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It is necessary to select an appropriate access network out of the several available as well as perform vertical handover, which can be considered to be one of the key features of IMT-Advanced. The authors now have a dual-mode Mobile Terminal (MT) which can connect to both Wireless LAN (WLAN) and cellular NWs, featuring a high transmission rate and wide coverage area, respectively. Before selecting and switching access NWs, it must detect the coverage areas of the access NWs that are candidates for connection. Since the MT is generally battery powered, it is a mandatory requirement to detect NWs without consuming too much power.
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