WIRELESS BASE STATION, USER TERMINAL, AND WIRELESS COMMUNICATION SYSTEM

摘要

The present invention is designed so that LBT (Listen Before Talk) is performed adequately in a radio communication system (LAA) to run LTE in an unlicensed band. A radio base station to communicate with a user terminal that is capable of using a licensed band and an unlicensed band has a control section that controls the transmission of downlink signals in the unlicensed band using LBT, a selection section that selects the symbol to execute LBT, randomly, with equal probability, from a plurality of candidate symbols, and an acquiring section that acquires a measurement result, in which the received signal intensity in the LBT period is measured, wherein, when the control section judges that the channel of the unlicensed band is in an idle state from the measurement result of received signal intensity, the control section executes control so that a beacon reference signal is transmitted in all of the candidate symbols that follow the symbol in which LBT was executed.