name: TWIF
full_form: Trusted WLAN Interworking Function
context: Request and provides the AN key to TWIF. In turn, the TWIF derives a Pairwise Master Key (PMK) from the AN key and sends the PMK key and the EAP-Success message to the Trusted WLAN Access Point, which forwards the EAP-Success to the UE. The PMK is the key used to secure the WLAN air-interface communication according to IEEE 802.11i [9] (now incorporated into IEEE 802.11 4]). A layer-2 or layer-3 connection is established between the Trusted WLAN Access Point and the TWIF for transporting all user-plane traffic of the UE to TWIF. This connection is later bound to an N3 connection that is created for this UE. 10. Finally, the AMF sends a Registration Accept message to TWIF At this point, the UE is connected to the WLAN access network.. Steps 20-21: PDU Session Establishment. This procedure is compliant with TS 23.502 [3] Figure 4.3.2.2.1-1 with the TWIF acting both as the AN and as the UE. Step 25: User plane communication.
description: The Trusted WLAN Interworking Function (TWIF) is a network function that enables secure interworking between the 5G core network and a trusted WLAN access network. It derives a Pairwise Master Key (PMK) from an Access Network (AN) key, sends the PMK to the Trusted WLAN Access Point, and establishes a layer-2 or layer-3 connection for transporting user-plane traffic.
explanation: TWIF is classified as a Network Function because it performs specific tasks within a telecommunications network, such as key derivation and connection establishment, to facilitate secure communication between the 5G core network and a trusted WLAN access network.
section_title: 6.6.2.2	Initial Registration & PDU Session Establishment
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