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

Claim 2:
3. The method according to claim 1, before sending, by the backup SMF, the first request to the UPF, further comprising:
receiving, by the backup SMF, a notification message sent by a Network Function Repository Function (NRF),
wherein the notification message carries the Node ID of the main SMF, the Node ID of the backup SMF, and the CSIDLIST corresponding to the backup SMF, and the notification message is used for notifying the backup SMF that the main SMF fails and the backup SMF takes over the session or sessions in the CSIDLIST corresponding to the backup SMF; and
acquiring, through an Unstructured Data Storage Function (UDSF) by the backup SMF, address information of the UPF that has established at least one session with the main SMF.