In this research paper Interference Model for Scheduling Algorithm in Cognitive Radio Networks (CRNs) is designed. In the advancement of 4G it plays vital role. [1]. The first phone call over a cognitive radio network was made on Monday 11 January 2010 in Centre for Wireless Communications at University of Oulu using CWC's cognitive radio network CRAMNET (Cognitive Radio Assisted Mobile Ad Hoc Network), that has been developed solely by CWC researchers Two types of CDMA based wireless networks are Cognitive radio networks (CRNs), and. Cooperative communication networks.[5] Same spectrum is shared in all instantaneous transmissions in the networks and interferes with one another In Cognitive radio, spectrum is inadequate resource in wireless communications. Currently, fixed spectrum slices are licensed to each wireless service technology. Recent studies [6] [8] have discovered that more than 80 % of spectrum is unutilized in rustic areas

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Equal Speed Allotment Proportional Speed Allotment CRN Interference Threshold