gNB-Initiated UE Context Release Procedure Call Flow
This section describes the gNB-Initiated UE Context Release Procedure call flow.

Step |
Description |
---|---|
1 |
The AMF receives the UE Context Release Request from the gNB. |
2 |
The AMF sends the UE Context Release Command to the gNB. |
3 |
The AMF receives the UE Context Release Complete from the gNB. |
4 |
The SmContextUpdate procedure is started for all the existing PDU sessions of the subscriber. |
5 |
Once the SmContextUpdate is complete, the UE is moved to the IDLE state. |
6 |
The NGAP EP sends the Context Release Complete to the AMF Service. The T3512 timer is started when processing this message. |
7 |
On expiry of the T3512 timer, the UE Detach Timer is started. |
8 |
On expiry of the UE Detach Timer, the deregistration procedure is triggered. |
9 |
The SMF sends the 204 message to the REST EP. |
10 |
The REST EP sends the PSM Context Update Response message to the AMF Service. |