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A tracking system using location prediction and dynamic threshold for minimizing SMS delivery

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5 Author(s)
Lai, Yuan-Cheng ; Department of Information Management, National Taiwan University of Science and Technology, Taipei, Taiwan ; Lin, Jian-Wei ; Yeh, Yi-Hsuan ; Lai, Ching-Neng
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In this paper, a novel method called location-based delivery (LBD), which combines the short message service (SMS) and global position system (GPS), is proposed, and further, a realistic system for tracking a target's movement is developed. LBD reduces the number of short message transmissions while maintaining the location tracking accuracy within the acceptable range. The proposed approach, LBD, consists of three primary features: Short message format, location prediction, and dynamic threshold. The defined short message format is proprietary. Location prediction is performed by using the current location, moving speed, and bearing of the target to predict its next location. When the distance between the predicted location and the actual location exceeds a certain threshold, the target transmits a short message to the tracker to update its current location. The threshold is dynamically adjusted to maintain the location tracking accuracy and the number of short messages on the basisof the moving speed of the target. The experimental results show that LBD, indeed, outperforms other methods because it satisfactorily maintains the location tracking accuracy with relatively fewer messages.

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Communications and Networks, Journal of  (Volume:15 ,  Issue: 1 )