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Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article An Adaptive Time-Spread Multiple-Access Policy for Wireless Sensor Networks | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2007 Article ID 64238 8 pages doi 10.1155 2007 64238 Research Article An Adaptive Time-Spread Multiple-Access Policy for Wireless Sensor Networks Konstantinos Oikonomou1 and Ioannis Stavrakakis2 1 Department of Informatics Ionian University Tsirigoti Square 7 49100 Corfu Greece 2 Department of Informatics Telecommunications University of Athens Panepistimiopolis Ilissia 15784 Athens Greece Received 27 October 2006 Accepted 13 March 2007 Recommended by Stavros Toumpis Sensor networks require a simple and efficient medium access control policy achieving high system throughput with no or limited control overhead in order to increase the network lifetime by minimizing the energy consumed during transmission attempts. Time-spread multiple-access TSMA policies that have been proposed for ad hoc network environments can also be employed in sensor networks since no control overhead is introduced. However they do not take advantage of any cross-layer information in order to exploit the idiosyncrasies of the particular sensor network environment such as the presence of typically static nodes and a common destination for the forwarded data. An adaptive probabilistic TSMA-based policy that is proposed and analyzed in this paper exploits these idiosyncrasies and achieves higher system throughput than the existing TSMA-based policies without any need for extra control overhead. As it is analytically shown in this paper the proposed policy always outperforms the existing TSMA-based policies if certain parameter values are properly set the analysis also provides for these proper values. It is also shown that the proposed policy is characterized by a certain convergence period and that high system throughput is achieved for long convergence periods. The claims and expectations of the provided analysis are supported by simulation results presented in this paper. Copyright 2007 K. .
