The proliferation of wireless local area networks (WLANs) offering high data rate in hot spot area have spurred the demand for possible WLANs and third-generation (3G) cellular network integration solutions as the initiative step towards 4G systems. This paper provides a novel architecture for seamless location-aware integration of WLANs into 3G cellular networks and also an analysis for the efficient handover techniques. We introduce location as a key context in secure roaming mechanism for context-aware interworking in 4G systems. The fast secure roaming with location-aware authentication is implemented at an entity called location-aware service (LAS) broker that utilizes the concepts of direction of user and pre-warming zone. The location-ware interworking architecture supports seamless roaming services among heterogeneous wireless networks including WLANs, wireless metropolitan area networks (WMANs), and 3G cellular networks. This paper also includes a description of procedures needed to implement efficient mobility and location management. We show how the LAS broker with pre-warming and context transfer can obtain significant lower latency in the vertical handover.
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3GPP TR 22.934 v6.2.0, 'Feasibility study on 3GPP system to WLAN interworking (Release 6),' Sept. 2002
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Kim, Gwan-Yeon ; Hwang, Zi-On ; Kim, Yong ; Uhm, Yoon-Sik ; Park, Se-Hyun 2007. "A Study of Pervasive Roaming Services with Security Management Framework" 情報保護學會論文誌 = Journal of the Korea Institute of Information Security and Cryptology, 17(4): 115~129