Reconfigurable Intelligent Surfaces for 6G Non-Terrestrial Networks: Assisting Connectivity from the Sky

TL;DR

This paper explores the integration of reconfigurable intelligent surfaces with non-terrestrial networks, particularly LEO satellites and high-altitude platforms, to enhance next-generation sky-based connectivity.

Contribution

It introduces a novel framework for RIS-assisted LEO satellite communications involving HAP-mounted RIS, advancing the understanding of RIS integration in NTNs.

Findings

Proposes a new RIS-enabled NTN framework with HAP-mounted RIS.

Highlights open challenges and future research directions.

Synthesizes recent advances in RIS technology for NTNs.

Abstract

This paper studies the potential of RIS-integrated NTNs to revolutionize the next-generation connectivity. First, it discusses the fundamentals of RIS technology. Secondly, it delves into reporting the recent advances in RIS-enabled NTNs. Subsequently, it presents a novel framework based on the current state-of-the-art for low earth orbit satellites (LEO) communications, wherein the signal received at the user terminal traverses both a direct link and an RIS link, and the RIS is mounted on a high-altitude platform (HAP) situated within the stratosphere. Finally, the paper concludes by highlighting open challenges and future research directions to revolutionize the realm of RIS-integrated NTNs.