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Underwater acoustic networks: evaluation of the impact of media access control on latency, in a delay constrained network

This thesis presents an evaluation of the performance, in terms of throughput and latency, of two Media Access Control (MAC) mechanisms in Underwater Acoustic Networks (UANs), using a model designed in the COTS simulation tool OPNET 10.5. The carrier sense multiple access with collision avoidance is the predominant approach for implementing the MAC mechanism in UANs. However, the underwater acoustic environment is characterized by extreme propagation delays and limited bandwidth, which suggests that an Aloha-like scheme may merit consideration. The performance of these two schemes was compared with respect to two topologies: tree and grid. The results showed that an Aloha-like scheme that does not segment messages outperforms the contention-based scheme under all load conditions, in terms of both throughput and latency, for the two topologies. This thesis is the first to establish that Aloha-like MAC mechanisms can be more than a limited alternative for lightly loaded networks; more specifically, they can be the preferred choice for an environment with large propagation delays. / Lieutenant Commander, Portuguese Navy

Identiferoai:union.ndltd.org:nps.edu/oai:calhoun.nps.edu:10945/2304
Date03 1900
CreatorsCoelho, Jose Manuel dos Santos
ContributorsWen, Su, Xie, Geoffrey, Gibson, John, Naval Postgraduate School (U.S.), Department of Computer Science
PublisherMonterey, California. Naval Postgraduate School
Source SetsNaval Postgraduate School
Detected LanguageEnglish
TypeThesis
Formatxvi, 169 p. : ill. (some col.), application/pdf
RightsCopyright is reserved by the copyright owner

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