UE Initiated Detach Procedure

The following figure shows the call flow for an UE-initiated release with Diameter interfaces.

Call Flow for UE Initiated Release with Diameter Interfaces

The following table describes the detailed procedure of an E-UTRAN UE-initiated detach.

Call Flow Description for UE Initiated Release with Diameter Interfaces
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.