Dynamic coverage in ad-hoc sensor networks

  • Authors:
  • Hai Huang;Andréa W. Richa;Michael Segal

  • Affiliations:
  • Department of Computer Science and Engineering, Arizona State University, Tempe, AZ;Department of Computer Science and Engineering, Arizona State University, Tempe, AZ;Communication Systems Engineering Department, Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel

  • Venue:
  • Mobile Networks and Applications
  • Year:
  • 2005

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Abstract

Ad-hoc networks of sensor nodes are in general semi-permanentlydeployed. However, the topology of such networks continuouslychanges over time, due to the power of some sensors wearing out, tonew sensors being inserted into the network, or even due todesigners moving sensors around during a network re-design phase(for example, in response to a change in the requirements of thenetwork). In this paper, we address the problem of how todynamically maintain two important measures on the quality of thecoverage of a sensor network: the best-case coverage and worst-casecoverage distances. We assume that the ratio between upper andlower transmission power of sensors is bounded by a polynomial ofn, where n is the number of sensors, and that themotion of mobile sensors can be described as a low-degreepolynomial function of time. We maintain a (1 +Ã)-approximation on the best-case coverage distance and a(ã2 + Ã)-approximation on the worst-case coveragedistance of the network, for any fixed à 0. Ouralgorithms have amortized or worst-case poly-logarithmic updatecosts. We are able to efficiently maintain the connectivity of theregions on the plane with respect to the sensor network, byextending the concatenable queue data structure to also serve as apriority queue. In addition, we present an algorithm that finds theshortest maximum support path in time O(n log n).