Blockchain-based Hierarchical Spectrum Sharing Architecture and Resource Allocation Algorithm for CBRS System
Hang Hu, Rong Chai · 2021 IEEE 94th Vehicular Technology Conference (VTC2021-Fall) · 2021
To meet the rapidly increasing demand for spectrum access, citizens broadband radio service (CBRS) system was proposed as a novel spectrum sharing mechanism. While CBRS system is expected to improve spectrum efficiency and alleviate spectrum scarcity issue, it is subject to a single point of failure problem due to the logically centralized paradigm and is heavily relying on efficient resource management schemes. In this paper, we design a blockchain-based hierarchical spectrum sharing architecture for CBRS system. Jointly considering the consensus requirement of the blockchain network and the utility of CBRS system, we propose a new consensus mechanism called proof-of-utility (PoU) which achieves the tradeoff in utility optimization between local entities and global system while ensuring the consistency of nodes. Then, a heuristic sub channel and power allocation algorithm is presented to achieve efficient resource sharing among entities in CBRS system. Simulation results demonstrate the effectiveness of the proposed consensus mechanism and algorithm.