Location-aware source routing protocol for underwater acoustic networks of AUVs

Authors:
Edward A. Carlson;Pierre-Philippe J. Beaujean;Edgar An
Affiliations:
Department of Ocean and Mechanical Engineering, Florida Atlantic University, Boca Raton, FL;Department of Ocean and Mechanical Engineering, Florida Atlantic University, Boca Raton, FL;Department of Ocean and Mechanical Engineering, Florida Atlantic University, Boca Raton, FL
Venue:
Journal of Electrical and Computer Engineering - Special issue on Underwater Communications and Networking
Year:
2012

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Abstract

Acoustic networks of autonomous underwater vehicles (AUVs) cannot typically rely on protocols intended for terrestrial radio networks. This work describes a new location-aware source routing (LASR) protocol shown to provide superior network performance over two commonly used network protocols--flooding and dynamic source routing (DSR)--in simulation studies of underwater acoustic networks of AUVs. LASR shares some features with DSR but also includes an improved link/route metric and a node tracking system. LASR also replaces DSR's shortest-path routing with the expected transmission count (ETX) metric. This allows LASR to make more informed routing decisions, which greatly increases performance compared to DSR. Provision for a node tracking system is another novel addition: using the time-division multiple access (TDMA) feature of the simulated acoustic modem, LASR includes a tracking system that predicts node locations, so that LASR can proactively respond to topology changes. LASR delivers 2-3 times as many messages as flooding in 72% of the simulated missions and delivers 2-4 times as many messages as DSR in 100% of the missions. In 67% of the simulated missions, LASR delivers messages requiring multiple hops to cross the network with 2-5 times greater reliability than flooding or DSR.