Energy harvesting communications: Part III [Guest Editorial]

“A Hierarchical Packet Forwarding Mechanism for an Energy Harvesting Wireless Sensor Network” by Dapeng Wu et al., which investigates a dynamic gradient-aware hierarchical packet forwarding mechanism based on the relative positions of the sensor nodes. The article “Wireless Information and Power Transfer: From Scientific Hypothesis to Engineering Practice,” by Rong Zhang et al., surveys the state-of-the-art findings on simultaneous wireless information and power transfer (SWIPT), including design challenges, potential solutions, and research ideas. The article “Delay-Sensitive Dynamic Resource Control for Energy Harvesting Wireless Systems with Finite Energy Storage,” written by Fan Zhang et al., studies optimizationof the delay performance of energy harvesting wireless systems with finite energy storage, covering the resource allocation to the channel fading information, data queue length, and energy queue. The article “Toward Secure Energy Harvesting Cooperative Networks,” by Jiawen Kang et al., addresses the security issues and solutions in energy harvesting cooperative networks, where the vulnerability of energy cooperation models in energy attacks is analyzed, and several energy defense solutions are proposed.