Most nodes of Mine Internet of Things (Mine IoT) are powered by batteries, and wireless charging using mobile chargers (MCs) is an effective way to make nodes work sustainably. A novel hybrid charging method combining the controlled and opportunistic MCs (C&O charging) is proposed in this study. Workers (such as the repairmen and gas inspectors) carrying portable chargers are proposed to be opportunistic MCs to provide an incidental charging service for the surrounding rechargeable Mine IoT nodes while doing its own work to reduce the payload of controlled MCs. The hybrid charging model based on the incidental charging ability of the opportunistic MC is constructed and the scheduling strategy of the controlled MC and the queueing management scheme of the charging request are also proposed. The simulation results indicate that the power demands of the majority of the nodes in the maintenance areas can be met or partially met by opportunistic MCs and the charging time of C&O charging is greatly decreased compared to that of only using controlled MCs.

中文翻译：

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C＆O充电：矿用物联网的混合无线充电方法

矿山物联网（Mine IoT）的大多数节点都由电池供电，使用移动充电器（MC）进行无线充电是使节点可持续工作的有效方法。这项研究提出了一种新颖的混合充电方法，结合了受控和机会MC（C＆O充电）。建议携带便携式充电器的工人（例如修理工和气体检查员）是机会主义的MC，以为周围的可充电矿IoT节点提供附带的充电服务，同时要尽其所能来减少受控MC的负载。建立了基于机会MC的偶然计费能力的混合计费模型，提出了受控MC的调度策略和计费请求的排队管理方案。