IEEE 802.22 standard is based on Cognitive Radio Network (CRN). It allows opportunistic use of TV white space as spectrum holes by secondary user. The existing methods used for spectrum access in cognitive Third Generation Partnership Project (3GPP) Long Term Evaluation (LTE) network-based on IEEE 802.22 standard are not power efficient. In this paper, power efficient Dynamic Spectrum Access (DSA) method in cognitive 3GPP LTE network-based on IEEE 802.22 is proposed. This paper enhances the transmission power efficiency along with spectral efficiency.