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DAIR: Dense Array of Inexpensive Radios
Managing Enterprise Wireless Networks Using Desktop Infrastructure
Victor Bahl†, Jitendra Padhye†, Lenin Ravnindranath†, Manpreet Singh‡,
Alec Wolman†, Brian Zill†
† Microsoft Research ‡ Cornell University
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Observations
• Outfitting a desktop PC with 802.11 wireless is becoming very inexpensive– Wireless USB dongles are cheap
– PC motherboards are starting toappear with 802.11 radios built-in
• Desktop PC’s with good wired connectivity are ubiquitous in enterprises
$6.99!
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Key Insight
• Combine to provide a dense deployment of wireless “sensors”
• We can use this platform to realize the full potential of wireless networks– Enterprise wireless management tools– Enable new services where wireless is a key
component
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The DAIR Platform
Wireless management tools
– Improve security
– Reduce IT ops costs
– Increase “quality of service”
New applications and services
– Location services
– Seamless roaming
– Alternative data distribution channel
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Outline
• Motivation
• DAIR architecture
• Management apps (& Rogue networks)
• Related work
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Enterprise WLAN Management
• Corporations spend a lot on WLAN infrastructure– Worldwide enterprise WLAN business expected to
grow from $1.1 billion this year to $3.5 billion in 2009– MS IT dept. – 72% of costs are people
• Security and reliability are major concerns– Wireless networks are becoming a target for hackers
– Reliability: • MS IT receives ~500 WLAN helpdesk requests per month• No easy way to measure cost of reliability problems
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Advantages of the DAIR Approach
– High density• Wireless propagation is highly variable in enterprise
environments (many obstructions)• Lots of channels to cover: 11 for 802.11b/g, 13 for 802.11a • Improves fidelity of many management tasks• Enables accurate location (useful as a diagnosis tool)