WO2021134614A1 - 通信方法、设备及系统 - Google Patents

通信方法、设备及系统 Download PDF

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Publication number
WO2021134614A1
WO2021134614A1 PCT/CN2019/130809 CN2019130809W WO2021134614A1 WO 2021134614 A1 WO2021134614 A1 WO 2021134614A1 CN 2019130809 W CN2019130809 W CN 2019130809W WO 2021134614 A1 WO2021134614 A1 WO 2021134614A1
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WIPO (PCT)
Prior art keywords
terminal device
network
type
message
parameter
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PCT/CN2019/130809
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English (en)
French (fr)
Inventor
王南鑫
彭文杰
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华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to PCT/CN2019/130809 priority Critical patent/WO2021134614A1/zh
Priority to CN201980103053.7A priority patent/CN114830733A/zh
Priority to EP19958502.7A priority patent/EP4068857A4/en
Publication of WO2021134614A1 publication Critical patent/WO2021134614A1/zh
Priority to US17/854,674 priority patent/US20220338093A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W40/00—Communication routing or communication path finding
    • H04W40/02—Communication route or path selection, e.g. power-based or shortest path routing
    • H04W40/22—Communication route or path selection, e.g. power-based or shortest path routing using selective relaying for reaching a BTS [Base Transceiver Station] or an access point
    • 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
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/14—Direct-mode setup
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/005—Discovery of network devices, e.g. terminals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H04W88/04—Terminal devices adapted for relaying to or from another terminal or user
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/16—Interfaces between hierarchically similar devices
    • H04W92/18—Interfaces between hierarchically similar devices between terminal devices

Definitions

  • This application relates to the field of communication technology, in particular to communication methods, equipment and systems.
  • SL communication In order to achieve communication between a remote (remote) user equipment (UE) and a base station, it is necessary to establish a side link (SL) communication between the remote UE and a relay (relay) UE. Before implementing SL communication, it is necessary to implement relay discovery (relay discovery) between the remote UE and the relay UE.
  • relay discovery relay discovery
  • the third generation partnership project (3rd generation partnership project, 3GPP) version 15 release15, R15 specifically designed the corresponding protocol stack on the PC-5 interface for relay discovery, so remote UE and There are two sets of protocol stacks for relay discovery and SL communication between relay UEs.
  • PC5-D is used for relay discovery, including the physical (physical, PHY) layer, media access control (media access control, MAC), and proximity service protocol (prose protocol) layers;
  • PC5-U is used for SL communication, including PHY layer, MAC layer, radio link control (RLC) layer, packet data convergence protocol (PDCP) layer, internet protocol (IP) layer, and application layer.
  • PHY physical
  • PHY media access control
  • MAC media access control
  • Prose protocol proximity service protocol
  • PC5-U is used for SL communication, including PHY layer, MAC layer, radio link control (RLC) layer, packet data convergence protocol (PDCP) layer, internet protocol (IP) layer, and application layer.
  • RLC radio link control
  • PDCP packet data convergence protocol
  • IP internet protocol
  • the relevant discovery message can be indicated by adding an identifier in the L2 frame (that is, the data frame of the MAC layer).
  • the relay (re) selection process will be performed immediately after the relay discovery is completed, and the sidelink discovery reference signal received power (sidelink) measured by the PHY layer is used in this process.
  • discovery reference signal receiving power, SD-RSRP discovery reference signal receiving power
  • the remote UE knows that it is a discovery message at the MAC layer after finishing the PHY layer message processing. Therefore, it needs to issue SL measurement configuration to measure SD-RSRP for relay selection, which often introduces Larger delay.
  • the embodiments of the present application provide a communication method, device, and system, which are used to solve the problem of introducing a large delay due to SD-RSRP measurement in the process of using the existing PC5-U to implement relay discovery in the prior art.
  • a communication method includes: a first terminal device receives first side link control information SCI and a first message from a second terminal device, the first SCI includes a first identifier, and The first identifier is used to indicate that the first message is a discovery message, and the discovery message is used to indicate that the second terminal device is a relay terminal device. The first terminal device determines that the first message is a discovery message according to the first identifier.
  • the large delay that may be introduced in the process of using the existing PC5-U to realize the relay discovery.
  • the second terminal device when the second terminal device sends the first message to the first terminal device, it can simultaneously Send a first SCI including a first identifier to the first terminal device, where the first identifier is used to indicate that the first message is a discovery message. Since the first identifier is carried in the first SCI, after receiving the first SCI, the first terminal device can parse the first SCI at the PHY layer. Therefore, the first terminal device can use the first identifier in the first SCI at the PHY layer. It is learned that the first message is a discovery message, thereby avoiding the large delay that may be introduced in the process of using the existing PC5-U to implement relay discovery in the prior art.
  • a communication method includes: a first terminal device receives a first message from a second terminal device; the first terminal device determines that the first message is based on a first resource for transmitting the first message A discovery message, where the first resource is a resource dedicated to transmitting a discovery message, and the discovery message is used to indicate that the second terminal device is a relay terminal device.
  • the second terminal device sends the first terminal device to the first terminal device on the first resource. news. After receiving the first message, the first terminal device can learn the first resource for transmitting the first message at the PHY layer.
  • the first terminal device can be based on the first resource at the PHY layer.
  • a resource learns that the first message is a discovery message, thereby avoiding the large delay that may be introduced in the process of using the existing PC5-U to implement relay discovery in the prior art.
  • the first message includes a first parameter; the communication method provided in this embodiment of the present application further includes: the first terminal device determines according to the first parameter The second terminal device meets the capability requirement of the first terminal device or the second terminal device does not meet the capability requirement of the first terminal device.
  • future relay communication application scenarios including V2X additionally require capability matching between network devices, the first terminal device, and the second terminal device.
  • the current NR relay communication scenario there is no solution to the problem of matching the capabilities of the network device, the first terminal device, and the second terminal device.
  • the first message in the embodiment of the present application can carry the first parameter, and the first terminal device can determine whether the second terminal device meets the capability requirements of the first terminal device according to the first parameter, thereby solving the problem of the network device and the first terminal device.
  • the first parameter includes an identifier of a network that provides services for the second terminal device; correspondingly, the first terminal device, according to the first parameter, Determining that the second terminal device satisfies the capability requirements of the first terminal device includes: the first terminal device determines that the network that provides services for the second terminal device is in the first terminal device according to the identifier of the network that provides services for the second terminal device.
  • the connection authority of a terminal device That is, in the embodiment of the present application, the capability requirement of the first terminal device may include the connection authority requirement.
  • the first parameter further includes network slicing capability information of the second terminal device; it is determined that the second terminal device satisfies the capability of the first terminal device
  • the requirement further includes: the first terminal device determines, according to the slicing capability information of the second terminal device, that the slicing capability of the second terminal device meets the slicing capability requirement of the first terminal device. That is, in this embodiment of the present application, the capability requirement of the first terminal device may also include the slicing capability requirement.
  • the first parameter further includes first indication information
  • the first indication information indicates that the network device accessed by the second terminal device is of the first type
  • the network device or the second type of network device; determining that the second terminal device satisfies the capability requirements of the first terminal device further includes: when the first terminal device only supports connection establishment of the network device is the first type of network device , The first terminal device determines, according to the first indication information, whether the network device accessed by the second terminal device is the first type of network device; or, when the first terminal device only supports connection establishment, the network device is the first type of network device; In the case of the second type of network device, the first terminal device determines that the network device accessed by the second terminal device is the second type of network device according to the first indication information; or, when the first terminal device supports the connection establishment at the same time
  • the first terminal device determines according to the first indication information that the network device accessed
  • the first parameter It when the first indication information indicates that the network device accessed by the second terminal device is the first type of network device, the first parameter It also includes the core network type to which the network device accessed by the second terminal device is connected. Wherein, the core network type to which the network device accessed by the second terminal device is connected can be used for subsequent relay selection.
  • a communication method includes: a first terminal device receives a first message from a second terminal device, the first message includes a first parameter; the first terminal device according to the first parameter, It is determined that the second terminal device meets the capability requirement of the first terminal device or the second terminal device does not meet the capability requirement of the first terminal device.
  • future relay communication application scenarios including V2X additionally require capability matching between network devices, the first terminal device, and the second terminal device.
  • the current NR relay communication scenario there is no solution to the problem of matching the capabilities of the network device, the first terminal device, and the second terminal device.
  • the first message in the embodiment of the present application can carry the first parameter, and the first terminal device can determine whether the second terminal device meets the capability requirements of the first terminal device according to the first parameter, thereby solving the problem of the network device and the first terminal device.
  • the related description of the first parameter and the manner in which the first terminal device determines that the second terminal device satisfies the capability requirement of the first terminal device according to the first parameter may refer to the above-mentioned first aspect or second aspect, I won't repeat them here.
  • the communication method provided in an embodiment of the present application further includes: the first terminal device sends a second message to the second terminal device, and the first terminal device sends a second message to the second terminal device.
  • the second message carries a second parameter, and the second parameter is used to determine that the second terminal device meets the capability requirement of the first terminal device.
  • future relay communication application scenarios including V2X additionally require capability matching between network devices, the first terminal device, and the second terminal device.
  • the second message in the embodiment of the present application may carry a second parameter, and the second parameter is used to determine that the second terminal device meets the capability requirements of the first terminal device, thereby solving the problem of the network device, the first terminal device, and the first terminal device. 2. The problem of matching the capabilities of terminal equipment.
  • the second parameter includes a list of identities of networks that the first terminal device is allowed to access. That is, in the embodiment of the present application, the capability requirement of the first terminal device may include the connection authority requirement.
  • the second parameter further includes at least one of second indication information or the slicing capability requirement of the first terminal device, the first The second indication information indicates that the network device that the first terminal device supports to establish a connection is a network device of the first type and/or a network device of the second type. That is, in the embodiment of the present application, the capability requirement of the first terminal device may also include at least one of a slicing capability requirement or a type requirement of a network device supporting connection establishment.
  • the first terminal device sends a second message to the second terminal device, including: the first terminal device sends the second message to the second terminal device on the second resource.
  • the second terminal device sends the second message, and the second resource is a resource dedicated to transmitting the discovery message.
  • the first terminal device After the first terminal device receives the second message, it can learn the second resource for transmitting the second message at the PHY layer, and the first resource is the resource dedicated to transmitting the discovery message, so the second terminal device can be based on the PHY layer.
  • the second resource learns that the second message is a discovery message.
  • the communication method provided in this embodiment of the present application further includes: the first terminal device sends a second SCI to the second terminal device, and the first terminal device sends a second SCI to the second terminal device.
  • the two SCI includes a first identifier, and the first identifier is used to indicate that the second message is a discovery message. Since the first identifier is carried in the second SCI, after receiving the second SCI, the second terminal device can parse the second SCI at the PHY layer, so the second terminal device can use the first identifier in the second SCI at the PHY layer. It is learned that the second message is a discovery message.
  • the communication method provided in the embodiment of the present application further includes: the first terminal device selects a device that satisfies the first terminal device according to a preset criterion.
  • the target second terminal device is selected from the plurality of second terminal devices with capability requirements.
  • the first terminal device may select the target second terminal device from the second terminal devices that meet the capability requirements of the first terminal device according to a preset criterion, thereby solving the problem of selecting the target second terminal device.
  • the preset criterion includes a first preset criterion, and the first preset criterion is used to determine one or Multiple second terminal devices.
  • one or more second terminal devices with a higher priority may be the aforementioned target second terminal devices.
  • the first preset criterion includes one or more of the following: the priority of the second terminal device accessing the first network device If the level is higher, the first network device is the network device accessed by the first terminal device; the second terminal device whose core network type is the target core network type to which the accessed network device is connected has a higher priority; the resource pool The second terminal device whose channel busyness is not greater than the first threshold has a higher priority; the second terminal device whose power measurement value is not less than the second threshold has a higher priority; or, when the first terminal device supports connection establishment at the same time
  • the network device of is the first type of network device or the second type of network device, the second terminal device that accesses the target type of network device has a higher priority, and the target type is the default network device of the first terminal device Type; or, the target type is the network device type corresponding to the high-priority service of the first terminal device.
  • the preset criterion further includes a second preset criterion, and the second preset criterion is used to select a higher priority Or select the target second terminal device from a plurality of second terminal devices.
  • the second preset criterion includes: the target second terminal device is the one or more second terminals with higher priority The second terminal device whose corresponding resource pool channel is the least busy in the device; or, the target second terminal device is the second terminal device with the largest corresponding power measurement value among the one or more second terminal devices with higher priority .
  • the preset criterion includes: the target second terminal device is a plurality of second terminals that meet the capability requirements of the first terminal device The second terminal device corresponding to the resource pool channel in the device is the least busy; or, the target second terminal device is the second terminal device with the largest corresponding power measurement value among the plurality of second terminal devices that meet the capability requirements of the first terminal device Terminal Equipment.
  • the first type is Long Term Evolution LTE
  • the second type is New Air Interface NR.
  • the first type of network equipment is an LTE system evolved node eNB
  • the second type of network equipment is an NR system evolved node gNB.
  • a communication method includes: a second terminal device acquires first side uplink control information SCI, where the first SCI includes a first identifier, and the first identifier is used to indicate that the first message is A discovery message, where the discovery message is used to indicate that the second terminal device is a relay terminal device; the second terminal device sends the first SCI and the first message to the first terminal device.
  • the technical effect of the fourth aspect can be referred to the above-mentioned first aspect, which will not be repeated here.
  • a communication method includes: a second terminal device determines a first resource, the first resource is a resource dedicated to transmitting a discovery message, and the discovery message is used to indicate that the second terminal device is in the middle Following the terminal device; the second terminal device sends a first message to the first terminal device on the first resource.
  • the technical effect of the fifth aspect can be referred to the second aspect described above, which will not be repeated here.
  • the first message includes a first parameter
  • the first parameter is used to determine that the second terminal device meets the capability requirement of the first terminal device Or the second terminal device does not meet the capability requirements of the first terminal device.
  • the first parameter includes an identifier of a network that provides services for the second terminal device.
  • the first parameter further includes at least one of first indication information or network slicing capability information of the second terminal device, and the first indication information Indicate that the network device accessed by the second terminal device is a network device of the first type or a network device of the second type.
  • the first parameter It when the first indication information indicates that the network device accessed by the second terminal device is the first type of network device, the first parameter It also includes the core network type to which the network device accessed by the second terminal device is connected.
  • a communication method includes: a second terminal device determines a first parameter; the second terminal device sends a first message to the first terminal device, the first message includes the first parameter, and the first parameter A parameter is used to determine that the second terminal device meets the capability requirement of the first terminal device or the second terminal device does not meet the capability requirement of the first terminal device.
  • the technical effect of the sixth aspect can be referred to the above-mentioned third aspect, which will not be repeated here.
  • the related description of the first parameter and the manner in which the first terminal device determines that the second terminal device satisfies the capability requirement of the first terminal device according to the first parameter may refer to the above-mentioned first aspect, which will not be omitted here. Go into details.
  • the communication method provided in the embodiment of the present application further includes: a second terminal device receives a second message from the first terminal device, The second message carries a second parameter; the second terminal device determines that the second message is a discovery message; the second terminal device determines that the second terminal device meets the capability requirement of the first terminal device according to the second parameter.
  • the communication method provided in this embodiment of the present application further includes: a second terminal device receives a second SCI from the first terminal device,
  • the second SCI includes a first identifier, and the first identifier is used to indicate that the second message is a discovery message; the second terminal device determines that the second message is a discovery message according to the first identifier.
  • the method further includes: the second terminal device determines that the second message is a discovery message according to the second resource for transmitting the second message ,
  • the second resource is a resource dedicated to transmitting discovery messages.
  • the second parameter includes an identification list of the network that the first terminal device is allowed to access; accordingly, the second terminal device is based on The second parameter, determining that the second terminal device meets the capability requirements of the first terminal device, includes: the second terminal device determines that the second terminal device is the second terminal device according to the identification list of the network to which the first terminal device is allowed to access The service network is within the connection authority of the first terminal device.
  • the second parameter further includes the slicing capability requirement of the first terminal device; the second terminal device determines that the second terminal device satisfies
  • the capability requirement of the first terminal device further includes: the second terminal device determines that the slicing capability of the second terminal device meets the slicing capability requirement of the first terminal device according to the slicing capability requirement of the first terminal device.
  • the second parameter further includes second indication information
  • the second indication information indicates that the first terminal device supports a network to establish a connection
  • the device is a first type of network device and/or a second type of network device
  • the second terminal device determining that the second terminal device satisfies the capability requirement of the first terminal device further includes: when the second indication information indicates the first terminal device When the terminal device only supports the establishment of a connection with a network device of the first type, the second terminal device determines that the network device accessed by the second terminal device is the network device of the first type; or, when the second indication When the information indicates that the network device that the first terminal device only supports to establish a connection is a network device of the second type, the second terminal device determines that the network device accessed by the second terminal device is the network device of the second type; or, When the second indication information indicates that the network device that the first terminal device supports to establish a connection at the same time is the network device of the first type
  • a relay selection method includes: a first terminal device determines a plurality of second terminal devices that meet the capability requirements of the first terminal device; The criterion selects the target second terminal device from a plurality of second terminal devices that meet the capability requirements of the first terminal device.
  • the first terminal device may select the target second terminal device from the second terminal devices that meet the capability requirements of the first terminal device according to a preset criterion, thereby solving the problem of selecting the target second terminal device.
  • the related description of the preset criterion can refer to the above-mentioned first aspect, which will not be repeated here.
  • a communication device for implementing the above-mentioned various methods.
  • the communication device includes a module, unit, or means corresponding to the foregoing method, and the module, unit, or means can be realized by hardware, software, or by hardware executing corresponding software.
  • the hardware or software includes one or more modules or units corresponding to the above-mentioned functions.
  • a communication device including: a processor and an interface circuit, the interface circuit is used to receive signals from other communication devices other than the communication device and transmit them to the processor or send signals from the processor to the communication device.
  • the processor is used to implement any of the foregoing methods through logic circuits or execution code instructions.
  • the communication device further includes a memory.
  • the memory is used to store computer instructions.
  • the processor executes the instructions, the communication device executes the method described in any of the above aspects.
  • a communication device including: a processor; the processor is configured to couple with a memory, and after reading an instruction in the memory, execute the method according to any of the foregoing aspects according to the instruction.
  • the communication device further includes a memory for storing necessary program instructions and data.
  • the communication device is a chip system, it may be composed of a chip, or may include a chip and other discrete devices.
  • a computer-readable storage medium stores an instruction, and when the instruction is executed by a communication device, the communication device realizes the method described in any one of the above aspects.
  • a computer program product containing instructions is provided.
  • the instructions When the instructions are executed by a communication device, the communication device realizes the method described in any of the above aspects.
  • a communication system which includes a communication device for implementing the method described in the first aspect and a communication device for implementing the method described in the fourth aspect; or, the communication system It includes a communication device for implementing the method described in the above second aspect and a communication device for performing the method described in the fifth aspect; or, the communication system includes a communication device for implementing the method described in the third aspect.
  • Figure 1 is a schematic diagram of the protocol stack used for relay discovery and SL communication in the existing R15;
  • FIG. 2 is a schematic diagram of the architecture of a communication system provided by an embodiment of the application.
  • FIG. 3 is a first structural diagram of a communication device provided by an embodiment of this application.
  • FIG. 4 is a schematic diagram of a scenario for SL communication provided by an embodiment of the application.
  • FIG. 5 is a first flowchart of a communication method provided by an embodiment of this application.
  • FIG. 6 is a second schematic flowchart of a communication method provided by an embodiment of this application.
  • FIG. 7 is a third schematic flowchart of a communication method provided by an embodiment of this application.
  • FIG. 8 is a fourth schematic flowchart of a communication method provided by an embodiment of this application.
  • FIG. 9 is a second structural diagram of a communication device provided by an embodiment of this application.
  • FIG. 10 is a third structural diagram of a communication device provided by an embodiment of this application.
  • At least one item (a) refers to any combination of these items, including any combination of a single item (a) or a plurality of items (a).
  • 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 .
  • words such as “first” and “second” are used to distinguish the same or similar items with substantially the same function and effect.
  • words such as “first” and “second” do not limit the quantity and order of execution, and words such as “first” and “second” do not limit the difference.
  • words such as “exemplary” or “for example” are used as examples, illustrations, or illustrations. Any embodiment or design solution described as “exemplary” or “for example” in the embodiments of the present application should not be construed as being more preferable or advantageous than other embodiments or design solutions.
  • words such as “exemplary” or “for example” are used to present related concepts in a specific manner to facilitate understanding.
  • LTE long term evolution
  • FDD frequency division duplex
  • TDD time division duplex
  • UMTS universal mobile telecommunication system
  • WiMAX worldwide interoperability for microwave access
  • 5G fifth generation
  • NR new radio
  • the communication system can also be a public land mobile network (PLMN) network, a device-to-device (D2D) communication system, and a machine-to-machine (M2M) communication system.
  • PLMN public land mobile network
  • D2D device-to-device
  • M2M machine-to-machine
  • V2X Vehicle to everything
  • IoT Internet of Things
  • the communication system 20 includes a first terminal device, a second terminal device, and a network device.
  • the second terminal device is within the service range of the network device and supports providing relay services for nearby users, so it can also be referred to as a relay terminal device.
  • the communication quality between the first terminal device and the network device is not good or is not within the service range of the network device, and the relay function of the second terminal device is selected to realize the communication. Therefore, it can also be called a remote terminal device.
  • a remote terminal device Here is a unified description. No longer.
  • the terminal device in the embodiment of the present application may only support LTE services, only NR services, or both.
  • the relay service between two terminal devices may also only support LTE, only NR, or both, which is not specifically limited in the embodiment of the present application.
  • the terminal devices in the embodiments of the present application may be various types of devices that provide users with voice and/or data connectivity.
  • the terminal device may communicate with the core network via an access network, such as a radio access network (RAN), and exchange voice and/or data with the RAN.
  • an access network such as a radio access network (RAN)
  • RAN radio access network
  • the terminal device may include a UE, a wireless terminal, a mobile terminal, a subscriber unit (subscriber unit), a subscriber station (subscriber station), a mobile station (mobile station), a mobile station (mobile), and a remote station (remote station) , Access point (access point, AP), remote terminal (remote terminal), access terminal (access terminal), user terminal (user terminal), user agent (user agent), user equipment (user device), mobile phone ( (Or “cellular” phones), computers with mobile terminals, portable, pocket-sized, handheld, computer-built or in-vehicle mobile devices, wearable devices, personal communication service (PCS) phones, cordless phones , Session initiation protocol (SIP) phones, wireless local loop (WLL) stations, personal digital assistants (PDA), smart bracelets, smart watches, terminals in the future 5G network Equipment or terminal equipment in the future evolved PLMN or terminal equipment in the future Internet of Vehicles, etc.
  • PCS personal communication service
  • SIP Session initiation protocol
  • terminal devices may also include restricted devices, such as devices with low power consumption, or devices with limited storage capabilities, or devices with limited computing capabilities, such as barcodes, radio frequency identification (RFID), sensors, Information sensing equipment such as global positioning system (GPS) and laser scanners.
  • restricted devices such as devices with low power consumption, or devices with limited storage capabilities, or devices with limited computing capabilities, such as barcodes, radio frequency identification (RFID), sensors, Information sensing equipment such as global positioning system (GPS) and laser scanners.
  • RFID radio frequency identification
  • GPS global positioning system
  • the terminal device can also be a drone device.
  • the chips applied in the above-mentioned devices may also be referred to as terminal devices.
  • the wireless terminal may be a mobile phone, a tablet computer, a computer with wireless transceiving function, virtual reality terminal equipment, augmented reality terminal equipment, wireless terminal in industrial control, unmanned driving Wireless terminals in remote operations, wireless terminals in smart grids, wireless terminals in transportation safety, wireless terminals in smart cities, and wireless terminals in smart homes.
  • wearable devices can also be referred to as wearable smart devices. It is a general term for using wearable technology to intelligently design daily wear and develop wearable devices, such as glasses, Gloves, watches, clothing and shoes, etc.
  • a wearable device is a portable device that is directly worn on the body or integrated into the user's clothes or accessories. Wearable devices are not only a kind of hardware device, but also realize powerful functions through software support, data interaction, and cloud interaction.
  • wearable smart devices include full-featured, large-sized, complete or partial functions that can be achieved without relying on smart phones, such as smart watches or smart glasses, and only focus on a certain type of application function, and need to cooperate with other devices such as smart phones.
  • the terminal device can also be a terminal device in the IoT system.
  • IoT is an important part of the development of information technology in the future. Its main technical feature is to connect objects to the network through communication technology to realize man-machine Interconnection, an intelligent network of interconnection of things.
  • the IoT technology can achieve massive connections, deep coverage, and power saving of the terminal through, for example, narrowband (NB) technology.
  • NB narrowband
  • the terminal equipment may also include sensors such as smart printers, train detectors, gas stations, etc.
  • the main functions include collecting data (part of the terminal equipment), receiving control information and downlink data from access network equipment, and Send electromagnetic waves to transmit uplink data to the access network equipment.
  • the network device in the embodiment of the present application may be any communication device that has a wireless transceiving function and is used to communicate with a terminal device.
  • the network equipment includes but not limited to: radio network controller (RNC), node B (Node B, NB), base station controller (BSC), base transceiver station (base transceiver station, BTS) , Home base station (home evolved NodeB, HeNB, or home Node B, HNB), baseband unit (BBU), access point (AP) in wireless fidelity (wireless fidelity, WIFI) system, wireless Relay node, wireless backhaul node, transmission point (TP) or TRP, etc.
  • RNC radio network controller
  • Node B Node B
  • BSC base station controller
  • BTS base transceiver station
  • BTS base transceiver station
  • BTS Home base station
  • home evolved NodeB, HeNB, or home Node B, HNB baseband unit
  • BBU baseband unit
  • AP access point
  • wireless fidelity wireless
  • the network equipment may also be an evolved NB (evolved NB, eNB) in the LTE system, a next-generation NB (gNB) or TRP or TP in the NR system, or one or a group of gNB in the NR system ( Including multiple antenna panels) antenna panels.
  • the network device may also be a network node constituting a gNB or TP, such as a BBU, or a distributed unit (DU).
  • the gNB may include a centralized unit (CU) and a DU.
  • the gNB may also include an active antenna unit (AAU).
  • the CU implements part of the functions of gNB, and the DU implements part of the functions of gNB.
  • the CU is responsible for processing non-real-time protocols and services, and implements radio resource control (radio resource control, RRC), and functions of the PDCP layer.
  • RRC radio resource control
  • DU is responsible for processing physical layer protocols and real-time services, and realizes the functions of RLC layer, MAC layer and PHY layer.
  • AAU realizes some physical layer processing functions, radio frequency processing and related functions of active antennas.
  • the network device may be a device including one or more of the CU node, the DU node, and the AAU node.
  • the network device and the terminal device in the embodiment of the present application may communicate through a licensed spectrum, or communicate through an unlicensed spectrum, or communicate through a licensed spectrum and an unlicensed spectrum at the same time.
  • Network equipment and terminal equipment can communicate through a frequency spectrum below 6 GHz (gigahertz, GHz), communicate through a frequency spectrum above 6 GHz, and communicate using a frequency spectrum below 6 GHz and a frequency spectrum above 6 GHz at the same time.
  • the embodiment of the present application does not limit the spectrum resource used between the network device and the terminal device.
  • the terminal equipment or network equipment in the embodiments of the present application can be deployed on land, including indoor or outdoor, handheld or vehicle-mounted; it can also be deployed on the water; it can also be deployed on aircraft, balloons, and satellites in the air .
  • the embodiments of the present application do not limit the application scenarios of the terminal device or the network device.
  • the related functions of the terminal device or the network device in the embodiments of the present application may be implemented by one device, or jointly implemented by multiple devices, or implemented by one or more functional modules in one device.
  • the application embodiment does not specifically limit this. It is understandable that the above functions can be network elements in hardware devices, software functions running on dedicated hardware, or a combination of hardware and software, or instantiated on a platform (for example, a cloud platform) Virtualization function.
  • FIG. 3 is a schematic structural diagram of a communication device 300 provided by an embodiment of this application.
  • the communication device 300 includes one or more processors 301, a communication line 302, and at least one communication interface (in FIG. 3, the communication interface 304 and one processor 301 are taken as an example for illustration), optional
  • the memory 303 may also be included.
  • the processor 301 may be a central processing unit (CPU), a microprocessor, an application-specific integrated circuit (ASIC), or one or more integrated circuits used to control the execution of the program of this application Circuit.
  • CPU central processing unit
  • ASIC application-specific integrated circuit
  • the communication line 302 may include a path for connecting different components.
  • the communication interface 304 may be a transceiver module for communicating with other devices or communication networks, such as Ethernet, RAN, wireless local area networks (WLAN), and so on.
  • the transceiver module may be a device such as a transceiver or a transceiver.
  • the communication interface 304 may also be a transceiver circuit located in the processor 301 to implement signal input and signal output of the processor.
  • the memory 303 may be a device having a storage function. For example, it can be read-only memory (ROM) or other types of static storage devices that can store static information and instructions, random access memory (RAM), or other types that can store information and instructions Dynamic storage devices can also be electrically erasable programmable read-only memory (EEPROM), compact disc read-only memory (CD-ROM), or other optical disk storage, optical disc storage ( Including compact discs, laser discs, optical discs, digital versatile discs, Blu-ray discs, etc.), magnetic disk storage media or other magnetic storage devices, or can be used to carry or store desired program codes in the form of instructions or data structures and can be stored by a computer Any other media taken, but not limited to this.
  • the memory may exist independently, and is connected to the processor through the communication line 302. The memory can also be integrated with the processor.
  • the memory 303 is used to store computer-executed instructions for executing the solution of the application, and the processor 301 controls the execution.
  • the processor 301 is configured to execute computer-executable instructions stored in the memory 303, so as to implement the communication method provided in the embodiment of the present application.
  • the processor 301 may also perform processing-related functions in the communication method provided in the following embodiments of the present application, and the communication interface 304 is responsible for communicating with other devices or communication networks.
  • the communication interface 304 is responsible for communicating with other devices or communication networks.
  • the computer execution instructions in the embodiments of the present application may also be referred to as application program codes, which are not specifically limited in the embodiments of the present application.
  • the processor 301 may include one or more CPUs, such as CPU0 and CPU1 in FIG. 3.
  • the communication device 300 may include multiple processors, such as the processor 301 and the processor 308 in FIG. 3. Each of these processors can be a single-CPU (single-CPU) processor or a multi-core (multi-CPU) processor.
  • the processor here may refer to one or more devices, circuits, and/or processing cores for processing data (for example, computer program instructions).
  • the communication apparatus 300 may further include an output device 305 and an input device 306.
  • the output device 305 communicates with the processor 301 and can display information in a variety of ways.
  • the aforementioned communication device 300 may be a general-purpose device or a dedicated device.
  • the communication device 300 may be a desktop computer, a portable computer, a network server, a personal digital assistant (PDA), a mobile phone, a tablet computer, a wireless terminal device, an embedded device, or a device with a similar structure in FIG. 3.
  • PDA personal digital assistant
  • the embodiment of the present application does not limit the type of the communication device 300.
  • the embodiments of this application are applicable to all scenarios of SL communication.
  • the current SL communication includes the three scenarios shown in Figure 4.
  • the three scenarios are introduced as follows:
  • Scenario One and Scenario One are LTE SL relay communication scenarios under LTE eNB.
  • the eNB that is, the network device in the communication system shown in FIG. 2
  • the relay terminal device that is, the second terminal device in the communication system shown in FIG. 2
  • the LTE Uu port and the relay The terminal device communicates with the remote terminal device (that is, the second terminal device in the communication system shown in Figure 2) through the LTE SL protocol, that is, the core network type to which the remote terminal device is connected is an evolved packet core network (evolved packet core, EPC).
  • EPC evolved packet core network
  • Scenario two and scenario two are NR SL relay communication scenarios under NR gNB.
  • the gNB that is, the network device in the communication system shown in Figure 2
  • the relay terminal device that is, the second terminal device in the communication system shown in Figure 2
  • the NR Uu port and the relay The terminal device communicates with the remote terminal device (that is, the second terminal device in the communication system shown in Figure 2) through the NR SL protocol, that is, the core network type to which the remote terminal device is connected is 5G core network (5G core, 5GC) .
  • 5G core network 5G core network
  • Scenario three and scenario three are NR SL relay communication scenarios under an evolved LTE (evolved LTE, eLTE) eNB.
  • the eNB that is, the network device in the communication system shown in FIG. 2
  • the relay terminal device that is, the second terminal device in the communication system shown in FIG. 2
  • the LTE Uu port and the relay The terminal device communicates with the remote terminal device (that is, the second terminal device in the communication system shown in FIG. 2) through the NR SL protocol, that is, the core network type to which the remote terminal device is connected is 5GC.
  • a communication method provided by an embodiment of this application includes the following steps:
  • the second terminal device obtains the first SCI.
  • the first SCI includes a first identifier, the first identifier is used to indicate that the first message is a discovery message, and the discovery message is used to indicate that the second terminal device is a relay terminal device.
  • the second terminal device sends the first SCI and the first message to the first terminal device.
  • the first terminal device receives the first SCI and the first message from the second terminal device.
  • the first message in the embodiment of the present application may be an announcement message.
  • the second terminal device may broadcast the first message and the first SCI in a broadcast manner, and a nearby first terminal device may receive the first message and the first SCI broadcast by the second terminal device.
  • the first message in the embodiment of the present application may include a first parameter, and the first parameter is used to determine whether the second terminal device meets the capability requirement of the first terminal device.
  • the capability requirement may be, for example, a slicing capability requirement, a connection permission requirement, or a type requirement of a network device supporting connection establishment, etc., which is not specifically limited in the embodiment of the present application.
  • the first parameter in the embodiment of the present application may include the identity of the network that provides services for the second terminal device, and the identity of the network that provides services for the second terminal device is used to determine whether the second terminal device meets the requirements of the first terminal device. Connection permission requirements.
  • the first parameter in the embodiment of the present application may further include at least one of the network slicing capability information of the second terminal device or the first indication information, and the first indication information indicates that the network device accessed by the second terminal device is The first type of network equipment or the second type of network equipment.
  • the network slicing capability information of the second terminal device is used to determine whether the second terminal device meets the slicing capability requirement of the first terminal device
  • the first indication information is used to determine whether the second terminal device meets the requirements of the first terminal device to support connection establishment. Types of network equipment requirements.
  • the first parameter when the first indication information indicates that the network device accessed by the second terminal device is a network device of the first type, the first parameter may also include the network device connected by the second terminal device.
  • the type of core network when the first indication information indicates that the network device accessed by the second terminal device is a network device of the first type, the first parameter may also include the network device connected by the second terminal device.
  • the type of core network when the first indication information indicates that the network device accessed by the second terminal device is a network device of the first type, the first parameter may also include the network device connected by the second terminal device.
  • the type of core network is not limited to the first indication information.
  • the first type of network device may be, for example, an eNB
  • the second type of network device may be, for example, a gNB.
  • the core network type to which the network device accessed by the second terminal device is connected may be, for example, EPC or 5GC, which is described here in a unified manner , I won’t repeat it below.
  • the first indication information indicates that the network device accessed by the second terminal device is the first type of network device and the first indication information indicates that the RRC connection type of the second terminal device is the first type. Equivalently, the first indication information indicating that the network device accessed by the second terminal device is the second type of network device is equivalent to the first indication information indicating that the RRC connection type of the second terminal device is the second type.
  • the first indication information indicates that the network device that the second terminal device accesses is an eNB, which also means that the RRC connection type of the second terminal device is LTE;
  • the first indication information Indicate that the network device accessed by the second terminal device is gNB, which also means that the RRC connection type of the second terminal device is NR.
  • the first indication information indicates that the RRC connection type of the second terminal device is LTE, it also means that the network device that the second terminal device accesses is an eNB; assuming that the first indication information indicates The RRC connection type of the second terminal device is NR, which also means that the network device that the second terminal device accesses is a gNB, which is described here in a unified manner, and will not be repeated here.
  • the announcement message in the embodiment of the present application may also carry some existing parameters, such as a relay service code (relay service code). service code), proximity service relay terminal identification or information of the message source terminal, etc.
  • the relay service code indicates a type of public safety service
  • the proximity service relay terminal identification is assigned by the second terminal device to various relay service codes
  • the information of the message source terminal is based on the home public land mobile network (HPLMN) or the third-party public safety provider’s application server’s policy.
  • the user information ID (User Info ID) is assigned to the device. Reference can be made to the existing implementation, which will not be repeated here.
  • the first terminal device determines that the first message is a discovery message according to the first identifier.
  • the first terminal device since the first identifier is carried in the first SCI, after the first terminal device receives the first SCI, it can parse the first SCI at the PHY layer. Therefore, the first terminal device can analyze the first SCI at the PHY layer according to the The first identifier in the SCI learns that the first message is a discovery message.
  • the first terminal device determines, according to the first parameter, whether the second terminal device meets the capability requirement of the first terminal device.
  • the first terminal device determines that the second terminal device meets the capability requirements of the first terminal device according to the first parameter, which may include: the first terminal device according to the network that provides services for the second terminal device , It is determined that the network that provides services for the second terminal device is within the connection authority of the first terminal device.
  • the first terminal device determining that the second terminal device meets the capability requirement of the first terminal device may also include: the first terminal device according to the second terminal device The slicing capability information of the second terminal device determines that the slicing capability of the second terminal device meets the slicing capability requirement of the first terminal device.
  • the first terminal device determining that the second terminal device satisfies the capability requirement of the first terminal device also includes: when the first terminal device only supports connection establishment of the network device as the first terminal device Type of network equipment, the first terminal equipment determines, according to the first indication information, that the network equipment accessed by the second terminal equipment is the first type of network equipment; or, when the first terminal equipment only supports connection establishment, the network equipment is the second type of network equipment.
  • the first terminal equipment determines, according to the first indication information, that the network equipment accessed by the second terminal equipment is the second type of network equipment; or, when the first terminal equipment also supports connection establishment, the network equipment is the first
  • the type of network device is the second type of network device
  • the first terminal device determines, according to the first indication information, that the network device accessed by the second terminal device is the first type of network device or the second type of network device.
  • that the first terminal device determines that the second terminal device does not meet the capability requirements of the first terminal device according to the first parameter may include: the first terminal device provides services for the second terminal device according to The network identifier determines that the network that provides services for the second terminal device is not within the connection authority of the first terminal device.
  • the first terminal device determines that the second terminal device does not meet the capability requirement of the first terminal device according to the first parameter, which may include: the first terminal device According to the identity of the network that provides services for the second terminal device, it is determined that the network that provides services for the second terminal device is within the connection authority of the first terminal device, but the first terminal device determines the first terminal device according to the slice capability information of the second terminal device. The slicing capability of the second terminal device does not meet the slicing capability requirement of the first terminal device.
  • the first terminal device determines that the second terminal device does not meet the capability requirements of the first terminal device according to the first parameter, which may include: The identification of the network that the device provides services to determine that the network that provides services for the second terminal device is within the connection authority of the first terminal device, but when the first terminal device only supports the connection establishment of the network device as the first type of network device, The first terminal device determines according to the first indication information that the network device accessed by the second terminal device is a network device of the second type; or, when the network device that the first terminal device only supports connection establishment is a network device of the second type, The first terminal device determines, according to the first indication information, that the network device accessed by the second terminal device is a network device of the first type.
  • steps S501-S504 are described by taking a second terminal device interacting with the first terminal device as an example.
  • the interaction process between any one of the second terminal devices and the first terminal device can refer to the above steps S501-S504, which will not be repeated here.
  • the communication method provided in the embodiment of the present application may further include a relay selection process as shown in step S505:
  • the first terminal device selects the target second terminal device from the second terminal devices meeting the capability requirements of the first terminal device according to the preset criterion.
  • the preset criterion may include a first preset criterion, and the first preset criterion is used to determine one or more second terminal devices with a higher priority.
  • one or more second terminal devices with a higher priority are the aforementioned target second terminal devices.
  • the preset criterion may also include a second preset criterion, and the second preset criterion is used to select the target second terminal device from one or more second terminal devices with higher priority.
  • the first preset criterion may include one or more of the following:
  • the second terminal device that accesses the first network device has a higher priority, and the first network device is the network device that the first terminal device accesses.
  • the second terminal device whose core network type is the target core network type to which the accessed network device is connected has a higher priority.
  • the second terminal device whose resource pool channel busyness is not greater than the first threshold has a higher priority.
  • the second terminal device whose power measurement value is not less than the second threshold has a higher priority.
  • the network device that the first terminal device supports to establish a connection at the same time is the first type of network device or the second type of network device
  • the priority of the second terminal device that accesses the target type of network device is higher, and the target type It is the default network device type of the first terminal device; or, the target type is the network device type corresponding to the high-priority service of the first terminal device.
  • the network device accessed by the selected target second terminal device can be made to be the same as the network accessed by the first terminal device.
  • the devices are the same (assuming that they are all the network device 1), so that the first terminal device supports a dual-connection scenario that simultaneously establishes direct communication with the network device 1 and relay communication based on the second terminal device.
  • the target core network type in the embodiment of the present application by setting the core network type connected to the network device to be connected to the second terminal device of the target core network type, the priority of the second terminal device is higher, so that the selected target second terminal device is connected to the core
  • the network type is the target core network type.
  • the target core network type in the embodiment of the present application may be selected as 5GC.
  • the resource pool channel busyness for example, the channel busy ratio (CBR)
  • CBR channel busy ratio
  • the priority of the second terminal device whose power measurement value (for example, the SD-RSRP value) is not less than the second threshold value is set to be higher, so that the power corresponding to the selected target second terminal device can be made
  • the measured value is not less than the second threshold.
  • the power measurement value corresponding to the selected target second terminal device is relatively high, so that the quality of the communication channel between the first terminal device and the second terminal device can be higher.
  • the second terminal device that accesses the target type of network device is set The priority of is higher, so that the selected target second terminal device is the second terminal device that accesses the target type of network device.
  • the target type is the default network device type of the first terminal device
  • the target second terminal device is the second terminal device connected to the eNB
  • the target second terminal device is the second terminal device connected to the gNB.
  • the target type is the network device type corresponding to the high-priority service of the first terminal device
  • the target second terminal The device is the second terminal device connected to the eNB
  • the target second terminal device is the second terminal device connected to the gNB.
  • the second preset criterion may include:
  • the target second terminal device is one or more second terminal devices with higher priority and the corresponding resource pool channel is the least busy second terminal device; or, the target second terminal device is one or more second terminal devices with higher priority.
  • the target second terminal device when the target second terminal device is the second terminal device whose resource pool channel is the least busy among one or more second terminal devices with higher priority, the target second terminal device is further determined based on the second preset criterion.
  • the second terminal device can enable the first terminal device to establish a connection with the second terminal device with the least busy channel, so that the first terminal device can obtain the relay communication resource scheduling most efficiently.
  • the second terminal device with the largest corresponding power measurement value may be further determined based on the second preset criterion. This enables the first terminal device to establish a connection with the second terminal device with the best channel quality, so that the relay communication channel quality of the first terminal device is the best.
  • the preset criteria may include: the target second terminal device is the second terminal device whose corresponding resource pool channel is the least busy among the plurality of second terminal devices meeting the capability requirements of the first terminal device; or, the target first terminal device The second terminal device is the second terminal device with the largest corresponding power measurement value among the plurality of second terminal devices meeting the capability requirements of the first terminal device.
  • the second terminal device when the second terminal device sends the first message to the first terminal device , the first SCI including the first identifier may be sent to the first terminal device at the same time, and the first identifier is used to indicate that the first message is a discovery message. Since the first identifier is carried in the first SCI, after receiving the first SCI, the first terminal device can parse the first SCI at the PHY layer. Therefore, the first terminal device can use the first identifier in the first SCI at the PHY layer.
  • the first message is a discovery message, thereby avoiding the large delay that may be introduced in the process of using the existing PC5-U to implement relay discovery in the prior art.
  • future relay communication application scenarios including V2X additionally require capability matching between network devices, the first terminal device, and the second terminal device.
  • the first message in the embodiment of the present application can carry the first parameter, and the first terminal device can determine whether the second terminal device meets the capability requirements of the first terminal device according to the first parameter, thereby solving the problem of the network device and the first terminal device.
  • the first terminal device may select the target second terminal device from the second terminal devices that meet the capability requirements of the first terminal device according to a preset criterion, thereby solving the problem of selecting the target second terminal device.
  • the actions of the first terminal device or the second terminal device in the above steps S501 to S505 can be executed by the processor 301 in the communication device 300 shown in FIG. 3 calling the application program code stored in the memory 303, which is implemented in this application.
  • the example does not make specific restrictions on this.
  • another communication method provided by this embodiment of the application includes the following steps:
  • the second terminal device determines a first resource for transmitting a first message, where the first resource is a resource dedicated to transmitting a discovery message, and the discovery message is used to indicate that the second terminal device is a relay terminal device.
  • the second terminal device sends a first message to the first terminal device on the first resource.
  • the first terminal device receives the first message from the second terminal device on the first resource.
  • the first message in the embodiment of the present application may be an announcement message.
  • the second terminal device may broadcast the first message in a broadcast manner, and the nearby first terminal device may receive the first message broadcast by the second terminal device.
  • the second terminal device in the embodiment of the present application broadcasts the first message
  • it may also broadcast the SCI at the same time.
  • reference may be made to the existing implementation manner, which will not be repeated here.
  • the first message in the embodiment of the present application may include the first parameter, and the related description of the first parameter may refer to the embodiment shown in FIG. 5, which will not be repeated here.
  • the announcement message in the embodiment of the present application may also carry some existing parameters.
  • the announcement message in the embodiment of the present application may also carry some existing parameters.
  • the first terminal device determines that the first message is a discovery message according to the first resource for transmitting the first message.
  • the first terminal device after receiving the first message, can learn the first resource for transmitting the first message at the PHY layer, and the first resource is a resource dedicated to transmitting the discovery message, so the first terminal device
  • the PHY layer can learn that the first message is a discovery message according to the first resource.
  • S604-S605 are the same as steps S504-S505 in the embodiment shown in FIG. 5, and related descriptions can refer to the embodiment shown in FIG. 5, which will not be repeated here.
  • the second terminal device reports the first terminal device to the first terminal device on the first resource. Send the first message.
  • the first terminal device can learn the first resource for transmitting the first message at the PHY layer. Since the first resource is a resource dedicated to transmitting the discovery message, the first terminal device can be based on the first resource at the PHY layer. A resource learns that the first message is a discovery message, thereby avoiding the large delay that may be introduced in the process of using the existing PC5-U to implement relay discovery in the prior art.
  • future relay communication application scenarios including V2X additionally require capability matching between network devices, the first terminal device, and the second terminal device.
  • the first message in the embodiment of the present application can carry the first parameter, and the first terminal device can determine whether the second terminal device meets the capability requirements of the first terminal device according to the first parameter, thereby solving the problem of the network device and the first terminal device. The problem of matching the capabilities of the device and the second terminal device.
  • the first terminal device may select the target second terminal device from the second terminal devices that meet the capability requirements of the first terminal device according to a preset criterion, thereby solving the problem of selecting the target second terminal device.
  • the actions of the first terminal device or the second terminal device in the above steps S601 to S605 can be executed by the processor 301 in the communication device 300 shown in FIG. 3 calling the application program code stored in the memory 303, which is implemented in this application.
  • the example does not make specific restrictions on this.
  • another communication method provided by this embodiment of the application includes the following steps:
  • the first terminal device sends a second message to the second terminal device.
  • the second terminal device receives the second message from the first terminal device.
  • the second message carries a second parameter, and the second parameter is used to determine whether the second terminal device meets the capability requirement of the first terminal device.
  • the capability requirement For the related description of the capability requirement, reference may be made to the embodiment shown in FIG. 5, which will not be repeated here.
  • the second message in the embodiment of the present application may be a request message (solicitation message), for example.
  • the first terminal device may broadcast the second message to a known nearby second terminal device by broadcasting, and the nearby second terminal device may receive the second message broadcast by the first terminal device. news.
  • the first terminal device in the embodiment of the present application broadcasts the second message
  • it may also broadcast the SCI at the same time.
  • the second parameter in the embodiment of the present application may include a list of identifiers of networks that the first terminal device is allowed to access, and the list of identifiers of networks that the first terminal device is allowed to access is used to determine whether the second terminal device satisfies The connection permission requirement of the first terminal device.
  • the second parameter in the embodiment of the present application may further include at least one of second indication information or the slicing capability requirement of the first terminal device, and the second indication information indicates that the network device that the first terminal device supports to establish a connection is Network equipment of the first type and/or network equipment of the second type.
  • the slicing capability requirement of the first terminal device is used to determine whether the second terminal device meets the slicing capability requirement of the first terminal device
  • the second indication information is used to determine whether the second terminal device meets the network that the first terminal device supports to establish a connection. The type of equipment required.
  • the request message in the embodiment of the present application may also carry some existing parameters, such as a relay service code (relay service code). service code), proximity service relay terminal identification or information of the message source terminal, etc.
  • the relay service code indicates a type of public safety service, and the proximity service relay terminal identification is assigned by the second terminal device to various relay service codes
  • the information of the message source terminal is the User Info ID assigned to the device according to the HPLMN or third-party public safety provider’s application server strategy. For details, please refer to the existing implementation, which will not be repeated here. .
  • the communication method provided in this embodiment of the present application further includes: the first terminal device sends a second SCI to the second terminal device, the second SCI includes a first identifier, and the first identifier is used for Indicates that the second message is a discovery message.
  • the first terminal device sending the second message to the second terminal device includes: the first terminal device sends to the second terminal device on the second resource The second message, where the second resource is a resource dedicated to transmitting the discovery message.
  • the second terminal device determines that the second message is a discovery message.
  • the second terminal device when the first terminal device sends the second SCI to the second terminal device, receives the second SCI from the first terminal device. Furthermore, the second terminal device determining that the second message is a discovery message includes: the second terminal device determines that the second message is a discovery message according to the first identifier in the second SCI. Since the first identifier is carried in the second SCI, after receiving the second SCI, the second terminal device can parse the second SCI at the PHY layer, so the second terminal device can use the first identifier in the second SCI at the PHY layer. It is learned that the second message is a discovery message.
  • the second terminal device determines that the second message is a discovery message, including: The terminal device determines that the second message is a discovery message according to the second resource for transmitting the second message. After the first terminal device receives the second message, it can learn the second resource for transmitting the second message at the PHY layer, and the first resource is the resource dedicated to transmitting the discovery message, so the second terminal device can be based on the PHY layer. The second resource learns that the second message is a discovery message.
  • the embodiments of the present application exemplarily provide two implementation manners for the second terminal device to recognize the second message as a discovery message at the PHY layer.
  • the second terminal device may also identify the second message as a discovery message in an existing manner, which is not specifically limited in the embodiment of the present application.
  • the second terminal device determines, according to the second parameter, whether the second terminal device meets the capability requirement of the first terminal device.
  • determining that the second terminal device meets the capability requirements of the first terminal device according to the second parameter by the second terminal device may include: the second terminal device according to the network that the first terminal device is allowed to access In the identification list of, it is determined that the network that provides services for the second terminal device is within the connection authority of the first terminal device.
  • determining that the second terminal device satisfies the capability requirement of the first terminal device by the second terminal device may also include: The slicing capability requirement determines that the slicing capability of the second terminal device meets the slicing capability requirement of the first terminal device.
  • the second terminal device determining that the second terminal device meets the capability requirement of the first terminal device may also include: when the second indication information indicates that the first terminal device only supports connection establishment When the network device of the second terminal device is a network device of the first type, the second terminal device determines that the network device accessed by the second terminal device is a network device of the first type; or, when the second indication information indicates that the first terminal device only supports connection establishment When the network device of the second terminal device is a network device of the second type, the second terminal device determines that the network device accessed by the second terminal device is a network device of the second type; or, when the second indication information indicates that the first terminal device supports the connection establishment at the same time When the network equipment of is the first type of network equipment and the second type of network equipment, the second terminal equipment determines that the network equipment accessed by the second terminal equipment is the first type of network equipment or the second type of network equipment.
  • the second terminal device determines that the second terminal device does not meet the capability requirements of the first terminal device according to the second parameter, which may include:
  • the network identification list determines that the network that provides services for the second terminal device is not within the connection authority of the first terminal device.
  • the second terminal device determines that the second terminal device does not meet the capability requirement of the first terminal device according to the second parameter, which may include: The identification list of the networks that the first terminal device is allowed to access.
  • the network that provides services for the second terminal device is determined to be within the connection authority of the first terminal device, but the second terminal device determines the first terminal device according to the slicing capability requirement of the first terminal device.
  • the slicing capability of the second terminal device does not meet the slicing capability requirement of the first terminal device.
  • the second terminal device determines that the second terminal device does not meet the capability requirement of the first terminal device according to the second parameter, which may include: The identification list of the network that the device is connected to, it is determined that the network that provides services for the second terminal device is within the connection authority of the first terminal device, but when the second indication information indicates that the first terminal device only supports the connection establishment of the network device as the first terminal device Type of network device, the second terminal device determines that the network device that the second terminal device accesses is the second type of network device; or, when the second indication information indicates that the first terminal device only supports connection establishment, the network device is the second type of network device. In the case of a type of network device, the second terminal device determines that the network device accessed by the second terminal device is a network device of the first type.
  • steps S701-S703 are described by taking the interaction between the first terminal device and a second terminal device as an example. Of course, there may be multiple second terminal devices interacting with the first terminal device. For the interaction process between any second terminal device and the first terminal device, please refer to the above steps S701-S703, which will not be repeated here.
  • the communication method provided in the embodiment of the present application further includes the following steps:
  • the second terminal device obtains the first SCI.
  • the first SCI includes a first identifier, the first identifier is used to indicate that the first message is a discovery message, and the discovery message is used to indicate that the second terminal device is a relay terminal device.
  • the second terminal device sends the first SCI and the first message to the first terminal device.
  • the first terminal device receives the first SCI and the first message from the second terminal device.
  • the first message in the embodiment of the present application may be a response message (response message).
  • the first message in the embodiment of the present application may include the first parameter, and the related description of the first parameter may refer to the embodiment shown in FIG. 5, which will not be repeated here.
  • the response message in the embodiment of the present application may also carry some existing parameters, such as a proximity service relay terminal identifier.
  • a proximity service relay terminal identifier such as a proximity service relay terminal identifier.
  • S706-S707 are the same as steps S503-S504 in the embodiment shown in FIG. 5, and related descriptions can refer to the embodiment shown in FIG. 5, which will not be repeated here.
  • the communication method provided in the embodiment of the present application may further include a relay selection process as shown in step S708:
  • step S708 is the same as step S505 in the embodiment shown in FIG. 5.
  • the second terminal device when the second terminal device sends the first message to the first terminal device , the first SCI including the first identifier may be sent to the first terminal device at the same time, and the first identifier is used to indicate that the first message is a discovery message. Since the first identifier is carried in the first SCI, after receiving the first SCI, the first terminal device can parse the first SCI at the PHY layer. Therefore, the first terminal device can use the first identifier in the first SCI at the PHY layer.
  • the first message is a discovery message, thereby avoiding the large delay that may be introduced in the process of using the existing PC5-U to implement relay discovery in the prior art.
  • future relay communication application scenarios including V2X additionally require capability matching between network devices, the first terminal device, and the second terminal device.
  • the first message in the embodiment of the present application can carry the first parameter, and the first terminal device can determine whether the second terminal device meets the capability requirements of the first terminal device according to the first parameter, thereby solving the problem of the network device and the first terminal device.
  • the first terminal device may select the target second terminal device from the second terminal devices that meet the capability requirements of the first terminal device according to a preset criterion, thereby solving the problem of selecting the target second terminal device.
  • the actions of the first terminal device or the second terminal device in the above steps S701 to S708 can be executed by the processor 301 in the communication device 300 shown in FIG. 3 calling the application program code stored in the memory 303, and the implementation of this application The example does not make specific restrictions on this.
  • another communication method provided by an embodiment of this application includes the following steps:
  • S801-S803 are the same as steps S701-S703 in the embodiment shown in FIG. 7.
  • steps S701-S703 in the embodiment shown in FIG. 7.
  • the second terminal device determines a first resource for transmitting the first message, where the first resource is a resource dedicated to transmitting a discovery message, and the discovery message is used to indicate that the second terminal device is a relay terminal device.
  • the second terminal device sends a first message to the first terminal device on the first resource.
  • the first terminal device receives the first message from the second terminal device on the first resource.
  • the first message in the embodiment of the present application may be a response message (response message).
  • the first message in the embodiment of the present application may include the first parameter, and the related description of the first parameter may refer to the embodiment shown in FIG. 5, which will not be repeated here.
  • the response message in the embodiment of the present application may also carry some existing parameters, such as a proximity service relay terminal identifier.
  • a proximity service relay terminal identifier such as a proximity service relay terminal identifier.
  • the second terminal device in the embodiment of the present application when the second terminal device in the embodiment of the present application sends the first message to the first terminal device, it may also send the SCI at the same time.
  • the second terminal device in the embodiment of the present application when it sends the first message to the first terminal device, it may also send the SCI at the same time.
  • the SCI for details, please refer to the existing implementation manner, which will not be repeated here.
  • S806-S807 are the same as steps S603-S604 in the embodiment shown in FIG. 6, and related descriptions can refer to the embodiment shown in FIG. 6, which will not be repeated here.
  • the communication method provided in the embodiment of the present application may further include a relay selection process as shown in step S808:
  • step S808 is the same as step S505 in the embodiment shown in FIG. 5. For related descriptions, reference may be made to the embodiment shown in FIG. 5, which will not be repeated here.
  • the second terminal device reports the first terminal device to the first terminal device on the first resource. Send the first message.
  • the first terminal device can learn the first resource for transmitting the first message at the PHY layer. Since the first resource is a resource dedicated to transmitting the discovery message, the first terminal device can be based on the first resource at the PHY layer. A resource learns that the first message is a discovery message, thereby avoiding the large delay that may be introduced in the process of using the existing PC5-U to implement relay discovery in the prior art.
  • future relay communication application scenarios including V2X additionally require capability matching between network devices, the first terminal device, and the second terminal device.
  • the first message in the embodiment of the present application can carry the first parameter, and the first terminal device can determine whether the second terminal device meets the capability requirements of the first terminal device according to the first parameter, thereby solving the problem of the network device and the first terminal device. The problem of matching the capabilities of the device and the second terminal device.
  • the first terminal device may select the target second terminal device from the second terminal devices that meet the capability requirements of the first terminal device according to a preset criterion, thereby solving the problem of selecting the target second terminal device.
  • the actions of the first terminal device or the second terminal device in the above steps S801 to S808 can be executed by the processor 301 in the communication device 300 shown in FIG. 3 calling the application program code stored in the memory 303, which is implemented in this application
  • the example does not make specific restrictions on this.
  • the problem of matching the capabilities of the network device, the first terminal device, and the second terminal device in the NR relay communication scenario is solved;
  • NR relay In the communication scenario the problem of the selection of the target second terminal device; and the problem of large delay that may be introduced in the process of using the existing PC5-U to realize the relay discovery in the prior art.
  • the solutions provided by the embodiments of the present application can be decoupled from each other.
  • the technical solutions provided by the embodiments of the present application can be used to solve any one of the above three problems, and other technical solutions other than the embodiments of the present application can be used to solve the other two of the above three problems.
  • the technical solutions provided in the embodiments of this application can be used to solve two of the above three problems, and other technical solutions other than the embodiments of this application can be used to solve another of the above three problems. There is no specific restriction on this.
  • the embodiment of the present application in addition to the discovery message identification method provided in the embodiments shown in FIG. 5 to FIG. 8, the embodiment of the present application also provides a discovery message identification method, which specifically includes: The message (discovery message) is assigned a default destination ID (Destination ID), and the default Destination ID is used to indicate that the corresponding message (such as the aforementioned first message or second message) is a discovery message.
  • the message (discovery message) is assigned a default destination ID (Destination ID), and the default Destination ID is used to indicate that the corresponding message (such as the aforementioned first message or second message) is a discovery message.
  • the MAC layer can identify the first message as a discovery message according to the Destination ID; or, when the second terminal device receives the second message After the message, the MAC layer can identify the second message as a discovery message according to the Destination ID, which is not specifically limited in the embodiment of the present application.
  • the embodiment of the present application in addition to the discovery message identification method provided in the embodiments shown in FIG. 5 to FIG. 8, the embodiment of the present application also provides a discovery message identification method, which specifically includes:
  • the message provides a dedicated logical channel, which is used to indicate that the corresponding message (such as the above-mentioned first message or second message) is a discovery message. Since the logical channel is parsed at the MAC layer, after the first terminal device receives the first message, the MAC layer can identify the first message as a discovery message according to the dedicated logical channel; or, when the second terminal device receives After the second message, the MAC layer can identify the second message as a discovery message according to the dedicated logical channel, which is not specifically limited in the embodiment of the present application.
  • the methods and/or steps implemented by the first terminal device can also be implemented by components (such as chips or circuits) that can be used for the first terminal device; those implemented by the second terminal device
  • the methods and/or steps may also be implemented by components (for example, chips or circuits) that can be used in the second terminal device.
  • an embodiment of the present application also provides a communication device, which is used to implement the foregoing various methods.
  • the communication device may be the first terminal device in the foregoing method embodiment, or a device including the foregoing first terminal device, or a component that can be used in the first terminal device; or, the communication device may be the foregoing method embodiment.
  • the second terminal device or a device that includes the above-mentioned second terminal device, or is a component that can be used for the second terminal device. It can be understood that, in order to realize the above-mentioned functions, the communication device includes hardware structures and/or corresponding hardware structures that perform each function.
  • the embodiments of the present application may divide the communication device into functional modules according to the foregoing method embodiments.
  • each functional module may be divided corresponding to each function, or two or more functions may be integrated into one processing module.
  • the above-mentioned integrated modules can be implemented in the form of hardware or software functional modules. It should be noted that the division of modules in the embodiments of the present application is illustrative, and is only a logical function division, and there may be other division methods in actual implementation.
  • FIG. 9 shows a schematic structural diagram of a communication device 90.
  • the communication device 90 includes a transceiver module 901 and a processing module 902.
  • the transceiver module 901 may also be referred to as a transceiver unit to implement a transceiver function, for example, it may be a transceiver circuit, a transceiver, a transceiver or a communication interface.
  • the transceiver module 901 is configured to receive a first SCI and a first message from a second terminal device, the first SCI includes a first identifier, the first identifier is used to indicate that the first message is a discovery message, and the discovery message is used to indicate the second terminal
  • the device is a relay terminal device.
  • the processing module 902 is configured to determine that the first message is a discovery message according to the first identifier.
  • the transceiver module 901 is configured to receive the first message from the second terminal device; the processing module 902 is configured to determine that the first message is a discovery message according to the first resource for transmitting the first message, where the first resource is dedicated to transmission discovery The resource of the message, the discovery message is used to indicate that the second terminal device is a relay terminal device.
  • the first message includes a first parameter; the processing module 902 is further configured to determine, according to the first parameter, that the second terminal device meets the capability requirement of the first terminal device or the second terminal device does not meet the capability of the first terminal device demand.
  • the first parameter includes an identifier of a network that provides services for the second terminal device; correspondingly, the processing module 902 is configured to determine that the second terminal device meets the capability requirement of the first terminal device according to the first parameter, including: The processing module 902 is configured to determine, according to the identity of the network that provides services for the second terminal device, that the network that provides services for the second terminal device is within the connection authority of the first terminal device.
  • the first parameter further includes network slicing capability information of the second terminal device; the processing module 902, configured to determine that the second terminal device meets the capability requirements of the first terminal device, further includes: a processing module 902, further configured to 2.
  • the slicing capability information of the terminal device determines that the slicing capability of the second terminal device meets the slicing capability requirement of the first terminal device.
  • the first parameter further includes first indication information.
  • the first indication information indicates that the network device accessed by the second terminal device is a first type of network device or a second type of network device;
  • the processing module 902 is configured to determine The second terminal device that satisfies the capability requirements of the first terminal device further includes: a processing module 902, configured to determine the second type of network device according to the first indication information when the network device that the first terminal device only supports connection establishment is the first type of network device Whether the network device accessed by the terminal device is a network device of the first type; or, the processing module 902 is configured to: when the network device that the first terminal device only supports connection establishment is a network device of the second type, according to the first instruction information It is determined that the network device accessed by the second terminal device is a network device of the second type; or, the processing module 902 is configured to: when the network device that the first terminal device simultaneously supports to establish a connection is a network device of the first type and a network device of the second type In the case of a network
  • the transceiver module 901 is further configured to send a second message to the second terminal device, the second message carries a second parameter, and the second parameter is used to determine that the second terminal device meets the capability requirement of the first terminal device.
  • the transceiver module 901 is configured to send a second message to the second terminal device, including: the transceiver module 901 is configured to send the second message to the second terminal device on the second resource, the second resource being dedicated to transmission Discover the source of the message.
  • the transceiver module 901 is further configured to send a second SCI to the second terminal device.
  • the second SCI includes a first identifier, and the first identifier is used to indicate that the second message is a discovery message.
  • the processing module 902 is further configured to select a target second terminal device from a plurality of second terminal devices that meet the capability requirements of the first terminal device according to a preset criterion.
  • the transceiver module 901 is configured to receive a first message from a second terminal device, the first message includes a first parameter; the processing module 902 is configured to determine that the second terminal device meets the capabilities of the first terminal device according to the first parameter Demand or the second terminal device does not meet the capability demand of the first terminal device.
  • the processing module 902 is configured to obtain a first SCI, the first SCI includes a first identifier, the first identifier is used to indicate that the first message is a discovery message, and the discovery message is used to indicate that the second terminal device is a relay terminal device; the transceiver module 901 , Used to send the first SCI and the first message to the first terminal device.
  • the processing module 902 is used to determine the first resource, the first resource is a resource dedicated to transmitting discovery messages, and the discovery message is used to indicate that the second terminal device is a relay terminal device; the transceiving module 901 is used to send information to the first resource The first terminal device sends the first message.
  • the transceiver module 901 is further configured to receive a second message from the first terminal device, and the second message carries a second parameter; the processing module 902 is further configured to determine that the second message is a discovery message; the processing module 902 is also configured to It is used to determine that the second terminal device meets the capability requirement of the first terminal device according to the second parameter.
  • the transceiver module 901 is configured to receive a second SCI from the first terminal device, the second SCI includes a first identifier, and the first identifier is used to indicate that the second message is a discovery message; the processing module 902 is also configured to The first identifier determines that the second message is a discovery message.
  • the processing module 902 is further configured to determine that the second message is a discovery message according to a second resource for transmitting the second message, and the second resource is a resource dedicated to transmitting the discovery message.
  • the second parameter includes a list of identifications of the networks that the first terminal device is allowed to access; correspondingly, the processing module 902 is configured to determine that the second terminal device meets the capability requirements of the first terminal device according to the second parameter, including : The processing module 902 is configured to determine, according to the identification list of the networks that the first terminal device is allowed to access, that the network that provides services for the second terminal device is within the connection authority of the first terminal device.
  • the second parameter further includes the slicing capability requirement of the first terminal device;
  • the processing module 902 is configured to determine that the second terminal device meets the capability requirement of the first terminal device and further includes: a processing module 902, configured to The slicing capability requirement of the second terminal device is determined to meet the slicing capability requirement of the first terminal device.
  • the second parameter further includes second indication information
  • the second indication information indicates that the network device that the first terminal device supports to establish a connection is a first type of network device and/or a second type of network device
  • the processing module 902 The method for determining that the second terminal device satisfies the capability requirements of the first terminal device further includes: a processing module 902, configured to: when the second indication information indicates that the first terminal device only supports connection establishment, the network device is a network device of the first type, It is determined that the network device accessed by the second terminal device is a network device of the first type; or, the processing module 902 is configured to: when the second indication information indicates that the first terminal device only supports connection establishment, the network device is a network device of the second type When determining that the network device that the second terminal device accesses is the second type of network device; or, the processing module 902 is configured to: when the second indication information indicates that the first terminal device also supports connection establishment, the network device is of the first type When the network device is the network device of the second type,
  • the processing module 902 is used to determine the first parameter; the transceiver module 901 is used to send a first message to the first terminal device, the first message includes the first parameter, and the first parameter is used to determine that the second terminal device satisfies the first parameter.
  • the capability requirement of a terminal device or the second terminal device does not meet the capability requirement of the first terminal device.
  • the communication device 90 is presented in the form of dividing various functional modules in an integrated manner.
  • the "module” here can refer to a specific ASIC, circuit, processor and memory that executes one or more software or firmware programs, integrated logic circuit, and/or other devices that can provide the above-mentioned functions.
  • the communication device 90 may take the form of the communication device 300 shown in FIG. 3.
  • the processor 301 in the communication device 300 shown in FIG. 3 may invoke the computer execution instructions stored in the memory 303 to enable the communication device 300 to execute the communication method in the foregoing method embodiment.
  • the functions/implementation process of the transceiver module 901 and the processing module 902 in FIG. 9 may be implemented by the processor 301 in the communication device 300 shown in FIG. 3 calling a computer execution instruction stored in the memory 303.
  • the function/implementation process of the processing module 902 in FIG. 9 can be implemented by the processor 301 in the communication device 300 shown in FIG. /The realization process can be realized through the communication interface 304 in the communication device 300 shown in FIG. 3.
  • the communication device 90 provided in this embodiment can execute the communication method in the foregoing method embodiment, the technical effects that can be obtained can refer to the foregoing method embodiment, which will not be repeated here.
  • FIG. 10 shows a schematic structural diagram of a communication device 100.
  • the communication device 100 includes a processing module 1001.
  • the processing module 1001 is used to determine multiple second terminal devices that meet the capability requirements of the first terminal device; and select the target first terminal device from the multiple second terminal devices that meet the capability requirements of the first terminal device according to a preset criterion. Two terminal equipment.
  • the communication device 100 is presented in the form of dividing various functional modules in an integrated manner.
  • the "module” here can refer to a specific ASIC, circuit, processor and memory that executes one or more software or firmware programs, integrated logic circuit, and/or other devices that can provide the above-mentioned functions.
  • the communication device 100 may adopt the form of the communication device 300 shown in FIG. 3.
  • the processor 301 in the communication device 300 shown in FIG. 3 may invoke the computer execution instructions stored in the memory 303 to enable the communication device 300 to execute the communication method in the foregoing method embodiment.
  • the function/implementation process of the processing module 1001 in FIG. 10 may be implemented by the processor 301 in the communication device 300 shown in FIG. 3 calling a computer execution instruction stored in the memory 303.
  • the communication device 100 provided in this embodiment can execute the communication method in the foregoing method embodiment, the technical effects that can be obtained can refer to the foregoing method embodiment, and details are not described herein again.
  • one or more of the above modules or units can be implemented by software, hardware or a combination of both.
  • the software exists in the form of computer program instructions and is stored in the memory, and the processor can be used to execute the program instructions and implement the above method flow.
  • the processor can be built in SoC (system on chip) or ASIC, or it can be an independent semiconductor chip.
  • SoC system on chip
  • ASIC application specific integrated circuit
  • the processor's internal processing is used to execute software instructions to perform calculations or processing, and may further include necessary hardware accelerators, such as field programmable gate array (FPGA), PLD (programmable logic device) , Or a logic circuit that implements dedicated logic operations.
  • FPGA field programmable gate array
  • PLD programmable logic device
  • the hardware can be a CPU, a microprocessor, a digital signal processing (digital signal processing, DSP) chip, a microcontroller unit (MCU), an artificial intelligence processor, an ASIC, Any one or any combination of SoC, FPGA, PLD, dedicated digital circuit, hardware accelerator, or non-integrated discrete device can run necessary software or do not rely on software to perform the above method flow.
  • DSP digital signal processing
  • MCU microcontroller unit
  • an artificial intelligence processor an ASIC
  • Any one or any combination of SoC, FPGA, PLD, dedicated digital circuit, hardware accelerator, or non-integrated discrete device can run necessary software or do not rely on software to perform the above method flow.
  • an embodiment of the present application further provides a communication device (for example, the communication device may be a chip or a chip system), and the communication device includes a processor for implementing the method in any of the foregoing method embodiments.
  • the communication device further includes a memory.
  • the memory is used to store necessary program instructions and data, and the processor can call the program code stored in the memory to instruct the communication device to execute the method in any of the foregoing method embodiments.
  • the memory may not be in the communication device.
  • the communication device is a chip system, it may be composed of a chip, or may include a chip and other discrete devices, which is not specifically limited in the embodiment of the present application.
  • the above embodiments it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof.
  • a software program it can be implemented in the form of a computer program product in whole or in part.
  • the computer program product includes one or more computer instructions.
  • the computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices.
  • the computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium.
  • the computer instructions may be transmitted from a website, computer, server, or data center.
  • the computer-readable storage medium may be any available medium that can be accessed by a computer or includes one or more data storage devices such as servers, data centers, etc. that can be integrated with the medium.
  • the usable medium may be a magnetic medium (for example, a floppy disk, a hard disk, and a magnetic tape), an optical medium (for example, a DVD), or a semiconductor medium (for example, a solid state disk (SSD)).

Abstract

本申请实施例提供通信方法、设备及系统，用于解决现有技术中在使用已有的PC5-U实现中继发现的过程中，由于SD-RSRP测量而引入较大时延的问题。方法包括：第一终端设备接收来自第二终端设备的第一侧行链路控制信息SCI和第一消息，该第一SCI包括第一标识，该第一标识用于指示该第一消息为发现消息，该发现消息用于指示该第二终端设备为中继终端设备。第一终端设备根据该第一标识确定该第一消息为发现消息。

Description

通信方法、设备及系统 技术领域
本申请涉及通信技术领域，尤其涉及通信方法、设备及系统。
背景技术
为了实现远端(remote)用户设备(user equipment，UE)与基站之间的通信，有必要建立remote UE与中继(relay)UE之间的侧行链路(side link，SL)通信。在实现SL通信之前，首先需要实现remote UE与relay UE之间的中继发现(relay discovery)。如图1所示，第三代合作伙伴计划(3rd generation partnership project，3GPP)版本15(release15，R15)中专门为中继发现在PC-5接口上设计了相应的协议栈，因此remote UE与relay UE之间有两组分别用于中继发现和SL通信的协议栈。其中，PC5-D用于中继发现，包括物理(physical，PHY)层、媒体接入控制(media access control，MAC)和临近业务协议(prose protocol)层；PC5-U用于SL通信，包括PHY层、MAC层、无线链路控制(radio link control，RLC)层、分组数据汇聚层协议(packet data convergence protocol，PDCP)层、互联网协议(internet protocol，IP)层和应用(application)层。
然而，按照3GPP技术规范(tchnology standard，TS)23.287的定义，车联网(vehicle to everything，V2X)中将没有专门的PC5-D用于中继发现。为了后向兼容，R17中也不会设计专门的PC5-D中用于中继发现。在此前提下，该如何使用已有的PC5-U实现中继发现过程需要进一步讨论。
目前，有方案提出，在使用已有的PC5-U实现中继发现时，可以通过在L2帧(即MAC层的数据帧)中添加标识的方式来指示相关的发现消息(discovery message)。然而，一般地，在中继发现完成后紧接着会进行中继选择(relay(re)selection)过程，而这个过程中需要用到PHY层测量得到的侧行链路发现参考信号接收功率(sidelink discovery reference signal receiving power,SD-RSRP)等通信质量信息。若采用上述方案，remote UE在完成PHY层消息处理后，在MAC层才知道这是一条发现消息，因此又需要下发SL测量配置去测量SD-RSRP以用于中继选择，从而往往会引入较大的时延。
因此，在使用已有的PC5-U实现中继发现的过程中，如何避免由于SD-RSRP测量而引入较大时延，是目前亟待解决的问题。
发明内容
本申请实施例提供通信方法、设备及系统，用于解决现有技术中在使用已有的PC5-U实现中继发现的过程中，由于SD-RSRP测量而引入较大时延的问题。
为达到上述目的，本申请的实施例采用如下技术方案：
第一方面，提供了一种通信方法，该方法包括：第一终端设备接收来自第二终端设备的第一侧行链路控制信息SCI和第一消息，该第一SCI包括第一标识，该第一标识用于指示该第一消息为发现消息，该发现消息用于指示该第二终端设备为中继终端 设备。第一终端设备根据该第一标识确定该第一消息为发现消息。现有技术中在使用已有的PC5-U实现中继发现的过程中可能引入的较大时延，本申请实施例中，第二终端设备向第一终端设备发送第一消息时，可以同时向第一终端设备发送包括第一标识的第一SCI，第一标识用于指示第一消息为发现消息。由于第一标识携带在第一SCI中，第一终端设备接收到第一SCI之后，可以在PHY层解析第一SCI，因此第一终端设备在PHY层即可根据第一SCI中的第一标识获知第一消息为发现消息，从而避免了现有技术中在使用已有的PC5-U实现中继发现的过程中可能引入的较大时延。
第二方面，提供了一种通信方法，该方法包括：第一终端设备接收来自第二终端设备的第一消息；第一终端设备根据传输该第一消息的第一资源确定该第一消息为发现消息，其中，该第一资源为专用于传输发现消息的资源，该发现消息用于指示该第二终端设备为中继终端设备。现有技术中在使用已有的PC5-U实现中继发现的过程中可能引入的较大时延，本申请实施例中，第二终端设备在第一资源上向第一终端设备发送第一消息。第一终端设备接收到第一消息之后，可以在PHY层获知传输第一消息的第一资源，由于第一资源为专用于传输发现消息的资源，因此第一终端设备在PHY层即可根据第一资源获知第一消息为发现消息，从而避免了现有技术中在使用已有的PC5-U实现中继发现的过程中可能引入的较大时延。
结合上述第一方面或第二方面，在一种可能的实现方式中，该第一消息包括第一参数；本申请实施例提供的通信方法还包括：第一终端设备根据该第一参数，确定该第二终端设备满足该第一终端设备的能力需求或者该第二终端设备不满足该第一终端设备的能力需求。相比于目前的公共安全应用场景，包括V2X在内未来中继通信应用场景额外要求网络设备、第一终端设备和第二终端设备之间进行能力匹配。然而，目前在NR中继通信场景中，没有方案解决网络设备、第一终端设备和第二终端设备的能力匹配问题。本申请实施例中的第一消息中可以携带第一参数，第一终端设备根据第一参数，可以确定第二终端设备是否满足第一终端设备的能力需求，从而解决了网络设备、第一终端设备和第二终端设备的能力匹配问题。
结合上述第一方面或第二方面，在一种可能的实现方式中，该第一参数包括为该第二终端设备提供服务的网络的标识；相应的，第一终端设备根据该第一参数，确定该第二终端设备满足该第一终端设备的能力需求，包括：第一终端设备根据为该第二终端设备提供服务的网络的标识，确定为该第二终端设备提供服务的网络在该第一终端设备的连接权限内。即，本申请实施例中，第一终端设备的能力需求可以包括连接权限需求。
结合上述第一方面或第二方面，在一种可能的实现方式中，该第一参数还包括该第二终端设备的网络切片能力信息；确定该第二终端设备满足该第一终端设备的能力需求还包括：第一终端设备根据该第二终端设备的切片能力信息，确定该第二终端设备的切片能力满足该第一终端设备的切片能力需求。即，本申请实施例中，第一终端设备的能力需求还可以包括切片能力需求。
结合上述第一方面或第二方面，在一种可能的实现方式中，该第一参数还包括第一指示信息，该第一指示信息指示该第二终端设备接入的网络设备为第一类型的网络设备或第二类型的网络设备；确定该第二终端设备满足该第一终端设备的能力需求还 包括：当第一终端设备仅支持建连接的网络设备为该第一类型的网络设备时，该第一终端设备根据该第一指示信息确定该第二终端设备接入的网络设备是否为该第一类型的网络设备；或者，当第一终端设备仅支持建连接的网络设备为该第二类型的网络设备时，该第一终端设备根据该第一指示信息确定该第二终端设备接入的网络设备为该第二类型的网络设备；或者，当第一终端设备同时支持建连接的网络设备为该第一类型的网络设备和该第二类型的网络设备时，该第一终端设备根据该第一指示信息确定该第二终端设备接入的网络设备为该第一类型的网络设备或该第二类型的网络设备。即，本申请实施例中，第一终端设备的能力需求还可以包括支持建连接的网络设备的类型需求。
结合上述第一方面或第二方面，在一种可能的实现方式中，当该第一指示信息指示该第二终端设备接入的网络设备为该第一类型的网络设备时，该第一参数还包括该第二终端设备接入的网络设备所连接的核心网类型。其中，第二终端设备接入的网络设备所连接的核心网类型可用于后续的中继选择。
第三方面，提供了一种通信方法，该方法包括：第一终端设备接收来自第二终端设备的第一消息，该第一消息中包括第一参数；第一终端设备根据该第一参数，确定该第二终端设备满足该第一终端设备的能力需求或者该第二终端设备不满足该第一终端设备的能力需求。相比于目前的公共安全应用场景，包括V2X在内未来中继通信应用场景额外要求网络设备、第一终端设备和第二终端设备之间进行能力匹配。然而，目前在NR中继通信场景中，没有方案解决网络设备、第一终端设备和第二终端设备的能力匹配问题。本申请实施例中的第一消息中可以携带第一参数，第一终端设备根据第一参数，可以确定第二终端设备是否满足第一终端设备的能力需求，从而解决了网络设备、第一终端设备和第二终端设备的能力匹配问题。
可选的，第一参数的相关描述以及该第一终端设备根据该第一参数，确定该第二终端设备满足该第一终端设备的能力需求的方式可参考上述第一方面或第二方面，在此不再赘述。
结合上述第一方面或第二方面或第三方面，在一种可能的实现方式中，本申请实施例提供的通信方法还包括：第一终端设备向第二终端设备发送第二消息，该第二消息携带第二参数，该第二参数用于确定该第二终端设备满足该第一终端设备的能力需求。相比于目前的公共安全应用场景，包括V2X在内未来中继通信应用场景额外要求网络设备、第一终端设备和第二终端设备之间进行能力匹配。然而，目前在NR中继通信场景中，没有方案解决网络设备、第一终端设备和第二终端设备的能力匹配问题。本申请实施例中的第二消息中可以携带第二参数，该第二参数用于确定该第二终端设备满足该第一终端设备的能力需求，从而解决了网络设备、第一终端设备和第二终端设备的能力匹配问题。
结合上述第一方面或第二方面或第三方面，在一种可能的实现方式中，该第二参数包括允许该第一终端设备接入的网络的标识列表。即，本申请实施例中，第一终端设备的能力需求可以包括连接权限需求。
结合上述第一方面或第二方面或第三方面，在一种可能的实现方式中，该第二参数还包括第二指示信息或者该第一终端设备的切片能力需求中的至少一个，该第二指 示信息指示该第一终端设备支持建连接的网络设备为第一类型的网络设备和/或第二类型的网络设备。即，本申请实施例中，第一终端设备的能力需求还可以包括切片能力需求或者支持建连接的网络设备的类型需求中的至少一个。
结合上述第一方面或第二方面或第三方面，在一种可能的实现方式中，第一终端设备向第二终端设备发送第二消息，包括：第一终端设备在第二资源上向该第二终端设备发送该第二消息，该第二资源为专用于传输发现消息的资源。由于第一终端设备接收到第二消息之后，可以在PHY层获知传输第二消息的第二资源，而第一资源为专用于传输发现消息的资源，因此第二终端设备在PHY层即可根据第二资源获知第二消息为发现消息。
结合上述第一方面或第二方面或第三方面，在一种可能的实现方式中，本申请实施例提供的通信方法还包括：第一终端设备向第二终端设备发送第二SCI，该第二SCI包括第一标识，该第一标识用于指示该第二消息为发现消息。由于第一标识携带在第二SCI中，第二终端设备接收到第二SCI之后，可以在PHY层解析第二SCI，因此第二终端设备在PHY层即可根据第二SCI中的第一标识获知第二消息为发现消息。
结合上述第一方面或第二方面或第三方面，在一种可能的实现方式中，本申请实施例提供的通信方法还包括：第一终端设备根据预设准则从满足该第一终端设备的能力需求的多个第二终端设备中选择目标第二终端设备。目前在NR中继通信场景中，没有方案解决当满足第一终端设备的能力需求的第二终端设备有多个时，如何选择最合适的目标第二终端设备的问题。本申请实施例中，第一终端设备可以根据预设准则从满足第一终端设备的能力需求的第二终端设备中选择目标第二终端设备，从而解决了目标第二终端设备的选择问题。
结合上述第一方面或第二方面或第三方面，在一种可能的实现方式中，该预设准则包括第一预设准则，该第一预设准则用于确定优先级较高的一个或多个第二终端设备。可选的，优先级较高的一个或多个第二终端设备可以为上述的目标第二终端设备。
结合上述第一方面或第二方面或第三方面，在一种可能的实现方式中，该第一预设准则包括以下一项或多项：接入第一网络设备的第二终端设备的优先级较高，该第一网络设备为该第一终端设备接入的网络设备；接入的网络设备所连接的核心网类型为目标核心网类型的第二终端设备的优先级较高；资源池信道繁忙程度不大于第一阈值的第二终端设备的优先级较高；功率测量值不小于第二阈值的第二终端设备的优先级较高；或者，当该第一终端设备同时支持建连接的网络设备为第一类型的网络设备或第二类型的网络设备时，接入目标类型的网络设备的第二终端设备的优先级较高，该目标类型为该第一终端设备默认的网络设备类型；或者，该目标类型为该第一终端设备的高优先级业务对应的网络设备类型。
结合上述第一方面或第二方面或第三方面，在一种可能的实现方式中，该预设准则还包括第二预设准则，该第二预设准则用于从优先级较高的一个或多个第二终端设备中选择该目标第二终端设备。
结合上述第一方面或第二方面或第三方面，在一种可能的实现方式中，该第二预设准则包括：目标第二终端设备为该优先级较高的一个或多个第二终端设备中对应的资源池信道繁忙程度最小的第二终端设备；或者，目标第二终端设备为该优先级较高 的一个或多个第二终端设备中对应的功率测量值最大的第二终端设备。
结合上述第一方面或第二方面或第三方面，在一种可能的实现方式中，该预设准则包括：目标第二终端设备为满足该第一终端设备的能力需求的多个第二终端设备中对应的资源池信道繁忙程度最小的第二终端设备；或者，目标第二终端设备为满足该第一终端设备的能力需求的多个第二终端设备中对应的功率测量值最大的第二终端设备。
结合上述第一方面或第二方面或第三方面，在一种可能的实现方式中，该第一类型为长期演进LTE，该第二类型为新空口NR。
相应的，该第一类型的网络设备为LTE系统演进型节点eNB，该第二类型的网络设备为NR系统演进型节点gNB。
第四方面，提供了一种通信方法，该方法包括：第二终端设备获取第一侧行链路控制信息SCI，该第一SCI包括第一标识，该第一标识用于指示第一消息为发现消息，该发现消息用于指示该第二终端设备为中继终端设备；第二终端设备向第一终端设备发送该第一SCI和该第一消息。其中，第四方面的技术效果可参考上述第一方面，在此不再赘述。
第五方面，提供了一种通信方法，该方法包括：第二终端设备确定第一资源，该第一资源为专用于传输发现消息的资源，该发现消息用于指示该第二终端设备为中继终端设备；第二终端设备在该第一资源上向该第一终端设备发送第一消息。其中，第五方面的技术效果可参考上述第二方面，在此不再赘述。
结合上述第四方面或第五方面，在一种可能的实现方式中，该第一消息中包括第一参数，该第一参数用于确定该第二终端设备满足该第一终端设备的能力需求或者该第二终端设备不满足该第一终端设备的能力需求。
结合上述第四方面或第五方面，在一种可能的实现方式中，该第一参数包括为该第二终端设备提供服务的网络的标识。
结合上述第四方面或第五方面，在一种可能的实现方式中，该第一参数还包括第一指示信息或者该第二终端设备的网络切片能力信息中的至少一个，该第一指示信息指示该第二终端设备接入的网络设备为第一类型的网络设备或第二类型的网络设备。
结合上述第四方面或第五方面，在一种可能的实现方式中，当该第一指示信息指示该第二终端设备接入的网络设备为该第一类型的网络设备时，该第一参数还包括该第二终端设备接入的网络设备所连接的核心网类型。
第六方面，提供了一种通信方法，该方法包括：第二终端设备确定第一参数；第二终端设备向第一终端设备发送第一消息，该第一消息中包括第一参数，该第一参数用于确定该第二终端设备满足该第一终端设备的能力需求或者该第二终端设备不满足该第一终端设备的能力需求。其中，第六方面的技术效果可参考上述第三方面，在此不再赘述。
可选的，第一参数的相关描述以及该第一终端设备根据该第一参数，确定该第二终端设备满足该第一终端设备的能力需求的方式可参考上述第一方面，在此不再赘述。
结合上述第四方面或第五方面或第六方面，在一种可能的实现方式中，本申请实施例提供的通信方法还包括：第二终端设备接收来自该第一终端设备的第二消息，该 第二消息携带第二参数；第二终端设备确定该第二消息为发现消息；第二终端设备根据该第二参数，确定该第二终端设备满足该第一终端设备的能力需求。
结合上述第四方面或第五方面或第六方面，在一种可能的实现方式中，本申请实施例提供的通信方法还包括：第二终端设备接收来自该第一终端设备的第二SCI，该第二SCI包括第一标识，该第一标识用于指示该第二消息为发现消息；第二终端设备根据该第一标识，确定该第二消息为发现消息。
结合上述第四方面或第五方面或第六方面，在一种可能的实现方式中，该方法还包括：第二终端设备根据传输该第二消息的第二资源确定该第二消息为发现消息，该第二资源为专用于传输发现消息的资源。
结合上述第四方面或第五方面或第六方面，在一种可能的实现方式中，该第二参数包括允许该第一终端设备接入的网络的标识列表；相应的，第二终端设备根据该第二参数，确定该第二终端设备满足该第一终端设备的能力需求，包括：第二终端设备根据该允许该第一终端设备接入的网络的标识列表，确定为该第二终端设备提供服务的网络在该第一终端设备的连接权限内。
结合上述第四方面或第五方面或第六方面，在一种可能的实现方式中，该第二参数还包括该第一终端设备的切片能力需求；第二终端设备确定该第二终端设备满足该第一终端设备的能力需求还包括：第二终端设备根据该第一终端设备的切片能力需求，确定该第二终端设备的切片能力满足该第一终端设备的切片能力需求。
结合上述第四方面或第五方面或第六方面，在一种可能的实现方式中，该第二参数还包括第二指示信息，该第二指示信息指示该第一终端设备支持建连接的网络设备为第一类型的网络设备和/或第二类型的网络设备；第二终端设备确定该第二终端设备满足该第一终端设备的能力需求还包括：当该第二指示信息指示该第一终端设备仅支持建连接的网络设备为第一类型的网络设备时，该第二终端设备确定该第二终端设备接入的网络设备为该第一类型的网络设备；或者，当该第二指示信息指示该第一终端设备仅支持建连接的网络设备为第二类型的网络设备时，该第二终端设备确定该第二终端设备接入的网络设备为该第二类型的网络设备；或者，当该第二指示信息指示该第一终端设备同时支持建连接的网络设备为该第一类型的网络设备和该第二类型的网络设备时，该第二终端设备确定该第二终端设备接入的网络设备为该第一类型的网络设备或者该第二类型的网络设备。
第七方面，提供了一种中继选择方法，其特征在于，该方法包括：第一终端设备确定满足该第一终端设备的能力需求的多个第二终端设备；第一终端设备根据预设准则从满足该第一终端设备的能力需求的多个第二终端设备中选择目标第二终端设备。目前在NR中继通信场景中，没有方案解决当满足第一终端设备的能力需求的第二终端设备有多个时，如何选择最合适的目标第二终端设备的问题。本申请实施例中，第一终端设备可以根据预设准则从满足第一终端设备的能力需求的第二终端设备中选择目标第二终端设备，从而解决了目标第二终端设备的选择问题。
其中，预设准则的相关描述可参考上述第一方面，在此不再赘述。
第八方面，提供了一种通信装置用于实现上述各种方法。所述通信装置包括实现上述方法相应的模块、单元、或手段(means)，该模块、单元、或means可以通过硬 件实现，软件实现，或者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或单元。
第九方面，提供了一种通信装置，包括：处理器和接口电路，接口电路用于接收来自通信装置之外的其它通信装置的信号并传输至处理器或将来自处理器的信号发送给通信装置之外的其它通信装置，处理器通过逻辑电路或执行代码指令用于实现上述任一方面的方法。
在一种可能的设计中，该通信装置还包括存储器。该存储器用于存储计算机指令，当处理器执行该指令时，以使该通信装置执行上述任一方面所述的方法。
第十方面，提供了一种通信装置，包括：处理器；所述处理器用于与存储器耦合，并读取存储器中的指令之后，根据所述指令执行如上述任一方面所述的方法。
在一种可能的设计中，该通信装置还包括存储器，该存储器，用于保存必要的程序指令和数据。该通信装置是芯片系统时，可以由芯片构成，也可以包含芯片和其他分立器件。
第十一方面，提供了一种计算机可读存储介质，该计算机可读存储介质中存储有指令，当该指令被通信装置执行时，使得该通信装置实现上述任一方面所述的方法。
第十二方面，提供了一种包含指令的计算机程序产品，当该指令被通信装置执行时，使得该通信装置实现上述任一方面所述的方法。
其中，第八方面至第十二方面中任一种设计方式所带来的技术效果可参见上述第一方面至第七方面中任一方面所带来的技术效果，此处不再赘述。
第十三方面，提供一种通信系统，该通信系统包括用于实现上述第一方面所述的方法的通信装置和用于执行上述第四方面所述的方法的通信装置；或者，该通信系统包括用于实现上述第二方面所述的方法的通信装置和用于执行上述第五方面所述的方法的通信装置；或者，该通信系统包括用于实现上述第三方面所述的方法的通信装置和用于执行上述第六方面所述的方法的通信装置。
附图说明
图1为现有的R15中用于中继发现和SL通信的协议栈示意图；
图2为本申请实施例提供的通信系统的架构示意图；
图3为本申请实施例提供的通信装置的结构示意图一；
图4为本申请实施例提供的用于SL通信的场景示意图；
图5为本申请实施例提供的通信方法的流程示意图一；
图6为本申请实施例提供的通信方法的流程示意图二；
图7为本申请实施例提供的通信方法的流程示意图三；
图8为本申请实施例提供的通信方法的流程示意图四；
图9为本申请实施例提供的通信装置的结构示意图二；
图10为本申请实施例提供的通信装置的结构示意图三。
具体实施方式
下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行描述。其中，在本申请的描述中，除非另有说明，“/”表示前后关联的对象是一种“或”的关系，例如，A/B可以表示A或B；本申请中的“和/或”仅仅是一种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这三种情况，其中A,B可以是单数或者复数。并且，在本申请的描述中，除非另有说明，“多个”是指两个或多于两个。“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。另外，为了便于清楚描述本申请实施例的技术方案，在本申请的实施例中，采用了“第一”、“第二”等字样对功能和作用基本相同的相同项或相似项进行区分。本领域技术人员可以理解“第一”、“第二”等字样并不对数量和执行次序进行限定，并且“第一”、“第二”等字样也并不限定一定不同。同时，在本申请实施例中，“示例性的”或者“例如”等词用于表示作例子、例证或说明。本申请实施例中被描述为“示例性的”或者“例如”的任何实施例或设计方案不应被解释为比其它实施例或设计方案更优选或更具优势。确切而言，使用“示例性的”或者“例如”等词旨在以具体方式呈现相关概念，便于理解。
本申请实施例的技术方案可以应用于各种通信系统。例如：长期演进(long term evolution，LTE)系统、LTE频分双工(frequency division duplex，FDD)系统、LTE时分双工(time division duplex，TDD)系统、通用移动通信系统(universal mobile telecommunication system，UMTS)、全球互联微波接入(worldwide interoperability for microwave access，WiMAX)通信系统、第五代(5th generation，5G)通信系统(也可以称之为新无线(new radio，NR)系统)或者未来的通信系统，如第六代通信系统等。其中，本申请中涉及的5G系统包括非独立组网(non-standalone，NSA)的5G系统或独立组网(standalone，SA)的5G系统，本申请实施例对此不做具体限定。此外，通信系统还可以是陆上公用移动通信网(public land mobile network，PLMN)网络、设备到设备(device-to-device，D2D)通信系统、机器到机器(machine to machine，M2M)通信系统、车辆与外界通信(vehicle to everything，V2X)通信系统、物联网(Internet of Things，IoT)通信系统或者其他通信系统。
如图2所示，为本申请实施例提供的一种通信系统20，该通信系统20包括第一终端设备、第二终端设备以及网络设备。
其中，第二终端设备在网络设备的服务范围内，并且支持为附近用户提供中继服务，因此也可以称之为中继终端设备。第一终端设备与网络设备的通信质量不佳或者不在网络设备的服务范围内，选择第二终端设备的中继功能实现通信，因此也可以称之为远端终端设备，在此统一说明，以下不再赘述。
可选的，本申请实施例中的终端设备(包括上述的第一终端设备或第二终端设备)可以只支持LTE业务、只支持NR业务、或者两者都支持。两个终端设备之间的中继业务也可以只支持LTE、只支持NR、或者两者都支持，本申请实施例对此不做具体限定。
可选的，本申请实施例中的终端设备可以是向用户提供语音和/或数据连通性的各类设备。终端设备可以经接入网，例如无线接入网(radio access network，RAN)与核心网进行通信，与RAN交换语音和/或数据。示例性的，该终端设备可以包括UE，无线终端，移动终端，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(remote terminal)，接入终端(access terminal)，用户终端(user terminal)，用户代理(user agent)，用户装备(user device)、移动电话(或称为“蜂窝”电话)，具有移动终端的计算机，便携式、袖珍式、手持式、计算机内置的或者车载的移动装置，可穿戴设备，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)，智能手环，智能手表，未来5G网络中的终端设备或者未来演进的PLMN中的终端设备或者未来车联网中的终端设备等。此外，终端设备还可以包括受限设备，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。此外，终端设备还可以是无人机设备。在本申请实施例中，应用于上述设备中的芯片也可以称为终端设备。
作为示例而非限定，在本申请实施例中，无线终端可以是手机、平板电脑、带无线收发功能的电脑、虚拟现实终端设备、增强现实终端设备、工业控制中的无线终端、无人驾驶中的无线终端、远程手术中的无线终端、智能电网中的无线终端、运输安全中的无线终端、智慧城市中的无线终端、智慧家庭中的无线终端等。
作为示例而非限定，在本申请实施例中，可穿戴设备也可以称为穿戴式智能设备，是应用穿戴式技术对日常穿戴进行智能化设计、开发出可以穿戴的设备的总称，如眼镜、手套、手表、服饰及鞋等。可穿戴设备即直接穿在身上，或是整合到用户的衣服或配件的一种便携式设备。可穿戴设备不仅仅是一种硬件设备，更是通过软件支持以及数据交互、云端交互来实现强大的功能。广义穿戴式智能设备包括功能全、尺寸大、可不依赖智能手机实现完整或者部分的功能，例如：智能手表或智能眼镜等，以及只专注于某一类应用功能，需要和其它设备如智能手机配合使用，如各类进行体征监测的智能手环、智能首饰等。
此外，在本申请实施例中，终端设备还可以是IoT系统中的终端设备，IoT是未来信息技术发展的重要组成部分，其主要技术特点是将物品通过通信技术与网络连接，从而实现人机互连，物物互连的智能化网络。在本申请实施例中，IoT技术可以通过例如窄带(narrow band，NB)技术，做到海量连接，深度覆盖，终端省电。
此外，在本申请实施例中，终端设备还可以包括智能打印机、火车探测器、加油站等传感器，主要功能包括收集数据(部分终端设备)、接收接入网设备的控制信息与下行数据，并发送电磁波，向接入网设备传输上行数据。
可选的，本申请实施例中的网络设备可以是用于与终端设备通信的任意一种具有无线收发功能的通信设备。该网络设备包括但不限于：无线网络控制器(radio network controller，RNC)，节点B(Node B，NB)，基站控制器(base station controller，BSC)，基站收发台(base transceiver station，BTS)，家庭基站(home evolved NodeB，HeNB，或home Node B，HNB)，基带单元(baseband unit，BBU)，无线保真(wireless fidelity，WIFI)系统中的接入点(access point，AP)、无线中继节点、无线回传节点、传输点(transmission point，TP)或者TRP等。该网络设备还可以为LTE系统中的演进的 NB(evolved NB，eNB)，NR系统中的下一代NB(generation NB，gNB)或TRP或TP，或者NR系统中的gNB的一个或一组(包括多个天线面板)天线面板。此外，该网络设备还可以为构成gNB或TP的网络节点，如BBU，或分布式单元(distributed unit，DU)等。
在一些部署中，gNB可以包括集中式单元(centralized unit，CU)和DU。此外，gNB还可以包括有源天线单元(active antenna unit，AAU)。CU实现gNB的部分功能，DU实现gNB的部分功能。比如，CU负责处理非实时协议和服务，实现无线资源控制(radio resource control，RRC)，PDCP层的功能。DU负责处理物理层协议和实时服务，实现RLC层、MAC层和PHY层的功能。AAU实现部分物理层处理功能、射频处理及有源天线的相关功能。由于RRC层的信息最终会变成PHY层的信息，或者，由PHY层的信息转变而来，因而，在这种架构下，高层信令，如RRC层信令，也可以认为是由DU发送的，或者，由DU+AAU发送的。可以理解的是，网络设备可以为包括CU节点、DU节点、AAU节点中一项或多项的设备。
可选的，本申请实施例中的网络设备和终端设备之间可以通过授权频谱进行通信，也可以通过免授权频谱进行通信，也可以同时通过授权频谱和免授权频谱进行通信。网络设备和终端设备之间可以通过6千兆赫(gigahertz，GHz)以下的频谱进行通信，也可以通过6GHz以上的频谱进行通信，还可以同时使用6GHz以下的频谱和6GHz以上的频谱进行通信。本申请的实施例对网络设备和终端设备之间所使用的频谱资源不做限定。
可选的，本申请实施例中的终端设备或网络设备可以部署在陆地上，包括室内或室外、手持或车载；也可以部署在水面上；还可以部署在空中的飞机、气球和人造卫星上。本申请的实施例对终端设备或者网络设备的应用场景不做限定。
可选的，本申请实施例中的终端设备或网络设备的相关功能可以由一个设备实现，也可以由多个设备共同实现，还可以是由一个设备内的一个或多个功能模块实现，本申请实施例对此不作具体限定。可以理解的是，上述功能既可以是硬件设备中的网络元件，也可以是在专用硬件上运行的软件功能，或者是硬件与软件的结合，或者是平台(例如，云平台)上实例化的虚拟化功能。
例如，本申请实施例中的终端设备或网络设备的相关功能可以通过图3中的通信装置300来实现。图3所示为本申请实施例提供的通信装置300的结构示意图。该通信装置300包括一个或多个处理器301，通信线路302，以及至少一个通信接口(图3中仅是示例性的以包括通信接口304，以及一个处理器301为例进行说明)，可选的还可以包括存储器303。
处理器301可以是一个中央处理器(central processing unit，CPU)，微处理器，特定应用集成电路(application-specific integrated circuit，ASIC)，或一个或多个用于控制本申请方案程序执行的集成电路。
通信线路302可包括一通路，用于连接不同组件之间。
通信接口304，可以是收发模块用于与其他设备或通信网络通信，如以太网，RAN，无线局域网(wireless local area networks，WLAN)等。例如，所述收发模块可以是收发器、收发机一类的装置。可选的，所述通信接口304也可以是位于处理器301内的收 发电路，用以实现处理器的信号输入和信号输出。
存储器303可以是具有存储功能的装置。例如可以是只读存储器(read-only memory，ROM)或可存储静态信息和指令的其他类型的静态存储设备，随机存取存储器(random access memory，RAM)或者可存储信息和指令的其他类型的动态存储设备，也可以是电可擦可编程只读存储器(electrically erasable programmable read-only memory，EEPROM)、只读光盘(compact disc read-only memory，CD-ROM)或其他光盘存储、光碟存储(包括压缩光碟、激光碟、光碟、数字通用光碟、蓝光光碟等)、磁盘存储介质或者其他磁存储设备、或者能够用于携带或存储具有指令或数据结构形式的期望的程序代码并能够由计算机存取的任何其他介质，但不限于此。存储器可以是独立存在，通过通信线路302与处理器相连接。存储器也可以和处理器集成在一起。
其中，存储器303用于存储执行本申请方案的计算机执行指令，并由处理器301来控制执行。处理器301用于执行存储器303中存储的计算机执行指令，从而实现本申请实施例中提供的通信方法。
或者，本申请实施例中，也可以是处理器301执行本申请下述实施例提供的通信方法中的处理相关的功能，通信接口304负责与其他设备或通信网络通信，本申请实施例对此不作具体限定。
本申请实施例中的计算机执行指令也可以称之为应用程序代码，本申请实施例对此不作具体限定。
在具体实现中，作为一种实施例，处理器301可以包括一个或多个CPU，例如图3中的CPU0和CPU1。
在具体实现中，作为一种实施例，通信装置300可以包括多个处理器，例如图3中的处理器301和处理器308。这些处理器中的每一个可以是一个单核(single-CPU)处理器，也可以是一个多核(multi-CPU)处理器。这里的处理器可以指一个或多个设备、电路、和/或用于处理数据(例如计算机程序指令)的处理核。
在具体实现中，作为一种实施例，通信装置300还可以包括输出设备305和输入设备306。输出设备305和处理器301通信，可以以多种方式来显示信息。
上述的通信装置300可以是一个通用装置或者是一个专用装置。例如通信装置300可以是台式机、便携式电脑、网络服务器、掌上电脑(personal digital assistant，PDA)、移动手机、平板电脑、无线终端设备、嵌入式设备或具有图3中类似结构的设备。本申请实施例不限定通信装置300的类型。
下面将结合图1至图3对本申请实施例提供的通信方法进行具体阐述。
需要说明的是，本申请下述实施例中各个网元之间的消息名字或消息中各参数的名字等只是一个示例，具体实现中也可以是其他的名字，本申请实施例对此不做具体限定。
首先，本申请实施例适用于SL通信的所有场景。目前的SL通信包括图4所示的三种场景。下面分别对这三个场景进行介绍如下：
场景一、场景一为LTE eNB下的LTE SL中继通信场景。该场景下，eNB(即图2所示的通信系统中的网络设备)与中继终端设备(即图2所示的通信系统中的第二终端设备)之间通过LTE Uu口通信，中继终端设备与远端终端设备(即图2所示的 通信系统中的第二终端设备)通过LTE SL协议通信，即远端终端设备所连接的核心网类型为演进分组核心网(evolved packet core，EPC)。
场景二、场景二为NR gNB下的NR SL中继通信场景。该场景下，gNB(即图2所示的通信系统中的网络设备)与中继终端设备(即图2所示的通信系统中的第二终端设备)之间通过NR Uu口通信，中继终端设备与远端终端设备(即图2所示的通信系统中的第二终端设备)通过NR SL协议通信，即远端终端设备所连接的核心网类型为5G核心网(5G core，5GC)。
场景三、场景三为演进LTE(evolved LTE，eLTE)eNB下的NR SL中继通信场景。该场景下，eNB(即图2所示的通信系统中的网络设备)与中继终端设备(即图2所示的通信系统中的第二终端设备)之间通过LTE Uu口通信，中继终端设备与远端终端设备(即图2所示的通信系统中的第二终端设备)通过NR SL协议通信，即远端终端设备所连接的核心网类型为5GC。
应理解，上述实施例仅是示例性的提供了目前的SL通信的几个场景。在未来的通信系统中，还可能引入更多的场景，本申请实施例对此不做具体限定。
如图5所示，为本申请实施例提供的一种通信方法，包括如下步骤：
S501、第二终端设备获取第一SCI。第一SCI包括第一标识，第一标识用于指示第一消息为发现消息，发现消息用于指示第二终端设备为中继终端设备。
S502、第二终端设备向第一终端设备发送第一SCI和第一消息。相应的，第一终端设备接收来自第二终端设备的第一SCI和第一消息。
示例性的，本申请实施例中的第一消息可以为公告消息(announcement message)。
可选的，本申请实施例中，第二终端设备可以通过广播的方式广播第一消息和第一SCI，附近的第一终端设备可以接收第二终端设备广播的第一消息和第一SCI。
可选的，本申请实施例中的第一消息可以包括第一参数，第一参数用于确定第二终端设备是否满足第一终端设备的能力需求。该能力需求例如可以是切片能力需求、连接权限需求、或者支持建连接的网络设备的类型需求等，本申请实施例对此不作具体限定。
其中，本申请实施例中的第一参数可以包括为第二终端设备提供服务的网络的标识，为第二终端设备提供服务的网络的标识用于确定第二终端设备是否满足第一终端设备的连接权限需求。
可选的，本申请实施例中的第一参数还可以包括第二终端设备的网络切片能力信息或者第一指示信息中的至少一个，第一指示信息指示第二终端设备接入的网络设备为第一类型的网络设备或第二类型的网络设备。其中，第二终端设备的网络切片能力信息用于确定第二终端设备是否满足第一终端设备的切片能力需求，第一指示信息用于确定第二终端设备是否满足第一终端设备支持建连接的网络设备的类型需求。
可选的，本申请实施例中，第一指示信息指示第二终端设备接入的网络设备为第一类型的网络设备时，第一参数还可以包括第二终端设备接入的网络设备所连接的核心网类型。
示例性的，结合图4所示的三种场景，本申请实施例中，第一类型的网络设备例如可以为eNB，第二类型的网络设备例如可以为gNB。当第一指示信息指示第二终端 设备接入的网络设备为第一类型的网络设备时，第二终端设备接入的网络设备所连接的核心网类型例如可以为EPC或者5GC，在此统一说明，以下不再赘述。
可选的，本申请实施例中，第一指示信息指示第二终端设备接入的网络设备为第一类型的网络设备与第一指示信息指示第二终端设备的RRC连接类型为第一类型意义等价，第一指示信息指示第二终端设备接入的网络设备为第二类型的网络设备与第一指示信息指示第二终端设备的RRC连接类型为第二类型意义等价。比如，结合图4所示的三种场景，假设第一指示信息指示第二终端设备接入的网络设备为eNB，也意味着，第二终端设备的RRC连接类型为LTE；假设第一指示信息指示第二终端设备接入的网络设备为gNB，也意味着，第二终端设备的RRC连接类型为NR。换言之，结合图4所示的三种场景，假设第一指示信息指示第二终端设备的RRC连接类型为LTE，也意味着第二终端设备接入的网络设备为eNB；假设第一指示信息指示第二终端设备的RRC连接类型为NR，也意味着第二终端设备接入的网络设备为gNB，在此统一说明，以下不再赘述。
可选的，当本申请实施例中的第一消息为公告消息时，本申请实施例中的公告消息中除了携带第一参数，还可以携带现有的一些参数，如中继服务代码(relay service code)、邻近业务中继终端标识或消息源终端的信息等，中继服务代码表示一种公共安全服务的类型，邻近业务中继终端标识是第二终端设备为各种中继服务代码分配的不同标识，消息源终端的信息是根据归属公共陆地移动网(home public land mobile network，HPLMN)或第三方公共安全提供者应用服务器的策略为设备分配的用户信息标识(User Info ID)，具体可参考现有的实现方式，在此不予赘述。
S503、第一终端设备根据第一标识确定第一消息为发现消息。
本申请实施例中，由于第一标识携带在第一SCI中，第一终端设备接收到第一SCI之后，可以在PHY层解析第一SCI，因此第一终端设备在PHY层即可根据第一SCI中的第一标识获知第一消息为发现消息。
S504、第一终端设备根据第一参数，确定第二终端设备是否满足第一终端设备的能力需求。
可选的，本申请实施例中，第一终端设备根据第一参数，确定第二终端设备满足第一终端设备的能力需求，可以包括：第一终端设备根据为第二终端设备提供服务的网络的标识，确定为第二终端设备提供服务的网络在第一终端设备的连接权限内。
进一步的，当第一参数还包括第二终端设备的网络切片能力信息时，第一终端设备确定第二终端设备满足第一终端设备的能力需求还可以包括：第一终端设备根据第二终端设备的切片能力信息，确定第二终端设备的切片能力满足第一终端设备的切片能力需求。
进一步的，当第一参数还包括第一指示信息时，第一终端设备确定第二终端设备满足第一终端设备的能力需求还包括：当第一终端设备仅支持建连接的网络设备为第一类型的网络设备时，第一终端设备根据第一指示信息确定第二终端设备接入的网络设备为第一类型的网络设备；或者，当第一终端设备仅支持建连接的网络设备为第二类型的网络设备时，第一终端设备根据第一指示信息确定第二终端设备接入的网络设备为第二类型的网络设备；或者，当第一终端设备同时支持建连接的网络设备为第一 类型的网络设备和第二类型的网络设备时，第一终端设备根据第一指示信息确定第二终端设备接入的网络设备为第一类型的网络设备或第二类型的网络设备。
可选的，本申请实施例中，第一终端设备根据第一参数，确定第二终端设备不满足第一终端设备的能力需求，可以包括：第一终端设备根据为第二终端设备提供服务的网络的标识，确定为第二终端设备提供服务的网络不在第一终端设备的连接权限内。
或者，当第一参数还包括第二终端设备的网络切片能力信息时，第一终端设备根据第一参数，确定第二终端设备不满足第一终端设备的能力需求，可以包括：第一终端设备根据为第二终端设备提供服务的网络的标识，确定为第二终端设备提供服务的网络在第一终端设备的连接权限内，但是第一终端设备根据第二终端设备的切片能力信息，确定第二终端设备的切片能力不满足第一终端设备的切片能力需求。
或者，当第一参数还包括第一指示信息时，第一终端设备根据第一参数，确定第二终端设备不满足第一终端设备的能力需求，可以包括：第一终端设备根据为第二终端设备提供服务的网络的标识，确定为第二终端设备提供服务的网络在第一终端设备的连接权限内，但是当第一终端设备仅支持建连接的网络设备为第一类型的网络设备时，第一终端设备根据第一指示信息确定第二终端设备接入的网络设备为第二类型的网络设备；或者，当第一终端设备仅支持建连接的网络设备为第二类型的网络设备时，第一终端设备根据第一指示信息确定第二终端设备接入的网络设备为第一类型的网络设备。
需要说明的是，上述步骤S501-S504以一个第二终端设备与第一终端设备交互为例进行说明。当然，可能存在多个第二终端设备与第一终端设备交互，其中任意一个第二终端设备与第一终端设备的交互流程均可参考上述步骤S501-S504，在此不再赘述。
进一步的，在完成上述中继发现之后，本申请实施例提供的通信方法还可以包括如步骤S505所示的中继选择过程：
S505、第一终端设备根据预设准则从满足第一终端设备的能力需求的第二终端设备中选择目标第二终端设备。
可选的，本申请实施例中，预设准则中可以包括第一预设准则，第一预设准则用于确定优先级较高的一个或多个第二终端设备。
一种可能的实现方式中，优先级较高的一个或多个第二终端设备即为上述的目标第二终端设备。
另一种可能的实现方式中，预设准则中还可以包括第二预设准则，第二预设准则用于从优先级较高的一个或多个第二终端设备中选择目标第二终端设备。
可选的，本申请实施例中，第一预设准则可以包括以下一项或多项：
接入第一网络设备的第二终端设备的优先级较高，第一网络设备为第一终端设备接入的网络设备。
接入的网络设备所连接的核心网类型为目标核心网类型的第二终端设备的优先级较高。
资源池信道繁忙程度不大于第一阈值的第二终端设备的优先级较高。
功率测量值不小于第二阈值的第二终端设备的优先级较高。
或者，当第一终端设备同时支持建连接的网络设备为第一类型的网络设备或第二类型的网络设备时，接入目标类型的网络设备的第二终端设备的优先级较高，目标类型为第一终端设备默认的网络设备类型；或者，目标类型为第一终端设备的高优先级业务对应的网络设备类型。
其中，本申请实施例中，通过设置接入第一网络设备的第二终端设备的优先级较高，可以使得选择的目标第二终端设备接入的网络设备与第一终端设备接入的网络设备相同(假设均为网络设备1)，进而使得第一终端设备支持同时建立与网络设备1的直接通信以及基于第二终端设备的中继通信的双连接场景。
其中，本申请实施例中，通过设置接入的网络设备所连接的核心网类型为目标核心网类型的第二终端设备的优先级较高，可以使得选择的目标第二终端设备所连接的核心网类型为目标核心网类型。示例性的，考虑到5GC的业务类型较为丰富，比如5GC能够提供网络切片业务，因此本申请实施例中的目标核心网类型可以选择为5GC。
其中，本申请实施例中，通过设置资源池信道繁忙程度(例如可以为信道繁忙比例(channel busy ratio,CBR))不大于第一阈值的第二终端设备的优先级较高，可以使得选择的目标第二终端设备对应的资源池信道繁忙程度不大于第一阈值。换言之，选择的目标第二终端设备对应的资源池繁忙程度相对较小，这样可以避免第一终端设备长时间等待第二终端设备的资源调度。
其中，本申请实施例中，通过设置功率测量值(例如可以为SD-RSRP值)不小于第二阈值的第二终端设备的优先级较高，可以使得选择的目标第二终端设备对应的功率测量值不小于第二阈值。换言之，选择的目标第二终端设备对应的功率测量值相对较高，这样可以使得第一终端设备与第二终端设备的通信信道质量较高。
其中，本申请实施例中，当第一终端设备同时支持建连接的网络设备为第一类型的网络设备或第二类型的网络设备时，通过设置接入目标类型的网络设备的第二终端设备的优先级较高，可以使得选择的目标第二终端设备是接入目标类型的网络设备的第二终端设备。比如，在目标类型为第一终端设备默认的网络设备类型的情况下，当第一终端设备默认使用LTE服务时，目标第二终端设备是连接eNB的第二终端设备；当第一终端设备默认使用NR服务时，目标第二终端设备是连接gNB的第二终端设备。或者，比如，在目标类型为第一终端设备的高优先级业务对应的网络设备类型的情况下，当第一终端设备的LTE业务的优先级高于NR业务的优先级时，目标第二终端设备是连接eNB的第二终端设备；当第一终端设备的NR业务的优先级高于LTE业务的优先级时，目标第二终端设备是连接gNB的第二终端设备。
可选的，本申请实施例中，第二预设准则可以包括：
目标第二终端设备为优先级较高的一个或多个第二终端设备中对应的资源池信道繁忙程度最小的第二终端设备；或者，目标第二终端设备为优先级较高的一个或多个第二终端设备中对应的功率测量值最大的第二终端设备。
其中，当目标第二终端设备为优先级较高的一个或多个第二终端设备中对应的资源池信道繁忙程度最小的第二终端设备时，基于第二预设准则进一步确定出的目标第二终端设备可以使得第一终端设备与信道繁忙程度最低的第二终端设备建立连接，从而使得第一终端设备能够最高效的获得中继通信资源调度。
其中，当目标第二终端设备为优先级较高的一个或多个第二终端设备中对应的功率测量值最大的第二终端设备基于第二预设准则进一步确定出的目标第二终端设备可以使得第一终端设备与信道质量最佳的第二终端设备建立连接，从而使得第一终端设备的中继通信信道质量最佳。
当然，可选的，本申请实施例中，可以不用先基于第一预设准则进行筛选之后，再基于第二预设准则从优先级较高的一个或多个第二终端设备中选择目标第二终端设备。而是预设准则中可以包括：目标第二终端设备为满足该第一终端设备的能力需求的多个第二终端设备中对应的资源池信道繁忙程度最小的第二终端设备；或者，目标第二终端设备为满足该第一终端设备的能力需求的多个第二终端设备中对应的功率测量值最大的第二终端设备。在此统一说明，本申请实施例对此不做具体限定。
一方面，现有技术中在使用已有的PC5-U实现中继发现的过程中可能引入的较大时延，本申请实施例中，第二终端设备向第一终端设备发送第一消息时，可以同时向第一终端设备发送包括第一标识的第一SCI，第一标识用于指示第一消息为发现消息。由于第一标识携带在第一SCI中，第一终端设备接收到第一SCI之后，可以在PHY层解析第一SCI，因此第一终端设备在PHY层即可根据第一SCI中的第一标识获知第一消息为发现消息，从而避免了现有技术中在使用已有的PC5-U实现中继发现的过程中可能引入的较大时延。另一方面，相比于目前的公共安全应用场景，包括V2X在内未来中继通信应用场景额外要求网络设备、第一终端设备和第二终端设备之间进行能力匹配。然而，目前在NR中继通信场景中，没有方案解决网络设备、第一终端设备和第二终端设备的能力匹配问题。本申请实施例中的第一消息中可以携带第一参数，第一终端设备根据第一参数，可以确定第二终端设备是否满足第一终端设备的能力需求，从而解决了网络设备、第一终端设备和第二终端设备的能力匹配问题。再一方面，目前在NR中继通信场景中，没有方案解决当满足第一终端设备的能力需求的第二终端设备有多个时，如何选择最合适的目标第二终端设备的问题。本申请实施例中，第一终端设备可以根据预设准则从满足第一终端设备的能力需求的第二终端设备中选择目标第二终端设备，从而解决了目标第二终端设备的选择问题。
其中，上述步骤S501至S505中的第一终端设备或第二终端设备的动作可以由图3所示的通信装置300中的处理器301调用存储器303中存储的应用程序代码来执行，本申请实施例对此不作具体限定。
如图6所示，为本申请实施例提供的另一种通信方法，包括如下步骤：
S601、第二终端设备确定传输第一消息的第一资源，第一资源为专用于传输发现消息的资源，发现消息用于指示第二终端设备为中继终端设备。
S602、第二终端设备在第一资源上向第一终端设备发送第一消息。相应的，第一终端设备在第一资源上接收来自第二终端设备的第一消息。
示例性的，本申请实施例中的第一消息可以为公告消息(announcement message)。
可选的，本申请实施例中，第二终端设备可以通过广播的方式广播第一消息，附近的第一终端设备可以接收第二终端设备广播的第一消息。
可选的，本申请实施例中的第二终端设备广播第一消息时，还可以同时广播SCI，具体可参考现有的实现方式，在此不予赘述。
可选的，本申请实施例中的第一消息可以包括第一参数，第一参数的相关描述可参考图5所示的实施例，在此不再赘述。
可选的，当本申请实施例中的第一消息为公告消息时，本申请实施例中的公告消息中除了携带第一参数，还可以携带现有的一些参数，相关描述可参考图5所示的实施例，在此不再赘述。
S603、第一终端设备根据传输第一消息的第一资源确定第一消息为发现消息。
本申请实施例中，由于第一终端设备接收到第一消息之后，可以在PHY层获知传输第一消息的第一资源，而第一资源为专用于传输发现消息的资源，因此第一终端设备在PHY层即可根据第一资源获知第一消息为发现消息。
S604-S605、同图5所示的实施例中的步骤S504-S505，相关描述可参考图5所示的实施例，在此不再赘述。
一方面，现有技术中在使用已有的PC5-U实现中继发现的过程中可能引入的较大时延，本申请实施例中，第二终端设备在第一资源上向第一终端设备发送第一消息。第一终端设备接收到第一消息之后，可以在PHY层获知传输第一消息的第一资源，由于第一资源为专用于传输发现消息的资源，因此第一终端设备在PHY层即可根据第一资源获知第一消息为发现消息，从而避免了现有技术中在使用已有的PC5-U实现中继发现的过程中可能引入的较大时延。另一方面，相比于目前的公共安全应用场景，包括V2X在内未来中继通信应用场景额外要求网络设备、第一终端设备和第二终端设备之间进行能力匹配。然而，目前在NR中继通信场景中，没有方案解决网络设备、第一终端设备和第二终端设备的能力匹配问题。本申请实施例中的第一消息中可以携带第一参数，第一终端设备根据第一参数，可以确定第二终端设备是否满足第一终端设备的能力需求，从而解决了网络设备、第一终端设备和第二终端设备的能力匹配问题。再一方面，目前在NR中继通信场景中，没有方案解决当满足第一终端设备的能力需求的第二终端设备有多个时，如何选择最合适的目标第二终端设备的问题。本申请实施例中，第一终端设备可以根据预设准则从满足第一终端设备的能力需求的第二终端设备中选择目标第二终端设备，从而解决了目标第二终端设备的选择问题。
其中，上述步骤S601至S605中的第一终端设备或第二终端设备的动作可以由图3所示的通信装置300中的处理器301调用存储器303中存储的应用程序代码来执行，本申请实施例对此不作具体限定。
如图7所示，为本申请实施例提供的另一种通信方法，包括如下步骤：
S701、第一终端设备向第二终端设备发送第二消息。相应的，第二终端设备接收来自第一终端设备的第二消息。其中，第二消息携带第二参数，第二参数用于确定第二终端设备是否满足第一终端设备的能力需求。该能力需求的相关描述可参考图5所示的实施例，在此不再赘述。
示例性的，本申请实施例中的第二消息例如可以为请求消息(solicitation message)。
可选的，本申请实施例中，第一终端设备可以通过广播的方式向已知的附近的第二终端设备广播第二消息，附近的第二终端设备可以接收第一终端设备广播的第二消息。
可选的，本申请实施例中的第一终端设备广播第二消息时，还可以同时广播SCI， 具体可参考现有的实现方式，在此不予赘述。
可选的，本申请实施例中的第二参数可以包括允许第一终端设备接入的网络的标识列表，该允许第一终端设备接入的网络的标识列表用于确定第二终端设备是否满足第一终端设备的连接权限需求。
可选的，本申请实施例中的第二参数还可以包括第二指示信息或者第一终端设备的切片能力需求中的至少一个，第二指示信息指示第一终端设备支持建连接的网络设备为第一类型的网络设备和/或第二类型的网络设备。其中，第一终端设备的切片能力需求用于确定第二终端设备是否满足第一终端设备的切片能力需求，第二指示信息用于确定第二终端设备是否满足第一终端设备支持建连接的网络设备的类型需求。
可选的，当本申请实施例中的第二消息为请求消息时，本申请实施例中的请求消息中除了携带第二参数，还可以携带现有的一些参数，如中继服务代码(relay service code)、邻近业务中继终端标识或消息源终端的信息等，中继服务代码表示一种公共安全服务的类型，邻近业务中继终端标识是第二终端设备为各种中继服务代码分配的不同标识，消息源终端的信息是根据HPLMN或第三方公共安全提供者应用服务器的策略为设备分配的用户信息标识(User Info ID)，具体可参考现有的实现方式，在此不予赘述。
可选的，一种可能的实现方式中，本申请实施例提供的通信方法还包括：第一终端设备向第二终端设备发送第二SCI，第二SCI包括第一标识，第一标识用于指示第二消息为发现消息。
可选的，另一种可能的实现方式中，本申请实施例中，第一终端设备向第二终端设备发送第二消息，包括：第一终端设备在第二资源上向第二终端设备发送第二消息，其中，第二资源为专用于传输发现消息的资源。
S702、第二终端设备确定第二消息为发现消息。
可选的，一种可能的实现方式中，当第一终端设备向第二终端设备发送第二SCI时，第二终端设备接收来自第一终端设备的第二SCI。进而，第二终端设备确定第二消息为发现消息，包括：第二终端设备根据第二SCI中的第一标识确定第二消息为发现消息。由于第一标识携带在第二SCI中，第二终端设备接收到第二SCI之后，可以在PHY层解析第二SCI，因此第二终端设备在PHY层即可根据第二SCI中的第一标识获知第二消息为发现消息。
可选的，另一种可能的实现方式中，当第一终端设备在第二资源上向第二终端设备发送第二消息时，第二终端设备确定第二消息为发现消息，包括：第二终端设备根据传输第二消息的第二资源确定第二消息为发现消息。由于第一终端设备接收到第二消息之后，可以在PHY层获知传输第二消息的第二资源，而第一资源为专用于传输发现消息的资源，因此第二终端设备在PHY层即可根据第二资源获知第二消息为发现消息。
本申请实施例示例性的提供了第二终端设备在PHY层识别第二消息为发现消息的两种实现方式。当然，本申请实施例中，第二终端设备也可以按照现有的方式识别第二消息为发现消息，本申请实施例对此不做具体限定。
S703、第二终端设备根据第二参数，确定第二终端设备是否满足第一终端设备的 能力需求。
可选的，本申请实施例中，第二终端设备根据第二参数，确定第二终端设备满足第一终端设备的能力需求，可以包括：第二终端设备根据允许第一终端设备接入的网络的标识列表，确定为第二终端设备提供服务的网络在第一终端设备的连接权限内。
进一步的，当第二参数还包括第一终端设备的切片能力需求时，第二终端设备确定第二终端设备满足第一终端设备的能力需求还可以包括：第二终端设备根据第一终端设备的切片能力需求，确定第二终端设备的切片能力满足第一终端设备的切片能力需求。
进一步的，当第二参数还包括第二指示信息时，第二终端设备确定第二终端设备满足第一终端设备的能力需求还可以包括：当第二指示信息指示第一终端设备仅支持建连接的网络设备为第一类型的网络设备时，第二终端设备确定第二终端设备接入的网络设备为第一类型的网络设备；或者，当第二指示信息指示第一终端设备仅支持建连接的网络设备为第二类型的网络设备时，第二终端设备确定第二终端设备接入的网络设备为第二类型的网络设备；或者，当第二指示信息指示第一终端设备同时支持建连接的网络设备为第一类型的网络设备和第二类型的网络设备时，第二终端设备确定第二终端设备接入的网络设备为第一类型的网络设备或者第二类型的网络设备。
可选的，本申请实施例中，第二终端设备根据第二参数，确定第二终端设备不满足第一终端设备的能力需求，可以包括：第二终端设备根据允许第一终端设备接入的网络的标识列表，确定为第二终端设备提供服务的网络不在第一终端设备的连接权限内。
或者，当第二参数还包括第一终端设备的切片能力需求时，第二终端设备根据第二参数，确定第二终端设备不满足第一终端设备的能力需求，可以包括：第二终端设备根据允许第一终端设备接入的网络的标识列表，确定为第二终端设备提供服务的网络在第一终端设备的连接权限内，但是第二终端设备根据第一终端设备的切片能力需求，确定第二终端设备的切片能力不满足第一终端设备的切片能力需求。
或者，当第二参数还包括第二指示信息时，第二终端设备根据第二参数，确定第二终端设备不满足第一终端设备的能力需求，可以包括：第二终端设备根据允许第一终端设备接入的网络的标识列表，确定为第二终端设备提供服务的网络在第一终端设备的连接权限内，但是当第二指示信息指示第一终端设备仅支持建连接的网络设备为第一类型的网络设备时，第二终端设备确定第二终端设备接入的网络设备为第二类型的网络设备；或者，当第二指示信息指示第一终端设备仅支持建连接的网络设备为第二类型的网络设备时，第二终端设备确定第二终端设备接入的网络设备为第一类型的网络设备。
需要说明的是，上述步骤S701-S703以第一终端设备与一个第二终端设备交互为例进行说明。当然，可能存在多个第二终端设备与第一终端设备交互，其中任意一个第二终端设备与第一终端设备的交互流程均可参考上述步骤S701-S703，在此不再赘述。
假设图7所示的实施例中的第二终端设备满足第一终端设备的能力需求，则进一步的，本申请实施例提供的通信方法还包括如下步骤：
S704、第二终端设备获取第一SCI。第一SCI包括第一标识，第一标识用于指示第一消息为发现消息，发现消息用于指示第二终端设备为中继终端设备。
S705、第二终端设备向第一终端设备发送第一SCI和第一消息。相应的，第一终端设备接收来自第二终端设备的第一SCI和第一消息。
示例性的，本申请实施例中的第一消息可以为响应消息(response message)。
可选的，本申请实施例中的第一消息可以包括第一参数，第一参数的相关描述可参考图5所示的实施例，在此不再赘述。
可选的，当本申请实施例中的第一消息为响应消息时，本申请实施例中的响应消息中除了携带第一参数，还可以携带现有的一些参数，如邻近业务中继终端标识、消息源终端的信息，具体可参考现有的实现方式，在此不予赘述。
S706-S707、同图5所示的实施例中的步骤S503-S504，相关描述可参考图5所示的实施例，在此不再赘述。
进一步的，在完成上述中继发现之后，本申请实施例提供的通信方法还可以包括如步骤S708所示的中继选择过程：
S708、同图5所示的实施例中的步骤S505，相关描述可参考图5所示的实施例，在此不再赘述。
一方面，现有技术中在使用已有的PC5-U实现中继发现的过程中可能引入的较大时延，本申请实施例中，第二终端设备向第一终端设备发送第一消息时，可以同时向第一终端设备发送包括第一标识的第一SCI，第一标识用于指示第一消息为发现消息。由于第一标识携带在第一SCI中，第一终端设备接收到第一SCI之后，可以在PHY层解析第一SCI，因此第一终端设备在PHY层即可根据第一SCI中的第一标识获知第一消息为发现消息，从而避免了现有技术中在使用已有的PC5-U实现中继发现的过程中可能引入的较大时延。另一方面，相比于目前的公共安全应用场景，包括V2X在内未来中继通信应用场景额外要求网络设备、第一终端设备和第二终端设备之间进行能力匹配。然而，目前在NR中继通信场景中，没有方案解决网络设备、第一终端设备和第二终端设备的能力匹配问题。本申请实施例中的第一消息中可以携带第一参数，第一终端设备根据第一参数，可以确定第二终端设备是否满足第一终端设备的能力需求，从而解决了网络设备、第一终端设备和第二终端设备的能力匹配问题。再一方面，目前在NR中继通信场景中，没有方案解决当满足第一终端设备的能力需求的第二终端设备有多个时，如何选择最合适的目标第二终端设备的问题。本申请实施例中，第一终端设备可以根据预设准则从满足第一终端设备的能力需求的第二终端设备中选择目标第二终端设备，从而解决了目标第二终端设备的选择问题。
其中，上述步骤S701至S708中的第一终端设备或第二终端设备的动作可以由图3所示的通信装置300中的处理器301调用存储器303中存储的应用程序代码来执行，本申请实施例对此不作具体限定。
如图8所示，为本申请实施例提供的另一种通信方法，包括如下步骤：
S801-S803、同图7所示的实施例中的步骤S701-S703，相关描述可参考图7所示的实施例，在此不再赘述。
S804、第二终端设备确定传输第一消息的第一资源，第一资源为专用于传输发现 消息的资源，发现消息用于指示第二终端设备为中继终端设备。
S805、第二终端设备在第一资源上向第一终端设备发送第一消息。相应的，第一终端设备在第一资源上接收来自第二终端设备的第一消息。
示例性的，本申请实施例中的第一消息可以为响应消息(response message)。
可选的，本申请实施例中的第一消息可以包括第一参数，第一参数的相关描述可参考图5所示的实施例，在此不再赘述。
可选的，当本申请实施例中的第一消息为响应消息时，本申请实施例中的响应消息中除了携带第一参数，还可以携带现有的一些参数，如邻近业务中继终端标识、消息源终端的信息，具体可参考现有的实现方式，在此不予赘述。
可选的，本申请实施例中的第二终端设备向第一终端设备发送第一消息时，还可以同时发送SCI，具体可参考现有的实现方式，在此不予赘述。
S806-S807、同图6所示的实施例中的步骤S603-S604，相关描述可参考图6所示的实施例，在此不再赘述。
进一步的，在完成上述中继发现之后，本申请实施例提供的通信方法还可以包括如步骤S808所示的中继选择过程：
S808、同图5所示的实施例中的步骤S505，相关描述可参考图5所示的实施例，在此不再赘述。
一方面，现有技术中在使用已有的PC5-U实现中继发现的过程中可能引入的较大时延，本申请实施例中，第二终端设备在第一资源上向第一终端设备发送第一消息。第一终端设备接收到第一消息之后，可以在PHY层获知传输第一消息的第一资源，由于第一资源为专用于传输发现消息的资源，因此第一终端设备在PHY层即可根据第一资源获知第一消息为发现消息，从而避免了现有技术中在使用已有的PC5-U实现中继发现的过程中可能引入的较大时延。另一方面，相比于目前的公共安全应用场景，包括V2X在内未来中继通信应用场景额外要求网络设备、第一终端设备和第二终端设备之间进行能力匹配。然而，目前在NR中继通信场景中，没有方案解决网络设备、第一终端设备和第二终端设备的能力匹配问题。本申请实施例中的第一消息中可以携带第一参数，第一终端设备根据第一参数，可以确定第二终端设备是否满足第一终端设备的能力需求，从而解决了网络设备、第一终端设备和第二终端设备的能力匹配问题。再一方面，目前在NR中继通信场景中，没有方案解决当满足第一终端设备的能力需求的第二终端设备有多个时，如何选择最合适的目标第二终端设备的问题。本申请实施例中，第一终端设备可以根据预设准则从满足第一终端设备的能力需求的第二终端设备中选择目标第二终端设备，从而解决了目标第二终端设备的选择问题。
其中，上述步骤S801至S808中的第一终端设备或第二终端设备的动作可以由图3所示的通信装置300中的处理器301调用存储器303中存储的应用程序代码来执行，本申请实施例对此不作具体限定。
需要说明的是，在图5至图8所示的任意一个实施例中，均解决了NR中继通信场景中，网络设备、第一终端设备和第二终端设备的能力匹配问题；NR中继通信场景中，目标第二终端设备的选择问题；以及现有技术中在使用已有的PC5-U实现中继发现的过程中可能引入的较大时延的问题。然而，针对上述三个技术问题，本申请实施 例提供的解决方案可以相互解耦。换言之，可以采用本申请实施例提供的技术方案解决上述三个问题中的任意一个问题，采用本申请实施例之外的其他技术方案解决上述三个问题中的其他两个问题。或者，可以采用本申请实施例提供的技术方案解决上述三个问题中的其中两个问题，采用本申请实施例之外的其他技术方案解决上述三个问题中的另外一个问题，本申请实施例对此不作具体限定。
可选的，本申请实施例中，除了采用图5至图8所示的实施例中提供的发现消息的识别方法，本申请实施例还提供一种发现消息的识别方法，具体包括：为发现消息(discovery message)分配默认的目的标识(Destination ID)，该默认的Destination ID用于指示相应的消息(如上述的第一消息或第二消息)为发现消息。由于Destination ID是在MAC层封装的，因此当第一终端设备接收到第一消息之后，可以在MAC层根据该Destination ID识别第一消息为发现消息；或者，当第二终端设备接收到第二消息之后，可以在MAC层根据该Destination ID识别第二消息为发现消息，本申请实施例对此不做具体限定。
可选的，本申请实施例中，除了采用图5至图8所示的实施例中提供的发现消息的识别方法，本申请实施例还提供一种发现消息的识别方法，具体包括：为发现消息提供专用的逻辑信道，该逻辑信道用于指示相应的消息(如上述的第一消息或第二消息)为发现消息。由于逻辑信道是在MAC层解析的，因此当第一终端设备接收到第一消息之后，可以在MAC层根据该专用的逻辑信道识别第一消息为发现消息；或者，当第二终端设备接收到第二消息之后，可以在MAC层根据该专用的逻辑信道识别第二消息为发现消息，本申请实施例对此不做具体限定。
可以理解的是，以上各个实施例中，由第一终端设备实现的方法和/或步骤，也可以由可用于第一终端设备的部件(例如芯片或者电路)实现；由第二终端设备实现的方法和/或步骤，也可以由可用于第二终端设备的部件(例如芯片或者电路)实现。
上述主要从各个网元之间交互的角度对本申请实施例提供的方案进行了介绍。相应的，本申请实施例还提供了通信装置，该通信装置用于实现上述各种方法。该通信装置可以为上述方法实施例中的第一终端设备，或者包含上述第一终端设备的装置，或者为可用于第一终端设备的部件；或者，该通信装置可以为上述方法实施例中的第二终端设备，或者包含上述第二终端设备的装置，或者为可用于第二终端设备的部件可以理解的是，该通信装置为了实现上述功能，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，本申请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申请的范围。
本申请实施例可以根据上述方法实施例中对通信装置进行功能模块的划分，例如，可以对应各个功能划分各个功能模块，也可以将两个或两个以上的功能集成在一个处理模块中。上述集成的模块既可以采用硬件的形式实现，也可以采用软件功能模块的形式实现。需要说明的是，本申请实施例中对模块的划分是示意性的，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式。
图9示出了一种通信装置90的结构示意图。该通信装置90包括收发模块901和处理模块902。所述收发模块901，也可以称为收发单元用以实现收发功能，例如可以是收发电路，收发机，收发器或者通信接口。
其中，以通信装置90为上述方法实施例中的第一终端设备为例，一种可能的实现方式中：
收发模块901，用于接收来自第二终端设备的第一SCI和第一消息，第一SCI包括第一标识，第一标识用于指示第一消息为发现消息，发现消息用于指示第二终端设备为中继终端设备。处理模块902，用于根据第一标识确定第一消息为发现消息。
另一种可能的实现方式中：
收发模块901，用于接收来自第二终端设备的第一消息；处理模块902，用于根据传输第一消息的第一资源确定第一消息为发现消息，其中，第一资源为专用于传输发现消息的资源，发现消息用于指示第二终端设备为中继终端设备。
可选的，第一消息包括第一参数；处理模块902，还用于根据第一参数，确定第二终端设备满足第一终端设备的能力需求或者第二终端设备不满足第一终端设备的能力需求。
可选的，第一参数包括为第二终端设备提供服务的网络的标识；相应的，处理模块902，用于根据第一参数，确定第二终端设备满足第一终端设备的能力需求，包括：处理模块902，用于根据为第二终端设备提供服务的网络的标识，确定为第二终端设备提供服务的网络在第一终端设备的连接权限内。
可选的，第一参数还包括第二终端设备的网络切片能力信息；处理模块902，用于确定第二终端设备满足第一终端设备的能力需求还包括：处理模块902，还用于根据第二终端设备的切片能力信息，确定第二终端设备的切片能力满足第一终端设备的切片能力需求。
可选的，第一参数还包括第一指示信息，第一指示信息指示第二终端设备接入的网络设备为第一类型的网络设备或第二类型的网络设备；处理模块902，用于确定第二终端设备满足第一终端设备的能力需求还包括：处理模块902，用于当第一终端设备仅支持建连接的网络设备为第一类型的网络设备时，根据第一指示信息确定第二终端设备接入的网络设备是否为第一类型的网络设备；或者，处理模块902，用于当第一终端设备仅支持建连接的网络设备为第二类型的网络设备时，根据第一指示信息确定第二终端设备接入的网络设备为第二类型的网络设备；或者，处理模块902，用于当第一终端设备同时支持建连接的网络设备为第一类型的网络设备和第二类型的网络设备时，根据第一指示信息确定第二终端设备接入的网络设备为第一类型的网络设备或第二类型的网络设备。
可选的，收发模块901，还用于向第二终端设备发送第二消息，第二消息携带第二参数，第二参数用于确定第二终端设备满足第一终端设备的能力需求。
可选的，收发模块901，用于向第二终端设备发送第二消息，包括：收发模块901，用于在第二资源上向第二终端设备发送第二消息，第二资源为专用于传输发现消息的资源。
可选的，收发模块901，还用于向第二终端设备发送第二SCI，第二SCI包括第一 标识，第一标识用于指示第二消息为发现消息。
可选的，处理模块902，还用于根据预设准则从满足第一终端设备的能力需求的多个第二终端设备中选择目标第二终端设备。
又一种可能的实现方式中：
收发模块901，用于接收来自第二终端设备的第一消息，第一消息中包括第一参数；处理模块902，用于根据第一参数，确定第二终端设备满足该第一终端设备的能力需求或者第二终端设备不满足该第一终端设备的能力需求。
其中，以通信装置90为上述方法实施例中的第二终端设备为例，一种可能的实现方式中：
处理模块902，用于获取第一SCI，第一SCI包括第一标识，第一标识用于指示第一消息为发现消息，发现消息用于指示第二终端设备为中继终端设备；收发模块901，用于向第一终端设备发送第一SCI和第一消息。
另一种可能的实现方式中：
处理模块902，用于确定第一资源，第一资源为专用于传输发现消息的资源，发现消息用于指示第二终端设备为中继终端设备；收发模块901，用于在第一资源上向第一终端设备发送第一消息。
可选的，收发模块901，还用于接收来自第一终端设备的第二消息，第二消息携带第二参数；处理模块902，还用于确定第二消息为发现消息；处理模块902，还用于根据第二参数，确定第二终端设备满足第一终端设备的能力需求。
可选的，收发模块901，用于接收来自第一终端设备的第二SCI，第二SCI包括第一标识，第一标识用于指示第二消息为发现消息；处理模块902，还用于根据第一标识，确定第二消息为发现消息。
可选的，处理模块902，还用于根据传输第二消息的第二资源确定第二消息为发现消息，第二资源为专用于传输发现消息的资源。
可选的，第二参数包括允许第一终端设备接入的网络的标识列表；相应的，处理模块902，用于根据第二参数，确定第二终端设备满足第一终端设备的能力需求，包括：处理模块902，用于根据允许第一终端设备接入的网络的标识列表，确定为第二终端设备提供服务的网络在第一终端设备的连接权限内。
可选的，第二参数还包括第一终端设备的切片能力需求；处理模块902用于确定第二终端设备满足第一终端设备的能力需求还包括：处理模块902，用于根据第一终端设备的切片能力需求，确定第二终端设备的切片能力满足第一终端设备的切片能力需求。
可选的，第二参数还包括第二指示信息，第二指示信息指示第一终端设备支持建连接的网络设备为第一类型的网络设备和/或第二类型的网络设备；处理模块902，用于确定第二终端设备满足第一终端设备的能力需求还包括：处理模块902，用于当第二指示信息指示第一终端设备仅支持建连接的网络设备为第一类型的网络设备时，确定第二终端设备接入的网络设备为第一类型的网络设备；或者，处理模块902，用于当第二指示信息指示第一终端设备仅支持建连接的网络设备为第二类型的网络设备时，确定第二终端设备接入的网络设备为第二类型的网络设备；或者，处理模块902，用 于当第二指示信息指示第一终端设备同时支持建连接的网络设备为第一类型的网络设备和第二类型的网络设备时，确定第二终端设备接入的网络设备为第一类型的网络设备或者第二类型的网络设备。
又一种可能的实现方式中：
处理模块902，用于确定第一参数；收发模块901，用于向第一终端设备发送第一消息，第一消息中包括第一参数，第一参数用于确定该第二终端设备满足该第一终端设备的能力需求或者该第二终端设备不满足该第一终端设备的能力需求。
其中，上述方法实施例涉及的各步骤的所有相关内容均可以援引到对应功能模块的功能描述，在此不再赘述。
在本实施例中，该通信装置90以采用集成的方式划分各个功能模块的形式来呈现。这里的“模块”可以指特定ASIC，电路，执行一个或多个软件或固件程序的处理器和存储器，集成逻辑电路，和/或其他可以提供上述功能的器件。在一个简单的实施例中，本领域的技术人员可以想到该通信装置90可以采用图3所示的通信装置300的形式。
比如，图3所示的通信装置300中的处理器301可以通过调用存储器303中存储的计算机执行指令，使得通信装置300执行上述方法实施例中的通信方法。
具体的，图9中的收发模块901和处理模块902的功能/实现过程可以通过图3所示的通信装置300中的处理器301调用存储器303中存储的计算机执行指令来实现。或者，图9中的处理模块902的功能/实现过程可以通过图3所示的通信装置300中的处理器301调用存储器303中存储的计算机执行指令来实现，图9中的收发模块901的功能/实现过程可以通过图3中所示的通信装置300中的通信接口304来实现。
由于本实施例提供的通信装置90可执行上述方法实施例中的通信方法，因此其所能获得的技术效果可参考上述方法实施例，在此不再赘述。
可选的，图10示出了一种通信装置100的结构示意图。该通信装置100包括处理模块1001。其中，处理模块1001，用于确定满足第一终端设备的能力需求的多个第二终端设备；并根据预设准则从满足第一终端设备的能力需求的多个第二终端设备中选择目标第二终端设备。
其中，上述方法实施例涉及的各步骤的所有相关内容均可以援引到对应功能模块的功能描述，在此不再赘述。
在本实施例中，该通信装置100以采用集成的方式划分各个功能模块的形式来呈现。这里的“模块”可以指特定ASIC，电路，执行一个或多个软件或固件程序的处理器和存储器，集成逻辑电路，和/或其他可以提供上述功能的器件。在一个简单的实施例中，本领域的技术人员可以想到该通信装置100可以采用图3所示的通信装置300的形式。
比如，图3所示的通信装置300中的处理器301可以通过调用存储器303中存储的计算机执行指令，使得通信装置300执行上述方法实施例中的通信方法。
具体的，图10中的处理模块1001的功能/实现过程可以通过图3所示的通信装置300中的处理器301调用存储器303中存储的计算机执行指令来实现。
由于本实施例提供的通信装置100可执行上述方法实施例中的通信方法，因此其所能获得的技术效果可参考上述方法实施例，在此不再赘述。
需要说明的是，以上模块或单元的一个或多个可以软件、硬件或二者结合来实现。当以上任一模块或单元以软件实现的时候，所述软件以计算机程序指令的方式存在，并被存储在存储器中，处理器可以用于执行所述程序指令并实现以上方法流程。该处理器可以内置于SoC(片上系统)或ASIC，也可是一个独立的半导体芯片。该处理器内处理用于执行软件指令以进行运算或处理的核外，还可进一步包括必要的硬件加速器，如现场可编程门阵列(field programmable gate array，FPGA)、PLD(可编程逻辑器件)、或者实现专用逻辑运算的逻辑电路。
当以上模块或单元以硬件实现的时候，该硬件可以是CPU、微处理器、数字信号处理(digital signal processing，DSP)芯片、微控制单元(microcontroller unit，MCU)、人工智能处理器、ASIC、SoC、FPGA、PLD、专用数字电路、硬件加速器或非集成的分立器件中的任一个或任一组合，其可以运行必要的软件或不依赖于软件以执行以上方法流程。
可选的，本申请实施例还提供了一种通信装置(例如，该通信装置可以是芯片或芯片系统)，该通信装置包括处理器，用于实现上述任一方法实施例中的方法。在一种可能的设计中，该通信装置还包括存储器。该存储器，用于保存必要的程序指令和数据，处理器可以调用存储器中存储的程序代码以指令该通信装置执行上述任一方法实施例中的方法。当然，存储器也可以不在该通信装置中。该通信装置是芯片系统时，可以由芯片构成，也可以包含芯片和其他分立器件，本申请实施例对此不作具体限定。
在上述实施例中，可以全部或部分地通过软件、硬件、固件或者其任意组合来实现。当使用软件程序实现时，可以全部或部分地以计算机程序产品的形式来实现。该计算机程序产品包括一个或多个计算机指令。在计算机上加载和执行计算机程序指令时，全部或部分地产生按照本申请实施例所述的流程或功能。所述计算机可以是通用计算机、专用计算机、计算机网络、或者其他可编程装置。所述计算机指令可以存储在计算机可读存储介质中，或者从一个计算机可读存储介质向另一个计算机可读存储介质传输，例如，所述计算机指令可以从一个网站站点、计算机、服务器或者数据中心通过有线(例如同轴电缆、光纤、数字用户线(digital subscriber line，DSL))或无线(例如红外、无线、微波等)方式向另一个网站站点、计算机、服务器或数据中心进行传输。所述计算机可读存储介质可以是计算机能够存取的任何可用介质或者是包含一个或多个可以用介质集成的服务器、数据中心等数据存储设备。所述可用介质可以是磁性介质(例如，软盘、硬盘、磁带)，光介质(例如，DVD)、或者半导体介质(例如固态硬盘(solid state disk，SSD))等。
尽管在此结合各实施例对本申请进行了描述，然而，在实施所要求保护的本申请过程中，本领域技术人员通过查看所述附图、公开内容、以及所附权利要求书，可理解并实现所述公开实施例的其他变化。在权利要求中，“包括”(comprising)一词不排除其他组成部分或步骤，“一”或“一个”不排除多个的情况。单个处理器或其他单元可以实现权利要求中列举的若干项功能。相互不同的从属权利要求中记载了某些措施，但这并不表示这些措施不能组合起来产生良好的效果。
尽管结合具体特征及其实施例对本申请进行了描述，显而易见的，在不脱离本申请的精神和范围的情况下，可对其进行各种修改和组合。相应地，本说明书和附图仅 仅是所附权利要求所界定的本申请的示例性说明，且视为已覆盖本申请范围内的任意和所有修改、变化、组合或等同物。显然，本领域的技术人员可以对本申请进行各种改动和变型而不脱离本申请的精神和范围。这样，倘若本申请的这些修改和变型属于本申请权利要求及其等同技术的范围之内，则本申请也意图包含这些改动和变型在内。

Claims (63)

  1. 一种通信方法，其特征在于，所述方法包括：
    第一终端设备接收来自第二终端设备的第一侧行链路控制信息SCI和第一消息，所述第一SCI包括第一标识，所述第一标识用于指示所述第一消息为发现消息，所述发现消息用于指示所述第二终端设备为中继终端设备；
    所述第一终端设备根据所述第一标识确定所述第一消息为发现消息。
  2. 一种通信方法，其特征在于，所述方法包括：
    第一终端设备接收来自第二终端设备的第一消息；
    所述第一终端设备根据传输所述第一消息的第一资源确定所述第一消息为发现消息，其中，所述第一资源为专用于传输发现消息的资源，所述发现消息用于指示所述第二终端设备为中继终端设备。
  3. 根据权利要求1或2所述的方法，其特征在于，所述第一消息包括第一参数；所述方法还包括：
    所述第一终端设备根据所述第一参数，确定所述第二终端设备满足所述第一终端设备的能力需求或者所述第二终端设备不满足所述第一终端设备的能力需求。
  4. 根据权利要求3所述的方法，其特征在于，所述第一参数包括为所述第二终端设备提供服务的网络的标识；
    相应的，所述第一终端设备根据所述第一参数，确定所述第二终端设备满足所述第一终端设备的能力需求，包括：
    所述第一终端设备根据为所述第二终端设备提供服务的网络的标识，确定为所述第二终端设备提供服务的网络在所述第一终端设备的连接权限内。
  5. 根据权利要求4所述的方法，其特征在于，所述第一参数还包括所述第二终端设备的网络切片能力信息；所述确定所述第二终端设备满足所述第一终端设备的能力需求还包括：
    所述第一终端设备根据所述第二终端设备的切片能力信息，确定所述第二终端设备的切片能力满足所述第一终端设备的切片能力需求。
  6. 根据权利要求4或5所述的方法，其特征在于，所述第一参数还包括第一指示信息，所述第一指示信息指示所述第二终端设备接入的网络设备为第一类型的网络设备或第二类型的网络设备；
    所述确定所述第二终端设备满足所述第一终端设备的能力需求还包括：
    当所述第一终端设备仅支持建连接的网络设备为所述第一类型的网络设备时，所述第一终端设备根据所述第一指示信息确定所述第二终端设备接入的网络设备是否为所述第一类型的网络设备；
    或者，当所述第一终端设备仅支持建连接的网络设备为所述第二类型的网络设备时，所述第一终端设备根据所述第一指示信息确定所述第二终端设备接入的网络设备为所述第二类型的网络设备；
    或者，当所述第一终端设备同时支持建连接的网络设备为所述第一类型的网络设备和所述第二类型的网络设备时，所述第一终端设备根据所述第一指示信息确定所述第二终端设备接入的网络设备为所述第一类型的网络设备或所述第二类型的网络设备。
  7. 根据权利要求6所述的方法，其特征在于，当所述第一指示信息指示所述第二终端设备接入的网络设备为所述第一类型的网络设备时，所述第一参数还包括所述第二终端设备接入的网络设备所连接的核心网类型。
  8. 根据权利要求1-7任一项所述的方法，其特征在于，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第二消息，所述第二消息携带第二参数，所述第二参数用于确定所述第二终端设备满足所述第一终端设备的能力需求。
  9. 根据权利要求8所述的方法，其特征在于，所述第二参数包括允许所述第一终端设备接入的网络的标识列表。
  10. 根据权利要求9所述的方法，其特征在于，所述第二参数还包括第二指示信息或者所述第一终端设备的切片能力需求中的至少一个，所述第二指示信息指示所述第一终端设备支持建连接的网络设备为第一类型的网络设备和/或第二类型的网络设备。
  11. 根据权利要求8-10任一项所述的方法，其特征在于，所述第一终端设备向所述第二终端设备发送第二消息，包括：
    所述第一终端设备在第二资源上向所述第二终端设备发送所述第二消息，所述第二资源为专用于传输发现消息的资源。
  12. 根据权利要求8-10任一项所述的方法，其特征在于，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第二SCI，所述第二SCI包括第一标识，所述第一标识用于指示所述第二消息为发现消息。
  13. 根据权利要求1-12任一项所述的方法，其特征在于，所述方法还包括：
    所述第一终端设备根据预设准则从满足所述第一终端设备的能力需求的多个第二终端设备中选择目标第二终端设备。
  14. 根据权利要求13所述的方法，其特征在于，所述预设准则包括第一预设准则，所述第一预设准则用于确定优先级较高的一个或多个第二终端设备。
  15. 根据权利要求14所述的方法，其特征在于，所述第一预设准则包括以下一项或多项：
    接入第一网络设备的第二终端设备的优先级较高，所述第一网络设备为所述第一终端设备接入的网络设备；
    接入的网络设备所连接的核心网类型为目标核心网类型的第二终端设备的优先级较高；
    资源池信道繁忙程度不大于第一阈值的第二终端设备的优先级较高；
    功率测量值不小于第二阈值的第二终端设备的优先级较高；
    或者，当所述第一终端设备同时支持建连接的网络设备为第一类型的网络设备或第二类型的网络设备时，接入目标类型的网络设备的第二终端设备的优先级较高，所述目标类型为所述第一终端设备默认的网络设备类型；或者，所述目标类型为所述第一终端设备的高优先级业务对应的网络设备类型。
  16. 根据权利要求14或15所述的方法，其特征在于，所述预设准则还包括第二预设准则，所述第二预设准则用于从优先级较高的一个或多个第二终端设备中选择所述目标第二终端设备。
  17. 根据权利要求16所述的方法，其特征在于，所述第二预设准则包括：
    所述目标第二终端设备为所述优先级较高的一个或多个第二终端设备中对应的资源池信道繁忙程度最小的第二终端设备；
    或者，所述目标第二终端设备为所述优先级较高的一个或多个第二终端设备中对应的功率测量值最大的第二终端设备。
  18. 根据权利要求6或7或10或15任一项所述的方法，其特征在于，所述第一类型为长期演进LTE，所述第二类型为新空口NR；
    相应的，所述第一类型的网络设备为LTE系统演进型节点eNB，所述第二类型的网络设备为NR系统演进型节点gNB。
  19. 一种通信方法，其特征在于，所述方法包括：
    第二终端设备获取第一侧行链路控制信息SCI，所述第一SCI包括第一标识，所述第一标识用于指示第一消息为发现消息，所述发现消息用于指示所述第二终端设备为中继终端设备；
    第二终端设备向第一终端设备发送所述第一SCI和所述第一消息。
  20. 一种通信方法，其特征在于，所述方法包括：
    第二终端设备确定第一资源，所述第一资源为专用于传输发现消息的资源，所述发现消息用于指示所述第二终端设备为中继终端设备；
    所述第二终端设备在所述第一资源上向所述第一终端设备发送第一消息。
  21. 根据权利要求19或20所述的方法，其特征在于，所述第一消息中包括第一参数，所述第一参数用于确定所述第二终端设备满足所述第一终端设备的能力需求或者所述第二终端设备不满足所述第一终端设备的能力需求。
  22. 根据权利要求21所述的方法，其特征在于，所述第一参数包括为所述第二终端设备提供服务的网络的标识。
  23. 根据权利要求22所述的方法，其特征在于，所述第一参数还包括第一指示信息或者所述第二终端设备的网络切片能力信息中的至少一个，所述第一指示信息指示所述第二终端设备接入的网络设备为第一类型的网络设备或第二类型的网络设备。
  24. 根据权利要求23所述的方法，其特征在于，当所述第一指示信息指示所述第二终端设备接入的网络设备为所述第一类型的网络设备时，所述第一参数还包括所述第二终端设备接入的网络设备所连接的核心网类型。
  25. 根据权利要求19-24任一项所述的方法，其特征在于，所述方法还包括：
    所述第二终端设备接收来自所述第一终端设备的第二消息，所述第二消息携带第二参数；
    所述第二终端设备确定所述第二消息为发现消息；
    所述第二终端设备根据所述第二参数，确定所述第二终端设备满足所述第一终端设备的能力需求。
  26. 根据权利要求25所述的方法，其特征在于，所述方法还包括：
    所述第二终端设备接收来自所述第一终端设备的第二SCI，所述第二SCI包括第一标识，所述第一标识用于指示所述第二消息为发现消息；
    所述第二终端设备根据所述第一标识，确定所述第二消息为发现消息。
  27. 根据权利要求25所述的方法，其特征在于，所述方法还包括：
    所述第二终端设备根据传输所述第二消息的第二资源确定所述第二消息为发现消息，所述第二资源为专用于传输发现消息的资源。
  28. 根据权利要求25-27任一项所述的方法，其特征在于，所述第二参数包括允许所述第一终端设备接入的网络的标识列表；
    相应的，所述第二终端设备根据所述第二参数，确定所述第二终端设备满足所述第一终端设备的能力需求，包括：
    所述第二终端设备根据所述允许所述第一终端设备接入的网络的标识列表，确定为所述第二终端设备提供服务的网络在所述第一终端设备的连接权限内。
  29. 根据权利要求28所述的方法，其特征在于，所述第二参数还包括所述第一终端设备的切片能力需求；
    所述确定所述第二终端设备满足所述第一终端设备的能力需求还包括：
    所述第二终端设备根据所述第一终端设备的切片能力需求，确定所述第二终端设备的切片能力满足所述第一终端设备的切片能力需求。
  30. 根据权利要求28或29所述的方法，其特征在于，所述第二参数还包括第二指示信息，所述第二指示信息指示所述第一终端设备支持建连接的网络设备为第一类型的网络设备和/或第二类型的网络设备；
    所述确定所述第二终端设备满足所述第一终端设备的能力需求还包括：
    当所述第二指示信息指示所述第一终端设备仅支持建连接的网络设备为第一类型的网络设备时，所述第二终端设备确定所述第二终端设备接入的网络设备为所述第一类型的网络设备；
    或者，当所述第二指示信息指示所述第一终端设备仅支持建连接的网络设备为第二类型的网络设备时，所述第二终端设备确定所述第二终端设备接入的网络设备为所述第二类型的网络设备；
    或者，当所述第二指示信息指示所述第一终端设备同时支持建连接的网络设备为所述第一类型的网络设备和所述第二类型的网络设备时，所述第二终端设备确定所述第二终端设备接入的网络设备为所述第一类型的网络设备或者所述第二类型的网络设备。
  31. 一种第一终端设备，其特征在于，所述第一终端设备包括：收发模块和处理模块；
    所述收发模块，用于接收来自第二终端设备的第一侧行链路控制信息SCI和第一消息，所述第一SCI包括第一标识，所述第一标识用于指示所述第一消息为发现消息，所述发现消息用于指示所述第二终端设备为中继终端设备；
    所述处理模块，用于根据所述第一标识确定所述第一消息为发现消息。
  32. 一种第一终端设备，其特征在于，所述第一终端设备包括：收发模块和处理模块；
    所述收发模块，用于接收来自第二终端设备的第一消息；
    所述处理模块，用于根据传输所述第一消息的第一资源确定所述第一消息为发现消息，其中，所述第一资源为专用于传输发现消息的资源，所述发现消息用于指示所述第二终端设备为中继终端设备。
  33. 根据权利要求31或32所述的第一终端设备，其特征在于，所述第一消息包括第一参数；
    所述处理模块，还用于根据所述第一参数，确定所述第二终端设备满足所述第一终端设备的能力需求或者所述第二终端设备不满足所述第一终端设备的能力需求。
  34. 根据权利要求33所述的第一终端设备，其特征在于，所述第一参数包括为所述第二终端设备提供服务的网络的标识；
    相应的，所述处理模块，用于根据所述第一参数，确定所述第二终端设备满足所述第一终端设备的能力需求，包括：
    所述处理模块，用于根据为所述第二终端设备提供服务的网络的标识，确定为所述第二终端设备提供服务的网络在所述第一终端设备的连接权限内。
  35. 根据权利要求34所述的第一终端设备，其特征在于，所述第一参数还包括所述第二终端设备的网络切片能力信息；所述处理模块，用于确定所述第二终端设备满足所述第一终端设备的能力需求还包括：
    所述处理模块，还用于根据所述第二终端设备的切片能力信息，确定所述第二终端设备的切片能力满足所述第一终端设备的切片能力需求。
  36. 根据权利要求34或35所述的第一终端设备，其特征在于，所述第一参数还包括第一指示信息，所述第一指示信息指示所述第二终端设备接入的网络设备为第一类型的网络设备或第二类型的网络设备；
    所述处理模块，用于确定所述第二终端设备满足所述第一终端设备的能力需求还包括：
    所述处理模块，用于当所述第一终端设备仅支持建连接的网络设备为所述第一类型的网络设备时，根据所述第一指示信息确定所述第二终端设备接入的网络设备是否为所述第一类型的网络设备；
    或者，所述处理模块，用于当所述第一终端设备仅支持建连接的网络设备为所述第二类型的网络设备时，根据所述第一指示信息确定所述第二终端设备接入的网络设备为所述第二类型的网络设备；
    或者，所述处理模块，用于当所述第一终端设备同时支持建连接的网络设备为所述第一类型的网络设备和所述第二类型的网络设备时，根据所述第一指示信息确定所述第二终端设备接入的网络设备为所述第一类型的网络设备或所述第二类型的网络设备。
  37. 根据权利要求36所述的第一终端设备，其特征在于，当所述第一指示信息指示所述第二终端设备接入的网络设备为所述第一类型的网络设备时，所述第一参数还包括所述第二终端设备接入的网络设备所连接的核心网类型。
  38. 根据权利要求31-37任一项所述的第一终端设备，其特征在于，
    所述收发模块，还用于向所述第二终端设备发送第二消息，所述第二消息携带第二参数，所述第二参数用于确定所述第二终端设备满足所述第一终端设备的能力需求。
  39. 根据权利要求38所述的第一终端设备，其特征在于，所述第二参数包括允许所述第一终端设备接入的网络的标识列表。
  40. 根据权利要求39所述的第一终端设备，其特征在于，所述第二参数还包括第 二指示信息或者所述第一终端设备的切片能力需求中的至少一个，所述第二指示信息指示所述第一终端设备支持建连接的网络设备为第一类型的网络设备和/或第二类型的网络设备。
  41. 根据权利要求38-40任一项所述的第一终端设备，其特征在于，所述收发模块，用于向所述第二终端设备发送第二消息，包括：
    所述收发模块，用于在第二资源上向所述第二终端设备发送所述第二消息，所述第二资源为专用于传输发现消息的资源。
  42. 根据权利要求38-40任一项所述的第一终端设备，其特征在于，
    所述收发模块，还用于向所述第二终端设备发送第二SCI，所述第二SCI包括第一标识，所述第一标识用于指示所述第二消息为发现消息。
  43. 根据权利要求31-42任一项所述的第一终端设备，其特征在于，
    所述处理模块，还用于根据预设准则从满足所述第一终端设备的能力需求的多个第二终端设备中选择目标第二终端设备。
  44. 根据权利要求43所述的第一终端设备，其特征在于，所述预设准则包括第一预设准则，所述第一预设准则用于确定优先级较高的一个或多个第二终端设备。
  45. 根据权利要求44所述的第一终端设备，其特征在于，所述第一预设准则包括以下一项或多项：
    接入第一网络设备的第二终端设备的优先级较高，所述第一网络设备为所述第一终端设备接入的网络设备；
    接入的网络设备所连接的核心网类型为目标核心网类型的第二终端设备的优先级较高；
    资源池信道繁忙程度不大于第一阈值的第二终端设备的优先级较高；
    功率测量值不小于第二阈值的第二终端设备的优先级较高；
    或者，当所述第一终端设备同时支持建连接的网络设备为第一类型的网络设备或第二类型的网络设备时，接入目标类型的网络设备的第二终端设备的优先级较高，所述目标类型为所述第一终端设备默认的网络设备类型；或者，所述目标类型为所述第一终端设备的高优先级业务对应的网络设备类型。
  46. 根据权利要求44或45所述的第一终端设备，其特征在于，所述预设准则还包括第二预设准则，所述第二预设准则用于从优先级较高的一个或多个第二终端设备中选择所述目标第二终端设备。
  47. 根据权利要求46所述的第一终端设备，其特征在于，所述第二预设准则包括：
    所述目标第二终端设备为所述优先级较高的一个或多个第二终端设备中对应的资源池信道繁忙程度最小的第二终端设备；
    或者，所述目标第二终端设备为所述优先级较高的一个或多个第二终端设备中对应的功率测量值最大的第二终端设备。
  48. 根据权利要求36或37或40或45任一项所述的第一终端设备，其特征在于，所述第一类型为长期演进LTE，所述第二类型为新空口NR；
    相应的，所述第一类型的网络设备为LTE系统演进型节点eNB，所述第二类型的网络设备为NR系统演进型节点gNB。
  49. 一种第二终端设备，其特征在于，所述第二终端设备包括：处理模块和收发模块；
    所述处理模块，用于获取第一侧行链路控制信息SCI，所述第一SCI包括第一标识，所述第一标识用于指示第一消息为发现消息，所述发现消息用于指示所述第二终端设备为中继终端设备；
    所述收发模块，用于向第一终端设备发送所述第一SCI和所述第一消息。
  50. 一种第二终端设备，其特征在于，所述第二终端设备包括：处理模块和收发模块；
    所述处理模块，用于确定第一资源，所述第一资源为专用于传输发现消息的资源，所述发现消息用于指示所述第二终端设备为中继终端设备；
    所述收发模块，用于在所述第一资源上向所述第一终端设备发送第一消息。
  51. 根据权利要求49或50所述的第二终端设备，其特征在于，所述第一消息中包括第一参数，所述第一参数用于确定所述第二终端设备满足所述第一终端设备的能力需求或者所述第二终端设备不满足所述第一终端设备的能力需求。
  52. 根据权利要求51所述的第二终端设备，其特征在于，所述第一参数包括为所述第二终端设备提供服务的网络的标识。
  53. 根据权利要求52所述的第二终端设备，其特征在于，所述第一参数还包括第一指示信息或者所述第二终端设备的网络切片能力信息中的至少一个，所述第一指示信息指示所述第二终端设备接入的网络设备为第一类型的网络设备或第二类型的网络设备。
  54. 根据权利要求53所述的第二终端设备，其特征在于，当所述第一指示信息指示所述第二终端设备接入的网络设备为所述第一类型的网络设备时，所述第一参数还包括所述第二终端设备接入的网络设备所连接的核心网类型。
  55. 根据权利要求49-54任一项所述的第二终端设备，其特征在于，
    所述收发模块，还用于接收来自所述第一终端设备的第二消息，所述第二消息携带第二参数；
    所述处理模块，还用于确定所述第二消息为发现消息；
    所述处理模块，还用于根据所述第二参数，确定所述第二终端设备满足所述第一终端设备的能力需求。
  56. 根据权利要求55所述的第二终端设备，其特征在于，
    所述收发模块，用于接收来自所述第一终端设备的第二SCI，所述第二SCI包括第一标识，所述第一标识用于指示所述第二消息为发现消息；
    所述处理模块，还用于根据所述第一标识，确定所述第二消息为发现消息。
  57. 根据权利要求55所述的第二终端设备，其特征在于，
    所述处理模块，还用于根据传输所述第二消息的第二资源确定所述第二消息为发现消息，所述第二资源为专用于传输发现消息的资源。
  58. 根据权利要求55-57任一项所述的第二终端设备，其特征在于，所述第二参数包括允许所述第一终端设备接入的网络的标识列表；
    相应的，所述处理模块，用于根据所述第二参数，确定所述第二终端设备满足所 述第一终端设备的能力需求，包括：
    所述处理模块，用于根据所述允许所述第一终端设备接入的网络的标识列表，确定为所述第二终端设备提供服务的网络在所述第一终端设备的连接权限内。
  59. 根据权利要求58所述的第二终端设备，其特征在于，所述第二参数还包括所述第一终端设备的切片能力需求；
    所述处理模块用于确定所述第二终端设备满足所述第一终端设备的能力需求还包括：
    所述处理模块，用于根据所述第一终端设备的切片能力需求，确定所述第二终端设备的切片能力满足所述第一终端设备的切片能力需求。
  60. 根据权利要求58或59所述的第二终端设备，其特征在于，所述第二参数还包括第二指示信息，所述第二指示信息指示所述第一终端设备支持建连接的网络设备为第一类型的网络设备和/或第二类型的网络设备；
    所述处理模块，用于确定所述第二终端设备满足所述第一终端设备的能力需求还包括：
    所述处理模块，用于当所述第二指示信息指示所述第一终端设备仅支持建连接的网络设备为第一类型的网络设备时，确定所述第二终端设备接入的网络设备为所述第一类型的网络设备；
    或者，所述处理模块，用于当所述第二指示信息指示所述第一终端设备仅支持建连接的网络设备为第二类型的网络设备时，确定所述第二终端设备接入的网络设备为所述第二类型的网络设备；
    或者，所述处理模块，用于当所述第二指示信息指示所述第一终端设备同时支持建连接的网络设备为所述第一类型的网络设备和所述第二类型的网络设备时，确定所述第二终端设备接入的网络设备为所述第一类型的网络设备或者所述第二类型的网络设备。
  61. 一种通信装置，其特征在于，包括处理器；
    所述处理器用于与存储器耦合，并读取所述存储器中的指令之后，根据所述指令实现如权利要求1-18中任一项所述的方法或者实现如权利要求19-30中任一项所述的方法。
  62. 一种通信装置，其特征在于，包括处理器和接口电路，所述接口电路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如权利要求1-18中任一项所述的方法；或者，所述处理器通过逻辑电路或执行代码指令用于实现如权利要求19-30中任一项所述的方法。
  63. 一种计算机可读存储介质，其特征在于，所述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1-18中任一项所述的方法或者实现如权利要求19-30中任一项所述的方法。
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