Section: 4.12b.3 Deregistration procedure
Content: The Deregistration procedure for devices (N5CW devices) that do not support 5G NAS signalling over WLAN access shall be supported as specified in clause 4.12a.3 for the trusted non-3GPP access with the following modifications: - The TNAP is substituted by a trusted WLAN access point (TWAP). - The TNGF is substituted by the Trusted WLAN Interworking Function (TWIF). - The TWIF sends and receives NAS deregistration request/accept messages on behalf of N5CW device. - For both UE/Network-initiated deregistration procedures, the TWIF may initiate the release of Yt' connection between the N5CW device and TWIF. - UE-initiated deregistration procedure can be initiated by the TWIF, when it has lost connectivity to the N5CW device.