Communication-efficient Federated Learning and Permissioned Blockchain for Digital Twin Edge Networks

Emerging technologies such as Mobile Edge Computing (MEC) and next generation communications are crucial for enabling rapid development and deployment of Internet of Things (IoT). With the increasing scale of IoT networks, how to optimize the network and allocate the limited resources to provide high-quality services, remains as a major concern. Existing work in this direction mainly relies on models that are of less practical value for resource limited IoT networks, and can hardly simulate the dynamic systems in real-time. In this paper, we integrate digital twins with edge networks and propose the Digital Twin Edge Networks (DITEN) to fill the gap between physical edge networks and digital systems. Then, we propose a blockchain empowered federated learning scheme to strengthen communication security and data privacy protection in DITEN. Furthermore, to improve efficiency of the integrated scheme, we propose an asynchronous aggregation scheme and use digital twin empowered reinforcement learning to schedule relaying users and allocate bandwidth resources. Theoretical analysis and numerical results confirm that the proposed scheme can considerably enhance both communication efficiency and data security for IoT applications.