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:
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SGW sends a Sx Session Deletion Request to User Plane.
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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:
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SGW sends the Sx Session Modification Request to the User Plane.
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User Plane sends the Sx Session Modification Response to SGW.
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SGW sends the Delete Bearer Request to MME.
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SGW sends the Delete Session Request to PGW.
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MME sends the Delete Bearer Response to SGW.
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PGW sends the Delete Session Response to SGW.
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SGW sends the Sx Session Deletion Request to User Plane.
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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.