PMAC: a real-world case study of underwater MAC

Authors:
Son N. Le;Yibo Zhu;Zheng Peng;Jun-Hong Cui;Zaihan Jiang
Affiliations:
University of Connecticut, Storrs, CT and Naval Research Laboratory, Washington, DC;University of Connecticut, Storrs, CT and Naval Research Laboratory, Washington, DC;University of Connecticut, Storrs, CT and Naval Research Laboratory, Washington, DC;University of Connecticut, Storrs, CT and Naval Research Laboratory, Washington, DC;University of Connecticut, Storrs, CT and Naval Research Laboratory, Washington, DC
Venue:
Proceedings of the Eighth ACM International Conference on Underwater Networks and Systems
Year:
2013

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Abstract

In this paper we document the design, implementation and testing of a scheduling-based MAC protocol, called PMAC, for a 2012's sea trial, and experience gained from this process. In this experiment, the topology was a straight line, and PMAC is specifically design to take advantage of it: network nodes take turn to send and those that are three hops apart are allowed to do so simultaneously. The result shows that although PMAC's performance is much better compared to other protocols in the same experiment, there is room for improvement by selecting an appropriate packet size and scheduling scheme. Besides that, the result reveals an important factor which we will show has significant impact on protocol design, yet is usually ignored in theoretical work: modem processing delay. The modem processing delay is in fact not negligible, and increasing with packet size. The paper also presents important lessons from this field test which are useful for similar future efforts.