This TS specifies the network selection, including authentication and access authorization using
authentication, authorization and accounting (AAA) procedures used for the interworking of the 3GPP system and
WLANs. In addition to these, the present document also specifies the tunnel management procedures used for
establishing an end-to-end tunnel from the WLAN UE to the 3GPP network via the Wu reference point.
This TS is applicable to the WLAN user equipment (UE) and the network. In this technical specification the network includes the WLAN and 3GPP network.
Tunnel management signalling is carried between WLAN-UE and WLAN by WLAN access technology specific
protocols, however this signalling is transparent to the WLAN.
Tunnel management procedures are defined to be independent of the underlying WLAN access technology and as such
can be reused independently of the underlying technology.
This TS specifies procedures within I-WLAN necessary in order for IMS emergency calls to be supported
when I-WLAN is used as the underlying access network. These involve both network selection as well as tunnel