The Internet of Things (IoT) comprises an increasing number of low-power and low-cost devices that autonomously interact with the surrounding environment. As a consequence of their popularity, future IoT deployments will be massive, which demands energy-efficient systems to extend their lifetime and improve the user experience. Radio frequency wireless energy transfer has the potential of powering massive IoT networks, thus eliminating the need for frequent battery replacement by using the so-called power beacons (PBs). In this paper, we provide a framework for minimizing the sum transmit power of the PBs using devices' positions information and their current battery state. Our strategy aims to reduce the PBs' power consumption and to mitigate the possible impact of the electromagnetic radiation on human health. We also present analytical insights for the case of very distant clusters and evaluate their applicability. Numerical results show that our proposed framework reduces the outage probability as the number of PBs and/or the energy demands increase.
翻译:物联网(IoT)由越来越多的与周围环境自主互动的低电和低成本装置组成,由于这些装置受到欢迎,未来的IoT部署规模将十分庞大,要求节能系统延长其使用寿命并改进用户经验。无线电频率无线能源传输有可能为大规模IoT网络提供动力,从而消除使用所谓的电灯更换电池的频繁需求。在本文中,我们提供了一个框架,以尽量减少利用设备位置信息及其当前电池状态传输PB的电量。我们的战略是减少PB的电能消耗,减轻电磁辐射对人类健康可能产生的影响。我们还就非常遥远的电离层的情况提出分析见解,并评估其适用性。数字结果显示,随着PB和/或能源需求增加,我们提议的框架降低了耗电的概率。