Networked and Embedded Systems Laboratory

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A major requirement for the mobile Internet is the
wireless network access for handheld personal devices. As an
alternative to the expensive 3G networks, which share 2 Mbps in
several square kilometers, the use of short-range wireless
technologies like Bluetooth (sharing 1 Mbps among just 7 users),
has been proposed. This is much more economical as it works in
the unlicensed band and leverages the existing wired broadband
infrastructure. In such a Bluetooth network, however, the
mobiles will move out from the range of one access point into that
of another more frequently, requiring seamless handoff. We
discuss a new algorithm to support fast handoff at the wireless
layer. Our method exploits the continuity of the user’s path and
existing connection information at the older access point to
reduce the handoff delay. It inter-works with IP micromobility
protocols, such as Cellular IP, for managing other mobility
related issues at layer 3. Simulations reveal that our proposed
method reduces the handoff delay by more than an order of
magnitude and significantly enhances the bandwidth utilization.

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