5.5.2.2.4 UE-initiated de-registration procedure completion for 5GS services over non-3GPP access

If the access type in the DEREGISTRATION REQUEST indicates that the de-registration procedure is for non-3GPP access, the AMF shall trigger SMF to perform a local release of the PDU session(s) established over non-3GPP access, if any, for this UE. The UE shall perform a local release of the PDU session(s) established over non-3GPP access, if any. If there is an MA PDU session with user plane resources established on both 3GPP access and non-3GPP access in the same PLMN or in different PLMNs, the AMF shall trigger SMF to perform release of user plane resources on non-3GPP access, and the UE shall consider the user plane resources on non-3GPP access as released. If there is an MA PDU session with a PDN connection as a user-plane resource and user plane resources established on non-3GPP access, the AMF shall trigger SMF to perform release of user plane resources on non-3GPP access, and the UE shall consider the user plane resources on non-3GPP access as released. If the UE has an MA PDU session with user plane resources established on non-3GPP access only, the AMF shall trigger the SMF to perform a local release of the MA PDU session, and the UE shall perform a local release of the MA PDU session. The UE is marked as inactive in the AMF for 5GS services for non-3GPP access. The AMF shall enter the state 5GMM-DEREGISTERED over non-3GPP access.

If the de-registration request is not due to switch off, the UE shall:

• if the de-registration procedure was performed due to disabling of 5GS services, enter the 5GMM-NULL state for non-3GPP access;
• otherwise, enter the 5GMM-DEREGISTERED state for non-3GPP access.

NOTE: Case b) is applicable when the UE is also registered over 3GPP access.