Trustworthiness Evaluation Toward 6G Support of Space-Air-Ground Integrated Network

As a significant trend in next-generation mobile communications, the sixth-generation (6G) wireless communication networks are evolving toward complexity and diversity. Blockchain-driven networks offer trustworthy services and shared information for 6G while demanding enhanced multi-party trustworthiness and secure collaboration. In this article, a space-air-ground integrated network based on blockchain is investigated, which provides trustworthy 6G networks for users. The trustworthy state of service-providing nodes (such as low earth orbit satellites, unmanned aerial vehicles, and base stations) is quantified, and a practical byzantine fault tolerance algorithm based on node trustworthiness is designed to prevent unauthorized access and data leakage. Meanwhile, an adaptive trustworthiness evaluation system is constructed, which evaluates the network from the perspectives of security, privacy, and resilience. Novel trustwor-thiness indicators are proposed, such as transmission outage probability, user behavior information leakage probability, and network stable operation probability. Finally, the simulation results confirm the performance of the space-air-ground integrated community network and validate the effectiveness of the proposed indicators.