关键词: 认知无线电, 集中式网络, 频谱共享, 分簇

Abstract: Following some rules, the Cognitive Radio Networks（CRNs） can be divided into several clusters, each cluster has a Common Control Channel（CCC） to exchange control information. The cluster-based CCC is one of the solutions to the problem in spectrum sharing for CRNs. According to the characteristics of idle channel in CRNs, a new clustering algorithm is proposed, with the aim of maximizing the cluster throughput and maintaining the cluster stability, considers three factors: available channels, geographical position and database statistics is proposed. Then, several cluster maintenance issues are discussed. Simulation results reveal that the proposed clustering algorithm generates small number of clusters in the network, and can maintain the stability of network topology by reducing the reclustering times.

Key words: cognitive radio, centralized network, spectrum sharing, clustering