WO2020228787A1 - 一种通信方法、装置及系统 - Google Patents

一种通信方法、装置及系统 Download PDF

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Publication number
WO2020228787A1
WO2020228787A1 PCT/CN2020/090331 CN2020090331W WO2020228787A1 WO 2020228787 A1 WO2020228787 A1 WO 2020228787A1 CN 2020090331 W CN2020090331 W CN 2020090331W WO 2020228787 A1 WO2020228787 A1 WO 2020228787A1
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WIPO (PCT)
Prior art keywords
terminal
network device
core network
communication
access network
Prior art date
Application number
PCT/CN2020/090331
Other languages
English (en)
French (fr)
Inventor
李濛
应江威
许胜锋
杨艳梅
Original Assignee
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 EP20805207.6A priority Critical patent/EP3955631A4/en
Publication of WO2020228787A1 publication Critical patent/WO2020228787A1/zh
Priority to US17/523,817 priority patent/US20220070967A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/30—Services specially adapted for particular environments, situations or purposes
    • H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W60/00—Affiliation to network, e.g. registration; Terminating affiliation with the network, e.g. de-registration
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/11—Allocation or use of connection identifiers
    • 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
    • H04W76/00—Connection management
    • H04W76/30—Connection release
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/22—Processing or transfer of terminal data, e.g. status or physical capabilities
    • H04W8/24—Transfer of terminal data
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W60/00—Affiliation to network, e.g. registration; Terminating affiliation with the network, e.g. de-registration
    • H04W60/04—Affiliation to network, e.g. registration; Terminating affiliation with the network, e.g. de-registration using triggered events
    • 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

  • the embodiments of the present application relate to the field of communication, and in particular to a communication method, device, and system.
  • V2X vehicle-to-everything
  • Uu interface communication that is, the base station is used as the control center, and data between the vehicle and the infrastructure or the vehicle and other vehicles is transmitted through the Uu interface of the base station
  • PC5 interface communication that is, data between vehicles are directly transmitted through the PC5 interface
  • V2X communication if the V2X terminal is under the coverage of the cellular network, the V2X terminal can communicate through the Uu interface in the area covered by the cellular network to achieve large-bandwidth and large-coverage communication, or it can communicate through the PC5 interface , In order to achieve low-latency and high-reliability direct communication between the vehicle and the surrounding environment nodes; if the V2X terminal is outside the coverage of the cellular network, the V2X device can communicate through the PC5 interface in the area without network deployment to meet the driving safety requirements .
  • the base station is required to allocate the resources of the V2X terminal to the V2X terminal according to the context of the V2X terminal, for example, PC5 interface communication in the base station scheduling mode .
  • 5G 5th generation
  • the core network device may initiate communication connections and signaling connection releases to save resources.
  • the access network device deletes the saved terminal context. Then, how the access network device retains the context of the V2X terminal becomes an urgent problem to be solved.
  • the embodiments of the present application provide a communication method, device, and system, so as to realize that the access network device retains the context of the V2X terminal, thereby ensuring that the V2X terminal realizes PC5 interface communication.
  • a communication method may include: a core network device obtains indication information, which is used to indicate whether to maintain or not release the signaling between the core network device and the V2X terminal after the V2X terminal completes registration Connection, or, the instruction information is used to instruct to maintain or not release the communication connection of the V2X terminal between the core network device and the access network device of the V2X terminal after the V2X terminal completes the registration; the core network device according to the obtained instruction information, Keep or not release the communication connection between the core network equipment of the V2X terminal and the access network equipment of the V2X terminal.
  • the core network device maintains or does not release the communication connection between the core network device and the access network device of the V2X terminal according to the instruction information.
  • the V2X terminal access network device during the registration phase
  • the saved context of the V2X terminal is retained to support the access network device to allocate PC5 interface resources for the V2X terminal according to the context of the V2X terminal, ensuring that the V2X terminal realizes PC5 interface communication.
  • the terminal initiates registration with the network, and through the registration process, a signaling connection between the core network device and the terminal (such as the N1 connection in 5G) is established, and the terminal accesses the core network device and the terminal.
  • the communication connection between network devices for example, the N2 connection in 5G
  • the connection between the terminal and the access network device for example, the RRC connection in 5G
  • the core network device sends a connection release request message to the access network device to release the signaling connection between the core network device and the terminal.
  • the access network device deletes the internally saved context of the terminal.
  • the terminal enters the idle state. It can be seen that the signaling connection between the core network equipment and the terminal is released, the communication connection between the core network equipment and the terminal’s access network equipment is released, the connection between the terminal and the access network equipment is released, and the access network equipment is released. Deleting the internally stored terminal context and entering the idle state are mutually equivalent concepts and can be replaced with each other.
  • maintaining or not releasing the signaling connection between the core network device and the terminal maintaining or not releasing the terminal's communication connection between the core network device and the terminal's access network device, maintaining or not releasing the terminal and the access network
  • the connection between devices, the access network device retains the internally saved terminal context, and the terminal remains connected are mutually equivalent concepts and can be replaced with each other.
  • the indication information described in this application is used to indicate whether to maintain or not release the signaling connection between the core network device and the V2X terminal after the V2X terminal completes registration, or the indication information is used to indicate that the V2X terminal After the registration is completed, the V2X terminal maintains or does not release the communication connection between the core network equipment and the V2X terminal’s access network equipment, the indication information can also be used to indicate whether the V2X terminal maintains or does not release the access network after the V2X terminal completes registration.
  • the connection between the device and the V2X terminal; or, the instruction information can also be used to instruct the access network device to retain the internally saved terminal context after the V2X terminal completes registration, or the instruction information can also be used to indicate the completion of the V2X terminal The V2X terminal remains connected after registration.
  • obtaining the indication information by the core network device may be specifically implemented as: the core network device receives the indication information from the V2X terminal.
  • the V2X terminal instructs the core network device to maintain or not release the connection after completing the registration of the V2X terminal through the instruction information, so that the access network device retains the context of the V2X terminal, thereby ensuring that the V2X terminal implements PC5 interface communication.
  • the V2X terminal may send the indication information to the core network device when it determines that there is a PC5 interface communication requirement that requires the access network device to allocate resources.
  • the V2X terminal may carry the indication message in the registration request message and send it.
  • the message in the existing registration process is reused to realize the sending of indication information, saving signaling resources.
  • the V2X terminal may separately send an indication message to the core network device. Avoid changes to the messages in the existing registration process, and achieve simple and high compatibility.
  • the indication information may include one or more of the following: the type of the V2X terminal, the first indication, and the indication that the V2X terminal supports PC5 Information about the capability of interface communication.
  • the first indication is used to indicate that there is uplink signaling to be processed in the V2X terminal.
  • the core network equipment maintains or does not release the connection for the V2X terminal with the type of V2X, supporting PC5 interface communication and one or more characteristics of the uplink signaling to be processed, so as to achieve access
  • the network equipment retains the context of the V2X terminal, thereby ensuring that the V2X terminal implements PC5 interface communication.
  • uplink signaling to be processed which can be equivalent to: there are other uplink non-access stratum (NAS) messages other than the first service request (service request) to be processed, the first service request Used to activate user plane resources; or, there is a second service request to be processed, and the second service request is used to deactivate user plane resources and can be replaced with each other.
  • NAS uplink non-access stratum
  • the indication information may include one or more of the following: the type of the V2X terminal, and the capability information of the V2X terminal to support PC5 interface communication.
  • acquiring the instruction information by the core network device may be implemented as: the core network device acquires the instruction information from the subscription information of the V2X terminal. The core network device obtains the instruction information from the contract information, and only needs to modify the processing logic of the core network device, and the logic of other network elements is not modified, which is simple to implement and has high compatibility.
  • the core network device may obtain the contract information of the V2X terminal from the contract information management network element according to the identifier of the V2X terminal.
  • the indication information may include: information used to indicate that the V2X terminal is communicating on the PC5 interface, or information used to indicate the ability of the access network device to support PC5 interface communication.
  • acquiring the instruction information by the core network device may be implemented as: the core network device receives the instruction information from the access network device. The core network device obtains the instruction information from the access network device, and only needs to modify the processing logic of the access network device, which reduces the impact on the V2X terminal.
  • the indication information may include a rejection message of the connection release request message.
  • the connection release request message is used to release the communication connection of the V2X terminal between the core network device and the access network device of the V2X terminal.
  • the communication method provided in this application may further include: the core network device sends a connection release request message to the access network device.
  • obtaining the indication information by the core network device may be specifically implemented as: the core network device receives a rejection message of the connection release request message from the access network device. The core network device obtains the instruction information from the access network device, and only needs to modify the processing logic of the access network device, which reduces the impact on the V2X terminal.
  • the core network device maintains or does not release the communication connection of the V2X terminal between the core network device and the access network device of the V2X terminal according to the instruction information, which can be specifically implemented as follows: the core network device according to the instruction information , Does not send a connection release request message to the access network device.
  • the core network device sending a connection release request message to the access network device may be implemented as: the core network device starts a timer, and sends a connection release request message to the access network device after the timer expires.
  • the core network device does not send a connection release request message to the access network device according to the instruction information, which can be specifically implemented as follows: the core network does not start the timer after receiving the instruction information; or the core network receives the instruction information After that, cancel the timer that has started but has not expired.
  • this application provides another communication method.
  • the method may include: when the V2X terminal uses the PC5 interface in the base station scheduling mode to communicate and transmit V2X service data, or when the V2X terminal uses the spectrum controlled by the current camping cell to transmit V2X For service data, the V2X terminal sends instruction information to the core network device.
  • the instruction information is used to indicate whether to maintain or not release the signaling connection between the core network device and the V2X terminal after the V2X terminal completes registration, or the instruction information is used After instructing the V2X terminal to maintain or not release the communication connection between the core network device and the access network device of the V2X terminal after the V2X terminal completes the registration; after that, the V2X terminal sends a resource request message to the access network device of the V2X terminal.
  • the resource request message is used to request PC5 interface communication resources from the access network device, and the PC5 interface communication resources are used to transmit V2X service data.
  • the V2X terminal when a V2X terminal has a PC5 interface communication requirement that requires access to the network device to allocate resources, the V2X terminal sends instruction information to the core network device, so that the core network device maintains or does not release the V2X terminal according to the instruction information
  • the communication connection between the core network equipment and the access network equipment of the V2X terminal is retained to support the access network equipment according to the V2X terminal’s
  • the context allocates resources of the PC5 interface to the V2X terminal, ensuring that the V2X terminal realizes the PC5 interface communication.
  • the communication method provided in the second aspect of the present application has the same content as the communication method provided in the first aspect above, except for a different description.
  • the first aspect described the solution from the perspective of core network equipment.
  • the second aspect of this application describes the solution from the perspective of a V2X terminal. Therefore, the specific implementation of the second aspect may refer to the specific implementation of the first aspect and the implementation manners in time.
  • the V2X terminal uses the PC5 interface in the base station scheduling mode to communicate and transmit V2X service data, which can be understood as: the V2X terminal determines to use the PC5 interface in the base station scheduling mode to communicate and transmit V2X service data, and the two can be replaced with each other.
  • the V2X terminal uses the spectrum controlled by the current camping cell to transmit V2X service data, which can be understood as: the V2X terminal determines to use the spectrum controlled by the current camping cell to transmit V2X service data, and the two can be replaced with each other.
  • the V2X terminal sending instruction information to the core network device may be specifically implemented as follows: the V2X terminal sends a registration request message to the core network device, and the registration request message carries the instruction information.
  • the V2X terminal instructs the core network device to maintain or not release the connection after completing the registration of the V2X terminal through the instruction information, so that the access network device retains the context of the V2X terminal, thereby ensuring that the V2X terminal implements PC5 interface communication.
  • the message in the existing registration process is reused to realize the sending of indication information, saving signaling resources.
  • the V2X terminal sending instruction information to the core network device may be specifically implemented as follows: the V2X terminal sends instruction information to the core network device. Avoid changes to the messages in the existing registration process, and achieve simple and high compatibility.
  • the indication information may include one or more of the following: the type of the V2X terminal, the first indication, and the capability information of the V2X terminal to support PC5 interface communication.
  • the first indication is used to indicate that the V2X terminal has uplink signaling to be processed.
  • the V2X terminal requests the core network equipment to maintain or not release the connection with one or more of the characteristics of the V2X type, supporting PC5 interface communication, and pending uplink signaling through the instruction information, so as to realize the access network equipment
  • the context of the V2X terminal is preserved to ensure that the V2X terminal realizes PC5 interface communication.
  • the communication method provided in the second aspect of the present application may further include: after the V2X terminal receives the registration acceptance message, it sends a message to the core network device Send a NAS message, the NAS message includes a service request message, and the service request message is used to request deactivation of user plane resources.
  • this application provides yet another communication method, which may include: the access network device receives a resource request message from a V2X terminal, the resource request message is used to request the allocation of PC5 interface communication resources for the V2X terminal; The network device sends instruction information to the core network device according to the resource request message.
  • the instruction information is used to indicate whether to maintain or not release the signaling connection between the core network device and the V2X terminal after the V2X terminal completes registration, or the instruction information is used Instructing to maintain or not release the communication connection of the V2X terminal between the core network device and the V2X terminal access network device after the V2X terminal completes the registration.
  • the access network device when the access network device receives a resource request message from the V2X terminal, the access network device determines that the V2X terminal has a PC5 interface communication requirement that requires the access network device to allocate resources, and the access network device sends the core network The device sends instruction information so that the core network device maintains or does not release the communication connection between the V2X terminal between the core network device and the access network device of the V2X terminal according to the instruction information. In this way, the access network device saves the V2X terminal during the registration phase
  • the context of the V2X terminal is retained to support the access network device to allocate resources of the PC5 interface to the V2X terminal according to the context of the V2X terminal, ensuring that the V2X terminal realizes PC5 interface communication.
  • the access network device receiving the resource request message from the V2X terminal can be understood as: the access network device obtains the information that the V2X terminal is communicating on the PC5 interface, and the two can be replaced with each other.
  • the communication method provided in the third aspect of the present application has the same content as the communication method provided in the first aspect, except for a different description.
  • the first aspect described the solution from the perspective of core network equipment.
  • the third aspect of this application describes the solution from the perspective of the access network device. Therefore, the specific implementation of the third aspect may refer to the specific implementation of the first aspect and the implementation manners in time.
  • the indication information includes: information used to indicate that the V2X terminal is communicating on the PC5 interface, or information used to indicate the ability of the access network device to support PC5 communication.
  • the specific content of the instruction information provided by the access network device is provided. The core network device obtains the instruction information from the access network device, and only needs to modify the processing logic of the access network device, reducing the impact on the V2X terminal .
  • the indication information may include a rejection message of a connection release request message, where the connection release request message is used to release the communication connection of the V2X terminal between the core network device and the access network device of the V2X terminal.
  • the method provided in the embodiment of the present application may further include: the access network device receives a connection release request message from the core network device.
  • the access network device sends instruction information to the core network device according to the resource request message, which can be specifically implemented as follows: the access network device sends a connection release request message to the core network device according to the resource request message and the connection release request message. news.
  • the specific content of the instruction information provided by the access network device is provided.
  • the core network device obtains the instruction information from the access network device, and only needs to modify the processing logic of the access network device, reducing the impact on the V2X terminal .
  • the access network device sends a rejection message of the connection release request message to the core network device according to the resource request message and the connection release request message, which can be specifically implemented as follows: the access network device receives the resource request When the message is sent, the timer is started; if the timer does not expire when the access network device receives the connection release request message, the access network device sends a rejection message of the connection release request message to the core network device.
  • the timer is configured to control the duration of maintaining or not releasing the connection for the PC5 interface communication of the V2X terminal to avoid the impact of long-term maintaining or not releasing the connection on the network performance.
  • this application provides another communication method, including: the core network device obtains capability information for instructing the V2X terminal to support PC5 interface communication; the core network device maintains or does not release the V2X after the V2X terminal completes registration according to the capability information The signaling connection between the terminal and the core network equipment.
  • the core network device maintains or does not release the signaling connection between the V2X terminal and the core network device after the V2X terminal completes registration according to the capability information indicating that the V2X terminal supports PC5 interface communication.
  • the context of the V2X terminal saved by the access network device during the V2X terminal registration phase is retained to support the access network device to allocate PC5 interface resources for the V2X terminal according to the V2X terminal context, ensuring that the V2X terminal realizes PC5 interface communication.
  • the core network device obtains capability information used to indicate that the V2X terminal supports PC5 interface communication, which can be specifically implemented as follows: the core network device can receive the capability information from the V2X terminal.
  • the V2X terminal instructs the core network device to maintain or not release the connection after the V2X terminal completes registration through the capability information, so that the access network device retains the context of the V2X terminal, thereby ensuring that the V2X terminal realizes PC5 interface communication.
  • the foregoing capability information may be carried in the registration request message.
  • the messages in the existing registration process are reused to realize the sending of the above-mentioned capability information, saving signaling resources.
  • the core network device maintains or does not release the signaling connection between the V2X terminal and the core network device after the V2X terminal completes the registration according to the foregoing capability information, including: the core network device according to the capability Information, after the V2X terminal completes registration, the connection release request message is not sent to the access network device.
  • the core network device maintains or does not release the signaling connection between the V2X terminal and the core network device after the V2X terminal completes the registration according to the above-mentioned capability information, including: the core network device subscribes to the V2X terminal Information and the above-mentioned capability information, after the V2X terminal completes the registration, the signaling connection between the V2X terminal and the core network device is maintained or not released.
  • the aforementioned core network equipment may be an access and mobility management function (AMF).
  • AMF access and mobility management function
  • the capability information in the communication method provided in the fourth aspect of this application can be used as a possible implementation of the indication information in the communication method provided in the first aspect.
  • the specific communication method provided in the fourth aspect is The implementation can refer to the specific implementation of the aforementioned first aspect.
  • the present application provides a communication device, which may be a core network device, a device or a chip system in a core network device, or a device that can be matched and used with a core network device.
  • the communication device can realize the functions performed by the core network equipment in the above-mentioned aspects or various possible designs, and the functions can be realized by hardware, or by hardware executing corresponding software.
  • the hardware or software includes one or more modules corresponding to the aforementioned functions.
  • the communication device may include: an acquisition unit and a processing unit.
  • the acquiring unit is configured to acquire indication information used to indicate whether to maintain or not release the signaling connection between the core network device and the V2X terminal after the V2X terminal completes registration, or the indication Information is used to indicate whether to maintain or not release the communication connection between the V2X terminal between the core network device and the access network device of the V2X terminal after the V2X terminal completes the registration; the processing unit is used to maintain or not Release the communication connection of the V2X terminal between the core network equipment and the access network equipment of the V2X terminal.
  • the acquiring unit is used to acquire capability information used to instruct the V2X terminal to support PC5 interface communication; the processing unit is configured to keep or not according to the capability information acquired by the acquiring unit after the V2X terminal completes registration Release the signaling connection between the V2X and the core network device.
  • the communication device provided in the fifth aspect is used to implement the communication method provided in the first aspect or the fourth aspect, and the specific implementation may refer to the specific implementation of the first aspect or the fourth aspect.
  • the present application provides a communication device, which may be a V2X terminal, a device or a chip system in a V2X terminal, or a device that can be matched and used with a V2X terminal.
  • the communication device can realize the functions performed by the V2X terminal in the above-mentioned aspects or various possible designs.
  • the functions can be realized by hardware, or by hardware executing corresponding software.
  • the hardware or software includes one or more modules corresponding to the aforementioned functions.
  • the communication device may include: a determining unit and a sending unit.
  • the determining unit is used to determine when the V2X terminal uses the PC5 interface of the base station scheduling mode to communicate and transmit V2X service data, or the V2X terminal uses the spectrum controlled by the current camping cell to transmit V2X service data; the sending unit is used when the determining unit determines When the V2X terminal uses the PC5 interface of the base station scheduling mode to communicate and transmits V2X service data, or when the V2X terminal uses the spectrum controlled by the current camping cell to transmit V2X service data, it sends indication information to the core network equipment.
  • the indication information is used to indicate the V2X terminal Keep or not release the signaling connection between the core network device and the V2X terminal after the registration is completed, or the indication information is used to indicate that the V2X terminal is maintained or not released after the V2X terminal completes the registration in the access network between the core network device and the V2X terminal Communication connection between devices; the sending unit is also used to send a resource request message to the access network device of the V2X terminal.
  • the resource request message is used to request PC5 interface communication resources from the access network device, and the PC5 interface communication resources are used for transmission V2X business data.
  • the communication device provided in the sixth aspect is used to implement the communication method provided in the second aspect, and the specific implementation may refer to the specific implementation in the second aspect.
  • the present application provides a communication device.
  • the device may be an access network device of a V2X terminal, or a device in an access network device, or a device that can be matched and used with an access network device.
  • the communication device can realize the functions performed by the access network equipment in the above-mentioned aspects or various possible designs, and the functions can be realized by hardware, or by hardware executing corresponding software.
  • the hardware or software includes one or more modules corresponding to the aforementioned functions.
  • the communication device may include: a receiving unit and a sending unit.
  • the receiving unit is used to receive a resource request message from the V2X terminal, the resource request message is used to request the allocation of PC5 interface communication resources for the V2X terminal;
  • the sending unit is used to send the core network device to the core network device according to the resource request message received by the receiving unit
  • Send instruction information the instruction information is used to indicate whether to maintain or not release the signaling connection between the core network device and the V2X terminal after the V2X terminal completes registration, or the instruction information is used to indicate whether to maintain or not release the V2X terminal after the registration is completed
  • the V2X terminal is a communication connection between the core network equipment and the access network equipment of the V2X terminal.
  • the communication device provided in the seventh aspect is used to implement the communication method provided in the third aspect, and the specific implementation may refer to the specific implementation in the third aspect.
  • an embodiment of the present application provides yet another communication device, the device including a processor, configured to implement the communication method described in the first aspect or the fourth aspect.
  • the device may further include a memory, which is coupled to the processor, and when the processor executes the instructions stored in the memory, the communication method described in the first aspect or the fourth aspect can be implemented.
  • the device may further include a communication interface, which is used for the device to communicate with other devices.
  • the communication interface may be a transceiver, a circuit, a bus, a module, or other types of communication interfaces.
  • the device includes:
  • Memory used to store instructions
  • the processor is configured to obtain instruction information, and according to the instruction information, maintain or not release the communication connection of the V2X terminal between the core network device and the access network device of the V2X terminal.
  • the indication information is used to indicate whether to maintain or not release the signaling connection between the core network equipment and the V2X terminal after the V2X terminal completes registration, or the indication information is used to indicate whether to maintain or not release the V2X terminal after the V2X terminal completes registration.
  • the processor may be used to obtain capability information indicating that the V2X terminal supports PC5 interface communication, and according to the capability information, after the V2X terminal completes registration, the signaling connection between the V2X and the core network device is maintained or not released.
  • the instructions in the memory in this application can be pre-stored or downloaded from the Internet when the device is used and then stored. This application does not specifically limit the source of the instructions in the memory.
  • the coupling in the embodiments of the present application is an indirect coupling or connection between devices, units or modules, which can be electrical, mechanical or other forms, and is used for information exchange between devices, units or modules.
  • the embodiments of the present application provide yet another communication device, which may be a V2X terminal, a device or a chip system in a V2X terminal, or a device that can be matched and used with a V2X terminal.
  • the device includes a processor for implementing the communication method described in the second aspect.
  • the device may further include a memory, the memory is coupled to the processor, and when the processor executes the instructions stored in the memory, the communication method described in the second aspect can be implemented.
  • the device may further include a communication interface, which is used for the device to communicate with other devices.
  • the communication interface may be a transceiver, a circuit, a bus, a module, or other types of communication interfaces.
  • the device includes:
  • Memory used to store instructions
  • the processor is configured to send instructions to the core network device through the communication interface when the V2X terminal uses the PC5 interface of the base station scheduling mode to communicate and transmit V2X service data, or when the V2X terminal uses the spectrum controlled by the current camping cell to transmit V2X service data
  • the indication information is used to indicate whether to maintain or not release the signaling connection between the core network device and the V2X terminal after the V2X terminal completes registration, or the indication information is used to indicate whether to maintain or not release the V2X terminal after the V2X terminal completes registration.
  • the processor may also be used to send a resource request message to the access network device of the V2X terminal through the communication interface, where the resource request message is used to request PC5 interface communication resources from the access network device, and the PC5 interface communication resources are used to transmit V2X service data .
  • the embodiments of the present application provide yet another communication device, which may be an access network device of a V2X terminal, or a device or a chip system in an access network device, or can be matched with an access network device
  • the device used.
  • the device includes a processor for implementing the communication method described in the third aspect.
  • the device may further include a memory, which is coupled with the processor, and when the processor executes the instructions stored in the memory, the communication method described in the third aspect can be implemented.
  • the device may further include a communication interface, which is used for the device to communicate with other devices.
  • the communication interface may be a transceiver, a circuit, a bus, a module, or other types of communication interfaces.
  • the device includes:
  • Memory used to store instructions
  • the processor is configured to receive a resource request message from the V2X terminal through a communication interface, the resource request message is used to request the allocation of PC5 interface communication resources for the V2X terminal; according to the received resource request message, the instruction information is sent to the core network device through the communication interface
  • the indication information is used to indicate whether to maintain or not release the signaling connection between the core network device and the V2X terminal after the V2X terminal completes registration, or the indication information is used to indicate whether to maintain or not release the V2X terminal after the V2X terminal completes registration.
  • the communication connection between the core network equipment and the access network equipment of the V2X terminal is configured to receive a resource request message from the V2X terminal through a communication interface, the resource request message is used to request the allocation of PC5 interface communication resources for the V2X terminal; according to the received resource request message, the instruction information is sent to the core network device through the communication interface
  • the indication information is used to indicate whether to maintain or not release the signaling connection between the core network device and the V2X terminal
  • an embodiment of the present application also provides a computer-readable storage medium, including instructions, which when run on a computer, cause the computer to execute the communication described in any one of the above aspects or any one of the possible implementations. method.
  • the embodiments of the present application also provide a computer program product, which when running on a computer, enables the computer to execute the communication method described in any one of the foregoing aspects or any one of the possible implementation manners.
  • an embodiment of the present application provides a chip system, which includes a processor and may also include a memory, configured to implement the functions of the core network device in the foregoing method.
  • the chip system can be composed of chips, or can include chips and other discrete devices.
  • an embodiment of the present application provides a chip system.
  • the chip system includes a processor and may also include a memory for implementing the functions of the V2X terminal in the foregoing method.
  • the chip system can be composed of chips, or can include chips and other discrete devices.
  • an embodiment of the present application provides a chip system.
  • the chip system includes a processor and may also include a memory for implementing the function of the access network device in the above method.
  • the chip system can be composed of chips, or can include chips and other discrete devices.
  • a communication system in a sixteenth aspect, includes a first communication device and a second communication device.
  • the first communication device can implement the method of the first or fourth aspect or the first or fourth aspect.
  • the second communication device may implement the method of the second aspect or any possible implementation method of the second aspect.
  • the first communication device is a core network device
  • the second communication device is a V2X terminal.
  • a communication system in a seventeenth aspect, includes a third communication device and a fourth communication device.
  • the third communication device can implement the method of the first aspect or the fourth aspect or the first or fourth aspect.
  • the fourth communication device may implement the method of the third aspect or any possible implementation method of the third aspect.
  • the third communication device is a core network device
  • the fourth communication device is an access network device.
  • a communication system includes a V2X terminal and a core network device.
  • the V2X terminal is used to transmit V2X service data to the core network device when the V2X terminal uses the PC5 interface of the base station scheduling mode to communicate and transmit V2X service data, or when the V2X terminal uses the spectrum controlled by the current resident cell to transmit V2X service data
  • Instruction information the instruction information is used to indicate whether to maintain or not release the signaling connection between the core network device and the V2X terminal after the V2X terminal completes registration, or the instruction information is used to indicate to maintain or not release the V2X terminal after the V2X terminal completes registration
  • the communication connection between the core network equipment and the access network equipment of the V2X terminal; the core network equipment is used to obtain the instruction information, and according to the instruction information, keep or not release the V2X terminal in the core network equipment and the access network equipment of the V2X terminal
  • the V2X terminal is also used to send a resource request message to the access
  • a communication system includes an access network device and a core network device.
  • the access network device is used to receive a resource request message from the V2X terminal, and the resource request message is used to request the allocation of PC5 interface communication resources for the V2X terminal; the access network device is also used to send the resource request message to the core network
  • the device sends instruction information, the instruction information is used to indicate whether to maintain or not release the signaling connection between the core network device and the V2X terminal after the V2X terminal completes registration, or the instruction information is used to indicate whether to maintain or not release the V2X terminal after the V2X terminal completes registration
  • the communication connection between the V2X terminal between the core network equipment and the access network equipment of the V2X terminal; the core network equipment is used to obtain instruction information, and according to the instruction information, maintain or not release the V2X terminal's access between the core network equipment and the V2X terminal Communication connection between network devices.
  • a communication system in a twentieth aspect, includes a V2X terminal and a core network device.
  • the V2X terminal is used to send capability information indicating that the V2X terminal supports PC5 interface communication to the core network device;
  • the core network device is used to receive the capability information, and according to the capability information, the V2X terminal maintains or does not release it after the registration is completed Signaling connection between V2X terminal and core network equipment.
  • the core network equipment in the communication system provided by the twelfth aspect is used to implement the communication method provided by the fourth aspect, and the specific implementation may refer to the specific implementation of the fourth aspect.
  • FIG. 1 is a simplified schematic diagram of a communication system architecture provided by an embodiment of this application.
  • FIG. 2 is a flowchart of a communication method provided by an embodiment of this application.
  • FIG. 3 is a schematic diagram of the composition of a communication device provided by an embodiment of the application.
  • FIG. 4 is a flowchart of a communication method provided by an embodiment of this application.
  • FIG. 5 is a flowchart of another communication method provided by an embodiment of this application.
  • FIG. 6 is a flowchart of still another communication method provided by an embodiment of this application.
  • FIG. 6a is a flowchart of yet another communication method provided by an embodiment of this application.
  • FIG. 7 is a schematic diagram of the composition of another communication device provided by an embodiment of the application.
  • FIG. 8 is a schematic diagram of the composition of still another communication device provided by an embodiment of this application.
  • FIG. 9 is a schematic diagram of the composition of still another communication device provided by an embodiment of this application.
  • FIG. 10 is a schematic diagram of the composition of still another communication device provided by an embodiment of this application.
  • FIG. 11 is a schematic diagram of the composition of still another communication device provided by an embodiment of this application.
  • FIG. 12 is a schematic diagram of the composition of still another communication device provided by an embodiment of this application.
  • FIG. 13 is a flowchart of yet another communication method provided by an embodiment of this application.
  • FIG. 14 is a flowchart of still another communication method provided by an embodiment of this application.
  • FIG. 15 is a flowchart of yet another communication method provided by an embodiment of this application.
  • FIG. 16 is a flowchart of still another communication method provided by an embodiment of this application.
  • words such as “first” and “second” are used to distinguish the same or similar items that have basically the same function and effect. Those skilled in the art can understand that words such as “first” and “second” do not limit the quantity and order of execution, and words such as “first” and “second” do not limit the difference.
  • the “first” and second descriptions of technical features have no order or size order.
  • 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. To be precise, words such as “exemplary” or “for example” are used to present related concepts in a specific manner to facilitate understanding.
  • A/B can mean A or B; "and/or” in this application is only It is an association relationship that describes the associated objects, which means that there can be three kinds of relationships, for example, A and/or B, which can mean: A alone exists, A and B exist at the same time, and B exists alone, where A, B It can be singular or plural.
  • plural means two or more than two.
  • the following at least one item (a)” or similar expressions refers to any combination of these items, including any combination of a single item (a) or plural items (a).
  • at least one item (a) 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 .
  • At least one can also be described as one or more, and the multiple can be two, three, four or more, which is not limited in this application.
  • the method provided in the embodiments of this application can be used in any communication system that supports V2X service data transmission.
  • the communication system can be a 3rd generation partnership project (3GPP) communication system, for example, long term evolution (long term evolution).
  • 3GPP 3rd generation partnership project
  • LTE long term evolution
  • the LTE) system may also be a fifth generation (5th generation, 5G) mobile communication system or a new radio (NR) system, or a non-3GPP communication system, without limitation.
  • the communication system may include a terminal, an access network device, a core network device, a data network (DN), and the like.
  • the core network equipment can include access and AMF, policy control function (PCF), unified data management (UDM), session management function (session management function, SMF), user plane function (user plane function, UPF).
  • PCF policy control function
  • UDM unified data management
  • SMF session management function
  • UPF user plane function
  • the terminal may be referred to as user equipment (UE) or terminal equipment (terminal).
  • the terminal can support V2X communication, such as receiving or sending V2X messages.
  • the terminal can also be called a V2X terminal.
  • V2X messages may include, but are not limited to, vehicle-to-vehicle (V2V) messages, vehicle-to-person (V2P) messages, vehicle-to-network (V2N) messages, vehicle and road infrastructure (vehicle to infrastructure, V2I) information, anti-collision messages between cars, entertainment application messages, navigation messages for interaction between cars, etc.
  • the terminal shown in FIG. 1 may include, but is not limited to, a vehicle-mounted terminal, a mobile phone, a tablet computer or a computer with a wireless transceiver function, a smart gas station, a smart signal lamp, and so on.
  • the terminal may transmit V2X messages through different types of communication interfaces.
  • the communication interface may include a PC5 port and/or a Uu port.
  • Access network equipment is responsible for radio resource management, uplink and downlink data classification and QoS applications, as well as complete signaling processing with control plane network elements, and complete data forwarding with user plane network elements.
  • the access network device may be a base station, a broadband network service gateway (BNG), an aggregation switch, a non-3GPP access device, etc.
  • the base station may include various forms of base stations, for example: a macro base station, a micro base station (also referred to as a small station), a relay station, an access point, etc., which are not specifically limited in the embodiment of the present application.
  • the equipment that the terminal accesses to the core network is collectively referred to as the access network equipment in the text, and will not be described again.
  • the access network equipment can be the evolved universal terrestrial radio access network (E-UTRAN) equipment in the 4G network, and the next generation radio access network in the 5G network. , NG-RAN) equipment, etc.
  • E-UTRAN evolved universal terrestrial radio access network
  • AMF its main functions include the termination point of the wireless access network control plane, the termination point of non-access signaling, mobility management, lawful monitoring, access authorization ⁇ authentication, etc.
  • SMF is used for session management, terminal Internet Protocol (IP) address allocation and management, selection of end points that can manage user plane functions, policy control and charging function interfaces, downlink data notifications, etc.
  • IP Internet Protocol
  • UPF is used for packet routing and forwarding, quality of service (QoS) processing of user plane data, etc.
  • DN is a network used to transmit data, such as an Internet network.
  • PCF is used to provide UE Policy, Access and Mobility (AM) Policy, and Session Management (SM) Policy related parameters to the terminal, AMF, or SMF, respectively.
  • AMF Access and Mobility
  • SM Session Management
  • the PCF provides V2X-related authentication and policy parameters to the terminal and access network equipment.
  • UDM is used to manage contract information and provide contract information to related network elements.
  • a network composed of operator network elements other than RAN can become a core network.
  • a 4G network it includes MME, S-GW, P-GW, HSS and other network elements.
  • a 5G network it Including AMF, SMF, UPF, UDM, PCF and other network elements.
  • the Uu interface in Figure 1 is the wireless connection interface between the terminal and the access network device.
  • the N2 interface is the reference point between the access network equipment and the core network equipment (AMF). It is used to send NAS messages. It may also include information related to the transmission of the access network configuration. Therefore, the connection between the access network equipment and the core network equipment
  • the communication connection can be called N2 connection.
  • the PC5 interface is the reference point for the user plane ProSe direct communication of the V2X service between terminals.
  • the network architecture applied in the embodiment of the present application is not limited to the network architecture shown in FIG. 1.
  • the network architecture shown in FIG. 1 is only an exemplary architecture diagram, and the number of network elements and the names of the network elements included in the communication system are not limited.
  • the network shown in FIG. 1 may also include other functional entities.
  • the network element, the interface name between each network element, and the naming of each protocol layer in the above-mentioned Figure 1 architecture are just an example, the specific implementation of the network element, the interface name between the network elements, and the protocol layer can be other names The embodiments of this application do not specifically limit this.
  • the solutions provided by the embodiments of the present application can be applied to the process of terminal registration to the network in the wireless communication system and the interaction process of each network element after the registration is completed.
  • the terminal to the network in the wireless communication system The registration process and the interaction process of each network element after registration are briefly described.
  • the terminal may send a registration request to the network in various scenarios such as initial access to the network, or regular registration, or registration caused by mobility, which is not specifically limited in the embodiment of the present application.
  • a registration request to the network in various scenarios such as initial access to the network, or regular registration, or registration caused by mobility, which is not specifically limited in the embodiment of the present application.
  • S201 The terminal sends a registration request message to the AMF.
  • the registration request message is a NAS message, and the registration request message carries the identification of the terminal.
  • the identification of the terminal is used to uniquely indicate the terminal, and the content of the identification information is not specifically limited in this application.
  • the registration request message may also include capability information of the terminal, and the capability information is used to indicate the capability of the terminal.
  • the registration request message is sent to the AMF through the RAN.
  • the AMF obtains the subscription information of the terminal from the UDM according to the identification of the terminal.
  • the core network device obtains the contract information of the terminal from the UDM according to the identification of the terminal, which can be specifically implemented as follows: the core network device obtains the contract information of the terminal from the UDM according to the identification of the terminal and other information of the terminal.
  • the other information may be capability information of the terminal or others, which is not specifically limited in the embodiment of the present application.
  • the AMF selects the PCF, and establishes an AMF-PCF association relationship.
  • the core network device may select the corresponding PCF according to the subscription information of the terminal.
  • the core network device may also send the terminal's policy request information to the PCF for the PCF to update the terminal's policy.
  • the core network device may carry a policy (policy) that the terminal has learned in a policy container (policy container) of the terminal and send it to the PCF.
  • policy policy
  • the specific implementation of S203 can refer to the standards 3GPP TS 23.502 and 3GPP TS 23.503, which will not be repeated in this embodiment of the application.
  • the core network device sends a registration acceptance message (registration accept message) to the terminal.
  • the registration acceptance request is a NAS message.
  • the registration acceptance message sent by the core network device will be sent to the receiver through a terminal context setup request (UE context setup request) carried on the next generation application protocol (NGAP) interface.
  • UE context setup request terminal context setup request
  • NGAP next generation application protocol
  • the access network device sends a registration acceptance request to the terminal through an RRC connection reconfiguration (RRC connection reconfiguration) message.
  • RRC connection reconfiguration RRC connection reconfiguration
  • the terminal has completed registration, established the N2 connection between the AMF and the RAN, the RRC connection between the RAN and the terminal, and the N1 connection between the AMF and the terminal.
  • the context of the terminal is saved in the RAN, and the terminal enters the connected state.
  • the interaction process of each network element includes:
  • the AMF judges whether the terminal has data or signaling transmission requirements.
  • the AMF determines that the terminal has a data or signaling transmission demand, it will maintain the N2 connection between the AMF and the RAN and the N1 connection between the RAN and the terminal, and perform the subsequent communication process. If the AMF determines that the terminal has no data or signaling transmission requirements, S206 is executed.
  • how the AMF determines whether the terminal has data or signaling transmission requirements can be configured according to actual requirements, which is not specifically limited in this embodiment of the application.
  • the registration request of the terminal will carry an indication that the NAS message needs to be sent again (for example, follow-on request).
  • the AMF can determine that the terminal has signaling transmission demand.
  • the NAS message sent by the terminal after registration may include a NAS message used to establish a PDU session or activate a PDU session.
  • the terminal initiates the registration request in S201 in the idle state, and the registration request includes the activation session
  • the information element PDU session to-be-activated IE
  • the AMF can determine the terminal data transmission requirements.
  • the AMF starts a timer for releasing the N2 connection.
  • the timer used to release the N2 connection may be a T3540 timer, and the duration of the T3540 timer may be 10 seconds. After the T3540 timer expires, S206 is executed.
  • the AMF sends an NGAP message for releasing the N2 connection to the RAN.
  • the RAN receives an NGAP message for releasing the N2 connection.
  • the RAN starts a timer for releasing the N2 connection.
  • the timer used to release the N2 connection may be an inactivity timer. If the RAN receives the data transmission demand of the terminal during the operation of the Inactivity timer, it refuses to release the N2 connection; if the RAN does not receive the data transmission demand of the terminal after the inactivity timer expires, then execute S209 to release the N2 connection .
  • the specific process of releasing the N2 connection may include: the RAN deletes the saved context of the terminal, the RAN sends a message for releasing the N1 connection to the terminal, and the RAN responds to the AMF's NGAP message for releasing the N2 connection.
  • the N2 connection between the AMF and the RAN and the RRC connection between the RAN and the terminal are released, the context of the terminal is deleted in the RAN, and the terminal enters an idle state.
  • FIG. 3 is a schematic diagram of the composition of a communication device 30 provided by an embodiment of the application.
  • the communication device 30 may include at least one processor 31, a memory 32, a communication interface 33, and a communication bus 34.
  • the components of the communication device 30 are specifically introduced below in conjunction with FIG. 3:
  • the processor 31 may be one processor, or a collective term for multiple processing elements.
  • the processor 31 is a central processing unit (CPU), may also be an application specific integrated circuit (ASIC), or is configured to implement one or more integrated circuits of the embodiments of the present application
  • CPU central processing unit
  • ASIC application specific integrated circuit
  • microprocessors digital signal processors, DSP
  • FPGA field programmable gate arrays
  • the processor 31 can execute various functions of the function alias control server by running or executing a software program stored in the memory 32 and calling data stored in the memory 32.
  • the processor 31 may include one or more CPUs, such as CPU0 and CPU1 shown in FIG. 3.
  • the communication device 30 may include multiple processors, such as the processor 31 and the processor 35 shown in FIG. 3.
  • processors can be a single-core processor (single-CPU) or a multi-core processor (multi-CPU).
  • the processor here may refer to one or more devices, circuits, and/or processing cores for processing data (for example, computer program instructions).
  • the memory 32 may be a read-only memory (ROM) or other types of static storage devices that can store static information and instructions, random access memory (RAM), or other types that can store information and instructions
  • the dynamic storage device can also be electrically erasable programmable read-only memory (EEPROM), compact disc read-only memory (CD-ROM) or other optical disk storage, optical disc storage (Including compact discs, laser discs, optical discs, digital versatile discs, Blu-ray discs, etc.), magnetic disk storage media or other magnetic storage devices, or can be used to carry or store desired program codes in the form of instructions or data structures and can be used by a computer Any other media accessed, but not limited to this.
  • the memory 32 may exist independently and is connected to the processor 31 through a communication bus 34.
  • the memory 32 may also be integrated with the processor 31. Among them, the memory 32 is used to store a software program for executing the solution of the present application, and the processor 31 controls the execution.
  • the communication interface 33 uses any device such as a transceiver to communicate with other devices or communication networks, such as Ethernet, radio access network (RAN), wireless local area networks (WLAN), etc. .
  • the communication interface 33 may include a receiving unit and a sending unit.
  • the communication bus 34 may be an industry standard architecture (ISA) bus, a peripheral component (PCI) bus, or an extended industry standard architecture (EISA) bus, etc.
  • ISA industry standard architecture
  • PCI peripheral component
  • EISA extended industry standard architecture
  • the bus can be divided into address bus, data bus, control bus, etc.
  • only one thick line is used in FIG. 3 to represent, but it does not mean that there is only one bus or one type of bus.
  • the components shown in FIG. 3 do not constitute a limitation on the communication device.
  • the communication device may include more or less components than shown in the figure, or a combination of certain components. Some components, or different component arrangements.
  • the processor 31 executes the following functions by running or executing software programs and/or modules stored in the memory 32, and calling data stored in the memory 32:
  • the instruction information is used to indicate whether to maintain or not release the signaling connection between the core network device and the V2X terminal after the V2X terminal completes registration, or the instruction information is used to indicate that the V2X terminal maintains or Do not release the V2X terminal's communication connection between the core network device and the V2X terminal's access network device; according to the obtained instruction information, keep or not release the V2X terminal's communication connection between the core network device and the V2X terminal's access network device Communication connection.
  • the processor 31 executes the following functions by running or executing software programs and/or modules stored in the memory 32, and calling data stored in the memory 32:
  • the V2X terminal to which the communication device 30 belongs uses the PC5 interface in the base station scheduling mode to communicate and transmits V2X service data, or when the V2X terminal to which the communication device 30 belongs uses the spectrum controlled by the current resident cell to transmit V2X service data, it transmits the V2X service data to the core network equipment
  • Send instruction information the instruction information is used to indicate whether to maintain or not release the signaling connection between the core network equipment and the V2X terminal after the V2X terminal completes registration, or the instruction information is used to indicate whether to maintain or not after the V2X terminal completes the registration
  • the communication connection of the V2X terminal between the core network device and the access network device of the V2X terminal send a resource request message to the access network device, the resource request message is used to request the access network device for PC5 interface communication resources, the PC5 interface Communication resources are used to transmit V2X service data.
  • the processor 31 executes the following functions by running or executing software programs and/or modules stored in the memory 32, and calling data stored in the memory 32:
  • the resource request message is used to request the allocation of PC5 interface communication resources for the V2X terminal; according to the resource request message, send instruction information to the core network device, the instruction information is used to indicate the completion of registration at the V2X terminal After that, the signaling connection between the core network device and the V2X terminal is maintained or not released, or the indication information is used to indicate whether to maintain or not release the access of the V2X terminal between the core network device and the V2X terminal after the V2X terminal completes registration Communication connection between network devices.
  • Fig. 4 is a flowchart of a communication method provided by an embodiment of the application. As shown in Fig. 4, the method may include:
  • V2X terminal uses the PC5 interface in the base station scheduling mode to communicate and transmits V2X service data, or when the V2X terminal uses the spectrum controlled by the current camping cell to transmit V2X service data, the V2X terminal sends indication information to the core network device.
  • the PC5 interface of the base station scheduling mode is used to communicate and transmit V2X service data, or the frequency spectrum controlled by the current resident cell is used to transmit V2X service data, which can be called mode 1 (mode1) PC5 interface communication, and its essence can refer to
  • the access network device allocates resources for transmitting V2X service data.
  • the resource can be used for direct communication between the sending end and the receiving end, and the access network device does not need to forward the V2X service data.
  • S401 can also be replaced with: when the V2X terminal is in a scenario where the service data does not need to be transmitted in the access network device but the access network device needs to allocate resources for transmitting the V2X service data, the V2X terminal sends the V2X service data to the core network.
  • the device sends instructions.
  • the V2X terminal may generate application layer data according to the user's operation in the V2X application, and the application layer data may be V2X service data.
  • the V2X terminal uses the frequency spectrum controlled by the current resident cell to transmit V2X service data.
  • V2X service data can be configured according to actual requirements, which is not specifically limited in the embodiment of the present application.
  • the indication information may be used to indicate whether to maintain or not release the signaling connection between the core network device and the V2X terminal after the V2X terminal completes registration.
  • the indication information may be used to indicate whether to maintain or not release the communication connection of the V2X terminal between the core network device and the access network device of the V2X terminal after the V2X terminal completes registration, and the communication connection may be an N2 connection.
  • the terminal initiates registration with the network, and through the registration process, a signaling connection between the core network device and the terminal (for example, the N1 connection in 5G) is established, and the terminal is connected between the core network device and the terminal.
  • the communication connection between the access network equipment (for example, the N2 connection in 5G) and the connection between the terminal and the access network equipment (for example, the RRC connection in 5G), and make the terminal enter the connected state.
  • the core network device After the terminal is registered, if the core network device determines that the terminal has no data or signaling transmission requirements, the core network device sends a connection release request message to the access network device to release the signaling connection between the core network device and the terminal , Release the terminal's communication connection between the core network device and the terminal's access network device, and release the connection between the terminal and the access network device, and the access network device deletes the internally saved terminal context. At this time The terminal has entered an idle state.
  • the signaling connection between the core network device and the terminal is released, the communication connection between the core network device and the terminal's access network device is released, the connection between the terminal and the access network device is released, and the access network device is released.
  • the device deletes the internally saved terminal context and the terminal enters the idle state, which are equivalent concepts and can be replaced with each other.
  • maintaining or not releasing the signaling connection between the core network device and the terminal maintaining or not releasing the terminal's communication connection between the core network device and the terminal's access network device, maintaining or not releasing the terminal and the access network
  • the connection between devices, the access network device retains the internally saved terminal context, and the terminal remains connected are mutually equivalent concepts and can be replaced with each other.
  • the indication information described in this application is used to indicate whether to maintain or not release the signaling connection between the core network device and the V2X terminal after the V2X terminal completes registration, or the indication information is used to indicate that the V2X terminal After the registration is completed, the V2X terminal maintains or does not release the communication connection between the core network equipment and the V2X terminal’s access network equipment, the indication information can also be used to indicate whether the V2X terminal maintains or does not release the access network after the V2X terminal completes registration.
  • the connection between the device and the V2X terminal; or, the instruction information can also be used to instruct the access network device to retain the internally saved terminal context after the V2X terminal completes registration, or the instruction information can also be used to indicate the completion of the V2X terminal The V2X terminal remains connected after registration.
  • the embodiment of the present application provides the following two possible implementation modes of the indication information:
  • the indication information can be an implicit indication.
  • the indication information may include one or more of the following: the type of the V2X terminal, the first indication, and the capability information used to indicate that the V2X terminal supports PC5 interface communication.
  • the first indication is used to indicate that there is uplink signaling to be processed in the V2X terminal.
  • There is uplink signaling to be processed which can be replaced by: there are other uplink non-access stratum (NAS) messages other than the first service request (service request) to be processed, and the first service request is used for activation User plane resources; or, there is a second service request to be processed, and the second service request is used to deactivate the user plane resources.
  • NAS uplink non-access stratum
  • the first indication may be a follow-on request identifier.
  • the instruction information is an explicit instruction.
  • the indication information may be a request to maintain or not release the signaling connection between the core network device and the terminal, or a request to maintain or not release the communication connection between the core network device and the terminal's access network device, or a request Keep or not release the connection between the terminal and the access network device, or request the access network device to retain the internally saved context of the terminal, or request the terminal to maintain an explicit cell in the connected state.
  • the V2X terminal sends instruction information to the core network device, which can be implemented in but not limited to the following two ways:
  • the V2X terminal sends a registration request message to the core network device, and the registration request message carries indication information.
  • the registration request message carries indication information on the basis of the registration request message in S201.
  • Implementation method B The V2X terminal sends independent instruction information to the core network device.
  • the execution timing of S401 can be selected according to actual requirements, and the embodiment of the present application does not specifically limit it.
  • S401 may be executed during the registration of the V2X terminal, or may also be executed after the registration of the V2X terminal is completed.
  • instruction information sent by the V2X terminal to the core network device in S401 is sent to the core network device through the access network device.
  • the processing logic of the access network device in this process is not described in this application.
  • the core network device obtains the instruction information.
  • the indication information obtained by the core network device in S402 may include one or more of the following: the type of the V2X terminal, the first indication, and the capability information used to indicate that the V2X terminal supports PC5 interface communication.
  • the indication information obtained by the core network device in S402 may include one or more of the following: the type of the V2X terminal, the display indication in mode 2 in S401, and the capability information used to indicate that the V2X terminal supports PC5 interface communication.
  • the instruction information acquired by the core network device in S402 is the instruction information sent by the V2X terminal in S401.
  • the core network device in S402 can directly receive the instruction information from the V2X.
  • the core network device in S402 receiving the indication information from the V2X terminal may be specifically implemented as: the core network device receives a registration request message from the V2X terminal, and the registration request message carries the indication information; Or, the core network device receives independent indication information sent from the V2X terminal.
  • the type of the V2X terminal in the indication information acquired by the core network device in S402 and the capability information used to indicate that the V2X terminal supports PC5 interface communication are content in the subscription information of the V2X terminal.
  • the core network device in S402 can obtain the instruction information specifically as follows: the core network device receives the instruction information from the V2X terminal, and requests the subscription information of the V2X terminal from the subscription information management network element to obtain the V2X in the instruction information.
  • the core network device maintains or does not release the communication connection of the V2X terminal between the core network device and the access network device of the V2X terminal according to the instruction information.
  • the core network device in S403 maintains or does not release the communication connection between the V2X terminal between the core network device and the access network device of the V2X terminal according to the instruction information, which can be specifically implemented as follows: the core network device according to the instruction Information, after the V2X terminal completes registration (that is, after sending a registration acceptance message to the V2X terminal), the connection release request message is not sent to the access network device.
  • the instruction information which can be specifically implemented as follows: the core network device according to the instruction Information, after the V2X terminal completes registration (that is, after sending a registration acceptance message to the V2X terminal), the connection release request message is not sent to the access network device.
  • connection release request message is used to release the communication connection of the V2X terminal between the core network device and the access network device of the V2X terminal.
  • the connection release request message may be an N2 connection release request in the 5G system.
  • step S403 can be replaced with: the core network device does not send a connection release request message to the access network device according to the instruction information. Specifically, the core network device does not send a connection release request message to the access network device after the V2X terminal completes registration (that is, after sending a registration acceptance message to the V2X terminal) according to the instruction information.
  • the core network device in S403 maintains or does not release the communication connection of the V2X terminal between the core network device and the access network device of the V2X terminal according to the instruction information, which can be specifically implemented as follows: Indication information, after the V2X terminal completes registration (that is, after sending a registration acceptance message to the V2X terminal), the timer for sending a connection release request message to the access network device is not started.
  • step S403 can be replaced with: the core network device does not start the timer for sending the connection release request message to the access network device according to the instruction information. Specifically, the core network device does not start the timer for sending the connection release request message to the access network device after the V2X terminal completes registration (that is, after sending the registration acceptance message to the V2X terminal) according to the instruction information.
  • the V2X terminal sends a resource request message to the access network device of the V2X terminal.
  • the resource request message is used to request PC5 interface communication resources from the access network device, and the PC5 interface communication resources are used to transmit V2X service data.
  • the access network device receives the resource request message from the V2X terminal.
  • the access network device allocates resources for the V2X terminal according to the resource request message and the context of the V2X terminal.
  • the core network device maintains or does not release the communication connection between the core network device and the access network device of the V2X terminal according to the instruction information provided by the V2X terminal.
  • the V2X terminal registers The context of the V2X terminal saved by the access network equipment in the phase is retained to support the access network equipment to allocate PC5 interface resources for the V2X terminal according to the context of the V2X terminal, ensuring that the V2X terminal realizes PC5 interface communication.
  • the communication method provided in this embodiment of the application may further include S407 after S402 and before S403 to complete the registration process of the V2X terminal .
  • the core network device sends a registration acceptance message to the V2X terminal.
  • S407 can refer to the specific implementation of S204, which will not be repeated here.
  • S407 is specifically implemented as S407a to S407c.
  • the core network device sends an NGAP message to the access network device.
  • the NGAP message includes a registration acceptance message and a second instruction.
  • the second indication is used to instruct the access network device to maintain or not release the communication connection of the V2X terminal between the core network device and the access network device of the V2X terminal.
  • the access network device sets the first duration according to the second instruction.
  • the first duration is the duration of detecting that the V2X terminal has no data transmission after receiving the second instruction to release the communication connection between the V2X terminal's core network device and the V2X terminal's access network device, and the first duration is less than the second duration.
  • the second duration is the duration set in the access network device for detecting that the V2X terminal has no data transmission and releasing the communication connection between the core network device and the access network device of the V2X terminal.
  • the second duration is the duration of the Inactivity timer.
  • the access network device actively initiates the release of the communication connection between the V2X terminal and the access network device of the V2X terminal.
  • the access network device sends an RRC message to the V2X terminal, where the RRC message carries a registration acceptance message.
  • the communication method provided in this embodiment of the present application may further include S408 and S409.
  • the V2X terminal After receiving the registration acceptance message, the V2X terminal sends a NAS message to the core network device.
  • the NAS message sent by the V2X terminal in S408 includes a service request message, and the service request message is used to request that the user plane resource is not activated.
  • a service request for not activating user plane resources is used to keep the V2X terminal in a connected state, or to maintain the N2 connection, or not to release the N2 connection.
  • the PDU session to be activated cell is not carried, that is, the UE will not further activate the user plane resource.
  • S409 The core network device receives the NAS message.
  • the core network device executes the Service Request process in the standard 3GPP TS 23.502, the process is the same as the process when the V2X terminal transitions from the idle state to the connected state, and will not be repeated here.
  • FIG. 5 is a flowchart of a communication method provided by an embodiment of this application. As shown in FIG. 5, the method may include:
  • the V2X terminal sends a resource request message to the access network device of the V2X terminal.
  • the resource request message is used to request PC5 interface communication resources from the access network device, and the PC5 interface communication resources are used to transmit V2X service data.
  • the access network device receives a resource request message from the V2X terminal.
  • the access network device receives the resource request information from the V2X terminal in S502, it indicates that the V2X terminal is in the mode 1 PC5 interface communication.
  • S503 The access network device sends instruction information to the core network device according to the resource request message.
  • the indication information can be used to indicate whether to maintain or not release the signaling connection between the core network device and the V2X terminal after the V2X terminal completes registration, or the indication information is used to indicate whether to maintain or not release the V2X terminal after the V2X terminal completes registration.
  • the indication information described in this application is used to indicate whether to maintain or not release the signaling connection between the core network device and the V2X terminal after the V2X terminal completes registration, or the indication information is used to indicate
  • the indication information can also be used to indicate whether to keep or not release the V2X terminal after the registration is completed
  • the instruction information is an explicit instruction.
  • the indication information may be a request to maintain or not release the signaling connection between the core network device and the terminal, or a request to maintain or not release the communication connection between the core network device and the terminal's access network device, or a request Keep or not release the connection between the terminal and the access network device, or request the access network device to retain the internally saved context of the terminal, or request the terminal to maintain an explicit cell in the connected state.
  • the indication information can be an implicit indication.
  • the indication information may include: information used to indicate that the V2X terminal is communicating on the PC5 interface, or information used to indicate the ability of the access network device to support PC5 communication.
  • the indication information may include a rejection message of the connection release request message.
  • the connection release request message is used to release the communication connection of the V2X terminal between the core network device and the access network device.
  • connection release request message may be an N2 connection release message in the 5G system.
  • the communication method provided in the embodiment of the present application may further include S503a and S503b before S503.
  • the core network device sends a connection release request message to the access network device.
  • S503a can refer to S206 and S207, which will not be repeated here.
  • the access network device receives a connection release request message from the core network device.
  • S503 may be specifically implemented as: the access network device sends a rejection message of the connection release request message to the core network device according to the resource request message and the connection release request message.
  • the access network device sends a rejection message to the core network device according to the resource request message and the connection release request message, which can be implemented as follows: the access network device starts a timer when it receives the resource request message; if When the access network device receives the connection release request message and the timer does not expire, the access network device sends a rejection message of the connection release request message to the core network device.
  • the core network device obtains the instruction information.
  • the core network device acquiring the instruction information may be implemented as: the core network device receives the instruction information from the access network device.
  • the core network device maintains or does not release the communication connection of the V2X terminal between the core network device and the access network device of the V2X terminal according to the instruction information.
  • S506 The access network device allocates resources for the V2X terminal according to the context of the V2X terminal.
  • the access network device when the access network device receives a resource request message from the V2X terminal, the access network device determines that the V2X terminal has a PC5 interface communication requirement that requires the access network device to allocate resources, and the access network device sends the core network The device sends instruction information so that the core network device maintains or does not release the communication connection between the V2X terminal between the core network device and the access network device of the V2X terminal according to the instruction information. In this way, the access network device saves the V2X terminal during the registration phase
  • the context of the V2X terminal is retained to support the access network device to allocate resources of the PC5 interface to the V2X terminal according to the context of the V2X terminal, ensuring that the V2X terminal realizes PC5 interface communication.
  • FIG. 6 is a flowchart of a communication method provided by an embodiment of the present application. As shown in FIG. 6, the method may include:
  • the core network device obtains instruction information.
  • the indication information can be used to indicate whether to maintain or not release the signaling connection between the core network device and the V2X terminal after the V2X terminal completes registration, or the indication information is used to indicate whether to maintain or not release the V2X terminal after the V2X terminal completes registration.
  • the indication information includes one or more of the following: the type of the V2X terminal, and the capability information of the V2X terminal to support PC5 interface communication.
  • S601 may be specifically implemented as: the core network device obtains the indication information from the subscription information of the V2X terminal.
  • the indication information may include: capability information used to indicate that the access network device supports PC5 communication.
  • S601 may be specifically implemented as: when the core network device performs device-level interaction with the access network device, it receives indication information from the access network device.
  • the indication information includes one or more of the following: the type of the V2X terminal, the capability information of the V2X terminal to support PC5 interface communication, and the capability information used to indicate that the access network device supports PC5 communication.
  • the core network device maintains or does not release the communication connection of the V2X terminal between the core network device and the access network device of the V2X terminal according to the instruction information.
  • the core network device maintains or does not release the communication connection between the core network device and the access network device of the V2X terminal according to the instruction information.
  • the V2X terminal access network device during the registration phase
  • the saved context of the V2X terminal is retained to support the access network device to allocate PC5 interface resources for the V2X terminal according to the context of the V2X terminal, ensuring that the V2X terminal realizes PC5 interface communication.
  • Fig. 6a is a flowchart of a communication method provided by an embodiment of the present application. As shown in Fig. 6a, the method may include:
  • the core network device obtains capability information used to indicate that the V2X terminal supports PC5 interface communication.
  • the core network device may be AMF.
  • the core network device in S701 may receive the capability information from the V2X terminal.
  • the capability information may be an implementation form of the indication information in the foregoing embodiment, and the V2X terminal may refer to the description of S401 to send the capability information, which is not repeated here.
  • the capability information can be carried in the registration request message.
  • the registration request message carries the foregoing capability information on the basis of the registration request message in S201.
  • the core network device maintains or does not release the signaling connection between the V2X terminal and the core network device after the V2X terminal completes registration according to the capability information.
  • the core network device in S702 maintains or does not release the signaling connection between the V2X terminal and the core network device after the V2X terminal completes registration according to the capability information, which can be specifically implemented as follows: Information, after the V2X terminal completes registration, the connection release request message is not sent to the access network device.
  • connection release request message is used to release the signaling connection between the V2X terminal and the core network device.
  • the connection release request message may be an N2 connection release request in the 5G system.
  • the core network device in S702 maintains or does not release the signaling connection between the V2X terminal and the core network device after the V2X terminal completes the registration according to the capability information, which can be specifically implemented as follows: The V2X terminal's subscription information and the capability information maintain or not release the signaling connection between the V2X terminal and the core network device after the V2X terminal completes registration.
  • the core network equipment can obtain V2X terminal contract information from UDM.
  • the subscription information may include service information or authorization information subscribed by the V2X terminal, or others.
  • the core network device in S702 can obtain the V2X terminal contract information from UDM, and according to the V2X terminal contract information and the capability information, it is determined that the V2X terminal is authorized to perform V2X communication on the PC5 interface, and the core network device completes registration on the V2X terminal Then keep or not release the signaling connection between the V2X terminal and the core network equipment.
  • the core network device maintains or does not release the signaling connection between the V2X terminal and the core network device after the V2X terminal completes registration according to the capability information indicating that the V2X terminal supports PC5 interface communication.
  • the context of the V2X terminal saved by the access network device during the V2X terminal registration phase is retained to support the access network device to allocate PC5 interface resources for the V2X terminal according to the V2X terminal context, ensuring that the V2X terminal realizes PC5 interface communication.
  • the core network device, the access network device, and the V2X terminal may include a hardware structure and/or software module, and a hardware structure, a software module, or a hardware structure plus a software module Form to achieve the above functions. Whether one of the above-mentioned functions is executed in a hardware structure, a software module, or a hardware structure plus a software module depends on the specific application and design constraint conditions of the technical solution.
  • the division of modules in the embodiments of the present application is illustrative, and is only a logical function division. In actual implementation, there may be other division methods.
  • the functional modules in the various embodiments of the present application may be integrated into one process. In the device, it can also exist alone physically, or two or more modules can be integrated into one module.
  • the above-mentioned integrated modules can be implemented in the form of hardware or software functional modules.
  • the communication device 70 provided in this embodiment of the application is used to implement the function of the core network device in the above method.
  • the communication device 70 may be a core network device, a device in a core network device, or a device that can be matched and used with a core network device.
  • the communication device 70 may be a chip system.
  • the chip system may be composed of chips, or may include chips and other discrete devices.
  • the communication device 70 may include: an obtaining unit 701 and a processing unit 702.
  • the obtaining unit 701 is configured to execute S402 in FIG. 4, or S504 in FIG. 5, or S601 in FIG.
  • the processing unit 702 is used to perform S403 in Figure 4, or S505 in Figure 5, or S602 in Figure 6, or S702 in Figure 6a, or S1304 in Figure 13 , Or S1405 in Figure 14, or S1508 in Figure 15, or S1610 in Figure 16.
  • S403 in Figure 4 or S505 in Figure 5, or S602 in Figure 6, or S702 in Figure 6a, or S1304 in Figure 13 , Or S1405 in Figure 14, or S1508 in Figure 15, or S1610 in Figure 16.
  • the communication device 70 may further include a sending unit 703, configured to execute S503a in FIG. 5, or S1305 in FIG. 13, or S1406 in FIG. 14, or S1504 in FIG. 15, or S1604 and S1608 in Figure 16.
  • a communication device 80 provided by an embodiment of the application is used to implement the function of the core network device in the above method.
  • the communication device 80 may be a core network device, a device in a core network device, or a device that can be matched and used with a core network device. Wherein, the communication device 80 may be a chip system.
  • the communication device 80 includes at least one processing module 801, configured to implement the function of the core network device in the method provided in the embodiment of the present application.
  • the processing module 801 may be used to execute the processes S402 and S403 in FIG. 4, or the processes S504 and S505 in FIG. 5, or the processes S601 and S602 in FIG. 6, or the process S701 in FIG. 6a.
  • the communication device 80 may also include at least one storage module 802 for storing program instructions and/or data.
  • the storage module 802 and the processing module 801 are coupled.
  • the coupling in the embodiments of the present application is an indirect coupling or communication connection between devices, units, or modules, and may be in electrical, mechanical or other forms, and is used for information exchange between devices, units or modules.
  • the processing module 801 may cooperate with the storage module 802 to operate.
  • the processing module 801 may execute program instructions stored in the storage module 802. At least one of the at least one storage module may be included in the processing module.
  • the communication device 80 may further include a communication module 803 for communicating with other devices through a transmission medium, so as to determine that the device in the communication device 80 can communicate with other devices.
  • the communication module 803 is used for the device to communicate with other devices.
  • the processing module 801 uses the communication module 803 to execute the process S503a in FIG. 5 or S1305 in FIG. 13, or S1406 in FIG. 14, or S1504 in FIG. 15, or S1604 and S1608 in FIG.
  • the processing module 801 is a processor
  • the storage module 802 is a memory
  • the communication module 803 is a communication interface
  • the communication device 80 involved in FIG. 8 in the embodiment of the present application may be the communication device 30 shown in FIG. 3.
  • the communication device 70 or the communication device 80 provided in the embodiments of the present application can be used to implement the functions of the core network equipment in the methods implemented by the various embodiments of the present application.
  • the functions related to the embodiments of the present application are shown. Please refer to the various embodiments of this application if the specific technical details are not disclosed.
  • the communication device 90 provided in this embodiment of the present application is used to implement the function of the V2X terminal in the foregoing method.
  • the communication device 90 may be a terminal, a device in a V2X terminal, or a device that can be matched and used with a V2X terminal.
  • the communication device 90 may be a chip system.
  • the chip system may be composed of chips, or may include chips and other discrete devices.
  • the communication device 90 may include: a determining unit 901 and a sending unit 902.
  • the determining unit 901 is used to determine when the V2X terminal uses the PC5 interface of the base station scheduling mode to communicate and transmit V2X service data, or the V2X terminal uses the spectrum controlled by the current camping cell to transmit V2X service data; the sending unit 902 is used to perform the process in FIG. 4 S401, S404, or S1301 in Fig. 13, or S1402, S1407 in Fig. 14, or S1501, S1506 in Fig. 15, or S1601, S1606 in Fig. 16. Among them, all relevant content of each step involved in the above method embodiment can be cited in the function description of the corresponding function module, and will not be repeated here.
  • a communication device 100 provided by an embodiment of the application is used to implement the function of the V2X terminal in the above method.
  • the communication device 100 may be a V2X terminal, a device in a V2X terminal, or a device that can be matched and used with a V2X terminal.
  • the communication device 100 may be a chip system.
  • the chip system may be composed of chips, or may include chips and other discrete devices.
  • the communication device 100 includes at least one processing module 1001, configured to implement the function of the V2X terminal in the method provided in the embodiment of the present application.
  • the processing module 1001 can be used to determine when the V2X terminal uses the PC5 interface of the base station scheduling mode to communicate and transmit V2X service data, or the V2X terminal uses the spectrum controlled by the current camping cell to transmit V2X service data.
  • the processing module 1001 can be used to determine when the V2X terminal uses the PC5 interface of the base station scheduling mode to communicate and transmit V2X service data, or the V2X terminal uses the spectrum controlled by the current camping cell to transmit V2X service data.
  • the communication device 100 may also include at least one storage module 1002 for storing program instructions and/or data.
  • the storage module 1002 and the processing module 1001 are coupled.
  • the coupling in the embodiments of the present application is an indirect coupling or communication connection between devices, units, or modules, and may be in electrical, mechanical or other forms, and is used for information exchange between devices, units or modules.
  • the processing module 1001 may cooperate with the storage module 1002.
  • the processing module 1001 may execute program instructions stored in the storage module 1002. At least one of the at least one storage module may be included in the processing module.
  • the communication device 100 may further include a communication module 1003 for communicating with other devices through a transmission medium, so that the device used in the communication device 100 can communicate with other devices.
  • the communication module 1003 is used for the device to communicate with other devices.
  • the processing module 1001 uses the communication module 1003 to execute the processes S401 and S404 in FIG. 4, or S1301 in FIG. 13, or S1402, S1407 in FIG. 14, or S1501, S1506 in FIG. 15, or S1506 in FIG. S1601, S1606.
  • the processing module 1001 is a processor
  • the storage module 1002 is a memory
  • the communication module 1003 is a communication interface
  • the communication device 100 involved in FIG. 10 in the embodiment of the present application may be the communication device 30 shown in FIG. 3.
  • the communication device 90 or the communication device 100 provided in the embodiments of the present application can be used to implement the functions of the V2X terminal in the methods implemented by the various embodiments of the present application.
  • the communication device 90 or the communication device 100 provided in the embodiments of the present application can be used to implement the functions of the V2X terminal in the methods implemented by the various embodiments of the present application.
  • the communication device 90 or the communication device 100 provided in the embodiments of the present application can be used to implement the functions of the V2X terminal in the methods implemented by the various embodiments of the present application.
  • the communication device 90 or the communication device 100 provided in the embodiments of the present application can be used to implement the functions of the V2X terminal in the methods implemented by the various embodiments of the present application.
  • the communication device 90 or the communication device 100 provided in the embodiments of the present application can be used to implement the functions of the V2X terminal in the methods implemented by the various embodiments of the present application.
  • only those related to the embodiments of the present application are shown. Please refer to the various
  • the communication device 110 provided in this embodiment of the present application is used to implement the function of the access network device in the foregoing method.
  • the communication device 110 may be an access network device, a device in an access network device, or a device that can be matched and used with the access network device.
  • the communication device 1100 may be a chip system.
  • the chip system may be composed of chips, or may include chips and other discrete devices.
  • the communication device 110 may include: a receiving unit 1101 and a sending unit 1102.
  • the receiving unit 1101 is used to execute S502 and S503b in Figure 5, or S1504, S1506 in Figure 15, or S1604, S1606, S1608 in Figure 16, and the sending unit 1102 is used to execute S503 in Figure 5, or S503 in Figure 15 S1505, S1507, or S1605, S1609, S1612 in Figure 16.
  • S1505, S1507, or S1605, S1609, S1612 in Figure 16 all relevant content of each step involved in the above method embodiment can be cited in the function description of the corresponding function module, and will not be repeated here.
  • a communication device 120 provided in an embodiment of this application is used to implement the function of the access network device in the foregoing method.
  • the communication device 120 may be an access network device, a device in an access network device, or a device that can be matched and used with the access network device. Wherein, the communication device 120 may be a chip system.
  • the communication device 120 includes at least one processing module 1201, which is used to implement the function of the access network device in the method provided in the embodiment of the present application. For details, refer to the detailed description in the method example, which is not repeated here.
  • the communication device 120 may also include at least one storage module 1202 for storing program instructions and/or data.
  • the storage module 1202 and the processing module 1201 are coupled.
  • the coupling in the embodiments of the present application is an indirect coupling or communication connection between devices, units, or modules, and may be in electrical, mechanical or other forms, and is used for information exchange between devices, units or modules.
  • the processing module 1201 may cooperate with the storage module 1202.
  • the processing module 1201 may execute program instructions stored in the storage module 1202. At least one of the at least one storage module may be included in the processing module.
  • the communication device 120 may further include a communication module 1203 for communicating with other devices through a transmission medium, so as to determine that the device in the communication device 120 can communicate with other devices.
  • the communication module 1203 is used for the device to communicate with other devices.
  • the processing module 1201 uses the communication module 1203 to execute the processes S502, S503, and S503b in FIG. 5, or S1504, S1505, S1506, and S1507 in FIG. 15, or S1604, S1605, S1606, S1608, and S1609 in FIG. , S1612.
  • the processing module 1201 is a processor
  • the storage module 1202 is a memory
  • the communication module 1203 is a communication interface
  • the communication device 120 involved in FIG. 12 in the embodiment of the present application may be the communication device 30 shown in FIG. 3.
  • the communication device 110 or the communication device 120 provided by the embodiments of the present application can be used to implement the functions of the core network equipment in the methods implemented by the various embodiments of the present application.
  • the functions related to the embodiments of the present application are shown. Please refer to the various embodiments of this application if the specific technical details are not disclosed.
  • FIG. 13 is a flowchart of the communication method. As shown in FIG. 13, the method may include:
  • V2X UE has mode1 PC5 communication requirements, V2X UE sends a registration request message to AMF, and the registration request message carries information elements that do not release the N2 connection.
  • the function of not releasing the cells of the N2 connection is: request to maintain or not release the N1 connection between the AMF and the V2X UE, or request to maintain or not release the N2 connection between the V2X UE and the AMF and the V2X UE’s NG-RAN, Either request to maintain or not release the RRC connection between the V2X UE and the NG-RAN, or request the NG-RAN to retain the context of the V2X UE stored internally, or request the V2X UE to keep the connected state.
  • the registration request message in S1301 is based on the registration request message in S201 and carries information elements that do not release the N2 connection.
  • the AMF obtains the V2X UE's subscription information from the UDM according to the V2X UE's identification information.
  • the AMF selects the PCF, and establishes the AMF-PCF association relationship.
  • the AMF maintains or does not release the V2X UE communication connection between the AMF and the access network device of the V2X terminal based on not releasing the information element of the N2 connection.
  • the AMF may be based on the information element that does not release the N2 connection in the registration request message and at least one of the following information: V2X UE type (for example, the type of UE is V2X), V2X UE capability information (for example, the UE supports PC5 interface communication) and NG-RAN capability information (for example, NG-RAN supports PC5 interface communication) maintain or not release the V2X UE communication connection between the AMF and the access network equipment of the V2X terminal.
  • V2X UE type for example, the type of UE is V2X
  • V2X UE capability information For example, the UE supports PC5 interface communication
  • NG-RAN capability information for example, NG-RAN supports PC5 interface communication
  • the capability information of the V2X UE may be the capability in the subscription information of the V2X UE, or may also be the capability information sent by the V2X UE, which is not specifically limited in the embodiment of the application.
  • the AMF receives the information element "Do not release the N2 connection"
  • the UE's subscription information indicates that the type of the UE is V2X
  • the N2 connection is not released.
  • the AMF when the AMF receives the cell of "not release the N2 connection", and when the UE supports PC5 interface communication, the N2 connection is not released.
  • the AMF when the AMF receives the information element of "not releasing the N2 connection", and when the UE's subscription information indicates that the type of the UE is V2X, and when the UE supports PC5 interface communication, the N2 connection is not released.
  • the AMF sends a registration acceptance message (registration accept message) to the V2X UE.
  • S1305 can refer to the specific implementation of S204, which will not be repeated here.
  • S1305 can be implemented as S1305a to S1305c.
  • the AMF sends an NGAP message to the NG-RAN.
  • the NGAP message includes a registration acceptance message and a second instruction.
  • the second indication is used to instruct the NG-RAN to maintain or not release the V2X UE's N2 connection between the AMF and the NG-RAN.
  • the NG-RAN sets the first duration according to the second instruction.
  • S1305b can refer to S407b, which will not be repeated here.
  • the NG-RAN sends an RRC message to the V2X UE.
  • the RRC message carries a registration acceptance message.
  • FIG. 14 is a flowchart of the communication method, as shown in Figure 14, the method may include:
  • V2X UE has mode1 PC5 communication requirements, V2X UE triggers the registration process + service request process (Registration Request + Service Request).
  • the V2X UE sends a registration request message to the AMF, where the registration request message carries an identity (ID) of the follow-on request.
  • ID an identity
  • the ID of the follow-on request is the first indication described in S401, which is used to indicate that the V2X UE has uplink signaling to be processed.
  • the registration request message in S1402 is based on the registration request message in S201 and carries the ID of the follow-on request.
  • the AMF obtains the V2X UE's subscription information from the UDM according to the V2X UE's identification information.
  • AMF selects PCF, and establishes an AMF-PCF association relationship.
  • the AMF Based on the ID of the follow-on request, the AMF maintains or does not release the communication connection between the V2X UE between the AMF and the NG-RAN of the V2X terminal.
  • the AMF may be based on the ID of the follow-on request in the registration request message, and the subscription information of the V2X UE (for example, the type of the UE is V2X) or the capability information of the V2X UE (for example, the UE supports the PC5 interface Communication), maintaining or not releasing the V2X UE's communication connection between the AMF and the V2X terminal's access network equipment.
  • the subscription information of the V2X UE for example, the type of the UE is V2X
  • the capability information of the V2X UE for example, the UE supports the PC5 interface Communication
  • the capability information of the V2X UE may be the capability in the subscription information of the V2X UE, or may also be the capability information sent by the V2X UE, which is not specifically limited in the embodiment of the application.
  • the AMF sends a registration acceptance message (registration accept message) to the V2X UE.
  • S1406 can refer to the specific implementation of S204, which will not be repeated here.
  • S1406 can be implemented as S1406a to S1406c.
  • the AMF sends an NGAP message to the NG-RAN.
  • the NGAP message includes a registration acceptance message and a second instruction.
  • the second indication is used to instruct the NG-RAN to maintain or not release the V2X UE's N2 connection between the AMF and the NG-RAN.
  • the NG-RAN sets the first duration according to the second instruction.
  • S1406b can refer to S407b, which will not be repeated here.
  • the NG-RAN sends an RRC message to the V2X UE, and the RRC message carries a registration acceptance message.
  • the V2X UE sends a service request (SR) message to the AMF after receiving the registration acceptance message.
  • SR service request
  • the SR message is used to request that the user plane resource is not activated.
  • the SR is used to keep the V2X UE in the connected state, or to keep the N2 connection, or not to release the N2 connection.
  • the SR message does not carry the PDU session to be activated cell, that is, the UE will not further activate user plane resources (in other words, it will not activate a certain PDU session).
  • the AMF receives the SR message.
  • the AMF executes the Service Request process in the standard 3GPP TS 23.502.
  • the process is the same as the process when the V2X terminal transitions from the idle state to the connected state, and will not be repeated here.
  • the embodiments of this application provide yet another communication method, which is applied to the interaction process of V2X terminal (V2X UE), access network equipment (NG-RAN), and core network equipment (AMF) in a 5G communication system 15 is a flowchart of the communication method. As shown in FIG. 15, the method may include:
  • V2X UE sends a registration request message to AMF.
  • the AMF obtains the V2X UE's subscription information from the UDM according to the V2X UE's identification information.
  • AMF selects PCF, and establishes an AMF-PCF association relationship.
  • the AMF sends an NGAP message to the NG-RAN, carrying a registration acceptance message, and starts a T3540 timer.
  • the AMF releases the communication connection between the V2X UE and the access network equipment of the V2X terminal.
  • the NG-RAN sends an RRC message to the V2X UE.
  • the RRC message carries a registration acceptance message.
  • the V2X UE After the V2X UE receives the registration acceptance message, the V2X UE needs mode1 PC5 communication, and the V2X UE sends an RRC message to the NG-RAN to request resources.
  • the NG-RAN After receiving the RRC message requesting resources, the NG-RAN sends an NGAP message to the AMF, and the NGAP message carries indication information.
  • the indication information can inform AMF that V2X UE has ongoing PC5 interface communication.
  • S1507 can be replaced with: after the NG-RAN receives the RRC message requesting resources, if the V2X UE is in the connected state, it sends an NGAP message to the AMF.
  • the NGAP message carries indication information, that is, this solution only It is applicable when the T3540 timer of AMF has not expired.
  • the AMF stops the T3540 timer according to the instruction information.
  • the AMF stops the T3540 timer according to the instruction information, so as to maintain or not release the V2X UE communication connection between the AMF and the V2X terminal's access network equipment.
  • Fig. 16 is a flowchart of the communication method. As shown in Fig. 16, the method may include:
  • V2X UE sends a registration request message to AMF.
  • AMF obtains the V2X UE's subscription information from the UDM according to the V2X UE's identification information.
  • AMF selects PCF, and establishes an AMF-PCF association relationship.
  • the AMF sends an NGAP message to the NG-RAN, carrying a registration acceptance message, and starts a T3540 timer.
  • the AMF sends an NGAP message for releasing the N2 connection to the NG-RAN to release the communication connection between the V2X UE and the access network equipment of the V2X terminal.
  • the NG-RAN sends an RRC message to the V2X UE.
  • the RRC message carries a registration acceptance message.
  • the V2X UE After the V2X UE receives the registration acceptance message, the V2X UE needs mode1 PC5 communication, and the V2X UE sends an RRC message to the NG-RAN to request resources.
  • the NG-RAN After receiving the RRC message requesting resources, the NG-RAN starts the first timer.
  • the NG-RAN receives the NGAP message sent by the AMF for releasing the N2 connection.
  • the NG-RAN executes S1609.
  • the NG-RAN sends an NGAP message for refusing to release the N2 connection to the AMF.
  • the NGAP message used to refuse to release the N2 connection sent by the NG-RAN to the AMF may carry a specific rejection reason value.
  • the cause value can be that the V2X UE has ongoing mode1 PC5 interface communication.
  • the AMF judges whether it is necessary to continue the attempt to release the N2 connection according to the reason value in the rejection message of the RAN.
  • the AMF when the AMF needs to release the N2 connection due to the failure of the AMF, the AMF will send the NGAP message again. If AMF is only due to V2X UE having ongoing mode1 PC5 interface communication, AMF will not send further NGAP messages.
  • the communication method may further include S1611 and S1612 to prevent the V2X UE mode1PC5 interface from being communicated without releasing the N2 connection.
  • the NG-RAN starts a timer used to determine that the user plane of the V2X UE is idle.
  • the NG-RAN After the timer used to determine that the user plane of the V2X UE is idle has expired, the NG-RAN initiates the release of the N2 connection.
  • an embodiment of the present application provides a communication system, which includes a first communication device and a second communication device, the first communication device can realize the function of the core network device, and the second communication device can realize V2X The function of the terminal.
  • the first communication device is the core network device described in the embodiment of this application
  • the second communication device is the V2X terminal described in the embodiment of this application.
  • an embodiment of the present application provides a communication system, which includes a third communication device and a fourth communication device, the third communication device can realize the function of the core network device, and the fourth communication device can realize the connection The function of the networked device.
  • the third communication device is the core network device described in the embodiment of this application
  • the fourth communication device is the access network device described in the embodiment of this application.
  • a computer-readable storage medium is provided, and an instruction is stored thereon, and the method in the foregoing method embodiment is executed when the instruction is executed.
  • a computer program product containing instructions is provided, and when the instructions are executed, the method in the foregoing method embodiment is executed.
  • the embodiment of the present application further provides a chip system.
  • the chip system includes a processor for implementing the technical method in the embodiment of the present invention.
  • the chip system further includes a memory for storing necessary program instructions and/or data of the communication device in the embodiment of the present invention.
  • the chip system further includes a memory for the processor to call application program codes stored in the memory.
  • the chip system may be composed of one or more chips, and may also include chips and other discrete devices, which are not specifically limited in the embodiment of the present application.
  • the steps of the method or algorithm described in conjunction with the disclosure of this application can be implemented in a hardware manner, or implemented in a manner in which a processor executes software instructions.
  • Software instructions can be composed of corresponding software modules, which can be stored in RAM, flash memory, ROM, erasable programmable read-only memory (erasable programmable ROM, EPROM), electrically erasable programmable read-only memory (electrically erasable programmable read-only memory, EPROM, EEPROM), registers, hard disk, mobile hard disk, CD-ROM or any other form of storage medium known in the art.
  • An exemplary storage medium is coupled to the processor, so that the processor can read information from the storage medium and can write information to the storage medium.
  • the storage medium may also be an integral part of the processor.
  • the processor and the storage medium may be located in the ASIC.
  • the ASIC may be located in the core network interface device.
  • the processor and the storage medium may also exist as discrete components in the core network interface device.
  • the memory may be coupled with the processor.
  • the memory may exist independently and be connected to the processor through a bus.
  • the memory can also be integrated with the processor.
  • the memory may be used to store application program codes for executing the technical solutions provided in the embodiments of the present application, and the processor controls the execution.
  • the processor is used to execute the application program code stored in the memory, so as to implement the technical solutions provided in the embodiments of the present application.
  • the disclosed device and method may be implemented in other ways.
  • the device embodiments described above are merely illustrative.
  • the division of the modules or units is only a logical function division.
  • there may be other division methods for example, multiple units or components may be It can be combined or integrated into another device, or some features can be omitted or not implemented.
  • the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices or units, and may be in electrical, mechanical or other forms.
  • the units described as separate parts may or may not be physically separate.
  • the parts displayed as units may be one physical unit or multiple physical units, that is, they may be located in one place, or they may be distributed to multiple different places. . Some or all of the units may be selected according to actual needs to achieve the objectives of the solutions of the embodiments.
  • each unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units may be integrated into one unit.
  • the above-mentioned integrated unit can be implemented in the form of hardware or software functional unit.
  • the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a readable storage medium.
  • the technical solutions of the embodiments of the present application are essentially or the part that contributes to the prior art, or all or part of the technical solutions can be embodied in the form of software products, which are stored in a storage medium.
  • a device which may be a single-chip microcomputer, a chip, etc.
  • a processor processor
  • the aforementioned storage media include: U disk, mobile hard disk, ROM, RAM, magnetic disk or optical disk and other media that can store program codes.

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Abstract

本申请实施例公开了一种通信方法、装置及系统，涉及通信领域，以实现接入网设备保留V2X终端的上下文，进而保证V2X终端实现PC5接口通信。所述方法包括：核心网设备获取用于指示V2X终端支持PC5接口通信的能力信息；核心网设备根据获取的能力信息，在V2X终端完成注册后保持或不释放V2X终端与核心网设备之间的信令连接。

Description

一种通信方法、装置及系统
本申请要求于2019年05月15日提交国家知识产权局、申请号为201910408185.2、发明名称为“一种通信方法、装置及系统”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请实施例涉及通信领域，尤其涉及一种通信方法、装置及系统。
背景技术
随着通信技术的快速发展，车辆对所有(vehicle to everything，V2X)技术已广泛应用。V2X系统可以采用两种通信方式，一种是Uu接口通信，即以基站作为控制中心，将车辆与基础设施、或车辆与其他车辆之间的数据通过基站的Uu接口进行传输；另一种是PC5接口通信，即车辆之间数据通过PC5接口进行直接传输。
在V2X通信中，若V2X终端在蜂窝网络的覆盖下，那么V2X终端在蜂窝网络覆盖的区域内既可以通过Uu接口进行通信，以实现大带宽、大覆盖的通信，也可以通过PC5接口进行通信，以实现车辆与周边环境节点低时延、高可靠的直接通信；若V2X终端在蜂窝网络的覆盖之外，那么V2X设备在无网络部署的区域内可以通过PC5接口进行通信，满足行车安全需求。
对于PC5接口通信，虽然V2X终端的数据无需通过基站进行中转，但在某些场景下也需要基站依据该V2X终端的上下文为该V2X终端分配PC5接口的资源，例如，基站调度模式的PC5接口通信。但是，按照第五代(the 5th generation，5G)移动通信系统通信机制，终端在接入网络时，向网络发起注册，以建立终端与接入网设备之间以及接入网设备与核心网设备之间的连接。在终端完成注册之后，核心网设备若判断终端没有数据或信令传输需求，核心网设备可能会发起通信连接和信令连接释放以节约资源。通信连接和信令连接的释放过程中，接入网设备会删除保存的终端的上下文。那么，接入网设备如何保留V2X终端的上下文成为亟待解决的问题。
发明内容
本申请实施例提供一种通信方法、装置及系统，以实现接入网设备保留V2X终端的上下文，进而保证V2X终端实现PC5接口通信。
为达到上述目的，本申请实施例采用如下技术方案：
第一方面，提供一种通信方法，该方法可以包括：核心网设备获取指示信息，该指示信息用于指示在V2X终端完成注册后保持或不释放核心网设备与该V2X终端之间的信令连接，或者，该指示信息用于指示在V2X终端完成注册后保持或不释放该V2X终端在核心网设备与V2X终端的接入网设备之间的通信连接；核心网设备根据获取的指示信息，保持或不释放V2X终端在核心网设备与V2X终端的接入网设备之间的通信连接。
通过本申请提供的通信方法，核心网设备根据指示信息保持或不释放V2X终端在核心网设备与V2X终端的接入网设备之间的通信连接，这样一来，V2X终端注册阶段 接入网设备保存的该V2X终端的上下文得以保留，以支持接入网设备依据V2X终端的上下文为V2X终端分配PC5接口的资源，保证了V2X终端实现PC5接口通信。
具体的，在无线通信中终端向网络发起注册，通过注册流程，建立了核心网设备与终端之间的信令连接(例如5G中的N1连接)、终端在核心网设备与该终端的接入网设备之间的通信连接(例如5G中的N2连接)以及终端与接入网设备之间的连接(例如5G中的RRC连接)，并且使得终端进入了连接态。在终端完成注册之后，核心网设备若判断终端没有数据或信令传输需求，核心网设备通过向接入网设备发送连接释放请求消息，以实现释放核心网设备与终端之间的信令连接、释放该终端在核心网设备与该终端的接入网设备之间的通信连接、以及释放该终端与其接入网设备之间的连接，同时接入网设备删除内部保存的该终端的上下文，这时候该终端进入了空闲态。可见，释放核心网设备与终端之间的信令连接、释放终端在核心网设备与终端的接入网设备之间的通信连接、释放终端与接入网设备之间的连接、接入网设备删除内部保存的终端的上下文、终端进入空闲态，是相互等价的概念，可以相互替换。
换言之，保持或不释放核心网设备与终端之间的信令连接、保持或不释放终端在核心网设备与该终端的接入网设备之间的通信连接、保持或不释放终端与接入网设备之间的连接、接入网设备保留内部保存的终端的上下文、终端保持连接态，是相互等价的概念，可以相互替换。
因此，本申请中描述的指示信息，除了上述用于指示在V2X终端完成注册后保持或不释放核心网设备与该V2X终端之间的信令连接，或者，该指示信息用于指示在V2X终端完成注册后保持或不释放该V2X终端在核心网设备与V2X终端的接入网设备之间的通信连接之外，指示信息还可以用于指示在V2X终端完成注册后保持或不释放接入网设备与该V2X终端之间的连接；或者，指示信息还可以用于指示在V2X终端完成注册后接入网设备保留内部保存的终端的上下文，或者，指示信息还可以用于指示在V2X终端完成注册后V2X终端保持连接态。
在一种可能的实现方式中，核心网设备获取指示信息具体可以实现为：核心网设备接收来自V2X终端的指示信息。在该实现方式中，由V2X终端通过指示信息指示核心网设备在V2X终端完成注册后，保持或者不释放连接，以实现接入网设备保留V2X终端的上下文，进而保证V2X终端实现PC5接口通信。
例如，V2X终端可以在确定存在需接入网设备分配资源的PC5接口通信需求，向核心网设备发送该指示信息。
在一种可能的实现方式中，V2X终端可以将指示消息携带在注册请求消息中发送。复用现有注册流程中的消息实现指示信息的发送，节约信令资源。
在一种可能的实现方式中，V2X终端可以向核心网设备单独发送指示消息。避免对现有注册流程中的消息的更改，实现简单兼容度高。
在一种可能的实现方式中，当核心网设备接收来自V2X终端的指示信息时，指示信息可以包括以下一种或多种：V2X终端的类型，第一指示，和用于指示V2X终端支持PC5接口通信的能力信息。其中，第一指示用于指示V2X终端存在待处理的上行信令。核心网设备根据V2X终端的指示，对具备类型为V2X、支持PC5接口通信和存在待处理的上行信令中一种或多种特征的特征的V2X终端，保持或不释放连接，以 实现接入网设备保留V2X终端的上下文，进而保证V2X终端实现PC5接口通信。
其中，存在待处理的上行信令，可以等价于：存在待处理的第一服务请求(service request)之外的其他上行非接入层(non-access stratum，NAS)消息，第一服务请求用于激活用户面资源；或者，存在待处理的第二服务请求，第二服务请求用于不激活用户面资源，可以相互替换。
在一种可能的实现方式中，指示信息可以包括以下一种或多种：V2X终端的类型，和V2X终端支持PC5接口通信的能力信息。相应的，核心网设备获取指示信息，可以实现为：核心网设备从V2X终端的签约信息获取指示信息。核心网设备从签约信息获取指示信息，仅需修改核心网设备的处理逻辑，其他网元的逻辑均不修改，实现简单且兼容度高。
其中，核心网设备可以根据V2X终端的标识，从签约信息管理网元获取该V2X终端的签约信息。
在一种可能的实现中，指示信息可以包括：用于指示V2X终端正在进行PC5接口通信的信息，或者，用于指示接入网设备支持PC5接口通信的能力信息。相应的，核心网设备获取指示信息，可以实现为：核心网设备接收来自接入网设备的指示信息。核心网设备从接入网设备获取指示信息，仅需修改接入网设备的处理逻辑，减少了对V2X终端的影响。
在一种可能的实现中，指示信息可以包括连接释放请求消息的拒绝消息。该连接释放请求消息用于释放V2X终端在核心网设备与该V2X终端的接入网设备之间的通信连接。相应的，本申请提供的通信方法还可以包括：核心网设备向接入网设备发送连接释放请求消息。相应的，核心网设备获取指示信息，具体可以实现为：核心网设备接收来自接入网设备的连接释放请求消息的拒绝消息。核心网设备从接入网设备获取指示信息，仅需修改接入网设备的处理逻辑，减少了对V2X终端的影响。
在一种可能的实现中，核心网设备根据指示信息，保持或不释放V2X终端在核心网设备与V2X终端的接入网设备之间的通信连接，具体可以实现为：核心网设备根据指示信息，不向接入网设备发送连接释放请求消息。
具体的，核心网设备向接入网设备发送连接释放请求消息可以实现为：核心网设备启动定时器，在定时器超时后向接入网设备发送连接释放请求消息。相应的，核心网设备根据指示信息，不向接入网设备发送连接释放请求消息，具体可以实现为：核心网在接收到指示信息后，不启动定时器；或者，核心网在接收到指示信息后，取消已经启动但还未超时的定时器。
第二方面，本申请提供另一种通信方法，该方法可以包括：当V2X终端采用基站调度模式的PC5接口通信传输V2X业务数据时，或者，当V2X终端采用当前驻留小区控制的频谱传输V2X业务数据时，该V2X终端向核心网设备发送指示信息，该指示信息用于指示在V2X终端完成注册后保持或不释放核心网设备与V2X终端之间的信令连接，或者，该指示信息用于指示在V2X终端完成注册后保持或不释放V2X终端在核心网设备与V2X终端的接入网设备之间的通信连接；之后，V2X终端向V2X终端的接入网设备发送资源请求消息，该资源请求消息用于向接入网设备请求PC5接口通信资源，PC5接口通信资源用于传输V2X业务数据。
通过本申请提供的通信方法，当V2X终端存在需接入网设备分配资源的PC5接口通信需求时，V2X终端向核心网设备发送指示信息，以使得核心网设备根据指示信息保持或不释放V2X终端在核心网设备与V2X终端的接入网设备之间的通信连接，这样一来，V2X终端注册阶段接入网设备保存的该V2X终端的上下文得以保留，以支持接入网设备依据V2X终端的上下文为V2X终端分配PC5接口的资源，保证了V2X终端实现PC5接口通信。
需要说明的是，本申请第二方面提供的通信方法，与上述第一方面提供的通信方法的方案内容相同，只是描述的角度不同，上述第一方面从核心网设备的就角度描述了方案的具体实现，本申请第二方面从V2X终端的角度描述方案，因此，第二方面的具体实现可以参照上述第一方面及时各实现方式的具体实现。
其中，V2X终端采用基站调度模式的PC5接口通信传输V2X业务数据，可以理解为：V2X终端确定采用基站调度模式的PC5接口通信传输V2X业务数据，两者可以相互替换。V2X终端采用当前驻留小区控制的频谱传输V2X业务数据，可以理解为：V2X终端确定采用当前驻留小区控制的频谱传输V2X业务数据，两者可以相互替换。
一种可能的实现方式中，该V2X终端向核心网设备发送指示信息，具体可以实现为：V2X终端向核心网设备发送注册请求消息，注册请求消息携带指示信息。在该实现方式中，由V2X终端通过指示信息指示核心网设备在V2X终端完成注册后，保持或者不释放连接，以实现接入网设备保留V2X终端的上下文，进而保证V2X终端实现PC5接口通信。复用现有注册流程中的消息实现指示信息的发送，节约信令资源。
在一种可能的实现方式中，该V2X终端向核心网设备发送指示信息，具体可以实现为：V2X终端向核心网设备发送指示信息。避免对现有注册流程中的消息的更改，实现简单兼容度高。
在一种可能的实现方式中，指示信息可以包括以下一种或多种：V2X终端的类型，第一指示，和V2X终端支持PC5接口通信的能力信息。其中，第一指示用于指示该V2X终端存在待处理的上行信令。V2X终端通过指示信息，请求核心网设备对具备类型为V2X、支持PC5接口通信和存在待处理的上行信令中一种或多种特征的特征，保持或不释放连接，以实现接入网设备保留V2X终端的上下文，进而保证V2X终端实现PC5接口通信。
需要说明的是，对于存在待处理的上行信令，已经在上述第一方面中进行了详细描述，此处不再进行赘述。
在一种可能的实现方式中，当指示信息包括第一指示时，本申请第二方面提供的通信方法还可以包括：V2X终端在接收到注册接受消息(registration accept message)后，向核心网设备发送NAS消息，该NAS消息包括服务请求消息，该服务请求消息用于请求不激活用户面资源。
第三方面，本申请提供再一种通信方法，该方法可以包括：接入网设备接收来自V2X终端的资源请求消息，该资源请求消息用于请求为该V2X终端分配PC5接口通信资源；接入网设备根据资源请求消息，向核心网设备发送指示信息，该指示信息用于指示在V2X终端完成注册后保持或不释放核心网设备与V2X终端之间的信令连接，或者，该指示信息用于指示在V2X终端完成注册后保持或不释放V2X终端在核心网 设备与该V2X终端接入网设备之间的通信连接。
通过本申请提供的通信方法，当接入网设备接收来自V2X终端的资源请求消息时接入网设备确定V2X终端存在需接入网设备分配资源的PC5接口通信需求，接入网设备向核心网设备发送指示信息，以使得核心网设备根据指示信息保持或不释放V2X终端在核心网设备与V2X终端的接入网设备之间的通信连接，这样一来，V2X终端注册阶段接入网设备保存的该V2X终端的上下文得以保留，以支持接入网设备依据V2X终端的上下文为V2X终端分配PC5接口的资源，保证了V2X终端实现PC5接口通信。
其中，接入网设备接收来自V2X终端的资源请求消息可以理解为：接入网设备获取到V2X终端正在进行PC5接口通信的信息，两者可以相互替换。
需要说明的是，本申请第三方面提供的通信方法，与上述第一方面提供的通信方法的方案内容相同，只是描述的角度不同，上述第一方面从核心网设备的就角度描述了方案的具体实现，本申请第三方面从接入网设备的角度描述方案，因此，第三方面的具体实现可以参照上述第一方面及时各实现方式的具体实现。
在一种可能的实现方式中，指示信息包括：用于指示V2X终端正在进行PC5接口通信的信息，或者，用于指示接入网设备支持PC5通信的能力信息。在该实现方式中，提供了接入网设备提供的指示信息的具体内容，核心网设备从接入网设备获取指示信息，仅需修改接入网设备的处理逻辑，减少了对V2X终端的影响。
在一种可能的实现方式中，指示信息可以包括连接释放请求消息的拒绝消息，该连接释放请求消息用于释放V2X终端在核心网设备与该V2X终端的接入网设备之间的通信连接。接入网设备在接收到资源请求消息后，本申请实施例提供的方法还可以包括：接入网设备接收来自核心网设备的连接释放请求消息。相应的，接入网设备根据资源请求消息，向核心网设备发送指示信息，具体可以实现为：接入网设备根据资源请求消息和连接释放请求消息，向核心网设备发送连接释放请求消息的拒绝消息。在该实现方式中，提供了接入网设备提供的指示信息的具体内容，核心网设备从接入网设备获取指示信息，仅需修改接入网设备的处理逻辑，减少了对V2X终端的影响。
在一种可能的实现方式中，接入网设备根据资源请求消息和连接释放请求消息，向核心网设备发送连接释放请求消息的拒绝消息，具体可以实现为：接入网设备在接收到资源请求消息时，启动定时器；若接入网设备在接收到连接释放请求消息时该定时器未超时，则接入网设备向核心网设备发送连接释放请求消息的拒绝消息。配置定时器以控制为V2X终端的PC5接口通信保持或不释放连接的时长，避免长期保持或不释放连接对网络性能的影响。
第四方面，本申请提供另一种通信方法，包括：核心网设备获取用于指示V2X终端支持PC5接口通信的能力信息；核心网设备根据能力信息，在V2X终端完成注册后保持或不释放V2X终端与核心网设备之间的信令连接。
通过本申请提供的通信方法，核心网设备根据指示V2X终端支持PC5接口通信的能力信息，在V2X终端完成注册后保持或不释放V2X终端与核心网设备之间的信令连接，这样一来，V2X终端注册阶段接入网设备保存的该V2X终端的上下文得以保留，以支持接入网设备依据V2X终端的上下文为V2X终端分配PC5接口的资源，保证了V2X终端实现PC5接口通信。
在一种可能的实现方式中，核心网设备获取用于指示V2X终端支持PC5接口通信的能力信息，具体可以实现为：核心网设备可以接收来自V2X终端的该能力信息。在该实现方式中，由V2X终端通过能力信息指示核心网设备在V2X终端完成注册后，保持或者不释放连接，以实现接入网设备保留V2X终端的上下文，进而保证V2X终端实现PC5接口通信。
在一种可能的实现方式中，上述能力信息可以携带在注册请求消息中。复用了现有注册流程中的消息实现上述能力信息的发送，节约信令资源。
在一种可能的实现方式中，所述核心网设备根据上述能力信息，在V2X终端完成注册后保持或不释放V2X终端与核心网设备之间的信令连接，包括：核心网设备根据该能力信息，在V2X终端完成注册后不向接入网设备发送连接释放请求消息。
在一种可能的实现方式中，核心网设备根据上述能力信息，在V2X终端完成注册后保持或不释放V2X终端与核心网设备之间的信令连接，包括：核心网设备根据V2X终端的签约信息和上述能力信息，在V2X终端完成注册后保持或不释放V2X终端与核心网设备之间的信令连接。
在一种可能的实现方式中，上述核心网设备可以为接入和移动性管理功能(access and mobility management function，AMF)。
需要说明的是，本申请第四方面提供的通信方法中的能力信息，可以作为上述第一方面提供的通信方法中的指示信息的一种可能的实现方式，第四方面提供的通信方法的具体实现可以参考前述第一方面的具体实现。
第五方面，本申请提供一种通信装置，该装置可以是核心网设备，也可以是核心网设备中的装置或者芯片系统，或者是能够和核心网设备匹配使用的装置。该通信装置可以实现上述各方面或者各可能的设计中核心网设备所执行的功能，所述功能可以通过硬件实现，也可以通过硬件执行相应的软件实现。所述硬件或软件包括一个或多个上述功能相应的模块。如：该通信装置可以包括：获取单元和处理单元。
一种可能的实现方式中，获取单元，用于获取指示信息，该指示信息用于指示在V2X终端完成注册后保持或不释放核心网设备与V2X终端之间的信令连接，或者，该指示信息用于指示在V2X终端完成注册后保持或不释放V2X终端在核心网设备与V2X终端的接入网设备之间的通信连接；处理单元，用于根据获取单元获取的指示信息，保持或不释放V2X终端在核心网设备与V2X终端的接入网设备之间的通信连接。
另一种可能的实现方式中，获取单元，用于获取用于指示V2X终端支持PC5接口通信的能力信息；处理单元，用于根据获取单元获取的能力信息，在V2X终端完成注册后保持或不释放所述V2X与所述核心网设备之间的信令连接。
需要说明的是，第五方面提供的通信装置，用于执行上述第一方面或第四方面提供的通信方法，具体实现可以参考上述第一方面或第四方面的具体实现。
第六方面，本申请提供一种通信装置，该装置可以是V2X终端，也可以是V2X终端中的装置或芯片系统，或者是能够和V2X终端匹配使用的装置。该通信装置可以实现上述各方面或者各可能的设计中V2X终端所执行的功能，所述功能可以通过硬件实现，也可以通过硬件执行相应的软件实现。所述硬件或软件包括一个或多个上述功能相应的模块。如：该通信装置可以包括：确定单元和发送单元。
其中，确定单元，用于确定V2X终端采用基站调度模式的PC5接口通信传输V2X业务数据时，或者，V2X终端采用当前驻留小区控制的频谱传输V2X业务数据；发送单元，用于当确定单元确定V2X终端采用基站调度模式的PC5接口通信传输V2X业务数据时，或者，V2X终端采用当前驻留小区控制的频谱传输V2X业务数据时，向核心网设备发送指示信息，指示信息用于指示在V2X终端完成注册后保持或不释放核心网设备与V2X终端之间的信令连接，或者，指示信息用于指示在V2X终端完成注册后保持或不释放V2X终端在核心网设备与V2X终端的接入网设备之间的通信连接；发送单元还用于，向V2X终端的接入网设备发送资源请求消息，该资源请求消息用于向接入网设备请求PC5接口通信资源，PC5接口通信资源用于传输V2X业务数据。
需要说明的是，第六方面提供的通信装置，用于执行上述第二方面提供的通信方法，具体实现可以参考上述第二方面的具体实现。
第七方面，本申请提供一种通信装置，该装置可以是V2X终端的接入网设备，也可以是接入网设备中的装置，或者是能够和接入网设备匹配使用的装置。该通信装置可以实现上述各方面或者各可能的设计中接入网设备所执行的功能，所述功能可以通过硬件实现，也可以通过硬件执行相应的软件实现。所述硬件或软件包括一个或多个上述功能相应的模块。如：该通信装置可以包括：接收单元和发送单元。
其中，接收单元，用于接收来自V2X终端的资源请求消息，该资源请求消息用于请求为V2X终端分配PC5接口通信资源；发送单元，用于根据接收单元接收的资源请求消息，向核心网设备发送指示信息，该指示信息用于指示在V2X终端完成注册后保持或不释放核心网设备与V2X终端之间的信令连接，或者，指示信息用于指示在V2X终端完成注册后保持或不释放V2X终端在核心网设备与V2X终端的接入网设备之间的通信连接。
需要说明的是，第七方面提供的通信装置，用于执行上述第三方面提供的通信方法，具体实现可以参考上述第三方面的具体实现。
第八方面，本申请实施例提供再一种通信装置，所述装置包括处理器，用于实现上述第一方面或第四方面描述的通信方法。所述装置还可以包括存储器，所述存储器与所述处理器耦合，所述处理器执行所述存储器中存储的指令时，可以实现上述第一方面或第四方面描述的通信方法。所述装置还可以包括通信接口，所述通信接口用于该装置与其它设备进行通信，示例性的，通信接口可以是收发器、电路、总线、模块或其它类型的通信接口。在一种可能的实现中，该装置包括：
存储器，用于存储指令；
处理器，用于获取指示信息，根据指示信息，保持或不释放所述V2X终端在所述核心网设备与所述V2X终端的接入网设备之间的通信连接。其中，指示信息用于指示在V2X终端完成注册后保持或不释放核心网设备与V2X终端之间的信令连接，或者，指示信息用于指示在V2X终端完成注册后保持或不释放V2X终端在核心网设备与该V2X终端的接入网设备之间的通信连接；
或者，处理器可以用于获取指示V2X终端支持PC5接口通信的能力信息，根据该能力信息，在V2X终端完成注册后保持或不释放V2X与所述核心网设备之间的信令连接。
需要说明的是，本申请中存储器中的指令可以预先存储也可以使用该装置时从互联网下载后存储，本申请对于存储器中指令的来源不进行具体限定。本申请实施例中的耦合是装置、单元或模块之间的间接耦合或连接，其可以是电性，机械或其它的形式，用于装置、单元或模块之间的信息交互。
第九方面，本申请实施例提供再一种通信装置，该装置可以是V2X终端，也可以是V2X终端中的装置或芯片系统，或者是能够和V2X终端匹配使用的装置。所述装置包括处理器，用于实现上述第二方面描述的通信方法。所述装置还可以包括存储器，所述存储器与所述处理器耦合，所述处理器执行所述存储器中存储的指令时，可以实现上述第二方面描述的通信方法。所述装置还可以包括通信接口，所述通信接口用于该装置与其它设备进行通信，示例性的，通信接口可以是收发器、电路、总线、模块或其它类型的通信接口。在一种可能的实现中，该装置包括：
存储器，用于存储指令；
处理器，用于当V2X终端采用基站调度模式的PC5接口通信传输V2X业务数据时，或者，当V2X终端采用当前驻留小区控制的频谱传输V2X业务数据时，通过通信接口向核心网设备发送指示信息，指示信息用于指示在V2X终端完成注册后保持或不释放核心网设备与V2X终端之间的信令连接，或者，指示信息用于指示在V2X终端完成注册后保持或不释放V2X终端在核心网设备与V2X终端的接入网设备之间的通信连接；
处理器还可以用于，通过通信接口向V2X终端的接入网设备发送资源请求消息，该资源请求消息用于向接入网设备请求PC5接口通信资源，PC5接口通信资源用于传输V2X业务数据。
第十方面，本申请实施例提供再一种通信装置，该装置可以是V2X终端的接入网设备，也可以是接入网设备中的装置或芯片系统，或者是能够和接入网设备匹配使用的装置。所述装置包括处理器，用于实现上述第三方面描述的通信方法。所述装置还可以包括存储器，所述存储器与所述处理器耦合，所述处理器执行所述存储器中存储的指令时，可以实现上述第三方面描述的通信方法。所述装置还可以包括通信接口，所述通信接口用于该装置与其它设备进行通信，示例性的，通信接口可以是收发器、电路、总线、模块或其它类型的通信接口。在一种可能的实现中，该装置包括：
存储器，用于存储指令；
处理器，用于通过通信接口接收来自V2X终端的资源请求消息，该资源请求消息用于请求为V2X终端分配PC5接口通信资源；根据接收的资源请求消息，通过通信接口向核心网设备发送指示信息，该指示信息用于指示在V2X终端完成注册后保持或不释放核心网设备与V2X终端之间的信令连接，或者，指示信息用于指示在V2X终端完成注册后保持或不释放V2X终端在核心网设备与V2X终端的接入网设备之间的通信连接。
第十一方面，本申请实施例中还提供一种计算机可读存储介质，包括指令，当其在计算机上运行时，使得计算机执行上述任一方面或任意一种可能的实现方式所述的通信方法。
第十二方面，本申请实施例中还提供一种计算机程序产品，当其在计算机上运行 时，使得计算机执行上述任一方面或任意一种可能的实现方式所述的通信方法。
第十三方面，本申请实施例提供了一种芯片系统，该芯片系统包括处理器，还可以包括存储器，用于实现上述方法中核心网设备的功能。该芯片系统可以由芯片构成，也可以包含芯片和其他分立器件。
第十四方面，本申请实施例提供了一种芯片系统，该芯片系统包括处理器，还可以包括存储器，用于实现上述方法中V2X终端的功能。该芯片系统可以由芯片构成，也可以包含芯片和其他分立器件。
第十五方面，本申请实施例提供了一种芯片系统，该芯片系统包括处理器，还可以包括存储器，用于实现上述方法中接入网设备的功能。该芯片系统可以由芯片构成，也可以包含芯片和其他分立器件。
第十六方面，提供了一种通信系统，该通信系统中包括第一通信装置和第二通信装置，该第一通信装置可以实现第一方面或第四方面的方法或第一方面或第四方面的任一种可能的实现的方法，该第二通信装置可以实现第二方面的方法或第二方面的任一种可能的实现的方法。例如，第一通信装置为核心网设备，第二通信装置为V2X终端。
第十七方面，提供了一种通信系统，该通信系统中包括第三通信装置和第四通信装置，该第三通信装置可以实现第一方面或第四方面的方法或第一方面或第四方面的任一种可能的实现的方法，该第四通信装置可以实现第三方面的方法或第三方面的任一种可能的实现的方法。例如，第三通信装置为核心网设备，第四通信装置为接入网设备。
第十八方面，提供一种通信系统，该通信系统包括V2X终端、核心网设备。其中，V2X终端用于，当V2X终端采用基站调度模式的PC5接口通信传输V2X业务数据时，或者，当V2X终端采用当前驻留小区控制的频谱传输V2X业务数据时，向所述核心网设备发送指示信息，指示信息用于指示在V2X终端完成注册后保持或不释放核心网设备与V2X终端之间的信令连接，或者，指示信息用于指示在V2X终端完成注册后保持或不释放V2X终端在核心网设备与V2X终端的接入网设备之间的通信连接；核心网设备用于，获取指示信息，根据指示信息，保持或不释放V2X终端在核心网设备与V2X终端的接入网设备之间的通信连接；V2X终端还用于，向V2X终端的接入网设备发送资源请求消息，该资源请求消息用于向接入网设备请求PC5接口通信资源，PC5接口通信资源用于传输V2X业务数据。
第十九方面，提供一种通信系统，该通信系统包括接入网设备及核心网设备。其中，接入网设备用于，接收来自V2X终端的资源请求消息，该资源请求消息用于请求为V2X终端分配PC5接口通信资源；接入网设备还用于，根据资源请求消息，向核心网设备发送指示信息，指示信息用于指示在V2X终端完成注册后保持或不释放核心网设备与V2X终端之间的信令连接，或者，指示信息用于指示在V2X终端完成注册后保持或不释放V2X终端在核心网设备与V2X终端的接入网设备之间的通信连接；核心网设备用于，获取指示信息，根据指示信息，保持或不释放V2X终端在核心网设备与V2X终端的接入网设备之间的通信连接。
第二十方面，提供一种通信系统，该通信系统包括V2X终端、核心网设备。其中， V2X终端用于，向核心网设备发送用于指示V2X终端支持PC5接口通信的能力信息；核心网设备用于，接收该能力信息，并根据能力信息在V2X终端完成注册后保持或不释放V2X终端与核心网设备之间的信令连接。
需要说明的是，第十二方面提供的通信系统中的核心网设备，用于执行上述第四方面提供的通信方法，期具体实现可以参考上述第四方面的具体实现。
上述第五方面至第二十方面提供的方案，用于实现上述第一方面至第四方面提供的通信方法，因此可以与第一方面至第四方面达到相同的有益效果，此处不再进行赘述。
附图说明
图1为本申请实施例提供的一种通信系统架构的简化示意图；
图2为本申请实施例提供的一种通信方法的流程图；
图3为本申请实施例提供的一种通信装置的组成示意图；
图4为本申请实施例提供的一种通信方法的流程图；
图5为本申请实施例提供的另一种通信方法的流程图；
图6为本申请实施例提供的再一种通信方法的流程图；
图6a为本申请实施例提供的再一种通信方法的流程图；
图7为本申请实施例提供的另一种通信装置的组成示意图；
图8为本申请实施例提供的再一种通信装置的组成示意图；
图9为本申请实施例提供的再一种通信装置的组成示意图；
图10为本申请实施例提供的再一种通信装置的组成示意图；
图11为本申请实施例提供的再一种通信装置的组成示意图；
图12为本申请实施例提供的再一种通信装置的组成示意图；
图13为本申请实施例提供的再一种通信方法的流程图；
图14为本申请实施例提供的再一种通信方法的流程图；
图15为本申请实施例提供的再一种通信方法的流程图；
图16为本申请实施例提供的再一种通信方法的流程图。
具体实施方式
在本申请实施例中，为了便于清楚描述本申请实施例的技术方案，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。该“第一”、第二”描述的技术特征间无先后顺序或者大小顺序。
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。
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。
在本申请实施例中，至少一个还可以描述为一个或多个，多个可以是两个、三个、四个或者更多个，本申请不做限制。
此外，本申请实施例描述的网络架构以及场景是为了更加清楚的说明本申请实施例的技术方案，并不构成对于本申请实施例提供的技术方案的限定，本领域普通技术人员可知，随着网络架构的演变和新业务场景的出现，本申请实施例提供的技术方案对于类似的技术问题，同样适用。
本申请实施例提供的方法可用于支持V2X业务数据传输的任一通信系统，该通信系统可以为第三代合作伙伴计划(3rd generation partnership project，3GPP)通信系统，例如，长期演进(long term evolution，LTE)系统，又可以为第五代(5th generation，5G)移动通信系统或者新空口(new radio，NR)系统，也可以为非3GPP通信系统，不予限制。
如图1所示，提供了一种通信系统的架构图，该通信系统可以包括终端、接入网设备、核心网设备、数据网络(data network，DN)等。参见图1，核心网设备可以包括接入和AMF、策略控制功能(policy control function，PCF)、统一数据管理(unified data management，UDM)、会话管理功能(session management function，SMF)、用户面功能(user plane function，UPF)。下面结合图1，对本申请所涉及的装置进行介绍。
终端，可以称为用户设备(user equipment，UE)或者终端设备(terminal)。该终端可以支持V2X通信，如：接收或发送V2X消息，此时，该终端又可以称之为V2X终端。其中，V2X消息可以包括但不限于车辆对车辆(vehicle to vehicle，V2V)消息、车对人(vehicle to person，V2P)消息、车对网络(vehicle to network，V2N)消息、车与路面基础设施(vehicle to infrastructure，V2I)信息、车与车之间的防碰撞消息、娱乐应用消息、车与车之间交互的导航消息等。显然，图1所示终端可以包括但不限于车载终端、手机(mobile phone)、平板电脑或带无线收发功能的电脑、智能加油站、智能信号灯等等。
本申请实施例中，终端可以通过不同类型的通信接口传输V2X消息。其中，通信接口可以包括PC5口和/或Uu口。
接入网设备，负责无线资源管理，上下行数据分类和QoS应用，以及与控制面网元完成信令处理，与用户面网元完成数据转发等功能。例如，接入网设备可以是基站，宽带网络业务网关(broadband network gateway，BNG)，汇聚交换机，非3GPP接入设备等。基站可以包括各种形式的基站，例如：宏基站，微基站(也称为小站)，中继站，接入点等，本申请实施例对此不作具体限定。对于终端接入核心网的设备，在文中统一称之为接入网设备，不再进行说明。例如，接入网设备可以是4G网络中的演进型通用陆地无线接入网(evolved universal terrestrial radio access network， E-UTRAN)设备、5G网络中的下一代无线接入网(next generation radio access network，NG-RAN)设备等。
AMF，其主要功能包括无线接入网络控制平面的终结点，非接入信令的终结点，移动性管理，合法监听，接入授权\鉴权等等。
SMF，用于会话管理，终端的网络互连协议(Internet Protocol，IP)地址分配和管理，选择可管理用户平面功能，策略控制和收费功能接口的终结点，下行数据通知等。
UPF，用于分组路由和转发，用户面数据的服务质量(quality of service，QoS)处理等。DN为用于传输数据的网络，例如Internet网络等。
PCF，用于向终端，AMF，或SMF分别提供UE Policy，接入和移动性(access and mobility，AM)Policy以及会话管理(session management，SM)Policy相关的参数。在V2X的场景中，PCF向终端，接入网设备提供V2X相关的鉴权和策略参数等信息。
UDM，用于管理签约信息，并向相关网元提供签约信息等。
需要说明的是，除RAN之外的运营商网元构成的网络可以成为核心网，在4G网络中，其包括MME，S-GW，P-GW，HSS等网元，在5G网络中，其包括AMF，SMF，UPF，UDM，PCF等网元。
图1中的Uu接口是终端和接入网设备之间的无线连接接口。N2接口为接入网设备和核心网设备(AMF)的参考点，用于NAS消息的发送，还可能包括传输接入网配置的相关信息等，因此接入网设备和核心网设备之间的通信连接可以称之为N2连接。PC5接口为终端之间用于V2X业务的用户面ProSe直接通信的参考点。
需要指出的是，本申请实施例所应用的网络架构不限定图1所示的网络架构。此外，图1所示网络架构仅为示例性架构图，通信系统包括的网元的数量以及网元名称均不做限定。例如，除图1所示网络功能实体外，图1所示网络还可以包括其他功能实体。再例如，上述图1架构中的网元、各个网元之间的接口名字以及各个协议层的命名只是一个示例，具体实现中网元、网元之间的接口名字以及协议层可以为其他名字，本申请实施例对此不作具体限定。
本申请实施例提供的方案可以应用于无线通信系统中终端向网络注册过程以及注册完成后各个网元的交互过程，在描述本申请的具体方案之前，此处先对无线通信系统中终端向网络注册过程以及注册后各个网元的交互过程进行简单描述。
在无线通信系统中，终端可以在初始接入网络，或者，定期注册，或者，移动性导致的注册等多种场景下向网络发送注册请求，本申请实施例对此不进行具体限定。以5G通信系统为例，描述终端的注册流程以及注册完成后各个网元的交互过程，如图2示意，该过程可以包括：
S201、终端向AMF发送注册请求消息。
其中，注册请求消息为NAS消息，注册请求消息携带终端的标识。终端的标识用于唯一指示该终端，本申请对于标识信息的内容不进行具体限定。
进一步的，注册请求消息中还可以包括终端的能力信息，该能力信息用于表示终端所具备的能力。
具体的，注册请求消息通过RAN发送至AMF。
S202、AMF根据终端的标识，从UDM处获取该终端的签约信息。
其中，在S202中，核心网设备根据终端的标识，从UDM处获取该终端的签约信息可以具体实现为：核心网设备根据终端的标识以及终端的其他信息从UDM获取终端的签约信息。该其他信息可以为终端的能力信息或者其他，本申请实施例对此不进行具体限定。
S203、AMF选择PCF，并建立AMF-PCF的关联关系。
在S203中，核心网设备可以根据终端的签约信息选择对应的PCF。在S203中，核心网设备还可以将终端关于策略的请求信息发送至PCF，用于PCF更新该终端的策略。例如，核心网设备可以将终端已获知的策略(policy)携带在终端的策略容器(policy container)中发送至PCF。需要说明的是，S203的具体实现可以参考标准3GPP TS 23.502以及3GPP TS 23.503，本申请实施例对此不再进行赘述。
S204、核心网设备向终端发送注册接受消息(registration accept message)。
其中，注册接受请求是一个NAS消息，核心网设备发送的注册接受消息，会通过在下一代应用协议(next generation application protocol，NGAP)接口承载的终端上下文建立请求(UE context setup request)发送至接入网设备，由接入网设备通过RRC连接重配置(RRC connection reconfiguration)消息将注册接受请求发送到终端。
至此，终端完成了注册，建立了AMF与RAN之间的N2连接，RAN与终端间的RRC连接，以及AMF和终端间的N1连接，RAN中保存了终端的上下文，终端进入了连接态。
在终端完成注册后，如图1所示，各个网元的交互过程包括：
S205、AMF判断终端是否有数据或信令传输需求。
在S205中，若AMF判断终端有数据或信令传输需求，则保持AMF与RAN之间的N2连接以及RAN与终端间的N1连接，进行后续通信过程。若AMF判断终端没有数据或信令传输需求，则执行S206。
具体的，在S205中，AMF如何判断终端是否有数据或信令传输需求可以根据实际需求配置，本申请实施例对此不进行具体限定。
例如，当终端在注册完成后还有待处理的上行信令时，终端的注册请求中会携带还需再发送NAS消息的指示(例如follow-on request)，此时AMF可以判断终端有信令传输需求。其中，终端注册后发送的NAS消息可以包括用于建立PDU会话或者激活PDU会话的NAS消息。
再例如，若终端在此前已经注册至网络，并且已经建立了相应的PDU会话，由于定期注册或者移动性导致的注册中，终端在idle状态发起的S201中的注册请求，并且注册请求包含激活会话的信元(PDU session to-be-activated的IE)，此时AMF可以判断终端数据传输需求。
S206、AMF启动用于释放N2连接的定时器。
其中，用于释放N2连接的定时器可以为T3540定时器，T3540定时器时长可以为10秒。在T3540定时器超时之后，执行S206。
S206、AMF向RAN发送用于释放N2连接的NGAP消息。
S207、RAN接收用于释放N2连接的NGAP消息。
S208、RAN启动用于释放N2连接的定时器。
其中，用于释放N2连接的定时器可以为Inactivity timer定时器。若在Inactivity timer定时器运行过程中，RAN接收到终端的数据传输需求，则拒绝释放N2连接；若在Inactivity timer定时器超时后，RAN未接收到终端的数据传输需求，则执行S209释放N2连接。
S209、释放N2连接。
释放N2连接的具体过程可以包括：RAN删除保存的终端的上下文，RAN向终端发送用于释放N1连接的消息，RAN响应AMF的用于释放N2连接的NGAP消息等。在执行S208之后，AMF与RAN之间的N2连接以及RAN与终端间的RRC连接均释放，RAN中保存了终端的上下文删除，终端进入了空闲态。
下面将结合附图对本申请实施例的实施方式进行详细描述。需要指出的是，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作具体限定。
图3为本申请实施例提供的一种通信装置30的组成示意图，如图3所示，该通信装置30可以包括至少一个处理器31，存储器32、通信接口33、通信总线34。下面结合图3对通信装置30的各个构成部件进行具体的介绍：
处理器31，可以是一个处理器，也可以是多个处理元件的统称。例如，处理器31是一个中央处理器(central processing unit，CPU)，也可以是特定集成电路(application specific integrated circuit，ASIC)，或者是被配置成实施本申请实施例的一个或多个集成电路，例如：一个或多个微处理器(digital signal processor，DSP)，或，一个或者多个现场可编程门阵列(field programmable gate array，FPGA)。
其中，处理器31可以通过运行或执行存储在存储器32内的软件程序，以及调用存储在存储器32内的数据，执行功能别名控制服务器的各种功能。在具体的实现中，作为一种实施例，处理器31可以包括一个或多个CPU，例如图3中所示的CPU0和CPU1。
在具体实现中，作为一种实施例，该通信装置30可以包括多个处理器，例如图3中所示的处理器31和处理器35。这些处理器中的每一个可以是一个单核处理器(single-CPU)，也可以是一个多核处理器(multi-CPU)。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。
存储器32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32可以是独立存在，通过通信总线34与处理器31相连接。存储器32也可以和处理器31集成在一起。其中，存储器32用于存储执行本申请方案的软件程序，并由处理器31来控制执行。
通信接口33，使用任何收发器一类的装置，用于与其他设备或通信网络通信，如以太网，无线接入网(radio access network，RAN)，无线局域网(wireless local area networks，WLAN)等。通信接口33可以包括接收单元以及发送单元。
通信总线34，可以是工业标准体系结构(industry standard architecture，ISA)总线、外部设备互连(peripheral component，PCI)总线或扩展工业标准体系结构(extended industry standard architecture，EISA)总线等。该总线可以分为地址总线、数据总线、控制总线等。为便于表示，图3中仅用一条粗线表示，但并不表示仅有一根总线或一种类型的总线。
需要指出的是，图3中示出的部件并不构成对该通信装置的限定，除图3所示部件之外，该通信装置可以包括比图示更多或更少的部件，或者组合某些部件，或者不同的部件布置。
一种可能的实现中，处理器31通过运行或执行存储在存储器32内的软件程序和/或模块，以及调用存储在存储器32内的数据，执行如下功能：
获取指示信息，该指示信息用于指示在V2X终端完成注册后保持或不释放核心网设备与该V2X终端之间的信令连接，或者，该指示信息用于指示在V2X终端完成注册后保持或不释放该V2X终端在核心网设备与V2X终端的接入网设备之间的通信连接；根据获取的指示信息，保持或不释放V2X终端在核心网设备与V2X终端的接入网设备之间的通信连接。
另一种可能的实现中，处理器31通过运行或执行存储在存储器32内的软件程序和/或模块，以及调用存储在存储器32内的数据，执行如下功能：
当通信装置30所属的V2X终端采用基站调度模式的PC5接口通信传输V2X业务数据时，或者，当通信装置30所属的V2X终端采用当前驻留小区控制的频谱传输V2X业务数据时，向核心网设备发送指示信息，该指示信息用于指示在V2X终端完成注册后保持或不释放核心网设备与V2X终端之间的信令连接，或者，该指示信息用于指示在V2X终端完成注册后保持或不释放V2X终端在核心网设备与V2X终端的接入网设备之间的通信连接；向接入网设备发送资源请求消息，该资源请求消息用于向接入网设备请求PC5接口通信资源，PC5接口通信资源用于传输V2X业务数据。
再一种可能的实现中，处理器31通过运行或执行存储在存储器32内的软件程序和/或模块，以及调用存储在存储器32内的数据，执行如下功能：
接收来自V2X终端的资源请求消息，该资源请求消息用于请求为该V2X终端分配PC5接口通信资源；根据资源请求消息，向核心网设备发送指示信息，该指示信息用于指示在V2X终端完成注册后保持或不释放所心网设备与V2X终端之间的信令连接，或者，该指示信息用于指示在V2X终端完成注册后保持或不释放V2X终端在核心网设备与该V2X终端的接入网设备之间的通信连接。
一方面，本申请实施例提供一种通信方法，应用于V2X终端、接入网设备以及核心网设备的交互过程中。图4为本申请实施例提供的一种通信方法的流程图，如图4所示，该方法可以包括：
S401、当V2X终端采用基站调度模式的PC5接口通信传输V2X业务数据时，或者，当V2X终端采用当前驻留小区控制的频谱传输V2X业务数据时，V2X终端向核 心网设备发送指示信息。
其中，采用基站调度模式的PC5接口通信传输V2X业务数据，或者，采用当前驻留小区控制的频谱传输V2X业务数据，可以称之为模式1(mode1)PC5接口通信，其本质可以指的是由接入网设备分配用于传输V2X业务数据的资源，该资源可以用于发送端和接收端之间直接通信，接入网设备无需对该V2X业务数据进行转发。
应理解，在实际应用中，S401也可以替换为：当V2X终端处于业务数据无需在接入网设备中转传输但需接入网设备分配传输V2X业务数据的资源的场景时，V2X终端向核心网设备发送指示信息。
例如，在S401中，V2X终端可以根据用户在V2X应用中操作产生的应用层数据，该应用层数据可以是V2X业务数据。结合V2X终端内配置的策略，确定采用基站调度模式的PC5接口通信方式传输V2X业务数据时，或者，V2X终端采用当前驻留小区控制的频谱传输V2X业务数据。
当然，在实际应用中，可以根据实际需求配置确定传输V2X业务数据的方式，本申请实施例不进行具体限定。
其中，指示信息可以用于指示在V2X终端完成注册后保持或不释放核心网设备与V2X终端之间的信令连接。或者，指示信息可以用于指示在V2X终端完成注册后保持或不释放V2X终端在核心网设备与V2X终端的接入网设备之间的通信连接，该通信连接可以是N2连接。
示例性的，在无线通信中终端向网络发起注册，通过注册流程，建立了核心网设备与终端之间的信令连接(例如，5G中的N1连接)、终端在核心网设备与该终端的接入网设备之间的通信连接(例如，5G中的N2连接)以及终端与接入网设备之间的连接(例如，5G中的RRC连接)，并且使得终端进入了连接态。在终端完成注册之后，核心网设备若判断终端没有数据或信令传输的需求，核心网设备通过向接入网设备发送连接释放请求消息，以实现释放核心网设备与终端之间的信令连接、释放该终端在核心网设备与该终端的接入网设备之间的通信连接、以及释放终端与接入网设备之间的连接，同时接入网设备删除内部保存的终端的上下文，这时候终端进入了空闲态。
可见，释放核心网设备与终端之间的信令连接、释放终端在核心网设备与该终端的接入网设备之间的通信连接、释放终端与接入网设备之间的连接、接入网设备删除内部保存的终端的上下文、终端进入空闲态，是相互等价的概念，可以相互替换。
换言之，保持或不释放核心网设备与终端之间的信令连接、保持或不释放终端在核心网设备与该终端的接入网设备之间的通信连接、保持或不释放终端与接入网设备之间的连接、接入网设备保留内部保存的终端的上下文、终端保持连接态，是相互等价的概念，可以相互替换。
因此，本申请中描述的指示信息，除了上述用于指示在V2X终端完成注册后保持或不释放核心网设备与该V2X终端之间的信令连接，或者，该指示信息用于指示在V2X终端完成注册后保持或不释放该V2X终端在核心网设备与V2X终端的接入网设备之间的通信连接之外，指示信息还可以用于指示在V2X终端完成注册后保持或不释放接入网设备与该V2X终端之间的连接；或者，指示信息还可以用于指示在V2X终 端完成注册后接入网设备保留内部保存的终端的上下文，或者，指示信息还可以用于指示在V2X终端完成注册后V2X终端保持连接态。
需要说明的是，对于指示信息的具体内容，可以根据实际需求配置，本申请实施例对此不进行具体限定。
示例性的，本申请实施例提供如下两种指示信息可能的实现方式：
方式1、指示信息可以为隐式的指示。
例如，指示信息可以包括以下一种或多种：V2X终端的类型，第一指示，和用于指示V2X终端支持PC5接口通信的能力信息。
其中，第一指示用于指示V2X终端存在待处理的上行信令。存在待处理的上行信令，可以替换为：存在待处理的第一服务请求(service request)之外的其他上行非接入层(non-access stratum，NAS)消息，第一服务请求用于激活用户面资源；或者，存在待处理的第二服务请求，第二服务请求用于不激活用户面资源。
例如，第一指示可以为follow-on request的标识。
方式2、指示信息为显式的指示。
例如，指示信息可以为请求保持或不释放核心网设备与终端之间的信令连接、或者请求保持或不释放终端在核心网设备与该终端的接入网设备之间的通信连接、或者请求保持或不释放终端与接入网设备之间的连接、或者请求接入网设备保留内部保存的终端的上下文、或者请求终端保持连接态的显式信元。
具体的，在S401中，V2X终端向核心网设备发送指示信息，可以通过但不限于下述两种方式实现：
实现方式A、V2X终端向核心网设备发送注册请求消息，注册请求消息携带指示信息。
其中，该注册请求消息在S201中的注册请求消息的基础上，携带了指示信息。
实现方式B、V2X终端向核心网设备发送独立的指示信息。
在实现方式B中，S401的执行时机可根据实际需求选择，本申请实施例不进行具体限定。例如，S401可以在V2X终端注册的过程中执行，或者，也可以在V2X终端注册完成后执行。
需要说明的是，S401中V2X终端向核心网设备发送指示信息，是通过接入网设备向核心网设备发送的，对于该过程中接入网设备的处理逻辑本申请不进行赘述。
S402、核心网设备获取指示信息。
其中，对于指示信息的功能已经在S401中进行了详细描述，此处不再进行赘述。
其中，S402中核心网设备获取的指示信息可以包括以下一种或多种：V2X终端的类型，第一指示，和用于指示V2X终端支持PC5接口通信的能力信息。或者，S402中核心网设备获取的指示信息可以包括以下一种或多种：V2X终端的类型，S401中方式2中的显示指示，和用于指示V2X终端支持PC5接口通信的能力信息。
一种可能的实现中，S402中核心网设备获取的指示信息即S401中V2X终端发送的指示信息。在该实现中，S402中核心网设备直接接收来自V2X的指示信息即可。
对应于S401中的实现方式A和实现方式B，S402中核心网设备接收来自V2X终端的指示信息具体可以实现为：核心网设备接收来自V2X终端的注册请求消息，该注 册请求消息携带指示信息；或者，核心网设备接收来自V2X终端发送的独立的指示信息。
另一种可能的实现中，S402中核心网设备获取的指示信息中的V2X终端的类型、用于指示V2X终端支持PC5接口通信的能力信息为该V2X终端的签约信息中的内容。在该实现方式中，S402中核心网设备获取指示信息具体可以实现为：核心网设备接收来自V2X终端的指示信息，并且向签约信息管理网元请求V2X终端的签约信息以获取指示信息中的V2X终端的类型和/或用于指示V2X终端支持PC5接口通信的能力信息。
S403、核心网设备根据指示信息，保持或不释放V2X终端在核心网设备与V2X终端的接入网设备之间的通信连接。
一种可能的实现中，S403中核心网设备根据指示信息，保持或不释放V2X终端在核心网设备与V2X终端的接入网设备之间的通信连接，具体可以实现为：核心网设备根据指示信息，在V2X终端完成注册后(即向V2X终端发送注册接受消息后)，不向接入网设备发送连接释放请求消息。
其中，该连接释放请求消息用于释放V2X终端在核心网设备与该V2X终端的接入网设备之间的通信连接。例如，该连接释放请求消息可以为5G系统中的N2连接释放请求。
需要说明的是，步骤S403可以替换为：核心网设备根据指示信息，不向接入网设备发送连接释放请求消息。具体的，核心网设备根据指示信息，在V2X终端完成注册后(即向V2X终端发送注册接受消息后)，不向接入网设备发送连接释放请求消息。
另一种可能的实现中，S403中核心网设备根据指示信息，保持或不释放V2X终端在核心网设备与V2X终端的接入网设备之间的通信连接，具体可以实现为：核心网设备根据指示信息，在V2X终端完成注册后(即向V2X终端发送注册接受消息后)，不启动向接入网设备发送连接释放请求消息的定时器。
需要说明的是，步骤S403可以替换为：核心网设备根据指示信息，不启动向接入网设备发送连接释放请求消息的定时器。具体的，核心网设备根据指示信息，在V2X终端完成注册后(即向V2X终端发送注册接受消息后)，不启动向接入网设备发送连接释放请求消息的定时器。
通过上述S401至S403的过程，实现了接入网设备中保留V2X终端的上下文，使得V2X终端保持连接态，V2X终端则可以通过S404至S406的过程进行PC5接口通信。
S404、V2X终端向V2X终端的接入网设备发送资源请求消息。
其中，该资源请求消息用于向接入网设备请求PC5接口通信资源，PC5接口通信资源用于传输V2X业务数据。
S405、接入网设备接收来自V2X终端的资源请求消息。
S406、接入网设备根据资源请求消息和V2X终端的上下文，为V2X终端分配资源。
通过本申请提供的通信方法，核心网设备根据V2X终端提供的指示信息，保持或不释放V2X终端在核心网设备与V2X终端的接入网设备之间的通信连接，这样一来， V2X终端注册阶段接入网设备保存的该V2X终端的上下文得以保留，以支持接入网设备依据V2X终端的上下文为V2X终端分配PC5接口的资源，保证了V2X终端实现PC5接口通信。
可选的，若S401中V2X终端将指示信息携带在注册请求消息中发送，如图4所示，本申请实施例提供的通信方法在S402之后S403之前还可以包括S407，完成V2X终端的注册过程。
S407、核心网设备向V2X终端发送注册接受消息。
一种可能的实现中，S407可以参照S204的具体实现，此处不再赘述。
另一种可能的实现中，S407具体实现为S407a至S407c。
S407a、核心网设备向接入网设备发送NGAP消息。
其中，该NGAP消息包括注册接受消息以及第二指示。其中，第二指示用于指示接入网设备保持或不释放V2X终端在核心网设备与V2X终端的接入网设备之间的通信连接。
S407b、接入网设备根据第二指示，设置第一时长。
其中，第一时长为在收到第二指示后检测V2X终端没有数据传输释放V2X终端在核心网设备与V2X终端的接入网设备之间的通信连接的时长，第一时长小于第二时长。第二时长为接入网设备中设置的用于检测V2X终端没有数据传输而释放释放V2X终端在核心网设备与V2X终端的接入网设备之间的通信连接的时长。例如，第二时长为Inactivity timer定时器时长。
具体的，若第一时长到期，V2X终端没有数据传输，则接入网设备主动发起释放V2X终端在核心网设备与V2X终端的接入网设备之间的通信连接。
S407c、接入网设备向V2X终端发送RRC消息，该RRC消息携带注册接受消息。
可选的，若S401中V2X终端发送的指示信息包括第一指示，如图4所示，本申请实施例提供的通信方法还可以包括S408和S409。
S408、V2X终端在接收到注册接受消息后，向核心网设备发送NAS消息。
其中，S408中V2X终端发送的NAS消息包括服务请求消息，该服务请求消息用于请求不激活用户面资源。
例如，不激活用户面资源的服务请求用于保持V2X终端处于连接态，或者用于保持N2连接，或不释放N2连接。例如，不激活用户面资源不携带PDU session to be activated信元，即UE不会进一步激活用户面资源。
S409、核心网设备接收NAS消息。
在S409中，核心网设备执行标准3GPP TS 23.502中的Service Request的流程，过程如同V2X终端从空闲态转换成连接态时的过程，此处不再赘述。
另一方面，本申请实施例提供另一种通信方法，可以应用于V2X终端采用图2中示意的注册过程完成注册之后，V2X终端、接入网设备以及核心网设备的交互过程中。图5为本申请实施例提供的一种通信方法的流程图，如图5所示，该方法可以包括：
S501、V2X终端向V2X终端的接入网设备发送资源请求消息。
其中，资源请求消息用于向接入网设备请求PC5接口通信资源，PC5接口通信资源用于传输V2X业务数据。
S502、接入网设备接收来自V2X终端的资源请求消息。
具体的，S502中接入网设备接收到来自V2X终端的资源请求信息，则说明V2X终端存在正在进行了模式1的PC5接口通信。
S503、接入网设备根据资源请求消息，向核心网设备发送指示信息。
其中，指示信息可以用于指示在V2X终端完成注册后保持或不释放核心网设备与V2X终端之间的信令连接，或者，指示信息用于指示在V2X终端完成注册后保持或不释放V2X终端在核心网设备与V2X终端的接入网设备之间的通信连接。
如前所述，本申请中描述的指示信息，除了上述用于指示在V2X终端完成注册后保持或不释放核心网设备与该V2X终端之间的信令连接，或者，该指示信息用于指示在V2X终端完成注册后保持或不释放该V2X终端在核心网设备与V2X终端的接入网设备之间的通信连接之外，指示信息还可以用于指示在V2X终端完成注册后保持或不释放接入网设备与该V2X终端之间的连接；或者，指示信息还可以用于指示在V2X终端完成注册后接入网设备保留内部保存的终端的上下文，或者，指示信息还可以用于指示在V2X终端完成注册后V2X终端保持连接态。
需要说明的是，对于指示信息的具体内容，可以根据实际需求配置，本申请实施例对此不进行具体限定。
示例性的，本申请实施例提供如下两种指示信息可能的实现：
实现a、指示信息为显式的指示。
例如，指示信息可以为请求保持或不释放核心网设备与终端之间的信令连接、或者请求保持或不释放终端在核心网设备与该终端的接入网设备之间的通信连接、或者请求保持或不释放终端与接入网设备之间的连接、或者请求接入网设备保留内部保存的终端的上下文、或者请求终端保持连接态的显式信元。
实现b、指示信息可以为隐式的指示。
例如，指示信息可以包括：用于指示V2X终端正在进行PC5接口通信的信息，或者，用于指示接入网设备支持PC5通信的能力信息。
例如，指示信息可以包括连接释放请求消息的拒绝消息。其中，连接释放请求消息用于释放V2X终端在核心网设备与所述接入网设备之间的通信连接。
示例性的，连接释放请求消息可以为5G系统中的N2连接释放消息。
进一步的，当指示信息包括连接释放请求消息的拒绝消息时，如图5所示，本申请实施例提供的通信方法在S503之前还可以包括S503a和S503b。
S503a、核心网设备向接入网设备发送连接释放请求消息。
需要说明的时，S503a的具体实现可以参照S206和S207，此处不再进行赘述。
S503b、接入网设备接收来自核心网设备的连接释放请求消息。
进一步的，当指示信息包括连接释放请求消息的拒绝消息时，S503具体可以实现为：接入网设备根据资源请求消息和连接释放请求消息，向核心网设备发送连接释放请求消息的拒绝消息。
一种可能的实现中，接入网设备根据资源请求消息和连接释放请求消息，向核心网设备发送拒绝消息，可以实现为：接入网设备在接收到资源请求消息时，启动定时器；若接入网设备在接收到连接释放请求消息时定时器未超时，则接入网设备向核心 网设备发送连接释放请求消息的拒绝消息。
S504、核心网设备获取指示信息。
具体的，S504中，核心网设备获取指示信息可以实现为：核心网设备接收来自接入网设备的指示信息。
需要说明的是，S504中核心网设备获取的指示信息，即S503中接入网设备发送的指示信息，此处不再进行赘述。
S505、核心网设备根据指示信息，保持或不释放V2X终端在核心网设备与V2X终端的接入网设备之间的通信连接。
需要说明的是，S505的具体实现可以参照S403的具体实现，此处不再进行赘述。
S506、接入网设备根据V2X终端的上下文为V2X终端分配资源。
通过本申请提供的通信方法，当接入网设备接收来自V2X终端的资源请求消息时接入网设备确定V2X终端存在需接入网设备分配资源的PC5接口通信需求，接入网设备向核心网设备发送指示信息，以使得核心网设备根据指示信息保持或不释放V2X终端在核心网设备与V2X终端的接入网设备之间的通信连接，这样一来，V2X终端注册阶段接入网设备保存的该V2X终端的上下文得以保留，以支持接入网设备依据V2X终端的上下文为V2X终端分配PC5接口的资源，保证了V2X终端实现PC5接口通信。
再一方面，本申请实施例提供再一种通信方法，应用于V2X终端、接入网设备以及核心网设备的交互过程中。图6本申请实施例提供的一种通信方法的流程图，如图6所示，该方法可以包括：
S601、核心网设备获取指示信息。
其中，指示信息可以用于指示在V2X终端完成注册后保持或不释放核心网设备与V2X终端之间的信令连接，或者，指示信息用于指示在V2X终端完成注册后保持或不释放V2X终端在核心网设备与V2X终端的接入网设备之间的通信连接。
需要说明的是，对于指示信息的功能已经在S401中进行了详细描述，此处不再进行赘述。
需要说明的是，对于指示信息的具体内容，可以根据实际需求配置，本申请实施例对此不进行具体限定。
示例性的，本申请实施例提供如下两种指示信息可能的实现：
一种可能的实现中，指示信息包括以下一种或多种：V2X终端的类型，和V2X终端支持PC5接口通信的能力信息。S601具体可以实现为：核心网设备从V2X终端的签约信息获取指示信息。
另一种可能的实现中，指示信息可以包括：用于指示接入网设备支持PC5通信的能力信息。S601具体可以实现为：核心网设备与接入网设备进行设备级交互时，接收来自接入网设备的指示信息。
再一种可能的实现中，指示信息包括以下一种或多种：V2X终端的类型，V2X终端支持PC5接口通信的能力信息，和用于指示接入网设备支持PC5通信的能力信息。
S602、核心网设备根据指示信息，保持或不释放V2X终端在核心网设备与V2X终端的接入网设备之间的通信连接。
需要说明的是，S602的具体实现可以参照S403的具体实现，此处不再进行赘述。
通过本申请提供的通信方法，核心网设备根据指示信息保持或不释放V2X终端在核心网设备与V2X终端的接入网设备之间的通信连接，这样一来，V2X终端注册阶段接入网设备保存的该V2X终端的上下文得以保留，以支持接入网设备依据V2X终端的上下文为V2X终端分配PC5接口的资源，保证了V2X终端实现PC5接口通信。
再一方面，本申请实施例提供再一种通信方法，应用于V2X终端、接入网设备以及核心网设备的交互过程中。图6a本申请实施例提供的一种通信方法的流程图，如图6a所示，该方法可以包括：
S701、核心网设备获取用于指示V2X终端支持PC5接口通信的能力信息。
其中，该核心网设备可以为AMF。
一种可能的实现方式中，S701中核心网设备可以接收来自V2X终端的该能力信息。
示例性的，该能力信息可以为前述实施例中的指示信息的一种实现形式，V2X终端可以参考S401的描述发送该能力信息，此处不再赘述。
一种可能的实现方式中，能力信息可以携带在注册请求消息中。
例如，该注册请求消息在S201中的注册请求消息的基础上，携带了上述能力信息。
S702、核心网设备根据能力信息，在V2X终端完成注册后保持或不释放V2X终端与核心网设备之间的信令连接。
一种可能的实现中，S702中核心网设备根据能力信息，在V2X终端完成注册后保持或不释放V2X终端与核心网设备之间的信令连接，具体可以实现为：核心网设备根据该能力信息，在V2X终端完成注册后不向接入网设备发送连接释放请求消息。
其中，该连接释放请求消息用于释放V2X终端与核心网设备之间的信令连接。例如，该连接释放请求消息可以为5G系统中的N2连接释放请求。
另一种可能的实现方式中，S702中核心网设备根据能力信息，在V2X终端完成注册后保持或不释放V2X终端与核心网设备之间的信令连接，具体可以实现为：核心网设备根据V2X终端的签约信息和该能力信息，在V2X终端完成注册后保持或不释放V2X终端与核心网设备之间的信令连接。
其中，核心网设备可以从UDM获取V2X终端的签约信息。该签约信息可以包括该V2X终端订阅的业务信息或者授权信息或者其他。
例如，S702中核心网设备可以从UDM获取V2X终端的签约信息，根据V2X终端的签约信息和该能力信息，确定该V2X终端被授权在PC5接口上进行V2X通信，核心网设备在V2X终端完成注册后保持或不释放V2X终端与核心网设备之间的信令连接。
需要说明的是，S702的实现也可以参照S403的具体实现，此处不再进行赘述。
通过本申请提供的通信方法，核心网设备根据指示V2X终端支持PC5接口通信的能力信息，在V2X终端完成注册后保持或不释放V2X终端与核心网设备之间的信令连接，这样一来，V2X终端注册阶段接入网设备保存的该V2X终端的上下文得以保留，以支持接入网设备依据V2X终端的上下文为V2X终端分配PC5接口的资源，保证了V2X终端实现PC5接口通信。
上述本申请提供的实施例中，分别从核心网设备、接入网设备、V2X终端之间交 互的角度对本申请实施例提供的方法进行了介绍。为了实现上述本申请实施例提供的方法中的各功能，核心网设备、接入网设备、V2X终端可以包括硬件结构和/或软件模块，以硬件结构、软件模块、或硬件结构加软件模块的形式来实现上述各功能。上述各功能中的某个功能以硬件结构、软件模块、还是硬件结构加软件模块的方式来执行，取决于技术方案的特定应用和设计约束条件。
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，另外，在本申请各个实施例中的各功能模块可以集成在一个处理器中，也可以是单独物理存在，也可以两个或两个以上模块集成在一个模块中。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。
在采用对应各个功能划分各个功能模块的情况下，如图7所示为本申请实施例提供的通信装置70，用于实现上述方法中核心网设备的功能。该通信装置70可以是核心网设备，也可以是核心网设备中的装置，也可以是能够和核心网设备匹配使用的装置。其中，该通信装置70可以为芯片系统。本申请实施例中，芯片系统可以由芯片构成，也可以包含芯片和其他分立器件。如图7所示，通信装置70可以包括：获取单元701、处理单元702。获取单元701用于执行图4中的S402、或者图5中的S504、或者图6中的S601、或者图6a中的S701，或者图13中的S1301，或者图14中的S1402，或者图15中的S1507，或者图16中的S1609；处理单元702用于执行图4中的S403、或者图5中的S505、或者图6中的S602、或者图6a中的S702，或者图13中的S1304，或者图14中的S1405，或者图15中的S1508，或者图16中的S1610。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。
进一步的，如图7所示，通信装置70还可以包括发送单元703，用于执行图5中的S503a，或者图13中的S1305，或者图14中的S1406，或者图15中的S1504，或者图16中的S1604、S1608。
如图8所示为本申请实施例提供的通信装置80，用于实现上述方法中核心网设备的功能。该通信装置80可以是核心网设备，也可以是核心网设备中的装置，也可以是能够和核心网设备匹配使用的装置。其中，该通信装置80可以为芯片系统。通信装置80包括至少一个处理模块801，用于实现本申请实施例提供的方法中核心网设备的功能。示例性地，处理模块801可以用于执行图4中的过程S402、S403，或者，图5中的过程S504、S505，或者，图6中的过程S601、S602，或者，图6a中的过程S701、S702，或者图13中的S1301、S1304，或者图14中的S1402、S1405，或者图15中的S1507、S1508，或者图16中的S1609、S1610。具体参见方法示例中的详细描述，此处不做赘述。
通信装置80还可以包括至少一个存储模块802，用于存储程序指令和/或数据。存储模块802和处理模块801耦合。本申请实施例中的耦合是装置、单元或模块之间的间接耦合或通信连接，可以是电性，机械或其它的形式，用于装置、单元或模块之间的信息交互。处理模块801可能和存储模块802协同操作。处理模块801可能执行存储模块802中存储的程序指令。所述至少一个存储模块中的至少一个可以包括于处理模块中。
通信装置80还可以包括通信模块803，用于通过传输介质和其它设备进行通信，从而用于确定通信装置80中的装置可以和其它设备进行通信。所述通信模块803用于该装置与其它设备进行通信。示例性的，处理模块801利用通信模块803执行图5中的过程S503a或者图13中的S1305，或者图14中的S1406，或者图15中的S1504，或者图16中的S1604、S1608。
当处理模块801为处理器，存储模块802为存储器，通信模块803为通信接口时，本申请实施例图8所涉及的通信装置80可以为图3所示的通信装置30。
如前述，本申请实施例提供的通信装置70或通信装置80可以用于实施上述本申请各实施例实现的方法中核心网设备的功能，为了便于说明，仅示出了与本申请实施例相关的部分，具体技术细节未揭示的，请参照本申请各实施例。
在采用对应各个功能划分各个功能模块的情况下，如图9所示为本申请实施例提供的通信装置90，用于实现上述方法中V2X终端的功能。该通信装置90可以是终端，也可以是V2X终端中的装置，也可以是能够和V2X终端匹配使用的装置。其中，该通信装置90可以为芯片系统。本申请实施例中，芯片系统可以由芯片构成，也可以包含芯片和其他分立器件。如图9所示，通信装置90可以包括：确定单元901和发送单元902。确定单元901用于确定V2X终端采用基站调度模式的PC5接口通信传输V2X业务数据时，或者，V2X终端采用当前驻留小区控制的频谱传输V2X业务数据；发送单元902用于执行图4中的过程S401、S404，或者图13中的S1301，或者图14中的S1402、S1407，或者图15中的S1501、S1506，或者图16中的S1601、S1606。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。
如图10所示为本申请实施例提供的通信装置100，用于实现上述方法中V2X终端的功能。该通信装置100可以是V2X终端，也可以是V2X终端中的装置，也可以是能够和V2X终端匹配使用的装置。其中，该通信装置100可以为芯片系统。本申请实施例中，芯片系统可以由芯片构成，也可以包含芯片和其他分立器件。通信装置100包括至少一个处理模块1001，用于实现本申请实施例提供的方法中V2X终端的功能。示例性地，处理模块1001可以用于用于确定V2X终端采用基站调度模式的PC5接口通信传输V2X业务数据时，或者，V2X终端采用当前驻留小区控制的频谱传输V2X业务数据，具体参见方法示例中的详细描述，此处不做赘述。
通信装置100还可以包括至少一个存储模块1002，用于存储程序指令和/或数据。存储模块1002和处理模块1001耦合。本申请实施例中的耦合是装置、单元或模块之间的间接耦合或通信连接，可以是电性，机械或其它的形式，用于装置、单元或模块之间的信息交互。处理模块1001可能和存储模块1002协同操作。处理模块1001可能执行存储模块1002中存储的程序指令。所述至少一个存储模块中的至少一个可以包括于处理模块中。
通信装置100还可以包括通信模块1003，用于通过传输介质和其它设备进行通信，从而用于通信装置100中的装置可以和其它设备进行通信。所述通信模块1003用于该装置与其它设备进行通信。示例性的，处理模块1001利用通信模块1003执行图4中的过程S401、S404，或者图13中的S1301，或者图14中的S1402、S1407，或者图 15中的S1501、S1506，或者图16中的S1601、S1606。
当处理模块1001为处理器，存储模块1002为存储器，通信模块1003为通信接口时，本申请实施例图10所涉及的通信装置100可以为图3所示的通信装置30。
如前述，本申请实施例提供的通信装置90或通信装置100，可以用于实施上述本申请各实施例实现的方法中V2X终端的功能，为了便于说明，仅示出了与本申请实施例相关的部分，具体技术细节未揭示的，请参照本申请各实施例。
在采用对应各个功能划分各个功能模块的情况下，如图11所示为本申请实施例提供的通信装置110，用于实现上述方法中接入网设备的功能。该通信装置110可以是接入网设备，也可以是接入网设备中的装置，也可以是能够和接入网设备匹配使用的装置。其中，该通信装置1100可以为芯片系统。本申请实施例中，芯片系统可以由芯片构成，也可以包含芯片和其他分立器件。如图11所示，通信装置110可以包括：接收单元1101、发送单元1102。接收单元1101用于执行图5中的S502、S503b，或者图15中的S1504、S1506，或者图16中的S1604、S1606、S1608；发送单元1102用于执行图5中的S503，或者图15中的S1505、S1507，或者图16中的S1605、S1609、S1612。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。
如图12所示为本申请实施例提供的通信装置120，用于实现上述方法中接入网设备的功能。该通信装置120可以是接入网设备，也可以是接入网设备中的装置，也可以是能够和接入网设备匹配使用的装置。其中，该通信装置120可以为芯片系统。通信装置120包括至少一个处理模块1201，用于实现本申请实施例提供的方法中接入网设备的功能，具体参见方法示例中的详细描述，此处不做赘述。
通信装置120还可以包括至少一个存储模块1202，用于存储程序指令和/或数据。存储模块1202和处理模块1201耦合。本申请实施例中的耦合是装置、单元或模块之间的间接耦合或通信连接，可以是电性，机械或其它的形式，用于装置、单元或模块之间的信息交互。处理模块1201可能和存储模块1202协同操作。处理模块1201可能执行存储模块1202中存储的程序指令。所述至少一个存储模块中的至少一个可以包括于处理模块中。
通信装置120还可以包括通信模块1203，用于通过传输介质和其它设备进行通信，从而用于确定通信装置120中的装置可以和其它设备进行通信。所述通信模块1203用于该装置与其它设备进行通信。示例性的，处理模块1201利用通信模块1203执行图5中的过程S502、S503、S503b，或者图15中的S1504、S1505、S1506、S1507，或者图16中的S1604、S1605、S1606、S1608、S1609、S1612。
当处理模块1201为处理器，存储模块1202为存储器，通信模块1203为通信接口时，本申请实施例图12所涉及的通信装置120可以为图3所示的通信装置30。
如前述，本申请实施例提供的通信装置110或通信装置120可以用于实施上述本申请各实施例实现的方法中核心网设备的功能，为了便于说明，仅示出了与本申请实施例相关的部分，具体技术细节未揭示的，请参照本申请各实施例。
下面通过具体示例，对本申请实施例提供的方案进行详细说明。
一方面，本申请实施例提供一种通信方法，该通信方法应用于5G通信系统中V2X 终端(V2X UE)、接入网设备(NG-RAN)以及核心网设备(AMF)的交互过程中，图13为该通信方法的流程图，如图13所示，该方法可以包括：
S1301、V2X UE有mode1 PC5通信的需求，V2X UE向AMF发送注册请求消息，注册请求消息携带不释放N2连接的信元。
其中，不要释放N2连接的信元即S401中描述的方式2中的显式的指示信息。不要释放N2连接的信元的功能为：请求保持或不释放AMF与V2X UE之间的N1连接、或者请求保持或不释放V2X UE在AMF与该V2X UE的NG-RAN之间的N2连接、或者请求保持或不释放V2X UE与NG-RAN之间的RRC连接、或者请求NG-RAN保留内部保存的V2X UE的上下文、或者请求V2X UE保持连接态。
需要说明的是，S1301中的注册请求消息是在S201中的注册请求消息的基础上，携带了不释放N2连接的信元。
S1302、AMF根据V2X UE的标识信息，从UDM处获取V2X UE的签约信息。
需要说明的是，S1302的具体实现参照S202，此处不再赘述。
S1303、AMF选择PCF，并建立AMF-PCF的关联关系。
需要说明的是，S1303的具体实现参照S203，此处不再赘述。
S1304、AMF基于不释放N2连接的信元，保持或不释放V2X UE在AMF与V2X终端的接入网设备之间的通信连接。
具体的，在S1304中，AMF可以基于注册请求消息中的不释放N2连接的信元以及下述信息中至少一种：V2X UE类型(例如，UE的类型是V2X)、V2X UE的能力信息(例如，UE支持PC5接口通信)、NG-RAN的能力信息(例如，NG-RAN支持PC5接口通信)保持或不释放V2X UE在AMF与V2X终端的接入网设备之间的通信连接。
其中，V2X UE的能力信息可以为V2X UE的签约信息中的能力，或者，也可以为V2X UE发送的能力信息，本申请实施例对此不进行具体限定。
例如，当AMF接收到“不释放N2连接”的信元时，且当UE的签约信息中指示UE的类型为V2X时，不释放N2连接。
再例如，当AMF接收到“不释放N2连接”的信元时，且当UE支持PC5接口通信时，不释放N2连接。
再例如，当AMF接收到“不释放N2连接”的信元时，且当UE的签约信息中指示UE的类型为V2X，且当UE支持PC5接口通信时，不释放N2连接。
需要说明的是，S1304的具体实现可以参照S403，此处不再赘述。
S1305、AMF向V2X UE发送注册接受消息(registration accept message)。
一种可能的实现中，S1305可以参照S204的具体实现，此处不再赘述。
另一种可能的实现中，S1305具体实现可以实现为S1305a至S1305c。
S1305a、AMF向NG-RAN发送NGAP消息。
其中，该NGAP消息包括注册接受消息以及第二指示。其中，第二指示用于指示NG-RAN保持或不释放V2X UE在AMF与NG-RAN之间的N2连接。
S1305b、NG-RAN根据第二指示，设置第一时长。
其中，S1305b的具体实现可以参照S407b，此处不再进行赘述。
S1305c、NG-RAN向V2X UE发送RRC消息，该RRC消息携带注册接受消息。
另一方面，本申请实施例提供一种通信方法，该通信方法应用于5G通信系统中V2X终端(V2X UE)、接入网设备(NG-RAN)以及核心网设备(AMF)的交互过程中，图14为该通信方法的流程图，如图14所示，该方法可以包括：
S1401、V2X UE有mode1 PC5通信的需求，V2X UE触发注册流程+业务请求流程(Registration Request+Service Request)。
S1402、V2X UE向AMF发送注册请求消息，注册请求消息携带follow-on request的标识(identity，ID)。
其中，follow-on request的ID即S401中描述的第一指示，用于指示V2X UE存在待处理的上行信令。
需要说明的是，S1402中的注册请求消息是在S201中的注册请求消息的基础上，携带了follow-on request的ID。
S1403、AMF根据V2X UE的标识信息，从UDM处获取V2X UE的签约信息。
需要说明的是，S1403的具体实现参照S202，此处不再赘述。
S1404、AMF选择PCF，并建立AMF-PCF的关联关系。
需要说明的是，S1404的具体实现参照S203，此处不再赘述。
S1405、AMF基于follow-on request的ID，保持或不释放V2X UE在AMF与V2X终端的NG-RAN之间的通信连接。
具体的，在S1405中，AMF可以基于注册请求消息中的follow-on request的ID，以及V2X UE的签约信息(例如，UE的类型是V2X)或者V2X UE的能力信息(例如，UE支持PC5接口通信)，保持或不释放V2X UE在AMF与V2X终端的接入网设备之间的通信连接。
其中，V2X UE的能力信息可以为V2X UE的签约信息中的能力，或者，也可以为V2X UE发送的能力信息，本申请实施例对此不进行具体限定。
S1406、AMF向V2X UE发送注册接受消息(registration accept message)。
一种可能的实现中，S1406可以参照S204的具体实现，此处不再赘述。
另一种可能的实现中，S1406具体实现可以实现为S1406a至S1406c。
S1406a、AMF向NG-RAN发送NGAP消息。
其中，该NGAP消息包括注册接受消息以及第二指示。其中，第二指示用于指示NG-RAN保持或不释放V2X UE在AMF与NG-RAN之间的N2连接。
S1406b、NG-RAN根据第二指示，设置第一时长。
其中，S1406b的具体实现可以参照S407b，此处不再进行赘述。
S1406c、NG-RAN向V2X UE发送RRC消息，该RRC消息携带注册接受消息。
S1407、V2X UE在接收到注册接受消息后，向AMF发送服务请求(service request，SR)消息。
其中，该SR消息用于请求不激活用户面资源。
例如，该SR用于保持V2X UE处于连接态，或者用于保持N2连接，或不释放N2连接。具体地，SR消息不携带PDU session to be activated信元，即UE不会进一步激活用户面资源(换言之，不会激活某个PDU会话)。
S1408、AMF接收SR消息。
在S1408中，AMF执行标准3GPP TS 23.502中的Service Request的流程，过程如同V2X终端从空闲态转换成连接态时的过程，此处不再赘述。
再一方面，本申请实施例提供再一种通信方法，该通信方法应用于5G通信系统中V2X终端(V2X UE)、接入网设备(NG-RAN)以及核心网设备(AMF)的交互过程中，图15为该通信方法的流程图，如图15所示，该方法可以包括：
S1501、V2X UE向AMF发送注册请求消息。
需要说明的是，S1501的具体实现参照S201，此处不再赘述。
S1502、AMF根据V2X UE的标识信息，从UDM处获取V2X UE的签约信息。
需要说明的是，S1502的具体实现参照S202，此处不再赘述。
S1503、AMF选择PCF，并建立AMF-PCF的关联关系。
需要说明的是，S1503的具体实现参照S203，此处不再赘述。
S1504、AMF向NG-RAN发送NGAP消息，携带注册接受消息，并启动T3540定时器。
其中，T3540定时器超时后，AMF释放V2X UE在AMF与V2X终端的接入网设备之间的通信连接。
S1505、NG-RAN向V2X UE发送RRC消息，该RRC消息携带注册接受消息。
S1506、V2X UE在接收到注册接受消息后，V2X UE有mode1 PC5通信的需求，V2X UE会向NG-RAN发送RRC消息请求资源。
S1507、NG-RAN接收到请求资源的RRC消息后，向AMF发送NGAP消息，该NGAP消息携带指示信息。
其中，该指示信息可以告知AMF，V2X UE存在正在进行的PC5接口通信。
一种可能的实现中，S1507可以替换为：NG-RAN接收到请求资源的RRC消息后，若该V2X UE处于连接态，则向AMF发送NGAP消息，该NGAP消息携带指示信息，即本方案仅适用于当AMF的T3540定时器未超时的情形。
S1508、AMF根据指示信息停止T3540定时器。
在S1507中，AMF根据指示信息停止T3540定时器，以实现保持或不释放V2X UE在AMF与V2X终端的接入网设备之间的通信连接。
再一方面，本申请实施例提供再一种通信方法，该通信方法应用于5G通信系统中V2X终端(V2X UE)、接入网设备(NG-RAN)以及核心网设备(AMF)的交互过程中，图16为该通信方法的流程图，如图16所示，该方法可以包括：
S1601、V2X UE向AMF发送注册请求消息。
需要说明的是，S1601的具体实现参照S201，此处不再赘述。
S1602、AMF根据V2X UE的标识信息，从UDM处获取V2X UE的签约信息。
需要说明的是，S1602的具体实现参照S202，此处不再赘述。
S1603、AMF选择PCF，并建立AMF-PCF的关联关系。
需要说明的是，S1603的具体实现参照S203，此处不再赘述。
S1604、AMF向NG-RAN发送NGAP消息，携带注册接受消息，并启动T3540定时器。
其中，T3540定时器超时后，AMF向NG-RAN发送用于释放N2连接的NGAP消息，以释放V2X UE在AMF与V2X终端的接入网设备之间的通信连接。
S1605、NG-RAN向V2X UE发送RRC消息，该RRC消息携带注册接受消息。
S1606、V2X UE在接收到注册接受消息后，V2X UE有mode1 PC5通信的需求，V2X UE会向NG-RAN发送RRC消息请求资源。
S1607、NG-RAN接收到请求资源的RRC消息后，启动第一定时器。
S1608、NG-RAN接收AMF发送的用于释放N2连接的NGAP消息。
若S1608中NG-RAN接收到用于释放N2连接的NGAP消息时，第一定时器超时，NG-RAN参照S209释放N2连接。若S1608中NG-RAN接收到用于释放N2连接的NGAP消息时，第一定时器未超时，NG-RAN执行S1609。
S1609、NG-RAN向AMF发送用于拒绝释放N2连接的NGAP消息。
可选的，NG-RAN向AMF发送的用于拒绝释放N2连接的NGAP消息中可以携带具体的拒绝原因值。该原因值可以为V2X UE存在正在进行的mode1 PC5接口通信。
S1610、AMF根据RAN的拒绝消息中的原因值，判断是否需要继续进行N2连接释放的尝试。
例如，当AMF如果由于AMF的失败导致需要释放N2连接时，AMF会再次发送NGAP消息。如果AMF仅是由于V2X UE存在正在进行的mode1 PC5接口通信，AMF就不会进一步发送NGAP消息。
可选的，如图16所示，在S1609之后，该通信方法还可以包括S1611及S1612，以避免V2X UE mode1PC5接口通信结束仍不释放N2连接。
S1611、NG-RAN启动用于判断V2X UE用户面空闲的定时器。
S1612、当用于判断V2X UE用户面空闲的定时器超时后，NG-RAN发起N2连接释放。
再一方面，本申请实施例提供一种通信系统，该通信系统中包括第一通信装置和第二通信装置，该第一通信装置可以实现核心网设备的功能，该第二通信装置可以实现V2X终端的功能。例如，第一通信装置为本申请实施例描述的核心网设备，第二通信装置为本申请实施例描述的V2X终端。
再一方面，本申请实施例提供一种通信系统，该通信系统中包括第三通信装置和第四通信装置，该第三通信装置可以实现核心网设备的功能，该第四通信装置可以实现接入网设备的功能。例如，第三通信装置为本申请实施例描述的核心网设备，第四通信装置为本申请实施例描述的接入网设备。
作为本实施例的另一种形式，提供一种计算机可读存储介质，其上存储有指令，该指令被执行时执行上述方法实施例中的方法。
作为本实施例的另一种形式，提供一种包含指令的计算机程序产品，该指令被执行时执行上述方法实施例中的方法。
本申请实施例再提供一种芯片系统，该芯片系统包括处理器，用于实现本发明实施例的技术方法。在一种可能的设计中，该芯片系统还包括存储器，用于保存本发明实施例通信设备必要的程序指令和/或数据。在一种可能的设计中，该芯片系统还包括存储器，用于处理器调用存储器中存储的应用程序代码。该芯片系统，可以由一个或 多个芯片构成，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。
结合本申请公开内容所描述的方法或者算法的步骤可以硬件的方式来实现，也可以是由处理器执行软件指令的方式来实现。软件指令可以由相应的软件模块组成，软件模块可以被存放于RAM、闪存、ROM、可擦除可编程只读存储器(erasable programmable ROM，EPROM)、电可擦可编程只读存储器(electrically EPROM，EEPROM)、寄存器、硬盘、移动硬盘、只读光盘(CD-ROM)或者本领域熟知的任何其它形式的存储介质中。一种示例性的存储介质耦合至处理器，从而使处理器能够从该存储介质读取信息，且可向该存储介质写入信息。当然，存储介质也可以是处理器的组成部分。处理器和存储介质可以位于ASIC中。另外，该ASIC可以位于核心网接口设备中。当然，处理器和存储介质也可以作为分立组件存在于核心网接口设备中。或者，存储器可以与处理器耦合，例如存储器可以是独立存在，通过总线与处理器相连接。存储器也可以和处理器集成在一起。存储器可以用于存储执行本申请实施例提供的技术方案的应用程序代码，并由处理器来控制执行。处理器用于执行存储器中存储的应用程序代码，从而实现本申请实施例提供的技术方案。
通过以上的实施方式的描述，所属领域的技术人员可以清楚地了解到，为描述的方便和简洁，仅以上述各功能模块的划分进行举例说明，实际应用中，可以根据需要而将上述功能分配由不同的功能模块完成，即将装置的内部结构划分成不同的功能模块，以完成以上描述的全部或者部分功能。
在本申请所提供的几个实施例中，应该理解到，所揭露的装置和方法，可以通过其它的方式实现。例如，以上所描述的装置实施例仅仅是示意性的，例如，所述模块或单元的划分，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，例如多个单元或组件可以结合或者可以集成到另一个装置，或一些特征可以忽略，或不执行。另一点，所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口，装置或单元的间接耦合或通信连接，可以是电性，机械或其它的形式。
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是一个物理单元或多个物理单元，即可以位于一个地方，或者也可以分布到多个不同地方。可以根据实际的需要选择其中的部分或者全部单元来实现本实施例方案的目的。
另外，在本申请各个实施例中的各功能单元可以集成在一个处理单元中，也可以是各个单元单独物理存在，也可以两个或两个以上单元集成在一个单元中。上述集成的单元既可以采用硬件的形式实现，也可以采用软件功能单元的形式实现。
所述集成的单元如果以软件功能单元的形式实现并作为独立的产品销售或使用时，可以存储在一个可读取存储介质中。基于这样的理解，本申请实施例的技术方案本质上或者说对现有技术做出贡献的部分或者该技术方案的全部或部分可以以软件产品的形式体现出来，该软件产品存储在一个存储介质中，包括若干指令用以使得一个设备(可以是单片机，芯片等)或处理器(processor)执行本申请各个实施例所述方法的全部或部分步骤。而前述的存储介质包括：U盘、移动硬盘、ROM、RAM、磁碟或者光盘等各种可以存储程序代码的介质。
以上所述，仅为本申请的具体实施方式，但本申请的保护范围并不局限于此，任 何在本申请揭露的技术范围内的变化或替换，都应涵盖在本申请的保护范围之内。因此，本申请的保护范围应以所述权利要求的保护范围为准。

Claims (20)

  1. 一种通信方法，其特征在于，包括：
    核心网设备获取用于指示车辆对所有V2X终端支持PC5接口通信的能力信息；
    所述核心网设备根据所述能力信息，在所述V2X终端完成注册后保持或不释放所述V2X终端与所述核心网设备之间的信令连接。
  2. 根据权利要求1所述的方法，其特征在于，所述核心网设备获取用于指示V2X终端支持PC5接口通信的能力信息，包括：
    所述核心网设备接收来自所述V2X终端的所述能力信息。
  3. 根据权利要求2所述的方法，其特征在于，所述能力信息携带在注册请求消息中。
  4. 根据权利要求1-3任一项所述的方法，其特征在于，所述核心网设备根据所述能力信息，在所述V2X终端完成注册后保持或不释放所述V2X终端与所述核心网设备之间的信令连接，包括：
    所述核心网设备根据所述能力信息，在所述V2X终端完成注册后不向接入网设备发送连接释放请求消息。
  5. 根据权利要求1-4任一项所述的方法，其特征在于，所述核心网设备根据所述能力信息，在所述V2X终端完成注册后保持或不释放所述V2X终端与所述核心网设备之间的信令连接，包括：
    所述核心网设备根据所述V2X终端的签约信息和所述能力信息，在所述V2X终端完成注册后保持或不释放所述V2X终端与所述核心网设备之间的信令连接。
  6. 根据权利要求1-5任一项所述的方法，其特征在于，所述核心网设备为接入和移动性管理功能AMF。
  7. 一种通信装置，其特征在于，所述通信装置为核心网设备，或者，所述通信装置为所述核心网设备中的装置或芯片系统，或者，所述通信装置为与所述核心网设备匹配使用的装置；所述通信装置包括：
    获取单元，用于获取用于指示车辆对所有V2X终端支持PC5接口通信的能力信息；
    处理单元，用于根据所述获取单元获取的所述能力信息，在所述V2X终端完成注册后保持或不释放所述V2X终端与所述核心网设备之间的信令连接。
  8. 根据权利要求7所述的装置，其特征在于，所述获取单元具体用于：
    接收来自所述V2X终端的所述能力信息。
  9. 根据权利要求8所述的装置，其特征在于，所述能力信息携带在注册请求消息中。
  10. 根据权利要求7-9任一项所述的装置，其特征在于，所述处理单元具体用于：
    根据所述能力信息，在所述V2X终端完成注册后不向接入网设备发送连接释放请求消息。
  11. 根据权利要求7-10任一项所述的装置，其特征在于，所述处理单元具体用于：
    根据所述V2X终端的签约信息和所述能力信息，在所述V2X终端完成注册后保持或不释放所述V2X终端与所述核心网设备之间的信令连接。
  12. 根据权利要求7-11任一项所述的装置，其特征在于，所述核心网设备为接入和移动性管理功能AMF。
  13. 一种通信装置，包括处理器和存储器，所述存储器和所述处理器耦合，所述处理器用于执行权利要求1至6任一项所述的通信方法。
  14. 一种计算机可读存储介质，包括指令，当其在计算机上运行时，使得计算机执行权利要求1至6任一项所述的通信方法。
  15. 一种计算机程序产品，当其在计算机上运行时，使得计算机执行权利要求1至6任一项所述的通信方法。
  16. 一种通信系统，其特征在于，所述通信系统包括车辆对所有V2X终端、核心网设备；其中，
    所述V2X终端用于，向所述核心网设备发送用于指示所述V2X终端支持PC5接口通信的能力信息；
    所述核心网设备用于，接收所述能力信息，并根据所述能力信息在所述V2X终端完成注册后保持或不释放所述V2X终端与所述核心网设备之间的信令连接。
  17. 根据权利要求16所述的通信系统，其特征在于，所述能力信息携带在注册请求消息中。
  18. 根据权利要求16或17所述的通信系统，其特征在于，所述核心网设备具体用于：
    根据所述能力信息，在所述V2X终端完成注册后不向接入网设备发送连接释放请求消息。
  19. 根据权利要求16-18任一项所述的通信系统，其特征在于，所述核心网设备具体用于：
    根据所述V2X终端的签约信息和所述能力信息，在所述V2X终端完成注册后保持或不释放所述V2X终端与所述核心网设备之间的信令连接。
  20. 根据权利要求16-19任一项所述的通信系统，其特征在于，所述核心网设备为接入和移动性管理功能AMF。
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