AMF-initiated PDU Session Release

The AMF-initiated PDU session release procedure allows the AMF to initiate the release of a PDU session.

The following figure depicts the AMF-initiated PDU session release call flow.

AMF-initiated PDU Session Release Call Flow
AMF-initiated PDU Session Creation Call Flow Description
Step Description
1

The AMF sends SmContextReleaseRequest.

2, 3

The SMF sends N4SessionReleaseRequest to the UPF. The UPF sends response for the same.

4

The SMF sends SmContextReleaseResponse to the AMF.

5, 6

The SMF sends delete charging request to the CHF. The CHF responds back to the SMF with delete response.

7, 8

The SMF sends delete request to the PCF. The PCF responds back to the SMF with delete response.

9, 10

The SMF sends UDM deregistration request. The UDM responds back to the SMF with deregistration response.