How it Works

This section describes how this feature works.

When the cnSGW-C receives the admin-initiated Deletion Request with the purge option as “true”, it initiates Sx signaling towards User Plane and exchanges following messages:

  1. SGW sends a Sx Session Deletion Request to User Plane.

  2. User Plane sends a Sx Session Deletion Response SGW.

When cnSGW-C receives the Deletion Request with the purge option as “false”, it performs the Sx signaling towards User Plane and GTP-C signaling towards MME and PGW. The cnSGW-C exchanges the following messages with User Plane, MME, and PGW:

  1. SGW sends the Sx Session Modification Request to the User Plane.

  2. User Plane sends the Sx Session Modification Response to SGW.

  3. SGW sends the Delete Bearer Request to MME.

  4. SGW sends the Delete Session Request to PGW.

  5. MME sends the Delete Bearer Response to SGW.

  6. PGW sends the Delete Session Response to SGW.

  7. SGW sends the Sx Session Deletion Request to User Plane.

  8. User Plane sends the Sx Session Deletion Response to SGW.

cnSGW-C sends the Delete Session Request towards PGW and Delete Bearer Request towards MME. After receiving the response from both remote peers, the cnSGW-C sends Sx Session Deletion Request towards User Plane to clear the sessions.