tailieunhanh - Báo cáo hóa học: " Research Article Distributed and Collaborative Node Mobility Management for Dynamic Coverage Improvement in Hybrid Sensor Networks"

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 Distributed and Collaborative Node Mobility Management for Dynamic Coverage Improvement in Hybrid Sensor Networks | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2011 Article ID 724136 17 pages doi 2011 724136 Research Article Distributed and Collaborative Node Mobility Management for Dynamic Coverage Improvement in Hybrid Sensor Networks Thakshila Wimalajeewa1 and Sudharman K. Jayaweera2 1 Department of Electrical Engineering and Computer Science Syracuse University Syracuse NY 13244 USA 2 Department of Electrical and Computer Engineering University of New Mexico Albuquerque NM 87131 USA Correspondence should be addressed to Thakshila Wimalajeewa twwewelw@ Received 25 April 2010 Revised 15 January 2011 Accepted 4 February 2011 Academic Editor Amiya Nayak Copyright 2011 T. Wimalajeewa and S. K. Jayaweera. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. With recent advances in deploying sensor nodes mounted on mobile platforms node mobility is becoming an attractive alternative to improve network coverage dynamically in sensor networks. However due to energy constraints it may not be cost effective to deploy a large number of mobile nodes for continuous movements. It might be more desirable to allow only a certain number of nodes to be mobile depending on the affordable cost and desired performance levels. This paper proposes an efficient distributed mobility protocol for mobile node navigation in a hybrid sensor network consisting of both static and mobile nodes to provide efficient time-varying coverage after the initial deployment. In the proposed scheme mobile nodes collaborate with neighboring static nodes to find their candidate locations to move at each movement step in order to maximize the coverage time of the area not covered by static nodes. We also develop an efficient sequential algorithm to find the exposure in a hybrid network which reflects