Recently, CR is under consideration for fourth generation (4G) mobile communication systems to complement more spectra for traffic growth. Long Term Evolution (LTE) over unlicensed spectrum such as 5 GHz and TVWS has been studied in Third Generation Partnership Project (3GPP) standardization [6–8] and is known as LTE-CR. One possible application scenario for LTE-CR is that when dual connectivity is supported, cognitive spectrum can be used for data transmission in small cells while licensed spectrum is used for the connection to macrocells. Alternatively, cognitive spectrum can also be exploited in standalone mode where the carrier supports both data transmission and control management as well as other licensed LTE carriers. In either mode, the LTE-CR network should be able to work on both licensed and harvested cognitive spectra.