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.