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In Cognitive Radio Networks (CRNs), Primary Users (PUs) can share their idle spectra with Secondary Users (SUs) under certain mechanisms. In this paper, the authors propose a distributed-centralized and incentive-aware spectrum sharing scheme for the multiple-PU scenario, which introduces a random leader who is elected randomly from SUs or PUs. The distributed aspect of their scheme lies in that it requires no central control entities, which can be independently implemented within a distributed spectrum market. The centralized aspect is that the leader draws up and assigns the socially optimal contracts for all PUs and SUs in a centralized manner, which maximizes the throughput of the whole network and attains the economic robustness (including incentive compatibility and individual rationality).
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