Residual Energy Estimation-Based MAC Protocol for Wireless Powered Sensor Networks.

Sol-Bee Lee,Eui-Jik Kim,Jung-Hyok Kwon

doi:10.3390/s21227617

Sol-Bee Lee, Eui-Jik Kim + Show 1 more

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https://doi.org/10.3390/s21227617

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Abstract

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.

Highlights

IntroductionAt 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
This paper proposes a residual energy estimation-based medium access control (MAC) (REE-MAC) protocol, with two advantages for wireless powered sensor networks (WPSNs) composed of a central coordinator and multiple sensor devices
residual energy estimation-based medium access control (REE-MAC) exhibits a higher average harvested energy compared with both FF-WPT and HE-MAC

Summary

Introduction

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 determines the devices’ charging priorities, based on which it allocates dedicated power slots (DPSs) within the WET superframe. The power station and fusion center may be included in one device or separated into different devices Such WPSNs are expected to have a potentially infinite network life, they cannot always prevent short-term disconnections due to temporary energy shortages of some sensor devices. Such short-term disconnections cause an imbalance in transmission opportunities between sensor devices, resulting in an unfairness problem for WPSNs [13,14,15,16].

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