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vertical handoff 801.11a
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One of the popular systems is the integration of the IEEE 802.11 Wifi networkand cellular network like UMTS or global system for mobile (GSM). These systems coexist and many cellular devices support dual frequency interface for Wifi and cellular access,Wifi coves hotspot area and provides greater bandwidth but low mobility, whereas cellular network provides low bandwidth but high mobility.
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VHO between HSDPA and WLAN
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HSDPA and WiFi 802.11b. High speed downlink packet access (HSDPA) is a technology in mobile communication system issued by 3GPP version 5. It is a 3.5G technology. HSDPA has packet based services for data. WiFi or WiFi fidelity, a variant of ICT, works on WLAN for networks and devices. WiFi 802.11b is a technology that can support the mobility or displacement of users. To maintain the continuity of service required by the mobility of users in the telecommunication network, and therefore, a reliable handoff mechanism is needed. Handoff is an important aspect in cellular wireless systems to ensure that the current relationship will continue to exist, even if the user moves to a location, so there is no drop in the system. Regression doesn't just happen in the same system or technology, but it can also happen in different systems called vertical handoff.
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