gNB-Initiated UE Context Release Procedure Call Flow

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

gNB-Initiated UE Context Release Procedure Call Flow
gNB-Initiated UE Context Release Procedure Call Flow Description

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.