Inter-Domain Multi-Controller Data Interaction Scheme Based on Blockchain in 6G Networks: A Novel Approach

Software-defined networking (SDN) is an essential trend in the future development of networks. Due to hardware limitations, its progress undoubtedly counts on distributed management with multiple controllers to oversee the global network. The multiple network controllers heavily rely on each other to provide network services. However, concerns regarding issues like commercial privacy leakage have given rise to a conflict between the imperative of privacy protection and the necessity of data sharing. This paper focuses on studying the conflict between privacy protection and collaborative sharing. By mapping blockchain nodes to corresponding controllers and deploying them independently, the trusted sharing of domain information is achieved. Leveraging 6G technologies, significant latency issues introduced by uplink and download transmissions are addressed. Abstract network data is encrypted using attribute-based encryption, ensuring sensitive information protection while reducing blockchain overhead. Furthermore, we have incorporated the Provenance Data model and established an alliance blockchain system for cross-SDN network operator management. Finally, a prototype system is implemented, and through rigorous testing, the system's functional effectiveness and high efficiency are demonstrated.