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Lecture notes in electrical engineering

Quantum Communication for 5G-A: Revolutionizing Security and Network Performance

Dan Tu, Zhirong Zhang, Jie Wang

Published Jan 1, 2026• 0 citations
Publisher
DOI
10.1007/978-981-92-0232-4_29

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The fifth generation of mobile networks (5G) is among the critical infrastructures whose security and privacy requirements are paramount. Compared to previous generations, 5G leverages a service-based architecture where many Network Functions (NF), i.e., the set of microservices on which is based the architecture, need secure communication means. NFs can communicate using HTTP2, and despite not being required by the standard, they can use Transport Layer Protocol (TLS) to ensure data integrity and authentication across the network. However, with the expected arrival of quantum computers in the near future, traditional cryptographic algorithms are under significant threat. With the recent run for post-quantum standardization, the NIST selected possible candidate algorithms. However, no study evaluates whether such algorithms would be applicable in the 5G core without significant performance degradation. In this paper, we perform the first assessment of the feasibility of using post-quantum secure Key Encapsulation Mechanism (KEM) for the 5G core network. To this aim, we implemented and compared the performances of five algorithms among those selected during the NIST standardization process. We adapted those algorithms to implement them in a standalone 5G core implemented via Open5GS, and tested their performance when performing user registration. Our results show that the KY-BER768 achieves comparable performance to TLS in terms of UE registration time and CPU utilization, thus being a candidate solution to improve the security posture of the 5G core.
In the digital age, 5G technology has significantly enhanced global communication capabilities, providing strong support for various industries. However, 5G falls short of achieving comprehensive intelligence within the Internet of Things (IoT), propelling the development of 6G technology. 6G is expected to further enhance network performance by integrating advanced technologies such as AI and quantum communication, while expanding application scenarios to include communication in extreme environments for comprehensive global connectivity. This paper proposes an innovative fronthaul architecture that applies Quantum Key Distribution (QKD) technology to the 5G fronthaul, leveraging its unconditionally secure key generation and distribution mechanism. In this design, costlier Alice devices are placed on the AAU side, while less expensive Bob devices are positioned on the DU side, optimizing deployment to reduce engineering costs and lower deployment barriers. The feasibility of this architecture is demonstrated by calculating the secure key rate. Comparative analysis with existing research is performed to clarify future research directions. These innovations not only enhance 5G network security but also offer new solutions for the security requirements of 6G networks, such as data security, network resilience, and algorithm transparency. Our research offers strategic value for future network security, laying the groundwork for reliable networks.