NDLI: Eliminating handoff latencies in 802.11 WLANs using multiple radios: applications, experience, and evaluation

Content Provider	ACM Digital Library
Author	Brik, Vladimir Mishra, Arunesh Banerjee, Suman
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.
Starting Page	27
Ending Page	27
Page Count	1
File Format	PDF
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2005-10-19
Access Restriction	Subscribed
Content Type	Text
Resource Type	Article

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Eliminating handoff latencies in 802.11 WLANs using multiple radios: applications, experience, and evaluation