WO2020224494A1 - 一种通信方法和通信装置以及系统 - Google Patents

一种通信方法和通信装置以及系统 Download PDF

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Publication number
WO2020224494A1
WO2020224494A1 PCT/CN2020/087665 CN2020087665W WO2020224494A1 WO 2020224494 A1 WO2020224494 A1 WO 2020224494A1 CN 2020087665 W CN2020087665 W CN 2020087665W WO 2020224494 A1 WO2020224494 A1 WO 2020224494A1
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WIPO (PCT)
Prior art keywords
network element
parameter
user data
parameters
data management
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PCT/CN2020/087665
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English (en)
French (fr)
Inventor
李濛
应江威
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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Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to EP20801864.8A priority Critical patent/EP3952354A4/en
Publication of WO2020224494A1 publication Critical patent/WO2020224494A1/zh
Priority to US17/520,135 priority patent/US20220060868A1/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
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
    • H04W48/12—Access restriction or access information delivery, e.g. discovery data delivery using downlink control channel
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/02—Arrangements for optimising operational condition

Definitions

  • This application relates to the field of wireless communication technology, and in particular to a communication method, communication device and system.
  • V2X vehicle-to-everything
  • D2D device-to-device
  • base station relay communication The base station relay communication technology communicates through the Uu interface with high reliability.
  • V2X scenarios There are two V2X scenarios: One V2X scenario is based on cellular network coverage.
  • Cellular networks include but are not limited to: the fifth generation (5Generation, 5G) communication system and the fourth generation (4Generation, 4G) communication system.
  • the service can be provided by the Uu interface of the cellular network to achieve large bandwidth and large coverage communication, or it can be provided through the PC5 interface to achieve low-latency, high-reliability direct communication between the vehicle and the surrounding environment nodes; another V2X scenario is independent
  • the Internet of Vehicles road service is provided through the PC5 interface to meet the driving safety requirements.
  • data transmission can be seamlessly switched between the Uu interface and the PC5 interface.
  • a policy control function (PCF) network element provides V2X parameters to user equipment (UE), and the V2X parameters can be used for PC5 interface communication.
  • the V2X parameters sent by the PCF may include: parameters used in a 5G communication system and parameters used in a 4G communication system.
  • the UE sends a request to a V2X control function (V2X control function, V2XCF) network element, and the V2XCF network element provides V2X parameters to the UE.
  • V2X control function V2X control function
  • the UE actively initiates the establishment of the association relationship between the UE and the V2XCF, and then the V2XCF sends the V2X parameters to the UE.
  • the UE In the V2X scenario, if the UE has acquired the V2X parameters used in the 4G communication system in the 5G communication system, when the UE moves to the 4G communication system, the UE will not trigger the process of obtaining the V2X parameters again.
  • the UE When the UE tries to communicate with 4G
  • the radio access network (RAN) in the system communicates, the UE still uses the V2X parameters obtained in the 5G communication system for the 4G communication system, which may cause the UE to fail in communication.
  • RAN radio access network
  • the embodiments of the present application provide a communication method, a communication device, and a system, which are used to enable a terminal device to obtain updated V2X parameters and solve the problem of communication failure caused by the terminal device using expired V2X parameters.
  • an embodiment of the present application provides a communication method, including: a vehicle to all V2X control network elements receiving parameter update indication information sent by a user data management network element, the parameter update indication information is used to indicate the V2X parameters of the terminal device An update occurs; the V2X control network element sends the updated V2X parameters to the terminal device according to the parameter update indication information.
  • the V2X control network element can receive the parameter update instruction information from the user data management network element, and the V2X control network element can send the updated V2X parameters to the terminal device according to the received instruction information, so the terminal The device can obtain the updated V2X parameters from the V2X control network element, and the terminal device can use the updated V2X parameters to communicate, thereby solving the problem of communication failure caused by the terminal device using expired V2X parameters.
  • the method further includes: the V2X control network element obtaining updated V2X parameters from the user data management network element.
  • the user data management network element can update the V2X parameters and store the updated V2X parameters
  • the user data management network element can interact with the V2X control network element to provide the updated V2X parameters to the V2X control network element.
  • the updated V2X parameters sent by the user data management network element can be sent in one message with the parameter update notification information sent by the user data management network element, or the updated V2X parameters can be sent before or after the parameter update notification information is sent. There is no limitation here.
  • the parameter update indication information is further used to indicate that the terminal device is reachable in the first network, where the V2X control network element is a network element in the first network.
  • the user data management network element sends parameter update notification information to the V2X control network element, and the parameter update notification information is used to notify the V2X control network element that the terminal device is reachable on the first network, and the V2X The control network element may determine that the terminal device is reachable on the first network.
  • the reachability of the terminal device on the first network includes: the terminal device is registered in the first network.
  • the terminal device is reachable on the first network, specifically, it may include the terminal device registering to the first network, and the user data management network element sends to the V2X control network element when the terminal device is reachable on the first network Parameter update notification information.
  • the reachability of the terminal device in the first network includes that the terminal device is registered in the first network.
  • the parameter update notification information can explicitly instruct the terminal device to switch from the second network to the first network, or it can only instruct the terminal device to access the first network, and the V2X controls the network element to update according to the received parameter.
  • the notification information determines the switching operation of the terminal device.
  • the V2X parameters include at least one of the following: a list of operator network PLMNs used for PC5 interface communication; information indicating whether to perform PC5 interface communication; wireless resource configuration parameters used for PC5 interface communication ; Network selection strategy information for PC5 interface communication; mapping relationship between V2X service and terminal equipment identification information.
  • the V2X parameter may be the subscription information notified by the HSS to the V2XCF.
  • the operator network PLMN list used for PC5 interface communication may be a list of PLMNs that the UE can perform PC5 interface communication under the coverage of E-UTRA or NR.
  • the indication information of whether to perform PC5 interface communication refers to the information whether the UE can perform LTE PC5/NR PC5 communication if it is not under E-UTRA and not under NR coverage.
  • the indication information can occupy 1 bit, and the value is 0 or 1 to indicate Whether to perform PC5 communication.
  • the radio resource configuration parameters used for PC5 interface communication refer to the specific radio resource parameters that the UE can use LTE PC5 or NR PC5 for communication under the conditions of "not E-UTRA and not under NR coverage".
  • the wireless resource configuration parameter may include corresponding geographic location information, such as a list containing geographic location information.
  • the network selection strategy information used for PC5 interface communication refers to the selection strategy information used to select LTE PC5 or NR PC5 communication, and specifically includes the mapping information of "V2X service" and "corresponding to PC5 interface".
  • the V2X parameters may also include the mapping relationship between the "V2X service” and the "corresponding identification information” used to establish a PC5 unicast connection and used for PC5 multicast and broadcast communication.
  • the content included in the V2X parameters can be determined according to the application scenario, which is only described here, and is not intended to limit the embodiments of the present application.
  • an embodiment of the present application also provides a communication method, including: the user data management network element determines that all V2X parameters of the terminal device are updated; the user data management network element sends a parameter update instruction to the V2X control network element Information, the parameter update indication information is used to indicate that the V2X parameter of the terminal device is updated.
  • the V2X control network element receives the parameter update indication information sent by the user data management network element, and the parameter update indication information is used to indicate that the V2X parameter of the terminal device is updated.
  • the V2X control network element sends the updated V2X parameters to the terminal device according to the parameter update instruction information.
  • the V2X control network element can receive parameter update instruction information from the user data management network element, and the V2X control network element can send updated V2X parameters to the terminal device according to the received instruction information, so the terminal device can download
  • the V2X control network element obtains the updated V2X parameters, and the terminal device can use the updated V2X parameters to communicate, thereby solving the problem of communication failure caused by the terminal device using expired V2X parameters.
  • the user data management network element determines that all V2X parameters of the terminal equipment are updated, including: the user data management network element receives the parameter issuance request sent by the policy control function PCF network element Information, the parameter issuance request information is used to request the V2X parameters of the terminal device from the user data management network element; the user data management network element determines the first moment according to the parameter issuance request information; The user data management network element updates the V2X parameters of the terminal device and obtains the second time when the V2X parameters are updated; the user data management network element determines the V2X of the terminal device according to the first time and the second time The parameters are updated.
  • the user data management network element may determine the first moment according to the parameter issuance request information sent by the PCF network element, and the first moment may be the time determined according to the parameter issuance request information.
  • the user data management network element may also use the time when the V2X parameter information is updated as the second time.
  • the user data management network element compares the obtained first time and second time respectively, and determines that the V2X parameters need to be updated according to the first time and the second time. For example, the V2X parameters are determined when the first time and the second time meet the preset conditions Need to be updated. For example, when the first time and the second time are not equal, the user data management network element determines that the V2X parameters need to be updated.
  • the first moment is the request moment carried in the parameter issuance request information, or the first moment is the moment when the parameter issuance request information is received.
  • the first time may be the time for requesting the V2X parameters carried in the parameter issuance request information, or may be the time recorded according to the instructions of the parameter issuance request information.
  • the user data management network element determines that all V2X parameters of the terminal device are updated, including at least one of the following situations: the user data management network element determines that the terminal device is In the unreachable state, it is determined that the V2X parameters are updated; when the user data management network element determines that the terminal device is in the deregistered state, it is determined that the V2X parameters are updated; the user data management network element determines that the user When the V2X parameter stored by the data management network element changes, it is determined that the V2X parameter is updated. Among them, when the terminal device is in an unreachable state, it is determined that the V2X parameters of the terminal device need to be updated.
  • the terminal device when the terminal device is in the unregistered state, it is determined that the V2X parameters of the terminal device need to be updated.
  • the V2X parameters stored in the user data management network element change, for example, the user's subscription data changes.
  • the user's previous subscription information includes value-added services, contains multiple operator networks, and can support comparison The maximum PC5 interface transmission rate is high, but the user cancels the value-added service for some reasons, and the maximum PC5 interface transmission rate is reduced.
  • the user's previous subscription information supports PC5 communication in the networks of multiple operators, but due to changes in the subscription information, the supported operators have changed. Or, the V2X parameters have expired. Based on the above example, the user data management network element can accurately learn that the V2X parameters are updated.
  • the method further includes: the user data management network element sending updated V2X parameters to the V2X control network element.
  • the user data management network element can update the V2X parameters and store the updated V2X parameters
  • the user data management network element can interact with the V2X control network element to provide the updated V2X parameters to the V2X control network element.
  • the updated V2X parameters sent by the user data management network element can be sent in one message with the parameter update notification information sent by the user data management network element in step 412, or the updated V2X can be sent before or after the parameter update notification information is sent.
  • the parameters are not limited here.
  • an embodiment of the present application provides a communication method, including: a policy control function PCF network element sends parameter issuance request information to a user data management network element, and the parameter issuance request information is used to manage the user data
  • the network element requests the V2X parameters of the terminal device; the PCF network element receives the V2X parameters sent by the user data management network element.
  • the PCF network element when the PCF network element needs to provide V2X parameters to the terminal device, the PCF network element will trigger the process of obtaining the V2X parameters from the user data management network element.
  • the PCF network element requests the user data management network element for V2X Parameters, the user data management network element sends a response message to the PCF network element, and the response message contains the V2X parameters.
  • the user data management network element can determine that the PCF network element has sent the V2X parameters to the terminal device according to the parameter issuance request information sent by the PCF network element.
  • the parameter issuance request information carries information about the time when the PCF network element requests the V2X parameters; or, the parameter issuance request information is used to instruct the user data management network element Record the moment when the parameter issuance request message is received.
  • the user data management network element may determine the first moment according to the parameter issuance request information sent by the PCF network element. The first moment may be the moment when the V2X parameter is requested in the parameter issuance request information, or it may be based on the parameter The instruction to deliver the request information records the moment of receiving the parameter delivery request message.
  • the user data management network element may determine whether the V2X parameter is updated according to the first time determined from the parameter delivery request information and the second time when the user data management network element updates the V2X parameter.
  • an embodiment of the present application provides a communication method, including: a user data management network element determines that all V2X parameters of the terminal device are updated; the user data management network element sends parameter update instructions to the V2X control network element
  • the parameter update indication information is used to indicate that the V2X parameter of the terminal device is updated; the V2X control network element sends the updated V2X parameter to the terminal device according to the parameter update indication information.
  • the method further includes: the V2X control network element obtains the updated V2X parameters from the user data management network element.
  • the user data management network element determines that all V2X parameters of the terminal equipment are updated, including: the user data management network element receives the parameter issuance request sent by the policy control function PCF network element Information, the parameter issuance request information is used to request the V2X parameters of the terminal device from the user data management network element; the user data management network element determines the first moment according to the parameter issuance request information; The user data management network element updates the V2X parameters of the terminal device and obtains the second time when the V2X parameters are updated; the user data management network element determines that the V2X parameters are updated according to the first time and the second time .
  • the method further includes: the policy control function PCF network element sends parameter issuance request information to the user data management network element, and the parameter issuance request information is used to send the user data to the user data.
  • the management network element requests the V2X parameters of the terminal device; the user data management network element receives the parameter issuance request information, and sends the V2X parameters of the terminal device to the PCF network element according to the parameter issuance request information;
  • the PCF network element receives the V2X parameter of the terminal device sent by the user data management network element.
  • an embodiment of the present application provides a communication device, the communication device is a vehicle to all V2X control network elements, including at least one processor, and the at least one processor is configured to be coupled with a memory, read and execute the Instructions in the memory to implement the method according to any one of the foregoing first aspects.
  • the communication device further includes: the memory.
  • an embodiment of the present application provides a communication device.
  • the communication device is a user data management network element and includes at least one processor configured to couple with a memory, read and execute To implement the method described in any one of the foregoing second aspects.
  • the communication device further includes: the memory.
  • an embodiment of the present application provides a communication device.
  • the communication device is a PCF network element with a policy control function, and includes at least one processor for coupling with a memory, reading and executing the memory In order to implement the method described in any one of the foregoing third aspects.
  • the communication device further includes: the memory.
  • the component modules of the V2X control network element, the user data management network element, and the PCF network element can also perform the steps described in the foregoing method and various possible implementation manners, For details, see the description of the method and various possible implementations.
  • an embodiment of the present application provides a communication system, characterized in that the communication system includes: the vehicle according to any one of the fifth aspect to all V2X control network elements, such as any one of the sixth aspect User data management network element described in item.
  • the communication system further includes: the policy control function PCF network element according to any one of the seventh aspect.
  • an embodiment of the present application provides a communication method, including: a vehicle to all V2X control network elements to receive parameter delivery notification information sent by a policy control function PCF network element, and the parameter delivery notification information is used to notify the V2X control network element:
  • the PCF network element sends V2X parameters to the terminal device;
  • the V2X control network element receives parameter update notification information sent by a user data management network element, and the parameter update notification information is used to notify the V2X control network element V2X parameter update;
  • the V2X control network element sends the updated V2X parameter to the terminal device according to the parameter delivery notification information and the parameter update notification information.
  • the V2X control network element can issue notification information from the parameters received by the PCF, and can also receive parameter update notification information from the user data management network element.
  • the V2X control network element can be based on the two received notification information
  • the updated V2X parameters can be sent to the terminal device, so the terminal device can obtain the updated V2X parameter from the V2X control network element, and the terminal device can use the updated V2X parameter to communicate, thus solving the problem of the terminal device using the expired V2X parameter The problem that caused communication failure.
  • the V2X control network element sends the updated V2X parameters to the terminal device according to the parameter delivery notification information and the parameter update notification information, including: the V2X control network The element determines that the V2X parameter needs to be updated according to the parameter delivery notification information and the parameter update notification information, and sends the updated V2X parameter to the terminal device. Among them, after the V2X control network element receives the parameter issuance notification information and the parameter update notification information respectively, the V2X control network element can compare and analyze the content notified by the parameter notification information and the parameter update notification information. V2X The control network element can determine that the V2X parameter of the terminal device needs to be updated.
  • the V2X parameter needs to be updated means that the V2X parameter used on the terminal device has changed and the V2X parameter needs to be updated.
  • the V2X control network element can send the updated V2X parameter to the terminal device, so that the terminal device can obtain the updated V2X parameter in time.
  • the V2X control network element determines that the V2X parameters need to be updated according to the parameter delivery notification information and the parameter update notification information, including: the V2X control network element
  • the parameter issuance notification information determines the first moment, and the second moment is determined according to the parameter update notification information; the V2X control network element determines that the V2X parameter needs to be updated according to the first moment and the second moment.
  • the first time is the time when the V2X parameter is sent in the parameter delivery notification information, or the first time is the time when the parameter delivery notification information is received;
  • the second moment is the moment when the V2X parameter is updated carried by the parameter update notification information, or the second moment is the moment when the parameter update notification information is received.
  • the V2X control network element can determine the first moment according to the parameter issuance notification information sent by the PCF network element.
  • the first moment can be the time when the V2X parameter is sent in the parameter issuance notification information, or it can be issued according to the parameter.
  • the V2X control network element may also determine the second time according to the parameter update notification information sent by the user data management network element.
  • the second time may be the time when the V2X parameter is updated in the parameter update notification information, or it may be based on the parameter update notification information.
  • the V2X control network element compares the obtained first time and second time respectively, and the V2X control network element determines that the V2X parameters need to be updated according to the first time and the second time, for example, when the first time and the second time meet the preset conditions Determine that the V2X parameters need to be updated. For example, when the first time and the second time are not equal, the V2X control network element determines that the V2X parameters need to be updated.
  • the method further includes: the V2X control network element obtaining updated V2X parameters from the user data management network element.
  • the user data management network element can update the V2X parameters and store the updated V2X parameters
  • the user data management network element can interact with the V2X control network element to provide the updated V2X parameters to the V2X control network element.
  • the updated V2X parameters sent by the user data management network element can be sent in one message with the parameter update notification information sent by the user data management network element in step 412, or the updated V2X can be sent before or after the parameter update notification information is sent.
  • the parameters are not limited here.
  • the V2X control network element receiving the parameter issuance notification information sent by the policy control function PCF network element includes: the V2X control network element receives the PCF network through the network opening function NEF network element The parameter is sent by the meta to send notification information.
  • the user data management network element and the V2X control network element can be completed through the NEF network element.
  • the user data management network element first generates parameter update notification information, and then sends the parameter update notification information to the NEF network element, and the NEF network element receives the parameter
  • the NEF network element can send parameter update notification information to the V2X control network element, so that the V2X control network element can obtain the parameter update notification information from the user data management network element through the NEF network element.
  • the parameter update notification information is further used to indicate that the terminal device is reachable in the first network, where the V2X control network element is a network element in the first network.
  • the user data management network element sends parameter update notification information to the V2X control network element, and the parameter update notification information is used to notify the V2X control network element that the terminal device is reachable on the first network, and the V2X The control network element may determine that the terminal device is reachable on the first network.
  • the reachability of the terminal device on the first network includes: the terminal device is registered in the first network.
  • the terminal device is reachable on the first network, specifically, it may include the terminal device registering to the first network, and the user data management network element sends to the V2X control network element when the terminal device is reachable on the first network Parameter update notification information.
  • the reachability of the terminal device in the first network includes that the terminal device is registered in the first network.
  • an embodiment of the present application provides a communication method, including: a user data management network element updates all V2X parameters of a vehicle to a terminal device; the user data management network element sends parameter update notification information to the V2X control network element, so The parameter update notification information is used to notify the terminal device of the V2X parameter update.
  • the V2X control network element can issue notification information from the parameters received by the PCF, and can also receive parameter update notification information from the user data management network element.
  • the V2X control network element can be based on the two received notification information
  • the updated V2X parameters can be sent to the terminal device, so the terminal device can obtain the updated V2X parameter from the V2X control network element, and the terminal device can use the updated V2X parameter to communicate, thus solving the problem of the terminal device using the expired V2X parameter The problem that caused communication failure.
  • the user data management network element updates the vehicle to all V2X parameters of the terminal device, including at least one of the following situations: the user data management network element determines that the terminal device is unreachable When the state, it is determined that the V2X parameters are updated; when the user data management network element determines that the terminal device is in the deregistered state, it is determined that the V2X parameters are updated; the user data management network element determines that the user data management When the V2X parameter stored by the network element changes, it is determined that the V2X parameter is updated.
  • the parameter update notification information carries information about the time when the user data management network element updates the V2X parameters; or, the parameter update notification information indicates that the V2X control network element records The time when the parameter update notification message is received.
  • the time when the PCF network element sends the V2X parameters refers to the time when the PCF network element sends the V2X parameters to the terminal device.
  • the V2X parameter time may include the time when the PCF network element sends the V2X parameters for the 4G communication system to the terminal device.
  • the V2X parameter Can include: V2X parameters for 4G communication systems.
  • the time when the PCF network element sends the V2X parameters can be a timestamp.
  • the V2X control network element can obtain the time when the PCF network element sends the V2X parameters to the terminal device.
  • the parameter update notification information is also used to indicate that the terminal device is reachable on the first network.
  • the user data management network element sends parameter update notification information to the V2X control network element, and the parameter update notification information is used to notify the V2X control network element that the terminal device is reachable on the first network, and the V2X The control network element may determine that the terminal device is reachable on the first network.
  • the reachability of the terminal device on the first network includes: the terminal device is successfully registered in the first network.
  • the terminal device is reachable on the first network, specifically, it may include the terminal device registering to the first network, and the user data management network element sends to the V2X control network element when the terminal device is reachable on the first network Parameter update notification information.
  • the reachability of the terminal device in the first network includes that the terminal device is registered in the first network.
  • the V2X parameters include at least one of the following: a list of operator network PLMNs used for PC5 interface communication; information indicating whether to perform PC5 interface communication; wireless resource configuration parameters used for PC5 interface communication ; Network selection strategy information for PC5 interface communication; mapping relationship between V2X service and terminal equipment identification information.
  • an embodiment of the present application provides a communication method, including: a policy control function PCF network element sends all V2X parameters of the vehicle to a terminal device; the PCF network element sends parameter delivery notification information to the V2X control network element, The parameter delivery notification information is used to notify the V2X control network element that the PCF network element sends the V2X parameter to the terminal device.
  • the V2X control network element can issue notification information from the parameters received by the PCF, and can also receive parameter update notification information from the user data management network element.
  • the V2X control network element can be based on the two received notification information
  • the updated V2X parameters can be sent to the terminal device, so the terminal device can obtain the updated V2X parameter from the V2X control network element, and the terminal device can use the updated V2X parameter to communicate, thus solving the problem of the terminal device using the expired V2X parameter The problem that caused communication failure.
  • the parameter issuance notification information carries the time when the PCF network element sends the V2X parameters; or, the parameter issuance notification information is used to instruct the V2X control network element to record receipt It is the moment when the parameter is issued a notification message.
  • the PCF network element sending the parameter issuance notification information to the V2X control network element includes: the PCF network element sends the V2X control network element to the V2X control network element through the network opening function NEF network element Parameter delivery notification information.
  • the communication between the PCF network element and the V2X control network element can be completed through the NEF network element.
  • the PCF network element first generates the parameter distribution notification message, and then sends the parameter distribution notification message to the NEF network element, and the NEF network element receives the parameter distribution After the information is notified, the NEF network element can send the parameter distribution notification information to the V2X control network element, so that the V2X control network element can obtain the parameter distribution notification information from the PCF network element through the NEF network element.
  • an embodiment of the present application provides a communication device, characterized in that the communication device is a vehicle to all V2X control network elements, including at least one processor, and the at least one processor is configured to couple with a memory and read Fetch and execute the instructions in the memory to implement the method according to any one of the ninth aspects.
  • the communication device further includes: the memory.
  • an embodiment of the present application provides a communication device.
  • the communication device is a user data management network element, and includes at least one processor configured to couple with a memory, read and execute the memory In order to implement the method described in any one of the tenth aspect.
  • the communication device further includes: the memory.
  • an embodiment of the present application provides a communication device.
  • the communication device is a PCF network element with a policy control function, and includes at least one processor.
  • the at least one processor is configured to be coupled to a memory, read and execute the Instructions in the memory to implement the method according to any one of the eleventh aspects.
  • the communication device further includes: the memory.
  • an embodiment of the present application provides a communication system, the communication system includes: the vehicle as described in any one of the twelfth aspect to all V2X control network elements, as in any one of the thirteenth aspect The user data management network element, and the policy control function PCF network element according to any one of the fourteenth aspect.
  • an embodiment of the present application provides a computer-readable storage medium that stores instructions in the computer-readable storage medium, which when run on a computer, causes the computer to execute the first to fourth aspects above , The method described in the ninth aspect to the eleventh aspect.
  • the embodiments of the present application provide a computer program product containing instructions that, when run on a computer, enable the computer to execute the foregoing aspects of the first to fourth aspects, and the ninth to eleventh aspects. Methods.
  • the present application provides a chip system including a processor for supporting the aforementioned V2X control network element, user data management network element, and PCF network element to implement the functions involved in the above aspects, for example , To send or process the data and/or information involved in the above methods.
  • the chip system further includes a memory, and the memory is used to store the necessary program instructions and data of the aforementioned V2X control network element, user data management network element, and PCF network element.
  • the chip system may be composed of chips, or may include chips and other discrete devices.
  • FIG. 1 is a schematic diagram of the composition architecture of a communication system provided by an embodiment of the application
  • FIG. 2 is a schematic diagram of a combination of a 4G communication system and a 5G communication system according to an embodiment of the application;
  • FIG. 3 is a schematic diagram of a communication architecture between network elements in a communication system provided by an embodiment of the application;
  • FIG. 4 is a schematic diagram of an interaction process between a V2X control network element, a user data management network element, and a PCF network element according to an embodiment of the application;
  • FIG. 5 is a schematic diagram of an interaction flow of the communication method provided by an embodiment of the application in an interaction scenario
  • FIG. 6 is a schematic diagram of another interaction process between a V2X control network element and a user data management network element provided by an embodiment of the application;
  • FIG. 7a is a schematic diagram of the interaction process of the communication method provided by an embodiment of the application in another interaction scenario
  • FIG. 7b is a schematic diagram of the interaction process of the communication method provided by an embodiment of the application in another interaction scenario
  • FIG. 8 is a schematic diagram of another interaction process between a user data management network element and an MME provided by an embodiment of the application;
  • FIG. 9 is a schematic diagram of an interaction flow of the communication method provided by an embodiment of the application in another interaction scenario.
  • FIG. 10 is a schematic diagram of the composition structure of a V2X control network element provided by an embodiment of this application.
  • FIG. 11 is a schematic diagram of the composition structure of a user data management network element provided by an embodiment of the application.
  • FIG. 12 is a schematic diagram of the composition structure of a PCF network element provided by an embodiment of the application.
  • the embodiments of the present application provide a communication method, a communication device, and a system, which are used to enable a terminal device to obtain updated V2X parameters and solve the problem of communication failure caused by the terminal device using expired V2X parameters.
  • the technical solutions of the embodiments of the present application may be applied to various data processing communication systems.
  • 3GPP's long term evolution (LTE) and various versions based on LTE evolution are new versions of UMTS using E-UTRA.
  • the Fifth Generation (5 Generation, "5G”) communication system, and New Radio (“NR”) are the next generation communication systems under study.
  • the communication system may also be applicable to future-oriented communication technologies, all of which are applicable to the technical solutions provided in the embodiments of the present application.
  • the system architecture and business scenarios described in the embodiments of this application are intended to illustrate the technical solutions of the embodiments of this application more clearly, and do not constitute a limitation on the technical solutions provided in the embodiments of this application. Those of ordinary skill in the art will know that with the network With the evolution of architecture and the emergence of new business scenarios, the technical solutions provided in the embodiments of the present application are equally applicable to similar technical problems.
  • Fig. 1 shows a schematic diagram of the composition structure of a communication system according to an embodiment of the present application.
  • the communication system provided by the embodiment of the present application may include: a vehicle to everything (V2X) control network element, a user data management network element, and a policy control function (PCF) network element.
  • V2X control network element refers to the network element that has the control function in the V2X scenario.
  • the V2X control network element may include the V2X control function (V2X control function, V2XCF).
  • V2X control network element may also be a 4G communication system. Other network elements that control the function.
  • a user data management network element refers to a network element with data management functions in a V2X scenario.
  • the user data management network element can be a unified data management function entity (UDM) and a home subscriber server (HSS) ), or the user data management network element may also be a unified data repository (UDR), and the user data management network element may also be other network elements with terminal device data storage functions in the 4G communication system.
  • a PCF network element refers to a network element that provides policy information.
  • a PCF network element may provide UE policy parameter information to the UE.
  • the UE policy parameter information may include V2X parameters.
  • the PCF network element may provide access and mobility management function (AMF) network elements with access management (access management, AM) policy parameter information, or the PCF network element may report to the session management function (session management function) parameter information.
  • AMF access and mobility management function
  • the management function, SMF provides parameter information of a session management (session management, SM) strategy.
  • the PCF network element can provide V2X parameters to the UE and the next generation-radio access network (NG-RAN).
  • the V2X parameters can include V2X authentication and policies. Parameters and other information.
  • the network element may be a functional entity, a software module, a hardware module, a combination of software and hardware, and so on.
  • the names of the aforementioned V2X control network elements, user data management network elements, and PCF network elements are just one possible implementation. The embodiment of this application does not limit the specific network element names, which can be determined based on the network element functions in specific scenarios. The name of the corresponding network element.
  • the PCF network element may be referred to as PCF for short
  • the AMF network element may be referred to as AMF for short
  • the SMF network element may be referred to as SMF for short.
  • FIG. 2 it is a schematic diagram of an architecture combining a 4G communication system and a 5G communication system provided by an embodiment of this application.
  • the V2X control network element may specifically be a V2XCF
  • the user data management network element may specifically include: HSS+UDM, or UDR.
  • the UE communicates with the evolved universal terrestrial radio access network (E-UTRAN).
  • the E-UTRAN is connected to the MME through the S1-MME interface, and the E-UTRAN is connected through the S1-U interface.
  • SGW serving gateway
  • MME is connected to HSS+UDM through S6a interface
  • V2XCF is connected to UE through V3 interface
  • SGW is connected to user plane function (UPF) network element + user through S5-U interface
  • PGW gateway-user, PGW-U is connected
  • the SGW is connected to SMF+PGW-C through the S5-C interface
  • the packet data gateway (PDN gateway-control, PGW-C) of the SMF+ control plane is connected through the N10
  • the interface is connected with HSS+UDM
  • UDR is connected with HSS+UDM through the N35 interface.
  • UE connects to AMF through N1 interface
  • UE communicates with NG-RAN
  • AMF connects to NG-RAN through N2 interface
  • UPF+PGW-U connects to NG-RAN through N3 interface
  • AMF connects to NG-RAN through N11 interface
  • AMF connects to PCF through N15 interface
  • AMF connects to HSS+UDM through N8 interface.
  • MME is connected to AMF through N26 interface
  • PCF is connected to UDR through N36 interface. Based on Figure 2 above, it can be seen that V2XCF can communicate with UE, and PCF can communicate with UDR.
  • FIG. 3 it is a schematic diagram of a communication architecture between network elements in a communication system provided by an embodiment of this application.
  • network function (NF) network elements can communicate through network exposure function (NEF) network elements and application function (AF) network elements.
  • NEF network exposure function
  • AF application function
  • NF network elements namely NF1, NF2, ..., NFn
  • NF can communicate with NEF through the third generation partnership project (3GPP) layer.
  • 3GPP third generation partnership project
  • NF1-NFn represent the network elements inside the core network, such as UDM, AMF, PCF, etc.
  • NEF network element is a network element used for operator networks to open data in the network to third-party application servers, or to receive data provided by third-party application servers for the network.
  • NEF network elements can be configured with n application programming interfaces ( application programming interface, API), respectively API1, ..., APIn, NEF network elements can communicate with AF through the N33 interface, AF refers to network elements outside the core network of the 5G communication system, for example, AF can be an application server or a local The aforementioned V2XCF in the application examples.
  • the communication method provided by the embodiment of this application mainly includes the following steps:
  • the PCF network element sends V2X parameters to the terminal device.
  • the PCF network element may send V2X parameters to the terminal device.
  • the PCF network element can send V2X parameters to the terminal device through the AMF network element.
  • the terminal device may specifically be a terminal such as a UE, and the V2X parameter may be a UE parameter used for PC5 communication.
  • the V2X parameter may include: authorization information for PC5 communication.
  • the PCF network element may send V2X parameters to the terminal device.
  • the second network may be a 5G communication network.
  • the V2X parameters may include: V2X parameters for the second network and V2X parameters for the first network.
  • the first network may be a 4G communication network.
  • the V2X parameter includes at least one of the following:
  • PLMN public land mobile network
  • mapping relationship between the V2X service and the identification information of the terminal device is the mapping relationship between the V2X service and the identification information of the terminal device.
  • the V2X parameter may be the subscription information notified by the HSS to the V2XCF.
  • the operator network PLMN list used for PC5 interface communication may be a list of PLMNs that the UE can perform PC5 interface communication under the coverage of E-UTRA or NR.
  • the indication information of whether to perform PC5 interface communication refers to the information whether the UE can perform LTE PC5/NR PC5 communication if it is not under E-UTRA and not under NR coverage. For example, the indication information can occupy 1 bit, and the value is 0 or 1 to indicate Whether to perform PC5 communication.
  • the radio resource configuration parameters used for PC5 interface communication refer to the specific radio resource parameters that the UE can use LTE PC5 or NR PC5 for communication under the conditions of "not E-UTRA and not under NR coverage".
  • the wireless resource configuration parameter may include corresponding geographic location information, such as a list containing geographic location information.
  • the network selection strategy information used for PC5 interface communication refers to the selection strategy information used to select LTE PC5 or NR PC5 communication, and specifically includes the mapping information of "V2X service" and "corresponding to PC5 interface".
  • the V2X parameters may also include the mapping relationship between the "V2X service” and the "corresponding identification information" used to establish a PC5 unicast connection and used for PC5 multicast and broadcast communication.
  • the content included in the V2X parameters can be determined according to the application scenario, which is only described here, and is not intended to limit the embodiments of the present application.
  • the PCF network element sends parameter distribution notification information to the V2X control network element, and the parameter distribution notification information is used to notify the V2X control network element that the PCF network element sends V2X parameters to the terminal device.
  • the PCF network element may send parameter delivery notification information to the V2X control network element.
  • the parameter issuance notification information sent by the PCF network element is used to notify the PCF network element to send V2X parameters to the terminal device, that is, the parameter distribution notification information is used to indicate: the PCF network element has sent the V2X parameter to the terminal device, then it is received
  • the V2X control network element that issues the notification information for this parameter can determine that the PCF network element has sent the V2X parameter to the terminal device.
  • the PCF network element sends parameter delivery notification information to the V2X control network element, including:
  • the PCF network element sends parameter delivery notification information to the V2X control network element through the network opening function NEF network element.
  • the NEF network element can be used to complete the communication between the PCF network element and the V2X control network element.
  • the PCF network element first generates parameter notification information and then sends it to the NEF network element. Parameter issuance notification information.
  • the NEF network element can send the parameter distribution notification information to the V2X control network element, so that the V2X control network element can obtain it from the PCF network element through the NEF network element Send notification information to the parameter.
  • the PCF network element can also directly communicate with the V2X control network element, that is, the PCF network element directly sends the parameter distribution notification information to the V2X control network element, without the need to pass the NEF Network element.
  • the parameter issuance notification information carries information about the time when the PCF network element sends the V2X parameters; or,
  • the parameter issuance notification information is used to instruct the V2X control network element to record the moment when the parameter issuance notification message is received.
  • the moment when the PCF network element sends the V2X parameters refers to the moment when the PCF network element sends the V2X parameters to the terminal device.
  • the moment of the V2X parameter may include the moment when the PCF network element sends the V2X parameters for the 4G communication system to the terminal device.
  • the V2X parameters may include: V2X parameters for the 4G communication system.
  • the time when the PCF network element sends the V2X parameters can be a timestamp.
  • the V2X control network element can obtain the time when the PCF network element sends the V2X parameters to the terminal device.
  • the parameter issuance notification information sent by the PCF network element in the embodiment of this application can also carry the address information of the V2X control network element and the identification information of the terminal device. No more detailed description here.
  • the parameter issuance notification information may also indicate that the V2X control network element obtains the moment when the parameter issuance notification message is received. That is, the parameter issuance notification information can also be used to instruct the V2X control network element to record the moment when the parameter issuance notification information is received.
  • the V2X control network element receives the parameter issuance notification information, the V2X control network element can record the receipt of the notification information. The moment when the parameter is sent notification information.
  • the user data management network element updates the V2X parameters of the terminal device.
  • the user data management network element refers to a network element with data management functions in a V2X scenario.
  • the user data management network element may be UDM and HSS, or the user data management network element may also be UDR .
  • the user data management network element first updates the V2X parameters of the terminal device.
  • the user data management network element can store the V2X parameters of the terminal device.
  • the user data management network element can update the terminal when the V2X parameters of the terminal device are updated. V2X parameters of the device. There are many ways to update the V2X parameters, which will be illustrated below.
  • the user data management network element updates the vehicle to all V2X parameters of the terminal device, including at least one of the following situations:
  • the user data management network element determines that the terminal device is in an unreachable state, determining that the V2X parameter is updated;
  • the user data management network element determines that the terminal device is in the deregistered state, it determines that the V2X parameters are updated;
  • the user data management network element determines that the V2X parameter stored by the user data management network element has changed, it is determined that the V2X parameter is updated.
  • the terminal device when the terminal device is in an unreachable state, it is determined that the V2X parameters of the terminal device need to be updated. For another example, when the terminal device is in the unregistered state, it is determined that the V2X parameters of the terminal device need to be updated.
  • the V2X parameters stored in the user data management network element change, for example, the user's subscription data changes.
  • the user's previous subscription information includes value-added services, contains multiple operator networks, and can support higher The maximum transmission rate of the PC5 interface, but the user cancelled the value-added service for some reasons, and the maximum transmission rate of the PC5 interface was reduced.
  • the user's previous subscription information supports PC5 communication in the networks of multiple operators, but due to changes in the subscription information, the supported operators have changed. Or, the V2X parameters have expired. Based on the above example, the user data management network element can accurately learn that the V2X parameters are updated.
  • the user data management network element sends parameter update notification information to the V2X control network element, where the parameter update notification information is used to notify the user data management network element to update the V2X parameters.
  • the user data management network element may send parameter update notification information to the V2X control network element.
  • the parameter update notification information sent by the user data management network element is used to notify the V2X control network element that the user data management network element has updated the V2X parameters, and the V2X control network element that receives the parameter update notification information can determine: user data The management network element has updated the V2X parameters.
  • the step 412 that the user data management network element sends parameter update notification information to the V2X control network element includes:
  • the user data management network element sends parameter update notification information to the V2X control network element through the NEF network element.
  • the user data management network element and the V2X control network element can be completed through the NEF network element.
  • the user data management network element first generates parameter update notification information, and then sends it to NEF The network element sends parameter update notification information.
  • the NEF network element can send the parameter update notification information to the V2X control network element, so that the V2X control network element can access the user data management network through the NEF network element.
  • Meta gets the parameter update notification information.
  • the user data management network element can also directly communicate with the V2X control network element, that is, the user data management network element directly sends parameter update notification information to the V2X control network element instead of Need to pass NEF network element.
  • the parameter update notification information carries the time when the user data management network element updates the V2X parameters; or,
  • the parameter update notification information indicates that the V2X control network element obtains the time when the parameter update notification message is received.
  • the time when the user data management network element updates the V2X parameters refers to the time recorded when the user data management network element updates the V2X parameters.
  • the time when the user data management network element updates the V2X parameters can be a timestamp.
  • the V2X control network element receives the parameter update notification information, the V2X control network element can obtain the time when the user data management network element updates the V2X parameters.
  • the parameter update notification information sent by the user data management network element in the embodiment of the present application can carry the address information of the V2X control network element and the terminal equipment in addition to the time when the user data management network element sends the V2X parameters. Identification information, no detailed description here.
  • the parameter update notification information may also indicate that the V2X control network element obtains the moment when the parameter update notification message is received. That is, the parameter update notification information can also be used to instruct the V2X control network element to store the moment when the parameter update notification information is received. When the V2X control network element receives the parameter update notification information, the V2X control network element can store the received parameter update notification. The moment of information.
  • the parameter update notification information is also used to indicate that the terminal device is reachable on the first network.
  • the user data management network element sends parameter update notification information to the V2X control network element, and the parameter update notification information is used to notify the V2X control network element that the terminal device is reachable on the first network, and the V2X The control network element may determine that the terminal device is reachable on the first network.
  • the reachability of the terminal device on the first network includes: the terminal device is successfully registered in the first network.
  • the user data management network element can determine from the mobility management entity that the terminal device switches to the second network, and the user data management network element is in the parameter update notification message at this time Carry the information that the terminal device is reachable in the first network and send it to the V2X control network element, so that the V2X control network element can receive parameter update notification information from the user data management network element, and the V2X control network element can update according to the parameter
  • the notification information determines that the terminal device is reachable on the first network, and realizes the real-time perception of the reachable state of the terminal device by the V2X control network element.
  • the first network may be a 4G network
  • the second network may be a 5G network.
  • the terminal device is reachable on the first network, specifically, it may include the terminal device registering to the first network, and the user data management network element sends to the V2X control network element when the terminal device is reachable on the first network Parameter update notification information.
  • the reachability of the terminal device in the first network includes that the terminal device is registered in the first network.
  • the parameter update notification information can explicitly instruct the terminal device to switch from the second network to the first network, or it can only instruct the terminal device to access the first network, and the V2X controls the network element to update according to the received parameter.
  • the notification information determines the switching operation of the terminal device.
  • the V2X control network element receives the parameter distribution notification information sent by the PCF network element, and the parameter distribution notification information is used to notify the V2X control network element that the PCF network element sends V2X parameters to the terminal device.
  • the V2X control network element when the PCF network element performs the aforementioned step 402, the V2X control network element receives the parameter issuance notification information sent by the PCF network element, and the V2X control network element that receives the parameter issuance notification information can determine Out: The PCF network element has sent V2X parameters to the terminal device.
  • the step 421 that the V2X control network element receives the parameter delivery notification information sent by the PCF network element includes:
  • the V2X control network element receives the parameter distribution notification information sent by the PCF network element through the network opening function NEF network element.
  • the user data management network element and the V2X control network element can be completed through the NEF network element.
  • the user data management network element first generates parameter update notification information, and then sends it to NEF The network element sends parameter update notification information.
  • the NEF network element can send the parameter update notification information to the V2X control network element, so that the V2X control network element can access the user data management network through the NEF network element.
  • Meta gets the parameter update notification information.
  • the user data management network element can also directly communicate with the V2X control network element, that is, the user data management network element directly sends parameter update notification information to the V2X control network element instead of Need to pass NEF network element.
  • the V2X control network element receives parameter update notification information sent by the user data management network element, and the parameter update notification information is used to notify the V2X control network element of the update of the V2X parameters.
  • the V2X control network element when the user data management network element performs the aforementioned step 412, the V2X control network element receives the parameter update notification information sent by the user data management network element, and the V2X control network element that receives the parameter update notification information It can be determined that the user data management network element has updated the V2X parameters.
  • the V2X control network element sends the updated V2X parameters to the terminal device according to the parameter delivery notification information and the parameter update notification information.
  • the V2X control network element after the V2X control network element receives the parameter issuance notification information and the parameter update notification information, the V2X control network element compares and analyzes the parameter issuance notification information and the parameter update notification information, and the V2X control network element can Send the updated V2X parameters to the terminal device so that the terminal device can obtain the updated V2X parameters in time, and the terminal device can use the updated V2X parameters to communicate, thereby solving the problem of communication failure caused by the terminal device using expired V2X parameters .
  • the V2X control network element can send the latest V2X parameters to the terminal device through the device trigger process.
  • the V2X control network element can trigger the terminal device to establish a packet data network (PDN) connection through the device trigger process, and the terminal device can request the latest V2X parameters from the V2X control network element, and the V2X control network element can follow the terminal The device requests the latest V2X parameters.
  • PDN packet data network
  • the V2X control network element sends the updated V2X parameters to the terminal device according to the parameter delivery notification information and the parameter update notification information, including:
  • the V2X control network element determines that the V2X parameters need to be updated according to the parameter delivery notification information and the parameter update notification information, and sends the updated V2X parameters to the terminal device.
  • the V2X control network element can compare and analyze the content notified by the parameter notification information and the parameter update notification information.
  • V2X The control network element can determine that the V2X parameter of the terminal device needs to be updated.
  • the V2X parameter needs to be updated means that the V2X parameter used on the terminal device has changed and the V2X parameter needs to be updated.
  • the V2X control network element can send the updated V2X parameter to the terminal device, so that the terminal device can obtain the updated V2X parameter in time.
  • the V2X control network element determines that the V2X parameters need to be updated according to the parameter delivery notification information and the parameter update notification information, including:
  • the V2X control network element determines the first moment according to the parameter notification information, and determines the second moment according to the parameter update notification information;
  • the V2X control network element determines that the V2X parameter needs to be updated according to the first time and the second time.
  • the V2X control network element can determine the first moment according to the parameter issuance notification information sent by the PCF network element.
  • the first moment can be the time when the V2X parameter is sent in the parameter issuance notification information, or it can be issued according to the parameter.
  • the V2X control network element may also determine the second time according to the parameter update notification information sent by the user data management network element.
  • the second time may be the time when the V2X parameter is updated in the parameter update notification information, or it may be based on the parameter update notification information. At the moment recorded by the instructions.
  • the V2X control network element compares the obtained first time and second time respectively, and the V2X control network element determines that the V2X parameters need to be updated according to the first time and the second time, for example, when the first time and the second time meet the preset conditions Determine that the V2X parameters need to be updated. For example, when the first time and the second time are not equal, the V2X control network element determines that the V2X parameters need to be updated.
  • the communication method provided in the embodiments of the present application may further include the following steps:
  • the V2X control network element obtains the updated V2X parameters from the user data management network element.
  • the user data management network element can update the V2X parameters and store the updated V2X parameters, and the user data management network element can interact with the V2X control network element to provide the updated V2X parameters to the V2X control network element.
  • the updated V2X parameters sent by the user data management network element can be sent in one message with the parameter update notification information sent by the user data management network element in step 412, or it can be sent before or after the parameter update notification information is sent. Send the updated V2X parameters, which are not limited here.
  • the parameter update notification information is further used to indicate that the terminal device is reachable in the first network, where the V2X control network element is a network element in the first network.
  • the user data management network element sends parameter update notification information to the V2X control network element, and the parameter update notification information is used to notify the V2X control network element that the terminal device is reachable on the first network, and the V2X The control network element may determine that the terminal device is reachable on the first network.
  • the reachability of the terminal device on the first network includes: the terminal device is successfully registered in the first network.
  • the user data management network element can determine from the mobility management entity that the terminal device switches to the second network, and the user data management network element is in the parameter update notification message at this time Carry the information that the terminal device is reachable in the first network and send it to the V2X control network element, so that the V2X control network element can receive parameter update notification information from the user data management network element, and the V2X control network element can update according to the parameter
  • the notification information determines that the terminal device is reachable on the first network, and realizes the real-time perception of the reachable state of the terminal device by the V2X control network element.
  • the first network may be a 4G network
  • the second network may be a 5G network.
  • the terminal device is reachable on the first network, specifically, it may include the terminal device registering to the first network, and the user data management network element sends to the V2X control network element when the terminal device is reachable on the first network Parameter update notification information.
  • the reachability of the terminal device in the first network includes that the terminal device is registered in the first network.
  • the parameter update notification information can explicitly instruct the terminal device to switch from the second network to the first network, or it can only instruct the terminal device to access the first network, and the V2X controls the network element to update according to the received parameter.
  • the notification information determines the switching operation of the terminal device.
  • the V2X control network element receives the parameter distribution notification information sent by the PCF network element, and the parameter distribution notification information is used to notify the PCF network element to send V2X parameters to the terminal device; the V2X control network element receives user data
  • the parameter update notification information sent by the management network element is used to notify the user that the data management network element updates the V2X parameters; the V2X control network element sends the notification information and parameter update notification information according to the parameters, and sends the updated V2X to the terminal device parameter.
  • the V2X control network element can issue notification information from the parameters received by the PCF, and can also receive parameter update notification information from the user data management network element.
  • the V2X control network element can be based on the two received notification information. Send the updated V2X parameters to the terminal device, so the terminal device can obtain the updated V2X parameter from the V2X control network element, and the terminal device can use the updated V2X parameter to communicate, thus solving the communication caused by the terminal device using the expired V2X parameter The problem of failure.
  • FIG. 5 is a schematic diagram of the interaction process of the communication method provided by the embodiment of the present application in an interaction scenario.
  • the V2X control network element is specifically V2XCF
  • the terminal device is specifically UE
  • the user data management network element is specifically UDM+HSS for example, mainly including the following processes:
  • the V2XCF subscribes to the control information notification from the HSS.
  • the V2XCF subscribes to the HSS for control information notification, so that when the HSS has updated control information, it is sent to the V2XCF.
  • the V2XCF subscribes to the control information notification from the PCF.
  • the V2XCF subscribes to the PCF for control information notification, so that when the PCF has updated control information, it is sent to the V2XCF.
  • the UE registers with the core network in the 5G communication system.
  • the UE can be registered to the core network in the 5G system, and the specific registration process will not be repeated.
  • the PCF sends V2X parameters to the UE.
  • the V2X communication parameters used by the UE for the PC5 can be sent to the UE by the PCF via the AMF during the UE Configuration Update (Configuration Update) initiated by the PCF.
  • the message that PCF can use is the UE Configuration Update (UCU for short) Command message, and the policy information it contains is the V2X parameters used for V2X communication.
  • the PCF sends a V2X parameter provision notification (provides a time stamp).
  • the PCF After the PCF provides the V2X parameters to the UE, it will also send a message to the V2XCF, which is used to inform the V2XCF that the PCF has provided the parameters to the UE.
  • the message may include time information when the PCF sends the UE Configuration Update Command to the UE. Examples are as follows:
  • PCF can send this message to V2XCF through NEF.
  • the specific process can be:
  • the PCF sends a message to the NEF, and the message is used to instruct the NEF to send a message "used to inform the V2XCF that the PCF has provided the UE with parameters" to the V2XCF.
  • the message sent by the PCF to the NEF may include: the time when the PCF sends the UE Configuration Update Command to the UE, the address information of the V2XCF, and the identification information of the corresponding UE.
  • the identification of the UE may be a subscriber permanent identifier (subscriber permanent identifier, SUPI).
  • the PCF sends this message directly to the V2XCF.
  • the specific process may be: the PCF sends the message "to inform the V2XCF that the PCF has provided the UE with parameters" to the V2XCF.
  • the message may include: time information when the PCF sends the UE Configuration Update Command to the UE, and identification information of the corresponding UE (which may be a SUPI identification).
  • the V2XCF can obtain the corresponding time when the PCF sends the message.
  • the corresponding time can be directly included in the message sent by the PCF, or the time when the V2XCF receives the message.
  • V2XCF stores this corresponding time.
  • UDM+HSS sends an update notification of V2X parameters (carrying updated timestamp).
  • the message may include the time information when the UDM+HSS updates the UE parameters.
  • UDM+HSS can send this message to V2XCF through NEF.
  • the specific process can be: UDM+HSS sends a message to NEF.
  • the message is used to instruct NEF and then to V2XCF to send the message "to inform V2XCF UE's parameters have been updated".
  • the message sent by UDM+HSS to NEF may include: time information when UDM+HSS updates UE parameters, address information of V2XCF, and identification information of the corresponding UE (which may be a SUPI identifier).
  • UDM+HSS sends this message directly to V2XCF.
  • the specific process can be: UDM+HSS sends the message "to inform V2XCF UE's parameters have been updated" to V2XCF.
  • the message may include: information about the time when the UDM+HSS updates the UE parameters, and identification information of the corresponding UE (which may be a SUPI identification).
  • the UE attaches to an evolved packet core (EPC).
  • EPC evolved packet core
  • UDM+HSS sends indication information to the V2XCF, which may specifically include: UDM+HSS notifies the V2XCF that the UE has accessed the network.
  • V2XCF finds that the parameters of this UE need to be updated, the V2XCF triggers the parameter update procedure. Specifically, it can rely on the following process: V2XCF finds that the V2X parameters stored by the UE need to be updated by comparing the corresponding time of the message received from the PCF and UDM+HSS.
  • the V2XCF sends the latest parameters to the UE through the Device trigger process; or through the Device trigger process, triggers the UE to establish a PDN connection, and then can communicate with the V2XCF.
  • the PCF provides UE parameters in the embodiment of this application
  • the provided timestamp is notified to the relevant V2XCF.
  • This method does not involve the modification of EPC network elements such as MME and has little impact on the current 4G standard.
  • the V2XCF compares the two stored moments and determines that the V2X parameters stored by the UE need to be updated, and then triggers the UE to initiate the V2X parameter acquisition process through the existing Device trigger process.
  • the problem of inconsistency in V2X parameters between the UE and the core network is solved.
  • FIG. 6 a schematic diagram of an interaction process between the V2X control network element and the user data management network element provided by the embodiment of the present application.
  • the communication method provided by the embodiment of the present application mainly includes the following steps:
  • the user data management network element determines that the V2X parameter of the terminal device is updated.
  • the user data management network element refers to a network element with data management functions in a V2X scenario.
  • the user data management network element may be UDM and HSS, or the user data management network element may also be UDR .
  • the user data management network element first updates the V2X parameters of the terminal device.
  • the user data management network element can store the V2X parameters of the terminal device.
  • the user data management network element can update the terminal when the V2X parameters of the terminal device are updated. V2X parameters of the device. There are many ways to update the V2X parameters, which will be illustrated below.
  • step 601 the user data management network element determines that the V2X parameters of the terminal device are updated, including at least one of the following situations:
  • the user data management network element determines that the terminal device is in an unreachable state, determining that the V2X parameter is updated;
  • the user data management network element determines that the terminal device is in a deregistered state, it determines that the V2X parameters are updated;
  • the user data management network element determines that the V2X parameter stored by the user data management network element has changed, it is determined that the V2X parameter is updated.
  • the terminal device when the terminal device is in an unreachable state, it is determined that the V2X parameters of the terminal device need to be updated. For another example, when the terminal device is in the unregistered state, it is determined that the V2X parameters of the terminal device need to be updated.
  • the V2X parameters stored in the user data management network element change, for example, the user's subscription data changes.
  • the user's previous subscription information includes value-added services, contains multiple operator networks, and can support comparison The maximum PC5 interface transmission rate is high, but the user cancels the value-added service for some reasons, and the maximum PC5 interface transmission rate is reduced.
  • the user's previous subscription information supports PC5 communication in the networks of multiple operators, but due to changes in the subscription information, the supported operators have changed. Or, the V2X parameters have expired. Based on the above example, the user data management network element can accurately learn that the V2X parameters are updated.
  • step 601 the user data management network element determines that all V2X parameters of the vehicle of the terminal device are updated, including:
  • the user data management network element receives the parameter issuance request information sent by the policy control function PCF network element, and the parameter issuance request information is used to request V2X parameters from the user data management network element;
  • the user data management network element determines the first moment according to the parameter issuance request information
  • the user data management network element updates the V2X parameters and obtains the second moment when the V2X parameters are updated;
  • the user data management network element determines that the V2X parameter of the terminal device is updated according to the first time and the second time.
  • the user data management network element may determine the first moment according to the parameter issuance request information sent by the PCF network element, and the first moment may be the time determined according to the parameter issuance request information.
  • the user data management network element may also use the time when the V2X parameter information is updated as the second time.
  • the user data management network element compares the obtained first time and second time respectively, and determines that the V2X parameters need to be updated according to the first time and the second time. For example, the V2X parameters are determined when the first time and the second time meet the preset conditions Need to be updated. For example, when the first time and the second time are not equal, the user data management network element determines that the V2X parameters need to be updated.
  • the first moment is the request moment carried in the parameter issuance request information, or the first moment is the moment when the parameter issuance request information is received.
  • the first time may be the time for requesting the V2X parameters carried in the parameter issuance request information, or may be the time recorded according to the instructions of the parameter issuance request information.
  • the embodiments of the present application also provide a communication method executed by a PCF network element, which mainly includes the following steps:
  • the PCF network element sends parameter delivery request information to the user data management network element, and the parameter delivery request information is used to request the user data management network element for V2X parameters of the terminal device.
  • the PCF network element receives the V2X parameters sent by the user data management network element.
  • the PCF network element when the PCF network element needs to provide V2X parameters to the terminal device, the PCF network element will trigger the process of obtaining the V2X parameters from the user data management network element. Specifically, the PCF network element requests the V2X parameters from the user data management network element, and the user data The management network element sends a response message to the PCF network element, and the response message contains V2X parameters.
  • the parameter issuance request information carries time information when the PCF network element requests the V2X parameters; or,
  • the parameter issuance request information is used to instruct the user data management network element to record the moment when the parameter issuance request message is received.
  • the user data management network element may determine the first moment according to the parameter issuance request information sent by the PCF network element.
  • the first moment may be the moment when the V2X parameter is requested in the parameter issuance request information, or it may be based on the parameter
  • the instruction to deliver the request information records the moment of receiving the parameter delivery request message.
  • the user data management network element may determine whether the V2X parameter is updated according to the first time determined from the parameter delivery request information and the second time when the user data management network element updates the V2X parameter.
  • the user data management network element sends parameter update indication information to the V2X control network element, where the parameter update indication information is used to indicate that the V2X parameter of the terminal device is updated.
  • the user data management network element may send parameter update instruction information to the V2X control network element.
  • the parameter update indication information sent by the user data management network element is used to indicate that the V2X parameter of the terminal device is updated, and the V2X control network element that receives the parameter update indication information can determine that the V2X parameter is updated.
  • the V2X control network element receives parameter update indication information sent by the user data management network element, where the parameter update indication information is used to indicate that the V2X parameter of the terminal device is updated.
  • the V2X control network element when the user data management network element performs the aforementioned step 602, the V2X control network element receives the parameter update instruction information sent by the user data management network element, and the V2X control network element that receives the parameter update instruction information It can be determined that the V2X parameters of the terminal device are updated.
  • the V2X control network element sends the updated V2X parameters to the terminal device according to the parameter update instruction information.
  • the V2X control network element determines from the indication carried in the parameter update indication information that the V2X parameters are updated, and the V2X control network element can send the updated V2X to the terminal device Parameters, so that the terminal device can obtain the updated V2X parameters in time, and the terminal device can use the updated V2X parameters to communicate, thereby solving the problem of communication failure caused by the terminal device using expired V2X parameters.
  • the parameter update indication information is also used to indicate that the terminal device is reachable on the first network.
  • the user data management network element sends parameter update indication information to the V2X control network element, and the parameter update indication information is used to notify the V2X control network element that the terminal device is reachable on the first network, and the V2X The control network element may determine that the terminal device is reachable on the first network.
  • the reachability of the terminal device on the first network includes: the terminal device is successfully registered in the first network.
  • the user data management network element can determine from the mobility management entity that the terminal device switches to the second network, and the user data management network element is in the parameter update indication information at this time Carry the information that the terminal device is reachable in the first network and send it to the V2X control network element, so that the V2X control network element can receive parameter update indication information from the user data management network element, and the V2X control network element can update according to the parameter
  • the indication information determines that the terminal device is reachable on the first network, and realizes the real-time perception of the reachable state of the terminal device by the V2X control network element.
  • the first network may be a 4G network
  • the second network may be a 5G network.
  • the terminal device is reachable on the first network, specifically, it may include the terminal device registering to the first network, and the user data management network element sends to the V2X control network element when the terminal device is reachable on the first network Parameter update instructions.
  • the reachability of the terminal device in the first network includes that the terminal device is registered in the first network.
  • the parameter update indication information can explicitly instruct the terminal device to switch from the second network to the first network, or it can only instruct the terminal device to access the first network, and the V2X controls the network element to update according to the received parameter.
  • the instruction information determines the switching operation of the terminal device.
  • the V2X parameter includes at least one of the following:
  • mapping relationship between the V2X service and the identification information of the terminal device is the mapping relationship between the V2X service and the identification information of the terminal device.
  • the V2X parameter may be the subscription information notified by the HSS to the V2XCF.
  • the operator network PLMN list used for PC5 interface communication may be a list of PLMNs that the UE can perform PC5 interface communication under the coverage of E-UTRA or NR.
  • the indication information of whether to perform PC5 interface communication refers to the information whether the UE can perform LTE PC5/NR PC5 communication if it is not under E-UTRA and not under NR coverage. For example, the indication information can occupy 1 bit, and the value is 0 or 1 to indicate Whether to perform PC5 communication.
  • the radio resource configuration parameters used for PC5 interface communication refer to the specific radio resource parameters that the UE can use LTE PC5 or NR PC5 for communication under the conditions of "not E-UTRA and not under NR coverage".
  • the wireless resource configuration parameter may include corresponding geographic location information, such as a list containing geographic location information.
  • the network selection strategy information used for PC5 interface communication refers to the selection strategy information used to select LTE PC5 or NR PC5 communication, and specifically includes the mapping information of "V2X service" and "corresponding to PC5 interface".
  • the V2X parameters may also include the mapping relationship between the "V2X service” and the "corresponding identification information" used to establish a PC5 unicast connection and used for PC5 multicast and broadcast communication.
  • the content included in the V2X parameters can be determined according to the application scenario, which is only described here, and is not intended to limit the embodiments of the present application.
  • the communication method provided in the embodiments of the present application may further include the following steps:
  • the V2X control network element obtains the updated V2X parameters from the user data management network element.
  • the user data management network element can update the V2X parameters and store the updated V2X parameters, and the user data management network element can interact with the V2X control network element to provide the updated V2X parameters to the V2X control network element.
  • the updated V2X parameters sent by the user data management network element can be sent in one message with the parameter update notification information sent by the user data management network element in step 412, or it can be sent before or after the parameter update notification information is sent. Send the updated V2X parameters, which are not limited here.
  • the V2X control network element receives the parameter update indication information sent by the user data management network element, and the parameter update indication information is used to indicate that the V2X parameter of the terminal device is updated.
  • the V2X control network element sends the updated V2X parameters to the terminal device according to the parameter update instruction information.
  • the V2X control network element can receive parameter update instruction information from the user data management network element, and the V2X control network element can send updated V2X parameters to the terminal device according to the received instruction information, so the terminal device can download
  • the V2X control network element obtains the updated V2X parameters, and the terminal device can use the updated V2X parameters to communicate, thereby solving the problem of communication failure caused by the terminal device using expired V2X parameters.
  • FIG. 7a is a schematic diagram of the interaction process of the communication method provided in an embodiment of the present application in an interaction scenario.
  • the V2X control network element as the V2XCF
  • the terminal device as the UE
  • the user data management network element as the UDM+HSS, or UDR
  • it mainly includes the following processes:
  • the V2XCF subscribes to the control information notification from the HSS.
  • the V2XCF subscribes to the HSS for control information notification, so that when the HSS has updated control information, it is sent to the V2XCF.
  • the UE registers with the core network in the 5G communication system.
  • the UE can be registered to the core network in the 5G system, and the specific registration process will not be repeated.
  • the PCF obtains the V2X parameters.
  • PCF When PCF needs to provide V2X parameters to UE, PCF will trigger the process of obtaining V2X parameters from UDM+HSS/UDR. Specifically, PCF requests V2X parameters from UDM+HSS and UDR, and UDM+HSS/UDR sends a response message to PCF. The message contains V2X parameters.
  • UDM+HSS/UDR stores time information.
  • the UDM+HSS/UDR network element stores time information, and the time information may be: the corresponding time carried in the PCF sending request, or the corresponding time when the PCF request is received.
  • the PCF sends V2X parameters to the UE.
  • the V2X communication parameters for PC5 used by the UE will be sent by the PCF to the UE via the AMF during the UE Configuration Update process initiated by the PCF.
  • the message used may be the UE Configuration Update Command message, and the policy information it contains is the V2X parameters used for V2X communication.
  • the V2X parameters of the UE change, for example, the subscription information of the UE changes.
  • This information may be the subscription information stored in UDM+HSS/UDR.
  • UDM+HSS/UDR records the information "parameters need to be updated on the UE side", which can be specifically: UDM+HSS/UDR records the time information when it updates the UE parameters, compares the time when the parameters are sent to the UE, and updates At the moment of UE parameters, it is determined that the parameters on the UE side need to be updated. Or, when the parameters of the UE need to be updated, UDM+HSS/UDR finds that the UE is unreachable at this time, and UDM+HSS/UDR determines that the parameters on the UE side need to be updated.
  • the UE registers with the EPC.
  • UDM+HSS provides the latest V2X parameters.
  • the UE is then attached to the EPC.
  • the MME needs to obtain UE parameters from the HSS, so UDM+HSS/UDR learns to register in the 4G communication network.
  • UDM+HSS/UDR sends a message to the V2XCF at this time, informing the V2XCF that the parameters of this UE need to be updated, and then the V2XCF triggers the parameter update process.
  • the specific process can be passed: V2XCF compares the corresponding time of the message received from the PCF and UDM+HSS, and finds that the V2X parameters stored by the UE need to be updated.
  • the V2XCF provides V2X parameters to the UE.
  • the V2XCF sends the latest parameters to the UE through the Device trigger process; or through the Device trigger process, triggers the UE to establish a PDN connection, and then can communicate with the V2XCF.
  • the embodiment of the present application provides a method for providing V2X parameters to the UE through the core network in the 5G communication system.
  • UDM+HSS determines whether UE parameters need to be updated, and when UE accesses EPC, UDM+HSS/UDR informs V2XCF that UE parameters need to be updated.
  • the HSS+UDM/UDR triggers the update of parameters on the UE side according to the update of the subscription information and the condition that the UE is unreachable.
  • the communication method provided by the embodiment of the application is in an interactive scenario. Schematic diagram of the interaction process under. Taking the V2X control network element as V2XCF, the terminal device as the UE, and the user data management network element as the UDM+HSS, or UDR as an example, it mainly includes the following processes:
  • the UE registers with the core network in the 5G communication system.
  • the PCF sends V2X parameters to the UE.
  • the V2X communication parameters for PC5 used by the UE will be sent by the PCF to the UE via the AMF during the UE Configuration Update process initiated by the PCF.
  • the message used may be the UE Configuration Update Command message, and the policy information it contains is the V2X parameters used for V2X communication.
  • the V2X parameters of the UE change, for example, the subscription information of the UE changes.
  • This information may be the subscription information stored in UDM+HSS/UDR.
  • UDM+HSS/UDR records the information "parameters need to be updated on the UE side", which can be specifically: When the parameters of the UE need to be updated, UDM+HSS/UDR finds that the UE is unreachable at this time, and UDM+HSS/ The UDR determines that the parameters on the UE side need to be updated.
  • the unreachable here means that the UE is unreachable in the 5G communication system.
  • the UE registers with the EPC.
  • the UE is then attached to the EPC.
  • the MME needs to obtain UE parameters from the HSS, so UDM+HSS/UDR learns to register in the 4G communication network.
  • the message that the MME obtains the parameters from the HSS may be an Update Location Request message.
  • UDM+HSS provide the latest V2X parameters.
  • UDM+HSS/UDR sends a message to the V2XCF at this time, informing the V2XCF that the parameters of this UE need to be updated, and then the V2XCF triggers the parameter update process. Specifically, after receiving the message, the V2XCF finds that the V2X parameters stored by the UE need to be updated through the message itself or the indication information that the parameters contained in the message need to be updated.
  • the V2XCF provides V2X parameters to the UE.
  • the steps for the V2XCF to provide parameters to the UE may be: the V2XCF sends the latest parameters to the UE through the Device trigger process; or through the Device trigger process, triggers the UE to establish a PDN connection, and then can communicate with the V2XCF.
  • the embodiment of the present application provides a method for providing V2X parameters to the UE through the core network in the 5G communication system.
  • UDM+HSS determines whether UE parameters need to be updated, and when UE accesses EPC, UDM+HSS/UDR informs V2XCF that UE parameters need to be updated.
  • the communication method provided by the embodiment of this application As shown in FIG. 8, the communication between the user data management network element and the mobility management entity (mobility management entity, MME) provided in this embodiment of the application A schematic diagram of an interaction process.
  • the communication method provided in the embodiment of the present application mainly includes the following steps:
  • the user data management network element determines that the V2X parameter of the terminal device is updated.
  • the user data management network element refers to a network element with data management functions in a V2X scenario.
  • the user data management network element may be UDM and HSS, or the user data management network element may also be UDR .
  • the user data management network element first updates the V2X parameters of the terminal device.
  • the user data management network element can store the V2X parameters of the terminal device.
  • the user data management network element can update the terminal when the V2X parameters of the terminal device are updated. V2X parameters of the device. There are many ways to update the V2X parameters, which will be illustrated below.
  • step 801 the user data management network element determines that the V2X parameters of the terminal device are updated, including at least one of the following situations:
  • the user data management network element determines that the terminal device is in an unreachable state, determining that the V2X parameter is updated;
  • the user data management network element determines that the terminal device is in a deregistered state, it determines that the V2X parameters are updated;
  • the user data management network element determines that the V2X parameter stored by the user data management network element has changed, it is determined that the V2X parameter is updated.
  • the terminal device when the terminal device is in an unreachable state, it is determined that the V2X parameters of the terminal device need to be updated. For another example, when the terminal device is in the unregistered state, it is determined that the V2X parameters of the terminal device need to be updated.
  • the V2X parameters stored in the user data management network element change, for example, the user's subscription data changes.
  • the user's previous subscription information includes value-added services, contains multiple operator networks, and can support comparison The maximum PC5 interface transmission rate is high, but the user cancels the value-added service for some reasons, and the maximum PC5 interface transmission rate is reduced.
  • the user's previous subscription information supports PC5 communication in the networks of multiple operators, but due to changes in the subscription information, the supported operators have changed. Or, the V2X parameters have expired. Based on the above example, the user data management network element can accurately learn that the V2X parameters are updated.
  • step 801 the user data management network element determines that all V2X parameters of the vehicle of the terminal device are updated, including:
  • the user data management network element receives the parameter issuance request information sent by the policy control function PCF network element, and the parameter issuance request information is used to request V2X parameters from the user data management network element;
  • the user data management network element determines the first moment according to the parameter issuance request information
  • the user data management network element updates the V2X parameters and obtains the second moment when the V2X parameters are updated;
  • the user data management network element determines that the V2X parameter is updated according to the first moment and the second moment.
  • the user data management network element may determine the first moment according to the parameter issuance request information sent by the PCF network element.
  • the first moment may be the moment when the V2X parameter is requested carried in the parameter issuance request information, or it may be based on the parameters.
  • the user data management network element may also use the time when the V2X parameter information is updated as the second time.
  • the user data management network element compares the obtained first time and second time respectively, and determines that the V2X parameters need to be updated according to the first time and the second time. For example, the V2X parameters are determined when the first time and the second time meet the preset conditions Need to be updated. For example, when the first time and the second time are not equal, the user data management network element determines that the V2X parameters need to be updated.
  • the embodiments of the present application also provide a communication method executed by a PCF network element, which mainly includes the following steps:
  • the PCF network element sends parameter delivery request information to the user data management network element, and the parameter delivery request information is used to request the user data management network element for V2X parameters of the terminal device.
  • the PCF network element receives the V2X parameters sent by the user data management network element.
  • the PCF network element when the PCF network element needs to provide V2X parameters to the terminal device, the PCF network element will trigger the process of obtaining the V2X parameters from the user data management network element. Specifically, the PCF network element requests the V2X parameters from the user data management network element, and the user data The management network element sends a response message to the PCF network element, and the message contains V2X parameters.
  • the parameter issuance request information carries the time when the PCF network element requests the V2X parameters; or,
  • the parameter issuance request information requests the user data management network element to obtain the time when the parameter issuance request message is received.
  • the user data management network element may determine the first moment according to the parameter issuance request information sent by the PCF network element.
  • the first moment may be the moment when the V2X parameter is requested in the parameter issuance request information, or it may be based on the parameter
  • the instruction to deliver the request information records the moment of receiving the parameter delivery request message.
  • the user data management network element may determine whether the V2X parameter is updated according to the first time determined from the parameter delivery request information and the second time when the user data management network element updates the V2X parameter.
  • the user data management network element sends parameter update indication information to the MME, where the parameter update indication information is used to indicate that the V2X parameter of the terminal device is updated.
  • the user data management network element may send parameter update indication information to the MME.
  • the parameter update indication information sent by the user data management network element is used to indicate that the V2X parameter of the terminal device is updated.
  • the MME receives parameter update indication information sent by the user data management network element, where the parameter update indication information is used to indicate that the V2X parameter of the terminal device is updated.
  • the MME when the user data management network element performs the aforementioned step 802, the MME receives the parameter update instruction information sent by the user data management network element, and the MME that receives the parameter update instruction information can determine: terminal equipment
  • the V2X parameters are updated.
  • the user data management network element may be HHS.
  • the parameter update indication information is that the user data management network element sends the user data management network element to the MME in response to the terminal device being unreachable or deregistered, or the V2X parameter stored by the user data management network element changes.
  • the terminal device when the terminal device is in an unreachable state, it is determined that the V2X parameters of the terminal device need to be updated. For another example, when the terminal device is in the unregistered state, it is determined that the V2X parameters of the terminal device need to be updated.
  • the V2X parameters stored in the user data management network element change, for example, the user's subscription data changes.
  • the user's previous subscription information includes value-added services, contains multiple operator networks, and can support comparison The maximum PC5 interface transmission rate is high, but the user cancels the value-added service for some reasons, and the maximum PC5 interface transmission rate is reduced.
  • the user's previous subscription information supports PC5 communication in the networks of multiple operators, but due to changes in the subscription information, the supported operators have changed. Or, the V2X parameters have expired.
  • the MME instructs the terminal device to obtain updated V2X parameters according to the parameter update indication information.
  • the MME determines from the indication carried in the parameter update indication information that the V2X parameters are updated, and the MME can send the updated V2X parameters to the terminal device so that the terminal device can obtain it in time Up to the updated V2X parameters, the terminal device can use the updated V2X parameters to communicate, thereby solving the problem of communication failure caused by the terminal device using expired V2X parameters.
  • the MME instructs the terminal device to obtain the updated V2X parameters in multiple implementation manners.
  • the MME can obtain the updated V2X parameters and then send them to the terminal device, that is, the MME can directly send the updated V2X parameters to the terminal device.
  • the MME may send instruction information to instruct the terminal device to communicate with the V2X control network element.
  • the MME may only send instruction information to the terminal device to instruct the terminal device to connect via PDN, and the terminal device can obtain updated V2X parameters from the V2XCF .
  • the communication method provided in the embodiments of the present application may further include the following steps:
  • the MME obtains the updated V2X parameters from the user data management network element.
  • the user data management network element can update the V2X parameters and store the updated V2X parameters, and the user data management network element can interact with the MME to provide the updated V2X parameters to the MME.
  • the MME receives the parameter update indication information sent by the user data management network element, and the parameter update indication information is used to indicate that the V2X parameter of the terminal device is updated.
  • the V2X control network element sends the updated V2X parameters to the terminal equipment.
  • the MME can receive parameter update indication information from the user data management network element, and the MME can send the updated V2X parameters to the terminal device according to the received indication information, so the terminal device can obtain the updated V2X parameter from the MME V2X parameters, terminal devices can use the updated V2X parameters to communicate, thereby solving the problem of communication failures caused by terminal devices using expired V2X parameters.
  • FIG. 9 is a schematic diagram of the interaction process of the communication method provided in an embodiment of the present application in an interaction scenario.
  • V2XCF the V2X control network element
  • the terminal device as the UE
  • UDM+HSS the user data management network element
  • UDR the UDR
  • the UE registers with the core network in the 5G communication system.
  • the UE can be registered to the core network in the 5G system, and the specific registration process will not be repeated.
  • the PCF sends V2X parameters to the UE.
  • PCF When PCF needs to provide V2X parameters to UE, PCF will trigger the process of obtaining V2X parameters from UDM+HSS/UDR. Specifically, PCF requests V2X parameters from UDM+HSS and UDR, and UDM+HSS/UDR sends a response message to PCF. The message contains V2X parameters.
  • UDM+HSS/UDR determines that the V2X parameters are updated.
  • the V2X parameters of the UE change, for example, the subscription information of the UE changes.
  • This information may be the subscription information stored in UDM+HSS/UDR.
  • UDM+HSS/UDR records the information "parameters need to be updated on the UE side", which can be specifically: UDM+HSS/UDR records the time information when it updates the UE parameters, compares the time when the parameters are sent to the UE, and updates At the moment of UE parameters, it is determined that the parameters on the UE side need to be updated. Or, when the parameters of the UE need to be updated, UDM+HSS/UDR finds that the UE is unreachable at this time, and UDM+HSS/UDR determines that the parameters on the UE side need to be updated.
  • the UE registers with the EPC.
  • the MME obtains V2X parameters (including update instructions).
  • the UE is then attached to the EPC.
  • the MME needs to obtain the parameters from the HSS, so that UDM+HSS/UDR learns that the UE parameters need to be updated.
  • the MMME obtains the UE's subscription information in the EPC, and UDM+HSS/UDR sends a message to the MME at this time.
  • the message includes indication information indicating that the stored V2X parameters of the UE need to be updated.
  • the UE receives an attach accept message (including an update instruction).
  • the MME may include the indication information sent by UDM+HSS/UDR in the non-access stratum (NAS) message sent to the UE, and this indication information may be included in the subscription information of the UE.
  • NAS non-access stratum
  • the V2XCF performs parameter interaction with the UE.
  • the embodiment of the present application provides a method for including the update information of the UE in the subscription information.
  • the MME sends information to the UE through the NAS message to inform the UE that it needs to trigger the interaction process with the V2XCF.
  • NAS messages are used to carry V2X parameters, which is relatively simple to implement, and does not require V2XCF to trigger processes such as Device trigger.
  • An embodiment of the present application provides a communication device, the communication device is a vehicle to all V2X control network elements, including at least one processor, the at least one processor is used to couple with a memory, read and execute the Instructions to implement the communication method performed by the aforementioned V2X control network element.
  • the communication device further includes: the memory.
  • An embodiment of the present application provides another communication device.
  • the communication device is a user data management network element and includes at least one processor configured to couple with a memory, read and execute instructions in the memory, In order to realize the communication method performed by the aforementioned user data management network element.
  • the communication device further includes: the memory.
  • An embodiment of the present application provides another communication device.
  • the communication device is a PCF network element with a policy control function, and includes at least one processor configured to couple with a memory and read and execute instructions in the memory. , In order to realize the communication method performed by the aforementioned PCF network element.
  • the communication device further includes: the memory.
  • An embodiment of the present application further provides a computer storage medium, wherein the computer storage medium stores a program, and the program executes a part or all of the steps recorded in the foregoing method embodiment.
  • the V2X control network element 1000 includes a processor 1003.
  • the V2X control network element 1000 further includes: a memory 1004.
  • the memory 1004 further includes: a receiver 1001 and a transmitter 1002.
  • the number of processors 1003 in the V2X control network element 1000 may be one or more.
  • One processor is taken as an example in FIG. 10.
  • the receiver 1001, the transmitter 1002, the processor 1003, and the memory 1004 may be connected by a bus or in other ways, where the bus connection is taken as an example in FIG. 10.
  • the memory 1004 may include a read-only memory and a random access memory, and provides instructions and data to the processor 1003. A part of the memory 1004 may also include a non-volatile random access memory (NVRAM).
  • NVRAM non-volatile random access memory
  • the memory 1004 stores an operating system and operating instructions, executable modules or data structures, or a subset of them, or an extended set of them, where the operating instructions may include various operating instructions for implementing various operations.
  • the operating system may include various system programs for implementing various basic services and processing hardware-based tasks.
  • the processor 1003 controls the operation of the V2X control network element 1000, and the processor 1003 may also be referred to as a central processing unit (CPU).
  • the various components of the V2X control network element 1000 are coupled together through a bus system, where the bus system may include a power bus, a control bus, and a status signal bus in addition to a data bus.
  • bus system may include a power bus, a control bus, and a status signal bus in addition to a data bus.
  • various buses are referred to as bus systems in the figure.
  • the methods disclosed in the foregoing embodiments of the present application may be applied to the processor 1003 or implemented by the processor 1003.
  • the processor 1003 may be an integrated circuit chip with signal processing capability. In the implementation process, the steps of the foregoing method can be completed by an integrated logic circuit of hardware in the processor 1003 or instructions in the form of software.
  • the aforementioned processor 1003 may be a general-purpose processor, a digital signal processing (digital signal processing, DSP), an application specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or Other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components.
  • DSP digital signal processing
  • ASIC application specific integrated circuit
  • FPGA field-programmable gate array
  • Other programmable logic devices discrete gates or transistor logic devices, discrete hardware components.
  • the general-purpose processor may be a microprocessor or the processor may also be any conventional processor or the like.
  • the steps of the method disclosed in the embodiments of the present application may be directly embodied as being executed and completed by a hardware decoding processor, or executed and completed by a combination of hardware and software modules in the decoding processor.
  • the software module can be located in a mature storage medium in the field such as random access memory, flash memory, read-only memory, programmable read-only memory, or electrically erasable programmable memory, registers.
  • the storage medium is located in the memory 1004, and the processor 1003 reads information in the memory 1004, and completes the steps of the foregoing method in combination with its hardware.
  • the receiver 1001 can be used to receive input digital or character information, and to generate signal input related to the related settings and function control of the V2X control network element 1000.
  • the transmitter 1002 can include display devices such as a display screen.
  • the transmitter 1002 can be used to connect The interface outputs digital or character information.
  • the processor 1003 is configured to execute the aforementioned communication method executed by the V2X control network element.
  • the user data management network element 1100 includes a processor 1103.
  • the user data management network element 1100 further includes: a memory 1104.
  • the user data management network element 1100 further includes a receiver 1101 and a transmitter 1102.
  • the number of processors 1103 in the user data management network element 1100 may be one or more.
  • One processor is taken as an example in FIG. 11.
  • the receiver 1101, the transmitter 1102, the processor 1103, and the memory 1104 may be connected by a bus or in other ways. In FIG. 11, a bus connection is taken as an example.
  • the memory 1104 may include a read-only memory and a random access memory, and provides instructions and data to the processor 1103. A part of the memory 1104 may also include NVRAM.
  • the memory 1104 stores an operating system and operating instructions, executable modules or data structures, or a subset of them, or an extended set of them, where the operating instructions may include various operating instructions for implementing various operations.
  • the operating system may include various system programs for implementing various basic services and processing hardware-based tasks.
  • the processor 1103 controls the operation of the user data management network element, and the processor 1103 may also be referred to as a CPU.
  • the various components of the user data management network element are coupled together through a bus system, where the bus system may include a power bus, a control bus, and a status signal bus in addition to a data bus.
  • bus system may include a power bus, a control bus, and a status signal bus in addition to a data bus.
  • various buses are referred to as bus systems in the figure.
  • the method disclosed in the foregoing embodiment of the present application may be applied to the processor 1103 or implemented by the processor 1103.
  • the processor 1103 may be an integrated circuit chip with signal processing capabilities. In the implementation process, the steps of the foregoing method can be completed by hardware integrated logic circuits in the processor 1103 or instructions in the form of software.
  • the aforementioned processor 1103 may be a general-purpose processor, DSP, ASIC, FPGA or other programmable logic device, discrete gate or transistor logic device, or discrete hardware component.
  • the methods, steps, and logical block diagrams disclosed in the embodiments of the present application can be implemented or executed.
  • the general-purpose processor may be a microprocessor or the processor may also be any conventional processor or the like.
  • the steps of the method disclosed in the embodiments of the present application may be directly embodied as being executed and completed by a hardware decoding processor, or executed and completed by a combination of hardware and software modules in the decoding processor.
  • the software module can be located in a mature storage medium in the field such as random access memory, flash memory, read-only memory, programmable read-only memory, or electrically erasable programmable memory, registers.
  • the storage medium is located in the memory 1104, and the processor 1103 reads the information in the memory 1104, and completes the steps of the foregoing method in combination with its hardware.
  • the processor 1103 is configured to execute the aforementioned communication method executed by the user data management network element.
  • the PCF network element 1200 includes a processor 1203.
  • the PCF network element 1200 further includes: a memory 1204.
  • the PCF network element 1200 further includes: a receiver 1201 and a transmitter 1202.
  • the number of processors 1203 in the PCF network element 1200 may be one or more, and one processor is taken as an example in FIG. 12.
  • the receiver 1201, the transmitter 1202, the processor 1203, and the memory 1204 may be connected by a bus or in other ways. In FIG. 12, a bus connection is taken as an example.
  • the memory 1204 may include a read-only memory and a random access memory, and provides instructions and data to the processor 1203. A part of the memory 1204 may also include NVRAM.
  • the memory 1204 stores an operating system and operating instructions, executable modules or data structures, or a subset of them, or an extended set of them, where the operating instructions may include various operating instructions for implementing various operations.
  • the operating system may include various system programs for implementing various basic services and processing hardware-based tasks.
  • the processor 1203 controls the operation of the PCF network element, and the processor 1203 may also be referred to as a CPU.
  • the various components of the PCF network element are coupled together through a bus system.
  • the bus system may also include a power bus, a control bus, and a status signal bus.
  • various buses are referred to as bus systems in the figure.
  • the method disclosed in the foregoing embodiment of the present application may be applied to the processor 1203 or implemented by the processor 1203.
  • the processor 1203 may be an integrated circuit chip with signal processing capability. In the implementation process, the steps of the foregoing method can be completed by hardware integrated logic circuits in the processor 1203 or instructions in the form of software.
  • the aforementioned processor 1203 may be a general-purpose processor, DSP, ASIC, FPGA or other programmable logic device, discrete gate or transistor logic device, or discrete hardware component.
  • the methods, steps, and logical block diagrams disclosed in the embodiments of the present application can be implemented or executed.
  • the general-purpose processor may be a microprocessor or the processor may also be any conventional processor or the like.
  • Combining the steps of the method disclosed in the embodiments of the present application may be directly embodied as being executed and completed by a hardware decoding processor, or executed and completed by a combination of hardware and software modules in the decoding processor.
  • the software module can be located in a mature storage medium in the field such as random access memory, flash memory, read-only memory, programmable read-only memory, or electrically erasable programmable memory, registers.
  • the storage medium is located in the memory 1204, and the processor 1203 reads the information in the memory 1204, and completes the steps of the above method in combination with its hardware.
  • the processor 1203 is configured to execute the aforementioned communication method executed by the PCF network element.
  • the chip when the V2X control network element, the user data management network element, and the PCF network element are chips in the server, the chip includes a processing unit and a communication unit.
  • the processing unit may be a processor, for example,
  • the communication unit may be, for example, an input/output interface, a pin, or a circuit.
  • the processing unit can execute the computer-executable instructions stored in the storage unit, so that the chip in the terminal executes the wireless communication method of any one of the foregoing first aspect.
  • the storage unit is a storage unit in the chip, such as a register, a cache, etc., and the storage unit may also be a storage unit in the terminal located outside the chip, such as a read-only memory (read-only memory). -only memory (ROM) or other types of static storage devices that can store static information and instructions, random access memory (RAM), etc.
  • the processor mentioned in any of the foregoing may be a general-purpose central processing unit, a microprocessor, an ASIC, or one or more integrated circuits for controlling the execution of the program of the method of the first aspect.
  • the device embodiments described above are merely illustrative, and the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physically separate
  • the physical unit can be located in one place or distributed across multiple network units. Some or all of the modules may be selected according to actual needs to achieve the objectives of the solutions of the embodiments.
  • the connection relationship between the modules indicates that they have a communication connection between them, which can be specifically implemented as one or more communication buses or signal lines.
  • this application can be implemented by means of software plus necessary general hardware.
  • it can also be implemented by dedicated hardware including dedicated integrated circuits, dedicated CPUs, dedicated memory, Dedicated components and so on to achieve.
  • all functions completed by computer programs can be easily implemented with corresponding hardware.
  • the specific hardware structure used to achieve the same function can also be diverse, such as analog circuits, digital circuits or dedicated Circuit etc.
  • software program implementation is a better implementation in more cases.
  • the technical solution of this application essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product is stored in a readable storage medium, such as a computer floppy disk. , U disk, mobile hard disk, ROM, RAM, magnetic disk or optical disk, etc., including several instructions to make a computer device (which can be a personal computer, server, or network device, etc.) execute the methods described in each embodiment of this application .
  • a computer device which can be a personal computer, server, or network device, etc.
  • the computer program product includes one or more computer instructions.
  • the computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices.
  • the computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium.
  • the computer instructions may be transmitted from a website, computer, server, or data center. Transmission to another website site, computer, server or data center via wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.).
  • wired such as coaxial cable, optical fiber, digital subscriber line (DSL)
  • wireless such as infrared, wireless, microwave, etc.
  • the computer-readable storage medium may be any available medium that can be stored by a computer or a data storage device such as a server or data center integrated with one or more available media.
  • the usable medium may be a magnetic medium (for example, a floppy disk, a hard disk, a magnetic tape), an optical medium (for example, a DVD), or a semiconductor medium (for example, a solid state disk (SSD)), etc.

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Abstract

本申请公开一种通信方法和通信装置以及系统，应用于车辆到所有V2X领域中，可使得终端设备获取更新后的V2X参数，解决终端设备使用过期V2X参数导致通信失败的问题。所述通信方法包括：V2X控制网元接收用户数据管理网元发送的参数更新指示信息，所述参数更新指示信息用于指示终端设备的V2X参数发生更新；所述V2X控制网元根据所述参数更新指示信息，向终端设备发送更新后的V2X参数。

Description

一种通信方法和通信装置以及系统
本申请要求于2019年5月6日提交中国专利局、申请号为201910372922.8、发明名称为“一种通信方法和通信装置以及系统”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
本申请涉及无线通信技术领域，尤其涉及一种通信方法和通信装置以及系统。
背景技术
在目前的车辆到所有(vehicle to everything，V2X)提供了设备到设备(device to device，D2D)直接通信和基站中转通信两种通信技术。其中的D2D直接通信技术允许用户设备(user equipment，UE)间通过PC5接口直接进行通信，其传输时延相对较低且配置资源较少。基站中转通信技术通过Uu接口进行通信，可靠性较高。
V2X场景有两种：一种V2X场景是基于蜂窝网络覆盖的场景，蜂窝网络包括但不限于：第五代(5Generation，5G)通信系统和第四代(4Generation，4G)通信系统，此时既可以由蜂窝网络的Uu接口提供服务，实现大带宽、大覆盖通信，也可以通过PC5接口提供服务，实现车辆与周边环境节点进行低时延、高可靠的直接通信；另一种V2X场景是独立于蜂窝网络的场景，在无网络部署的区域通过PC5接口提供车联网道路服务，满足行车安全需求。在有蜂窝网络覆盖的场景下，数据传输可以在Uu接口和PC5接口之间进行灵活的无缝切换。
在5G通信系统中，策略控制功能(policy control function，PCF)网元向用户设备(user equipment，UE)提供V2X参数，该V2X参数可用于PC5接口的通信。其中，PCF发送的V2X参数可以包括：在5G通信系统中使用的参数，以及在4G通信系统中使用的参数。
在4G通信系统中，UE向V2X控制功能(V2X control function，V2XCF)网元发送请求，V2XCF网元向UE提供V2X参数。例如，由UE主动发起该UE与V2XCF关联关系的建立，然后V2XCF向UE发送V2X参数。
在V2X场景下，如果UE在5G通信系统中已经获取了4G通信系统中使用的V2X参数，当UE移动到4G通信系统时，UE不会再次触发获取V2X参数的流程，当UE尝试与4G通信系统中的无线接入网(radio access network，RAN)进行通信时，UE仍使用在5G通信系统中获取到的用于4G通信系统的V2X参数，因此会导致UE通信失败。
发明内容
本申请实施例提供了一种通信方法和通信装置以及系统，用于使得终端设备获取更新后的V2X参数，解决终端设备使用过期V2X参数导致通信失败的问题。
为解决上述技术问题，本申请实施例提供以下技术方案：
第一方面，本申请实施例提供一种通信方法，包括：车辆到所有V2X控制网元接收用 户数据管理网元发送的参数更新指示信息，所述参数更新指示信息用于指示终端设备的V2X参数发生更新；所述V2X控制网元根据所述参数更新指示信息，向所述终端设备发送更新后的V2X参数。在本申请实施例中，中V2X控制网元可以从用户数据管理网元接收到参数更新指示信息，V2X控制网元根据接收到的指示信息就可以向终端设备发送更新后的V2X参数，因此终端设备可以从V2X控制网元获取到更新后的V2X参数，终端设备可以使用更新后的V2X参数进行通信，从而解决了终端设备使用过期V2X参数导致通信失败的问题。
在一种可能的实现方式中，所述方法还包括：所述V2X控制网元从所述用户数据管理网元获取更新后的V2X参数。其中，用户数据管理网元可以更新V2X参数，并存储更新后的V2X参数，用户数据管理网元可以和V2X控制网元进行交互，以向V2X控制网元提供更新后的V2X参数。用户数据管理网元发送更新后的V2X参数可以和用户数据管理网元发送参数更新通知信息在一条消息中发送的，也可以是在参数更新通知信息发送之前或者发送之后发送更新后的V2X参数，此处不做限定。
在一种可能的实现方式中，所述参数更新指示信息还用于指示所述终端设备在第一网络可达，其中，所述V2X控制网元为所述第一网络中的网元。具体的，所述用户数据管理网元向所述V2X控制网元发送参数更新通知信息，所述参数更新通知信息用于通知所述V2X控制网元所述终端设备在第一网络可达，V2X控制网元可以确定终端设备在第一网络可达。
在一种可能的实现方式中，所述终端设备在第一网络可达包括：所述终端设备在所述第一网络中注册。例如，终端设备在第一网络可达，具体地，可以包括终端设备注册至第一网络，用户数据管理网元在所述终端设备在第一网络可达时，向所述V2X控制网元发送参数更新通知信息。所述终端设备在第一网络可达包括所述终端设备在第一网络中注册。不限定的是，参数更新通知信息可以显式的指示终端设备从第二网络切换至第一网络，也可以仅指示终端设备接入到第一网络，由V2X控制网元根据接收到的参数更新通知信息确定终端设备的切换操作。
在一种可能的实现方式中，所述V2X参数包括如下至少一种：用于PC5接口通信的运营商网络PLMN列表；是否进行PC5接口通信的指示信息；用于PC5接口通信的无线资源配置参数；用于PC5接口通信的网络选择策略信息；V2X业务和终端设备的标识信息之间的映射关系。其中，V2X参数可以是HSS告知V2XCF的签约信息。用于PC5接口通信的运营商网络PLMN列表可以是UE在E-UTRA或NR覆盖下可以进行PC5接口通信的PLMN列表。是否进行PC5接口通信的指示信息是指UE不在E-UTRA并且不在NR覆盖下是否可以进行LTE PC5/NR PC5通信的信息，例如该指示信息可以占用1个比特，通过取值为0或1指示是否进行PC5通信。用于PC5接口通信的无线资源配置参数是指UE可以在“不在E-UTRA并且不在NR覆盖下”的条件下使用LTE PC5，或者NR PC5进行通信，其在通信时采用的具体的无线资源参数，例如该无线资源配置参数可以包含对应的地理位置信息，例如包含地理位置信息的列表。用于PC5接口通信的网络选择策略信息是指用于选择LTE PC5或NR PC5通信的选择策略信息，具体包括“V2X业务”和“对应PC5接口”的映射信息。针对NR PC5接口的通信，V2X参数还可以包括用于建立PC5单播连接以及用于PC5组播和广播通信的“V2X业务”和“对应标识信息”的映射关系。具体可以根据应用场景确定V2X参数所包括的内容，此处仅作说明，不作为对本申请实施例的限定。
第二方面，本申请实施例还提供一种通信方法，包括：用户数据管理网元确定终端设备的车辆到所有V2X参数发生更新；所述用户数据管理网元向V2X控制网元发送参数更新指示信息，所述参数更新指示信息用于指示所述终端设备的V2X参数发生更新。在本申请实施例中，V2X控制网元接收用户数据管理网元发送的参数更新指示信息，参数更新指示信息用于指示终端设备的V2X参数发生更新。V2X控制网元根据参数更新指示信息，向终端设备发送更新后的V2X参数。本申请实施例中V2X控制网元可以从用户数据管理网元接收到参数更新指示信息，V2X控制网元根据接收到的指示信息就可以向终端设备发送更新后的V2X参数，因此终端设备可以从V2X控制网元获取到更新后的V2X参数，终端设备可以使用更新后的V2X参数进行通信，从而解决了终端设备使用过期V2X参数导致通信失败的问题。
在一种可能的实现方式中，所述用户数据管理网元确定终端设备的车辆到所有V2X参数发生更新，包括：所述用户数据管理网元接收策略控制功能PCF网元发送的参数下发请求信息，所述参数下发请求信息用于向所述用户数据管理网元请求所述终端设备的V2X参数；所述用户数据管理网元根据所述参数下发请求信息确定第一时刻；所述用户数据管理网元更新所述终端设备的V2X参数，并获取更新V2X参数的第二时刻；所述用户数据管理网元根据所述第一时刻和所述第二时刻确定所述终端设备的V2X参数发生更新。其中，用户数据管理网元可以根据PCF网元发送的参数下发请求信息确定出第一时刻，该第一时刻可以根据参数下发请求信息确定出的时刻。用户数据管理网元还可以将更新V2X参数信息的时刻作为第二时刻。用户数据管理网元对比分别获取到的第一时刻和第二时刻，根据第一时刻和第二时刻确定V2X参数需要被更新，例如第一时刻和第二时刻满足预置的条件时确定V2X参数需要被更新。例如当第一时刻和第二时刻不相等时，用户数据管理网元确定V2X参数需要被更新。
在一种可能的实现方式中，所述第一时刻为所述参数下发请求信息中承载的请求时刻，或者，所述第一时刻为接收到所述参数下发请求信息的时刻。例如，该第一时刻可以是参数下发请求信息携带的请求V2X参数的时刻，还可以是按照参数下发请求信息的指示记录下的时刻。
在一种可能的实现方式中，所述用户数据管理网元确定终端设备的车辆到所有V2X参数发生更新，包括如下情况中的至少一种：所述用户数据管理网元确定所述终端设备为不可达状态时，确定所述V2X参数发生更新；所述用户数据管理网元确定所述终端设备为去注册状态时，确定所述V2X参数发生更新；所述用户数据管理网元确定所述用户数据管理网元存储的V2X参数发生变化时，确定所述V2X参数发生更新。其中，当终端设备为不可达状态时，确定终端设备的V2X参数需要更新。又如，当终端设备为去注册状态时，确定终端设备的V2X参数需要更新。又如，当用户数据管理网元存储的V2X参数发生变化时，例如，用户的签约数据发生改变，例如，用户之前签约的信息包括了增值业务，包含了多个运营商网络，并且可以支持较高的最大PC5接口传输速率，但用户基于某些原因取消了增值业务，进而最大PC5接口传输速率被降低。又例如，用户之前签约信息支持在多个运营商的网络中进行PC5通信，然而由于签约信息的变化，支持的运营商发生了改变。或者，V2X参数已经过期。用户数据管理网元基于上述举例的情况，可以准确的获知V2X参数发 生更新。
在一种可能的实现方式中，所述方法还包括：所述用户数据管理网元向所述V2X控制网元发送更新后的V2X参数。其中，用户数据管理网元可以更新V2X参数，并存储更新后的V2X参数，用户数据管理网元可以和V2X控制网元进行交互，以向V2X控制网元提供更新后的V2X参数。用户数据管理网元发送更新后的V2X参数可以和步骤412用户数据管理网元发送参数更新通知信息在一条消息中发送的，也可以是在参数更新通知信息发送之前或者发送之后发送更新后的V2X参数，此处不做限定。
第三方面，本申请实施例提供一种通信方法，包括：策略控制功能PCF网元向用户数据管理网元发送参数下发请求信息，所述参数下发请求信息用于向所述用户数据管理网元请求终端设备的V2X参数；所述PCF网元接收所述用户数据管理网元发送的所述V2X参数。本申请实施例中，当PCF网元需要向终端设备提供V2X参数时，PCF网元会触发向用户数据管理网元获取V2X参数的流程，具体的，PCF网元向用户数据管理网元请求V2X参数，用户数据管理网元向PCF网元发送响应消息，该响应消息包含V2X参数。用户数据管理网元根据PCF网元发送的参数下发请求信息可以确定PCF网元已经向终端设备发送了V2X参数。
在一种可能的实现方式中，所述参数下发请求信息携带所述PCF网元请求所述V2X参数的时刻信息；或者，所述参数下发请求信息用于指示所述用户数据管理网元记录接收到所述参数下发请求消息的时刻。具体的，用户数据管理网元可以根据PCF网元发送的参数下发请求信息确定出第一时刻，该第一时刻可以是参数下发请求信息携带的请求V2X参数的时刻，还可以是按照参数下发请求信息的指示记录下的接收参数下发请求消息的时刻。用户数据管理网元可以根据从参数下发请求信息确定出的第一时刻，以及该用户数据管理网元更新V2X参数的第二时刻来确定V2X参数是否发生更新。
第四方面，本申请实施例提供一种通信方法，包括：用户数据管理网元确定终端设备的车辆到所有V2X参数发生更新；所述用户数据管理网元向V2X控制网元发送参数更新指示信息，所述参数更新指示信息用于指示所述终端设备的V2X参数发生更新；所述V2X控制网元根据所述参数更新指示信息，向所述终端设备发送更新后的V2X参数。
在一种可能的实现方式中，所述方法还包括：所述V2X控制网元从所述用户数据管理网元获取到更新后的V2X参数。
在一种可能的实现方式中，所述用户数据管理网元确定终端设备的车辆到所有V2X参数发生更新，包括：所述用户数据管理网元接收策略控制功能PCF网元发送的参数下发请求信息，所述参数下发请求信息用于向所述用户数据管理网元请求所述终端设备的V2X参数；所述用户数据管理网元根据所述参数下发请求信息确定第一时刻；所述用户数据管理网元更新所述终端设备的V2X参数，并获取更新V2X参数的第二时刻；所述用户数据管理网元根据所述第一时刻和所述第二时刻确定所述V2X参数发生更新。
在一种可能的实现方式中，所述方法还包括：策略控制功能PCF网元向所述用户数据管理网元发送参数下发请求信息，所述参数下发请求信息用于向所述用户数据管理网元请求终端设备的V2X参数；所述用户数据管理网元接收所述参数下发请求信息，并根据所述参数下发请求信息向所述PCF网元发送所述终端设备的V2X参数；所述PCF网元接收所述 用户数据管理网元发送的所述终端设备的V2X参数。
第五方面，本申请实施例提供一种通信装置，所述通信装置为车辆到所有V2X控制网元，包括至少一个处理器，所述至少一个处理器用于与存储器耦合，读取并执行所述存储器中的指令，以实现如前述第一方面中任一项所述的方法。
在一种可能的实现方式中，所述通信装置还包括：所述存储器。
第六方面，本申请实施例提供一种通信装置，所述通信装置为用户数据管理网元，包括至少一个处理器，所述至少一个处理器用于与存储器耦合，读取并执行所述存储器中的指令，以实现如前述第二方面中任一项所述的方法。
在一种可能的实现方式中，所述通信装置还包括：所述存储器。
第七方面，本申请实施例提供一种通信装置，所述通信装置为策略控制功能PCF网元，包括至少一个处理器，所述至少一个处理器用于与存储器耦合，读取并执行所述存储器中的指令，以实现如前述第三方面中任一项所述的方法。
在一种可能的实现方式中，所述通信装置还包括：所述存储器。
在本申请的第五、第六、第七方面中，V2X控制网元、用户数据管理网元、PCF网元的组成模块还可以执行前述方法以及各种可能的实现方式中所描述的步骤，详见前述对方法以及各种可能的实现方式中的说明。
第八方面，本申请实施例提供一种通信系统，其特征在于，所述通信系统包括：如第五方面中任一项所述的车辆到所有V2X控制网元、如第六方面中任一项所述的用户数据管理网元。
在一种可能的实现方式中，所述通信系统还包括：如第七方面中任一项所述的策略控制功能PCF网元。
第九方面，本申请实施例提供一种通信方法，包括：车辆到所有V2X控制网元接收策略控制功能PCF网元发送的参数下发通知信息，所述参数下发通知信息用于通知所述V2X控制网元所述PCF网元向终端设备发送V2X参数；所述V2X控制网元接收用户数据管理网元发送的参数更新通知信息，所述参数更新通知信息用于通知所述V2X控制网元V2X参数的更新；所述V2X控制网元根据所述参数下发通知信息和所述参数更新通知信息，向所述终端设备发送更新后的V2X参数。在本申请实施例中，V2X控制网元可以从PCF接收到的参数下发通知信息，还可以从用户数据管理网元接收到参数更新通知信息，V2X控制网元根据接收到的两种通知信息就可以向终端设备发送更新后的V2X参数，因此终端设备可以从V2X控制网元获取到更新后的V2X参数，终端设备可以使用更新后的V2X参数进行通信，从而解决了终端设备使用过期V2X参数导致通信失败的问题。
在一种可能的实现方式中，所述V2X控制网元根据所述参数下发通知信息和所述参数更新通知信息，向所述终端设备发送更新后的V2X参数，包括：所述V2X控制网元根据所述参数下发通知信息和所述参数更新通知信息确定所述V2X参数需要被更新，并向所述终端设备发送所述更新后的V2X参数。其中，V2X控制网元分别接收到参数下发通知信息和参数更新通知信息之后，V2X控制网元可以根据参数下发通知信息所通知的内容以及参数更新通知信息所通知的内容进行对比分析，V2X控制网元可以确定终端设备的V2X参数需要被更新，V2X参数需要被更新指的是终端设备上使用的V2X参数已经发生变化，需要对 该V2X参数进行更新。V2X控制网元响应于V2X参数需要被更新，可以向终端设备发送更新后的V2X参数，从而使得终端设备可以及时获取到更新后的V2X参数。
在一种可能的实现方式中，所述V2X控制网元根据所述参数下发通知信息和所述参数更新通知信息确定所述V2X参数需要被更新，包括：所述V2X控制网元根据所述参数下发通知信息确定第一时刻，以及根据所述参数更新通知信息确定第二时刻；所述V2X控制网元根据所述第一时刻和所述第二时刻确定所述V2X参数需要被更新。
在一种可能的实现方式中，所述第一时刻为所述参数下发通知信息承载的发送V2X参数的时刻，或者，所述第一时刻为接收到所述参数下发通知信息的时刻；所述第二时刻为所述参数更新通知信息承载的更新V2X参数的时刻，或者，所述第二时刻为接收到所述参数更新通知信息的时刻。其中，V2X控制网元可以根据PCF网元发送的参数下发通知信息确定出第一时刻，该第一时刻可以是参数下发通知信息携带的发送V2X参数的时刻，还可以是按照参数下发通知信息的指示记录下的时刻。V2X控制网元还可以根据用户数据管理网元发送的参数更新通知信息确定出第二时刻，该第二时刻可以是参数更新通知信息携带的更新V2X参数的时刻，还可以是按照参数更新通知信息的指示记录下的时刻。V2X控制网元对比分别获取到的第一时刻和第二时刻，V2X控制网元根据第一时刻和第二时刻确定V2X参数需要被更新，例如第一时刻和第二时刻满足预置的条件时确定V2X参数需要被更新。例如当第一时刻和第二时刻不相等时，V2X控制网元确定V2X参数需要被更新。
在一种可能的实现方式中，所述方法还包括：所述V2X控制网元从所述用户数据管理网元获取更新后的V2X参数。其中，用户数据管理网元可以更新V2X参数，并存储更新后的V2X参数，用户数据管理网元可以和V2X控制网元进行交互，以向V2X控制网元提供更新后的V2X参数。用户数据管理网元发送更新后的V2X参数可以和步骤412用户数据管理网元发送参数更新通知信息在一条消息中发送的，也可以是在参数更新通知信息发送之前或者发送之后发送更新后的V2X参数，此处不做限定。
在一种可能的实现方式中，所述V2X控制网元接收策略控制功能PCF网元发送的参数下发通知信息，包括：所述V2X控制网元通过网络开放功能NEF网元接收所述PCF网元发送的所述参数下发通知信息。用户数据管理网元和V2X控制网元之间可以通过NEF网元来完成，例如用户数据管理网元首先生成参数更新通知信息，然后向NEF网元发送参数更新通知信息，NEF网元接收到参数更新通知信息之后，NEF网元可以向V2X控制网元发送参数更新通知信息，从而使得V2X控制网元可以通过NEF网元从用户数据管理网元获取到参数更新通知信息。
在一种可能的实现方式中，所述参数更新通知信息还用于指示所述终端设备在第一网络可达，其中，所述V2X控制网元为所述第一网络中的网元。具体的，所述用户数据管理网元向所述V2X控制网元发送参数更新通知信息，所述参数更新通知信息用于通知所述V2X控制网元所述终端设备在第一网络可达，V2X控制网元可以确定终端设备在第一网络可达。
在一种可能的实现方式中，所述终端设备在第一网络可达包括：所述终端设备在所述第一网络中注册。例如，终端设备在第一网络可达，具体地，可以包括终端设备注册至第一网络，用户数据管理网元在所述终端设备在第一网络可达时，向所述V2X控制网元发送参数更新通知信息。所述终端设备在第一网络可达包括所述终端设备在第一网络中注册。
第十方面，本申请实施例提供一种通信方法，包括：用户数据管理网元更新终端设备的车辆到所有V2X参数；所述用户数据管理网元向V2X控制网元发送参数更新通知信息，所述参数更新通知信息用于通知所述终端设备的V2X参数更新。在本申请实施例中，V2X控制网元可以从PCF接收到的参数下发通知信息，还可以从用户数据管理网元接收到参数更新通知信息，V2X控制网元根据接收到的两种通知信息就可以向终端设备发送更新后的V2X参数，因此终端设备可以从V2X控制网元获取到更新后的V2X参数，终端设备可以使用更新后的V2X参数进行通信，从而解决了终端设备使用过期V2X参数导致通信失败的问题。
在一种可能的实现方式中，所述用户数据管理网元更新终端设备的车辆到所有V2X参数，包括如下情况中的至少一种：所述用户数据管理网元确定所述终端设备为不可达状态时，确定所述V2X参数发生更新；所述用户数据管理网元确定所述终端设备为去注册状态时，确定所述V2X参数发生更新；所述用户数据管理网元确定所述用户数据管理网元存储的V2X参数发生变化时，确定所述V2X参数发生更新。
在一种可能的实现方式中，所述参数更新通知信息携带所述用户数据管理网元对所述V2X参数进行更新的时刻信息；或者，所述参数更新通知信息指示所述V2X控制网元记录接收到所述参数更新通知消息的时刻。PCF网元发送V2X参数的时刻指的是PCF网元向终端设备发送V2X参数的时刻，V2X参数的时刻可以包含PCF网元向终端设备发送用于4G通信系统的V2X参数的时刻，该V2X参数可以包括：用于4G通信系统的V2X参数。例如PCF网元发送V2X参数的时刻可以是一个时间戳，当V2X控制网元接收到参数下发通知信息时，V2X控制网元可以获取到PCF网元向终端设备发送V2X参数的时刻。
在一种可能的实现方式中，参数更新通知信息还用于指示所述终端设备在第一网络可达。具体的，所述用户数据管理网元向所述V2X控制网元发送参数更新通知信息，所述参数更新通知信息用于通知所述V2X控制网元所述终端设备在第一网络可达，V2X控制网元可以确定终端设备在第一网络可达。
在一种可能的实现方式中，所述终端设备在第一网络可达包括：所述终端设备成功注册到所述第一网络中。例如，终端设备在第一网络可达，具体地，可以包括终端设备注册至第一网络，用户数据管理网元在所述终端设备在第一网络可达时，向所述V2X控制网元发送参数更新通知信息。所述终端设备在第一网络可达包括所述终端设备在第一网络中注册。
在一种可能的实现方式中，所述V2X参数包括如下至少一种：用于PC5接口通信的运营商网络PLMN列表；是否进行PC5接口通信的指示信息；用于PC5接口通信的无线资源配置参数；用于PC5接口通信的网络选择策略信息；V2X业务和终端设备的标识信息之间的映射关系。
第十一方面，本申请实施例提供一种通信方法，包括：策略控制功能PCF网元向终端设备发送车辆到所有V2X参数；所述PCF网元向V2X控制网元发送参数下发通知信息，所述参数下发通知信息用于通知所述V2X控制网元所述PCF网元向所述终端设备发送所述V2X参数。在本申请实施例中，V2X控制网元可以从PCF接收到的参数下发通知信息，还可以从用户数据管理网元接收到参数更新通知信息，V2X控制网元根据接收到的两种通知信息 就可以向终端设备发送更新后的V2X参数，因此终端设备可以从V2X控制网元获取到更新后的V2X参数，终端设备可以使用更新后的V2X参数进行通信，从而解决了终端设备使用过期V2X参数导致通信失败的问题。
在一种可能的实现方式中，所述参数下发通知信息携带所述PCF网元发送所述V2X参数的时刻；或者，所述参数下发通知信息用于指示所述V2X控制网元记录接收到所述参数下发通知消息的时刻。
在一种可能的实现方式中，所述PCF网元向V2X控制网元发送参数下发通知信息，包括：所述PCF网元通过网络开放功能NEF网元向所述V2X控制网元发送所述参数下发通知信息。PCF网元和V2X控制网元之间可以通过NEF网元来完成，例如PCF网元首先生成参数下发通知信息，然后向NEF网元发送参数下发通知信息，NEF网元接收到参数下发通知信息之后，NEF网元可以向V2X控制网元发送参数下发通知信息，从而使得V2X控制网元可以通过NEF网元从PCF网元获取到参数下发通知信息。
第十二方面，本申请实施例提供一种通信装置，其特征在于，所述通信装置为车辆到所有V2X控制网元，包括至少一个处理器，所述至少一个处理器用于与存储器耦合，读取并执行所述存储器中的指令，以实现如第九方面中任一项所述的方法。
在一种可能的实现方式中，所述通信装置还包括：所述存储器。
第十三方面，本申请实施例提供一种通信装置，所述通信装置为用户数据管理网元，包括至少一个处理器，所述至少一个处理器用于与存储器耦合，读取并执行所述存储器中的指令，以实现如第十方面中任一项所述的方法。
在一种可能的实现方式中，所述通信装置还包括：所述存储器。
第十四方面，本申请实施例提供一种通信装置，所述通信装置为策略控制功能PCF网元，包括至少一个处理器，所述至少一个处理器用于与存储器耦合，读取并执行所述存储器中的指令，以实现如第十一方面中任一项所述的方法。
在一种可能的实现方式中，所述通信装置还包括：所述存储器。
第十五方面，本申请实施例提供一种通信系统，所述通信系统包括：如第十二方面中任一项所述的车辆到所有V2X控制网元、如第十三方面中任一项所述的用户数据管理网元，和如第十四方面中任一项所述的策略控制功能PCF网元。
第十六方面，本申请实施例提供了一种计算机可读存储介质，所述计算机可读存储介质中存储有指令，当其在计算机上运行时，使得计算机执行上述第一方面至第四方面，第九方面至第十一方面所述的方法。
第十七方面，本申请实施例提供了一种包含指令的计算机程序产品，当其在计算机上运行时，使得计算机执行上述第一方面至第四方面，第九方面至第十一方面所述的方法。
第十八方面，本申请提供了一种芯片系统，该芯片系统包括处理器，用于支持前述的V2X控制网元、用户数据管理网元、PCF网元实现上述方面中所涉及的功能，例如，发送或处理上述方法中所涉及的数据和/或信息。在一种可能的设计中，所述芯片系统还包括存储器，所述存储器，用于保存前述的V2X控制网元、用户数据管理网元、PCF网元必要的程序指令和数据。该芯片系统，可以由芯片构成，也可以包括芯片和其他分立器件。
附图说明
图1为本申请实施例提供的一种通信系统的组成架构示意图；
图2为本申请实施例提供的一种4G通信系统和5G通信系统相结合的架构示意图；
图3为本申请实施例提供的通信系统内网元之间的通信架构示意图；
图4为本申请实施例提供的V2X控制网元、用户数据管理网元和PCF网元之间的一种交互流程示意图；
图5为本申请实施例提供的通信方法在一种交互场景下的交互流程示意图；
图6为本申请实施例提供的V2X控制网元和用户数据管理网元之间的另一种交互流程示意图；
图7a为本申请实施例提供的通信方法在另一种交互场景下的交互流程示意图；
图7b为本申请实施例提供的通信方法在另一种交互场景下的交互流程示意图；
图8为本申请实施例提供的用户数据管理网元和MME之间的另一种交互流程示意图；
图9为本申请实施例提供的通信方法在另一种交互场景下的交互流程示意图；
图10为本申请实施例提供的一种V2X控制网元的组成结构示意图；
图11为本申请实施例提供的一种用户数据管理网元的组成结构示意图；
图12为本申请实施例提供的一种PCF网元的组成结构示意图。
具体实施方式
本申请实施例提供了一种通信方法和通信装置以及系统，用于使得终端设备获取更新后的V2X参数，解决终端设备使用过期V2X参数导致通信失败的问题。
下面结合附图，对本申请的实施例进行描述。
本申请的说明书和权利要求书及上述附图中的术语“第一”、“第二”等是用于区别类似的对象，而不必用于描述特定的顺序或先后次序。应该理解这样使用的术语在适当情况下可以互换，这仅仅是描述本申请的实施例中对相同属性的对象在描述时所采用的区分方式。此外，术语“包括”和“具有”以及他们的任何变形，意图在于覆盖不排他的包含，以便包含一系列单元的过程、方法、系统、产品或设备不必限于那些单元，而是可包括没有清楚地列出的或对于这些过程、方法、产品或设备固有的其它单元。
本申请实施例的技术方案可以应用于各种数据处理的通信系统，例如3GPP在长期演进(long term evolution，LTE)和基于LTE演进的各种版本是使用E-UTRA的UMTS的新版本。第五代(5 Generation，简称：“5G”)通信系统、新空口(New Radio，简称“NR”)是正在研究当中的下一代通信系统。此外，所述通信系统还可以适用于面向未来的通信技术，都适用本申请实施例提供的技术方案。本申请实施例描述的系统架构以及业务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。
图1示出了本申请实施例的一种通信系统的组成结构示意图。本申请实施例提供的通信系统可以包括：车辆到所有(vehicle to everything，V2X)控制网元、用户数据管理网元和策略控制功能(policy control function，PCF)网元。其中，V2X控制网元是指 具有V2X场景下控制功能的网元，例如该V2X控制网元可以包括V2X控制功能(V2X control function，V2XCF)，该V2X控制网元还可以是4G通信系统中具有控制功能的其它网元。用户数据管理网元是指具有V2X场景下的数据管理功能的网元，例如该用户数据管理网元可以是统一数据管理功能实体(unified data management，UDM)和归属用户服务器(home subscriber server，HSS)，或者该用户数据管理网元还可以是统一数据仓库(unified data repository，UDR)，该用户数据管理网元还可以是4G通信系统中具有终端设备数据存储功能的其它网元。PCF网元是指提供策略(Policy)信息的网元，例如PCF网元可以向UE提供UE策略的参数信息，例如该UE策略的参数信息可以包括V2X参数。或者，PCF网元可以向接入和移动管理功能(access and mobility management function，AMF)网元提供接入管理(access management，AM)策略的参数信息，或者PCF网元可以向会话管理功能(session management function，SMF)网元提供会话管理(session management，SM)策略的参数信息。具体的，在V2X的场景中，PCF网元可以向UE和下一代无线接入网(next generation-radio access network，NG-RAN)提供V2X参数，例如该V2X参数可以包括V2X的鉴权和策略参数等信息。
需要说明的是，对于前述的V2X控制网元、用户数据管理网元和PCF网元，网元可以是一个功能实体、软件模块、硬件模块、软硬件结合的模块等等。另外，前述的V2X控制网元、用户数据管理网元和PCF网元的名称只是一种可能的实现方式，本申请实施例不限定具体的网元名称，可以结合具体场景下的网元功能确定相应的网元名称。另外，后续实施例中PCF网元可以简称为PCF，AMF网元可以简称为AMF，以及SMF网元可以简称为SMF。
如图2所示，为本申请实施例提供的一种4G通信系统和5G通信系统相结合的架构示意图。在图2所示的组合系统架构中，V2X控制网元具体可以为V2XCF，用户数据管理网元具体可以包括：HSS+UDM，或者UDR。在4G通信系统中，UE和演进的通用陆地无线接入网络(evolved universal terrestrial radio access network，E-UTRAN)通信，E-UTRAN通过S1-MME接口和MME连接，E-UTRAN通过S1-U接口和服务网关(serving gateway，SGW)连接，MME通过S6a接口和HSS+UDM连接，V2XCF通过V3接口和UE连接，SGW通过S5-U接口和用户平面功能(user plane function，UPF)网元+用户面的分组数据网关(PDN gateway-user，PGW-U)连接，SGW通过S5-C接口和SMF+PGW-C连接，SMF+控制面的分组数据网关(PDN gateway-control，PGW-C)通过N10接口和HSS+UDM连接，UDR通过N35接口和HSS+UDM连接。在5G通信系统中，UE通过N1接口和AMF连接，UE和NG-RAN通信，AMF通过N2接口和NG-RAN连接，UPF+PGW-U通过N3接口和NG-RAN连接，AMF通过N11接口和SMF+PGW-C连接，AMF通过N15接口和PCF连接，AMF通过N8接口和HSS+UDM连接。在组合系统架构中，MME通过N26接口和AMF连接，PCF通过N36接口和UDR连接。基于上述图2可知，V2XCF可以和UE进行通信，PCF可以和UDR进行通信。
如图3所示，为本申请实施例提供的通信系统内网元之间的通信架构示意图。在图3中，网络功能(network function，NF)网元可以通过网络开放功能(network exposure function，NEF)网元和应用功能(application function，AF)网元进行通信。NF网元可以有n个，分别为NF1、NF2、…、NFn，NF可以通过第三代合作伙伴计划(third generation partnership project，3GPP)层和NEF进行通信。NEF是5G通信系统中的核心网与外部网 络交互的接口，NF1-NFn表示核心网内部的网元，例如UDM、AMF、PCF等。NEF网元是用于运营商网络将网络中的数据开放给第三方应用服务器，或接收第三方应用服务器为网络提供的数据的网元，NEF网元上可以配置有n个应用程序编程接口(application programming interface，API)，分别为API1、…、APIn，NEF网元可以通过N33接口和AF进行通信，AF指5G通信系统的核心网外部的网元，例如AF可以是应用服务器，或者是本申请实施例前述的V2XCF。
基于前述的系统架构，接下来介绍本申请实施例提供的通信方法，如图4所示，为本申请实施例提供的V2X控制网元、用户数据管理网元和PCF网元之间的一种交互流程示意图，本申请实施例提供的通信方法，主要包括如下步骤：
401、PCF网元向终端设备发送V2X参数。
在本申请实施例中，PCF网元可以向终端设备发送V2X参数。例如PCF网元可以通过AMF网元向终端设备发送V2X参数。终端设备具体可以是UE等终端，该V2X参数可以是用于PC5通信的UE参数，例如V2X参数可以包括：PC5通信的授权信息。
在本申请的一些实施例中，当终端设备处于第二网络时，PCF网元可以向终端设备发送V2X参数。该第二网络可以是5G通信网络。该V2X参数可以包括：用于第二网络的V2X参数和用于第一网络的V2X参数，例如第一网络可以是4G通信网络。
在本申请的一些实施例中，V2X参数包括如下至少一种：
用于PC5接口通信的运营商网络(public land mobile network，PLMN)列表；
是否进行PC5接口通信的指示信息；
用于PC5接口通信的无线资源配置参数；
用于PC5接口通信的网络选择策略信息；
V2X业务和终端设备的标识信息之间的映射关系。
其中，V2X参数可以是HSS告知V2XCF的签约信息。用于PC5接口通信的运营商网络PLMN列表可以是UE在E-UTRA或NR覆盖下可以进行PC5接口通信的PLMN列表。是否进行PC5接口通信的指示信息是指UE不在E-UTRA并且不在NR覆盖下是否可以进行LTE PC5/NR PC5通信的信息，例如该指示信息可以占用1个比特，通过取值为0或1指示是否进行PC5通信。用于PC5接口通信的无线资源配置参数是指UE可以在“不在E-UTRA并且不在NR覆盖下”的条件下使用LTE PC5，或者NR PC5进行通信，其在通信时采用的具体的无线资源参数，例如该无线资源配置参数可以包含对应的地理位置信息，例如包含地理位置信息的列表。用于PC5接口通信的网络选择策略信息是指用于选择LTE PC5或NR PC5通信的选择策略信息，具体包括“V2X业务”和“对应PC5接口”的映射信息。针对NR PC5接口的通信，V2X参数还可以包括用于建立PC5单播连接以及用于PC5组播和广播通信的“V2X业务”和“对应标识信息”的映射关系。具体可以根据应用场景确定V2X参数所包括的内容，此处仅作说明，不作为对本申请实施例的限定。
402、PCF网元向V2X控制网元发送参数下发通知信息，参数下发通知信息用于通知V2X控制网元PCF网元向终端设备发送V2X参数。
在本申请实施例中，PCF网元向终端设备发送了V2X参数之后，PCF网元可以向V2X控制网元发送参数下发通知信息。其中，PCF网元发送的参数下发通知信息用于通知PCF网 元向终端设备发送V2X参数，即参数下发通知信息用于指示：PCF网元已经向终端设备发送了V2X参数，则接收到该参数下发通知信息的V2X控制网元可以确定出：PCF网元已经向终端设备发送了V2X参数。
在本申请的一些实施例中，步骤402PCF网元向V2X控制网元发送参数下发通知信息，包括：
PCF网元通过网络开放功能NEF网元向V2X控制网元发送参数下发通知信息。
其中，基于前述的图3所示的系统架构可知，PCF网元和V2X控制网元之间可以通过NEF网元来完成，例如PCF网元首先生成参数下发通知信息，然后向NEF网元发送参数下发通知信息，NEF网元接收到参数下发通知信息之后，NEF网元可以向V2X控制网元发送参数下发通知信息，从而使得V2X控制网元可以通过NEF网元从PCF网元获取到参数下发通知信息。
需要说明的是，在本申请的一些实施例中，PCF网元还可以直接与V2X控制网元进行通信，即PCF网元直接向V2X控制网元发送参数下发通知信息，而不需要通过NEF网元。
在本申请的一些实施例中，参数下发通知信息携带PCF网元发送V2X参数的时刻信息；或者，
参数下发通知信息用于指示V2X控制网元记录接收到参数下发通知消息的时刻。
其中，PCF网元发送V2X参数的时刻指的是PCF网元向终端设备发送V2X参数的时刻，V2X参数的时刻可以包含PCF网元向终端设备发送用于4G通信系统的V2X参数的时刻，该V2X参数可以包括：用于4G通信系统的V2X参数。例如PCF网元发送V2X参数的时刻可以是一个时间戳，当V2X控制网元接收到参数下发通知信息时，V2X控制网元可以获取到PCF网元向终端设备发送V2X参数的时刻。不限定的是，本申请实施例中PCF网元发送的参数下发通知信息除了携带PCF网元发送V2X参数的时刻之外，还可以携带V2X控制网元的地址信息和终端设备的标识信息，此处不再详细说明。
在本申请的另一些实施例中，参数下发通知信息还可以指示V2X控制网元获取接收到参数下发通知消息的时刻。即参数下发通知信息还可以用于指示V2X控制网元记录接收到该参数下发通知信息的时刻，当V2X控制网元接收到参数下发通知信息时，V2X控制网元可以记录接收到该参数下发通知信息时的时刻。
411、用户数据管理网元更新终端设备的V2X参数。
在本申请实施例中，用户数据管理网元是指具有V2X场景下的数据管理功能的网元，例如该用户数据管理网元可以是UDM和HSS，或者该用户数据管理网元还可以是UDR。用户数据管理网元首先更新终端设备的V2X参数，在本申请实施例中用户数据管理网元可以存储终端设备的V2X参数，用户数据管理网元在终端设备的V2X参数有更新时，可以更新终端设备的V2X参数。对于需要更新V2X参数的方式有多种，接下来举例说明。
在本申请的一些实施例中，步骤411用户数据管理网元更新终端设备的车辆到所有V2X参数，包括如下情况的至少一种：
所述用户数据管理网元确定所述终端设备为不可达状态时，确定所述V2X参数发生更新；
所述用户数据管理网元确定所述终端设备为去注册状态时，确定所述V2X参数发生更 新；
所述用户数据管理网元确定所述用户数据管理网元存储的V2X参数发生变化时，确定所述V2X参数发生更新。
其中，当终端设备为不可达状态时，确定终端设备的V2X参数需要更新。又如，当终端设备为去注册状态时，确定终端设备的V2X参数需要更新。又如，当用户数据管理网元存储的V2X参数发生变化时，例如用户的签约数据发生改变，例如，用户之前签约的信息包括了增值业务，包含了多个运营商网络，并且可以支持较高的最大PC5接口传输速率，但用户基于某些原因取消了增值业务，进而最大PC5接口传输速率被降低。又例如，用户之前签约信息支持在多个运营商的网络中进行PC5通信，然而由于签约信息的变化，支持的运营商发生了改变。或者，V2X参数已经过期。用户数据管理网元基于上述举例的情况，可以准确的获知V2X参数发生更新。
412、用户数据管理网元向V2X控制网元发送参数更新通知信息，参数更新通知信息用于通知用户数据管理网元更新V2X参数。
在本申请实施例中，用户数据管理网元更新V2X参数之后，用户数据管理网元可以向V2X控制网元发送参数更新通知信息。其中，用户数据管理网元发送的参数更新通知信息用于通知V2X控制网元用户数据管理网元已经更新了V2X参数，则接收到该参数更新通知信息的V2X控制网元可以确定出：用户数据管理网元已经更新了V2X参数。
在本申请的一些实施例中，步骤412用户数据管理网元向V2X控制网元发送参数更新通知信息，包括：
用户数据管理网元通过NEF网元向V2X控制网元发送参数更新通知信息。
其中，基于前述的图3所示的系统架构可知，用户数据管理网元和V2X控制网元之间可以通过NEF网元来完成，例如用户数据管理网元首先生成参数更新通知信息，然后向NEF网元发送参数更新通知信息，NEF网元接收到参数更新通知信息之后，NEF网元可以向V2X控制网元发送参数更新通知信息，从而使得V2X控制网元可以通过NEF网元从用户数据管理网元获取到参数更新通知信息。
需要说明的是，在本申请的一些实施例中，用户数据管理网元还可以直接与V2X控制网元进行通信，即用户数据管理网元直接向V2X控制网元发送参数更新通知信息，而不需要通过NEF网元。
在本申请的一些实施例中，参数更新通知信息携带用户数据管理网元对V2X参数进行更新的时刻；或者，
参数更新通知信息指示V2X控制网元获取接收到参数更新通知消息的时刻。
其中，用户数据管理网元对V2X参数进行更新的时刻指的是用户数据管理网元在更新V2X参数时记录下的时刻，例如用户数据管理网元更新V2X参数的时刻可以是一个时间戳，当V2X控制网元接收到参数更新通知信息时，V2X控制网元可以获取到用户数据管理网元更新V2X参数的时刻。不限定的是，本申请实施例中用户数据管理网元发送的参数更新通知信息除了携带用户数据管理网元发送V2X参数的时刻之外，还可以携带V2X控制网元的地址信息和终端设备的标识信息，此处不再详细说明。
在本申请的另一些实施例中，参数更新通知信息还可以指示V2X控制网元获取接收到 参数更新通知消息的时刻。即参数更新通知信息还可以用于指示V2X控制网元存储接收到该参数更新通知信息的时刻，当V2X控制网元接收到参数更新通知信息时，V2X控制网元可以存储接收到该参数更新通知信息时的时刻。
在本申请的一些实施例中，本申请实施例提供的通信方法中，参数更新通知信息还用于指示所述终端设备在第一网络可达。
具体的，所述用户数据管理网元向所述V2X控制网元发送参数更新通知信息，所述参数更新通知信息用于通知所述V2X控制网元所述终端设备在第一网络可达，V2X控制网元可以确定终端设备在第一网络可达。
在一种可能的实现方式中，所述终端设备在第一网络可达包括：所述终端设备成功注册到所述第一网络中。
例如，当终端设备从第二网络切换至第一网络时，用户数据管理网元可以从移动管理实体确定出该终端设备切换至第二网络，此时用户数据管理网元在参数更新通知信息中携带“终端设备在第一网络可达”的信息，并发送给V2X控制网元，从而V2X控制网元可以从用户数据管理网元接收到参数更新通知信息，V2X控制网元可以根据该参数更新通知信息确定出终端设备在第一网络是可达的，实现了V2X控制网元对终端设备的可达状态的实时感知。其中，第一网络可以是4G网络，第二网络可以是5G网络。
例如，终端设备在第一网络可达，具体地，可以包括终端设备注册至第一网络，用户数据管理网元在所述终端设备在第一网络可达时，向所述V2X控制网元发送参数更新通知信息。所述终端设备在第一网络可达包括所述终端设备在第一网络中注册。
不限定的是，参数更新通知信息可以显式的指示终端设备从第二网络切换至第一网络，也可以仅指示终端设备接入到第一网络，由V2X控制网元根据接收到的参数更新通知信息确定终端设备的切换操作。
421、V2X控制网元接收PCF网元发送的参数下发通知信息，参数下发通知信息用于通知V2X控制网元PCF网元向终端设备发送V2X参数。
在本申请实施例中，在PCF网元执行前述步骤402的情况下，V2X控制网元接收PCF网元发送的参数下发通知信息，接收到该参数下发通知信息的V2X控制网元可以确定出：PCF网元已经向终端设备发送了V2X参数。
在本申请的一些实施例中，步骤421V2X控制网元接收PCF网元发送的参数下发通知信息，包括：
V2X控制网元通过网络开放功能NEF网元接收PCF网元发送的参数下发通知信息。
其中，基于前述的图3所示的系统架构可知，用户数据管理网元和V2X控制网元之间可以通过NEF网元来完成，例如用户数据管理网元首先生成参数更新通知信息，然后向NEF网元发送参数更新通知信息，NEF网元接收到参数更新通知信息之后，NEF网元可以向V2X控制网元发送参数更新通知信息，从而使得V2X控制网元可以通过NEF网元从用户数据管理网元获取到参数更新通知信息。
需要说明的是，在本申请的一些实施例中，用户数据管理网元还可以直接与V2X控制网元进行通信，即用户数据管理网元直接向V2X控制网元发送参数更新通知信息，而不需要通过NEF网元。
422、V2X控制网元接收用户数据管理网元发送的参数更新通知信息，参数更新通知信息用于通知V2X控制网元V2X参数的更新。
在本申请实施例中，在用户数据管理网元执行前述步骤412的情况下，V2X控制网元接收用户数据管理网元发送的参数更新通知信息，接收到该参数更新通知信息的V2X控制网元可以确定出：用户数据管理网元已经更新了V2X参数。
423、V2X控制网元根据参数下发通知信息和参数更新通知信息，向终端设备发送更新后的V2X参数。
在本申请实施例中，V2X控制网元接收到参数下发通知信息和参数更新通知信息之后，V2X控制网元通过对参数下发通知信息和参数更新通知信息的对比分析，V2X控制网元可以向终端设备发送更新后的V2X参数，以使得终端设备可以及时获取到更新后的V2X参数，终端设备可以使用更新后的V2X参数进行通信，从而解决了终端设备使用过期V2X参数导致通信失败的问题。
举例说明如下，V2X控制网元可以通过设备触发(device trigger)过程，向终端设备发送最新的V2X参数。或者V2X控制网元可以通过Device trigger的过程，触发终端设备建立分组数据网络(packet data network，PDN)连接，进而终端设备可以向V2X控制网元请求最新的V2X参数，V2X控制网元可以根据终端设备的请求发送最新的V2X参数。
在本申请的一些实施例中，前述步骤423V2X控制网元根据参数下发通知信息和参数更新通知信息，向终端设备发送更新后的V2X参数，包括：
V2X控制网元根据参数下发通知信息和参数更新通知信息确定V2X参数需要被更新，并向终端设备发送更新后的V2X参数。
其中，V2X控制网元分别接收到参数下发通知信息和参数更新通知信息之后，V2X控制网元可以根据参数下发通知信息所通知的内容以及参数更新通知信息所通知的内容进行对比分析，V2X控制网元可以确定终端设备的V2X参数需要被更新，V2X参数需要被更新指的是终端设备上使用的V2X参数已经发生变化，需要对该V2X参数进行更新。V2X控制网元响应于V2X参数需要被更新，可以向终端设备发送更新后的V2X参数，从而使得终端设备可以及时获取到更新后的V2X参数。
在本申请的一些实施例中，V2X控制网元根据参数下发通知信息和参数更新通知信息确定V2X参数需要被更新，包括：
V2X控制网元根据参数下发通知信息确定出第一时刻，以及根据参数更新通知信息确定出第二时刻；
V2X控制网元根据所述第一时刻和所述第二时刻确定所述V2X参数需要被更新。
其中，V2X控制网元可以根据PCF网元发送的参数下发通知信息确定出第一时刻，该第一时刻可以是参数下发通知信息携带的发送V2X参数的时刻，还可以是按照参数下发通知信息的指示记录下的时刻。V2X控制网元还可以根据用户数据管理网元发送的参数更新通知信息确定出第二时刻，该第二时刻可以是参数更新通知信息携带的更新V2X参数的时刻，还可以是按照参数更新通知信息的指示记录下的时刻。V2X控制网元对比分别获取到的第一时刻和第二时刻，V2X控制网元根据第一时刻和第二时刻确定V2X参数需要被更新，例如第一时刻和第二时刻满足预置的条件时确定V2X参数需要被更新。例如当第一时刻和 第二时刻不相等时，V2X控制网元确定V2X参数需要被更新。
在本申请的一些实施例中，V2X控制网元向终端设备发送更新后的V2X参数之前，本申请实施例提供的通信方法还可以包括如下步骤：
V2X控制网元从用户数据管理网元获取到更新后的V2X参数。
其中，用户数据管理网元可以更新V2X参数，并存储更新后的V2X参数，用户数据管理网元可以和V2X控制网元进行交互，以向V2X控制网元提供更新后的V2X参数。
需要说明的是，用户数据管理网元发送更新后的V2X参数可以和步骤412用户数据管理网元发送参数更新通知信息在一条消息中发送的，也可以是在参数更新通知信息发送之前或者发送之后发送更新后的V2X参数，此处不做限定。
在本申请的一些实施例中，所述参数更新通知信息还用于指示所述终端设备在第一网络可达，其中，所述V2X控制网元为所述第一网络中的网元。
具体的，所述用户数据管理网元向所述V2X控制网元发送参数更新通知信息，所述参数更新通知信息用于通知所述V2X控制网元所述终端设备在第一网络可达，V2X控制网元可以确定终端设备在第一网络可达。
在一种可能的实现方式中，所述终端设备在第一网络可达包括：所述终端设备成功注册到所述第一网络中。
例如，当终端设备从第二网络切换至第一网络时，用户数据管理网元可以从移动管理实体确定出该终端设备切换至第二网络，此时用户数据管理网元在参数更新通知信息中携带“终端设备在第一网络可达”的信息，并发送给V2X控制网元，从而V2X控制网元可以从用户数据管理网元接收到参数更新通知信息，V2X控制网元可以根据该参数更新通知信息确定出终端设备在第一网络是可达的，实现了V2X控制网元对终端设备的可达状态的实时感知。其中，第一网络可以是4G网络，第二网络可以是5G网络。
例如，终端设备在第一网络可达，具体地，可以包括终端设备注册至第一网络，用户数据管理网元在所述终端设备在第一网络可达时，向所述V2X控制网元发送参数更新通知信息。所述终端设备在第一网络可达包括所述终端设备在第一网络中注册。
不限定的是，参数更新通知信息可以显式的指示终端设备从第二网络切换至第一网络，也可以仅指示终端设备接入到第一网络，由V2X控制网元根据接收到的参数更新通知信息确定终端设备的切换操作。
通过前述实施例的举例说明可知，V2X控制网元接收PCF网元发送的参数下发通知信息，参数下发通知信息用于通知PCF网元向终端设备发送V2X参数；V2X控制网元接收用户数据管理网元发送的参数更新通知信息，参数更新通知信息用于通知用户数据管理网元更新V2X参数；V2X控制网元根据参数下发通知信息和参数更新通知信息，向终端设备发送更新后的V2X参数。本申请实施例中V2X控制网元可以从PCF接收到的参数下发通知信息，还可以从用户数据管理网元接收到参数更新通知信息，V2X控制网元根据接收到的两种通知信息就可以向终端设备发送更新后的V2X参数，因此终端设备可以从V2X控制网元获取到更新后的V2X参数，终端设备可以使用更新后的V2X参数进行通信，从而解决了终端设备使用过期V2X参数导致通信失败的问题。
为便于更好的理解和实施本申请实施例的上述方案，下面举例相应的应用场景来进行 具体说明。
请参阅如图5所示，本申请实施例提供的通信方法在一种交互场景下的交互流程示意图。以V2X控制网元具体为V2XCF、终端设备具体为UE、用户数据管理网元具体为UDM+HSS进行示例说明，主要包括如下流程：
S01、V2XCF从HSS订阅控制信息通知。
其中，V2XCF向HSS订阅控制信息通知，从而HSS有更新的控制信息时发送给V2XCF。
S02、V2XCF从PCF订阅控制信息通知。
其中，V2XCF向PCF订阅控制信息通知，从而PCF有更新的控制信息时发送给V2XCF。
S03、UE注册到5G通信系统中的核心网。
其中，UE可以注册至5G系统中的核心网，具体的注册流程不再赘述。
S04、PCF向UE发送V2X参数。
其中，供UE使用的用于PC5的V2X通信参数可以在PCF发起的UE配置更新(Configuration Update)过程中，由PCF经AMF发送至UE处。PCF可以使用的消息是UE Configuration Update(简称UCU)Command消息，其包含的策略信息为用于V2X通信的V2X参数。
S05、PCF发送V2X参数提供通知(提供时间戳)。
其中，PCF在提供V2X参数至UE后，同时会向V2XCF发送消息，该消息用于告知V2XCF PCF已经向UE提供了参数。可选地，消息中可以包含PCF向UE发送UE Configuration Update Command时的时刻信息。举例说明如下：
PCF可以通过NEF向V2XCF发送此消息，具体过程可以是：
PCF向NEF发送消息，消息用于指示NEF进而向V2XCF发送“用于告知V2XCF PCF已经向UE提供了参数”这一消息。可选地，PCF向NEF发送的消息中可以包括：PCF向UE发送UE Configuration Update Command时的时刻信息、V2XCF的地址信息、对应UE的标识信息，例如UE的标识可以是用户永久标识符(subscriber permanent identifier,SUPI)。
另外，PCF直接向V2XCF发送此消息，具体过程可以是：PCF向V2XCF发送“用于告知V2XCF PCF已经向UE提供了参数”这一消息。可选地，消息中可以包括：PCF向UE发送UE Configuration Update Command时的时刻信息、对应UE的标识信息(其可以是SUPI标识)。
S06、V2XCFUE的时间戳。
V2XCF收到此消息后，V2XCF可以获取PCF发送消息的对应时刻，这个对应时刻其可以是：直接包含在PCF发送给的消息内，或者是V2XCF接收到消息时的时刻。V2XCF存储这个对应时刻。
S07、V2X参数发生更新，且无法发送至UE。
S08、UDM+HSS发送V2X参数的更新通知(携带更新的时间戳)。
当UE的参数需要更新时，UDM+HSS会告知V2XCF关于UE参数的更新。可选地，消息中可以包含UDM+HSS更新UE参数的时刻信息。例如UDM+HSS可以通过NEF向V2XCF发送此消息，具体过程可以是：UDM+HSS向NEF发送消息，消息用于指示NEF进而向V2XCF发送“用于告知V2XCF UE的参数已被更新”这一消息。可选地，UDM+HSS向NEF发送的消息中 可以包括：UDM+HSS更新UE参数的时刻信息、V2XCF的地址信息、对应UE的标识信息(其可以是SUPI标识)。
另外，UDM+HSS直接向V2XCF发送此消息，具体过程可以是：UDM+HSS向V2XCF发送“用于告知V2XCF UE的参数已被更新”这一消息。可选地，消息中可以包括：UDM+HSS更新UE参数的时刻信息、对应UE的标识信息(其可以是SUPI标识)。
S09、UE附着到演进的分组核心网(evolved packet core，EPC)。
S10、发送EPC附着通知。
当UE附着(Attach)到EPC时。可选地，UDM+HSS向V2XCF发送指示信息，具体可以包括：UDM+HSS告知V2XCF，UE已经接入了网络。
S11、比较时间戳，确定是否向UE发送最新的V2X参数。
其中，V2XCF发现对于此UE的参数需要更新，那么V2XCF触发参数的更新流程。具体可以依赖如下流程：V2XCF通过对比从PCF和UDM+HSS接收的消息的对应时刻，发现需要更新UE存储的V2X参数。
S12、向UE提供V2X参数。
V2XCF通过Device trigger过程，向UE发送最新的参数；或者通过Device trigger的过程，触发UE建立PDN连接，进而可以与V2XCF进行通信。
通过前述的举例说明可知，本申请实施例中当PCF提供UE参数时，将提供的时间戳告知相关V2XCF，这种方法不涉及对于MME等EPC网元的修改，对目前的4G标准影响较小。V2XCF通过比对存储的两个时刻，判断出需要对UE存储的V2X参数进行更新，进而通过已有的Device trigger过程触发UE发起V2X参数的获取流程。通过上述实施例，解决了UE与核心网关于V2X参数不一致的问题。
基于前述的系统架构，接下来介绍本申请实施例提供的通信方法，如图6所示，为本申请实施例提供的V2X控制网元和用户数据管理网元之间的一种交互流程示意图，本申请实施例提供的通信方法，主要包括如下步骤：
601、用户数据管理网元确定终端设备的V2X参数发生更新。
在本申请实施例中，用户数据管理网元是指具有V2X场景下的数据管理功能的网元，例如该用户数据管理网元可以是UDM和HSS，或者该用户数据管理网元还可以是UDR。用户数据管理网元首先更新终端设备的V2X参数，在本申请实施例中用户数据管理网元可以存储终端设备的V2X参数，用户数据管理网元在终端设备的V2X参数有更新时，可以更新终端设备的V2X参数。对于需要更新V2X参数的方式有多种，接下来举例说明。
在本申请的一些实施例中，步骤601用户数据管理网元确定终端设备的V2X参数发生更新，包括如下情况的至少一种：
所述用户数据管理网元确定所述终端设备为不可达状态时，确定所述V2X参数发生更新；
所述用户数据管理网元确定所述终端设备为去注册状态时，确定所述V2X参数发生更新；
所述用户数据管理网元确定所述用户数据管理网元存储的V2X参数发生变化时，确定所述V2X参数发生更新。
其中，当终端设备为不可达状态时，确定终端设备的V2X参数需要更新。又如，当终端设备为去注册状态时，确定终端设备的V2X参数需要更新。又如，当用户数据管理网元存储的V2X参数发生变化时，例如，用户的签约数据发生改变，例如，用户之前签约的信息包括了增值业务，包含了多个运营商网络，并且可以支持较高的最大PC5接口传输速率，但用户基于某些原因取消了增值业务，进而最大PC5接口传输速率被降低。又例如，用户之前签约信息支持在多个运营商的网络中进行PC5通信，然而由于签约信息的变化，支持的运营商发生了改变。或者，V2X参数已经过期。用户数据管理网元基于上述举例的情况，可以准确的获知V2X参数发生更新。
在本申请的另一些实施例中，步骤601用户数据管理网元确定终端设备的车辆到所有V2X参数发生更新，包括：
用户数据管理网元接收策略控制功能PCF网元发送的参数下发请求信息，参数下发请求信息用于向用户数据管理网元请求V2X参数；
用户数据管理网元根据参数下发请求信息确定出第一时刻；
用户数据管理网元更新V2X参数，并获取更新V2X参数的第二时刻；
用户数据管理网元根据所述第一时刻和所述第二时刻确定所述终端设备的V2X参数发生更新。
其中，用户数据管理网元可以根据PCF网元发送的参数下发请求信息确定出第一时刻，该第一时刻可以根据参数下发请求信息确定出的时刻。用户数据管理网元还可以将更新V2X参数信息的时刻作为第二时刻。用户数据管理网元对比分别获取到的第一时刻和第二时刻，根据第一时刻和第二时刻确定V2X参数需要被更新，例如第一时刻和第二时刻满足预置的条件时确定V2X参数需要被更新。例如当第一时刻和第二时刻不相等时，用户数据管理网元确定V2X参数需要被更新。
在本申请的一些实施例中，所述第一时刻为所述参数下发请求信息中承载的请求时刻，或者，所述第一时刻为接收到所述参数下发请求信息的时刻。
例如，该第一时刻可以是参数下发请求信息携带的请求V2X参数的时刻，还可以是按照参数下发请求信息的指示记录下的时刻。
在本申请的一些实施例中，本申请实施例还提供一种PCF网元执行的通信方法，主要包括如下步骤：
PCF网元向用户数据管理网元发送参数下发请求信息，参数下发请求信息用于向用户数据管理网元请求终端设备的V2X参数。
PCF网元接收用户数据管理网元发送的V2X参数。
其中，当PCF网元需要向终端设备提供V2X参数时，PCF网元会触发向用户数据管理网元获取V2X参数的流程，具体的，PCF网元向用户数据管理网元请求V2X参数，用户数据管理网元向PCF网元发送响应消息，该响应消息包含V2X参数。
在本申请的一些实施例中，参数下发请求信息携带PCF网元请求V2X参数的时刻信息；或者，
参数下发请求信息用于指示用户数据管理网元记录接收到参数下发请求消息的时刻。
具体的，用户数据管理网元可以根据PCF网元发送的参数下发请求信息确定出第一时 刻，该第一时刻可以是参数下发请求信息携带的请求V2X参数的时刻，还可以是按照参数下发请求信息的指示记录下的接收参数下发请求消息的时刻。用户数据管理网元可以根据从参数下发请求信息确定出的第一时刻，以及该用户数据管理网元更新V2X参数的第二时刻来确定V2X参数是否发生更新。
602、用户数据管理网元向V2X控制网元发送参数更新指示信息，参数更新指示信息用于指示终端设备的V2X参数发生更新。
在本申请实施例中，用户数据管理网元更新V2X参数之后，用户数据管理网元可以向V2X控制网元发送参数更新指示信息。其中，用户数据管理网元发送的参数更新指示信息用于指示终端设备的V2X参数发生更新，则接收到该参数更新指示信息的V2X控制网元可以确定出：V2X参数发生更新。
611、V2X控制网元接收用户数据管理网元发送的参数更新指示信息，参数更新指示信息用于指示终端设备的V2X参数发生更新。
在本申请实施例中，在用户数据管理网元执行前述步骤602的情况下，V2X控制网元接收用户数据管理网元发送的参数更新指示信息，接收到该参数更新指示信息的V2X控制网元可以确定出：终端设备的V2X参数发生更新。
612、V2X控制网元根据参数更新指示信息，向终端设备发送更新后的V2X参数。
在本申请实施例中，V2X控制网元接收到参数更新指示信息之后，V2X控制网元从参数更新指示信息携带的指示确定V2X参数发生更新，V2X控制网元可以向终端设备发送更新后的V2X参数，以使得终端设备可以及时获取到更新后的V2X参数，终端设备可以使用更新后的V2X参数进行通信，从而解决了终端设备使用过期V2X参数导致通信失败的问题。
在本申请的一些实施例中，参数更新指示信息还用于指示所述终端设备在第一网络可达。
具体的，所述用户数据管理网元向所述V2X控制网元发送参数更新指示信息，所述参数更新指示信息用于通知所述V2X控制网元所述终端设备在第一网络可达，V2X控制网元可以确定终端设备在第一网络可达。
在一种可能的实现方式中，所述终端设备在第一网络可达包括：所述终端设备成功注册到所述第一网络中。
例如，当终端设备从第二网络切换至第一网络时，用户数据管理网元可以从移动管理实体确定出该终端设备切换至第二网络，此时用户数据管理网元在参数更新指示信息中携带“终端设备在第一网络可达”的信息，并发送给V2X控制网元，从而V2X控制网元可以从用户数据管理网元接收到参数更新指示信息，V2X控制网元可以根据该参数更新指示信息确定出终端设备在第一网络是可达的，实现了V2X控制网元对终端设备的可达状态的实时感知。其中，第一网络可以是4G网络，第二网络可以是5G网络。
例如，终端设备在第一网络可达，具体地，可以包括终端设备注册至第一网络，用户数据管理网元在所述终端设备在第一网络可达时，向所述V2X控制网元发送参数更新指示信息。所述终端设备在第一网络可达包括所述终端设备在第一网络中注册。
不限定的是，参数更新指示信息可以显式的指示终端设备从第二网络切换至第一网络，也可以仅指示终端设备接入到第一网络，由V2X控制网元根据接收到的参数更新指示信息 确定终端设备的切换操作。
在本申请的一些实施例中，所述V2X参数包括如下至少一种：
用于PC5接口通信的运营商网络PLMN列表；
是否进行PC5接口通信的指示信息；
用于PC5接口通信的无线资源配置参数；
用于PC5接口通信的网络选择策略信息；
V2X业务和终端设备的标识信息之间的映射关系。
其中，V2X参数可以是HSS告知V2XCF的签约信息。用于PC5接口通信的运营商网络PLMN列表可以是UE在E-UTRA或NR覆盖下可以进行PC5接口通信的PLMN列表。是否进行PC5接口通信的指示信息是指UE不在E-UTRA并且不在NR覆盖下是否可以进行LTE PC5/NR PC5通信的信息，例如该指示信息可以占用1个比特，通过取值为0或1指示是否进行PC5通信。用于PC5接口通信的无线资源配置参数是指UE可以在“不在E-UTRA并且不在NR覆盖下”的条件下使用LTE PC5，或者NR PC5进行通信，其在通信时采用的具体的无线资源参数，例如该无线资源配置参数可以包含对应的地理位置信息，例如包含地理位置信息的列表。用于PC5接口通信的网络选择策略信息是指用于选择LTE PC5或NR PC5通信的选择策略信息，具体包括“V2X业务”和“对应PC5接口”的映射信息。针对NR PC5接口的通信，V2X参数还可以包括用于建立PC5单播连接以及用于PC5组播和广播通信的“V2X业务”和“对应标识信息”的映射关系。具体可以根据应用场景确定V2X参数所包括的内容，此处仅作说明，不作为对本申请实施例的限定。
在本申请的一些实施例中，V2X控制网元向终端设备发送更新后的V2X参数之前，本申请实施例提供的通信方法还可以包括如下步骤：
V2X控制网元从用户数据管理网元获取到更新后的V2X参数。
其中，用户数据管理网元可以更新V2X参数，并存储更新后的V2X参数，用户数据管理网元可以和V2X控制网元进行交互，以向V2X控制网元提供更新后的V2X参数。
需要说明的是，用户数据管理网元发送更新后的V2X参数可以和步骤412用户数据管理网元发送参数更新通知信息在一条消息中发送的，也可以是在参数更新通知信息发送之前或者发送之后发送更新后的V2X参数，此处不做限定。
通过前述实施例的举例说明可知，V2X控制网元接收用户数据管理网元发送的参数更新指示信息，参数更新指示信息用于指示终端设备的V2X参数发生更新。V2X控制网元根据参数更新指示信息，向终端设备发送更新后的V2X参数。本申请实施例中V2X控制网元可以从用户数据管理网元接收到参数更新指示信息，V2X控制网元根据接收到的指示信息就可以向终端设备发送更新后的V2X参数，因此终端设备可以从V2X控制网元获取到更新后的V2X参数，终端设备可以使用更新后的V2X参数进行通信，从而解决了终端设备使用过期V2X参数导致通信失败的问题。
为便于更好的理解和实施本申请实施例的上述方案，下面举例相应的应用场景来进行具体说明。
请参阅如图7a所示，本申请实施例提供的通信方法在一种交互场景下的交互流程示意图。以V2X控制网元具体为V2XCF、终端设备具体为UE、用户数据管理网元具体为UDM+HSS， 或者UDR进行示例说明，主要包括如下流程：
S11、V2XCF从HSS订阅控制信息通知。
其中，V2XCF向HSS订阅控制信息通知，从而HSS有更新的控制信息时发送给V2XCF。
S12、UE注册到5G通信系统中的核心网。
其中，UE可以注册至5G系统中的核心网，具体的注册流程不再赘述。
S13、PCF获取V2X参数。
当PCF需要向UE提供V2X参数时，PCF会触发向UDM+HSS/UDR获取V2X参数的流程，具体的，PCF向UDM+HSS以及UDR请求V2X参数，UDM+HSS/UDR向PCF发送响应消息，消息包含V2X参数。
S14、UDM+HSS/UDR存储时刻信息。
UDM+HSS/UDR网元存储时刻信息，时刻信息可以是：PCF发送请求携带的对应时刻，或者接收PCF请求的对应时刻。
S15、PCF向UE发送V2X参数。
其中，供UE使用的用于PC5的V2X通信参数会在PCF发起的UE Configuration Update过程中，由PCF经AMF发送至UE处。使用的消息可以是UE Configuration Update Command消息，其包含的策略信息为用于V2X通信的V2X参数。
S16、V2X参数发生更新。
UE的V2X参数发生改变，例如UE的签约信息发生改变，此信息可以是UDM+HSS/UDR存储的签约信息。
S17、UDM+HSS/UDR设置需要更新V2X参数的指示。
其中，UDM+HSS/UDR记录“需要在UE侧更新参数”这一信息，具体可以是：UDM+HSS/UDR会记录其更新UE参数的时刻信息，通过对比向UE发送参数的时刻，以及更新UE参数的时刻，确定UE侧的参数需要被更新。或者，当UE的参数需要更新时，UDM+HSS/UDR发现UE此时不可达，此时UDM+HSS/UDR确定UE侧的参数需要被更新。
S18、UE注册到EPC。
S19、UDM+HSS提供最新的V2X参数。
UE此后Attach到EPC，根据V2X的流程，MME需要自HSS处获取UE参数，因此UDM+HSS/UDR获知注册到4G通信网络中。UDM+HSS/UDR此时向V2XCF发送消息，告知V2XCF此UE的参数需要更新，此后V2XCF触发参数的更新流程。具体可以通过流程：V2XCF通过对比从PCF和UDM+HSS接收的消息的对应时刻，发现需要更新UE存储的V2X参数。
S20、V2XCF向UE提供V2X参数。
V2XCF通过Device trigger过程，向UE发送最新的参数；或者通过Device trigger的过程，触发UE建立PDN连接，进而可以与V2XCF进行通信。
通过前述的举例说明可知，本申请实施例提供了一种通过5G通信系统中的核心网提供V2X参数至UE处的方法。由UDM+HSS判断是否需要更新UE参数，并且在UE接入到EPC时，UDM+HSS/UDR告知V2XCF需要更新UE的参数。通过前述的实施例，解决了UE与核心网关于V2X参数不一致的问题。
接下来针对HSS+UDM/UDR根据签约信息的更新以及UE不可达的条件触发在UE侧更新 参数进行详细说明，请参阅如图7b所示，本申请实施例提供的通信方法在一种交互场景下的交互流程示意图。以V2X控制网元具体为V2XCF、终端设备具体为UE、用户数据管理网元具体为UDM+HSS，或者UDR进行示例说明，主要包括如下流程：
S11a、UE注册到5G通信系统中的核心网。
S12a、PCF向UE发送V2X参数。
其中，供UE使用的用于PC5的V2X通信参数会在PCF发起的UE Configuration Update过程中，由PCF经AMF发送至UE处。使用的消息可以是UE Configuration Update Command消息，其包含的策略信息为用于V2X通信的V2X参数。
S13a、V2X参数发生更新。
UE的V2X参数发生改变，例如UE的签约信息发生改变，此信息可以是UDM+HSS/UDR存储的签约信息。
S14a、UDM+HSS/UDR设置需要更新V2X参数的指示。
其中，UDM+HSS/UDR记录“需要在UE侧更新参数”这一信息，具体可以是：当UE的参数需要更新时，UDM+HSS/UDR发现UE此时不可达，此时UDM+HSS/UDR确定UE侧的参数需要被更新。此处的不可达指UE在5G通信系统中不可达。
S15a、UE注册到EPC。
UE此后Attach到EPC，根据V2X的流程，MME需要自HSS处获取UE参数，因此UDM+HSS/UDR获知注册到4G通信网络中。MME自HSS处获取参数的消息可以是Update Location Request消息。
S16a、UDM+HSS提供最新的V2X参数。
UDM+HSS/UDR此时向V2XCF发送消息，告知V2XCF此UE的参数需要更新，此后V2XCF触发参数的更新流程。具体可以是，V2XCF在接收到消息后，通过消息本身或消息包含的参数需要更新的指示信息，发现需要更新UE存储的V2X参数。
S17a、V2XCF向UE提供V2X参数。
V2XCF向UE提供参数的步骤可以是：V2XCF通过Device trigger过程，向UE发送最新的参数；或者通过Device trigger的过程，触发UE建立PDN连接，进而可以与V2XCF进行通信。
通过前述的举例说明可知，本申请实施例提供了一种通过5G通信系统中的核心网提供V2X参数至UE处的方法。由UDM+HSS判断是否需要更新UE参数，并且在UE接入到EPC时，UDM+HSS/UDR告知V2XCF需要更新UE的参数。通过前述的实施例，解决了UE与核心网关于V2X参数不一致的问题。
基于前述的系统架构，接下来介绍本申请实施例提供的通信方法，如图8所示，为本申请实施例提供的用户数据管理网元和移动管理实体(mobility management entity，MME)之间的一种交互流程示意图，本申请实施例提供的通信方法，主要包括如下步骤：
801、用户数据管理网元确定终端设备的V2X参数发生更新。
在本申请实施例中，用户数据管理网元是指具有V2X场景下的数据管理功能的网元，例如该用户数据管理网元可以是UDM和HSS，或者该用户数据管理网元还可以是UDR。用户数据管理网元首先更新终端设备的V2X参数，在本申请实施例中用户数据管理网元可以存 储终端设备的V2X参数，用户数据管理网元在终端设备的V2X参数有更新时，可以更新终端设备的V2X参数。对于需要更新V2X参数的方式有多种，接下来举例说明。
在本申请的一些实施例中，步骤801用户数据管理网元确定终端设备的V2X参数发生更新，包括如下情况中的至少一种：
所述用户数据管理网元确定所述终端设备为不可达状态时，确定所述V2X参数发生更新；
所述用户数据管理网元确定所述终端设备为去注册状态时，确定所述V2X参数发生更新；
所述用户数据管理网元确定所述用户数据管理网元存储的V2X参数发生变化时，确定所述V2X参数发生更新。
其中，当终端设备为不可达状态时，确定终端设备的V2X参数需要更新。又如，当终端设备为去注册状态时，确定终端设备的V2X参数需要更新。又如，当用户数据管理网元存储的V2X参数发生变化时，例如，用户的签约数据发生改变，例如，用户之前签约的信息包括了增值业务，包含了多个运营商网络，并且可以支持较高的最大PC5接口传输速率，但用户基于某些原因取消了增值业务，进而最大PC5接口传输速率被降低。又例如，用户之前签约信息支持在多个运营商的网络中进行PC5通信，然而由于签约信息的变化，支持的运营商发生了改变。或者，V2X参数已经过期。用户数据管理网元基于上述举例的情况，可以准确的获知V2X参数发生更新。
在本申请的另一些实施例中，步骤801用户数据管理网元确定终端设备的车辆到所有V2X参数发生更新，包括：
用户数据管理网元接收策略控制功能PCF网元发送的参数下发请求信息，参数下发请求信息用于向用户数据管理网元请求V2X参数；
用户数据管理网元根据参数下发请求信息确定出第一时刻；
用户数据管理网元更新V2X参数，并获取更新V2X参数的第二时刻；
用户数据管理网元根据第一时刻和第二时刻确定V2X参数发生更新。
其中，用户数据管理网元可以根据PCF网元发送的参数下发请求信息确定出第一时刻，该第一时刻可以是参数下发请求信息携带的请求V2X参数的时刻，还可以是按照参数下发请求信息的指示记录下的时刻。用户数据管理网元还可以将更新V2X参数信息的时刻作为第二时刻。用户数据管理网元对比分别获取到的第一时刻和第二时刻，根据第一时刻和第二时刻确定V2X参数需要被更新，例如第一时刻和第二时刻满足预置的条件时确定V2X参数需要被更新。例如当第一时刻和第二时刻不相等时，用户数据管理网元确定V2X参数需要被更新。
在本申请的一些实施例中，本申请实施例还提供一种PCF网元执行的通信方法，主要包括如下步骤：
PCF网元向用户数据管理网元发送参数下发请求信息，参数下发请求信息用于向用户数据管理网元请求终端设备的V2X参数。
PCF网元接收用户数据管理网元发送的V2X参数。
其中，当PCF网元需要向终端设备提供V2X参数时，PCF网元会触发向用户数据管理 网元获取V2X参数的流程，具体的，PCF网元向用户数据管理网元请求V2X参数，用户数据管理网元向PCF网元发送响应消息，消息包含V2X参数。
在本申请的一些实施例中，参数下发请求信息携带PCF网元请求V2X参数的时刻；或者，
参数下发请求信息请求用户数据管理网元获取接收到参数下发请求消息的时刻。
具体的，用户数据管理网元可以根据PCF网元发送的参数下发请求信息确定出第一时刻，该第一时刻可以是参数下发请求信息携带的请求V2X参数的时刻，还可以是按照参数下发请求信息的指示记录下的接收参数下发请求消息的时刻。用户数据管理网元可以根据从参数下发请求信息确定出的第一时刻，以及该用户数据管理网元更新V2X参数的第二时刻来确定V2X参数是否发生更新。
802、用户数据管理网元向MME发送参数更新指示信息，参数更新指示信息用于指示终端设备的V2X参数发生更新。
在本申请实施例中，用户数据管理网元更新V2X参数之后，用户数据管理网元可以向MME发送参数更新指示信息。其中，用户数据管理网元发送的参数更新指示信息用于指示终端设备的V2X参数发生更新。
811、MME接收用户数据管理网元发送的参数更新指示信息，参数更新指示信息用于指示终端设备的V2X参数发生更新。
在本申请实施例中，在用户数据管理网元执行前述步骤802的情况下，MME接收用户数据管理网元发送的参数更新指示信息，接收到该参数更新指示信息的MME可以确定出：终端设备的V2X参数发生更新。例如，用户数据管理网元可以是HHS。
在本申请的一些实施例中，参数更新指示信息为用户数据管理网元响应于终端设备为不可达状态或者去注册状态，或者用户数据管理网元存储的V2X参数发生变化，向MME发送。
其中，当终端设备为不可达状态时，确定终端设备的V2X参数需要更新。又如，当终端设备为去注册状态时，确定终端设备的V2X参数需要更新。又如，当用户数据管理网元存储的V2X参数发生变化时，例如，用户的签约数据发生改变，例如，用户之前签约的信息包括了增值业务，包含了多个运营商网络，并且可以支持较高的最大PC5接口传输速率，但用户基于某些原因取消了增值业务，进而最大PC5接口传输速率被降低。又例如，用户之前签约信息支持在多个运营商的网络中进行PC5通信，然而由于签约信息的变化，支持的运营商发生了改变。或者，V2X参数已经过期。
812、MME根据参数更新指示信息指示终端设备获取更新后的V2X参数。
在本申请实施例中，MME接收到参数更新指示信息之后，MME从参数更新指示信息携带的指示确定V2X参数发生更新，MME可以向终端设备发送更新后的V2X参数，以使得终端设备可以及时获取到更新后的V2X参数，终端设备可以使用更新后的V2X参数进行通信，从而解决了终端设备使用过期V2X参数导致通信失败的问题。
在本申请实施例中，MME指示终端设备获取更新后的V2X参数具有多种实现方式。例如，MME可以获取更新后的V2X参数，然后发送给终端设备，即MME可以直接向终端设备发送更新后的V2X参数。或者，MME可以发送指示信息，指示终端设备和V2X控制网元进 行通信，例如，MME可以向终端设备仅发送指示信息，指示终端设备通过PDN连接，由终端设备从V2XCF处获取更新后的V2X参数。
在本申请的一些实施例中，MME向终端设备发送更新后的V2X参数之前，本申请实施例提供的通信方法还可以包括如下步骤：
MME从用户数据管理网元获取到更新后的V2X参数。
其中，用户数据管理网元可以更新V2X参数，并存储更新后的V2X参数，用户数据管理网元可以和MME进行交互，以向MME提供更新后的V2X参数。
通过前述实施例的举例说明可知，MME接收用户数据管理网元发送的参数更新指示信息，参数更新指示信息用于指示终端设备的V2X参数发生更新。V2X控制网元根据参数更新指示信息，MME向终端设备发送更新后的V2X参数。本申请实施例中MME可以从用户数据管理网元接收到参数更新指示信息，MME根据接收到的指示信息就可以向终端设备发送更新后的V2X参数，因此终端设备可以从MME获取到更新后的V2X参数，终端设备可以使用更新后的V2X参数进行通信，从而解决了终端设备使用过期V2X参数导致通信失败的问题。
为便于更好的理解和实施本申请实施例的上述方案，下面举例相应的应用场景来进行具体说明。
请参阅如图9所示，本申请实施例提供的通信方法在一种交互场景下的交互流程示意图。以V2X控制网元具体为V2XCF、终端设备具体为UE、用户数据管理网元具体为UDM+HSS，或者UDR进行示例说明，主要包括如下流程：
S21、UE注册到5G通信系统中的核心网。
其中，UE可以注册至5G系统中的核心网，具体的注册流程不再赘述。
S22、PCF向UE发送V2X参数。
当PCF需要向UE提供V2X参数时，PCF会触发向UDM+HSS/UDR获取V2X参数的流程，具体的，PCF向UDM+HSS以及UDR请求V2X参数，UDM+HSS/UDR向PCF发送响应消息，消息包含V2X参数。
S23、UDM+HSS/UDR确定V2X参数发生更新。
UE的V2X参数发生改变，例如UE的签约信息发生改变，此信息可以是UDM+HSS/UDR存储的签约信息。
S24、UDM+HSS/UDR设置需要更新V2X参数的指示。
其中，UDM+HSS/UDR记录“需要在UE侧更新参数”这一信息，具体可以是：UDM+HSS/UDR会记录其更新UE参数的时刻信息，通过对比向UE发送参数的时刻，以及更新UE参数的时刻，确定UE侧的参数需要被更新。或者，当UE的参数需要更新时，UDM+HSS/UDR发现UE此时不可达，此时UDM+HSS/UDR确定UE侧的参数需要被更新。
S25、UE注册到EPC。
S26、MME获取V2X参数(包括更新指示)。
UE此后Attach到EPC。根据V2X的流程，MME需要自HSS处获取参数，从而UDM+HSS/UDR获知UE参数需要被更新。MMME获取UE在EPC的签约信息，UDM+HSS/UDR此时向MME发送消息，消息包括指示信息，指示UE其存储的V2X参数需要更新。
S27、UE接收附着接受消息(包括更新指示)。
MME可以在向UE发送的非接入层(non access stratum，NAS)消息中，包含UDM+HSS/UDR发送的指示信息，此指示信息可以包含在UE的签约信息中。
S28、在EPS中，V2XCF与UE进行参数交互。
通过前述的举例说明可知，本申请实施例提供了一种在签约信息中包含UE的更新信息的方法。由MME通过NAS消息向UE发送信息，告知UE需要触发与V2XCF的交互流程。本申请实施例中使用了NAS消息来携带V2X参数，实现起来较为简单，不需要V2XCF触发Device trigger等过程。通过前述实施例，解决了UE与核心网关于V2X参数不一致的问题。
需要说明的是，对于前述的各方法实施例，为了简单描述，故将其都表述为一系列的动作组合，但是本领域技术人员应该知悉，本申请并不受所描述的动作顺序的限制，因为依据本申请，某些步骤可以采用其他顺序或者同时进行。其次，本领域技术人员也应该知悉，说明书中所描述的实施例均属于优选实施例，所涉及的动作和模块并不一定是本申请所必须的。
为便于更好的实施本申请实施例的上述方案，下面还提供用于实施上述方案的相关装置。
本申请实施例提供的一种通信装置，所述通信装置为车辆到所有V2X控制网元，包括至少一个处理器，所述至少一个处理器用于与存储器耦合，读取并执行所述存储器中的指令，以实现如前述V2X控制网元执行的通信方法。
在一种可能的实现方式中，所述通信装置还包括：所述存储器。
本申请实施例提供另一种通信装置，所述通信装置为用户数据管理网元，包括至少一个处理器，所述至少一个处理器用于与存储器耦合，读取并执行所述存储器中的指令，以实现如前述用户数据管理网元执行的通信方法。
在一种可能的实现方式中，所述通信装置还包括：所述存储器。
本申请实施例提供另一种通信装置，所述通信装置为策略控制功能PCF网元，包括至少一个处理器，所述至少一个处理器用于与存储器耦合，读取并执行所述存储器中的指令，以实现如前述PCF网元执行的通信方法。
在一种可能的实现方式中，所述通信装置还包括：所述存储器。
需要说明的是，上述装置各模块/单元之间的信息交互、执行过程等内容，由于与本申请方法实施例基于同一构思，其带来的技术效果与本申请方法实施例相同，具体内容可参见本申请前述所示的方法实施例中的叙述，此处不再赘述。
本申请实施例还提供一种计算机存储介质，其中，该计算机存储介质存储有程序，该程序执行包括上述方法实施例中记载的部分或全部步骤。
接下来介绍本申请实施例提供的另一种V2X控制网元，请参阅图10所示，V2X控制网元1000包括：处理器1003。可选的，V2X控制网元1000还包括：存储器1004。可选的，存储器1004还包括：接收器1001、发射器1002。其中V2X控制网元1000中的处理器1003的数量可以一个或多个，图10中以一个处理器为例。在本申请的一些实施例中，接收器1001、发射器1002、处理器1003和存储器1004可通过总线或其它方式连接，其中，图10 中以通过总线连接为例。
存储器1004可以包括只读存储器和随机存取存储器，并向处理器1003提供指令和数据。存储器1004的一部分还可以包括非易失性随机存取存储器(non-volatile random access memory，NVRAM)。存储器1004存储有操作系统和操作指令、可执行模块或者数据结构，或者它们的子集，或者它们的扩展集，其中，操作指令可包括各种操作指令，用于实现各种操作。操作系统可包括各种系统程序，用于实现各种基础业务以及处理基于硬件的任务。
处理器1003控制V2X控制网元1000的操作，处理器1003还可以称为中央处理单元(central processing unit，CPU)。具体的应用中，V2X控制网元1000的各个组件通过总线系统耦合在一起，其中总线系统除包括数据总线之外，还可以包括电源总线、控制总线和状态信号总线等。但是为了清楚说明起见，在图中将各种总线都称为总线系统。
上述本申请实施例揭示的方法可以应用于处理器1003中，或者由处理器1003实现。处理器1003可以是一种集成电路芯片，具有信号的处理能力。在实现过程中，上述方法的各步骤可以通过处理器1003中的硬件的集成逻辑电路或者软件形式的指令完成。上述的处理器1003可以是通用处理器、数字信号处理器(digital signal processing，DSP)、专用集成电路(application specific integrated circuit，ASIC)、现场可编程门阵列(field-programmable gate array，FPGA)或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件。可以实现或者执行本申请实施例中的公开的各方法、步骤及逻辑框图。通用处理器可以是微处理器或者该处理器也可以是任何常规的处理器等。结合本申请实施例所公开的方法的步骤可以直接体现为硬件译码处理器执行完成，或者用译码处理器中的硬件及软件模块组合执行完成。软件模块可以位于随机存储器，闪存、只读存储器，可编程只读存储器或者电可擦写可编程存储器、寄存器等本领域成熟的存储介质中。该存储介质位于存储器1004，处理器1003读取存储器1004中的信息，结合其硬件完成上述方法的步骤。
接收器1001可用于接收输入的数字或字符信息，以及产生与V2X控制网元1000的相关设置以及功能控制有关的信号输入，发射器1002可包括显示屏等显示设备，发射器1002可用于通过外接接口输出数字或字符信息。
本申请实施例中，处理器1003，用于执行前述的由V2X控制网元执行的通信方法。
接下来介绍本申请实施例提供的另一种用户数据管理网元，请参阅图11所示，用户数据管理网元1100包括：处理器1103。可选的，用户数据管理网元1100还包括：存储器1104。可选的，用户数据管理网元1100还包括：接收器1101、发射器1102。其中用户数据管理网元1100中的处理器1103的数量可以一个或多个，图11中以一个处理器为例。在本申请的一些实施例中，接收器1101、发射器1102、处理器1103和存储器1104可通过总线或其它方式连接，其中，图11中以通过总线连接为例。
存储器1104可以包括只读存储器和随机存取存储器，并向处理器1103提供指令和数据。存储器1104的一部分还可以包括NVRAM。存储器1104存储有操作系统和操作指令、可执行模块或者数据结构，或者它们的子集，或者它们的扩展集，其中，操作指令可包括各种操作指令，用于实现各种操作。操作系统可包括各种系统程序，用于实现各种基础业 务以及处理基于硬件的任务。
处理器1103控制用户数据管理网元的操作，处理器1103还可以称为CPU。具体的应用中，用户数据管理网元的各个组件通过总线系统耦合在一起，其中总线系统除包括数据总线之外，还可以包括电源总线、控制总线和状态信号总线等。但是为了清楚说明起见，在图中将各种总线都称为总线系统。
上述本申请实施例揭示的方法可以应用于处理器1103中，或者由处理器1103实现。处理器1103可以是一种集成电路芯片，具有信号的处理能力。在实现过程中，上述方法的各步骤可以通过处理器1103中的硬件的集成逻辑电路或者软件形式的指令完成。上述的处理器1103可以是通用处理器、DSP、ASIC、FPGA或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件。可以实现或者执行本申请实施例中的公开的各方法、步骤及逻辑框图。通用处理器可以是微处理器或者该处理器也可以是任何常规的处理器等。结合本申请实施例所公开的方法的步骤可以直接体现为硬件译码处理器执行完成，或者用译码处理器中的硬件及软件模块组合执行完成。软件模块可以位于随机存储器，闪存、只读存储器，可编程只读存储器或者电可擦写可编程存储器、寄存器等本领域成熟的存储介质中。该存储介质位于存储器1104，处理器1103读取存储器1104中的信息，结合其硬件完成上述方法的步骤。
本申请实施例中，处理器1103，用于执行前述的由用户数据管理网元执行的通信方法。
接下来介绍本申请实施例提供的另一种PCF网元，请参阅图12所示，PCF网元1200包括：处理器1203。可选的，PCF网元1200还包括：存储器1204。可选的，PCF网元1200还包括：接收器1201、发射器1202。其中PCF网元1200中的处理器1203的数量可以一个或多个，图12中以一个处理器为例。在本申请的一些实施例中，接收器1201、发射器1202、处理器1203和存储器1204可通过总线或其它方式连接，其中，图12中以通过总线连接为例。
存储器1204可以包括只读存储器和随机存取存储器，并向处理器1203提供指令和数据。存储器1204的一部分还可以包括NVRAM。存储器1204存储有操作系统和操作指令、可执行模块或者数据结构，或者它们的子集，或者它们的扩展集，其中，操作指令可包括各种操作指令，用于实现各种操作。操作系统可包括各种系统程序，用于实现各种基础业务以及处理基于硬件的任务。
处理器1203控制PCF网元的操作，处理器1203还可以称为CPU。具体的应用中，PCF网元的各个组件通过总线系统耦合在一起，其中总线系统除包括数据总线之外，还可以包括电源总线、控制总线和状态信号总线等。但是为了清楚说明起见，在图中将各种总线都称为总线系统。
上述本申请实施例揭示的方法可以应用于处理器1203中，或者由处理器1203实现。处理器1203可以是一种集成电路芯片，具有信号的处理能力。在实现过程中，上述方法的各步骤可以通过处理器1203中的硬件的集成逻辑电路或者软件形式的指令完成。上述的处理器1203可以是通用处理器、DSP、ASIC、FPGA或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件。可以实现或者执行本申请实施例中的公开的各方法、步骤及逻辑框图。通用处理器可以是微处理器或者该处理器也可以是任何常规的处理器等。结 合本申请实施例所公开的方法的步骤可以直接体现为硬件译码处理器执行完成，或者用译码处理器中的硬件及软件模块组合执行完成。软件模块可以位于随机存储器，闪存、只读存储器，可编程只读存储器或者电可擦写可编程存储器、寄存器等本领域成熟的存储介质中。该存储介质位于存储器1204，处理器1203读取存储器1204中的信息，结合其硬件完成上述方法的步骤。
本申请实施例中，处理器1203，用于执行前述的由PCF网元执行的通信方法。
在另一种可能的设计中，当V2X控制网元、用户数据管理网元、PCF网元为服务器内的芯片时，芯片包括：处理单元和通信单元，所述处理单元例如可以是处理器，所述通信单元例如可以是输入/输出接口、管脚或电路等。该处理单元可执行存储单元存储的计算机执行指令，以使该终端内的芯片执行上述第一方面任意一项的无线通信方法。可选地，所述存储单元为所述芯片内的存储单元，如寄存器、缓存等，所述存储单元还可以是所述终端内的位于所述芯片外部的存储单元，如只读存储器(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)等。
其中，上述任一处提到的处理器，可以是一个通用中央处理器，微处理器，ASIC，或一个或多个用于控制上述第一方面方法的程序执行的集成电路。
另外需说明的是，以上所描述的装置实施例仅仅是示意性的，其中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或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部模块来实现本实施例方案的目的。另外，本申请提供的装置实施例附图中，模块之间的连接关系表示它们之间具有通信连接，具体可以实现为一条或多条通信总线或信号线。
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本申请可借助软件加必需的通用硬件的方式来实现，当然也可以通过专用硬件包括专用集成电路、专用CPU、专用存储器、专用元器件等来实现。一般情况下，凡由计算机程序完成的功能都可以很容易地用相应的硬件来实现，而且，用来实现同一功能的具体硬件结构也可以是多种多样的，例如模拟电路、数字电路或专用电路等。但是，对本申请而言更多情况下软件程序实现是更佳的实施方式。基于这样的理解，本申请的技术方案本质上或者说对现有技术做出贡献的部分可以以软件产品的形式体现出来，该计算机软件产品存储在可读取的存储介质中，如计算机的软盘、U盘、移动硬盘、ROM、RAM、磁碟或者光盘等，包括若干指令用以使得一台计算机设备(可以是个人计算机，服务器，或者网络设备等)执行本申请各个实施例所述的方法。
在上述实施例中，可以全部或部分地通过软件、硬件、固件或者其任意组合来实现。当使用软件实现时，可以全部或部分地以计算机程序产品的形式实现。
所述计算机程序产品包括一个或多个计算机指令。在计算机上加载和执行所述计算机程序指令时，全部或部分地产生按照本申请实施例所述的流程或功能。所述计算机可以是通用计算机、专用计算机、计算机网络、或者其他可编程装置。所述计算机指令可以存储在计算机可读存储介质中，或者从一个计算机可读存储介质向另一计算机可读存储介质传 输，例如，所述计算机指令可以从一个网站站点、计算机、服务器或数据中心通过有线(例如同轴电缆、光纤、数字用户线(DSL))或无线(例如红外、无线、微波等)方式向另一个网站站点、计算机、服务器或数据中心进行传输。所述计算机可读存储介质可以是计算机能够存储的任何可用介质或者是包含一个或多个可用介质集成的服务器、数据中心等数据存储设备。所述可用介质可以是磁性介质，(例如，软盘、硬盘、磁带)、光介质(例如，DVD)、或者半导体介质(例如固态硬盘(Solid State Disk，SSD))等。

Claims (25)

  1. 一种通信方法，其特征在于，包括：
    车辆到所有V2X控制网元接收用户数据管理网元发送的参数更新指示信息，所述参数更新指示信息用于指示终端设备的V2X参数发生更新；
    所述V2X控制网元根据所述参数更新指示信息，向所述终端设备发送更新后的V2X参数。
  2. 根据权利要求1所述的方法，其特征在于，所述方法还包括：
    所述V2X控制网元从所述用户数据管理网元获取更新后的V2X参数。
  3. 根据权利要求1至2中任一项所述的方法，其特征在于，
    所述参数更新指示信息还用于指示所述终端设备在第一网络可达，其中，所述V2X控制网元为所述第一网络中的网元。
  4. 根据权利要求3所述的方法，其特征在于，所述终端设备在第一网络可达包括：所述终端设备在所述第一网络中注册。
  5. 根据权利要求1至4中任一项所述的方法，其特征在于，所述V2X参数包括如下至少一种：
    用于PC5接口通信的运营商网络PLMN列表；
    是否进行PC5接口通信的指示信息；
    用于PC5接口通信的无线资源配置参数；
    用于PC5接口通信的网络选择策略信息；
    V2X业务和终端设备的标识信息之间的映射关系。
  6. 一种通信方法，其特征在于，包括：
    用户数据管理网元确定终端设备的车辆到所有V2X参数发生更新；
    所述用户数据管理网元向V2X控制网元发送参数更新指示信息，所述参数更新指示信息用于指示所述终端设备的V2X参数发生更新。
  7. 根据权利要求6所述的方法，其特征在于，所述用户数据管理网元确定终端设备的车辆到所有V2X参数发生更新，包括：
    所述用户数据管理网元接收策略控制功能PCF网元发送的参数下发请求信息，所述参数下发请求信息用于向所述用户数据管理网元请求所述终端设备的V2X参数；
    所述用户数据管理网元根据所述参数下发请求信息确定第一时刻；
    所述用户数据管理网元更新所述终端设备的V2X参数，并获取更新V2X参数的第二时刻；
    所述用户数据管理网元根据所述第一时刻和所述第二时刻确定所述终端设备的V2X参数发生更新。
  8. 根据权利要求7所述的方法，其特征在于，所述第一时刻为所述参数下发请求信息中承载的请求时刻，或者，所述第一时刻为接收到所述参数下发请求信息的时刻。
  9. 根据权利要求6所述的方法，其特征在于，所述用户数据管理网元确定终端设备的车辆到所有V2X参数发生更新，包括如下情况中的至少一种：
    所述用户数据管理网元确定所述终端设备为不可达状态时，确定所述V2X参数发生更 新；
    所述用户数据管理网元确定所述终端设备为去注册状态时，确定所述V2X参数发生更新；
    所述用户数据管理网元确定所述用户数据管理网元存储的V2X参数发生变化时，确定所述V2X参数发生更新。
  10. 根据权利要求6至9中任一项所述的方法，其特征在于，所述方法还包括：
    所述用户数据管理网元向所述V2X控制网元发送更新后的V2X参数。
  11. 一种通信方法，其特征在于，包括：
    策略控制功能PCF网元向用户数据管理网元发送参数下发请求信息，所述参数下发请求信息用于向所述用户数据管理网元请求终端设备的V2X参数；
    所述PCF网元接收所述用户数据管理网元发送的所述V2X参数。
  12. 根据权利要求11所述的方法，其特征在于，所述参数下发请求信息携带所述PCF网元请求所述V2X参数的时刻信息；或者，
    所述参数下发请求信息用于指示所述用户数据管理网元记录接收到所述参数下发请求消息的时刻。
  13. 一种通信方法，其特征在于，包括：
    用户数据管理网元确定终端设备的车辆到所有V2X参数发生更新；
    所述用户数据管理网元向V2X控制网元发送参数更新指示信息，所述参数更新指示信息用于指示所述终端设备的V2X参数发生更新；
    所述V2X控制网元根据所述参数更新指示信息，向所述终端设备发送更新后的V2X参数。
  14. 根据权利要求13所述的方法，其特征在于，所述方法还包括：
    所述V2X控制网元从所述用户数据管理网元获取到更新后的V2X参数。
  15. 根据权利要求13或14所述的方法，其特征在于，所述用户数据管理网元确定终端设备的车辆到所有V2X参数发生更新，包括：
    所述用户数据管理网元接收策略控制功能PCF网元发送的参数下发请求信息，所述参数下发请求信息用于向所述用户数据管理网元请求所述终端设备的V2X参数；
    所述用户数据管理网元根据所述参数下发请求信息确定第一时刻；
    所述用户数据管理网元更新所述终端设备的V2X参数，并获取更新V2X参数的第二时刻；
    所述用户数据管理网元根据所述第一时刻和所述第二时刻确定所述V2X参数发生更新。
  16. 根据权利要求13至15中任一项所述的方法，其特征在于，所述方法还包括：
    策略控制功能PCF网元向所述用户数据管理网元发送参数下发请求信息，所述参数下发请求信息用于向所述用户数据管理网元请求终端设备的V2X参数；
    所述用户数据管理网元接收所述参数下发请求信息，并根据所述参数下发请求信息向所述PCF网元发送所述终端设备的V2X参数；
    所述PCF网元接收所述用户数据管理网元发送的所述终端设备的V2X参数。
  17. 一种通信装置，其特征在于，所述通信装置为车辆到所有V2X控制网元，包括至少一个处理器，所述至少一个处理器用于与存储器耦合，读取并执行所述存储器中的指令，以实现如权利要求1至5中任一项所述的方法。
  18. 根据权利要求17所述的通信装置，其特征在于，所述通信装置还包括：所述存储器。
  19. 一种通信装置，其特征在于，所述通信装置为用户数据管理网元，包括至少一个处理器，所述至少一个处理器用于与存储器耦合，读取并执行所述存储器中的指令，以实现如权利要求6至10中任一项所述的方法。
  20. 根据权利要求19所述的通信装置，其特征在于，所述通信装置还包括：所述存储器。
  21. 一种通信装置，其特征在于，所述通信装置为策略控制功能PCF网元，包括至少一个处理器，所述至少一个处理器用于与存储器耦合，读取并执行所述存储器中的指令，以实现如权利要求11至12中任一项所述的方法。
  22. 根据权利要求21所述的通信装置，其特征在于，所述通信装置还包括：所述存储器。
  23. 一种通信系统，其特征在于，所述通信系统包括：如权利要求17或18所述的车辆到所有V2X控制网元、如权利要求19或20所述的用户数据管理网元。
  24. 根据权利要求23所述的通信系统，其特征在于，所述通信系统还包括：如权利要求21或22所述的策略控制功能PCF网元。
  25. 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，使得计算机执行如权利要求1至5、或者6至10、或者11至12、或者13至16中任意一项所述的方法。
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