1. ECWAY TECHNOLOGIES
IEEE PROJECTS & SOFTWARE DEVELOPMENTS
OUR OFFICES @ CHENNAI / TRICHY / KARUR / ERODE / MADURAI / SALEM / COIMBATORE
CELL: +91 98949 17187, +91 875487 2111 / 3111 / 4111 / 5111 / 6111
VISIT: www.ecwayprojects.com MAIL TO: ecwaytechnologies@gmail.com
DYNAMIC COVERAGE OF MOBILE SENSOR NETWORKS
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 2λrvs where λ represents the sensor
density, r represents the sensor's sensing range, and vs 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, 2π). 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.