Published in IEEE Transactions on Cognitive Communications and Networking, 2023
In this paper, we first design a user-centric privacy-preserving framework based on decentralized Federated Learning (FL) for healthcare metaverses. To further improve the privacy protection of healthcare metaverses, a cross-chain empowered FL framework is utilized to enhance sensing data security. This framework utilizes a hierarchical cross-chain architecture with a main chain and multiple subchains to perform decentralized, privacy-preserving, and secure data training in both virtual and physical spaces. Moreover, we utilize Age of Information (AoI) as an effective data-freshness metric and propose an AoI-based contract theory model under Prospect Theory (PT) to motivate sensing data sharing in a user-centric manner. This model exploits PT to better capture the subjective utility of the service provider.
Recommended citation: Jiawen Kang, Jinbo Wen, Dongdong Ye, Bingkun Lai, Tianhao Wu, Zehui Xiong, Jiangtian Nie, Dusit Niyato, Yang Zhang, and Shengli Xie, "Blockchain-empowered federated learning for healthcare Metaverses: User-centric incentive mechanism with optimal data freshness," IEEE Transactions on Cognitive Communications and Networking, pp. 348-362, Feb 2024. https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10254627