N1/NAS Interface

The N1 interface is the reference point between the User Equipment (UE) and the Access and Mobility Management Function (AMF). This interface is used to transfer UE information, which is related to connection, mobility and sessions, to the AMF.

For session management, PDU sessions are established upon UE request, modified upon UE and 5GC request, and released upon UE and 5GC request through the NAS SM signalling. This signalling is exchanged over N1 interface between the UE and the SMF.