Evaluation of available channel quality for secondary usage in cognitive radio networks

Interference mitigation is the most important concern in cognitive radio networks because of exclusive usage right of incumbents on licensed bands. However, to alleviate the issue of spectrum scarcity, secondary users also are allowed to capture the licensed bands in an opportunistic manner without any harmful interference to the primary users. In this paper, we try to rank the available spectrum bands and calculate idle and busy time of licensed channels for secondary usage in order to save precious network resources.