Abstract
To guarantee the continuous coverage of the rechargeable sensors, Wireless Rechargeable Sensor Networks (WRSNs) has emerged with the advantages of high charging efficiency and reliable charging timeliness. Charging planning is an important problem in theoretical research and practical applications, and it faces more difficulties and challenges for multiple mobile chargers. In this paper, we introduce a charging planning problem for multiple chargers, namely Charging Energy Efficiency Maximization problem for Multi-Chargers in WRSNs (CEEM-MC Problem), and prove its NP-hardness. The problem aims to maximize the charging energy efficiency of the charging process by assigning the charging amount and planning the charging path. To balance the charging consumption among multiple chargers, we propose two algorithms which are different on the charging path planning, Ring-Wandering Algorithm and Eight-Wandering Algorithm. To evaluate the performance on energy efficiency, we perform a series of simulations and the results verify the effectiveness of the proposed algorithms.
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