Energy-Efficient Design for IRS-Assisted MEC Networks with NOMA

TL;DR

This paper proposes an energy-efficient design for IRS-assisted MEC networks with NOMA, jointly optimizing multiple parameters to maximize energy efficiency in IoT networks.

Contribution

It introduces a novel joint optimization framework for IRS-assisted MEC networks with NOMA, employing SDR-based algorithms to enhance energy efficiency.

Findings

The proposed design outperforms benchmark schemes in energy efficiency.

IRS and NOMA significantly improve MEC network performance.

The optimization approach effectively handles non-convex fractional objectives.

Abstract

Energy-efficient design is of crucial importance in wireless internet of things (IoT) networks. In order to serve massive users while achieving an energy-efficient operation, an intelligent reflecting surface (IRS) assisted mobile edge computing (MEC) network with non-orthogonal multiple access (NOMA) is studied in this paper. The energy efficiency (EE) is maximized by jointly optimizing the offloading power, local computing frequency, receiving beamforming, and IRS phase-shift matrix. The problem is challenging to solve due to the non-convex fractional objective functions and the coupling among the variables. A semidefinite programming relaxation (SDR) based alternating algorithm is developed. Simulation results demonstrate that the proposed design outperforms the benchmark schemes in terms of EE. Applying IRS and NOMA can effectively improve the performance of the MEC network.