Base station apparatus and the terminal apparatus

There has been a problem that since the transmission period of a synchronization signal sometimes becomes longer according to the use situation of an unlicensed band, a terminal device requires a long time to measure the received powers of signals from a plurality of base station devices that perform communication in the unlicensed band. A base station device communicates with a terminal device in a second frequency band different from an exclusively usable first frequency band, comprises a DL signal generation unit for generating a signal to be transmitted to the terminal device, a radio transmission unit for transmitting the signal, and a connected terminal management unit for receiving information relating to a plurality of subframes capable of transmitting a signal from another base station device that communicates with the terminal device in the first frequency band to the terminal device, generates a subframe composed of a synchronization signal and a reference signal by the DL signal generation unit, and transmits the subframe in at least one subframe among subframes included in the information relating to the plurality of subframes by the radio transmission unit.