Graceful Termination Call Flow

This section describes Graceful Termination call flow.

Graceful Termination Call Flow
Graceful Termination Call Flow Description

Step

Description

1, 2, 3

Initial attach complete.

4-7

  • UPF sends Sx_Session_Report_Request with report type as GTER and TEID.

  • cnSGW-C responds with Sx_Session_Report_Response.

8-11

cnSGW-C processes Sx_Session_Report_Request and submits internal transaction (T2) to clean up PDN.

  • cnSGW-C sends Sx_Session_Modification_Request to set FAR Action=Drop.

  • UPF responds with Sx_Session_Modification_Response.

12-19

  • Send Delete Bearer Req to MME.

  • Send Delete Session Request to PGW.

20-23

  • Send Sx_Session_Delete_Request.

  • UPF responds with Sx_Session_Delete_Response.