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Open AccessArticle

Energy-Efficient Cluster Management Using a Mobile Charger for Solar-Powered Wireless Sensor Networks

1
Department of Software Convergence, Soongsil University, Seoul 06978, Korea
2
Department of Electronic Engineering, Soongsil University, Seoul 06978, Korea
3
Department of Electrical and Computer Engineering, University of Wisconsin, Madison, WI 53706, USA
4
Department of Smart Systems Software, Soongsil University, Seoul 06978, Korea
*
Author to whom correspondence should be addressed.
Sensors 2020, 20(13), 3668; https://doi.org/10.3390/s20133668
Received: 15 May 2020 / Revised: 23 June 2020 / Accepted: 28 June 2020 / Published: 30 June 2020
(This article belongs to the Special Issue Low-Power Sensors and Systems for IoT)
In solar-powered wireless sensor networks (SP-WSNs), sensor nodes can continuously harvest energy to relieve the energy constraint problem in battery-powered WSNs. With the advent of wireless power transmission (WPT) technology, the nodes can be charged remotely if the energy harvested is insufficient. However, even in SP-WSNs with WPT, an energy imbalance problem is observed, in which the energy consumption of the nodes around a sink node increases abnormally if the sink node is stationary. To solve this problem, recent studies have been conducted using a mobile sink node instead of a stationary one. Generally, a clustering scheme is used for the efficient utilization of a mobile sink. However, even in the case of mobile sinks, it is still necessary to minimize the energy burden of the cluster heads and their surrounding nodes. In this study, we propose a scheme that mitigates the energy imbalance problem of SP-WSNs by using a WPT-capable mobile sink and an efficient clustering scheme. In the proposed scheme, the energy imbalance is minimized by electing the cluster heads effectively after considering the energy state of the nodes, and by enabling the sink node to charge the energy of the cluster heads while collecting data from them. Consequently, this scheme allows the sink node to collect more data with fewer blackouts of the sensor nodes. View Full-Text
Keywords: wireless sensor network; mobile sink; wireless power transmission; clustering wireless sensor network; mobile sink; wireless power transmission; clustering
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Son, Y.; Kang, M.; Kim, Y.; Yoon, I.; Noh, D.K. Energy-Efficient Cluster Management Using a Mobile Charger for Solar-Powered Wireless Sensor Networks. Sensors 2020, 20, 3668.

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