Rotatable Antenna-Enabled Mobile Edge Computing

TL;DR

This paper proposes a rotatable antenna-enabled MEC system that optimizes resource allocation, beamforming, and antenna angles to significantly reduce computation latency for latency-critical users.

Contribution

It introduces a novel joint optimization framework for RA-enabled MEC, combining AO, SDR, FP, and SCA techniques for the first time.

Findings

Significant latency reduction compared to benchmarks.

Effective joint optimization of resources and antenna angles.

Validation through simulations demonstrating improved performance.

Abstract

In the evolving landscape of mobile edge computing (MEC), enhancing communication reliability and computation efficiency to support increasingly stringent low-latency services remains a fundamental challenge. Rotatable antenna (RA) is a promising technology that introduces new spatial degrees of freedom (DoFs) to tackle this challenge. In this letter, we investigate an RA-enabled MEC system where antenna boresight directions can be independently adjusted to proactively improve wireless channel conditions for latency-critical users. We aim to minimize the maximum computation latency by jointly optimizing the MEC server computing resource allocation, receive beamforming, and the deflection angles of all RAs. To address the resulting non-convex problem, we develop an efficient alternating optimization (AO) framework. Specifically, the optimal edge computing resource allocation is derived based on the Karush-Kuhn-Tucker (KKT) conditions. Given the computing resources, the receive beamforming is optimized using semidefinite relaxation (SDR) combined with a bisection search. Furthermore, the RA deflection angles are optimized via fractional programming (FP) and successive convex approximation (SCA). Simulation results verify that the proposed RA-enabled MEC scheme significantly reduces the maximum computation latency compared with conventional benchmark methods.