Service message sending method, terminal device, and network device

1. A vehicle to everything (V2X) service message sending method, comprising:

receiving, by a terminal device, communications interface configuration information from a network-side device, wherein the communications interface configuration information comprises interface indication information to indicate at least one communications interface used to send a V2X service message and a communications interface trigger condition to trigger when the at least one communications interface is to be used;

determining, by the terminal device based on the communications interface configuration information, a communications interface from at least two communications interfaces used to send a V2X service message; and

sending, by the terminal device, the V2X service message through the determined communications interface.

2. The method according to claim 1 , wherein

the at least two communications interfaces used to send a V2X service message comprise a PC5 interface and a Uu interface, and the interface indication information is used to indicate at least one of the PC5 interface and the Uu interface.

3. The method according to claim 2 , wherein

the interface indication information indicates a first communications interface, and the first communications interface is the PC5 interface or the Uu interface; and

wherein the determining, by the terminal device based on the communications interface configuration information, a communications interface from at least two communications interfaces used to send a V2X service message comprises:

determining, by the terminal device, the first communications interface to send the V2X service message.

4. The method according to claim 2 , wherein

the interface indication information indicates at least one communications interface having the PC5 interface and the Uu interface, and the communications interface configuration information further comprises the communications interface trigger condition for determining the PC5 interface or the Uu interface; and

wherein the determining, by the terminal device based on the communications interface configuration information, a communications interface from at least two communications interfaces used to send a V2X service message comprises:

determining, by the terminal device, one of the PC5 interface and the Uu interface as the communications interface when determining that the communications interface trigger condition is met.

5. The method according to claim 4 , wherein

the determining, by the terminal device, one of the PC5 interface and the Uu interface as a communications interface when determining that the communications interface trigger condition is met comprises:

determining, by the terminal device, the PC5 interface as the communications interface when determining that one or more of the following conditions are met:

radio environment measurement information corresponding to the PC5 interface is lower than a first threshold;

radio environment measurement information corresponding to the Uu interface is lower than a second threshold;

quality of communication currently performed by using the Uu interface does not meet a specific requirement;

a message to be transmitted is a cooperative awareness message (CAM) or a basic safety message (BSM); and

a link exception between the terminal device and the network-side device occurs, wherein the link exception comprises at least one of a radio link failure (RLF), a handover failure (HOF), or out of coverage (OoC).

6. The method according to claim 4 , wherein

the determining, by the terminal device, one of the PC5 interface and the Uu interface as a communications interface when determining that the communications interface trigger condition is met comprises:

determining, by the terminal device, the Uu interface as the communications interface when determining that one or more of the following conditions are met:

radio environment measurement information corresponding to the PC5 interface is higher than a first threshold;

radio environment measurement information corresponding to the Uu interface is higher than a second threshold;

quality of communication currently performed by using the PC5 interface does not meet a specific requirement; and

a message to be transmitted is a decentralized environmental notification message (DENM) or an Internet of Vehicles data Telematics message.

7. A vehicle to everything (V2X) service message sending method, comprising:

generating, by a network-side device, communications interface configuration information, wherein the communications interface configuration information comprises interface indication information to indicate at least one communications interface used by a terminal device to send a V2X service message and a communications interface trigger condition to trigger when the at least one communications interface is to be used; and

sending, by the network-side device, the communications interface configuration information, wherein the communications interface configuration information is used by the terminal device to determine a communications interface from at least two communications interfaces used to send a V2X service message, and the determined communications interface is used by the terminal device to send the V2X service message.

8. The method according to claim 7 , wherein

the at least two communications interfaces used to send a V2X service message comprise a PC5 interface and a Uu interface, and the interface indication information is used to indicate at least one of the PC5 interface and the Uu interface.

9. The method according to claim 7 , wherein

the interface indication information indicates a first communications interface, the first communications interface is a PC5 interface or a Uu interface, and the first communications interface is used by the terminal device to send the V2X service message.

10. The method according to claim 7 , wherein

the interface indication information indicates at least one communications interface having a PC5 interface and a Uu interface, and the communications interface configuration information further comprises the communications interface trigger condition for determining the PC5 interface or the Uu interface; and

the communications interface trigger condition is used by the terminal device to determine one of the PC5 interface and the Uu interface as a communications interface.

11. The method according to claim 10 , wherein

the communications interface trigger condition comprises one or more of the following conditions:

radio environment measurement information corresponding to the PC5 interface is lower than a first threshold;

radio environment measurement information corresponding to the Uu interface is lower than a second threshold;

quality of communication currently performed by using the Uu interface does not meet a specific requirement;

a message to be transmitted is a cooperative awareness message (CAM) or a basic safety message (BSM); and

a link exception between the terminal device and the network-side device occurs, wherein the link exception comprises at least one of a radio link failure (RLF), a handover failure (HOF), or out of coverage (OoC).

12. The method according to claim 10 , wherein

the communications interface trigger condition comprises one or more of the following conditions:

radio environment measurement information corresponding to the PC5 interface is higher than a first threshold;

radio environment measurement information corresponding to the Uu interface is higher than a second threshold;

quality of communication currently performed by using the PC5 interface does not meet a specific requirement; and

a message to be transmitted is a decentralized environmental notification message (DENM) or an Internet of Vehicles data Telematics message.

13. An apparatus, comprising:

a receiver, configured to receive communications interface configuration information from a network-side device, wherein the communications interface configuration information comprises interface indication information, and the interface indication information is used to indicate at least one communications interface used by a transmitter to send a vehicle to everything (V2X) service message and a communications interface trigger condition to trigger when the at least one communications interface is to be used;

a processor, configured to determine, based on the communications interface configuration information, a communications interface from at least two communications interfaces used to send a V2X service message; and

the transmitter, configured to send the V2X service message through the determined communications interface.

14. The apparatus according to claim 13 , wherein

the at least two communications interfaces used to send a V2X service message comprise a PC5 interface and a Uu interface, and the interface indication information is used to indicate at least one of the PC5 interface and the Uu interface.

15. The apparatus according to claim 14 , wherein

the interface indication information indicates a first communications interface, and the first communications interface is the PC5 interface or the Uu interface;

the processor determines the first communications interface; and

the transmitter sends the V2X service message through the first communications interface.

16. The apparatus according to claim 14 , wherein

the interface indication information indicates at least one communications interface, the at least one communications interface comprises the PC5 interface and the Uu interface, and the communications interface configuration information further comprises the communications interface trigger condition for determining the PC5 interface or the Uu interface; and

the processor is configured to determine one of the PC5 interface and the Uu interface as a communications interface when determining that the communications interface trigger condition is met.

17. The apparatus according to claim 16 , wherein

the processor is further configured to determine the PC5 interface as the communications interface when determining that one or more of the following communications interface trigger conditions are met:

radio environment measurement information corresponding to the PC5 interface is lower than a first threshold;

radio environment measurement information corresponding to the Uu interface is lower than a second threshold;

quality of communication currently performed by using the Uu interface does not meet a specific requirement;

a type of a message to be transmitted is a cooperative awareness message (CAM) or a basic safety message (BSM); and

a link exception between the terminal device and the network-side device occurs, wherein the link exception comprises at least one of a radio link failure (RLF), a handover failure (HOF), or out of coverage (OoC).

18. The apparatus according to claim 16 , wherein

the processor is further configured to determine the Uu interface as the communications interface when determining that one or more of the following communications interface trigger conditions are met:

radio environment measurement information corresponding to the PC5 interface is higher than a first threshold;

radio environment measurement information corresponding to the Uu interface is higher than a second threshold;

quality of communication currently performed by using the PC5 interface does not meet a specific requirement; and

a message to be transmitted is a decentralized environmental notification message (DENM) or an Internet of Vehicles data Telematics message.

19. The apparatus according to claim 13 , wherein

the communications interface configuration information is carried in system information or a radio resource control (RRC) dedicated message.

20. The apparatus according to claim 13 , wherein

the processor is configured to: if determining that a communications interface currently used by the V2X service message is a communications interface different from the determined communications interface, stop the transmitter from sending the V2X service message through the currently used communications interface; and

the transmitter is configured to send the V2X service message through the determined one communications interface.