Physical Layer Security for NOMA: Requirements, Merits, Challenges, and Recommendations

TL;DR

This paper reviews how physical layer security can enhance the security of NOMA wireless systems, discussing requirements, benefits, challenges, and future directions for integrating PLS with NOMA.

Contribution

It provides a comprehensive analysis of security requirements for NOMA and explores solutions, merits, and challenges of applying physical layer security in NOMA systems.

Findings

PLS can improve NOMA security without cryptography

Challenges include interference management and implementation complexity

Future research directions are identified for PLS in NOMA

Abstract

Non-Orthogonal Multiple Access (NOMA) has been recognized as one of the most significant enabling technologies for future wireless systems due to its eminent spectral efficiency, ability to provide an additional degree of freedom for Ultra Reliable Low Latency Communications (URLLC) and grant free random access. Meanwhile, Physical Layer Security (PLS) has got much attention for future wireless communication systems due to its capability to provide security without relying on traditional cryptography based algorithms. In this article, security design requirements for NOMA and solutions provided by PLS to fulfill these requirements are discussed. The merits and challenges arising from employing PLS to NOMA are identified. Finally, future recommendations and prospective solutions are also presented.