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UMTS-WLAN heterogeneous mobile networks allow a single mobile user with different radio technologies to access different mobile networks, but how to secure such inter-working networks and provide a seamless service is a new challenge. Even if EAP-AKA protocol provides authentication services in UMTS-WLAN inter-working networks, a fast re-authentication of EAP-AKA protocol still cannot overcome high re-authentication delays and delay-sensitive applications. Because a mobile user is authenticated by a remote RADIUS or a HLR/HSS both resided in 3G-UMTS home networks whatever a full authentication or a fast re-authentication is occurred.
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