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The Optimization Based Dynamic and Cyclic Working Strategies for Rechargeable Wireless Sensor Networks with Multiple Base Stations and Wireless Energy Transfer Devices

by Xu Ding, Jianghong Han *,† and Lei Shi
School of Computer and Information, Hefei University of Technology, No.193 Tunxi Road, Hefei 230009, China
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Academic Editors: Luciano Lavagno and Mihai T. Lazarescu
Sensors 2015, 15(3), 6270-6305; https://doi.org/10.3390/s150306270
Received: 27 October 2014 / Revised: 5 March 2015 / Accepted: 6 March 2015 / Published: 16 March 2015
(This article belongs to the Special Issue Wireless Sensor Networks and the Internet of Things)
In this paper, the optimal working schemes for wireless sensor networks with multiple base stations and wireless energy transfer devices are proposed. The wireless energy transfer devices also work as data gatherers while charging sensor nodes. The wireless sensor network is firstly divided into sub networks according to the concept of Voronoi diagram. Then, the entire energy replenishing procedure is split into the pre-normal and normal energy replenishing stages. With the objective of maximizing the sojourn time ratio of the wireless energy transfer device, a continuous time optimization problem for the normal energy replenishing cycle is formed according to constraints with which sensor nodes and wireless energy transfer devices should comply. Later on, the continuous time optimization problem is reshaped into a discrete multi-phased optimization problem, which yields the identical optimality. After linearizing it, we obtain a linear programming problem that can be solved efficiently. The working strategies of both sensor nodes and wireless energy transfer devices in the pre-normal replenishing stage are also discussed in this paper. The intensive simulations exhibit the dynamic and cyclic working schemes for the entire energy replenishing procedure. Additionally, a way of eliminating “bottleneck” sensor nodes is also developed in this paper. View Full-Text
Keywords: wireless sensor networks; wireless energy transfer; dynamic and cyclic working schemes; Voronoi diagram; energy replenishing procedure; optimization problem wireless sensor networks; wireless energy transfer; dynamic and cyclic working schemes; Voronoi diagram; energy replenishing procedure; optimization problem
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Ding, X.; Han, J.; Shi, L. The Optimization Based Dynamic and Cyclic Working Strategies for Rechargeable Wireless Sensor Networks with Multiple Base Stations and Wireless Energy Transfer Devices. Sensors 2015, 15, 6270-6305.

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