Age Minimization in Outdoor and Indoor Communications with Relay-aided Dual RIS

TL;DR

This paper proposes a relay-aided double-sided RIS system for outdoor and indoor wireless networks, optimizing scheduling to minimize age of information, and demonstrates significant performance improvements through an iterative optimization algorithm.

Contribution

It introduces a novel relay-aided double-sided RIS architecture and an SCA-based alternating optimization algorithm for AoI minimization in wireless networks.

Findings

Significant reduction in age of information compared to benchmarks.

Effective performance improvement demonstrated through simulations.

Validates the benefits of relay-aided double-sided RIS in wireless communication.

Abstract

In this paper, we investigate an outdoor and indoor wireless communication network with the assistance of a novel relay-aided double-sided reconfigurable intelligent surface (RIS). A scheduling problem is considered at the outdoor access point (AP) to minimize the sum of age of information (AoI). To serve the indoor users and further enhance the wireless link quality, a novel double-sided RIS with relay is utilized. Since the formulated problem is non-convex with highly-coupled variables, a successive convex approximation (SCA) based alternating optimization (AO) algorithm is proposed to solve it in an iterative manner. Finally, simulation results show the effectiveness and significant performance improvement in terms of AoI of the proposed algorithm compared with other benchmarks.