Reputation Mechanism Designed for Blockchain Empowered Dynamic Spectrum Sharing System

Blockchain-based dynamic spectrum sharing (DSS) is viewed as a robust measure to address the management and allocation of spectrum resources for Internet of Things (IoT) ecosystems in a secure and auditable manner. However, existing blockchain empowered DSS systems commonly assume the perfect communications among the nodes without any interference and throughput constraints, which will mislead the spectrum owner into making suboptimal decisions, especially under the time-varying and unstable channel situation in IoT. To overcome the influence of the imperfect channel situations on DSS, we propose a novel reputation mechanism-based blockchain empowered DSS system in this paper. By considering both the historical transaction successful rate and the communication throughput and the real-time channel situations, the reputation mechanism enables the spectrum owner to make the appropriate decisions even under the occurrence of the deep decay. Furthermore, the spectrum trading process is formulated as a Stackelberg game to encourage the participation of the spectrum owner and the requester. A pricing scheme is proposed by maximizing the utilities of all nodes jointly. Simulation results confirm that our proposed scheme is superior to existing works in revenue utility.