Massive Wireless Energy Transfer: Enabling Sustainable IoT Towards 6G Era
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Recent advances on wireless energy transfer led to a promising solution for powering future Internet of Things (IoT) devices enabled by the upcoming sixth generation (6G) era. In this paper, we overview the main architectures, challenges and techniques for efficient wireless powering. We emphasize on the suitability of Channel State Information (CSI)-free strategies when powering simultaneously a massive number of devices. We show that even without considering the energy resources required for CSI acquisition, the gains from operating with CSI decrease quickly as the number of powered devices increases, while distributed CSI-free strategies become even more advantageous by widening the energy coverage region with high reliability. Overall, advances in the system design and in resource allocation strategies are required for optimizing the energy supplying process, specially under the challenges imposed by future networks.
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