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Sensors 2016, 16(2), 171; doi:10.3390/s16020171

The Study of Cross-layer Optimization for Wireless Rechargeable Sensor Networks Implemented in Coal Mines

1
,
2,†,* , 2,†
and
1,†
1
Institute of Industry and Equipment Technology, Hefei University of Technology, Hefei 230009, China
2
School of Computer and Information, Hefei University of Technology, Hefei 230009, China
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Academic Editor: Yu Wang
Received: 28 November 2015 / Revised: 17 January 2016 / Accepted: 22 January 2016 / Published: 28 January 2016
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Abstract

Wireless sensor networks deployed in coal mines could help companies provide workers working in coal mines with more qualified working conditions. With the underground information collected by sensor nodes at hand, the underground working conditions could be evaluated more precisely. However, sensor nodes may tend to malfunction due to their limited energy supply. In this paper, we study the cross-layer optimization problem for wireless rechargeable sensor networks implemented in coal mines, of which the energy could be replenished through the newly-brewed wireless energy transfer technique. The main results of this article are two-fold: firstly, we obtain the optimal relay nodes’ placement according to the minimum overall energy consumption criterion through the Lagrange dual problem and KKT conditions; secondly, the optimal strategies for recharging locomotives and wireless sensor networks are acquired by solving a cross-layer optimization problem. The cyclic nature of these strategies is also manifested through simulations in this paper. View Full-Text
Keywords: coal mines; wireless rechargeable sensor networks; wireless energy transfer; Lagrange dual problem; KKT conditions; cross-layer optimization coal mines; wireless rechargeable sensor networks; wireless energy transfer; Lagrange dual problem; KKT conditions; cross-layer optimization
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Ding, X.; Shi, L.; Han, J.; Lu, J. The Study of Cross-layer Optimization for Wireless Rechargeable Sensor Networks Implemented in Coal Mines. Sensors 2016, 16, 171.

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