Section: 4.2.8.5.3 Network Functions
Content: Trusted WLAN Access Point (TWAP): It is a particular type of a Trusted Non-3GPP Access Point (TNAP) specified in clause 4.2.8.2, that supports a WLAN access technology, e.g. IEEE 802.11. This function is outside the scope of the 3GPP specifications. Trusted WLAN Interworking Function (TWIF): It provides interworking functionality that enables N5CW devices to access 5GC. The TWIF supports the following functions: - Terminates the N1, N2 and N3 interfaces. - Implements the AMF selection procedure. - Implements the NAS protocol stack and exchanges NAS messages with the AMF on behalf of the N5CW device. - On the user plane, it relays protocol data units (PDUs) between the Yw interface and the N3 interface. - May implement a local mobility anchor within the trusted WLAN access network.