UE Initiated Detach Procedure
The following figure shows the call flow for an UE-initiated release with Diameter interfaces.
The following table describes the detailed procedure of an E-UTRAN UE-initiated detach.
| Step | Description |
|---|---|
| 1 |
MME sends Delete Session Request to S-GW. |
| 2 |
S-GW sends Delete Session Request to SMF. |
|
3 |
SMF sends N4 PFCP Session Deletion Request to UPF to release N4 session. |
|
4 |
UPF sends N4 PFCP Session Deletion Response to SMF. |
|
5 |
SMF sends Delete Session Response to S-GW. |
|
6 |
S-GW sends Delete Session Response to MME. |
|
7 |
SMF sends Radius Accounting Request Stop AAA server to release the accounting session. |
|
8 |
AAA server sends RADIUS Accounting Response to SMF. |
|
9 |
SMF sends Gy Credit Control Request Terminate to OCS to release the Gy session. |
|
10 |
OCS sends Gy Credit Control Answer Terminate to SMF. |
|
11 |
SMF sends Gx Credit Control Request Terminate to PCRF. |
|
12 |
PCRF sends Gx Credit Control Answer Terminate to SMF to release the Gx session. |