基于效用最大化的无线可充电传感器网络有向充电调度方案

针对当前无线可充电传感器网络(WRSNs)一对一移动充电方式存在充电效率低、定向充电模型缺乏问题,该文提出了一种基于充电效用最大化(MUC)的一对多有向充电调度方案.方案首先筛选网络中充电增益最大的有向覆盖子集;然后根据有向覆盖子集确定充电锚点,并进而规划充电器的移动路径;最后在满足移动充电器能量和充电周期约束条件下优化移动充电器的充电时间.实验结果表明,该方案与平均能量充电(AEC)、固定能量充电(FEC)相比,充电效率分别提高了13.7%和32.7%;与最多节点覆盖(MNC)、最大平均增益覆盖(MAGC)子集筛选方案相比,充电效率分别提高了4.4%和35.9%;同时在网络饿死节点数目上与MNC, MAGC方案相比也显著降低.

Directional Charging Schedule Scheme Based on Charging Utility Maximization for Wireless Rechargeable Sensor Network

The one-to-one charging method for Wireless Rechargeable Sensor Networks (WRSNs) mobile chargers has some problems such as low charging efficiency and lack of directional charging model. To cope with the problems, a one-to-many directed charging scheduling scheme based on Maximizing Utility Charging (MUC) is proposed. In this scheme, the directed coverage subsets with the largest charging gain in the network is first searched; Then the charging anchor points are determined according to the directed coverage subset and the charger movement path is planned; Finally, the constraints of mobile charger energy and charging cycle are considered and the charging time is optimized. Experimental results show that in comparation with Average Energy Charge (AEC) and Fixed Energy Charge (FEC) charging time optimization schemes, the charging efficiency of this scheme is increased by 13.7% and 32.7% respectively. In comparation with Maximum Node Coverage (MNC) and Maximum Average Gain Coverage (MAGC) subset screening schemes, the charging efficiency is increased by 4.4% and 35.9% respectively. In addition, the number of starved nodes in the network is significantly reduced compared with the MNC, MAGC schemes.