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

Qin, Xintong and Song, Zhengyu and Hou, Tianwei and Yu, Wenjuan and Wang, Jun and Sun, Xin (2023) Joint Resource Allocation and Configuration Design for STAR-RIS-Enhanced Wireless-Powered MEC. IEEE Transactions on Communications. ISSN 0090-6778

[img]
Text (FINAL_VERSION)
FINAL_VERSION.pdf - Accepted Version
Available under License Creative Commons Attribution.

Download (2MB)

Abstract

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

Item Type:
Journal Article
Journal or Publication Title:
IEEE Transactions on Communications
Additional Information:
©2023 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/2200/2208
Subjects:
ID Code:
186908
Deposited By:
Deposited On:
21 Feb 2023 09:45
Refereed?:
Yes
Published?:
Published
Last Modified:
31 Mar 2023 00:54