Institute of Electrical and Electronics Engineers
The essential impediment to apply Cognitive Radio (CR) technology for efficient spectrum utilization lies in the uncertainty of licensed spectrum supply. In this paper, the authors propose a novel architecture for spectrum harvesting and sharing, and investigate the joint routing and frequency scheduling problem in multi-hop Cognitive Radio Networks (CRNs) under uncertain spectrum supply. They introduce a new service provider, Secondary Service Provider (SSP), to facilitate the accessing for Secondary Users (SUs). They model the vacancy of available bands with a series of random variables, and mathematically describe the corresponding frequency scheduling and flow routing constraints.