ashu sabharwalrice university at-scale programmable wireless testbeds ashu sabharwal director, cmc...
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Ashu Sabharwal Rice University
At-scale Programmable Wireless Testbeds
Ashu Sabharwal
Director, CMCRice University
Ashu Sabharwal Rice University
At-scale Programmable Wireless Testbeds
Ashu Sabharwal, Ed Knightly, Behnaam Aazhang and Joe Cavallaro
CMC
Ashu Sabharwal Rice University
Broadband Wireless Testbeds
• Programmable– Clean-slate design
• At-speed– Data-rate which users care about (10-100 Mbps)
• At-scale – 1000s of Real users
Ashu Sabharwal Rice University
Broadband Wireless Testbeds
• Programmable– Clean-slate design– High-performance
• At-speed– Data-rate which users care about (10-100 Mbps)– Stay with the technology curve
• At-scale – 1000s of Real users– Deployment: capacity-coverage-cost tradeoffs
WARP
TFA-Rice
Ashu Sabharwal Rice University
Wireless Open-Access Research Platform
• Xilinx Virtex 2Pro• 4 Daughtercard slots (upto
4x4 MIMO)• Fully operational & all
code open-source at warp.rice.edu
Ashu Sabharwal Rice University
Wireless Open-Access Research Platform
• Performance• Flexibility• Deployability
• Xilinx Virtex 2Pro• 4 Daughtercard slots (upto
4x4 MIMO)• Fully operational & all
code open-source at warp.rice.edu
Ashu Sabharwal Rice University
WARP: Performance
• Current PHY (2x2 MIMO)– 30 Mbps in 12.5 MHz– 60 Mbps tested in lab
• With optimizations, capable of hitting 100+ Mbps
Ashu Sabharwal Rice University
WARP: Flexibility
• Spectrum usage with 4 radios– 160 MHz across 2.4GHz and 5 GHz – Upto 4x4 40 MHz MIMO (802.11n, WiMax)
• Many extensions– TI DSP: can implement a full cell phone– Video card: for raw video input (joint source-channel
coding)
Ashu Sabharwal Rice University
WARP: Deployability
• Implements PHY, MAC, routing on every node– Can implement real-time clean-slate full stacks– All layers use conventional tools
• 8”x8” deployable like small access points
NetworkStack
Devices
Ashu Sabharwal Rice University
TFA-Rice
• Houston Pecan Park• Low income community
(56% <$25K/year)• Empower via technology
– Education (36% graduation rate)
– Health (high chronic disease rates)
Ashu Sabharwal Rice University
TFA-Rice
• Scalability• Observable• “Reality”• Applications
• Houston Pecan Park• Low income community
(56% <$25K/year)• Empower via technology
– Education (36% graduation rate)
– Health (high chronic disease rates)
Ashu Sabharwal Rice University
TFA-Rice: Scalability
• Two-tier Architecture– Access-tier : Clients (home & mobiles) to mesh nodes– Backhaul-tier : Mesh nodes wirelessly hop to gateway
• Dramatically reduced deployment costs– Limited fiber & inexpensive nodes
Ashu Sabharwal Rice University
TFA-Rice: Scalability (Pilot Program)
• Operational since 2004– 2000+ users @ 1 Mb/s over 3 Km2
• Growing to 4x4 scale - 4000 users over 4 Km2
• City inviting CFP to cover 620 Miles2 of Houston• Projected Growth: 1500 companies, $1 Billion market by 2010
QuickTime™ and aTIFF (Uncompressed) decompressor
are needed to see this picture.
Ashu Sabharwal Rice University
TFA-Rice: Observable
• Mesh nodes – Single-channel– Multiple antenna types
• Deployment research – Node spacing, path length to gateways– Link versus network-wide behavior
Ashu Sabharwal Rice University
TFA-Rice: Reality Bite 1
• Research has to treat users like end-customers– Even if you made no promises– Police/Commuters are using TFA
• Key issue – Useful only if real users use it– Real users will use it only if the network is useful
(reliable)– Running experiments, reboots, unreliabilities not
tolerated even for free services
Reliability and Accessibility are critical
Ashu Sabharwal Rice University
TFA-Rice: Reality Bite 2
• Want a large user base ?– Devices have to be reliable, cheap like 802.11– Research devices can only be in small numbers
• Does not preclude innovation– Control and backhaul protocols– Applications - healthcare
Standard Access Protocol Key to Scale
Ashu Sabharwal Rice University
TFA-Rice: Reality Bite 3
• CAPEX ~$20K/Km2
• OPEX– ISP– Customer support– Maintain research devices– Deploy new protocols– Work with community
• Earthlink, Tropos handle such scale
OPEX >> CAPEX
Ashu Sabharwal Rice University
TFA-Rice: Applications
• Rice, Methodist Hospital & TFA Collaboration• Addressing Chronic Cardiovascular Disease
– CVD responsible for 40% of all dealths in Texas– Higher occurrence in low-income
Ashu Sabharwal Rice University
TFA-Rice: Applications
• Rice, Methodist Hospital & TFA Collaboration• Addressing Chronic Cardiovascular Disease
– CVD responsible for 40% of all dealths in Texas– Higher occurrence in low-income
• Dasco hypothesis: 1950’s medical literature for low-cost monitoring – Simple metrics + info-gap theory yield effective predictors
Ashu Sabharwal Rice University
TFA-Rice: Applications
• Inter-connecting low-cost sensors, “health-phone,” pervasive wireless, and medical practitioners
• Collection, dissemination, and analysis of health data• Analysis alerts patient and community health worker of
potential problems
Health-phoneBlue Box
Ashu Sabharwal Rice University
Near Future Plans
• Deploy WARP nodes with novel new protocols• Higher throughput backhaul• Target 3 Mbps/user
Ashu Sabharwal Rice University
Conclusions
• Research challenges abound– Design, deploy, measure, model, …– Transformational applications
Ashu Sabharwal Rice University
Conclusions
• Research challenges abound– Design, deploy, measure, model, …– Transformational applications
• What is our ultimate metric ?– CANNOT just be bits/sec
• Improving – Life expectancy– Education
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