Fourth generation (4G) Network integrates existing wireless technologies (GPRS/UMTS, WiMAX, WLAN, etc.) and offers access to services while on the move, at any place and any time. A multi-interface device can switch connection among available access points implementing different technologies. Integration of heterogeneous wireless networks can be performed at different levels (open coupling and tight coupling.). This paper presents a loose coupling approach to interconnect UMTS and WIMAX systems.
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