A Survey on Distributed Opportunity Spectrum Access in Cognitive Network

Cognitive radio has the potential to resolve the paradox of limited available radio resources and underutilization spectrum usage by opportunistically exploiting idle frequency. Opportunity identification and exploitation are the most challenging issues due to the spectrum opportunities varied in both temporal and spatial domains. We focus on distributed methods of opportunity spectrum access based on local policies which are more feasible in available networks. In this article we first present the general system model in cognitive network, following with the listed utility functions. An overview of distributed OSA approaches is then provided. Finally, we conclude the related issues for future research.