Joint Resource Allocation and Configuration Design for STAR-RIS-Enhanced Wireless-Powered MEC

In this paper, a novel concept called simultaneously transmitting and reflecting RIS (STAR-RIS) is introduced into the wireless-powered mobile edge computing (MEC) systems to improve efficiency of energy transfer task offloading. Compared with traditional reflecting-only RIS, STAR-RIS extends half-space coverage full-space by incident signals, also provides new degrees-of-freedom (DoFs) for manipulating signal propagation. We aim maximize total computation rate all users, where time, transmit power CPU frequencies configuration design are jointly optimized. Considering characteristics STAR-RIS, three operating protocols, namely splitting (ES), mode switching (MS), time (TS) studied, respectively. For ES protocol, based on penalty method, successive convex approximation (SCA), linear search an iterative algorithm proposed solve formulated non-convex problem. Then, protocol extended MS TS problems. Simulation results illustrate that outperforms reflecting/transmitting-only RIS. More importantly, can achieve largest among protocols STAR-RIS.