With the growing demand of high speed data on move, the spectrum is becoming scarce and to use limited spectrum efficiently, the cognitive radio came up with promise in the last decade to deliver the needs of modern wireless communication. In this paper, the energy detection based on non-cooperative sensing technique for cognitive radio under different non-time dispersive radio environments is used. In this proposal, Global System for Mobiles is studied in terms of unwanted and blocking interference to the primary user base station from the secondary user mobile station at different detection threshold of secondary user.