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Opportunistically accessing the licensed spectrum of the primary user (PU) by the secondary user (SU) without creating interference in the primary user, this phenomenon increases the usability of existing allocated frequency spectrum and reduces the scarcity of radio band availability, hence only 6% of total allocated spectrum/licensed spectrum are now being fully exploited [1]. The increasing demand of cognitive radio and its application also increase the urge to make energy efficient cognitive radio because it is an emerging technology and to meet the future demand of cognitive radio will target the Adhoc structure of communication where battery consumption is one of the major issues in adhoc/mobile devices. So to develop energy efficient MAC protocol for Cognitive Radio Adhoc Network (CRAN) is now today's need. The proposed technique of opportunistically acquiring radio channel without creating …