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IMC '05, 2005 Internet Measurement Conference — Abstract
Pp. 299–304 of the Proceedings
Eliminating Handoff Latencies in 802.11 WLANs Using Multiple Radios: Applications, Experience, and Evaluation
Vladimir Brik, University of Wisconsin, Madison; Arunesh Mishra, University of Maryland, College Park; Suman Banerjee, University of Wisconsin, Madison
Abstract
Deployment of Voice-over IP (VoIP) and other real-time streaming
applications has been somewhat limited in wireless LANs today, partially
because of the high handoff latencies experienced by mobile users.
Our goal in this work is to eliminate handoff latency by
exploiting the potential of multiple radios in WLAN devices.
Our proposed approach, called MultiScan, is
implemented entirely on the client-side, and, unlike prior work,
MultiScan requires neither changing the Access Points (APs), nor having knowledge of wireless network topology.
MultiScan nodes rely on using their (potentially idle) second
wireless interface to opportunistically scan and pre-associate with
alternate APs and eventually seamlessly handoff ongoing connections.
In this paper we describe our implementation of MultiScan,
present detailed evaluations of its effect on handoff
latency and evaluate performance gains for MultiScan-enhanced
wireless clients running Skype, a popular commercial VoIP
application.
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