TAILIEUCHUNG - Báo cáo hóa học: " Research Article Data Dissemination in Wireless Sensor Networks with Network Coding"

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 Data Dissemination in Wireless Sensor Networks with Network Coding | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2010 Article ID 465915 14 pages doi 2010 465915 Research Article Data Dissemination in Wireless Sensor Networks with Network Coding XiuminWang 1 2 Jianping Wang 2 and Yinlong Xu1 1 School of Computer Science and Technology University of Science and Technology of China Hefei Anhui 230027 China 2 Department of Computer Science City University of Hong Kong Kowloon Hong Kong Correspondence should be addressed to Jianping Wang jianwang@ Received 28 September 2009 Revised 5 March 2010 Accepted 25 April 2010 Academic Editor Christina Fragouli Copyright 2010 Xiumin Wang et al. 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. In wireless sensor networks WSNs it is often necessary to update the software running on sensors which requires reliable dissemination of large data objects to each sensor with energy efficiency. During data dissemination due to sleep scheduling designed for energy efficiency some sensors may not receive some packets at some time slots. In the meantime due to the unreliability of wireless communication a sensor may not successfully receive a packet even when it is in the active mode. Thus retransmission of such packets to those sensors is necessary which consumes more energy and increases the delay of data dissemination cycle. In this paper we propose a network coding-based approach in data dissemination such that data dissemination can be accomplished at the earliest time. Thus less energy is consumed and the delay can be decreased. The impact of packet loss probability and the sleep probability of sensors on the network coding gain is analyzed. A threshold is also given to decide whether the current sleep scheduling is effective on energy saving in data dissemination process or

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