4.23.15 PDU Session mobility between 3GPP and non-3GPP access

23.5023GPPProcedures for the 5G System (5GS)Release 18TS

In this Release of the specification, deployments topologies with specific SMF Service Areas apply only for 3GPP access.

At PDU Session mobility from 3GPP to non-3GPP access, an I-SMF may need to be removed because an I-SMF had been inserted when the PDU Session was served over 3GPP access.

At PDU Session mobility from non-3GPP to 3GPP access, an I-SMF may need to be inserted because the TA associated with the UE location over 3GPP requires the AMF to insert an I-SMF.