Random Leader: A Distributed-Centralized Spectrum Sharing Scheme in Cognitive Radios
In Cognitive Radio (CR) networks, Primary Users (PUs) can share their idle spectrums with Secondary Users (SUs) under certain mechanisms. Centralized schemes and market driven mechanisms are two major considerations in solving the spectrum sharing problems in the multiple-PU scenario. Centralized schemes can achieve the social optimal spectrum allocation among multiple PUs and multiple SUs but require a central control entity, which is impractical in the CR environment due to its distributed nature. Market-driven mechanisms can be implemented in a distributed manner but are hard to obtain the social optimal spectrum utilization in the multiple-PU scenario.