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

Claim 4:
5. The method according to claim 4, after acquiring, by the backup SMF, the context of the session or sessions in the CSIDLIST corresponding to the backup SMF from the UDSF, further comprising:
sending, by the backup SMF, a second request to the UPF,
wherein the second request carries a Control Plane (CP) Fully Qualified Session Endpoint Identifier (F-SEID) acquired from the context, an Internet Protocol (IP) address in the CP F-SEID being updated to an IP address of the backup SMF; and the second request is used for notifying the UPF to record the updated CP F-SEID for the session or sessions in the CSIDLIST, and set a migration flag for the session or sessions in the CSIDLIST, wherein the migration flag is used for identifying the corresponding session or sessions as migrated session or sessions.