tailieunhanh - Báo cáo hóa học: " Research Article Extension of Pairwise Broadcast Clock Synchronization for Multicluster 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 Extension of Pairwise Broadcast Clock Synchronization for Multicluster Sensor Networks | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2008 Article ID 286168 10 pages doi 2008 286168 Research Article Extension of Pairwise Broadcast Clock Synchronization for Multicluster Sensor Networks Kyoung-Lae Noh 1 Yik-Chung Wu 2 Khalid Qaraqe 3 and Bruce W. Suter4 1 Digital Solution Center Corporate Technology Operations Samsung Electronics Co. Ltd. South Korea 2 Department of Electrical and Electronic Engineering The University of Hong Kong Hong Kong 3 Texas A M University at Qatar P. O. Box 23874 Doha Qatar 4 Information Directorate Air Force Research Laboratory RITC Rome NY 13441 USA Correspondence should be addressed to Yik-Chung Wu ycwu@ Received 26 April 2007 Revised 28 September 2007 Accepted 15 November 2007 Recommended by Paul Cotae Time synchronization is crucial for wireless sensor networks WSNs in performing a number of fundamental operations such as data coordination power management security and localization. The Pairwise Broadcast Synchronization PBS protocol was recently proposed to minimize the number of timing messages required for global network synchronization which enables the design of highly energy-efficient WSNs. However PBS requires all nodes in the network to lie within the communication ranges of two leader nodes a condition which might not be available in some applications. This paper proposes an extension of PBS to the more general class of sensor networks. Based on the hierarchical structure of the network an energy-efficient pair selection algorithm is proposed to select the best pairwise synchronization sequence to reduce the overall energy consumption. It is shown that in a multicluster networking environment PBS requires a far less number of timing messages than other well-known synchronization protocols and incurs no loss in synchronization accuracy. Moreover the proposed scheme presents significant energy savings for densely deployed WSNs. Copyright 2008 Kyoung-Lae Noh et

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