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Issue No.02 - Feb. (2013 vol.24)
pp: 301-311
Benyuan Liu , University of Massachusetts Lowell, Lowell
Olivier Dousse , Nokia Research Center, Lausanne
Philippe Nain , INRIA Sophia Antipolis, Sophia Antipolis
Don Towsley , University of Massachusetts, Amherst
ABSTRACT
We study the dynamic aspects of the coverage of a mobile sensor network resulting from continuous movement of sensors. As sensors move around, initially uncovered locations may be covered at a later time, and intruders that might never be detected in a stationary sensor network can now be detected by moving sensors. However, this improvement in coverage is achieved at the cost that a location is covered only part of the time, alternating between covered and not covered. We characterize area coverage at specific time instants and during time intervals, as well as the time durations that a location is covered and uncovered. We further consider the time it takes to detect a randomly located intruder and prove that the detection time is exponentially distributed with parameter 2\lambda r \bar{v}_s where \lambda represents the sensor density, r represents the sensor's sensing range, and \bar{v}_s denotes the average sensor speed. For mobile intruders, we take a game theoretic approach and derive optimal mobility strategies for both sensors and intruders. We prove that the optimal sensor strategy is to choose their directions uniformly at random between [0, 2\pi ). The optimal intruder strategy is to remain stationary. This solution represents a mixed strategy which is a Nash equilibrium of the zero-sum game between mobile sensors and intruders.
INDEX TERMS
Robot sensing systems, Mobile communication, Mobile computing, Games, Intrusion detection, Electronic mail, mobility, Wireless sensor networks, coverage, detection time
CITATION
Benyuan Liu, Olivier Dousse, Philippe Nain, Don Towsley, "Dynamic Coverage of Mobile Sensor Networks", IEEE Transactions on Parallel & Distributed Systems, vol.24, no. 2, pp. 301-311, Feb. 2013, doi:10.1109/TPDS.2012.141
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