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Sensors 2013, 13(8), 10219-10244;

On Maximizing the Lifetime of Wireless Sensor Networks by Optimally Assigning Energy Supplies

Centro Universitario de la Defensa, University of Vigo, Praza de España, Marín 36920, Spain
Departament of Information and Communication Technologies, Universidad Politécnica de Cartagena (UPCT), ETSIT, Campus Muralla del Mar 1, Cartagena 30202, Spain
Departamento de Enxeñaría Telemática, University of Vigo, Campus, Vigo 36310, Spain
Author to whom correspondence should be addressed.
Received: 27 June 2013 / Revised: 30 July 2013 / Accepted: 2 August 2013 / Published: 9 August 2013
(This article belongs to the Special Issue State-of-the-Art Sensors Technology in Spain 2013)
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The extension of the network lifetime of Wireless Sensor Networks (WSN) is an important issue that has not been appropriately solved yet. This paper addresses this concern and proposes some techniques to plan an arbitrary WSN. To this end, we suggest a hierarchical network architecture, similar to realistic scenarios, where nodes with renewable energy sources (denoted as primary nodes) carry out most message delivery tasks, and nodes equipped with conventional chemical batteries (denoted as secondary nodes) are those with less communication demands. The key design issue of this network architecture is the development of a new optimization framework to calculate the optimal assignment of renewable energy supplies (primary node assignment) to maximize network lifetime, obtaining the minimum number of energy supplies and their node assignment. We also conduct a second optimization step to additionally minimize the number of packet hops between the source and the sink. In this work, we present an algorithm that approaches the results of the optimization framework, but with much faster execution speed, which is a good alternative for large-scale WSN networks. Finally, the network model, the optimization process and the designed algorithm are further evaluated and validated by means of computer simulation under realistic conditions. The results obtained are discussed comparatively. View Full-Text
Keywords: wireless sensor networks; lifetime optimization; energy supply assignment wireless sensor networks; lifetime optimization; energy supply assignment
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).
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Asorey-Cacheda, R.; García-Sánchez, A.J.; García-Sánchez, F.; García-Haro, J.; González-Castano, F.J. On Maximizing the Lifetime of Wireless Sensor Networks by Optimally Assigning Energy Supplies. Sensors 2013, 13, 10219-10244.

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