How it Works
This section describes how this feature works.
The cnSGW-C performs the following actions while processing the UE-triggered service request:
-
Sends the Sx Modification Request message to the UPF to:
-
Mark downlink Forwarding Action Rule (FAR) as forward.
-
Update the S1 eNodeB-F TEID information to UPF sends the downlink packets to eNodeB.
-
-
After receiving the Sx Modify Response message from the UPF, cnSGW-C:
-
Sends the Modify Bearer Response message to MME.
-
Checks User Location Information (ULI) or UE time zone. For any change in the time zone, it sends Modify Bearer Request to PGW to update the TAI. The UE-triggered service request with PGW interaction request only considers ULI or UE time zone check.
-