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Table of Contents
The WiNGS laboratory hosts an outdoor, vehicular, wireless testbed with support for various wide-area experimentation efforts, called MadBed.
Currently, MadBed consists of two wireless nodes mounted on specific city-buses operated by the Madison Metro Transit System.
Testbed Pictures
People
External collaborators
Sprint Laboratories
MadCity Broadband
How to access
The testbed nodes are remotely accessible and programmable. Each node consists of a Intel Core-2 Duo 2.0 GHz laptop, with WiFi interfaces, a 3G EVDO interface, and a Mobile Access Router (MAR) for providing Internet access to the bus passengers. We also have a remote bus tracking interface that allows us to locate the position of the buses in real-time.
Access to this testbed is currently limited to UW-Madison faculty and students. Please email Prof. Suman Banerjee for access and account information.
Papers
- A City-Wide Vehicular Infrastructure for Wide-Area Wireless Experimentation. Justin Ormont, Jordan Walker, Suman Banerjee, Sridhar Machiraju, Mukund Seshadri, Ashwin Sridharan. WinTECH Workshop (co-located with ACM MobiCom), Burlingame, CA, September 2008. pdf
- A Measurement Study of a Commercial-grade Urban WiFi Mesh. Vladimir Brik, Shravan Rayanchu, Sayandeep Sen, Vivek Shrivastava, Suman Banerjee. Internet Measurement Conference, Greece, October 2008. pdf
Phone Testbed
Power Usage
| GPS Till 1st Fix | GPS Continuous Usage | WiFi (tx) | WiFi (rx) | Accelerometer | EVDO (tx) | EVDO (rx) | Compression | Decryption | File Read | File Write | RIL | Bluetooth |
| x [mW-sec] | x [mW] | x [mW-sec/byte] | x [mW-sec/byte] | x [mW] | x [mW-sec/byte] | x [mW-sec/byte] | x [mW-sec/byte] | x [mW-sec/byte] | x [mW-sec/byte] | x [mW-sec/byte] | x [mW] | x [mW?] |
ToDo List
| Date | ToDo | Status |
| 09-24-08 | Program ability to control plugged-in status. | Not started |
| 09-24-08 | Combine data elements for power graphs from different db records. | Started |
| 09-24-08 | Plot power graphs. | Not started |
Status Updates
08-18-08
- Write Flush test ran, but unverified
- Running GPS test tonight still
- Software platform
- Added extension which can simulate writing log entries
- For testing Write Flush; W.F. needed log entries to write
- Allows us to turn off all other extensions
- Spent alot of time restructuring for easy scripting
- XML config files
- Purpose is towards management research
- Scripts what the experiment will do
- Downloads XML config from https server
- Phone rejects CS's TLS cert, coded a white list for certs
- Phone ID's itself, can be given a personal XML config
- Very easy format (see below)
- Improved stability & error handling
