Section: 6.2.9A TNGF
Content: The functionality of TNGF in the case of trusted non-3GPP access includes the following: - Terminates the N2 and N3 interfaces. - Terminates the EAP-5G signalling and behaves as authenticator when the UE attempts to register to 5GC via the TNAN. - Implements the AMF selection procedure. - Transparently relays NAS messages between the UE and the AMF, via NWt. - Handles N2 signalling with SMF (relayed by AMF) for supporting PDU sessions and QoS. - Transparently relays PDU data units between the UE and UPF(s). - Implements a local mobility anchor within the TNAN. - Packet marking in the downlink, and the uplink on N2 and N3, as for the N3IWF (clause 6.2.9).