The Role of Physical Layer Security in Satellite-Based Networks

TL;DR

This paper reviews how physical layer security techniques are applied to satellite-based networks, emphasizing their importance in safeguarding future 6G satellite-terrestrial communications amidst security challenges.

Contribution

It provides a comprehensive review and categorization of PLS methods in satellite networks, outlining future research directions and opportunities.

Findings

PLS enhances security in satellite communications.

Categorization of satellite network architectures using PLS.

Identification of future research opportunities in PLS for satellite networks.

Abstract

In the coming years, 6G will revolutionize the world with a large amount of bandwidth, high data rates, and extensive coverage in remote and rural areas. These goals can only be achieved by integrating terrestrial networks with non-terrestrial networks. On the other hand, these advancements are raising more concerns than other wireless links about malicious attacks on satellite-terrestrial links due to their openness. Over the years, physical layer security (PLS) has emerged as a good candidate to deal with security threats by exploring the randomness of wireless channels. In this direction, this paper reviews how PLS methods are implemented in satellite communications. Firstly, we discuss the ongoing research on satellite-based networks by highlighting the key points in the literature. Then, we revisit the research activities on PLS in satellite-based networks by categorizing the different system architectures. Finally, we highlight research directions and opportunities to leverage the PLS in future satellite-based networks.