Patent ID: 11889330
Assignee: ZTE CORPORATION
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 13:
14. A method for implementing disaster recovery, comprising:
based on determination that a backup Session Management Function (SMF) has taken over a session or sessions in a Common Session endpoint Identifier List (CSIDLIST) corresponding to the backup SMF and a main SMF recovers from a failure, sending, by the main SMF, a third request to a User Plane Function (UPF),
wherein the third request carries a node identifier (Node ID) of the main SMF, a Node ID of the backup SMF, and a CSIDLIST corresponding to the main SMF, a session or sessions in the CSIDLIST corresponding to the backup SMF is/are the same as session or sessions in the CSIDLIST corresponding to the main SMF or is/are a part of the session or sessions in the CSIDLIST corresponding to the main SMF, and the third request is used for notifying the UPF that the main SMF recovers from the failure and that the session or sessions in the CSIDLIST corresponding to the main SMF is/are to be taken over by the main SMF, so that the UPF subsequently interacts with the main SMF for the session or sessions in the CSIDLIST corresponding to the main SMF.