Residual Energy Maximization based Resource Allocation in Wireless Powered Edge Computing Industrial IoT

Industrial Internet of Things (IIoT) is a new stage for traditional industry to achieve intelligent development. However, the problems of limited resource, communication congestion and capacity-constrained batteries have emerged due to massive wireless sensing devices (WSDs). With the recent advent of wireless power transfer (WPT) technique and development of edge computing technology, the IIoT pays much attention to the interconnected, instant and high-intelligent system. In this paper, we first consider a three-layer architecture to describe the IIoT environment, and we propose a resource allocation strategy aiming at maximizing the residual energy of WSDs. The optimization of residual energy is formulated as a mixed-integer non-convex programming NP hard problem, by constraining the offloading decision, power allocation, computing resource allocation, and time allocation. In addition, an improved hybrid whale optimization algorithm (IHWOA) is proposed to search for the approximate optimal solution. Rapid convergent and stable efficient solution is obtained through simulation experiments. Finally, numerical results prove that the proposed solution achieves good performance.