RADIUS-initiated Detach Procedure

The following figure shows the call flow for E-UTRAN RADIUS disconnect messages.

Call Flow for RADIUS-initiated Detach
Call Flow Description for RADIUS-initiated Detach
Step Description
1

AAA Radius Disconnect Message to SMF.

2

SMF sends back Radius Disconnect acknowledgment.

3

SMF sends PCRF Session Modification Request (Update FAR with DROP) to UPF.

4

UPF responds to SMF with PCRF Session Modification Response.

5

SMF sends Delete Bearer Request to S-GW

6

S-GW forwards Delete Bearer Request to MME.

7

MME responds to S-GW with Delete Bearer Response.

8

S-GW forwards Delete Bearer Response to SMF.

9

SMF sends PCRF Session Deletion Request to UPF.

10

UPF responds to SMF with PCRF Session Deletion Response.

11

SMF sends CCR-T to OCS.

12

SMF sends Accounting Request(Stop) to AAA.

13

OCS responds to SMF with CCA-T.

14

SMF responds to AAA with Accounting Response(Stop).

14

SMF sends CCR-T to PCRF.

15

PCRF responds to SMF with CCA-T.