The unlicensed spectrum has plenty of bandwidth. For instance, approximately 500 MHz and 7 GHz
bandwidths are available in the 5 GHz and 60 GHz bands, respectively.
In order for the 5G system to utilize the unlicensed spectrum, regulations imposed on each frequency band should be carefully reconsidered. Representative examples of the regulations are the Transmit Power Control (TPC), Dynamic Frequency Selection (DFS), and Listen Before Talk (LBT).