Characterizing Inter-contact Patterns in Delay ... - Jeremie Leguay
Log proximity (10 meters) every 2 minutes t contact time inter-contact time. A. B. Characterizing Inter-contact Patterns in. Delay Tolerant Networks. Vania Conan1 ...
Characterizing Inter-contact Patterns in Delay Tolerant Networks Vania Conan1, Jérémie Leguay1, Timur Friedman2
Context The scenario Mobile users carrying always-on devices Direct communication opportunities between people Interactions are driven by social factors
Main challenge •
Mobile users intermittently connected
Understanding contact patterns in DTNs is elemental to the design of effective routing or content distribution schemes.
Data sets iMote
MIT (Reality Mining experiment) • • •
97 phones over an academic year (2004-2005)
•
Proximity recorded using Bluetooth (every 5 minutes)
•
90 first days of data
•
Dartmouth
41 iMotes over 3 years at Infocom 2005 Bluetooth contact loggers that people carry in their pockets Log proximity (10 meters) every 2 minutes
•
Not a true DTN data set
•
One of the largest Wi-Fi data collection efforts
•
550 APs
Methodology •
Looking at pairwise contact and inter-contact times
•
Cramer-Smirnov-Von-Mises statistical hypothesis test that rejects the hypothesis with 99% of confidence
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