Communication method and communications device

1. An apparatus, comprising:

at least one processor; and

one or more memories coupled to the at least one processor and storing programming instructions for execution by the at least one processor, the programming instructions instructing the at least one processor to perform operations comprising:

obtaining a media access control (MAC) address of a terminal and first route information of an interface between a user plane function network element device and a data network, wherein the MAC address is bound to a session, and the interface corresponds to the session; and

sending the MAC address and the first route information to an application function network element device.

2. The apparatus according to claim 1 , wherein the first route information comprises:

first identification information of a tunnel associated with the session, or

destination information indicating a destination address to which downlink data is routed.

3. The apparatus according to claim 1 , wherein the interface is an N6 interface.

4. The apparatus according to claim 1 , wherein the first route information is for a determination of a transmission path of downlink data from the data network to the user plane function network element device.

5. The apparatus according to claim 4 , wherein a destination MAC address of the downlink data is the same as the MAC address.

6. The apparatus according to claim 1 , wherein the terminal is a terminal requesting to create the session.

7. The apparatus according to claim 1 , wherein the terminal is a terminal accessing the session by using a second terminal, and the second terminal is a terminal requesting to create the session.

8. A communication system, wherein the communication system comprises a user plane function network element device and a session management function network element device;

wherein the user plane function network element device is configured to:

detect a media access control (MAC) address of a terminal, wherein the MAC address is bound to a session; and

send the MAC address to the session management function network element device; and

wherein the session management function network element device is configured to:

receive the MAC address from the user plane function network element device;

obtain first route information of an interface between the user plane function network element device and a data network, wherein the interface corresponds to the session; and

send the MAC address and the first route information to an application function network element device.

9. The communication system according to claim 8 , wherein the first route information comprises:

first identification information of a tunnel associated with the session, or

destination information indicating a destination address to which downlink data is routed.

10. The communication system according to claim 8 , wherein the interface is an N6 interface.

11. The communication system according to claim 8 , wherein the first route information is for a determination of a transmission path of downlink data from the data network to the user plane function network element device.

12. The communication system according to claim 11 , wherein a destination MAC address of the downlink data is the same as the MAC address.

13. The communication system according to claim 8 , wherein the terminal is a terminal requesting to create the session.

14. The communication system according to claim 8 , wherein the terminal is a terminal accessing the session by using a second terminal, and the second terminal is a terminal requesting to create the session.

15. A communication system, wherein the communication system comprises a user plane function network element device and an application function network element device;

wherein the user plane function network element device is configured to:

detect a media access control (MAC) address of a terminal, wherein the MAC address is bound to a session; and

send the MAC address to a session management function network element device; and

wherein the application function network element device is configured to:

receive the MAC address and first route information of an interface between the user plane function network element device and a data network from the session management function network element device; and

determine a transmission path of downlink data based on the first route information, wherein the transmission path is a path from the data network to the user plane function network element device.

16. The communication system according to claim 15 , wherein the first route information comprises:

first identification information of a tunnel associated with the session, or

destination information indicating a destination address to which the downlink data is routed.

17. The communication system according to claim 15 , wherein the interface is an N6 interface.

18. The communication system according to claim 15 , wherein a destination MAC address of the downlink data is the same as the MAC address.

19. The communication system according to claim 15 , wherein the terminal is a terminal requesting to create the session.

20. The communication system according to claim 15 , wherein the terminal is a terminal accessing the session by using a second terminal, and the second terminal is a terminal requesting to create the session.

21. The communication system according to claim 15 , wherein the communication system further comprises the session management function network element device;

wherein the session management function network element device is configured to:

receive the MAC address from the user plane function network element device;

obtain the first route information; and

send the MAC address and the first route information to the application function network element device.

22. A communication method, comprising:

receiving, by an application function network element device from a session management function network element device, a media access control (MAC) address of a terminal and first route information of an interface between a user plane function network element device and a data network, wherein the MAC address is bound to a session, and the interface corresponds to the session; and

determining, by the application function network element device, a transmission path of downlink data based on the first route information; wherein the transmission path is a path from the data network to the user plane function network element device.

23. The method according to claim 22 , wherein the first route information of the interface comprises:

first identification information of a tunnel associated with the session, or

destination information indicating a destination address to which the downlink data is routed.

24. The method according to claim 22 , wherein a destination MAC address of the downlink data is the same as the MAC address.

25. The method according to claim 22 , wherein the terminal is a terminal requesting to create the session.

26. The method according to claim 22 , wherein the terminal is a terminal accessing the session by using a second terminal, and the second terminal is a terminal requesting to create the session.

27. The method according to claim 22 , wherein the interface is an N6 interface.

28. The method according to claim 22 , further comprising:

sending, by the user plane function network element device, the MAC address to the session management function network element device.

29. The method according to claim 28 , further comprising:

receiving, by the session management function network element device, the MAC address from the user plane function network element device;

obtaining, by the session management function network element device, the first route information; and

sending, by the session management function network element device, the MAC address and the first route information to the application function network element device.

30. A communication method, comprising:

obtaining, by a session management function network element device, a media access control (MAC) address of a terminal and first route information of an interface between a user plane function network element device and a data network, wherein the MAC address is bound to a session, and the interface corresponds to the session; and

sending, by the session management function network element device, the MAC address and the first route information to an application function network element device.

31. The method according to claim 30 , wherein the first route information comprises:

first identification information of a tunnel associated with the session, or

destination information indicating a destination address to which downlink data is routed.

32. The method according to claim 30 , wherein the interface is an N6 interface.

33. The method according to claim 30 , wherein the first route information is for a determination of a transmission path of downlink data from the data network to the user plane function network element device.

34. The method according to claim 33 , wherein a destination MAC address of the downlink data is the same as the MAC address.

35. The method according to claim 30 , wherein the terminal is a terminal requesting to create the session.

36. The method according to claim 30 , wherein the terminal is a terminal accessing the session by using a second terminal, and the second terminal is a terminal requesting to create the session.

37. The method according to claim 30 , further comprising:

sending, by the user plane function network element device, the MAC address to the session management function network element device.