Message sending method and apparatus

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

sending, by a terminal device, second identification information to a network device, wherein the second identification information is used to request the network device to configure a device-to-device (D2D) direct communication resource pool for a first communication path;

receiving, by the terminal device, configuration information of the D2D direct communication resource pool from the network device;

establishing, by the terminal device, a communication connection that is based on a second communication path;

determining, by the terminal device, a communication path for a V2X service, wherein the communication path is selected from at least two communication paths, the at least two communication paths comprise the first communication path and the second communication path, the first communication path is a communication path on which communication is performed using a PC5 interface, and the second communication path is a communication path on which communication is performed using a Uu interface that is configured for a message of the V2X service independently of other Uu traffic; and

sending, by the terminal device, the message of the V2X service using the communication path.

2. The method according to claim 1 , wherein determining the communication path for the V2X service comprises:

receiving, by the terminal device, indication information from the network device, wherein the indication information is used to indicate the communication path for the V2X service, and the communication path indicated by the indication information is selected by the network device from the at least two communication paths; and

determining, by the terminal device, the communication path based on the indication information.

3. The method according to claim 1 , further comprising: before determining the communication path for the V2X service,

sending, by the terminal device, first identification information to the network device, wherein the first identification information is used to request the network device to indicate the communication path for the V2X service.

4. The method according to claim 1 , further comprising: before determining the communication path for the V2X service,

sending, by the terminal device, message type information of the V2X service to the network device; or

sending, by the terminal device, radio environment measurement information of the first communication path, or radio environment measurement information of the second communication path to the network device.

5. The method according to claim 1 ,

wherein the communication path indicated by the indication information is the first communication path; and

further comprising: before sending the message of the V2X service using the communication path,

receiving, by the terminal device, configuration information of the D2D direct communication resource pool from the network device, wherein the D2D direct communication resource pool is configured for the first communication path.

6. The method according to claim 1 , wherein determining the communication path for the V2X service comprises:

selecting, by the terminal device, the communication path from the at least two communication paths.

7. The method according to claim 6 , wherein selecting the communication path from the at least two communication paths comprises:

selecting, by the terminal device, the communication path from the at least two communication paths based on message type information of the V2X service; or

selecting, by the terminal device, the communication path from the at least two communication paths based on radio environment measurement information of the first communication path, or radio environment measurement information of the second communication path.

8. The method according to claim 5 , wherein the D2D direct communication resource pool comprises a dedicated resource pool.

9. The method according to claim 3 , wherein sending the first identification information to the network device comprises:

sending, by the terminal device, the first identification information to the network device using a first radio resource control (RRC) dedicated message.

10. An apparatus, comprising:

a memory storing program instructions; and

a processor coupled to the memory;

wherein when executed by the processor, the instructions cause the processor to:

send second identification information to a network device, wherein the second identification information is used to request the network device to configure a device-to-device (D2D) direct communication resource pool for the first communication path,

receive configuration information of the D2D direct communication resource pool from the network device,

establish a communication connection that is based on the second communication path,

determine a communication path for a vehicle-to-everything (V2X) service, wherein the communication path is selected from at least two communication paths, the at least two communication paths comprise the first communication path and a the second communication path, the first communication path is a communication path on which communication is performed using a PC5 interface, and the second communication path is a communication path on which communication is performed using a Uu interface that is configured for a message of the V2X service independently of other Uu traffic, and

send a message of the V2X service using the communication path.

11. The apparatus according to claim 10 , wherein to determine the communication path for the V2X service, the instructions further cause the processor to:

receive indication information from the network device, wherein the indication information is used to indicate the communication path for the V2X service, and the communication path indicated by the indication information is selected by the network device from the at least two communication paths; and

determine the communication path based on the indication information.

12. The apparatus according to claim 10 , wherein before determining the communication path for the V2X service, the instructions further cause the processor to:

send first identification information to the network device, wherein the first identification information is used to request the network device to indicate a communication path for the V2X service.

13. The apparatus according to claim 10 , wherein before determining the communication path for the V2X service, the instructions further cause the processor to:

send message type information of the V2X service to the network device; or

send radio environment measurement information of the first communication path, or radio environment measurement information of the second communication path to the network device.

14. The apparatus according to claim 10 , wherein the communication path indicated by the indication information is the first communication path; and wherein the instructions further cause the processor to:

receive configuration information of an D2D direct communication resource pool from the network device, wherein the D2D direct communication resource pool is configured for the first communication path.

15. The apparatus according to claim 10 , wherein to determine the communication path for the V2X service, the instructions further cause the processor to:

select the communication path from the at least two communication paths.

16. The apparatus according to claim 15 , wherein to select the communication path from the at least two communication paths, the instructions further cause the processor to:

select the communication path from the at least two communication paths based on message type information of the V2X service; or

select the communication path from the at least two communication paths based on radio environment measurement information of the first communication path, or radio environment measurement information of the second communication path.

17. The apparatus according to claim 14 , wherein the D2D direct communication resource pool comprises a dedicated resource pool.

18. A non-transitory computer-readable storage medium comprising instructions which, when executed by a computer, cause the computer to perform operations, the operations comprising:

sending, by a terminal device, second identification information to a network device, wherein the second identification information is used to request the network device to configure a device-to-device (D2D) direct communication resource pool for a first communication path;

receiving, by the terminal device, configuration information of the D2D direct communication resource pool from the network device;

establishing, by the terminal device, a communication connection that is based on a second communication path;

determining a communication path for a vehicle-to-everything (V2X) service, wherein the communication path is selected from at least two communication paths, the at least two communication paths comprise the first communication path and the second communication path, the first communication path is a communication path on which communication is performed using a PC5 interface, and the second communication path is a communication path on which communication is performed using a Uu interface that is configured for a message of the V2X service independently of other Uu traffic; and

sending a message of the V2X service by using the communication path.

19. The non-transitory computer-readable storage medium of claim 18 , wherein determining the communication path for the V2X service comprises:

receiving, by the terminal device, indication information from the network device, wherein the indication information is used to indicate the communication path for the V2X service, and the communication path indicated by the indication information is selected by the network device from the at least two communication paths; and

determining, by the terminal device, the communication path based on the indication information.

20. The non-transitory computer-readable storage medium of claim 18 , further comprising: before determining the communication path for the V2X service,

sending, by the terminal device, first identification information to the network device, wherein the first identification information is used to request the network device to indicate the communication path for the V2X service.