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

Claim 10:
11. The method according to claim 9,
after recording, by the UPF, the correspondence table between the main SMF and the backup SMF according to the first request, or after sending, by the UPF, the first response for accepting the first request to the SMF, further comprising: receiving, by the UPF, a second request sent by the backup SMF, wherein the second request carries a Control Plane (CP) Fully Qualified Session Endpoint Identifier (F-SEID), 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 corresponding to the backup SMF, and set a migration flag for the session or sessions in the CSIDLIST corresponding to the backup SMF, wherein the migration flag is used for identifying the corresponding session or sessions as migrated session or sessions; and recording, by the UPF, the updated CP F-SEID for the session or sessions in the CSIDLIST corresponding to the backup SMF according to the second request, and setting, in the correspondence table by the UPF, the migration flag for the session or sessions in the CSIDLIST;
or,
after setting, by the UPF, the state of the main SMF in the stored correspondence table between the main SMF and the backup SMF to normal according to the third request, or after sending, by the UPF, the third response for accepting the third request to the SMF, further comprising: receiving, by the UPF, a fourth request sent by the backup SMF, wherein the fourth request carries a Control Plane (CP) Fully Qualified Session Endpoint Identifier (F-SEID), an Internet Protocol (IP) address in the CP F-SEID being updated to an IP address of the main SMF; and the fourth request is used for notifying the UPF to record the updated CP F-SEID for the session or sessions in the CSIDLIST corresponding to the main SMF, and remove, from the correspondence table, a migration flag of the session or sessions in the CSIDLIST; and recording, by the UPF, the updated CP F-SEID for the session or sessions in the CSIDLIST corresponding to the main according to the fourth request, and removing, from the correspondence table by the UPF, the migration flag of the session or sessions in the CSIDLIST.