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Vol. 14-2, Special Issue, March 2012, pp.242-253

 

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A Column Generation based Heuristic to extend Lifetime in Wireless Sensor Network

 

Karine DESCHINKEL

Department of Computer Science, University of Franche Comté

Tel.:+33-84.58.77.84

E-mail: Karine.Deschinkel@univ-fcomte.fr

 

 

Received: 7 November 2011   /Accepted: 20 December 2011   /Published: 12 March 2012

Digital Sensors and Sensor Sysstems

 

Abstract: Lifetime Optimization has received a lot of interest in wireless sensor networks. In our study we propose an energy-aware centralized method by organizing the nodes in non-disjoint cover sets where each cover set is capable of monitoring all the targets of the region of interest and by activate these cover sets successively. We first model the problem with a linear programming (LP) formulation for non-disjoint cover sets where the objective is to maximize the total work time of all cover sets, with respect the sensor’s battery lifetime. As the number of cover sets may be huge, exponential to the number of sensors and targets, we develop a resolution method based on a column generation (CG) process. This method requires the resolution of an auxiliary problem formulated as an integer programming (IP) problem. We propose a heuristic for addressing the auxiliary problem which produces very good solutions in lower computational times compared to an exact resolution as shown in the simulation results.

 

Keywords: Target coverage, Wireless sensor networks, Centralized method, Column generation

 

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