resource indication information is carried in the fourth SCI.
  • the fourth SCI is associated with the third SCI, and the third SCI indicates the fourth SCI.
  • the third SCI indicates the format of the fourth SCI, or the third SCI indicates whether the fourth SCI carries resource indication information, or the third SCI indicates the fourth SCI carries resource indication information.
  • the third SCI can be divided into the following at least two ways to indicate that the resource indication information is carried in the fourth SCI.
  • Indication mode 1 The second indication information in the third SCI indicates that the resource indication information is carried in the fourth SCI.
  • the third SCI includes second indication information, and the second indication information is used to indicate that the fourth SCI includes resource indication information.
  • the second indication information in the third SCI is carried in reserved bits in the third SCI
  • the resource indication information in the fourth SCI is carried in reserved bits and/or unreserved bits in the fourth SCI.
  • the second indication information is carried in 1 reserved bit in the third SCI
  • the resource indication information is carried in the bit corresponding to the HARQ process identifier in the fourth SCI, the bit corresponding to the new transmission indication, and the redundancy version. Any one or more of the corresponding bit, the bit corresponding to the source ID, the bit corresponding to the target ID, and the bit corresponding to the CSI request.
  • the second indication information may take a value of 1 or 0.
  • the second indication information has a value of 1, indicating that the fourth SCI carries resource indication information; the second indication information has a value of 0, which indicates that the fourth SCI does not carry resource indication information.
  • the second indication information has a value of 0, indicating that the fourth SCI carries resource indication information; the second indication information has a value of 1, which indicates that the fourth SCI does not carry resource indication information.
  • the second terminal device may determine, according to the second indication information, that the fourth SCI carries resource indication information, and then receive the fourth SCI, and obtain the resource indication information from the fourth SCI. Specifically, if the first terminal device determines that the second indication information indicates that resource indication information is carried in the fourth SCI, it receives the fourth SCI and obtains the resource indication information from the fourth SCI; the first terminal device selects according to the resource indication information The side travel resources, and then send the side travel information according to the side travel resources.
  • Indication mode 2 The format field in the third SCI indicates that the resource indication information is carried in the fourth SCI.
  • the format field in the third SCI indicates that the fourth SCI adopts the third format, and the fourth SCI of the third format is composed of the identifier of the first terminal device, the identifier of the second terminal device, and resource indication information.
  • the first terminal device receives the third SCI, if it is determined that the format field in the third SCI indicates that the fourth SCI is in the third format, and the first terminal device determines that the received fourth SCI includes the first terminal device’s
  • the identifier and the identifier of the second terminal device obtain resource indication information from the fourth SCI.
  • the first terminal device After the first terminal device receives the third SCI, if it is determined that the format field in the third SCI indicates that the fourth SCI is in the third format, and it is known to be triggered according to the identification of the second terminal device contained in the fourth SCI.
  • the format field in the third SCI indicates the third format adopted by the fourth SCI, which is essentially the newly defined second-level SCI format. That is, the fourth SCI is essentially the second-level SCI of the newly defined format.
  • the redefined second-level SCI is composed of resource indication information, the identification of the first terminal device, and the identification of the second terminal device.
  • the newly defined second-level SCI can be called the fourth-level SCI, and the fourth-level SCI is indicated by the first-level SCI.
  • the newly defined second-level SCI can be referred to as a second-level SCI with a newly defined format
  • the second-level SCI is associated with the first-level SCI and is indicated by the format field in the first-level SCI.
  • the second-level SCI with a newly defined format can be expressed as SCI 2-e.
  • the second-level SCI since the second-level SCI is located in the PSSCH, it helps to reduce the load requirement.
  • the SCI bearing index information may be referred to as a trigger SCI, and the trigger SCI is used to trigger the second terminal device to assist the first terminal device in detecting resources in the resource pool.
  • the SCI carrying resource indication information can be referred to as feedback SCI or auxiliary SCI.
  • the feedback SCI or auxiliary SCI is used to indicate the resource detected by the second terminal device in the resource pool, that is, it is used to instruct the first terminal device to send Sideline resources for sideline information.
  • Step 604 The first terminal device sends the side-line information through the side-line resource.
  • the first terminal device After the first terminal device receives the resource indication information from the second terminal device, it can select the side row resource according to the resource indication information, and send the side row information through the side row resource.
  • the side line information may be side line data information and/or side line control information.
  • the side row resource selected by the first terminal device may be partly the same as the side row resource indicated by the resource indication information, or all of it may be the same as that indicated by the resource indication information.
  • the indicated side row resources are the same.
  • the second terminal device assists the first terminal device to detect resources from the resource pool, avoiding the problem of hidden nodes, and helping to improve the accuracy of detecting available resources. Further, the first terminal device sends index information to the second terminal device, and the second terminal device selects the side resource from the resource pool according to the resource selection parameter indicated by the index information, and indicates the resource selection parameter through the index information.
  • the resource selection parameter One or more parameters may be included, which helps to reduce the signaling overhead of notifying resource selection parameters.
  • the embodiment of the present application also provides a communication method. For details, refer to the flowchart shown in FIG. 8.
  • Step 801 The second terminal device determines at least one resource set.
  • the second terminal device may actively trigger detection, that is, the second terminal device actively detects at least one resource set in the resource pool.
  • the active trigger detection may be based on enabling information from the network device, and the enabling information is used to enable the second terminal device to determine at least one resource set for the first terminal device.
  • enabling information may also be referred to as trigger information or activation information.
  • the disabling information can also be referred to as deactivation information.
  • the second terminal device may determine the resource set associated with the priority and the threshold from the resource pool based on the priority and the threshold.
  • the second terminal device determines a first resource set associated with the first priority and the first threshold from the resource pool based on the first priority and the first threshold, where for the first resource set included in the For any resource, the priority of other terminal devices on the resource is lower than the first priority, and the signal strength value on the resource is less than or equal to the first threshold.
  • the second terminal device determines that the priority of other terminal devices on the resource is lower than the first priority, and the signal strength value on the resource is less than or equal to the first threshold, it will The resource is determined to be a resource in the first resource set.
  • the second terminal device may determine the resource set associated with the priority from the resource pool based on the priority.
  • the second terminal device determines the first resource set associated with the first priority from the resource pool based on the first priority, where for any resource included in the first resource set, other terminal devices are The priority on this resource is lower than the first priority.
  • the resource is determined as the resource in the first resource set.
  • the second terminal device may determine the resource set associated with the threshold from the resource pool based on the threshold.
  • the second terminal device determines a first resource set associated with the first threshold from the resource pool based on the first threshold, where for any resource included in the first resource set, the signal strength on the resource The value is less than or equal to the first threshold.
  • the resource is determined as the resource in the first resource set.
  • the second terminal device may determine K resource sets from the resource pool based on one-to-one correspondence of K priorities and K thresholds, or K priorities, or K thresholds, where K is positive Integer.
  • the second terminal device may determine K resource sets from the resource pool based on K priorities and K thresholds. Among them, the kth priority is higher than the k+1th priority, and the kth threshold is lower than the k+1th threshold, and k is a positive integer and less than K.
  • the second terminal device first determines the first resource set associated with the first priority and the first threshold, and then determines the second resource set associated with the second priority and the second threshold,... , Determine the Kth resource set associated with the Kth priority and the Kth threshold, and finally obtain K resource sets.
  • the second terminal device may determine K resource sets from the resource pool based on K priorities. Among them, the kth priority is higher than the k+1th priority, and k is a positive integer and less than K. The second terminal device first determines the first resource set associated with the first priority, and then determines the second resource set associated with the second priority, ..., determines that it is associated with the Kth priority The Kth resource set of, and finally K resource sets are obtained.
  • the second terminal device may determine K resource sets from the resource pool based on K thresholds.
  • the kth threshold is lower than the k+1th threshold, and k is a positive integer and less than K.
  • the second terminal device first determines the first resource set associated with the first threshold, and then determines the second resource set associated with the second threshold, ..., determines the Kth set associated with the Kth threshold Resource sets, and finally K resource sets are obtained.
  • the interference degree of the resources in the k-th resource set is less than the interference degree of the resources in the k+1-th resource set, that is, the resources in the k-th resource set are better than the resources in the k+1-th resource set .
  • the first terminal device may first select the side row resource from the k th resource set, and then select the side row resource from the k+1 th resource set. It can also be understood that the use priority of the k-th resource set is higher than the use priority of the k+1-th resource set.
  • K is 2, the second terminal device first determines the second resource set based on the second priority and the second threshold, and then determines the third resource set based on the third priority and the third threshold.
  • the second priority is higher than the third priority
  • the second threshold is lower than the third threshold.
  • K is 2, the second terminal device first determines the second resource set based on the second priority, and then determines the third resource set based on the third priority. Among them, the second priority is higher than the third priority.
  • K is 2, the second terminal device first determines the second resource set based on the second threshold, and then determines the third resource set based on the third threshold. Wherein, the second threshold is lower than the third threshold.
  • the interference degree of the resources in the second resource set is less than the interference degree of the resources in the third resource set, that is, the resources in the second resource set are better than the resources in the third resource set.
  • the second resource set may be referred to as a preferentially available resource set
  • the third resource set may be referred to as a supplementary available resource set, that is, the first terminal device may first select from the second resource set Select the side resource, and then select the side resource from the third resource set. It can also be understood that the use priority of the second resource set is higher than the use priority of the third resource set.
  • each resource set corresponds to a priority and/or threshold, where the priority corresponding to the resource set is a reference for the second terminal device to determine the resource set Priority, the threshold corresponding to the resource set is the reference threshold for the second terminal device to determine the resource set.
  • the priority and/or threshold corresponding to the resource set may be configured by signaling.
  • the signaling may be RRC signaling or MAC signaling from the network device; it may also be PC5 RRC signaling from the first terminal device.
  • the second terminal device may receive signaling from the network device or the first terminal device, and the signaling includes the priority and/or threshold corresponding to at least one resource set. Accordingly, the second terminal device may Based on the priority and/or threshold corresponding to each resource set, the resource set is determined from the resource pool.
  • the second terminal device may receive signaling from the network device or the first terminal device, and the signaling includes the initial priority and/or the initial threshold.
  • the second terminal device performs the following:
  • the second terminal device determines the resource set corresponding to the initial priority and/or the initial threshold from the resource pool based on the initial priority and/or the initial threshold.
  • the second terminal device adjusts the initial priority and/or the initial threshold according to the preset rule to obtain the priority and/or threshold after the first adjustment, and then based on the priority and/or threshold after the first adjustment , Determine the resource set corresponding to the first adjusted priority and/or threshold from the resource pool.
  • the second terminal device adjusts the priority and/or threshold value after the first adjustment according to the preset rule to obtain the priority and/or threshold value after the second adjustment, and then based on the priority after the second adjustment And/or threshold, determine the resource set corresponding to the second adjusted priority and/or threshold from the resource pool.
  • the four steps can also be performed independently.
  • the priority and/or threshold after each adjustment is obtained respectively.
  • the second terminal device has a total of K priorities and/or K thresholds (including initial priority and/or initial threshold), where K priorities and/or K thresholds are interpreted as K priorities, or K A threshold, or K pair priority and threshold.
  • K priorities and/or K thresholds are interpreted as K priorities, or K A threshold, or K pair priority and threshold.
  • the second terminal device obtains a resource set corresponding to each priority, or a resource set corresponding to each threshold, or a resource set corresponding to each pair of priorities and thresholds, respectively, according to the K priorities and/or K thresholds.
  • the second terminal device adjusts the priority and/or the threshold according to the preset rule, the adjusted priority is lower than the priority before the adjustment, and the adjusted threshold is higher than the threshold before the adjustment.
  • the second terminal device determines the resource set from the resource pool. It is understood that when the proportion of the available resources determined by the second terminal device from the resource pool is greater than the preset proportion, the determined available resources are composed Resource collection. Based on this, when the ratio of the available resources detected by the second terminal device in the resource pool based on the priority and/or the threshold is less than or equal to the preset ratio, the second terminal device needs to increase the threshold by the preset offset to be increased Then, according to the priority and/or the raised threshold, resources are detected from the resource pool again.
  • the ratio of the available resources detected in the resource pool by the second terminal device is less than or equal to the preset ratio, and the second terminal device pairs The initial threshold is increased by the preset offset to obtain the increased threshold.
  • the raised threshold is the sum of the initial threshold and the preset offset.
  • the second terminal device continues to detect according to the raised threshold value, compares the signal strength value of the resource in the resource pool with the raised threshold value, and obtains the resource whose signal strength value is less than the raised threshold value as the available resource, and the second terminal The device determines whether the ratio of the detected available resources is greater than the preset ratio.
  • the second terminal device cyclically increases the threshold value according to the preset offset, until the ratio of the available resources detected by the second terminal device in the resource pool is greater than the preset ratio. After the second terminal device determines the resource set corresponding to the priority and/or the threshold after at least one increase from the resource pool based on the initial priority and/or the threshold value after at least one increase, the second terminal device then determines the resource set corresponding to the priority and/or the threshold value after at least one increase from the resource pool. The priority and/or threshold are gradually adjusted, and the resource set corresponding to the priority and/or threshold after each adjustment is determined, until K resource sets are determined.
  • the number of threshold raising times may be preset, and the number of times the second terminal device cyclically raises the threshold value is less than or equal to the threshold raising times.
  • the maximum threshold value may be preset, and the threshold value after the second terminal device is raised is less than or equal to the maximum threshold value. It can also be understood that the maximum threshold is the value obtained after the initial threshold has been increased by the number of threshold elevations, or the maximum threshold is greater than or equal to the value obtained after the initial threshold has been increased by the number of threshold elevations.
  • the initial threshold is a
  • the preset offset is ⁇ a
  • the number of times the threshold is raised is b max
  • the maximum threshold is a max
  • the threshold value obtained by the second terminal device after raising the initial threshold by b 1 times is a+b 1 ⁇ a, where b 1 is less than or equal to b max , and a+b 1 ⁇ a is less than or equal to a max .
  • the second terminal device may receive the PC5RRC signaling from the first terminal device.
  • the first terminal device carries the priority and/or threshold associated with the first terminal device in the PC5RRC signaling, and The PC5RRC signaling is sent to the second terminal device.
  • the second terminal device receives the PC5RRC signaling, uses the priority associated with the first terminal device in the PC5RRC signaling as the initial priority, and/or uses the threshold associated with the first terminal device as the initial threshold.
  • the steps of determining K resource sets from the resource pool can be specifically referred to the first to fourth steps above.
  • the kth priority is higher than the k+1th priority, which is equivalent to that the value of the kth priority is lower than the value of the k+1th priority, and the priority is adjusted according to the preset rule, which can be The priority value is increased according to the preset rules, and the priority is reduced accordingly.
  • the kth threshold is lower than the k+1th threshold, and the threshold is adjusted according to a preset rule, and the threshold may be increased according to a preset rule.
  • the use priority of the kth resource set corresponding to the kth priority and/or threshold is higher than the use priority of the k+1th resource set corresponding to the k+1th priority and/or threshold class.
  • a certain resource set determined by the second terminal device may include N resources, or include periodic N resources, where N is a positive integer.
  • the resource set includes periodic N resources, refer to FIG. 3 as an example.
  • the resource set includes multiple resource reservation periods, and each resource reservation period includes 3 resources.
  • the second terminal device may also determine the current CBR or CR, and the current CBR or the current CR is used as a condition for the second terminal device to determine whether to actively assist in detecting resources.
  • the second terminal device may first determine whether the current CBR is less than or equal to the CBR threshold, and if so, assist the first terminal device in detecting resources in the resource pool; otherwise, it does not assist the first terminal device in detecting resources in the resource pool.
  • the second terminal device may first determine whether the current CR is less than or equal to the CR threshold, and if so, assist the first terminal device in detecting resources in the resource pool; otherwise, it does not assist the first terminal device in detecting resources in the resource pool.
  • the use of resources in the resource pool is judged by CBR or CR to avoid signaling interaction caused by the second terminal device assisting the first terminal device in detecting resources in the case of resource congestion, which further affects communication performance.
  • Step 802 The second terminal device sends resource indication information to the first terminal device.
  • the first terminal device receives the resource indication information from the second terminal device.
  • the second terminal device After determining the at least one resource set, the second terminal device determines resource indication information for indicating the at least one resource set, and sends the resource indication information of the at least one resource set to the first terminal device.
  • the second terminal device determines a resource set, the second terminal device sends resource indication information for indicating the resource set to the first terminal device. If the second terminal device determines multiple resource sets, the second terminal device sends resource indication information for indicating each resource set to the first terminal device.
  • the one resource set may be a resource set determined by the second terminal device, or may be one of multiple resource sets determined by the second terminal device.
  • the resource set may be a bitmap representation of the resource.
  • each bit or each z bit of the bitmap can correspond to a piece of resource.
  • a piece of resource includes frequency domain resources and/or time domain resources.
  • the frequency domain resource includes at least one of the frequency domain starting point or the number of subchannels;
  • the time domain resource includes a slot (time slot) or information used to indicate the slot. Any one of the frequency domain resources and/or the time domain resources may be predefined, or notified by RRC signaling, or partly notified by RRC signaling, and partly predefined.
  • the z bit of the bitmap when one bit of the bitmap corresponds to the available state of a piece of resource, the one expressed as 1 is available or free; the one expressed as 0 is unavailable or occupied.
  • the z bit of the bitmap when the z bit of the bitmap corresponds to the available state of a resource, the z bit can be available with reference to a certain threshold or free with reference to a certain threshold; or, with reference to a certain threshold not available or occupied with reference to a certain threshold .
  • the z bit of the bitmap when the z bit of the bitmap corresponds to the available state of a resource, the z bit can be available according to a certain priority or idle according to a certain priority; or, unavailable according to a certain priority or according to a certain priority Level is occupied.
  • the z bit of the bitmap corresponds to the available state of a piece of resource
  • the z bit may be available according to a certain priority and a certain threshold, or idle according to a certain priority and a certain threshold; or, according to a certain priority And a certain threshold is not available or a certain priority and a certain threshold are occupied.
  • z is an integer greater than or equal to 2. The following can also be understood as a reference or reference.
  • the second terminal device may carry the resource set corresponding to the priority and/or threshold in the resource indication information. That is, the resource indication information is also used to indicate the priority and/or threshold corresponding to the resource set, and the priority and/or threshold corresponding to the resource set can be used by the first terminal device to select a side resource from at least one resource set, specifically Refer to step 803.
  • the threshold is an initial threshold, or a threshold of the resource set is determined.
  • the threshold value for determining the resource set can also be understood as the final use threshold value after the threshold value is raised.
  • the second terminal device may carry the number of threshold raising times corresponding to the resource set in the resource indication information. That is, the resource indication information is also used to indicate the number of times the threshold value is raised corresponding to the resource set, and the number of times the threshold value is raised corresponding to the resource set can be used by the first terminal device to select a side row resource from at least one resource set. For details, refer to step 803 .
  • each resource set corresponds to a use priority
  • the resource indication information may also indicate the use priority of the resource set.
  • the K resource sets determined by the second terminal device are resource set 1, resource set 2,..., resource set K in order from high to low according to the priority of use, and respectively correspond to resource indication information 1, resource indication Information 2,..., resource indication information K.
  • the second terminal device may implicitly indicate the use priority of the K resource sets. Specifically, the second terminal device may assign the K resource indication information corresponding to the K resource sets respectively, according to the use priority. Arrange from high to low. For example, resource indication information 1, resource indication information 2, ..., resource indication information K.
  • the second terminal device may explicitly indicate the use priority of K resource sets. Specifically, the second terminal device may carry the use priority of each resource set in the corresponding resource indication information. For example, the use priority of resource set 1 is carried in the resource indication information 1, and the use priority of resource set 2 is carried in the resource indication information 2.
  • the use priority of resource set K is carried in the resource indication information K Grade K.
  • the resource indication information is also used to indicate the resource reservation period.
  • the resource reservation period corresponding to the resource set is used for the first terminal device to select a side row resource from at least one resource set. For details, refer to step 803.
  • the resource indication information When the resource indication information is also used to indicate the resource reservation period, it may include index information in the resource indication information.
  • the index information may be referred to as second index information, or periodic index information, and the index information is used to indicate the resource reservation period of the corresponding resource set.
  • the index information is referred to as the second index information as an example.
  • the second index information included in the resource indication information corresponding to the resource set is used to indicate the resource reservation period of the resource set.
  • the first terminal device may determine the resource reservation period indicated by the second index information based on the second index information.
  • both the first terminal device and the second terminal device are configured with configuration information
  • the configuration information includes a one-to-one correspondence between M2 index information and M2 resource reservation periods, and the second index information It is one of M2 index information, and M2 is a positive integer.
  • the configuration information may be referred to as second configuration information or periodic configuration information.
  • the configuration information is referred to as the second configuration information as an example.
  • Fig. 9 is a schematic diagram of the corresponding relationship between index information and resource reservation period provided by this application, the resource reservation period corresponding to index information 1 is 1 ms; the resource reservation period corresponding to index information 2 is 10 ms, etc. .
  • the second terminal device determines the resource reservation period corresponding to the resource set, and carries second index information for indicating the resource reservation period in the resource indication information and sends it to the first terminal device.
  • the first terminal device determines the second configuration information, and determines the resource reservation period corresponding to the second index information according to the M2 correspondences in the second index information and the second configuration information.
  • the resource reservation period is the resource reservation period in the auxiliary resource selection.
  • the second terminal device determines that the resource reservation period corresponding to the resource set is 10 ms, and carries index information 2 indicating the resource reservation period of 10 ms in the resource indication information and sends it to the first terminal device.
  • the first terminal device determines the second configuration information.
  • the second configuration information includes M2 correspondences as shown in FIG. 9. The first terminal device determines that the resource reservation period is based on the index information 2 and the M2 correspondences. 10ms.
  • the second configuration information may be specified by a protocol or configured by a network device.
  • the network device sends the second configuration information to the first terminal device and the second terminal device respectively, and correspondingly, the first terminal device receives the information from the network
  • the second configuration information of the device determines the M2 correspondence; the second terminal device receives the second configuration information from the network device and determines the M2 correspondence.
  • the network device when the network device configures the second configuration information to the first terminal device and the second terminal device, the granularity of the resource pool or the granularity of the side link may be used.
  • the granularity of the resource pool or the granularity of the side link may be used.
  • the network device records all current resource pools and the terminal devices associated with each resource pool. For each resource pool, the network device may determine the configuration information corresponding to the resource pool, and configure the configuration information corresponding to the resource pool to the terminal device associated with the resource pool. The network equipment determines the configuration information based on each resource pool, which is pertinent.
  • the network device records the resource pool identifiers of the resource pools where the first terminal device and the second terminal device are located in the second configuration information corresponding to the resource pool. It can also be said that the resource pool identifiers in the second configuration information are associated
  • the M2 correspondences in the second configuration information are associated with the correspondence between the second index information and the resource reservation period, or in other words, the correspondence between the index information and the resource reservation period in the second configuration information is associated with the second The resource pool corresponding to the resource pool identifier in the configuration information.
  • the network device sends the second configuration information to the first terminal device and the second terminal device respectively, and correspondingly, the first terminal device and the second terminal device respectively determine M2 correspondences according to the second configuration information.
  • the network device sends the second configuration information to all the terminal devices in the resource pool, so that all the terminal devices in the resource pool receive the second configuration information, and determine the M2 correspondences according to the second configuration information.
  • the network device broadcasts the second configuration information, and the terminal device in the resource pool, after receiving the second configuration information, determines that the resource pool identifier in the second configuration information is consistent with the resource pool identifier of the resource pool where it is located, according to the second configuration information.
  • the configuration information determines M2 correspondences.
  • the network device may configure the second configuration information for all terminal devices connected to the network device.
  • the network device sends the second configuration information to all terminal devices connected to the network device, and correspondingly, each terminal device receives the second configuration information, and determines M2 correspondences according to the second configuration information.
  • the second configuration information may be configured by the network device through any one or more of RRC signaling, MAC layer signaling (for example, MAC CE), and physical layer signaling (for example, DCI or PDCCH) /Instructions/sent.
  • RRC signaling for example, MAC CE
  • MAC CE for example, MAC CE
  • PDCCH physical layer signaling
  • the existing first terminal device when it sends data to the second terminal device, it usually also carries a resource reservation period.
  • the second configuration information is different from the index value corresponding to the existing resource reservation period, and the second configuration information is specifically configured for this auxiliary resource selection.
  • the granularity of the resource reservation period included in the second configuration information may be greater than the granularity of the existing resource reservation period. In other words, the number of indexes corresponding to the resource reservation period included in the second configuration information may be less than the number of indexes corresponding to the existing resource reservation period.
  • the granularity of the resource reservation period included in the second configuration information is 10ms, for example, the resource reservation periods included in the second configuration information are 10ms, 20ms, 30ms,..., 90ms, 100ms, And there are 10 indexes corresponding to index1, index2,..., index10 respectively.
  • the granularity of the existing resource reservation period is 1ms.
  • the existing resource reservation periods are 1ms, 2ms, 3ms,...,99ms, 100ms, and correspond to 100 indexes of index1, index2,..., index100 respectively.
  • Auxiliary resource selection is different from reserving resources for sidelink data communication.
  • the notified auxiliary resource may or may not be used.
  • the granularity of the resource reservation period included in the second configuration information is larger than the granularity of the existing resource reservation period, which helps reduce the granularity of auxiliary resource division and simplifies the notification of auxiliary resources.
  • the resource indication information can be carried in the MAC CE sent by the second terminal device to the first terminal device, or carried by the second terminal device to the first terminal device. SCI sent by the first terminal device.
  • the resource indication information is carried in the SCI sent by the second terminal device to the first terminal device.
  • the resource indication information may be carried in the first level SCI of the two-stage SCI sent by the second terminal device to the first terminal device. This first level SCI is called the fifth SCI.
  • the resource indication information is carried in the second-level SCI of the two-level SCI sent by the second terminal device to the first terminal device.
  • the second-level SCI may be referred to as the sixth SCI, and the sixth SCI is associated with the fifth SCI ,
  • the fifth SCI indicates the format of the sixth SCI and other information.
  • the implementation of the resource indication information carried in the fifth SCI can refer to the implementation of the resource indication information carried in the third SCI
  • the implementation of the resource indication information carried in the sixth SCI can refer to the implementation of the resource indication information carried in the first SCI.
  • the SCI bearing the resource indication information can also be referred to as feedback SCI or auxiliary SCI.
  • the feedback SCI or auxiliary SCI is used to instruct the second terminal device to actively assist the first terminal device in the resource pool.
  • the detected at least one resource set that is, the at least one resource set used for the first terminal device to select the side resource.
  • Step 803 The first terminal device selects a side row resource from the at least one resource set according to the resource indication information.
  • the first terminal device may sequentially select the side row resources from each resource set according to the order of the use priority of at least one resource set from high to low.
  • the first terminal device may determine the use priority of the K resource sets according to the sequence of the K resource indication information, and then based on the use priority In order from high to low, select the side row resources from each resource set in turn.
  • the first terminal device may obtain the use priority of the K resource sets from the K resource indication information, and then obtain the usage priority from the K resource indication information based on the usage priority. In the order of high to low, select the side row resources from each resource set in turn.
  • the second terminal device determines the second resource set and the third resource set, and the second terminal device sends the resource indication information of the second resource set and the resource indication information of the third resource set to the first terminal device, which may be as follows Three ways to achieve.
  • the second terminal device arranges the resource indication information of the second resource set and the resource indication information of the third resource set in order from front to back. Correspondingly, the first terminal device selects the side row resource from the second resource set corresponding to the previous resource indication information. When determining that the resources in the second resource set are insufficient, the first terminal device selects the side row resource from the third resource set corresponding to the latter resource indication information.
  • the second terminal device carries the use priority of the second resource set in the resource indication information of the second resource set, and carries the use priority of the third resource set in the third resource set.
  • the first terminal device obtains the use priority in the resource indication information, and first selects the side row resource from the second resource set with the higher use priority.
  • the first terminal device selects a side row resource from a third resource set with a low priority.
  • the second terminal device indicates whether the resource set is the second resource set or the third resource set through the third indication information.
  • the third indication information occupies 1 bit, a value of 1 for the third indication information indicates that the resource set is the second resource set, and a value of 0 for the third indication information indicates that the resource set is the third resource set.
  • the second terminal device carries the third indication information with a value of 1 in the resource indication information of the second resource set, and carries the third indication information with a value of 0 in the resource indication information of the third resource set.
  • the first terminal device obtains the third indication information in the resource indication information, and first selects the side row resource from the second resource set corresponding to the third indication information with a value of 1. When determining that the resources in the second resource set are insufficient, the first terminal device selects the side row resource from the third resource set corresponding to the third indication information with a value of 0.
  • the resource indication information is also used to indicate the priority and/or threshold of at least one resource set.
  • the first terminal device may select the side row resource from the at least one resource set based on the priority and/or threshold of the at least one resource set indicated by the resource indication information.
  • the first terminal device may select from the at least one resource according to the priority associated with the first terminal device, the threshold associated with the first terminal device, and the priority and threshold of the at least one resource set indicated by the resource indication information. Select the side row resource in the collection. Specifically, the first terminal device is directed to any resource set in at least one resource set, if the priority associated with the resource set is lower than the priority associated with the first terminal device, and the threshold associated with the resource set is smaller than the first terminal device For the associated threshold, select the side row resource from the resource set.
  • the first terminal device may select the side resource from the at least one resource set according to the priority associated with the first terminal device and the priority of the at least one resource set indicated by the resource indication information. Specifically, for any resource set in at least one resource set, the first terminal device selects a side resource from the resource set if the priority associated with the resource set is lower than the priority associated with the first terminal device.
  • the first terminal device may select the side row resource from the at least one resource set according to the threshold value associated with the first terminal device and the threshold value of the at least one resource set indicated by the resource indication information. Specifically, for any resource set in at least one resource set, the first terminal device selects a side resource from the resource set if the threshold associated with the resource set is less than the threshold associated with the first terminal device.
  • the associated priority may be lower than the associated priority of the first terminal device, and/or the associated threshold is less than the associated threshold of the first terminal device
  • the resource collection is called the target resource collection.
  • the first terminal device selects the side row resource from the target resource set, it may specifically determine the i resources with the smallest signal strength value in the target resource set as the side row resource, where i is a positive integer and i is less than or equal to N .
  • Period Determine periodic n resources from the resource set, where n is a positive integer, and n is less than or equal to N.
  • the priority associated with the first terminal device is higher than the priority associated with the resource set to which the side row resource belongs, and/or the threshold associated with the first terminal device is greater than The threshold associated with the resource collection to which the side-row resource belongs.
  • the resource indication information may also indicate the number of times of raising the threshold of at least one resource set, that is, the total number of times the second terminal device raises the threshold when the resource set is determined.
  • the first terminal device may determine that the available resources in a certain resource set are obtained by raising the threshold several times based on the number of times of raising the threshold of at least one resource set indicated by the resource indication information, and therefore determine whether it can be Correct use or whether it can be used first.
  • the second terminal device may send resource indication information of the at least one resource set to multiple terminal devices, that is, the at least one resource set is not only used for the first terminal device to select side resources , Also used for other terminal equipment to select side resources.
  • the first terminal device determines the target resource set, it can use the resource competition method in the prior art to compete for resources with other terminal devices from the target resource set.
  • Step 804 The first terminal device sends the side-line information through the side-line resource.
  • the first terminal device After the first terminal device selects the side row resource from the at least one resource set, it may send the side row information through the side row resource. Specifically, it may be that the side row data information and/or the side row control information are sent to the third terminal device through the side row resource.
  • the second terminal device actively assists the first terminal device to detect at least one resource set from the resource pool, avoiding the problem of hidden nodes, and helping to improve the accuracy of detecting available resources. Further, the first terminal device does not need to send resource selection parameters to the second terminal device, which minimizes the signaling overhead between the first terminal device and the second terminal device.
  • the second terminal device may execute the process shown in FIG. 6 and the process shown in FIG. Detecting resources in the resource pool can also actively assist the first terminal device in detecting resources in the resource pool. In one case, the second terminal device actively assists the first terminal device to detect resources in the resource pool, and then receives the index information from the first terminal device, and then assists the first terminal device in the resource selection parameter indicated by the index information. Detect resources in the resource pool.
  • the foregoing mainly introduces the solution provided by this application from the perspective of interaction between various network elements.
  • the above-mentioned network elements include hardware structures and/or software modules corresponding to the respective functions.
  • the present invention can be implemented in the form of hardware or a combination of hardware and computer software. Whether a certain function is executed by hardware or computer software-driven hardware depends on the specific application and design constraint conditions of the technical solution. Professionals and technicians can use different methods for each specific application to implement the described functions, but such implementation should not be considered as going beyond the scope of the present invention.
  • corresponding steps or operations implemented by the terminal device may also be implemented by components (for example, a chip or a circuit) configured in the terminal device.
  • the embodiments of the present application also provide a device for implementing any of the above methods.
  • a device is provided that includes units (or means) for implementing each step performed by the terminal device in any of the above methods.
  • FIG. 10 and FIG. 11 are schematic structural diagrams of possible communication devices provided by this application. These communication devices can be used to implement the functions of the first terminal device or the second terminal device in the foregoing method embodiment, and therefore can also achieve the beneficial effects of the foregoing method embodiment.
  • the communication device may be the terminal device 1 or the terminal device 2 as shown in FIG. 1, and may also be a module (such as a chip) applied to the terminal device.
  • the communication device 1000 includes a processing unit 1001 and a communication unit 1002.
  • the communication unit 1002 may independently perform the receiving function and/or the sending function, or may perform the receiving function and/or the sending function under the control of the processing unit 1001.
  • the processing unit 1001 is used to control the communication unit 1002 to send index information to the second terminal device.
  • the information is used to indicate resource selection parameters, and the resource selection parameters are used to select side resources for the first terminal device; the processing unit 1001 is also used to control the communication unit 1002 to receive information from the second terminal device Resource indication information, where the resource indication information is used to indicate the side resource.
  • the resource selection parameter includes at least one of the following: resource reservation period, priority, initial threshold, number of threshold elevation, maximum threshold, resource detection related time length, data volume, packet delay Budget.
  • the index information is carried in a first SCI, and the first SCI is the first level SCI sent by the communication unit 1002 to the second terminal device; or, the index information It is carried by a second SCI, and the second SCI is a second level SCI sent by the communication unit 1002 to the second terminal device, and the second SCI is indicated by the first SCI.
  • the first SCI further includes first indication information, and the first indication information is used to indicate that the index information is included in the first SCI, or indicate that the index information is included in the second SCI. Including the index information.
  • the first indication information is carried in reserved bits in the first SCI.
  • the format field in the first SCI indicates the first format of the second SCI
  • reserved bits in the second SCI carry the index information
  • the reserved bits in the second SCI carry the index information and the identification of the second terminal device; and/or, in the first SCI
  • the second SCI is composed of the index information, the identifier of the first terminal device, and the identifier of the second terminal device.
  • the processing unit 1001 is further configured to determine configuration information, and the configuration information includes the corresponding relationship between the index information and the resource selection parameter.
  • the processing unit 1001 is further configured to control the communication unit 1002 to receive configuration information from the network device; the configuration information includes M1 correspondences, and each correspondence is an index and The corresponding relationship of one or a group of resource selection parameters, M1 is greater than or equal to 2.
  • the resource selection parameter may be one or a combination of the following parameters: resource reservation period, priority, initial threshold, threshold increase times, resource detection related duration, maximum threshold, data volume, and packet delay budget.
  • the configuration information further includes a resource pool identifier, and the corresponding relationship between the index information and the resource selection parameter is associated with the resource pool corresponding to the resource pool identifier.
  • the resource indication information is carried in a third SCI, and the third SCI is the first-level SCI received by the communication unit 1002 from the second terminal device; or, the resource The indication information is carried in the fourth SCI, the fourth SCI is the second level SCI received by the communication unit 1002 from the second terminal device, and the fourth SCI is indicated by the third SCI.
  • the third SCI further includes second indication information, and the second indication information is used to indicate that the third SCI includes the resource indication information, or indicate that the fourth SCI Includes the resource indication information.
  • the second indication information is carried in reserved bits in the third SCI.
  • the resource indication information is carried in a field used for resource allocation in the third SCI.
  • the processing unit 1001 is further configured to control the communication unit 1002 to send side-line information through the side-line resource after receiving the resource indication information from the second terminal device.
  • the communication unit 1002 is used to receive index information from the first terminal device; the processing unit 1001 is used to The resource selection parameter indicated by the index information selects a side row resource; the second terminal device sends resource indication information to the first terminal device, and the resource indication information is used to indicate the side row resource.
  • the resource selection parameter includes at least one of the following: resource reservation period, priority, initial threshold, number of threshold elevation, maximum threshold, resource detection related time length, data volume, packet delay Budget.
  • the index information is carried in a first SCI, and the first SCI is the first-level SCI received by the communication unit 1002 from the first terminal device; or, the index information It is carried by the second SCI, which is the second level SCI received by the communication unit 1002 from the first terminal device, and the second SCI is indicated by the first SCI.
  • the first SCI further includes first indication information, and the first indication information is used to indicate that the index information is included in the first SCI, or indicate that the index information is included in the second SCI. Including the index information.
  • the first indication information is carried in reserved bits in the first SCI.
  • the format field in the first SCI indicates the first format of the second SCI
  • reserved bits in the second SCI carry the index information
  • the reserved bits in the second SCI carry the index information and the identification of the second terminal device; and/or, in the first SCI
  • the second SCI is composed of the index information, the identifier of the first terminal device, and the identifier of the second terminal device.
  • the processing unit 1001 is further configured to determine configuration information; the configuration information includes the corresponding relationship between the index information and the resource selection parameter.
  • the communication unit 1002 is also used to receive configuration information from the network device; the configuration information includes M1 correspondences, and each correspondence is an index and one or a group of resource options.
  • the corresponding relationship of the parameters, M1 is greater than or equal to 2.
  • the resource selection parameter can be one or a combination of the following parameters: resource reservation period, priority, initial threshold, threshold increase times, resource detection related duration, maximum threshold, data volume, and packet delay budget.
  • the configuration information includes a resource pool identifier, and the corresponding relationship between the index information and the resource selection parameter is associated with a resource pool corresponding to the resource pool identifier.
  • the resource indication information is carried in a third SCI, and the third SCI is the first-level SCI sent by the communication unit 1002 to the first terminal device; or, the resource The indication information is carried in the fourth SCI, the fourth SCI is the second level SCI sent by the communication unit 1002 to the first terminal device, and the fourth SCI is indicated by the third SCI.
  • the third SCI further includes second indication information, and the second indication information is used to indicate that the third SCI includes the resource indication information, or indicate that the fourth SCI Includes the resource indication information.
  • the second indication information is carried in reserved bits in the third SCI.
  • the resource indication information is carried in a field used for resource allocation in the third SCI.
  • the processing unit 1001 is configured to determine at least one resource set, and the at least one resource set is used for the first The terminal device selects a side resource; the communication unit 1002 is configured to send resource indication information to the first terminal device, and the resource indication information is used to indicate the at least one resource set.
  • the communication unit 1002 is also used to receive enabling information from a network device; the enabling information is used to enable the second terminal device to determine the location of the first terminal device. Describes at least one resource collection.
  • the at least one resource set includes N side row resources; or, the at least one resource set includes periodic N side row resources, and N is a positive integer.
  • the processing unit 1001 is further configured to determine that the CBR is less than or equal to the CBR threshold before determining at least one resource set.
  • the resource indication information is further used to indicate the priority and/or threshold associated with the at least one resource set, and the priority associated with the resource set is a reference priority used to determine the resource set. Level, the threshold associated with the resource set is a reference threshold for determining the resource set.
  • the priority and/or threshold associated with the at least one resource set is configured through signaling; the signaling is RRC signaling or MAC signaling from a network device, or from PC5RRC signaling of the first terminal device.
  • the resource indication information is further used to indicate the use priority associated with the at least one resource set; the use priority associated with the at least one resource set is used to indicate the first terminal device The order in which the at least one resource set is used in order to select the side row resources.
  • the resource indication information includes index information of the at least one resource set, and the index information is used to indicate a resource reservation period of the corresponding resource set.
  • the processing unit 1001 is further configured to determine configuration information; the configuration information includes the corresponding relationship between the index information and the resource reservation period.
  • the communication unit 1002 is further configured to receive configuration information from a network device; the configuration information includes a one-to-one correspondence between M2 index information and M2 resource reservation periods, and M2 is greater than Or equal to 2.
  • the configuration information further includes a resource pool identifier, and the corresponding relationship between the index information and the resource reservation period is associated with the resource pool corresponding to the resource pool identifier.
  • the communication unit 1002 is used to receive resource indication information from the second terminal device; the resource indication information is used to Indicate at least one resource set; the processing unit 1001 is configured to select a side resource from the at least one resource set according to the resource indication information.
  • the at least one resource set includes N side row resources; or, the at least one resource set includes periodic N side row resources, and N is a positive integer.
  • the resource indication information is further used to indicate the priority and/or threshold associated with the at least one resource set, and the priority associated with the resource set is a reference priority used to determine the resource set. Level, the threshold associated with the resource set is a reference threshold for determining the resource set.
  • the priority associated with the first terminal device is higher than the priority associated with the resource set to which the side row resource belongs, and/or the threshold associated with the first terminal device is greater than the The threshold associated with the resource collection to which the side-row resource belongs.
  • the method further includes: the communication unit 1002 is further configured to send PC5RRC signaling to the second terminal device; the PC5RRC signaling includes information associated with the first terminal device Priority and/or threshold.
  • the resource indication information is further used to indicate the use priority associated with the at least one resource set; the use priority associated with the at least one resource set is used to indicate the first terminal device The order in which the at least one resource set is used in order to select the side row resources.
  • the resource indication information includes index information of the at least one resource set, and the index information is used to indicate a resource reservation period of the corresponding resource set.
  • the processing unit 1001 is further configured to determine configuration information; the configuration information includes the corresponding relationship between the index information and the resource reservation period.
  • the communication unit 1002 is further configured to receive configuration information from a network device; the configuration information includes a one-to-one correspondence between M2 index information and M2 resource reservation periods, and M2 is greater than Or equal to 2.
  • the configuration information further includes a resource pool identifier, and the corresponding relationship between the index information and the resource reservation period is associated with the resource pool corresponding to the resource pool identifier.
  • the communication unit 1002 is further configured to send side-line information through the side-line resource.
  • the device shown in FIG. 11 may be a hardware circuit implementation of the device shown in FIG. 10.
  • the communication device can be applied to the flowchart shown in FIG. 6 or FIG. 8 to perform the functions of the first terminal device or the second terminal device in the foregoing method embodiment.
  • FIG. 11 only shows the main components of the communication device.
  • the apparatus 1100 shown in FIG. 11 includes at least one processor 1120, configured to implement any one of the methods in FIG. 6 or FIG. 8 provided in the embodiment of the present application.
  • the device 1100 may further include at least one memory 1130 for storing program instructions and/or data.
  • the memory 1130 and the processor 1120 are coupled.
  • the coupling in the embodiments of the present application is an indirect coupling or communication connection between devices, units or modules, and may be in electrical, mechanical or other forms, and is used for information exchange between devices, units or modules.
  • the processor 1120 may operate in cooperation with the memory 1130.
  • the processor 1120 may execute program instructions stored in the memory 1130. At least one of the at least one memory may be included in the processor.
  • each step of the above method can be completed by an integrated logic circuit of hardware in the processor or instructions in the form of software.
  • the steps of the method disclosed in the embodiments of the present application may be directly embodied as being executed and completed by a hardware processor, or executed and completed by a combination of hardware and software modules in the processor.
  • the software module can be located in a mature storage medium in the field, such as random access memory, flash memory, read-only memory, programmable read-only memory, or electrically erasable programmable memory, registers.
  • the storage medium is located in the memory, and the processor reads the information in the memory and completes the steps of the above method in combination with its hardware. In order to avoid repetition, it will not be described in detail here.
  • the processor in the embodiment of the present application may be an integrated circuit chip with signal processing capability.
  • the steps of the foregoing method embodiments can be completed by hardware integrated logic circuits in the processor or instructions in the form of software.
  • the above-mentioned processor may be a general-purpose processor, a digital signal processing circuit (digital signal processor, DSP), a dedicated integrated circuit (application specific integrated circuit, ASIC), a field programmable gate array (field programmable gate array, FPGA) or other Programming logic devices, discrete gates or transistor logic devices, discrete hardware components.
  • DSP digital signal processing circuit
  • ASIC application specific integrated circuit
  • FPGA field programmable gate array
  • Programming logic devices discrete gates or transistor logic devices, discrete hardware components.
  • the general-purpose processor may be a microprocessor or the processor may also be any conventional processor or the like.
  • the steps of the method disclosed in the embodiments of the present application may be directly embodied as being executed and completed by a hardware decoding processor, or executed and completed by a combination of hardware and software modules in the decoding processor.
  • the software module can be located in a mature storage medium in the field, such as random access memory, flash memory, read-only memory, programmable read-only memory, or electrically erasable programmable memory, registers.
  • the storage medium is located in the memory, and the processor reads the information in the memory and completes the steps of the above method in combination with its hardware.
  • the memory in the embodiments of the present application may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memory.
  • the non-volatile memory can be a read-only memory (ROM), a programmable read-only memory (programmable ROM, PROM), an erasable programmable read-only memory (erasable PROM, EPROM), a Erase programmable read-only memory (electrically EPROM, EEPROM) or flash memory.
  • the volatile memory may be random access memory (RAM), which is used as an external cache.
  • RAM random access memory
  • static random access memory static random access memory
  • dynamic RAM dynamic RAM
  • DRAM dynamic random access memory
  • synchronous dynamic random access memory synchronous DRAM, SDRAM
  • double data rate synchronous dynamic random access memory double data rate SDRAM, DDR SDRAM
  • enhanced synchronous dynamic random access memory enhanced SDRAM, ESDRAM
  • synchronous connection dynamic random access memory serial DRAM, SLDRAM
  • direct rambus RAM direct rambus RAM
  • the apparatus 1100 may further include a communication interface 1110 for communicating with other devices through a transmission medium, so that the apparatus used in the apparatus 1100 can communicate with other devices.
  • the communication interface may be a transceiver, a circuit, a bus, a module, or other types of communication interfaces.
  • the transceiver when the communication interface is a transceiver, the transceiver may include an independent receiver and an independent transmitter; it may also be a transceiver with integrated transceiver functions, or an interface circuit.
  • the device 1100 may also include a communication line 1140.
  • the communication interface 1110, the processor 1120, and the memory 1130 may be connected to each other through a communication line 1140;
  • the communication line 1140 may be a peripheral component interconnect (PCI) bus or an extended industry standard architecture (extended industry standard architecture). , Referred to as EISA) bus and so on.
  • the communication line 1140 can be divided into an address bus, a data bus, a control bus, and the like. For ease of presentation, only one thick line is used to represent in FIG. 11, but it does not mean that there is only one bus or one type of bus.
  • the present application provides a communication system that includes the first terminal device and the second terminal device in the method embodiment of FIG. 6 or the first terminal device in the method embodiment of FIG. 8 Equipment and second terminal equipment.
  • the present application provides a computer-readable storage medium in which a computer program or instruction is stored.
  • the communication device executes the above-mentioned FIG. 6 Or the function of the first terminal device or the function of the second terminal device in the method embodiment in FIG. 8.
  • the present application provides a computer program product
  • the computer program product includes a computer program or instruction
  • the communication device causes the communication device to execute the above-mentioned FIG. 6 or FIG. 8
  • this application can be provided as a method, a system, or a computer program product. Therefore, this application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, this application may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, optical storage, etc.) containing computer-usable program codes.

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Abstract

一种通信方法及装置，可以应用于D2D或车联网，例如V2X、LTE-V等，或可以用于智能驾驶，智能网联车等领域，其中，方法包括：第一终端设备向第二终端设备发送索引信息，索引信息用于指示资源选择参数，第二终端设备根据索引信息指示的资源选择参数选择侧行资源，并向第一终端设备发送资源指示信息，第一终端设备接收第二终端设备的资源指示信息，根据资源指示信息指示的侧行资源发送侧行数据。通过第二终端设备辅助第一终端设备从资源池中检测资源，避免隐藏节点问题，有助于提升检测出可用资源的准确率。且第一终端设备向第二终端设备发送索引信息，最小化第一终端设备和第二终端设备之间的信令开销。

Description

一种通信方法及装置
相关申请的交叉引用
本申请要求在2020年06月24日提交中国专利局、申请号为202010589936.8、申请名称为“一种通信方法及装置”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及通信技术领域，尤其涉及一种通信方法及装置。
背景技术
在设备到设备通信(device to device，D2D)中，侧行资源是用于设备之间通信的资源。侧行资源的选择方法有两种，一种是模式一(mode1)，由基站为侧行链路分配侧行资源，另一种是模式二(mode2)，由发送侧的终端设备从资源池中检测出可用资源，该可用资源可以是资源池中受干扰较小或者不受干扰的资源，发送侧的终端设备基于检测出的可用资源确定侧行链路控制信息(sidelink control information，SCI)，将SCI发送至接收侧的终端设备来进行资源预留。
在模式二中，发送侧的终端设备针对某个资源检测时，由于发送侧的终端设备和某个终端设备(可以称为第三方终端设备)的距离较远，对于发送侧的终端设备来说，该第三方终端设备可能为隐藏节点，发送侧的终端设备并未检测到该资源被该第三方终端设备占用，且将该资源确定为可用资源。
基于此，发送侧的终端设备检测出的可用资源的准确率较低。
发明内容
本申请提供一种通信方法及装置，有助于提升检测出的可用资源的准确率。
第一方面，本申请提供一种通信方法，该方法可由第一终端设备执行，该方法包括：第一终端设备向第二终端设备发送索引信息，所述索引信息用于指示资源选择参数，所述资源选择参数用于为所述第一终端设备选择侧行资源；所述第一终端设备接收来自所述第二终端设备的资源指示信息，所述资源指示信息用于指示所述侧行资源。
上述技术方案中，通过第二终端设备辅助第一终端设备从资源池中检测资源，避免隐藏节点问题(hidden terminal problem，HTP)，有助于提升检测出的可用资源的准确率。进一步的，第一终端设备向第二终端设备发送索引信息，第二终端设备根据索引信息指示的资源选择参数，从资源池中选择侧行资源，最小化第一终端设备和第二终端设备之间的信令开销。
在一种可能的实现方式中，所述资源选择参数包括下述至少一项：资源预留周期、优先级、初始阈值、阈值提升次数、最大阈值、资源检测相关时长、数据量、包时延预算。
上述技术方案中，第二终端设备基于索引信息，确定资源选择参数，有助于第二终端设备在资源池中检测出符合第一终端设备需求的侧行资源。并且通过索引信息来指示资源 选择参数，资源选择参数可以包括一个或多个参数，有助于减少通知资源选择参数的信令开销。
在一种可能的实现方式中，所述索引信息承载于第一SCI，所述第一SCI是所述第一终端设备向所述第二终端设备发送的第一级SCI；或，所述索引信息承载于第二SCI，所述第二SCI是所述第一终端设备向所述第二终端设备发送的第二级SCI，所述第二SCI由所述第一SCI指示。
上述技术方案中，第一终端设备将索引信息承载于第一SCI(第一级SCI)中，可以在没有第二级SCI，只有第一级SCI的情形中，向第二终端设备有效传递索引信息，指示第二终端设备基于索引信息对应的资源选择参数，辅助第一终端设备在资源池中检测资源。第一终端设备将索引信息承载于第二SCI(第二级SCI)中，由于第二级SCI承载于物理侧行链路共享信道(physical sidelink share channel，PSSCH)，有助于降低对负载的要求。
在一种可能的实现方式中，所述第一SCI还包括第一指示信息，所述第一指示信息用于指示所述第一SCI中包括所述索引信息，或指示所述第二SCI中包括所述索引信息。上述技术方案中，第二终端设备在接收到第一SCI后，可以从第一SCI中确定第一指示信息，并基于第一指示信息确定第一SCI或第二SCI中是否存在索引信息，若是，则可以快速从第一SCI或第二SCI中获得索引信息。
在一种可能的实现方式中，所述第一指示信息承载于所述第一SCI中的预留比特位。
上述技术方案中，将第一指示信息承载于第一SCI中的预留比特位，对第一SCI的其余字段可以实现最小化修改。
在一种可能的实现方式中，所述第一SCI中格式字段指示所述第二SCI的第一格式时，所述第二SCI中的预留比特位承载所述索引信息；或，所述第一SCI中格式字段指示所述第一格式时，所述第二SCI中的预留比特位承载所述索引信息和所述第二终端设备的标识；和/或，所述第一SCI中格式字段指示所述第二SCI的第二格式时，所述第二SCI由所述索引信息、所述第一终端设备的标识和所述第二终端设备的标识组成。
上述技术方案中，第二终端设备在接收到第一SCI后，可以根据第一SCI的格式字段确定第二SCI所采用的格式，进而确定第二SCI中是否存在索引信息，以及索引信息承载于第二SCI中的哪些比特位，从而第二终端设备可以快速获得索引信息。进一步的，第二SCI所包含的源标识(第一终端设备的标识)可以包含更多的比特位，可以更加准确地标识通信的源终端，从而在进行反馈时能更加准确地标识该通信的目的终端，同理，第二SCI所包含的目的标识(第二终端设备的标识)可以包含更多的比特位，可以更加准确地标识该通信的目的终端。
在一种可能的实现方式中，还包括：所述第一终端设备确定配置信息，所述配置信息中包括所述索引信息和所述资源选择参数的对应关系。
在一种可能的实现方式中，所述第一终端设备接收来自网络设备的配置信息；所述配置信息中包括M1个对应关系，每个对应关系为一个索引和一个或一组资源选择参数的对应关系，M1大于或等于2。其中，资源选择参数可以是以下参数中的一项或多项的组合：资源预留周期、优先级、初始阈值、阈值提升次数、最大阈值、资源检测相关时长、数据量、包时延预算。
在一种可能的实现方式中，所述配置信息还包括资源池标识，所述索引信息与所述资源选择参数的对应关系关联于所述资源池标识对应的资源池。
上述技术方案中，网络设备基于每个资源池确定配置信息，具有针对性。
在一种可能的实现方式中，所述资源指示信息承载于第三SCI，所述第三SCI是所述第一终端设备从所述第二终端设备接收的第一级SCI；或，所述资源指示信息承载于第四SCI，所述第四SCI是所述第一终端设备从所述第二终端设备接收的第二级SCI，所述第四SCI由所述第三SCI指示。
上述技术方案中，第二终端设备将资源指示信息承载于第三SCI(第一级SCI)中，可以在没有第二级SCI，只有第一级SCI的情形中，向第一终端设备有效传递资源指示信息，指示第一终端设备基于资源指示信息选择侧行资源。第一终端设备将资源指示信息承载于第四SCI(第二级SCI)中，由于第二级SCI承载于PSSCH，有助于降低对负载的要求。
在一种可能的实现方式中，所述第三SCI还包括第二指示信息，所述第二指示信息用于指示所述第三SCI中包括所述资源指示信息，或指示所述第四SCI中包括所述资源指示信息。上述技术方案中，第一终端设备在接收到第三SCI后，可以从第三SCI中确定第二指示信息，并基于第二指示信息确定第三SCI或第四SCI中是否存在资源指示信息，若是，则从第三SCI或第四SCI中获得资源指示信息。
在一种可能的实现方式中，所述第二指示信息承载于所述第三SCI中的预留比特位。
上述技术方案中，将第二指示信息承载于第三SCI中的预留比特位，对第三SCI的其余字段可以实现最小化修改。
在一种可能的实现方式中，所述资源指示信息承载于所述第三SCI中的用于资源分配的字段。
上述技术方案中，第一终端设备可以从第三SCI中的用于资源分配的字段中快速获得资源指示信息。
在一种可能的实现方式中，所述第一终端设备接收来自所述第二终端设备的资源指示信息之后，还包括：所述第一终端设备通过所述侧行资源发送侧行信息。
第二方面，本申请提供一种通信方法，该方法可由第二终端设备执行，该方法包括：第二终端设备接收来自第一终端设备的索引信息；所述第二终端设备根据所述索引信息指示的资源选择参数，选择侧行资源；所述第二终端设备向所述第一终端设备发送资源指示信息，所述资源指示信息用于指示所述侧行资源。
上述技术方案中，通过第二终端设备辅助第一终端设备从资源池中检测资源，避免隐藏节点问题，有助于提升检测出的可用资源的准确率。进一步的，第一终端设备向第二终端设备发送索引信息，第二终端设备根据索引信息指示的资源选择参数，从资源池中选择侧行资源，最小化第一终端设备和第二终端设备之间的信令开销。
在一种可能的实现方式中，所述侧行资源用于所述第一终端设备发送侧行信息。
在一种可能的实现方式中，所述资源选择参数包括下述至少一项：资源预留周期、优先级、初始阈值、阈值提升次数、最大阈值、资源检测相关时长、数据量、包时延预算。
上述技术方案中，第二终端设备基于索引信息，确定资源选择参数，有助于第二终端设备在资源池中检测出符合第一终端设备需求的侧行资源。并且通过索引信息来指示资源选择参数，资源选择参数可以包括一个或多个参数，有助于减少通知资源选择参数的信令开销。
在一种可能的实现方式中，所述索引信息承载于第一SCI，所述第一SCI是所述第二 终端设备从所述第一终端设备接收的第一级SCI；或，所述索引信息承载于第二SCI，所述第二SCI是所述第二终端设备从所述第一终端设备接收的第二级SCI，所述第二SCI由所述第一SCI指示。
上述技术方案中，第一终端设备将索引信息承载于第一SCI(第一级SCI)中，可以在没有第二级SCI，只有第一级SCI的情形中，向第二终端设备有效传递索引信息，指示第二终端设备基于索引信息对应的资源选择参数，辅助第一终端设备在资源池中检测资源。第一终端设备将索引信息承载于第二SCI(第二级SCI)中，由于第二级SCI承载于PSSCH，有助于降低对负载的要求。
在一种可能的实现方式中，所述第一SCI还包括第一指示信息，所述第一指示信息用于指示所述第一SCI中包括所述索引信息，或指示所述第二SCI中包括所述索引信息。上述技术方案中，第二终端设备在接收到第一SCI后，可以从第一SCI中确定第一指示信息，并基于第一指示信息确定第一SCI或第二SCI中是否存在索引信息，若是，则可以快速从第一SCI或第二SCI中获得索引信息。
在一种可能的实现方式中，所述第一指示信息承载于所述第一SCI中的预留比特位。
上述技术方案中，将第一指示信息承载于第一SCI中的预留比特位，对第一SCI的其余字段可以实现最小化修改。
在一种可能的实现方式中，所述第一SCI中格式字段指示所述第二SCI的第一格式时，所述第二SCI中的预留比特位承载所述索引信息；或，所述第一SCI中格式字段指示所述第一格式时，所述第二SCI中的预留比特位承载所述索引信息和所述第二终端设备的标识；和/或，所述第一SCI中格式字段指示所述第二SCI的第二格式时，所述第二SCI由所述索引信息、所述第一终端设备的标识和所述第二终端设备的标识组成。
上述技术方案中，第二终端设备在接收到第一SCI后，可以根据第一SCI的格式字段确定第二SCI所采用的格式，进而确定第二SCI中是否存在索引信息，以及索引信息承载于第二SCI中的哪些比特位，从而第二终端设备可以快速获得索引信息。进一步的，第二SCI所包含的源标识(第一终端设备的标识)可以包含更多的比特位，可以更加准确地标识通信的源终端，从而在进行反馈时能更加准确地标识该通信的目的终端，同理，第二SCI所包含的目的标识(第二终端设备的标识)可以包含更多的比特位，可以更加准确地标识该通信的目的终端。
在一种可能的实现方式中，还包括：所述第二终端设备确定配置信息；所述配置信息中包括所述索引信息和所述资源选择参数的对应关系。
在一种可能的实现方式中，所述第一终端设备接收来自网络设备的配置信息；所述配置信息中包括M1个对应关系，每个对应关系为一个索引和一个或一组资源选择参数的对应关系，M1大于或等于2。其中资源选择参数可以是以下参数中的一项或多项的组合：资源预留周期、优先级、初始阈值、阈值提升次数、资源检测相关时长、最大阈值、数据量、包时延预算。
在一种可能的实现方式中，所述配置信息中包括资源池标识，所述索引信息和所述资源选择参数的对应关系关联于所述资源池标识对应的资源池。
上述技术方案中，网络设备基于每个资源池确定配置信息，具有针对性。
在一种可能的实现方式中，所述资源指示信息承载于第三SCI，所述第三SCI是所述第二终端设备向所述第一终端设备发送的第一级SCI；或，所述资源指示信息承载于第四 SCI，所述第四SCI是所述第二终端设备向所述第一终端设备发送的第二级SCI，所述第四SCI由所述第三SCI指示。
上述技术方案中，第二终端设备将资源指示信息承载于第三SCI(第一级SCI)中，可以在没有第二级SCI，只有第一级SCI的情形中，向第一终端设备有效传递资源指示信息，指示第一终端设备基于资源指示信息选择侧行资源。第一终端设备将资源指示信息承载于第四SCI(第二级SCI)中，由于第二级SCI位于PSSCH，有助于降低对负载的要求。
在一种可能的实现方式中，所述第三SCI还包括第二指示信息，所述第二指示信息用于指示所述第三SCI中包括所述资源指示信息，或指示所述第四SCI中包括所述资源指示信息。上述技术方案中，第一终端设备在接收到第三SCI后，可以从第三SCI中确定第二指示信息，并基于第二指示信息确定第三SCI或第四SCI中是否存在资源指示信息，若是，则从第三SCI或第四SCI中获得资源指示信息。
在一种可能的实现方式中，所述第二指示信息承载于所述第三SCI中的预留比特位。
上述技术方案中，将第二指示信息承载于第三SCI中的预留比特位，对第三SCI的其余字段可以实现最小化修改。
在一种可能的实现方式中，所述资源指示信息承载于所述第三SCI中的用于资源分配的字段。
上述技术方案中，第一终端设备可以从第三SCI中的用于资源分配的字段中快速获得资源指示信息。
第三方面，本申请提供一种通信方法，该方法可由第二终端设备执行，该方法包括：第二终端设备确定至少一个资源集合，所述至少一个资源集合用于所述第一终端设备选择侧行资源；所述第二终端设备向所述第一终端设备发送资源指示信息，所述资源指示信息用于指示所述至少一个资源集合。
上述技术方案中，第二终端设备主动辅助第一终端设备从资源池中检测至少一个资源集合，避免隐藏节点问题，有助于提升检测出的可用资源的准确率。进一步的，第一终端设备无需向第二终端设备发送资源选择参数，最小化第一终端设备和第二终端设备之间的信令开销。
在一种可能的实现方式中，所述方法还包括：所述第二终端设备接收来自网络设备的使能信息；所述使能信息用于使能所述第二终端设备为所述第一终端设备确定所述至少一个资源集合。
在一种可能的实现方式中，所述至少一个资源集合包括N个侧行资源；或，所述至少一个资源集合包括周期性的N个侧行资源，N为正整数。
在一种可能的实现方式中，所述第二终端设备确定至少一个资源集合之前，还包括：所述第二终端设备确定信道忙碌率(channel busy ratio，CBR)小于或等于CBR阈值。
上述技术方案中，通过CBR判断资源池中资源的使用情况，避免在资源拥塞情况下，因第二终端设备辅助第一终端设备检测资源产生信令交互，进一步影响通信性能。
在一种可能的实现方式中，所述资源指示信息还用于指示所述至少一个资源集合关联的优先级和/或阈值，资源集合关联的优先级为用于确定所述资源集合的参考优先级，资源集合关联的阈值为用于确定所述资源集合的参考阈值。
上述技术方案中，资源指示信息还用于指示至少一个资源集合关联的优先级和/或阈值，有助于第一终端设备从至少一个资源集合中选择侧行资源。
在一种可能的实现方式中，所述至少一个资源集合关联的优先级和/或阈值是通过信令配置的；所述信令是来自网络设备的无线资源控制(radio resource control，RRC)信令或媒介接入控制(medium access control，MAC)信令，或是来自所述第一终端设备的PC5RRC信令。
在一种可能的实现方式中，所述资源指示信息还用于指示所述至少一个资源集合关联的使用优先级；所述至少一个资源集合关联的使用优先级用于指示所述第一终端设备依次使用所述至少一个资源集合选择侧行资源的顺序。
上述技术方案中，资源指示信息还用于指示至少一个资源集合关联的使用优先级，第一终端设备可以按照使用优先级顺序，从高到低，依次从各资源集合中选择侧行资源。
在一种可能的实现方式中，所述资源指示信息中包括所述至少一个资源集合的索引信息，索引信息用于指示对应资源集合的资源预留周期。
在一种可能的实现方式中，还包括：所述第二终端设备确定配置信息；所述配置信息包括索引信息和资源预留周期的对应关系。
在一种可能的实现方式中，所述第二终端设备接收来自网络设备的配置信息；所述配置信息中包括M2个索引信息和M2个资源预留周期的一一对应关系，M2大于或等于2。
在一种可能的实现方式中，所述配置信息还包括资源池标识，所述索引信息和资源预留周期的对应关系关联于所述资源池标识对应的资源池。
上述技术方案中，网络设备基于每个资源池确定配置信息，具有针对性。
第四方面，本申请提供一种通信方法，该方法可由第一终端设备执行，该方法包括：第一终端设备接收来自第二终端设备的资源指示信息；所述资源指示信息用于指示至少一个资源集合；所述第一终端设备根据所述资源指示信息，从所述至少一个资源集合中选择侧行资源。
上述技术方案中，第二终端设备主动辅助第一终端设备从资源池中检测至少一个资源集合，避免隐藏节点问题，有助于提升检测出可用资源的准确率。进一步的，第一终端设备无需向第二终端设备发送资源选择参数，最小化第一终端设备和第二终端设备之间的信令开销。
在一种可能的实现方式中，所述至少一个资源集合包括N个侧行资源；或，所述至少一个资源集合包括周期性的N个侧行资源，N为正整数。
在一种可能的实现方式中，所述资源指示信息还用于指示所述至少一个资源集合关联的优先级和/或阈值，资源集合关联的优先级为用于确定所述资源集合的参考优先级，资源集合关联的阈值为用于确定所述资源集合的参考阈值。
上述技术方案中，资源指示信息还用于指示至少一个资源集合关联的优先级和/或阈值，有助于第一终端设备从至少一个资源集合中选择侧行资源。
在一种可能的实现方式中，所述第一终端设备关联的优先级高于所述侧行资源所属资源集合关联的优先级，和/或，所述第一终端设备关联的阈值高于所述侧行资源所属资源集合关联的阈值。
上述技术方案中，第一终端设备根据自身关联的优先级和/或阈值，以及至少一个资源集合关联的优先级和/或阈值，从至少一个资源集合中选择侧行资源。
在一种可能的实现方式中，所述方法还包括：所述第一终端设备向所述第二终端设备发送PC5RRC信令；所述PC5RRC信令中包括所述第一终端设备关联的优先级和/或阈值。
在一种可能的实现方式中，所述资源指示信息还用于指示所述至少一个资源集合关联的使用优先级；所述至少一个资源集合关联的使用优先级用于指示所述第一终端设备依次使用所述至少一个资源集合选择侧行资源的顺序。
上述技术方案中，资源指示信息还用于指示至少一个资源集合关联的使用优先级，第一终端设备可以按照使用优先级顺序，从高到低，依次从各资源集合中选择侧行资源。
在一种可能的实现方式中，所述资源指示信息中包括所述至少一个资源集合的索引信息，索引信息用于指示对应资源集合的资源预留周期。
在一种可能的实现方式中，还包括：所述第一终端设备确定配置信息；所述配置信息包括索引信息和资源预留周期的对应关系。
在一种可能的实现方式中，所述第一终端设备接收来自网络设备的配置信息；所述配置信息中包括M2个索引信息和M2个资源预留周期的一一对应关系，M2大于或等于2。
在一种可能的实现方式中，所述配置信息还包括资源池标识，所述索引信息和资源预留周期的对应关系关联于所述资源池标识对应的资源池。
上述技术方案中，网络设备基于每个资源池确定配置信息，具有针对性。
在一种可能的实现方式中，所述第一终端设备从所述至少一个资源集合中选择侧行资源之后，还包括：通过所述侧行资源发送侧行信息。
第五方面，本申请实施例提供一种通信装置，该装置可以是终端设备，还可以是用于终端设备的芯片。该装置具有实现上述第一方面至第四方面任意方面中各实现方法的功能。该功能可以通过硬件实现，也可以通过硬件执行相应的软件实现。该硬件或软件包括一个或多个与上述功能相对应的模块。
第六方面，本申请实施例提供一种通信装置，包括处理器和存储器；该存储器用于存储计算机执行指令，当该装置运行时，该处理器执行该存储器存储的该计算机执行指令，以使该装置执行如上述第一方面至第四方面任意方面中的各实现方法。
第七方面，本申请实施例提供一种通信装置，包括处理器和通信接口，所述通信接口用于接收来自所述通信装置之外的其它通信装置的信号并传输至所述处理器或将来自所述处理器的信号发送给所述通信装置之外的其它通信装置，所述处理器通过逻辑电路或执行代码指令用于实现上述第一方面至第四方面任意方面中的各实现方法。
第八方面，本申请实施例提供一种通信装置，包括用于执行上述第一方面至第四方面任意方面中的各实现方法中各个步骤的单元或手段(means)。
第九方面，本申请实施例提供一种通信装置，包括处理器，用于与存储器相连，用于调用所述存储器中存储的程序，以执行上述第一方面至第四方面任意方面中的各实现方法。该存储器可以位于该装置之内，也可以位于该装置之外。且该处理器包括一个或多个。
第十方面，本申请实施例还提供一种计算机可读存储介质，所述计算机可读存储介质中存储有指令，当其在计算机上运行时，使得计算机执行上述第一方面至第四方面任意方面中的各实现方法。
第十一方面，本申请实施例还提供一种计算机程序产品，该计算机产品包括计算机程序，当计算机程序运行时，使得上述第一方面至第四方面任意方面中的各实现方法被执行。
第十二方面，本申请实施例还提供一种芯片系统，包括：处理器，用于执行上述第一方面至第四方面任意方面中的各实现方法。
第十三方面，本申请实施例还提供一种通信系统，包括上述第一方面的第一终端设备 和上述第二方面的第二终端设备，或上述第三方面的第二终端设备和上述第四方面的第一终端设备。
附图说明
图1为本申请提供的一种无线通信系统网络架构的示意图；
图2为本申请提供的一种PPPP和阈值的对应关系；
图3为本申请提供的一种预留侧行资源的示意图；
图4为本申请提供的另一种无线通信系统的示意图；
图5为本申请提供的一种资源检测与选择的示意图；
图6为本申请提供的一种通信方法的流程示意图；
图7为本申请提供的一种索引信息与资源选择参数的对应关系的示意图；
图8为本申请提供的另一种通信方法的流程示意图；
图9为本申请提供的一种索引信息与资源预留周期的对应关系的示意图；
图10为本申请提供的一种通信装置的结构示意图；
图11为本申请提供的另一种通信装置的结构示意图。
具体实施方式
为了使本申请实施例的目的、技术方案和优点更加清楚，下面将结合附图对本申请实施例作进一步地详细描述。
以下，对本申请实施例中的部分用语进行解释说明，以便于本领域技术人员理解。
1)终端设备
终端设备是向用户提供语音和/或数据连通性的设备，例如可以包括具有无线连接功能的手持式设备、或连接到无线调制解调器的处理设备。该设备可以经无线接入网(radio access network，RAN)与核心网进行通信，与RAN交换语音和/或数据。该设备可以包括用户设备(user equipment，UE)、无线终端设备、移动终端设备、订户单元(subscriber unit)、订户站(subscriber station)，移动站(mobile station)、移动台(mobile)、远程站(remote station)、接入点(access point，AP)、远程终端设备(remote terminal)、接入终端设备(access terminal)、用户终端设备(user terminal)、用户代理(user agent)、或用户装备(user device)等。例如，可以包括移动电话(或称为“蜂窝”电话)，具有移动终端设备的计算机，便携式、袖珍式、手持式、计算机内置的移动装置，智能穿戴式设备等。例如，个人通信业务(personal communication service，PCS)电话、无绳电话、会话发起协议(session initiation protocol，SIP)话机、无线本地环路(wireless local loop，WLL)站、个人数字助理(personal digital assistant，PDA)、等设备。还包括受限设备，例如功耗较低的设备，或存储能力有限的设备，或计算能力有限的设备等。例如包括条码、射频识别(radio frequency identification，RFID)、传感器、全球定位系统(global positioning system，GPS)、激光扫描器等信息传感设备。
2)网络设备
网络设备包括接入网(access network，AN)设备，例如基站(例如，接入点)，可以是指接入网中在空口通过一个或多个小区与无线终端设备通信的设备。基站可用于将收到 的空中帧与网际协议(IP)分组进行相互转换，作为终端设备与接入网的其余部分之间的路由器，其中接入网的其余部分可包括IP网络。网络设备还可协调对空口的属性管理。例如，网络设备可以包括长期演进(long term evolution，LTE)系统或演进的LTE系统(LTE-Advanced，LTE-A)中的演进型基站(NodeB或eNB或e-NodeB，evolutional Node B)，或者也可以包括5G NR系统中的下一代节点B(next generation node B，gNB)或者也可以包括云接入网(cloud radio access network，CloudRAN)系统中的集中式单元(centralized unit，CU)和分布式单元(distributed unit，DU)，本申请实施例并不限定。
3)侧行链路(sidelink)资源
侧行资源也可以称为侧行链路资源，或资源，或传输资源。本申请中，侧行链路也可以称之为边链路，或者旁链路，或者PC5接口链路，或者终端设备间链路。
在D2D通信中，侧行资源是用于终端设备和终端设备之间的通信的资源。侧行资源可以包括频域的侧行资源和时域的侧行资源。本申请主要讨论关于时域的侧行资源，在非特指情况下，后续出现的侧行资源均可以指时域的侧行资源，这里做统一说明。
从传输类型角度，侧行资源可以包括侧行链路发送资源和侧行链路接收资源。其中，侧行链路发送资源用于发送信息，如发送控制信息和/或数据。侧行链路接收资源用于接收信息，如接收控制信息和/或数据。
4)两级SCI
两级SCI包括第一级SCI和第二级SCI，其中，第一级SCI承载于物理侧行链路控制信道(physical sidelink control channel，PSCCH)中，第二级SCI承载于PSSCH中，第一级SCI与第二级SCI相关联，或者说，第一级SCI指示第二级SCI。
第一级SCI中字段包括优先级(priority)、频域资源分配(frequency resource assignment)、时域资源分配(time resource assignment)、资源预留周期(resource reservation period)、解调参考信号(demodulation reference signal，DMRS)模式、第二级SCI格式(2 nd-stage SCI format)、偏移量指示(beta_offset indicator)、调制编码方式表格(modulation and coding scheme table，MCS table)、预留字段(reserve)等。
其中，偏移量指示关联于第二级SCI所占用的资源(如资源单元(resource element，RE)。或者说，可以通过偏移量指示计算第二级SCI所占用的资源，如RE个数。
第二级SCI的格式由第一级SCI指示，示例性的，第二级SCI中字段包括HARQ进程标识(HARQ process ID)、新传指示(new data indicator，NDI)、冗余版本(redundancy version，RV)、源ID(source ID)、目标ID(destination ID)、CSI请求(CSI request)等。
两级SCI也可以称之为两阶SCI。第一级SCI也可以称之为第一阶SCI，第二级SCI也可以称之为第二阶SCI。
本申请中，“…字段”也可以称之为“…比特位”或“……占用的比特位”或“……对应的比特位”。比如，优先级字段也可以称之为优先级比特位，或优先级占用的比特位，或优先级对应的比特位。再比如，频域资源分配字段也可以称之为频域资源分配比特位，或频域资源分配占用的比特位，或频域资源分配字段对应的比特位。
5)其它
本申请实施例中的术语“系统”和“网络”可被互换使用。“至少一个”是指一个或者多个，“多个”是指两个或两个以上。“和/或”，描述关联对象的关联关系，表示可以存在三种关系，例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B的情况，其中A， B可以是单数或者复数。字符“/”一般表示前后关联对象是一种“或”的关系。“以下至少一项(个)”或其类似表达，是指的这些项中的任意组合，包括单项(个)或复数项(个)的任意组合。例如，a，b，或c中的至少一项(个)，可以表示：a，b，c，a-b，a-c，b-c，或a-b-c，其中a，b，c可以是单个，也可以是多个。
以及，除非有相反的说明，本申请实施例提及“第一”、“第二”等序数词是用于对多个对象进行区分，不用于限定多个对象的顺序、时序、优先级或者重要程度。例如，第一值和第二值，只是为了区分不同的取值，而并不是表示这两个取值的内容、优先级或者重要程度等的不同。
请参见图1，为本申请实施例提供的一种无线通信系统网络架构的示意图。无线通信系统包括网络设备和多个终端设备。示例性的，如图1中，无线通信系统可以包括网络设备、终端设备1、终端设备2，这两个终端设备可以均与网络设备连接，或者这两个终端设备中可以只有终端设备1与网络设备连接，终端设备2不与网络设备连接，这两个终端设备之间也可以通过侧行链路进行通信，也就是终端设备1是有网络覆盖的终端设备，终端设备2是部分网络覆盖的终端设备。
图1以只有终端设备1与网络设备连接为例。当然图1中的终端设备的数量只是举例，在实际应用中，网络设备可以为多个终端设备提供服务。
图1中的网络设备例如为接入网设备，例如基站。其中，接入网设备在不同的系统对应不同的设备，例如在第四代移动通信技术(the 4th generation，4G)系统中可以对应eNB,在5G系统中对应5G中的接入网设备，例如gNB。
其中，图1中的终端设备是以UE为例，但本申请实施例中的终端设备不限于此。
在网络设备与终端设备1进行通信时，网络设备可作为发送端，终端设备1可作为接收端；或者，网络设备可作为接收端，终端设备1可作为发送端。
示例性的，终端设备1可以通过网络设备调度的上行资源，向网络设备发送上行数据，其中，该上行资源是由网络设备通过上行控制信息调度的。终端设备1还可以通过网络设备调度的下行资源，接收来自网络设备的下行数据，其中，该下行资源是由网络设备通过下行控制信息调度的。
在终端设备1与终端设备2进行通信时，终端设备1以及终端设备2之间可进行侧行通信。其中，终端设备1可作为发送端，终端设备2可作为接收端。或者，终端设备2可作为发送端，终端设备1可作为接收端。
示例性的，终端设备1与终端设备2之间通过侧行资源传输数据。侧行资源的选择方法有两种：
模式一是集中控制式的方法，中心控制设备(例如基站或中继站等)将资源通过调度的方式分配给发送侧的终端设备使用。
模式二是基于竞争的分布式资源复用方法，由发送侧的终端设备通过竞争的方式从资源池中获得可用资源，此处，资源池是由基站分出的一整块资源，各终端设备在这整块资源中竞争不受干扰或受干扰程度较小的小块资源，该小块资源即可称为是可用资源。发送侧的终端设备基于检测出的可用资源确定SCI，并将SCI发送至接收侧的终端设备，以进行资源预留。
如图2为本申请实施例提供的一种单个包优先级(prose per-packet priority，PPPP)和阈值(threshold)的对应关系。参照图2说明，发送侧的终端设备在资源池中竞争资源时， 需要检测该资源上的SCI中并解读对应的PPPP，以及资源具体位置，并且根据自身PPPP(如图2中纵列上终端设备的PPPP)与被检测到的资源上的其它终端设备的PPPP(如图2中横列上其它终端设备的PPPP)确定相应的阈值(如图2中横列与纵列交叉处的阈值)，如果被检测到的资源满足对应的阈值，比如说，在该资源上检测到的信号强度值小于该阈值，则确定该资源为可用资源，否则确定该资源为不可用资源。
例如，发送侧的终端设备对应PPPP5，其它终端设备对应PPPP4，则确定阈值为TH36，若资源的信号强度值不高于TH36，则确定该资源为可用资源。
这里以PPPP作为示例，PPPP值越低，业务的优先级或数据的优先级越高。也可以理解为，优先级值越低，相应的数据的优先级越高，或者说，优先级值越低，相应的逻辑信道的优先级越高。
信号强度值可以理解为参考信号接收功率(reference signal received power，RSRP)、接收信号强度(received signal strength indication，RSSI)或信号与干扰加噪声比(signal to interference and noise ratio，SINR)。相应的，在资源检测时，若测量资源的RSRP，则阈值为RSRP阈值；若测量资源的RSSI，则阈值为RSSI阈值；若测量资源的SINR，则阈值为SINR阈值。
本申请中，在探测/检测资源中，初始阈值用于比较信号强度来判断/确定资源是否为可用资源，也可以将初始阈值称之为阈值(threshold)。
本申请中，竞争资源又可以称为是检测资源、探测资源、选择资源、感应(sensing)资源或确定资源。
在模式二中，发送侧的终端设备每发送一次SCI，可以预留最多N个资源(N为正整数)，并且同一个SCI中预留的资源是用于传输同一个传输块(transmission block，TB)；或者，同一个SCI中预留的资源也可以是第一个资源到第X个资源用于传输一个传输块，第X+1个资源到第N个资源用于传输另一个传输块，其中X为大于等于1且小于等于N的正整数，以此类推，不再一一枚举。
可选的，N为3或者为大于3的任何一个整数。
可选的，SCI中还可以携带资源预留周期，一个SCI中预留的N个资源可以以该资源预留周期进行重复预留。
需要说明的是，不同资源预留周期内预留的资源用于传输不同的传输块。例如，第一个资源预留周期内的N个资源用于传输传输块1，第二个资源预留周期内的N个资源用于传输传输块2，第三个资源预留周期内的N个资源用于传输传输块3，以此类推。
如图3所示为预留的侧行资源示意图。在每个资源预留周期内存在三块预留的侧行资源，在第一个资源预留周期内预留的侧行资源用于传输传输块1，在第二个资源预留周期内预留的侧行资源用于传输传输块2。需要说明的是，每个资源预留周期内预留的所有侧行资源要求限定在一个时间窗内，也即预留的侧行资源不能超出时间窗。
本申请中，资源预留周期，也可以称之为预留资源周期，或预留周期，或资源周期。
本申请中，传输块也可以称之为数据包(data packet)。
在模式二中，发送侧的终端设备在检测资源时，可能存在隐藏节点问题，解释为，发送侧的终端设备在资源池中检测资源时，对于某个资源，由于发送侧的终端设备和某个终端设备(可以称为第三方终端设备)的距离较远，发送侧的终端设备可能并未检测到该资源正在被该第三方终端设备占用，且将该资源确定为可用资源。基于此，发送侧的终端设 备检测出的可用资源的准确率较低。
参照如图4示出一种无线通信系统，该无线通信系统中终端设备A、终端设备B、终端设备C、终端设备D共享资源池。终端设备A通过资源1向终端设备B发送数据，当终端设备C需要向终端设备B发送数据时，终端设备C在资源池中检测资源，由于终端设备C与终端设备A的距离较远，终端设备C并未检测到资源1正在被终端设备A占用，则对于终端设备C来说，终端设备A为隐藏节点，终端设备C将资源1作为可用资源。也即，终端设备C错误将资源1确定为可用资源。
基于上述问题，提供一种由辅助终端设备执行资源检测的方法，辅助终端设备可以理解成接收侧的终端设备，或接收侧的终端设备附近的终端设备。该辅助终端设备与发送侧的终端设备共享一个资源池，由辅助终端设备对资源池中的资源进行检测，可以避免隐藏节点问题，有助于提升检测出的可用资源的准确率。
例如图4中，终端设备C可以选择终端设备B或终端设备D作为辅助终端设备，示例性的，终端设备D辅助终端设备C检测资源，并将检测到的可用资源的资源指示信息发送至终端设备C，终端设备C根据该资源指示信息确定资源池中的可用资源。
在辅助终端设备辅助发送侧的终端设备在资源池中检测资源时，发送侧的终端设备需要将资源检测所对应的资源选择参数发送至辅助终端设备，从而辅助终端设备基于资源选择参数，在资源池中辅助发送侧的终端设备检测资源。
其中，资源选择参数也可以称之为业务特征参数，或业务特征，或资源特征，或特征信息。资源选择参数包括优先级(priority)、初始阈值、阈值提升次数、最大阈值、数据特征(traffic feature)、数据量、资源检测窗、资源检测相关时长、包时延预算(packet delay budge，PDB)、资源预留周期中至少一项或多项。
其中，优先级可以是PPPP或业务质量(quality of service，QoS)优先级，或者任何表征待传输数据级别的标识。阈值可以是与信号强度值相关的阈值，比如，RSRP阈值、RSSI阈值或SINR等。根据优先级和/阈值检测资源的实现方式可参照如图2所示实施例。
进一步的，可以先根据优先级和初始阈值检测资源，若检测出的可用资源的比例小于或等于预设比例，则可以按照预设偏移量提升阈值，并根据提升后的阈值进一步检测可用资源。阈值提升次数为提升阈值的最大次数，也可以理解为最大提升次数，或者最大允许的阈值提升次数等；最大阈值为提升阈值后阈值的最大值，在基于提升阈值检测资源时，提升后的阈值不能超过最大阈值。换言之，初始阈值、阈值提升次数与最大阈值之间的关系为，将初始阈值按照预设偏移量提升阈值提升次数之后，得到的提升后阈值小于或等于最大阈值。其中，预设偏移量是网络设备通过RRC信令配置或者预先设定的一个值。
数据量可以包括缓冲状态报告(buffer status report，BSR)和/或资源所需子载波(subchannel)数。
数据特征包括数据周期，或者数据是周期的还是非周期的。
资源检测相关时长可以包括第一时长、第二时长、第三时长、第四时长、第五时长中的至少一个或多个的组合。具体的，第一时长为终端设备完成资源检测和选择过程所需要的时长，第二时长为终端设备识别候选资源和选择用于侧行链路传输的资源所需要的时长，第三时长为终端设备对于反馈信息的处理时延时长，第四时长为终端设备的资源选择窗相对于资源检测窗的延时时长，或者说资源选择窗的起始时刻相对于资源检测窗的终结时刻的时延时长/滞后时间/滞后时长，第五时长为终端设备完成SCI解码/解析的时长，或者终 端设备完成SCI解码/解析并且进行RSRP/RSSI测量的时长。
可选的，终端设备识别候选资源和选择用于侧行链路传输的资源所需要的时长可以为终端设备识别候选资源和选择用于潜在的侧行链路传输的资源集合所需要的时长。
可选的，RSRP测量为在资源检测过程中对于DMRS的RSRP测量。可选的，RSSI测量为在资源检测过程中对于侧行链路能量的测量。
如图5所示，为本申请示例性提供的一种资源检测与选择示意图。作为一个示例，上述第一时长可以是图5中的T3，上述第二时长可以是图5中的T proc,1，上述第四时长可以是图5中的T1，上述第五时长可以是图5中的T proc,0。
可选的，上述这些参数是辅助终端设备的参数，辅助终端设备获取预先配置的这些参数，辅助终端设备根据这些参数或基于这些参数进行资源检测和/或资源选择。其中，获取可以理解为确定。预先配置可以是缺省定义的值，或者由网络设备通过RRC信令发送给辅助终端设备的。
发送侧的终端设备将资源选择参数发送至辅助终端设备时，会产生大量的信令开销。
为降低发送侧的终端设备与辅助终端设备之间的信令开销，本申请实施例提供一种通信方法，该方法可由两个终端设备执行，这两个终端设备例如为第一终端设备和第二终端设备。此外，该方法还可以由能够支持终端设备实现该方法所需的功能的通信装置执行，通信装置例如芯片系统。
示例性的，如图1中，第一终端设备是终端设备1，第二终端设备是终端设备2，终端设备2辅助终端设备1在资源池中检测资源；或，第一终端设备是终端设备2，第二终端设备是终端设备1，终端设备1辅助终端设备2在资源池中检测资源。
本申请实施例提供一种通信方法，具体可参照如图6示出的流程图。
步骤601，第一终端设备向第二终端设备发送索引信息。
相应的，所述第二终端设备接收来自所述第一终端设备的索引信息。
第一终端设备和第三终端设备建立侧行链路连接，第一终端设备作为发送侧的终端设备，第三终端设备作为接收侧的终端设备。当第一终端设备需要向第三终端设备发送侧行信息时，可以触发第二终端设备辅助第一终端设备在资源池中检测资源。
此处，第二终端设备可以是第三终端设备，也可以是第三终端设备附近且共享该资源池的终端设备。当第二终端设备是第三终端设备附近且共享该资源池的终端设备时，第一终端设备和第二终端设备也需要建立侧行链路连接。
可选的，第二终端设备位于第三终端设备附近，且第二终端设备的周边干扰情形与第三终端设备的周边干扰情形近似。
如下为本申请实施例提供的一种可能的确定第二终端设备的方法：
第一终端设备若确定第二终端设备满足预设条件，则可以将第二终端设备作为辅助终端设备。其中，第二终端设备满足预设条件可以为：第二终端设备的第一参数大于或等于第一预设值；或者，第二终端设备的第二参数小于或等于第二预设值。其中，第一参数与信道质量关联，第二参数与反馈信息关联。
进一步的，该信道质量可以是第一终端设备与第二终端设备之间信道的质量。该反馈信息可以是第一组播组中的反馈信息。所述第二终端设备包括在第一组播组中。反馈信息包括肯定确认(acknowledgement，ACK)和否定确认(not-acknowledgement，NACK)。
基于组播(groupcast)的反馈方式有两种：
第一种反馈方式中，接收端反馈NACK。即接收端不反馈ACK，接收端在接收不正确时，在共有的反馈资源上反馈NACK。
第二种反馈方式中，接收端既可以反馈ACK，也可以反馈NACK。即接收端接收正确时，在发送端和接收端的反馈资源上反馈ACK，接收端接收不正确时，在发送端和接收端的反馈资源上反馈NACK。
可选的，第一预设值或第二预设值为网络设备或第一终端设备配置的。例如，第一预设值或第二预设值是网络设备通过RRC信令配置的。又例如，第一预设值或第二预设值是第一终端设备通过SCI配置的。可以理解的，若RRC信令或SCI中第一预设值或第二预设值为缺省值时，可以表示不需要第二终端设备辅助检测可用资源。
可选的，如果有多个资源池，第一预设值或第二预设值可以是对应资源池配置的。即如果有多个资源池，网络设备或第一终端设备可以针对不同的资源池进行相应的第一预设值或第二预设值的配置。
可选的，第一预设值与CBR关联。示例性的，第一CBR大于第二CBR时，第一CBR对应的第一预设值小于第二CBR对应的第一预设值。
可选的，第二预设值与CBR关联。示例性的，第一CBR大于第二CBR时，第一CBR对应的第二预设值大于第二CBR对应的第二预设值。
可以理解的，第一预设值和第二预设值可以相同也可以不同。
下面分别介绍第一参数和第二参数。其中，第一参数可以为如下情况1至情况4中任一个，第二参数可以为如下情况5或情况6。
情况1：第一参数为预设时间段内，第一终端设备测量的信道状态信息(channel state information，CSI)测量结果；或者，第一参数为预设时间段内，第二终端设备测量的CSI测量结果，其中，第二终端设备测量的CSI测量结果被第二终端设备反馈给第一终端设备。
其中，CSI测量结果为第一终端设备和第二终端设备之间的CSI的测量结果。CSI测量结果用于指示第一终端设备和第二终端设备之间的信道质量。示例性的，第一CSI测量结果大于第二CSI测量结果，第一CSI测量结果指示的信道质量比第二CSI测量结果指示的信道质量好。
情况2：第一参数为预设时间段内，第一终端设备基于第二终端设备发送的参考信号测量的RSRP；或者，第一参数为预设时间段内，第二终端设备基于第一终端设备发送的参考信号测量的RSRP。
其中，RSRP可以反映第一终端设备与第二终端设备的信道质量。示例性的，第一RSRP大于第二RSRP，第一RSRP对应的信道质量比第二RSRP对应的信道质量好。
情况3：第一参数为预设时间段内，第一终端设备基于第二终端设备发送的信号测量的RSSI；或者，第一参数为预设时间段内，第二终端设备基于第一终端设备发送的信号测量的RSSI。
其中，RSSI可以反映第一终端设备与第二终端设备的信道质量。示例性的，第一RSSI大于第二RSSI，第一RSSI对应的信道质量比第二RSSI对应的信道质量好。
情况4：第一参数为预设时间段内，第一终端设备基于第二终端设备发送的参考信号测量的参考信号接收质量(reference signal received quality，RSRQ)；或者，第一参数为预设时间段内，第二终端设备基于第一终端设备发送的参考信号测量的RSRQ。
其中，RSRQ可以反映第一终端设备与第二终端设备的信道质量。示例性的，第一RSRQ 大于第二RSRQ，第一RSRQ对应的信道质量比第二RSRQ对应的信道质量好。
情况5：第二参数为预设时间段内，第一终端设备向第二终端设备发送的反馈信息中ACK所占的百分比；或者，第二参数为预设时间段内，第一终端设备接收来自第二终端设备的反馈信息中ACK所占的百分比。
其中，该反馈信息可以是基于上述第二种反馈方式发送的反馈信息。ACK所占的百分比可以反映第一终端设备与第二终端设备之间的信道质量。ACK所占的百分比1大于ACK所占的百分比2，ACK所占的百分比1对应的信道质量比ACK所占的百分比2对应的信道质量好。
情况6：第二参数为预设时间段内，第一终端设备向第一组播组的终端设备发送的反馈信息中NACK所占的百分比；或者，第二参数为预设时间段内，第一终端设备接收来自第一组播组的终端设备的反馈信息中NACK所占的百分比。
其中，该反馈信息可以是基于上述第一种反馈方式发送的反馈信息。NACK所占的百分比可以反映第一终端设备与第二终端设备之间的信道质量。示例性的，NACK所占的百分比1大于NACK所占的百分比2，NACK所占的百分比2对应的信道质量比NACK所占的百分比1对应的信道质量好。
需要说明的是，上述情况1至情况6中的预设时间段可以相同也可以不同。
可以理解的，通过上述实现方式中所述的方法，可以选择出通信质量较好的终端设备作为第二终端设备，这样第二终端设备检测出的可用资源更为准确。第一终端设备采用第二终端设备检测出的可用资源传输侧行信息时，通信质量较高。
步骤602，第二终端设备根据索引信息指示的资源选择参数，选择侧行资源。
理解为，第二终端设备选择的侧行资源为用于第一终端设备发送侧行信息的资源，也即，第二终端设备根据索引信息指示的资源选择参数为第一终端设备选择侧行资源。第二终端设备选择的侧行资源又可以称为是辅助资源或可用资源或空闲资源或免于隐藏节点干扰的侧行资源。
第二终端设备根据资源选择参数，选择侧行资源，具体可以为，第二终端设备根据资源选择参数，从资源池中检测或探测并选择资源，并从检测或探测并选择出的资源中为第一终端设备确定侧行资源。也可以理解，第二终端设备为第一终端设备检测或探测并选择的资源为满足资源选择参数的资源。
本申请中，可以将索引信息称为是第一索引信息或参数索引信息。在步骤602中，以索引信息称为是第一索引信息为例说明。第二终端设备确定第一索引信息，根据第一索引信息确定第一索引信息指示的资源选择参数，然后根据第一索引信息指示的资源选择参数从资源池中辅助第一终端设备选择资源。
下面，先对第二终端设备确定第一索引信息说明。
可选的，第一索引信息可承载于第一终端设备向第二终端设备发送的SCI或媒体接入控制层的控制单元(medium access control control element，MAC CE)中。
一种实现方式中，第一索引信息承载于第一终端设备向第二终端设备发送的SCI中。相应的，第二终端设备接收到该SCI之后，从该SCI中获取第一索引信息，并根据第一索引信息确定资源选择参数，进而根据资源选择参数辅助第一终端设备从资源池中检测资源。
第一索引信息可承载于第一终端设备向第二终端设备发送的两级SCI的第一级SCI中，可以将该第一级SCI称之为第一SCI。
第一索引信息也可承载于第一终端设备向第二终端设备发送的两级SCI的第二级SCI中，可以将该第二级SCI称之为第二SCI。第二SCI关联于第一SCI，具体的，第一SCI指示第二SCI的格式，或者，第一SCI指示第二SCI中是否携带有第一索引信息，或者，第一SCI指示第二SCI中携带有第一索引信息。
可选的，当第一索引信息承载于第二SCI时，所述第二SCI的格式不同于现有第二SCI的格式。即，第一SCI中指示的第二SCI的格式为新引入的格式。
下面，说明第一索引信息分别承载于第一SCI或第二SCI的实现方式。
一、第一索引信息承载于第一SCI中。
第一索引信息承载于第一SCI中的一种实现方式中，第一索引信息承载于第一SCI中的预留比特位和/或非预留比特位。
非预留比特位可理解为第一SCI中除预留比特位以外的比特位，比如，第一SCI中优先级对应的比特位、频域资源分配对应的比特位、时域资源分配对应的比特位、资源预留周期对应的比特位、调制编码方式表格对应的比特位、或DMRS模式/DMRS图案对应的比特位。
举例1，第一索引信息承载于第一SCI中的x个预留比特位。可选的，x为2或3。
举例2，第一索引信息承载于第一SCI中资源预留周期对应的x个比特位。
需要说明的是，第一索引信息承载于第一SCI中的非预留比特位，可理解为，第一索引信息复用现有第一级SCI中非预留比特位。进一步的，虽然第一SCI中可能保留现有第一级SCI中某些字段，但这些字段不再指示原有信息，第一SCI也不再用于资源预留。
本申请中，复用也可以理解为占用。
举个例子，第一索引信息复用现有第一级SCI中优先级对应的比特位，则优先级对应的比特位用于指示第一索引信息。进一步的，可以设置其他字段，比如频域资源分配、时域资源分配、资源预留周期等，为无效(invalid)字段。
此说明同样适用于下述第一SCI中第一索引信息复用现有第一级SCI中非预留比特位，或第二SCI中第一索引信息复用现有第二级SCI中非预留比特位的实施例中。
本申请实施例中，第二终端设备在接收到来自第一终端设备的第一SCI时，可以从第一SCI中获得第一索引信息，并根据第一索引信息确定资源选择参数，进而根据资源选择参数辅助第一终端设备从资源池中检测资源。
第一索引信息承载于第一SCI中的另一种实现方式中，第一SCI中包括第一索引信息和第一指示信息，第一指示信息用于指示第一SCI中包括第一索引信息。
在第一种可选设计中，第一索引信息承载于第一SCI中的非预留比特位，第一指示信息承载于第一SCI中的预留比特位。第二终端设备从预留比特位中解析出第一指示信息时，也即第二终端设备解析出预留比特位的含义为指示辅助资源选择时，第二终端设备可以从对应的非预留比特位解析出第一索引信息。在该设计中，将第一指示信息承载于第一SCI中的预留比特位，对第一SCI的其余字段可以实现最小化修改。
比如，第一指示信息承载于第一SCI中的1个预留比特位，第一索引信息承载于第一SCI中资源预留周期对应的x个比特位。
可选的，第一指示信息可以是取值为1或0。第一种可选设计中，第一指示信息取值为1，指示第一SCI中承载有第一索引信息；第一指示信息取值为0，指示第一SCI中未承载有第一索引信息。第二种可选设计中，第一指示信息取值为0，指示第一SCI中承载 有第一索引信息；第一指示信息取值为1，指示第一SCI中未承载有第一索引信息。
在第二种可选设计中，第一索引信息承载于第一SCI中的预留比特位，第一指示信息承载于第一SCI中的非预留比特位。第二终端设备从非预留比特位中解析出第一指示信息时，也即第二终端设备解析出非预留比特位的含义为指示辅助资源选择时，第二终端设备可以从对应的预留比特位解析出第一索引信息。
例如，第一索引信息承载于第一SCI中的x个预留比特位。第一指示信息承载于第一SCI中格式字段对应的1个比特位，也即，第一指示信息复用第一SCI中第二SCI级格式字段(以下简称格式字段)。当第一SCI中格式字段不同于现有的格式字段时，可以确定该第一SCI用于指示辅助资源选择。
本申请实施例中，第二终端设备在接收到第一SCI时，可以根据第一指示信息从第一SCI中获得第一索引信息。具体的，第二终端设备若确定第一指示信息指示第一SCI中承载有第一索引信息，则从第一SCI中获得第一索引信息；并根据第一索引信息确定资源选择参数，进而根据资源选择参数辅助第一终端设备从资源池中检测资源。
第一终端设备将第一索引信息承载于第一SCI(第一级SCI)中，可以在没有第二级SCI，只有第一级SCI的情形中，向第二终端设备有效传递第一索引信息，指示第二终端设备基于第一索引信息对应的资源选择参数，辅助第一终端设备在资源池中检测资源。
二、第一索引信息承载于第二SCI中。
本申请中，第二SCI与第一SCI相关联，第一SCI指示第二SCI。具体的，第一SCI指示第二SCI的格式，或者，第一SCI指示第二SCI中是否携带有第一索引信息，或者，第一SCI指示第二SCI中携带有第一索引信息。
第一SCI可以分以下至少两种方式指示第一索引信息承载于第二SCI中。
指示方式一，第一SCI中第一指示信息指示第一索引信息承载于第二SCI中。
第一SCI中包括第一指示信息，第一指示信息用于指示第二SCI中包括第一索引信息。具体的，第一SCI中第一指示信息承载于第一SCI中的预留比特位，第二SCI中第一索引信息承载于第二SCI中预留比特位和/或非预留比特位。
示例性的，第一指示信息承载于第一SCI中的1个预留比特位，第一索引信息承载于第二SCI中HARQ进程标识对应的比特位、新传指示对应的比特位、冗余版本对应的比特位、源ID对应的比特位、目标ID对应的比特位、CSI请求对应的比特位中任一个或多个。
可选的，第一指示信息可以是取值为1或0。第一种可选设计中，第一指示信息取值为1，指示第二SCI中承载有第一索引信息；第一指示信息取值为0，指示第二SCI中未承载有第一索引信息。第二种可选设计中，第一指示信息取值为0，指示第二SCI中承载有第一索引信息；第一指示信息取值为1，指示第二SCI中未承载有第一索引信息。
第二终端设备在接收到第一SCI之后，可以根据第一指示信息确定第二SCI中承载有第一索引信息，然后接收第二SCI，从第二SCI中获得第一索引信息。具体的，第二终端设备若确定第一指示信息指示第二SCI中承载有第一索引信息，则接收第二SCI，并从第二SCI中获得第一索引信息；第二终端设备根据第一索引信息确定资源选择参数，进而根据资源选择参数辅助第一终端设备从资源池中检测资源。
指示方式二，第一SCI中格式字段指示第一索引信息承载于第二SCI中。
第一SCI中格式字段指示第二SCI采用第一格式和/或第二格式，分别如下述说明。
第一SCI中格式字段指示第二SCI为第一格式，可以有三种可选设计。
在第一种可选设计中，第一格式的第二SCI中新增第一索引信息，该第一索引信息承载于第二SCI中预留比特位。相应的，第二终端设备在接收到第一SCI之后，若确定第一SCI中格式字段指示第二SCI为第一格式，则接收第二SCI，从第二SCI中预留比特位获得第一索引信息。
在第二种可选设计中，第一格式的第二SCI中新增第一索引信息和第二终端设备的标识，该第一索引信息和第二终端设备的标识均承载于第二SCI中预留比特位。相应的，第二终端设备在接收到第一SCI之后，若确定第一SCI中格式字段指示第二SCI为第一格式，且第二终端设备确定接收的第二SCI中预留比特位包括第二终端设备的标识，则从第二SCI中预留比特位获得第一索引信息。
在第三种可选设计中，第一格式的第二SCI中新增第一索引信息、第一终端设备的标识和第二终端设备的标识，该第一索引信息、第一终端设备的标识和第二终端设备的标识均承载于第二SCI中预留比特位。相应的，第二终端设备在接收到第一SCI之后，若确定第一SCI中格式字段指示第二SCI为第一格式，且第二终端设备确定接收的第二SCI中预留比特位包括第一终端设备的标识和第二终端设备的标识，则从第二SCI中预留比特位获得第一索引信息。
需要说明的是，本申请中提到的标识可以是针对业务而言的，也可以是针对发送业务的终端设备而言的，还可以是既针对发送业务的终端设备，又针对业务而言的。
在常规技术中，当第一终端设备发送控制信息时，目的标识指的是，对于第一终端设备来说所传输的数据/业务相应的目的标识；源标识指的是与第一终端设备相关的标识，或者与第一终端设备的业务相关的标识。
本申请中，在第一终端设备发送的控制信息或MAC CE中，第一终端设备的标识为源标识，第二终端设备的标识为目的标识。在第二终端设备发送的控制信息或MAC CE中，第一终端设备的标识为目的标识，第二终端设备的标识为源标识。本申请中的目的标识为新引入的目的标识。本申请中的源标识为新引入的源标识。
在本申请中，第一终端设备发送控制信息或MAC CE时，新引入的目的标识为反馈辅助资源的终端设备的标识。例如，第一终端设备发送控制信息给第二终端，目的标识可以是第二终端设备相关的标识。例如，目的标识可以是第二终端设备的标识相关联的标识；目的标识可以是发给第二终端设备的业务相关联的标识；或者，目的标识可以是与第二终端设备的标识相关联的标识和发给第二终端设备的业务相关联的标识。相应地，当第一终端设备发送控制信息时，源标识指的是，与第一终端设备的标识相关联的标识，与第一终端设备所发送的业务相关联的标识，或者，与第一终端设备的标识相关联的标识和第一终端设备所发送的业务相关联的标识。
本申请中，新引入的源标识指的是，触发反馈辅助资源的源标识，或者请求反馈辅助资源的源标识，或者指示反馈辅助资源的源标识。可选的，新引入的源标识可以复用目前现有的源标识，或者可以是在现有的源标识基础上的扩展(具体扩展如下)。
本申请中，所传输的数据为泛指，即所传输的数据可以理解为所传输的信息。该信息可以为请求反馈信息，也可以为反馈信息。本申请中，辅助资源可以理解为可用资源。
需要说明的是，相比于常规技术中SCI 2-a或SCI 2-b中所包含的源标识，控制信息或MAC CE所包含的源标识可以包含更多的比特位。这样能更加准确地标识该通信源，从而在进行反馈时能更加准确地标识目的终端。同理，相比于常规技术中SCI 2-a或SCI 2-b中 所包含的目的标识，控制信息所包含的反馈可用资源的终端的标识可以包含更多的比特位。这样能更加准确地标识该通信目的终端。
示例性的，以常规技术中源标识包含8比特位为例，控制信息所包含的源标识包含的比特位可以扩展到12或16。
示例性的，以常规技术中的目的标识包含16比特位为例，控制信息所包含的反馈可用资源的终端的标识包含的比特位可以扩展到20或24。
基于对上述标识的说明，在第三种可选设计中，新增第一终端设备的标识和第二终端设备的标识，是为了指示第二终端设备辅助第一终端设备在资源池中检测资源。解释为，第一终端设备需要向第三终端设备发送侧行信息，但是指示第二终端设备辅助第一终端设备在资源池中检测资源，则会在第二SCI中携带两组标识：第一组标识为第一终端设备(发送侧的终端设备)的标识和第三终端设备(接收侧的终端设备)的标识，用于指示进行侧行传输的终端设备对。第二组标识为第一终端设备(主终端设备)的标识和第三终端设备(辅助终端设备)的标识，用于指示资源检测的终端设备对。
进一步的，又因为两组标识中都有第一终端设备的标识，则在第二种可选设计中，第二SCI只新增第二终端设备的标识和第一索引信息，也可以实现指示第二终端设备辅助第一终端设备在资源池中检测资源。
第一SCI中格式字段指示第二SCI为第二格式，第二格式的第二SCI由第一终端设备的标识、第二终端设备的标识和第一索引信息组成。
相应的，第二终端设备在接收到第一SCI之后，若确定第一SCI中格式字段指示第二SCI为第二格式，且第二终端设备确定接收的第二SCI中包括第一终端设备的标识和第二终端设备的标识，则从第二SCI中获得第一索引信息。
或者说，第二终端设备在接收到第一SCI之后，若确定第一SCI中格式字段指示第二SCI为第二格式，且第二终端设备根据第二SCI中所包含的第一终端设备的标识获知触发辅助资源选择的终端，以及根据第二SCI中所包含的第二终端设备的标识获知被触发进行辅助资源选择的终端。进而第二终端设备从第二SCI中获得第一索引信息。
应理解，本申请实施例中，第一SCI中格式字段指示第二SCI采用的第一格式和/或第二格式，实质上是新定义的第二级SCI的格式。也即，第二SCI实质上是新定义格式的第二级SCI。
新定义第二级SCI的第一格式中，相比于原有的第二级SCI，新增第一索引信息，或新增第一索引信息和第二终端设备的标识，或新增第一索引信息、第一终端设备的标识和第二终端设备的标识。本申请实施例中，具有新定义格式的第二级SCI可以表示为SCI 2-c。
新定义第二级SCI的第二格式中，将原有第二级SCI中所有字段删除，重新定义的第二级SCI由第一索引信息、第一终端设备的标识和第二终端设备的标识组成。进一步的，可以将新定义的第二级SCI称为是第三级SCI，该第三级SCI由第一级SCI指示。本申请实施例中，具有新定义格式的第二级SCI可以表示为SCI 2-d。
由于第二级SCI位于PSSCH，有助于降低对负载的要求。进一步的，第二终端设备在接收到第一SCI后，可以根据第一SCI的格式字段确定第二SCI所采用的格式，然后确定第二SCI中是否存在第一索引信息，以及第一索引信息承载于第二SCI中的哪些比特位，从而第二终端设备可以快速获得第一索引信息。
在步骤602中，第一索引信息指示资源选择参数，可以有如下理解：第一索引信息对 应资源选择参数，或第一索引信息对应第一终端设备的资源选择参数，或第一终端设备的第一索引信息对应第一终端设备的资源选择参数。“对应”可以替换成“关联于”。
可选的，资源选择参数包括资源预留周期、优先级、初始阈值、阈值提升次数、最大阈值、资源检测相关时长、数据量、包时延预算中至少一项或多项。
示例性的，资源选择参数为一个参数，比如优先级，或资源预留周期，或初始阈值等。或者，资源选择参数为两个参数，比如优先级和资源预留周期，或资源预留周期和初始阈值，或优先级和初始阈值等。或者，资源选择参数为三个参数，比如优先级、资源预留周期和初始阈值，或优先级、初始阈值和阈值提升次数。或者，资源选择参数为其他数量的参数，此处不再赘述。
第二终端设备在确定第一索引信息之后，可以基于第一索引信息确定第一索引信息指示的资源选择参数。
一种可选设计中，第一终端设备和第二终端设备中均配置有配置信息，该配置信息中包括M1个对应关系，每个对应关系为索引信息和资源选择参数的对应关系。资源选择参数可以包括以下参数中的一项或多项的组合：资源预留周期、优先级、初始阈值、阈值提升次数、资源检测相关时长、最大阈值、数据量、包时延预算中至少一项或多项。具体的，若资源选择参数包括上述中的1个参数，配置信息包括M1个索引信息和M1个资源选择参数的一一对应关系；若资源选择参数包括多个参数的组合，配置信息中包括M1个索引信息和M1组资源选择参数的一一对应关系，M1为正整数。第一索引信息是M1个索引信息中的一个。
在步骤602中，可以将该配置信息称为是第一配置信息，或参数配置信息。以配置信息称为是第一配置信息为例说明。
示例性，如图7为本申请提供的一种索引信息与资源选择参数的对应关系的示意图，索引信息1对应的资源选择参数为“优先级1、资源预留周期1ms、子载波数5”；索引信息2对应的资源选择参数为“优先级3、资源预留周期5ms、子载波数3”等。
第一终端设备在需要检测资源时，将第一索引信息发送至第二终端设备。相应的，第二终端设备在接收到第一索引信息之后，确定第一配置信息，并根据第一索引信息和第一配置信息中M1个对应关系，确定与第一索引信息对应的资源选择参数。
结合如图7举例，第一终端设备向第二终端设备发送索引信息1，第二终端设备在接收到索引信息1之后，确定第一配置信息，第一配置信息中包括如图7所示的M1个对应关系，第二终端设备根据索引信息1和M1个对应关系，确定索引信息1对应的资源选择参数为“优先级1、资源预留周期1ms、子载波数5”。
本申请实施例中，第一配置信息可以是协议规定的，或者是由网络设备配置的。
当第一配置信息是由网络设备配置时，一种可选实现方式中，网络设备将第一配置信息分别发送至第一终端设备和第二终端设备，相应的，第一终端设备接收来自网络设备的第一配置信息，确定M1个对应关系；第二终端设备接收来自网络设备的第一配置信息，确定M1个对应关系。
本申请实施例中，网络设备在向第一终端设备和第二终端设备发送第一配置信息时，可以是资源池粒度，或者是侧行链路粒度。具体有如下两种示例：
在第一种示例中，网络设备记录有当前所有资源池，以及每个资源池关联的终端设备。网络设备可以针对每个资源池，确定该资源池对应的配置信息，并将该资源池对应的配置 信息配置于该资源池所关联的终端设备。网络设备基于每个资源池确定配置信息，具有针对性。
具体实现中，网络设备将第一终端设备和第二终端设备所在资源池的资源池标识记录在该资源池对应的第一配置信息中，也可以说，第一配置信息中的资源池标识关联于第一配置信息中M1个对应关系，也即关联于第一索引信息与资源选择参数的对应关系，或者说，第一配置信息中索引信息与资源选择参数的对应关系关联于第一配置信息中资源池标识对应的资源池。可以理解为第一配置信息中索引信息与资源选择参数的对应关系应用于该资源池标识对应的资源池。
网络设备将第一配置信息分别发送至第一终端设备和第二终端设备，相应的，第一终端设备和第二终端设备分别根据该第一配置信息确定M1个对应关系。具体的，网络设备针对资源池中所有终端设备发送第一配置信息，从而该资源池中所有终端设备接收第一配置信息，并根据该第一配置信息确定M1个对应关系。或者，网络设备广播该第一配置信息，资源池中终端设备在接收到该第一配置信息后，确定第一配置信息中资源池标识与自身所在资源池的资源池标识一致，则根据该第一配置信息确定M1个对应关系。
在第二种示例中，网络设备可以针对与网络设备连接的所有终端设备配置该第一配置信息。具体实现中，网络设备将第一配置信息发送至与网络设备连接的所有终端设备，相应的，各终端设备接收第一配置信息，并根据该第一配置信息确定M1个对应关系。
示例性的，该第一配置信息可以是网络设备通过RRC信令、MAC层信令(例如，MAC CE)、物理层信令(例如，DCI或PDCCH)中的任一种或任多种配置/指示/发送的。
示例性的，步骤602的一种具体实现方式中，第一索引信息指示的资源选择参数中包括初始阈值、阈值提升次数、优先级、资源预留周期。第二终端设备根据资源选择参数选择侧行资源具体可以为，第二终端设备针对资源池中任一个资源，若资源选择参数中优先级大于已占用该资源的终端设备的优先级，且资源选择参数中初始阈值大于该资源上当前的信号强度值，则将该资源确定为可用资源，否则，将该资源确定为不可用资源。进一步的，第二终端设备还可以根据资源选择参数中资源预留周期从资源池中选择具有周期性的资源，比如，检测出以上述资源预留周期为周期的资源，每个资源预留周期中有N个资源。
可选的，第二终端设备根据优先级和初始阈值检测资源，若检测出的可用资源的比例小于或等于预设比例，则可以对初始阈值提升预设偏移量，得到提升后的阈值。第二终端设备再根据优先级和提升后的阈值，在资源池中检测资源，直至检测出的可用资源的比例大于预设比例。此处，第二终端设备提升阈值的提升次数不大于资源选择参数中阈值提升次数，若第二终端设备提升阈值的提升次数达到阈值提升次数时，仍不能检测出大于预设比例的可用资源，则第二终端设备确定资源检测失败。
此外，步骤602中第二终端设备根据第一索引信息指示的资源选择参数，选择侧行资源，具体也可参照现有技术中终端设备基于资源预留周期、优先级、初始阈值、阈值提升次数、资源检测相关时长、数据量、最大阈值、包时延预算中至少一项或多项，从资源池中检测资源的实现方式。此处不再赘述。
此外，第二终端设备还可以确定当前CBR或者信道占用率(channel utilization ratio,CR)，该当前CBR或当前CR作为第二终端设备确定是否辅助检测资源的条件。
示例性的，当第二终端设备接收来自第一终端设备的第一索引信息时，确定当前CBR是否小于或等于CBR阈值，若是，则辅助第一终端设备在资源池中检测资源；否则，不 辅助第一终端设备在资源池中检测资源。
示例性的，当第二终端设备接收来自第一终端设备的第一索引信息时，确定当前CR是否小于或等于CR阈值，若是，则辅助第一终端设备在资源池中检测资源；否则，不辅助第一终端设备在资源池中检测资源。
通过CBR或CR判断资源池中资源的使用情况，避免在资源拥塞情况下，因第二终端设备辅助第一终端设备检测资源产生信令交互，进一步影响通信性能。
步骤603，第二终端设备向第一终端设备发送资源指示信息。
相应的，第一终端设备接收来自所述第二终端设备的资源指示信息。
第二终端设备选择的侧行资源可用于第一终端设备发送侧行信息，该侧行信息包括侧行控制信息和/或侧行数据信息。第二终端设备可以确定用于指示侧行资源的资源指示信息，并将该资源指示信息发送至第一终端设备。
在步骤603中，第二终端设备将资源指示信息发送至第一终端设备时，资源指示信息可承载于第二终端设备向第一终端设备发送的MAC CE中，或承载于第二终端设备向第一终端设备发送的SCI中。
可选的，资源指示信息承载于第二终端设备向第一终端设备发送的MAC CE时，该MAC CE可以是在SCI调度的PSSCH中承载。
可选的，资源指示信息承载于第二终端设备向第一终端设备发送的SCI时，资源指示信息可以承载于第二终端设备向第一终端设备发送的两级SCI的第一级SCI中，可以将该第一级SCI称之为第三SCI。
资源指示信息也可以承载于第二终端设备向第一终端设备发送的两级SCI的第二级SCI中，可以将该第二级SCI称之为第四SCI，第四SCI关联于第三SCI，具体的，第三SCI指示第四SCI的格式，或者，第三SCI指示第四SCI中是否携带有资源指示信息，或者，第三SCI指示第四SCI中携带有资源指示信息。
下面，说明资源指示信息承载于第三SCI或第四SCI的实现方式。
一、资源指示信息承载于第三SCI中。
资源指示信息承载于第三SCI中的一种实现方式中，资源指示信息承载于第三SCI中的非预留比特位。非预留比特位可理解为第三SCI中除预留比特位以外的比特位，比如，第三SCI中优先级对应的比特位、频域资源分配对应的比特位、时域资源分配对应的比特位、资源预留周期对应的比特位、调制编码方式表格对应的比特位、或DMRS模式/DMRS图案对应的比特位。
一种可选实现方式中，资源指示信息承载于第三SCI中的用于资源分配的字段。具体的，频域资源指示信息承载于第三SCI中时域资源分配对应的比特位，时域资源指示信息承载于第三SCI中频域资源分配对应的比特位；或者，频域资源指示信息承载于第三SCI中频域资源分配对应的比特位，时域资源指示信息承载于第三SCI中时域资源分配对应的比特位；或者，频域资源指示信息和时域资源指示信息均承载于第三SCI中时域资源分配对应的比特位；或者，频域资源指示信息和时域资源指示信息均承载于第三SCI中频域资源分配对应的比特位。
需要说明的是，资源指示信息承载于第三SCI中的非预留比特位，可理解为，资源指示信息复用现有第一级SCI中非预留比特位。进一步的，虽然第三SCI中可能保留现有第一级SCI中某些字段，但这些字段不再指示原有信息，第三SCI也不再用于资源预留。
此说明同样适用于下述第三SCI中资源指示信息复用现有第一级SCI中非预留比特位，第四SCI中资源指示信息复用现有第二SCI级中非预留比特位的实施例。
本申请实施例中，第一终端设备在接收到来自第二终端设备的第三SCI时，可以从第三SCI中获得资源指示信息，并根据资源指示信息选择侧行资源，进而根据侧行资源发送侧行信息。
资源指示信息承载于第三SCI中的另一种实现方式中，第三SCI中包括资源指示信息和第二指示信息，第二指示信息用于指示第三SCI中包括资源指示信息。
在第一种可选设计中，资源指示信息承载于第三SCI中的非预留比特位，第二指示信息承载于第三SCI中的预留比特位。第一终端设备从预留比特位中解析出第二指示信息时，也即第一终端设备解析出预留比特位的含义为指示侧行资源时，第二终端设备可以从对应的非预留比特位解析出资源指示信息。在该设计中，将第二指示信息承载于第三SCI中的预留比特位，对第三SCI的其余字段可以实现最小化修改。
比如，第二指示信息承载于第三SCI中的1个预留比特位，资源指示信息承载于第三SCI中资源预留周期对应的x个比特位。
可选的，第二指示信息可以是取值为1或0。第一种可选设计中，第二指示信息取值为1，指示第三SCI中承载有资源指示信息；第二指示信息取值为0，指示第三SCI中未承载有资源指示信息。第二种可选设计中，第二指示信息取值为0，指示第三SCI中承载有资源指示信息；第二指示信息取值为1，指示第三SCI中未承载有资源指示信息。
第一终端设备在接收到第三SCI时，可以根据第二指示信息从第三SCI中获得资源指示信息。具体的，第一终端设备若确定第二指示信息指示第三SCI中承载有资源指示信息，则从第三SCI中非预留比特位获得资源指示信息；第一终端设备根据资源指示信息选择侧行资源，进而根据侧行资源发送侧行信息。
在第二种可选设计中，资源指示信息承载于第三SCI中的预留比特位，第二指示信息承载于第三SCI中的非预留比特位。第一终端设备从非预留比特位中解析出第二指示信息时，也即第一终端设备解析出非预留比特位的含义为指示侧行资源时，第一终端设备可以从对应的预留比特位解析出资源指示信息。
例如，资源指示信息承载于第三SCI中的x个预留比特位。第二指示信息承载于第一SCI中格式字段对应的1个比特位，也即，第二指示信息复用第三SCI中格式字段。当第三SCI中格式字段不同于现有格式字段时，可以确定该第三SCI用于指示侧行资源。
第二终端设备将资源指示信息承载于第三SCI(第一级SCI)中，可以在没有第二级SCI，只有第一级SCI的情形中，向第一终端设备有效传递资源指示信息，指示第一终端设备基于资源指示信息选择侧行资源。
二、资源指示信息承载于第四SCI中。
本申请中，第四SCI与第三SCI相关联，第三SCI指示第四SCI。具体的，第三SCI指示第四SCI的格式，或者，第三SCI指示第四SCI中是否携带有资源指示信息，或者，第三SCI指示第四SCI中携带有资源指示信息。
第三SCI可以分以下至少两种方式指示资源指示信息承载于第四SCI中。
指示方式一，第三SCI中第二指示信息指示资源指示信息承载于第四SCI中。
第三SCI中包括第二指示信息，第二指示信息用于指示第四SCI中包括资源指示信息。具体的，第三SCI中第二指示信息承载于第三SCI中的预留比特位，第四SCI中资源指示 信息承载于第四SCI中预留比特位和/或非预留比特位。
示例性的，第二指示信息承载于第三SCI中的1个预留比特位，资源指示信息承载于第四SCI中HARQ进程标识对应的比特位、新传指示对应的比特位、冗余版本对应的比特位、源ID对应的比特位、目标ID对应的比特位、CSI请求对应的比特位中任一个或多个。
可选的，第二指示信息可以是取值为1或0。第一种可选设计中，第二指示信息取值为1，指示第四SCI中承载有资源指示信息；第二指示信息取值为0，指示第四SCI中未承载有资源指示信息。第二种可选设计中，第二指示信息取值为0，指示第四SCI中承载有资源指示信息；第二指示信息取值为1，指示第四SCI中未承载有资源指示信息。
第二终端设备在接收到第三SCI之后，可以根据第二指示信息确定第四SCI中承载有资源指示信息，然后接收第四SCI，从第四SCI中获得资源指示信息。具体的，第一终端设备若确定第二指示信息指示第四SCI中承载有资源指示信息，则接收第四SCI，并从第四SCI中获得资源指示信息；第一终端设备根据资源指示信息选择侧行资源，进而根据侧行资源发送侧行信息。
指示方式二，第三SCI中格式字段指示资源指示信息承载于第四SCI中。
第三SCI中格式字段指示第四SCI采用第三格式，第三格式的第四SCI由第一终端设备的标识、第二终端设备的标识和资源指示信息组成。
相应的，第一终端设备在接收到第三SCI之后，若确定第三SCI中格式字段指示第四SCI为第三格式，且第一终端设备确定接收的第四SCI中包括第一终端设备的标识和第二终端设备的标识，则从第四SCI中获得资源指示信息。或者说，第一终端设备在接收到第三SCI之后，若确定第三SCI中格式字段指示第四SCI为第三格式，且根据第四SCI中所包含的第二终端设备的标识获知被触发进行辅助资源选择并反馈的终端，以及根据第四SCI中所包含的第一终端设备的标识获知触发进行辅助资源选择的终端。进而，第一终端设备从第四SCI中获得资源指示信息。
应理解，本申请实施例中，第三SCI中格式字段指示第四SCI采用的第三格式，实质上是新定义的第二级SCI的格式。也即，第四SCI实质上是新定义格式的第二级SCI。
新定义第二级SCI的第三格式中，将原有第二级SCI中所有字段删除，重新定义的第二级SCI由资源指示信息、第一终端设备的标识和第二终端设备的标识组成。进一步的，可以将新定义的第二级SCI称为是第四级SCI，该第四级SCI由第一级SCI指示。
或者，可以将新定义的第二级SCI称为是具有新定义格式的第二级SCI，该第二级SCI与第一级SCI相关联，且由第一级SCI中格式字段指示。具有新定义格式的第二级SCI可以表示为SCI 2-e。
本申请实施例中，由于第二级SCI位于PSSCH，有助于降低对负载的要求。
在步骤601至步骤603中，可以将承载有索引信息的SCI称为是触发SCI，该触发SCI用于触发第二终端设备辅助第一终端设备在资源池中检测资源。可以将承载有资源指示信息的SCI称为是反馈SCI或辅助SCI，该反馈SCI或辅助SCI用于指示第二终端设备在资源池中检测到的资源，也即用于指示第一终端设备发送侧行信息的侧行资源。
步骤604，第一终端设备通过侧行资源发送侧行信息。
第一终端设备接收来自第二终端设备的资源指示信息之后，可以根据资源指示信息选择侧行资源，并通过侧行资源发送侧行信息。侧行信息可以为侧行数据信息和/或侧行控制信息。
此处，第一终端设备根据资源指示信息选择侧行资源时，第一终端设备所选择的侧行资源可以是部分与资源指示信息所指示的侧行资源相同，或者是全部与资源指示信息所指示的侧行资源相同。
本申请实施例中，通过第二终端设备辅助第一终端设备从资源池中检测资源，避免隐藏节点问题，有助于提升检测出可用资源的准确率。进一步的，第一终端设备向第二终端设备发送索引信息，第二终端设备根据索引信息指示的资源选择参数，从资源池中选择侧行资源，通过索引信息来指示资源选择参数，资源选择参数可以包括一个或多个参数，有助于减少通知资源选择参数的信令开销。
本申请实施例还提供一种通信方法，具体可参照如图8示出的流程图。
步骤801，第二终端设备确定至少一个资源集合。
本申请实施例中，第二终端设备可以主动触发检测，即第二终端设备主动在资源池中检测出至少一个资源集合。其中，主动触发检测可以是基于来自网络设备的使能信息，该使能信息用于使能第二终端设备为第一终端设备确定至少一个资源集合。本申请中，使能信息也可以称之为触发信息，或激活信息。去使能信息也可以称之为去激活信息。
在第一种实现方式中，第二终端设备可以是基于优先级和阈值，从资源池中确定与优先级和阈值相关联的资源集合。示例性的，第二终端设备基于第一优先级和第一阈值，从资源池中确定与第一优先级和第一阈值相关联的第一资源集合，其中，对于第一资源集合中包括的任一个资源，其它终端设备在该资源上的优先级低于第一优先级，且该资源上的信号强度值小于或等于第一阈值。换言之，对于资源池中任一个资源，第二终端设备若确定其它终端设备在该资源上的优先级低于第一优先级，且该资源上的信号强度值小于或等于第一阈值，则将该资源确定为第一资源集合中的资源。
在第二种实现方式中，第二终端设备可以是基于优先级，从资源池中确定与优先级相关联的资源集合。示例性的，第二终端设备基于第一优先级，从资源池中确定与第一优先级相关联的第一资源集合，其中，对于第一资源集合中包括的任一个资源，其它终端设备在该资源上的优先级低于第一优先级。换言之，对于资源池中任一个资源，第二终端设备若确定其它终端设备在该资源上的优先级低于第一优先级，则将该资源确定为第一资源集合中的资源。
在第三种实现方式中，第二终端设备可以是基于阈值，从资源池中确定与阈值相关联的资源集合。示例性的，第二终端设备基于第一阈值，从资源池中确定与第一阈值相关联的第一资源集合，其中，对于第一资源集合中包括的任一个资源，该资源上的信号强度值小于或等于第一阈值。换言之，对于资源池中任一个资源，第二终端设备若确定该资源上的信号强度值小于或等于第一阈值，则将该资源确定为第一资源集合中的资源。
本申请中，第二终端设备可以是基于一一对应的K个优先级和K个阈值，或K个优先级，或K个阈值，从资源池中确定K个资源集合，其中，K为正整数。
具体的，在第一种实现方式中，第二终端设备可以是基于K个优先级和K个阈值，从资源池中确定K个资源集合。其中，第k个优先级高于第k+1个优先级，且第k个阈值低于第k+1个阈值，k为正整数且小于K。第二终端设备先确定与第1个优先级和第1个阈值相关联的第1个资源集合，然后确定与第2个优先级和第2个阈值相关联的第2个资源集合，……，确定与第K个优先级和第K个阈值相关联的第K个资源集合，最后得到K个资源集合。
在第二种实现方式中，第二终端设备可以是基于K个优先级，从资源池中确定K个资源集合。其中，第k个优先级高于第k+1个优先级，k为正整数且小于K。第二终端设备先确定与第1个优先级相关联的第1个资源集合，然后确定与第2个优先级相关联的第2个资源集合，……，确定与第K个优先级相关联的第K个资源集合，最后得到K个资源集合。
在第三种实现方式中，第二终端设备可以是基于K个阈值，从资源池中确定K个资源集合。其中，第k个阈值低于第k+1个阈值，k为正整数且小于K。第二终端设备先确定与第1个阈值相关联的第1个资源集合，然后确定与第2个阈值相关联的第2个资源集合，……，确定与第K个阈值相关联的第K个资源集合，最后得到K个资源集合。
基于此，第k个资源集合中资源的受干扰程度小于第k+1个资源集合中资源的受干扰程度，也即，第k个资源集合中资源优于第k+1个资源集合中资源。相应的，第一终端设备可以先从第k个资源集合中选择侧行资源，然后再从第k+1个资源集合选择侧行资源。也可以理解为，第k个资源集合的使用优先级高于第k+1个资源集合的使用优先级。
示例性的，K为2，第二终端设备先基于第二优先级和第二阈值确定第二资源集合，再基于第三优先级和第三阈值确定第三资源集合。其中，第二优先级高于第三优先级，且第二阈值低于第三阈值。
示例性的，K为2，第二终端设备先基于第二优先级确定第二资源集合，再基于第三优先级确定第三资源集合。其中，第二优先级高于第三优先级。
示例性的，K为2，第二终端设备先基于第二阈值确定第二资源集合，再基于第三阈值确定第三资源集合。其中，第二阈值低于第三阈值。
第二资源集合中资源的受干扰程度小于第三资源集合中资源的受干扰程度，也即第二资源集合中资源优于第三资源集合中资源。本申请实施例中，可以将第二资源集合称为是优先可用的资源集合，将第三资源集合称为是增补可用的资源集合，也即，第一终端设备可以先从第二资源集合中选择侧行资源，然后再从第三资源集合选择侧行资源。也可以理解为，第二个资源集合的使用优先级高于第三个资源集合的使用优先级。
由此可知，第二终端设备确定出的至少一个资源集合中，每个资源集合均对应有优先级和/或阈值，其中，资源集合对应的优先级是第二终设备确定该资源集合的参考优先级，资源集合对应的阈值是第二终设备确定该资源集合的参考阈值。
此外，资源集合对应的优先级和/或阈值可以是由信令配置的。该信令可以是来自网络设备的RRC信令或MAC信令；也可以是来自第一终端设备的PC5RRC信令。
第一个示例中，第二终端设备可以接收来自网络设备或第一终端设备的信令，该信令中包括至少一个资源集合对应的优先级和/或阈值，相应的，第二终端设备可以基于每个资源集合对应的优先级和/或阈值，从资源池中确定该资源集合。
第二个示例中，第二终端设备可以接收来自网络设备或第一终端设备的信令，该信令中包括初始优先级和/或初始阈值，相应的，第二终端设备执行如下：
第一步，第二终端设备基于初始优先级和/或初始阈值，从资源池中确定初始优先级和/或初始阈值对应的资源集合。
第二步，第二终端设备根据预设规则调整初始优先级和/或初始阈值，得到第一次调整后的优先级和/或阈值，进而基于第一次调整后的优先级和/或阈值，从资源池中确定第一次调整后的优先级和/或阈值对应的资源集合。
第三步，第二终端设备根据预设规则调整第一次调整后的优先级和/或阈值，得到第二次调整后的优先级和/或阈值，进而基于第二次调整后的优先级和/或阈值，从资源池中确定第二次调整后的优先级和/或阈值对应的资源集合。
第四步，以此类推，确定出K个资源集合。
可选的，所述四个步骤也可以是分别独立执行。换言之，第二终端设备根据预设规则将初始优先级和/或初始阈值调整K-1次之后，分别得到每次调整后的优先级和/或阈值。第二终端设备共计有K个优先级和/或K个阈值(包括初始优先级和/或初始阈值)，其中，K个优先级和/或K个阈值解释为，K个优先级，或K个阈值，或K对优先级和阈值。第二终端设备分别根据K个优先级和/或K个阈值，得到每个优先级对应的资源集合，或每个阈值对应的资源集合，或每对优先级和阈值对应的资源集合。
在第二个示例中，第二终端设备根据预设规则调整优先级和/或阈值，调整后的优先级低于调整前的优先级，调整后的阈值高于调整前的阈值。
在第二个示例中，第二终端设备从资源池中确定资源集合，理解为，第二终端设备从资源池中确定出的可用资源的比例大于预设比例时，将确定出的可用资源组成资源集合。基于此，当第二终端设备基于优先级和/或阈值在资源池中检测到的可用资源的比例小于或等于预设比例时，第二终端设备需要对阈值提升预设偏移量，得到提升后的阈值，然后根据优先级和/或提升后的阈值，再次从资源池中检测资源。
在第二个示例的一种可选方式中，第二终端设备基于初始优先级和/或初始阈值，在资源池中检测到的可用资源的比例小于或等于预设比例，第二终端设备对初始阈值提升预设偏移量，得到提升后的阈值。其中，提升后的阈值为初始阈值与预设偏移量相加所得的和。
第二终端设备根据提升后的阈值继续进行检测，将资源池中资源的信号强度值与该提升后的阈值进行比较，得到信号强度值小于该提升后的阈值的资源作为可用资源，第二终端设备判断检测到的可用资源的比例是否大于预设比例。
第二终端设备根据预设偏移量循环提升阈值，直到第二终端设备在资源池中检测到的可用资源的比例大于预设比例。第二终端设备基于初始优先级和/或至少一次提升后的阈值，从资源池中确定优先级和/或至少一次提升后的阈值对应的资源集合之后，第二终端设备再根据上述预设规则逐步调整优先级和/或阈值，确定每次调整后的优先级和/或阈值对应的资源集合，直至确定出K个资源集合。
需要说明的是，第二终端设备在根据预设偏移量循环提升阈值时，可以预先设置阈值提升次数，第二终端设备循环提升阈值的次数小于或等于阈值提升次数。或者，第二终端设备在根据预设偏移量循环提升阈值时，可以预先设置最大阈值，第二终端设备提升后的阈值小于或等于最大阈值。也可以理解，最大阈值为初始阈值经过阈值提升次数的提升后所得的值，或者最大阈值大于或等于初始阈值经过阈值提升次数的提升后所得的值。
比如，初始阈值为a，预设偏移量为△a，阈值提升次数为b max，最大阈值为a max，其中，a、△a、b max均为正整数。则有，第二终端设备将初始阈值提升b 1次之后得到的阈值为a+b 1×△a，其中，b 1小于或等于b max，a+b 1×△a小于或等于a max。
在第二个示例中，第二终端设备可以接收来自第一终端设备的PC5RRC信令，具体的，第一终端设备将第一终端设备关联的优先级和/或阈值承载于PC5RRC信令，将该PC5RRC信令发送至第二终端设备。相应的，第二终端设备接收PC5RRC信令，将该PC5RRC信令中的第一终端设备关联的优先级作为初始优先级，和/或，第一终端设备关联的阈值作 为初始阈值。第二终端设备基于初始优先级和/或初始阈值，从资源池中确定K个资源集合的步骤具体可参照上述第一步至第四步。
此处，第k个优先级高于第k+1个优先级，相当于，第k个优先级的值低于第k+1个优先级的值，按照预设规则调整优先级，可以是按照预设规则提升优先级值，相应的，优先级降低。第k个阈值低于第k+1个阈值，按照预设规则调整阈值，可以是按照预设规则提升阈值。相应的，第k个优先级和/或阈值对应的第k个的资源集合的使用优先级高于第k+1个优先级和/或阈值对应的第k+1个的资源集合的使用优先级。
本申请实施例中，第二终端设备确定的某个资源集合中，可以包括N个资源，或者包括周期性的N个资源，其中，N为正整数。资源集合中包括周期性的N个资源时，具体可参照图3举例，该资源集合中包括多个资源预留周期，每个资源预留周期中包括3个资源。
此外，第二终端设备还可以确定当前CBR或CR，该当前CBR或当前CR作为第二终端设备确定是否主动辅助检测资源的条件。
示例性的，第二终端设备可以先判断当前CBR是否小于或等于CBR阈值，若是，则辅助第一终端设备在资源池中检测资源；否则，不辅助第一终端设备在资源池中检测资源。
示例性的，第二终端设备可以先判断当前CR是否小于或等于CR阈值，若是，则辅助第一终端设备在资源池中检测资源；否则，不辅助第一终端设备在资源池中检测资源。
通过CBR或CR判断资源池中资源的使用情况，避免在资源拥塞情况下，因第二终端设备辅助第一终端设备检测资源产生信令交互，进一步影响通信性能。
步骤802，所述第二终端设备向所述第一终端设备发送资源指示信息。
相应的，第一终端设备接收来自第二终端设备的资源指示信息。
第二终端设备在确定至少一个资源集合之后，确定用于指示该至少一个资源集合的资源指示信息，并将该至少一个资源集合的资源指示信息发送至第一终端设备。
第二终端设备若确定一个资源集合，则第二终端设备向第一终端设备发送用于指示该一个资源集合的资源指示信息。第二终端设备若确定多个资源集合，则第二终端设备向第一终端设备发送用于指示每个资源集合的资源指示信息。
为方便描述，下述实施例以一个资源集合说明。该一个资源集合可以是第二终端设备确定出的一个资源集合，也可以是第二终端设备确定出的多个资源集合中的一个。
可选的，资源集合可以是资源的bitmap表示。其中，bitmap的每一位或每z位可以对应一块资源。一块资源包括频域资源和/或时域资源。示例的，频域资源包括频域起始点或子信道数中至少一个；时域资源包括一个slot(时隙)或者用于指示slot的信息。所述频域资源和/或所述时域资源中任何一项都可以是预定义的，或者RRC信令通知的，或者部分被RRC信令通知，部分被预定义。
可选的，当bitmap的一比特位对应一块资源的可用状态时，表示为1的为可用的或者空闲的；表示为0的为不可用的或者被占用的。可选的，当bitmap的z比特位对应一块资源的可用状态时，z比特位可以为参照某阈值可用的或者参照某阈值空闲的；或者，参照某阈值不可用的或者参照某阈值被占用的。可选的，当bitmap的z比特位对应一块资源的可用状态时，z比特位可以为按照某优先级可用的或者按照某优先级空闲的；或者，按照某优先级不可用的或者按照某优先级被占用的。可选的，当bitmap的z比特位对应一块资源的可用状态时，z比特位可以为上述按照某优先级及某阈值可用的或者按照某优先级及某阈值空闲的；或者，按照某优先级及某阈值不可用的或者某优先级及某阈值被占用的。 其中，z为大于或者等于2的整数。所述按照也可以理解为参照或参考。
可选的，由步骤801可知，资源集合对应有优先级和/或阈值，相应的，第二终端设备可以将资源集合对应有优先级和/或阈值承载于资源指示信息中。也即，资源指示信息还用于指示资源集合对应的优先级和/或阈值，该资源集合对应的优先级和/或阈值可用于第一终端设备在至少一个资源集合中选择侧行资源，具体可参照步骤803。
可选的，该阈值为初始阈值，或者确定出该资源集合的阈值。其中，确定出该资源集合的阈值也可以理解为进行阈值提升后的最终使用的阈值。
可选的，由步骤801可知，资源集合对应有阈值提升的次数，相应的，第二终端设备可以将资源集合对应的阈值提升的次数承载于资源指示信息中。也即，资源指示信息还用于指示资源集合对应的阈值提升的次数，该资源集合对应的阈值提升的次数可用于第一终端设备在至少一个资源集合中选择侧行资源，具体可参照步骤803。
进一步的，由步骤801可知，每个资源集合对应有使用优先级，资源指示信息还可以指示资源集合的使用优先级。
下面，说明第二终端设备向第一终端设备指示K个资源集合的使用优先级的实现方式。
本实现方式中，第二终端设备确定的K个资源集合按照使用优先级从高到低依次为资源集合1、资源集合2、……、资源集合K，且分别对应资源指示信息1、资源指示信息2、……、资源指示信息K。
在示例性1中，第二终端设备可以隐式指示K个资源集合的使用优先级，具体的，第二终端设备可以将K个资源集合分别对应的K个资源指示信息，按照使用优先级从高到低依次排列。比如，资源指示信息1、资源指示信息2、……、资源指示信息K。
在示例性2中，第二终端设备可以显式指示K个资源集合的使用优先级，具体的，第二终端设备可以将每个资源集合的使用优先级承载于对应的资源指示信息中。比如，在资源指示信息1中承载资源集合1的使用优先级1，在资源指示信息2中承载资源集合2的使用优先级2，……，在资源指示信息K中承载资源集合K的使用优先级K。
本申请实施例中，资源集合包括周期性的N个资源时，资源指示信息还用于指示资源预留周期。相应的，资源集合对应的资源预留周期用于第一终端设备在至少一个资源集合中选择侧行资源，具体可参照步骤803。
当资源指示信息还用于指示资源预留周期时，可以是在资源指示信息中包括索引信息。此处，可以将索引信息称为是第二索引信息，或周期索引信息，该索引信息用于指示对应资源集合的资源预留周期。在步骤802中，以索引信息称为是第二索引信息为例说明。
比如，针对K个资源集合中任一个资源集合，该资源集合对应的资源指示信息中包括的第二索引信息，该的第二索引信息用于指示该资源集合的资源预留周期。
第一终端设备在确定资源指示信息中第二索引信息之后，可以基于第二索引信息确定该第二索引信息指示的资源预留周期。
一种可选设计中，第一终端设备和第二终端设备中均配置有配置信息，该配置信息中包括M2个索引信息和M2个资源预留周期的一一对应关系，且第二索引信息是M2个索引信息中的一个，M2为正整数。可以将该配置信息称为是第二配置信息，或周期配置信息。在步骤802中，以配置信息称为是第二配置信息为例说明。
示例性，如图9为本申请提供的一种索引信息与资源预留周期的对应关系的示意图，索引信息1对应的资源预留周期为1ms；索引信息2对应的资源预留周期为10ms等。
第二终端设备确定该资源集合对应的资源预留周期，并将用于指示该资源预留周期的第二索引信息承载于资源指示信息中发送至第一终端设备。相应的，第一终端设备确定第二配置信息，并根据第二索引信息和第二配置信息中M2个对应关系，确定第二索引信息对应的资源预留周期。该资源预留周期为辅助资源选择中的资源预留周期。
结合如图9举例，第二终端设备确定资源集合对应的资源预留周期为10ms，并将用于指示该资源预留周期10ms的索引信息2承载于资源指示信息中发送至第一终端设备。相应的，第一终端设备确定第二配置信息，第二配置信息中包括如图9所示的M2个对应关系，第一终端设备根据索引信息2和M2个对应关系，确定资源预留周期为10ms。
本申请实施例中，第二配置信息可以是协议规定的，或者是由网络设备配置的。
当第二配置信息是由网络设备配置时，一种可选实现方式中，网络设备将第二配置信息分别发送至第一终端设备和第二终端设备，相应的，第一终端设备接收来自网络设备的第二配置信息，确定M2个对应关系；第二终端设备接收来自网络设备的第二配置信息，确定M2个对应关系。
本申请实施例中，网络设备在向第一终端设备和第二终端设备配置第二配置信息时，可以是资源池粒度，或者是侧行链路粒度。具体有如下两种示例：
在第一种示例中，网络设备记录有当前所有资源池，以及每个资源池关联的终端设备。网络设备可以针对每个资源池，确定该资源池对应的配置信息，并将该资源池对应的配置信息配置于该资源池所关联的终端设备。网络设备基于每个资源池确定配置信息，具有针对性。
具体实现中，网络设备将第一终端设备和第二终端设备所在资源池的资源池标识记录在该资源池对应的第二配置信息中，也可以说，第二配置信息中的资源池标识关联于第二配置信息中M2个对应关系，也即关联于第二索引信息与资源预留周期的对应关系，或者说，第二配置信息中索引信息与资源预留周期的对应关系关联于第二配置信息中资源池标识对应的资源池。
网络设备将第二配置信息分别发送至第一终端设备和第二终端设备，相应的，第一终端设备和第二终端设备分别根据该第二配置信息确定M2个对应关系。具体的，网络设备针对资源池中所有终端设备发送第二配置信息，从而该资源池中所有终端设备接收第二配置信息，并根据该第二配置信息确定M2个对应关系。或者，网络设备广播该第二配置信息，资源池中终端设备在接收到该第二配置信息后，确定第二配置信息中资源池标识与自身所在资源池的资源池标识一致，根据该第二配置信息确定M2个对应关系。
在第二种示例中，网络设备可以针对与网络设备连接的所有终端设备配置该第二配置信息。具体实现中，网络设备将第二配置信息发送至与网络设备连接的所有终端设备，相应的，各终端设备接收第二配置信息，并根据该第二配置信息确定M2个对应关系。
示例性的，该第二配置信息可以是网络设备通过RRC信令、MAC层信令(例如，MAC CE)、物理层信令(例如，DCI或PDCCH)中的任一种或任多种配置/指示/发送的。
需要说明的是，现有第一终端设备向第二终端设备发送数据时，通常也会携带资源预留周期。第二配置信息不同于现有资源预留周期所对应的索引值，第二配置信息为针对这种辅助资源选择所专门配置的。第二配置信息中所包含的资源预留周期的粒度可以大于现有资源预留周期的粒度。或者说，第二配置信息中所包含的资源预留周期所对应的索引个数可以小于现有资源预留周期所对应的索引个数。举例来说，第二配置信息中所包含的资 源预留周期的粒度为10ms，比如第二配置信息中所包含的资源预留周期的分别为10ms、20ms、30ms、……、90ms、100ms，且分别对应index1、index2、……、index10共10个索引。现有资源预留周期的粒度为1ms，比如现有资源预留周期分别为1ms、2ms、3ms、……、99ms、100ms，且分别对应index1、index2、……、index100共100个索引。
辅助资源选择不同于预留资源进行侧行链路数据通信，所通知的辅助资源可能被使用，也可能不被使用。第二配置信息中所包含的资源预留周期的粒度大于现有资源预留周期的粒度，有助于减少辅助资源划分的粒度，简化辅助资源的通知。
在步骤802中，第二终端设备将资源指示信息发送至第一终端设备时，资源指示信息可承载于第二终端设备向第一终端设备发送的MAC CE中，或承载于第二终端设备向第一终端设备发送的SCI中。
资源指示信息承载于第二终端设备向第一终端设备发送的SCI中，具体可以是，资源指示信息承载于第二终端设备向第一终端设备发送的两级SCI的第一级SCI中，可以将该第一级SCI称之为第五SCI。或，资源指示信息承载于第二终端设备向第一终端设备发送的两级SCI的第二级SCI中，可以将该第二级SCI称之为第六SCI，第六SCI关联于第五SCI，第五SCI指示第六SCI的格式等信息。
本申请中，资源指示信息承载于第五SCI的实现方式可以参照上述资源指示信息承载于第三SCI的实现方式，资源指示信息承载于第六SCI的实现方式可以参照上述资源指示信息承载于第四SCI的实现方式，此处不再赘述。
在步骤801至步骤802中，同样可以将承载有资源指示信息的SCI称为是反馈SCI或辅助SCI，该反馈SCI或辅助SCI用于指示第二终端设备主动辅助第一终端设备在资源池中检测到的至少一个资源集合，也即用于第一终端设备选择侧行资源的至少一个资源集合。
步骤803，所述第一终端设备根据所述资源指示信息，从所述至少一个资源集合中选择侧行资源。
由于资源指示信息可以指示资源集合的使用优先级，则第一终端设备可以根据至少一个资源集合的使用优先级从高到低的顺序，依次从各资源集合中选择侧行资源。
如上述步骤802的示例性1中，第一终端设备可以在接收到该K个资源指示信息后，根据K个资源指示信息的前后顺序，确定K个资源集合的使用优先级，然后基于使用优先级从高到低的顺序，依次从各资源集合中选择侧行资源。
如上述步骤802的示例性2中，第一终端设备可以在接收到该K个资源指示信息后，从K个资源指示信息中分别获取K个资源集合的使用优先级，然后基于使用优先级从高到低的顺序，依次从各资源集合中选择侧行资源。
结合上述描述，第二终端设备确定第二资源集合和第三资源集合，第二终端设备向第一终端设备发送第二资源集合的资源指示信息和第三资源集合的资源指示信息，可以有如下三种实现方式。
第1种实现方式中，第二终端设备将第二资源集合的资源指示信息和第三资源集合的资源指示信息从前到后依次排列。相应的，第一终端设备从前一个资源指示信息对应的第二资源集合中选择侧行资源。第一终端设备在确定第二资源集合中资源不足时，从后一个资源指示信息对应的第三资源集合中选择侧行资源。
第2种实现方式中，第二终端设备将第二资源集合的使用优先级承载于第二资源集合的资源指示信息中，以及，将第三资源集合的使用优先级承载于第三资源集合的资源指示 信息中。相应的，第一终端设备获取资源指示信息中的使用优先级，先从使用优先级高的第二资源集合中选择侧行资源。第一终端设备在确定第二资源集合中资源不足时，从使用优先级低的第三资源集合中选择侧行资源。
第3种实现方式中，第二终端设备通过第三指示信息指示资源集合为第二资源集合还是第三资源集合。示例性的，该第三指示信息占用1个比特位，第三指示信息取值为1指示资源集合为第二资源集合，第三指示信息取值为0指示资源集合为第三资源集合。第二终端设备将取值为1的第三指示信息承载于第二资源集合的资源指示信息中，以及将取值为0的第三指示信息承载于第三资源集合的资源指示信息中。相应的，第一终端设备获取资源指示信息中的第三指示信息，先从取值为1的第三指示信息对应的第二资源集合中选择侧行资源。第一终端设备在确定第二资源集合中资源不足时，从取值为0的第三指示信息对应的第三资源集合中选择侧行资源。
本申请中，资源指示信息还用于指示至少一个资源集合的优先级和/或阈值。相应的，第一终端设备可以基于资源指示信息指示的至少一个资源集合的优先级和/或阈值，从至少一个资源集合中选择侧行资源。
在第一种实现方式中，第一终端设备可以根据第一终端设备关联的优先级、第一终端设备关联的阈值和资源指示信息指示的至少一个资源集合的优先级和阈值，从至少一个资源集合中选择侧行资源。具体的，第一终端设备针对至少一个资源集合中的任一个资源集合，若该资源集合关联的优先级低于第一终端设备关联的优先级，且该资源集合关联的阈值小于第一终端设备关联的阈值，则从该资源集合中选择侧行资源。
在第二种实现方式中，第一终端设备可以根据第一终端设备关联的优先级和资源指示信息指示的至少一个资源集合的优先级，从至少一个资源集合中选择侧行资源。具体的，第一终端设备针对至少一个资源集合中的任一个资源集合，若该资源集合关联的优先级低于第一终端设备关联的优先级，则从该资源集合中选择侧行资源。
在第三种实现方式中，第一终端设备可以根据第一终端设备关联的阈值和资源指示信息指示的至少一个资源集合的阈值，从至少一个资源集合中选择侧行资源。具体的，第一终端设备针对至少一个资源集合中的任一个资源集合，若该资源集合关联的阈值小于第一终端设备关联的阈值，则从该资源集合中选择侧行资源。
在上述步骤803的第一种实现方式至第三种实现方式中，可以将关联的优先级低于第一终端设备关联的优先级，和/或，关联的阈值小于第一终端设备关联的阈值的资源集合称为是目标资源集合。第一终端设备从目标资源集合中选择侧行资源时，具体可以是确定该目标资源集合中信号强度值最小的i个资源作为侧行资源，其中，i为正整数，且i小于或等于N。
在上述步骤803的第一种实现方式至第三种实现方式中，若第一终端设备需要预留周期性的资源，则可以根据自身对资源预留周期的需求和该资源集合中资源预留周期，从资源集合中确定周期性的n个资源，其中，n为正整数，且n小于或等于N。
基于步骤803中第一种实现方式至第三种实现方式可知，第一终端设备关联的优先级高于侧行资源所属资源集合关联的优先级，和/或，第一终端设备关联的阈值大于侧行资源所属资源集合关联的阈值。
由于资源指示信息还可以指示至少一个资源集合的阈值的提升次数，也即在确定该资源集合时，第二终端设备提升阈值的总次数。相应的，第一终端设备可以基于资源指示信 息指示的至少一个资源集合的阈值的提升次数，确定某个资源集合中可用资源是通过几次阈值提升获取到的，因此在使用时判断是否可以被正确使用或者是否可以被优先使用。
此外，在一种可选方式中，第二终端设备可以将至少一个资源集合的资源指示信息发送至多个终端设备，也即，该至少一个资源集合不仅是用于第一终端设备选择侧行资源，还用于其它终端设备选择侧行资源。在该种方式中，第一终端设备确定目标资源集合之后，可以采用现有技术中资源竞争方式，从该目标资源集合中与其它终端设备竞争资源。
步骤804，第一终端设备通过侧行资源发送侧行信息。
第一终端设备在至少一个资源集合中选择侧行资源之后，可以通过侧行资源发送侧行信息。具体可以是，通过侧行资源向第三终端设备发送侧行数据信息和/或侧行控制信息。
本申请实施例中，第二终端设备主动辅助第一终端设备从资源池中检测至少一个资源集合，避免隐藏节点问题，有助于提升检测出可用资源的准确率。进一步的，第一终端设备无需向第二终端设备发送资源选择参数，最小化第一终端设备和第二终端设备之间的信令开销。
此外，本申请实施例中，第二终端设备可以执行如图6中流程和如图8中流程，也即第二终端设备可以在接收第一终端设备的索引信息后，辅助第二终端设备在资源池中检测资源，也可以主动辅助第一终端设备在资源池中检测资源。一种情况下，第二终端设备主动辅助第一终端设备在资源池中检测资源，然后接收到来自第一终端设备的索引信息，则基于索引信息指示的资源选择参数，辅助第一终端设备在资源池中检测资源。
上述主要从各个网元之间交互的角度对本申请提供的方案进行了介绍。可以理解的是，上述各网元为了实现上述功能，其包含了执行各个功能相应的硬件结构和/或软件模块。本领域技术人员应该很容易意识到，结合本文中所公开的实施例描述的各示例的单元及算法步骤，本发明能够以硬件或硬件和计算机软件的结合形式来实现。某个功能究竟以硬件还是计算机软件驱动硬件的方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本发明的范围。
可以理解的是，上述各个方法实施例中，对应由终端设备实现的步骤或者操作，也可以由配置于终端设备的部件(例如芯片或者电路)实现。本申请实施例还提供用于实现以上任一种方法的装置，例如，提供一种装置包括用以实现以上任一种方法中终端设备所执行的各个步骤的单元(或手段)。
基于上述内容和相同构思，图10和图11为本申请的提供的可能的通信装置的结构示意图。这些通信装置可以用于实现上述方法实施例中第一终端设备或第二终端设备的功能，因此也能实现上述方法实施例所具备的有益效果。在本申请中，该通信装置可以是如图1所示的终端设备1或终端设备2，还可以是应用于终端设备的模块(如芯片)。
如图10所示，该通信装置1000包括处理单元1001和通信单元1002。
本申请中，通信单元1002可以独立执行接收功能和/或发送功能，也可以在处理单元1001的控制下执行接收功能和/或发送功能。
通信装置1000用于实现上述图6中所示的方法实施例中第一终端设备的功能时，所述处理单元1001用于控制所述通信单元1002向第二终端设备发送索引信息，所述索引信息用于指示资源选择参数，所述资源选择参数用于为所述第一终端设备选择侧行资源；所述处理单元1001还用于控制所述通信单元1002接收来自所述第二终端设备的资源指示信 息，所述资源指示信息用于指示所述侧行资源。
在一种可能的实现方式中，所述资源选择参数包括下述至少一项：资源预留周期、优先级、初始阈值、阈值提升次数、最大阈值、资源检测相关时长、数据量、包时延预算。
在一种可能的实现方式中，所述索引信息承载于第一SCI，所述第一SCI是所述通信单元1002向所述第二终端设备发送的第一级SCI；或，所述索引信息承载于第二SCI，所述第二SCI是所述通信单元1002向所述第二终端设备发送的第二级SCI，所述第二SCI由所述第一SCI指示。
在一种可能的实现方式中，所述第一SCI还包括第一指示信息，所述第一指示信息用于指示所述第一SCI中包括所述索引信息，或指示所述第二SCI中包括所述索引信息。
在一种可能的实现方式中，所述第一指示信息承载于所述第一SCI中的预留比特位。
在一种可能的实现方式中，所述第一SCI中格式字段指示所述第二SCI的第一格式时，所述第二SCI中的预留比特位承载所述索引信息；或，所述第一SCI中格式字段指示所述第一格式时，所述第二SCI中的预留比特位承载所述索引信息和所述第二终端设备的标识；和/或，所述第一SCI中格式字段指示所述第二SCI的第二格式时，所述第二SCI由所述索引信息、所述第一终端设备的标识和所述第二终端设备的标识组成。
在一种可能的实现方式中，所述处理单元1001还用于确定配置信息，所述配置信息中包括所述索引信息和所述资源选择参数的对应关系。
在一种可能的实现方式中，所述处理单元1001还用于控制所述通信单元1002接收来自网络设备的配置信息；所述配置信息中包括M1个对应关系，每个对应关系为一个索引和一个或一组资源选择参数的对应关系，M1大于或等于2。其中，资源选择参数可以是以下参数中的一项或多项的组合：资源预留周期、优先级、初始阈值、阈值提升次数、资源检测相关时长、最大阈值、数据量、包时延预算。
在一种可能的实现方式中，所述配置信息还包括资源池标识，所述索引信息与所述资源选择参数的对应关系关联于所述资源池标识对应的资源池。
在一种可能的实现方式中，所述资源指示信息承载于第三SCI，所述第三SCI是所述通信单元1002从所述第二终端设备接收的第一级SCI；或，所述资源指示信息承载于第四SCI，所述第四SCI是所述通信单元1002从所述第二终端设备接收的第二级SCI，所述第四SCI由所述第三SCI指示。
在一种可能的实现方式中，所述第三SCI还包括第二指示信息，所述第二指示信息用于指示所述第三SCI中包括所述资源指示信息，或指示所述第四SCI中包括所述资源指示信息。
在一种可能的实现方式中，所述第二指示信息承载于所述第三SCI中的预留比特位。
在一种可能的实现方式中，所述资源指示信息承载于所述第三SCI中的用于资源分配的字段。
在一种可能的实现方式中，所述处理单元1001还用于控制所述通信单元1002在接收来自所述第二终端设备的资源指示信息之后，通过所述侧行资源发送侧行信息。
通信装置1000用于实现上述图6中所示的方法实施例中第二终端设备的功能时，所述通信单元1002用于接收来自第一终端设备的索引信息；所述处理单元1001用于根据所述索引信息指示的资源选择参数，选择侧行资源；所述第二终端设备向所述第一终端设备发送资源指示信息，所述资源指示信息用于指示所述侧行资源。
在一种可能的实现方式中，所述资源选择参数包括下述至少一项：资源预留周期、优先级、初始阈值、阈值提升次数、最大阈值、资源检测相关时长、数据量、包时延预算。
在一种可能的实现方式中，所述索引信息承载于第一SCI，所述第一SCI是所述通信单元1002从所述第一终端设备接收的第一级SCI；或，所述索引信息承载于第二SCI，所述第二SCI是所述通信单元1002从所述第一终端设备接收的第二级SCI，所述第二SCI由所述第一SCI指示。
在一种可能的实现方式中，所述第一SCI还包括第一指示信息，所述第一指示信息用于指示所述第一SCI中包括所述索引信息，或指示所述第二SCI中包括所述索引信息。
在一种可能的实现方式中，所述第一指示信息承载于所述第一SCI中的预留比特位。
在一种可能的实现方式中，所述第一SCI中格式字段指示所述第二SCI的第一格式时，所述第二SCI中的预留比特位承载所述索引信息；或，所述第一SCI中格式字段指示所述第一格式时，所述第二SCI中的预留比特位承载所述索引信息和所述第二终端设备的标识；和/或，所述第一SCI中格式字段指示所述第二SCI的第二格式时，所述第二SCI由所述索引信息、所述第一终端设备的标识和所述第二终端设备的标识组成。
在一种可能的实现方式中，所述处理单元1001还用于确定配置信息；所述配置信息中包括所述索引信息和所述资源选择参数的对应关系。
在一种可能的实现方式中，所述通信单元1002还用于接收来自网络设备的配置信息；所述配置信息中包括M1个对应关系，每个对应关系为一个索引和一个或一组资源选择参数的对应关系，M1大于或等于2。其中资源选择参数可以是以下参数中的一项或多项的组合：资源预留周期、优先级、初始阈值、阈值提升次数、资源检测相关时长、最大阈值、数据量、包时延预算。
在一种可能的实现方式中，所述配置信息中包括资源池标识，所述索引信息和所述资源选择参数的对应关系关联于所述资源池标识对应的资源池。
在一种可能的实现方式中，所述资源指示信息承载于第三SCI，所述第三SCI是所述通信单元1002向所述第一终端设备发送的第一级SCI；或，所述资源指示信息承载于第四SCI，所述第四SCI是所述通信单元1002向所述第一终端设备发送的第二级SCI，所述第四SCI由所述第三SCI指示。
在一种可能的实现方式中，所述第三SCI还包括第二指示信息，所述第二指示信息用于指示所述第三SCI中包括所述资源指示信息，或指示所述第四SCI中包括所述资源指示信息。
在一种可能的实现方式中，所述第二指示信息承载于所述第三SCI中的预留比特位。
在一种可能的实现方式中，所述资源指示信息承载于所述第三SCI中的用于资源分配的字段。
通信装置1000用于实现上述图8中所示的方法实施例中第二终端设备的功能时，所述处理单元1001用于确定至少一个资源集合，所述至少一个资源集合用于所述第一终端设备选择侧行资源；所述通信单元1002用于向所述第一终端设备发送资源指示信息，所述资源指示信息用于指示所述至少一个资源集合。
在一种可能的实现方式中，所述通信单元1002还用于接收来自网络设备的使能信息；所述使能信息用于使能所述第二终端设备为所述第一终端设备确定所述至少一个资源集合。
在一种可能的实现方式中，所述至少一个资源集合包括N个侧行资源；或，所述至少一个资源集合包括周期性的N个侧行资源，N为正整数。
在一种可能的实现方式中，所述处理单元1001在确定至少一个资源集合之前，还用于确定CBR小于或等于CBR阈值。
在一种可能的实现方式中，所述资源指示信息还用于指示所述至少一个资源集合关联的优先级和/或阈值，资源集合关联的优先级为用于确定所述资源集合的参考优先级，资源集合关联的阈值为用于确定所述资源集合的参考阈值。
在一种可能的实现方式中，所述至少一个资源集合关联的优先级和/或阈值是通过信令配置的；所述信令是来自网络设备的RRC信令或MAC信令，或是来自所述第一终端设备的PC5RRC信令。
在一种可能的实现方式中，所述资源指示信息还用于指示所述至少一个资源集合关联的使用优先级；所述至少一个资源集合关联的使用优先级用于指示所述第一终端设备依次使用所述至少一个资源集合选择侧行资源的顺序。
在一种可能的实现方式中，所述资源指示信息中包括所述至少一个资源集合的索引信息，索引信息用于指示对应资源集合的资源预留周期。
在一种可能的实现方式中，所述处理单元1001还用于确定配置信息；所述配置信息包括所述索引信息和所述资源预留周期的对应关系。
在一种可能的实现方式中，所述通信单元1002还用于接收来自网络设备的配置信息；所述配置信息中包括M2个索引信息和M2个资源预留周期的一一对应关系，M2大于或等于2。
在一种可能的实现方式中，所述配置信息还包括资源池标识，所述索引信息和所述资源预留周期的对应关系关联于所述资源池标识对应的资源池。
通信装置1000用于实现上述图8中所示的方法实施例中第一终端设备的功能时，所述通信单元1002用于接收来自第二终端设备的资源指示信息；所述资源指示信息用于指示至少一个资源集合；所述处理单元1001用于根据所述资源指示信息，从所述至少一个资源集合中选择侧行资源。
在一种可能的实现方式中，所述至少一个资源集合包括N个侧行资源；或，所述至少一个资源集合包括周期性的N个侧行资源，N为正整数。
在一种可能的实现方式中，所述资源指示信息还用于指示所述至少一个资源集合关联的优先级和/或阈值，资源集合关联的优先级为用于确定所述资源集合的参考优先级，资源集合关联的阈值为用于确定所述资源集合的参考阈值。
在一种可能的实现方式中，所述第一终端设备关联的优先级高于所述侧行资源所属资源集合关联的优先级，和/或，所述第一终端设备关联的阈值大于所述侧行资源所属资源集合关联的阈值。
在一种可能的实现方式中，所述方法还包括：所述通信单元1002还用于向所述第二终端设备发送PC5RRC信令；所述PC5RRC信令中包括所述第一终端设备关联的优先级和/或阈值。
在一种可能的实现方式中，所述资源指示信息还用于指示所述至少一个资源集合关联的使用优先级；所述至少一个资源集合关联的使用优先级用于指示所述第一终端设备依次使用所述至少一个资源集合选择侧行资源的顺序。
在一种可能的实现方式中，所述资源指示信息中包括所述至少一个资源集合的索引信息，索引信息用于指示对应资源集合的资源预留周期。
在一种可能的实现方式中，所述处理单元1001还用于确定配置信息；所述配置信息包括所述索引信息和所述资源预留周期的对应关系。
在一种可能的实现方式中，所述通信单元1002还用于接收来自网络设备的配置信息；所述配置信息中包括M2个索引信息和M2个资源预留周期的一一对应关系，M2大于或等于2。
在一种可能的实现方式中，所述配置信息还包括资源池标识，所述索引信息和所述资源预留周期的对应关系关联于所述资源池标识对应的资源池。
在一种可能的实现方式中，所述通信单元1002还用于通过所述侧行资源发送侧行信息。
基于上述内容和相同构思，如图11所示，图11所示的装置可以为图10所示的装置的一种硬件电路的实现方式。该通信装置可适用于图6或图8中所示出的流程图中，执行上述方法实施例中第一终端设备或者第二终端设备的功能。
为了便于说明，图11仅示出了该通信装置的主要部件。
图11所示的装置1100包括至少一个处理器1120，用于实现本申请实施例提供的图6或图8中任一方法。
装置1100还可以包括至少一个存储器1130，用于存储程序指令和/或数据。存储器1130和处理器1120耦合。本申请实施例中的耦合是装置、单元或模块之间的间接耦合或通信连接，可以是电性，机械或其它的形式，用于装置、单元或模块之间的信息交互。处理器1120可能和存储器1130协同操作。处理器1120可能执行存储器1130中存储的程序指令。所述至少一个存储器中的至少一个可以包括于处理器中。
在实现过程中，上述方法的各步骤可以通过处理器中的硬件的集成逻辑电路或者软件形式的指令完成。结合本申请实施例所公开的方法的步骤可以直接体现为硬件处理器执行完成，或者用处理器中的硬件及软件模块组合执行完成。软件模块可以位于随机存储器，闪存、只读存储器，可编程只读存储器或者电可擦写可编程存储器、寄存器等本领域成熟的存储介质中。该存储介质位于存储器，处理器读取存储器中的信息，结合其硬件完成上述方法的步骤。为避免重复，这里不再详细描述。
应注意，本申请实施例中的处理器可以是一种集成电路芯片，具有信号的处理能力。在实现过程中，上述方法实施例的各步骤可以通过处理器中的硬件的集成逻辑电路或者软件形式的指令完成。上述的处理器可以是通用处理器、数字信号处理电路(digital signal processor，DSP)、专用集成芯片(application specific integrated circuit，ASIC)、现场可编程门阵列(field programmable gate array，FPGA)或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件。可以实现或者执行本申请实施例中的公开的各方法、步骤及逻辑框图。通用处理器可以是微处理器或者该处理器也可以是任何常规的处理器等。结合本申请实施例所公开的方法的步骤可以直接体现为硬件译码处理器执行完成，或者用译码处理器中的硬件及软件模块组合执行完成。软件模块可以位于随机存储器，闪存、只读存储器，可编程只读存储器或者电可擦写可编程存储器、寄存器等本领域成熟的存储介质中。该存储介质位于存储器，处理器读取存储器中的信息，结合其硬件完成上述方法的步骤。
可以理解，本申请实施例中的存储器可以是易失性存储器或非易失性存储器，或可包括易失性和非易失性存储器两者。其中，非易失性存储器可以是只读存储器(read-only memory，ROM)、可编程只读存储器(programmable ROM，PROM)、可擦除可编程只读存储器(erasable PROM，EPROM)、电可擦除可编程只读存储器(electrically EPROM，EEPROM)或闪存。易失性存储器可以是随机存取存储器(random access memory，RAM)，其用作外部高速缓存。通过示例性但不是限制性说明，许多形式的RAM可用，例如静态随机存取存储器(static RAM，SRAM)、动态随机存取存储器(dynamic RAM，DRAM)、同步动态随机存取存储器(synchronous DRAM，SDRAM)、双倍数据速率同步动态随机存取存储器(double data rate SDRAM，DDR SDRAM)、增强型同步动态随机存取存储器(enhanced SDRAM，ESDRAM)、同步连接动态随机存取存储器(synchlink DRAM，SLDRAM)和直接内存总线随机存取存储器(direct rambus RAM，DR RAM)。应注意，本文描述的系统和方法的存储器旨在包括但不限于这些和任意其它适合类型的存储器。
装置1100还可以包括通信接口1110，用于通过传输介质和其它设备进行通信，从而用于装置1100中的装置可以和其它设备进行通信。在本申请实施例中，通信接口可以是收发器、电路、总线、模块或其它类型的通信接口。在本申请实施例中，通信接口为收发器时，收发器可以包括独立的接收器、独立的发射器；也可以集成收发功能的收发器、或者是接口电路。
装置1100还可以包括通信线路1140。其中，通信接口1110、处理器1120以及存储器1130可以通过通信线路1140相互连接；通信线路1140可以是外设部件互连标准(peripheral component interconnect，简称PCI)总线或扩展工业标准结构(extended industry standard architecture，简称EISA)总线等。所述通信线路1140可以分为地址总线、数据总线、控制总线等。为便于表示，图11中仅用一条粗线表示，但并不表示仅有一根总线或一种类型的总线。
基于上述内容和相同构思，本申请提供一种通信系统，该通信系统包括上述图6方法实施例中的第一终端设备和第二终端设备，或者包括上述图8方法实施例中的第一终端设备和第二终端设备。
基于上述内容和相同构思，本申请提供一种计算机可读存储介质，计算机可读存储介质中存储有计算机程序或指令，当计算机程序或指令被通信装置执行时，使得该通信装置执行上述图6或图8中方法实施例中第一终端设备的功能或第二终端设备的功能。
基于上述内容和相同构思，本申请提供一种计算机程序产品，该计算机程序产品包括计算机程序或指令，当该计算机程序或指令被通信装置执行时，使得该通信装置执行上述图6或图8中方法实施例中第一终端设备的功能或第二终端设备的功能。
本领域内的技术人员应明白，本申请的实施例可提供为方法、系统、或计算机程序产品。因此，本申请可采用完全硬件实施例、完全软件实施例、或结合软件和硬件方面的实施例的形式。而且，本申请可采用在一个或多个其中包含有计算机可用程序代码的计算机可用存储介质(包括但不限于磁盘存储器、光学存储器等)上实施的计算机程序产品的形式。

Claims (53)

  1. 一种通信方法，其特征在于，包括：
    第一终端设备向第二终端设备发送索引信息，所述索引信息用于指示资源选择参数，所述资源选择参数用于为所述第一终端设备选择侧行资源；
    所述第一终端设备接收来自所述第二终端设备的资源指示信息，所述资源指示信息用于指示所述侧行资源。
  2. 如权利要求1所述的方法，其特征在于，所述资源选择参数包括下述至少一项：
    资源预留周期、优先级、初始阈值、阈值提升次数、最大阈值、资源检测相关时长、数据量、包时延预算。
  3. 如权利要求1或2所述的方法，其特征在于，所述索引信息承载于第一侧行链路控制信息SCI，所述第一SCI是所述第一终端设备向所述第二终端设备发送的第一级SCI；或，
    所述索引信息承载于第二SCI，所述第二SCI是所述第一终端设备向所述第二终端设备发送的第二级SCI，所述第二SCI由所述第一SCI指示。
  4. 如权利要求1至3任一项所述的方法，其特征在于，第一SCI还包括第一指示信息，所述第一指示信息用于指示所述第一SCI中包括所述索引信息，或指示所述第二SCI中包括所述索引信息。
  5. 如权利要求4所述的方法，其特征在于，所述第一指示信息承载于所述第一SCI中的预留比特位。
  6. 如权利要求1至3任一项所述的方法，其特征在于，所述第一SCI中格式字段指示所述第二SCI的第一格式时，所述第二SCI中的预留比特位承载所述索引信息；或，所述第一SCI中格式字段指示所述第一格式时，所述第二SCI中的预留比特位承载所述索引信息和所述第二终端设备的标识；和/或，
    所述第一SCI中格式字段指示所述第二SCI的第二格式时，所述第二SCI由所述索引信息、所述第一终端设备的标识和所述第二终端设备的标识组成。
  7. 如权利要求1至6任一项所述的方法，其特征在于，还包括：
    所述第一终端设备确定配置信息，所述配置信息中包括所述索引信息和所述资源选择参数的对应关系。
  8. 如权利要求7所述的方法，其特征在于，所述配置信息还包括资源池标识，所述索引信息与所述资源选择参数的对应关系关联于所述资源池标识对应的资源池。
  9. 如权利要求1至8任一项所述的方法，其特征在于，所述资源指示信息承载于第三SCI，所述第三SCI是所述第一终端设备从所述第二终端设备接收的第一级SCI；或，
    所述资源指示信息承载于第四SCI，所述第四SCI是所述第一终端设备从所述第二终端设备接收的第二级SCI，所述第四SCI由所述第三SCI指示。
  10. 如权利要求9所述的方法，其特征在于，所述第三SCI还包括第二指示信息，所述第二指示信息用于指示所述第三SCI中包括所述资源指示信息，或指示所述第四SCI中包括所述资源指示信息。
  11. 如权利要求10所述的方法，其特征在于，所述第二指示信息承载于所述第三SCI中的预留比特位。
  12. 如权利要求9至11任一项所述的方法，其特征在于，所述资源指示信息承载于所述第三SCI中的用于资源分配的字段。
  13. 一种通信方法，其特征在于，包括：
    第二终端设备接收来自第一终端设备的索引信息；
    所述第二终端设备根据所述索引信息指示的资源选择参数选择侧行资源；
    所述第二终端设备向所述第一终端设备发送资源指示信息，所述资源指示信息用于指示所述侧行资源。
  14. 如权利要求13所述的方法，其特征在于，所述资源选择参数包括下述至少一项：
    资源预留周期、优先级、初始阈值、阈值提升次数、最大阈值、资源检测相关时长、数据量、包时延预算。
  15. 如权利要求13或14所述的方法，其特征在于，所述索引信息承载于第一侧行链路控制信息SCI，所述第一SCI是所述第二终端设备从所述第一终端设备接收的第一级SCI；或，
    所述索引信息承载于第二SCI，所述第二SCI是所述第二终端设备从所述第一终端设备接收的第二级SCI，所述第二SCI由所述第一SCI指示。
  16. 如权利要求13至15任一项所述的方法，其特征在于，所述第一SCI还包括第一指示信息，所述第一指示信息用于指示所述第一SCI中包括所述索引信息，或指示所述第二SCI中包括所述索引信息。
  17. 如权利要求16所述的方法，其特征在于，所述第一指示信息承载于所述第一SCI中的预留比特位。
  18. 如权利要求13至15任一项所述的方法，其特征在于，所述第一SCI中格式字段指示所述第二SCI的第一格式时，所述第二SCI中的预留比特位承载所述索引信息；或，所述第一SCI中格式字段指示所述第一格式时，所述第二SCI中的预留比特位承载所述索引信息和所述第二终端设备的标识；和/或，
    所述第一SCI中格式字段指示所述第二SCI的第二格式时，所述第二SCI由所述索引信息、所述第一终端设备的标识和所述第二终端设备的标识组成。
  19. 如权利要求13至18任一项所述的方法，其特征在于，还包括：
    所述第二终端设备确定配置信息；所述配置信息中包括所述索引信息和所述资源选择参数的对应关系。
  20. 如权利要求19所述的方法，其特征在于，所述配置信息中还包括资源池标识，所述索引信息和所述资源选择参数的对应关系关联于所述资源池标识对应的资源池。
  21. 如权利要求13至20任一项所述的方法，其特征在于，所述资源指示信息承载于第三SCI，所述第三SCI是所述第二终端设备向所述第一终端设备发送的第一级SCI；或，
    所述资源指示信息承载于第四SCI，所述第四SCI是所述第二终端设备向所述第一终端设备发送的第二级SCI，所述第四SCI由所述第三SCI指示。
  22. 如权利要求21所述的方法，其特征在于，所述第三SCI还包括第二指示信息，所述第二指示信息用于指示所述第三SCI中包括所述资源指示信息，或指示所述第四SCI中包括所述资源指示信息。
  23. 如权利要求22所述的方法，其特征在于，所述第二指示信息承载于所述第三SCI中的预留比特位。
  24. 如权利要求21至23任一项所述的方法，其特征在于，所述资源指示信息承载于所述第三SCI中的用于资源分配的字段。
  25. 一种通信装置，其特征在于，包括：
    通信单元和处理单元；
    所述处理单元用于控制所述通信单元向第二终端设备发送索引信息，所述索引信息用于指示资源选择参数，所述资源选择参数用于为第一终端设备选择侧行资源；
    所述处理单元还用于控制所述通信单元接收来自所述第二终端设备的资源指示信息，所述资源指示信息用于指示所述侧行资源。
  26. 如权利要求25所述的通信装置，其特征在于，所述资源选择参数包括下述至少一项：
    资源预留周期、优先级、初始阈值、阈值提升次数、最大阈值、资源检测相关时长、数据量、包时延预算。
  27. 如权利要求25或26所述的通信装置，其特征在于，所述索引信息承载于第一侧行链路控制信息SCI，所述第一SCI是所述通信单元向所述第二终端设备发送的第一级SCI；或，
    所述索引信息承载于第二SCI，所述第二SCI是所述通信单元向所述第二终端设备发送的第二级SCI，所述第二SCI由所述第一SCI指示。
  28. 如权利要求26至27任一项所述的通信装置，其特征在于，第一SCI还包括第一指示信息，所述第一指示信息用于指示所述第一SCI中包括所述索引信息，或指示所述第二SCI中包括所述索引信息。
  29. 如权利要求28所述的通信装置，其特征在于，所述第一指示信息承载于所述第一SCI中的预留比特位。
  30. 如权利要求25至27任一项所述的通信装置，其特征在于，所述第一SCI中格式字段指示所述第二SCI的第一格式时，所述第二SCI中的预留比特位承载所述索引信息；或，所述第一SCI中格式字段指示所述第一格式时，所述第二SCI中的预留比特位承载所述索引信息和所述第二终端设备的标识；和/或，
    所述第一SCI中格式字段指示所述第二SCI的第二格式时，所述第二SCI由所述索引信息、所述第一终端设备的标识和所述第二终端设备的标识组成。
  31. 如权利要求25至30任一项所述的通信装置，其特征在于，所述处理单元还用于确定配置信息，所述配置信息中包括所述索引信息和所述资源选择参数的对应关系。
  32. 如权利要求31所述的通信装置，其特征在于，所述配置信息还包括资源池标识，所述索引信息与所述资源选择参数的对应关系关联于所述资源池标识对应的资源池。
  33. 如权利要求25至32任一项所述的通信装置，其特征在于，所述资源指示信息承载于第三SCI，所述第三SCI是所述通信单元从所述第二终端设备接收的第一级SCI；或，
    所述资源指示信息承载于第四SCI，所述第四SCI是所述通信单元从所述第二终端设备接收的第二级SCI，所述第四SCI由所述第三SCI指示。
  34. 如权利要求33所述的通信装置，其特征在于，所述第三SCI还包括第二指示信息，所述第二指示信息用于指示所述第三SCI中包括所述资源指示信息，或指示所述第四SCI中包括所述资源指示信息。
  35. 如权利要求34所述的通信装置，其特征在于，所述第二指示信息承载于所述第三 SCI中的预留比特位。
  36. 如权利要求33至35任一项所述的通信装置，其特征在于，所述资源指示信息承载于所述第三SCI中的用于资源分配的字段。
  37. 一种通信装置，其特征在于，包括：
    通信单元和处理单元；
    所述通信单元用于接收来自第一终端设备的索引信息；
    所述处理单元用于根据所述索引信息指示的资源选择参数选择侧行资源；
    所述通信单元还用于向所述第一终端设备发送资源指示信息，所述资源指示信息用于指示所述侧行资源。
  38. 如权利要求37所述的通信装置，其特征在于，所述资源选择参数包括下述至少一项：
    资源预留周期、优先级、初始阈值、阈值提升次数、最大阈值、资源检测相关时长、数据量、包时延预算。
  39. 如权利要求37或38所述的通信装置，其特征在于，所述索引信息承载于第一侧行链路控制信息SCI，所述第一SCI是所述通信单元从所述第一终端设备接收的第一级SCI；或，
    所述索引信息承载于第二SCI，所述第二SCI是所述通信单元从所述第一终端设备接收的第二级SCI，所述第二SCI由所述第一SCI指示。
  40. 如权利要求37至39任一项所述的通信装置，其特征在于，所述第一SCI还包括第一指示信息，所述第一指示信息用于指示所述第一SCI中包括所述索引信息，或指示所述第二SCI中包括所述索引信息。
  41. 如权利要求40所述的通信装置，其特征在于，所述第一指示信息承载于所述第一SCI中的预留比特位。
  42. 如权利要求37至39任一项所述的通信装置，其特征在于，所述第一SCI中格式字段指示所述第二SCI的第一格式时，所述第二SCI中的预留比特位承载所述索引信息；或，所述第一SCI中格式字段指示所述第一格式时，所述第二SCI中的预留比特位承载所述索引信息和第二终端设备的标识；和/或，
    所述第一SCI中格式字段指示所述第二SCI的第二格式时，所述第二SCI由所述索引信息、所述第一终端设备的标识和所述第二终端设备的标识组成。
  43. 如权利要求37至42任一项所述的通信装置，其特征在于，所述处理单元用于确定配置信息；所述配置信息中包括所述索引信息和所述资源选择参数的对应关系。
  44. 如权利要求43所述的通信装置，其特征在于，所述配置信息中包括资源池标识，所述索引信息和所述资源选择参数的对应关系关联于所述资源池标识对应的资源池。
  45. 如权利要求37至44任一项所述的通信装置，其特征在于，所述资源指示信息承载于第三SCI，所述第三SCI是所述通信单元向所述第一终端设备发送的第一级SCI；或，
    所述资源指示信息承载于第四SCI，所述第四SCI是所述通信单元向所述第一终端设备发送的第二级SCI，所述第四SCI由所述第三SCI指示。
  46. 如权利要求45所述的通信装置，其特征在于，所述第三SCI还包括第二指示信息，所述第二指示信息用于指示所述第三SCI中包括所述资源指示信息，或指示所述第四SCI中包括所述资源指示信息。
  47. 如权利要求46所述的通信装置，其特征在于，所述第二指示信息承载于所述第三SCI中的预留比特位。
  48. 如权利要求45至47任一项所述的通信装置，其特征在于，所述资源指示信息承载于所述第三SCI中的用于资源分配的字段。
  49. 一种计算机可读存储介质，其特征在于，所述计算机可读存储介质中存储有计算机程序或指令，当所述计算机程序或指令被通信装置执行时，实现如权利要求1至12、或13至24中任一项所述的方法。
  50. 一种计算机程序产品，其特征在于，所述计算机程序产品包括计算机程序或指令，当所述计算机程序或指令被通信装置执行时，实现如权利要求1至12中任一项所述的方法、或实现如权利要求13至24中任一项所述的方法。
  51. 一种芯片，其特征在于，包括至少一个处理器和接口；
    所述接口，用于读取程序指令或者数据；
    所述至少一个处理器用于执行所述程序指令，以实现如权利要求1至12中任一项所述的方法，或实现如权利要求13至24中任一项所述的方法。
  52. 一种芯片，其特征在于，包括至少一个处理器和存储器；
    所述存储器，用于存储计算机程序；
    所述至少一个处理器用于执行所述计算机程序，以实现如权利要求1至12中任一项所述的方法、或实现如权利要求13至24中任一项所述的方法。
  53. 一种通信系统，其特征在于，包括权利要求25至36任一项的通信装置，以及权利要求37至48任一项的通信装置。
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