Lee Sol-Bee, Kwon Jung-Hyok, Kim Eui-Jik
School of Software, Hallym University, 1 Hallymdaehak-gil, Chuncheon 24252, Gangwon-do, Korea.
Sensors (Basel). 2021 Nov 16;21(22):7617. doi: 10.3390/s21227617.
This paper presents a residual energy estimation-based medium access control (REE-MAC) protocol for wireless powered sensor networks (WPSNs) composed of a central coordinator and multiple sensor devices. REE-MAC aims to reduce overhead due to control messages for scheduling the energy harvesting operation of sensor devices and provide fairness for data transmission opportunities to sensor devices. REE-MAC uses two types of superframes that operate simultaneously in different frequency bands: the wireless energy transfer (WET) superframe and wireless information transfer (WIT) superframe. At the beginning of each superframe, the coordinator estimates the change in the residual energy of individual sensor devices caused by their energy consumption and energy harvesting during the previous superframe. It then determines the devices' charging priorities, based on which it allocates dedicated power slots (DPSs) within the WET superframe. The simulation results demonstrated that REE-MAC exhibits superior performance for the harvested energy, average freezing time, and fairness to existing representative WPSN MAC protocols.
本文提出了一种基于剩余能量估计的介质访问控制（REE-MAC）协议，用于由一个中央协调器和多个传感器设备组成的无线供电传感器网络（WPSN）。REE-MAC旨在减少因调度传感器设备能量收集操作的控制消息而产生的开销，并为传感器设备的数据传输机会提供公平性。REE-MAC使用两种在不同频段同时运行的超帧：无线能量传输（WET）超帧和无线信息传输（WIT）超帧。在每个超帧开始时，协调器估计各个传感器设备在前一个超帧期间由于能量消耗和能量收集而导致的剩余能量变化。然后，它确定设备的充电优先级，并据此在WET超帧内分配专用功率时隙（DPS）。仿真结果表明，与现有的代表性WPSN MAC协议相比，REE-MAC在收集的能量、平均冻结时间和公平性方面表现出卓越的性能。
