A base station that performs wireless communication with a terminal using a first frequency band which does not need the license to use for the wireless communication, the base station includes: a controller configured to generate a request signal for requesting data transmission of the terminal in the first frequency band and specifying a first transmission timing of the terminal; and a transmitter configured to transmit to the terminal the request signal, wherein, the request signal includes information used for specifying a second transmission timing, which is a next transmission timing when the terminal does not perform data transmission at the first transmission timing and is specified by an offset from a reference timing.