Computation energy efficiency maximization based resource allocation scheme in wireless powered mobile edge computing network

For wireless powered mobile edge computing (MEC) network, a system computation energy efficiency (CEE) maximization scheme by considering the limited computation capacity at the MEC server side was proposed. Specifically, a CEE maximization optimization problem was formulated by jointly optimizing the computing frequencies and execution time of the MEC server and the edge user(EU), the transmit power and offloading time of each EU, the energy harvesting time and the transmit power of the power beacon. Since the formulated optimization problem was a non-convex fractional op-timization problem and hard to solve, the formulated problem was firstly transformed into a non-convex subtraction problem by means of the generalized fractional programming theory and then transform the subtraction problem into an equivalent convex problem by introducing a series of auxiliary variables. On this basis, an iterative algorithm to obtain the optimal solutions was proposed. Simulation results verify the fast convergence of the proposed algorithm and show that the proposed resource allocation scheme can achieve a higher CEE by comparing with other schemes. © 2020, Editorial Board of Journal on Communications. All right reserved.