Access-Side DDoS Defense for Space-Air-Ground Integrated 6G V2X Networks

Distributed Denial of Service (DDoS) attacks pose a significant threat to the Internet of Vehicles, causing delays in driving operations and risking personal safety. With the emerging of Space-Air-Ground Integrated Sixth-Generation (6G) networks, DDoS defense faces new challenges, especially in open and complex Vehicle-to-Everything (V2X) connections. In this study, we reviewed the requisites and challenges of DDoS defense in V2X and introduced a tailored access-side defense architecture for Space-Air-Ground Integrated 6G V2X. The objective is to provide ultra-low latency and privacy-assured services despite limited communication resources. Our architecture uses access-side control points (CPs) for rapid attack responses, collaborating with local controllers to create a seamless defense perimeter at the network edge. This prevents malicious traffic infiltration. Incorporating proactive defense strategies and lightweight detection methods, our approach ensures high attack detection rates with low defense costs. Simulation results confirm its efficacy and advantages in defense and network efficiency. We also discuss open issues for future research to facilitate practical applications.