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With 5G being commercially deployed worldwide,research into 6G mobile communication networks has started. One of the major key performance indicators for 6G is its extremely massive connectivity for small devices to enable so-called Internet of Everything (IoE),which is a scale up from Intemet of Things (IoT). Most of these IoE devices will be either battery-powered or battery-less. How to prolong the lifetime of these IoE devices becomes a key challenge.