A communication device capable of performing communication via a second wireless communication system that is different from a first wireless communication system, in a frequency band that is used by the first wireless communication system, the first wireless communication system periodically transmitting a reference signal, the communication device comprising:
- a communication circuit;
- and
- a controller that controls the communication circuit,
- wherein
- the communication device is a base station device of the second wireless communication system capable of performing communication via the second wireless communication system in the frequency band, and
- the controller
- controls the communication circuit to transmit, to a base station device of the first wireless communication system, information for operating the base station device in a mode in which the periodical transmission of the reference signal is interrupted for a predetermined period, and
- controls the communication circuit to perform communication involving transmission of a predetermined signal of the second wireless communication system while the base station device of the first wireless communication system is operating in the mode.