Mobility helps data delivery in disruption tolerant networks

Authors:
Kaoru Sezaki;Niwat Thepvilojanapong;Yoshito Tobe
Affiliations:
Center for Spatial Information Science, University of Tokyo, Tokyo, Japan;Department of Information and Communication Engineering, University of Tokyo, Tokyo, Japan;Department of Info. Systems and Multimedia Design, Tokyo Denki University, Chiyoda, Tokyo, Japan
Venue:
UCS'07 Proceedings of the 4th international conference on Ubiquitous computing systems
Year:
2007

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Abstract

Sensor networks using mobile robots have recently been proposed to deal with data communication in disruption tolerant networks (DTNs) where an instantaneous end-to-end path between a source and destination may not exist. In such network scenarios, a node should move to deliver data to the destination. In this paper, we study adaptive formations of mobile robots based on the knowledge of network topology held by each node. Different node formations are applied when nodes have neighboring, clustering, or perfect information of network. Node formations also depend on traffic patterns, e.g., single and multiples packets per event. We introduce a straight line formation called pipeline for delivering multiple packets continuously. The benefit of controlled mobility in DTNs is validated through the ns-2 simulation tool by comparing with the ideal cases.