Energy efficiency (EE) is very crucial for future wireless communication systems, especially for cellular devices. Cellular network can cooperate with other wireless infrastructure for exploiting the detected spectrum holes to support energy-efficient cellular communication. TV white space (TVWS) can be used for Base station (BS) to User terminal (UT) communication with the aid of the existing cellular infrastructure. Since different wireless networks cognitively co-operate with cellular networks, this approach is termed as cognitive network cooperation. In order to achieve energy efficiency, relay station can be used as a cooperative partner with cellular base stations. To achieve this goal, the unused TV spectrum has to be identified. Than these unused frequencies (TV white space) and intermediate node (relay) can be used for signal transmission and reception from cellular BT and UT. The energy efficient performance relies on channel state information (CSI) of channels. Hence for energy efficient transmission of signal interference should be low. For a given number of information bits to be transmitted, the total energy consumed is significantly reduced, when both cognition and cooperation used in cellular networks, as compared with the conventional direct transmission, pure cognition, and pure cooperation.

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Cognitive Radio Co-operation Energy-efficiency Green Communication Tv Spectrum