Reconfigurable Intelligent Surface-Aided Energy-Efficient Mobile Edge Computing in OFDM Systems

IF 4.4 3区计算机科学 Q2 TELECOMMUNICATIONS

IEEE Communications Letters Pub Date : 2025-04-29 DOI:10.1109/LCOMM.2025.3565260

Lou Zhao;Chao Sun;Wei Ni;Derrick Wing Kwan Ng

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Abstract

This letter proposes a novel resource allocation algorithm to enable a reconfigurable intelligent surface (RIS) to support delay-bounded mobile edge computing (MEC) in orthogonal frequency division multiplexing (OFDM) settings, adhering to per-subcarrier power constraint. The energy requirement of the smart devices (SDs) is minimized through the joint optimization of task offloading parameters, RIS configuration, and the receive beamforming of the base station (BS). A key contribution is that we find the semi-closed-form receive beamformers as a function of the RIS phases. Hence, the joint optimization is decoupled between convex offloading scheduling and non-convex RIS configuration by alternating optimization (AO). Another contribution is that we convexify the per-subcarrier power constraint by exploiting successive convex approximation (SCA), and acquiring a Karush-Kuhn-Tucker (KKT) point solution for the RIS configuration. Numerical results show the superiority of the new approach compared with baseline schemes in energy saving, and reveal that the optimal RIS location hinges on the channel quality differences among the RIS, BS, and SDs.

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OFDM系统中可重构智能表面辅助节能移动边缘计算

本文提出了一种新的资源分配算法，使可重构智能曲面（RIS）能够在正交频分复用（OFDM）设置中支持延迟受限的移动边缘计算（MEC），并坚持每个子载波功率约束。通过对任务卸载参数、RIS配置和基站接收波束形成的联合优化，使智能设备的能量需求最小化。一个关键的贡献是我们发现了半封闭形式的接收波束形成器作为RIS相位的函数。因此，采用交替优化（AO）方法将凸卸载调度与非凸RIS配置的联合优化解耦。另一个贡献是我们通过利用连续凸逼近（SCA）凸化每个子载波功率约束，并获得RIS配置的Karush-Kuhn-Tucker （KKT）点解。数值结果表明，与基线方案相比，该方法在节能方面具有优势，并且RIS、BS和sd之间的信道质量差异决定了RIS的最优位置。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

IEEE Communications Letters 工程技术-电信学

CiteScore

8.10

自引率

7.30%

发文量

590

审稿时长

2.8 months

期刊介绍： The IEEE Communications Letters publishes short papers in a rapid publication cycle on advances in the state-of-the-art of communication over different media and channels including wire, underground, waveguide, optical fiber, and storage channels. Both theoretical contributions (including new techniques, concepts, and analyses) and practical contributions (including system experiments and prototypes, and new applications) are encouraged. This journal focuses on the physical layer and the link layer of communication systems.