Robust Clustering of Ad-Hoc Cognitive Radio Networks Under Opportunistic Spectrum Access

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The time and space varying nature of channel availability among cognitive radio nodes challenges connectivity and robustness of ad-hoc cognitive radio networks. Clustering of neighboring cognitive radio nodes is a suitable approach to address this challenge, which enables cooperative spectrum sensing, supports a coordinated channel switching and simplifies routing in ad-hoc cognitive radio networks. However, the sudden appearance of primary nodes can lead to the loss of connectivity within a cluster or between clusters. This impact can be mitigated to some extent by the way clusters are formed.