Physical Layer Security in UAV Systems: Challenges and Opportunities

TL;DR

This paper reviews physical layer security challenges in UAV wireless systems, discussing attack types, emerging countermeasures like trajectory design and cooperative strategies, and future research directions to enhance security and efficiency.

Contribution

It provides a comprehensive overview of security issues and innovative techniques such as trajectory optimization and advanced communication technologies in UAV systems.

Findings

Passive and active eavesdropping are primary threats.

Emerging techniques include trajectory design and resource allocation.

Integration of NOMA, MIMO, and millimeter wave enhances security and spectral efficiency.

Abstract

Unmanned aerial vehicle (UAV) wireless communications have experienced an upsurge of interest in both military and civilian applications, due to its high mobility, low cost, on-demand deployment, and inherent line-of-sight (LoS) air-to-ground channels. However, these benefits also make UAV wireless communication systems vulnerable to malicious eavesdropping attacks. In this article, we aim to examine the physical layer security issues in UAV systems. In particular, passive and active eavesdroppings are two primary attacks in UAV systems. We provide an overview on emerging techniques, such as trajectory design, resource allocation, and cooperative UAVs, to fight against both types of eavesdroppings in UAV wireless communication systems. Moreover, the applications of non-orthogonal multiple access, multiple-input and multiple-output, and millimeter wave in UAV systems are also proposed to improve the system spectral efficiency and to guarantee security simultaneously. Finally, we discuss some potential research directions and challenges in terms of physical layer security in UAV systems.