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Cognitive radio has been proposed in order to promote spectrum utilization by exploiting the spectrum holes. Observing the spectrum resources can be matched to traffic demand of secondary users with the help of relay node. In this article a new research direction for cognitive radio networks by utilizing cooperative relay to assist transmission and improve communication efficiency. Since wireless networks are characterized to have limited resources which are accessed by a large number of mobiledoi:10.9790/2834-1104022735 fatcat:jx6ozlphorbcbof2h6vp2urz2u