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In this paper, a TDMA based underwater acoustic channel access method (UA-MAC) is proposed mainly to improve channel utilization in dense mobile underwater wireless sensor networks (MUWSN). In UA-MAC, the time slot of each node accessing to the acoustic channel is assigned according to a preverified template, which aims to minimize amount of slots so as to decrease the end-to-end delay. In addition, a piggyback based protocol is implemented to synchronize and schedule the network. The simulation results show that UA-MAC is much superior to common TDMA in throughput, channel utilization, and end-to-end delay especially in dense scenario. Based on the low-power low-cost underwater acoustic nodes we developed, the experiments were carried out to validate the proposed UA-MAC. <\/jats:p>","DOI":"10.1155\/2014\/374028","type":"journal-article","created":{"date-parts":[[2014,2,19]],"date-time":"2014-02-19T22:07:52Z","timestamp":1392847672000},"page":"374028","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":15,"title":["UA-MAC: An Underwater Acoustic Channel Access Method for Dense Mobile Underwater Sensor Networks"],"prefix":"10.1177","volume":"10","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-2293-4384","authenticated-orcid":false,"given":"Chao","family":"Lv","sequence":"first","affiliation":[{"name":"Institute of Microelectronics, Chinese Academy of Sciences, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shuo","family":"Wang","sequence":"additional","affiliation":[{"name":"The State Key Laboratory of Management and Control for Complex Systems, Institute of Automation, Chinese Academy of Sciences, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Min","family":"Tan","sequence":"additional","affiliation":[{"name":"The State Key Laboratory of Management and Control for Complex Systems, Institute of Automation, Chinese Academy of Sciences, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lan","family":"Chen","sequence":"additional","affiliation":[{"name":"Institute of Microelectronics, Chinese Academy of Sciences, China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"179","published-online":{"date-parts":[[2014,2,19]]},"reference":[{"key":"B1-2014-374028","doi-asserted-by":"publisher","DOI":"10.1016\/j.adhoc.2005.01.004"},{"key":"B2-2014-374028","doi-asserted-by":"publisher","DOI":"10.1109\/TMC.2011.190"},{"key":"B3-2014-374028","first-page":"1","volume-title":"Proceedings of the 4th International Symposium on Modeling and Optimization in Mobile, Ad Hoc and Wireless Networks","author":"Makhija D."},{"key":"B4-2014-374028","doi-asserted-by":"publisher","DOI":"10.1109\/WCICA.2006.1713804"},{"key":"B5-2014-374028","doi-asserted-by":"publisher","DOI":"10.1109\/ROBIO.2009.4913010"},{"key":"B6-2014-374028","doi-asserted-by":"publisher","DOI":"10.1109\/OCEANS.2008.5151843"},{"key":"B7-2014-374028","doi-asserted-by":"publisher","DOI":"10.1109\/EMNETS.2005.1469110"},{"key":"B8-2014-374028","first-page":"12819","volume-title":"Proceedings of the 17th World Congress of The International Federation of Automatic Control","author":"Lu C."},{"key":"B9-2014-374028","first-page":"1","volume-title":"Proceedings of the IFIP Networking Conference","author":"Pu L."},{"key":"B10-2014-374028","doi-asserted-by":"publisher","DOI":"10.1109\/JOE.2007.899277"},{"key":"B11-2014-374028","doi-asserted-by":"publisher","DOI":"10.1109\/INFOCOM.2007.55"},{"key":"B12-2014-374028","first-page":"190","volume-title":"Proceedings of the 7th ACM International Symposium on Mobile Ad Hoc Networking and Computing (MOBIHOC '06)","author":"Rhee I."},{"key":"B13-2014-374028","doi-asserted-by":"publisher","DOI":"10.1109\/TMC.2011.28"},{"key":"B14-2014-374028","doi-asserted-by":"publisher","DOI":"10.1109\/TWC.2010.062910.100137"},{"key":"B15-2014-374028","first-page":"207","volume-title":"Proceedings of 15th International Symposium on Wireless Personal Multimedia Communications","author":"Hsu C. 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