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unmediated

 

November 17, 2006

Network World explores how researchers are working to create disruption-tolerant networks (DTNs): mobile networks that can sustain communications even in the face of broken links and long delays. Flush with $8.7 million from the defense department, researchers earlier this year created a 20 node DTN where each link was available just 20% of the time, yet 100% of all packets were delivered successfully.

The piece also points to a DTN dubbed DieselNet at the University of Massachusetts Amherst. To date, 40 Busses are outfitted with off-the-shelf single-board computers, GPS receivers and radios. What they do then is rather unique:
"As two buses near each other, their DTN nodes query each other to find out what other nodes each sees most frequently. If one of those other nodes is related to the final network destination of a message, that message is handed off to the passing node in the seconds they’re close enough together for the Wi-Fi connection. At some point, the message is handed to a node attached to the wired Internet."
"This is harder than normal routing," says UMass researcher Brian Levine. "You can’t query the net to determine what paths are available. Because there are none."

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