Communication method and communications apparatus

1. A communication method, comprising:

receiving, by a first radio network management function network element, information about a first access network element from the first access network element, wherein the first radio network management function network element supports a function of performing service invocation with a first core network element through a first service-based interface; and

performing, by the first radio network management function network element, service invocation with the first access network element through a second service-based interface based on the information about the first access network element, wherein the first service-based interface and the second service-based interface are different interfaces, and the first service-based interface and the second service-based interface are used for realizing communication between the first access network element and the first core network element.

2. The method of claim 1 , wherein the information about the first access network element comprises at least one of: an identifier of the first access network element, a routing address of the first access network element, a public land mobile network (PLMN) served by the first access network element, an identifier of a cell served by the first access network element, or a radio access type (RAT) supported by the first access network element.

3. The method of claim 1 , further comprising:

sending, by the first radio network management function network element to a network repository function network element, at least one of: an identifier of the first radio network management function network element, a routing address of the first radio network management function network element, a PLMN served by the first radio network management function network element, an identifier of a cell served by the first radio network management function network element, or a RAT supported by the first radio network management function network element.

4. The method of claim 3 , further comprising:

determining, by the first radio network management function network element, the network repository function network element based on configuration information in the first radio network management function network element; or

determining, by the first radio network management function network element, the network repository function network element by querying a domain name system server.

5. The method of claim 1 , further comprising:

receiving, by the first radio network management function network element, user equipment measurement information from a second access network element that serves user equipment;

determining, by the first radio network management function network element, a target network element based on the user equipment measurement information;

receiving, by the first radio network management function network element, user equipment context information from the second access network element; and

sending, by the first radio network management function network element, the user equipment context information to the target network element.

6. The method of claim 5 , wherein the target network element is a third access network element, a second radio network management function network element, or a second core network element.

7. The method of claim 6 , wherein if the target network element is the second radio network management function network element or the second core network element, the determining the target network element based on the user equipment measurement information comprises:

determining, by the first radio network management function network element, the target network element based on the user equipment measurement information by using configuration information in the first radio network management function network element; or

determining, by the first radio network management function network element, the target network element based on the user equipment measurement information by querying a network repository function network element.

8. A communication method, comprising:

sending, by an access network element, information about the access network element to a radio network management function network element that supports a function of performing service invocation with a core network element through a first service-based interface, wherein the information about the access network element is used by the radio network management function network element to perform service invocation with the access network element through a second service-based interface; and

performing, by the access network element, service invocation with the radio network management function network element through the second service-based interface, wherein the first service-based interface and the second service-based interface are different interfaces, and the first service-based interface and the second service-based interface are used for realizing communication between the access network element and the core network element.

9. The method of claim 8 , wherein the information about the access network element comprises at least one of: an identifier of the access network element, a routing address of the access network element, a public land mobile network (PLMN) served by the access network element, an identifier of a cell served by the access network element, or a radio access type (RAT) supported by the access network element.

10. The method of claim 8 , further comprising:

determining, by the access network element, the radio network management function network element based on configuration information in the access network element;

or

determining, by the access network element, the radio network management function network element by querying a domain name system (DNS) server.

11. The method of claim 8 , further comprising:

receiving, by the access network element, user equipment measurement information from user equipment; and

sending, by the access network element, the user equipment measurement information to the radio network management function network element.

12. A communication method, comprising:

receiving, by a network repository function network element, information about a first radio network management function network element from the first radio network management function network element; and

performing, by the network repository function network element, service invocation with the first radio network management function network element through a first service-based interface based on the information about the first radio network management function network element,

wherein the first radio network management function network element supports a function of performing service invocation with an access network element through a second service-based interface, wherein the first service-based interface and the second service-based interface are different interfaces.

13. The method of claim 12 , wherein the information about the first radio network management function network element comprises at least one of: an identifier of the first radio network management function network element, a routing address of the first radio network management function network element, a PLMN served by the first radio network management function network element, an identifier of a cell served by the first radio network management function network element, or a RAT supported by the first radio network management function network element.

14. The method of claim 12 , further comprising:

finding, by the network repository function network element through querying for the first radio network management function network element, a target network element that serves user equipment.

15. The method of claim 14 , wherein the target network element is a second radio network management function network element or a second core network element.