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Issue No.10 - October (2009 vol.8)
pp: 1326-1338
Hsiao-Ju Kuo , MediaTek Inc., Taipei
Sheng-Po Kuo , Telcordia National Chiao Tung University, Taipei
Localization is a critical issue in wireless sensor networks. In most localization systems, beacons are being placed as references to determine the positions of objects or events appearing in the sensing field. The underlying assumption is that beacons are always reliable. In this work, we define a new Beacon Movement Detection (BMD) problem. Assuming that there are unnoticed changes of locations of some beacons in the system, this problem concerns how to automatically monitor such situations and identify such unreliable beacons based on the mutual observations among beacons only. Existence of such unreliable beacons may affect the localization accuracy. After identifying such beacons, we can remove them from the localization engine. Four BMD schemes are proposed to solve the BMD problem. Then, we evaluate how these solutions can improve the accuracy of localization systems in case there are unnoticed movements of some beacons. Simulation results show that our solutions can capture most of the unnoticed beacon movement events and thus can significantly alleviate the degradation of such events.
Context awareness, localization, location-based service, pervasive computing, positioning, wireless sensor network.
Hsiao-Ju Kuo, Sheng-Po Kuo, "The Beacon Movement Detection Problem in Wireless Sensor Networks for Localization Applications", IEEE Transactions on Mobile Computing, vol.8, no. 10, pp. 1326-1338, October 2009, doi:10.1109/TMC.2009.15
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