Delete Session Procedure Call Flow
This section describes the delete session procedure call flow.

Step |
Description |
---|---|
1 |
MME receives an indication of Cancel Location from HSS. MME creates Delete Session Request message to SGW (cnSGW-C). It includes RAN/NAS cause code list. |
2 |
SGW (cnSGW-C) forwards the Delete Session Request message request to PGW. It detects and forwards RAN/NAS cause code list. |
3 |
PGW sends the Delete Session Response message to SGW (cnSGW-C). PGW receives IP-CAN session modification request from PCEF. |
4 |
SGW (cnSGW-C) generates a Delete Session Response message towards MME. |