RADIO STATION, TRANSMITTING STATION, AND FREQUENCY BAND SHARING METHOD

摘要

PROBLEM TO BE SOLVED: To expand a signal transmission opportunity in a second radio communication system, that is a non-priority system, and to prevent signal quality deterioration in a first radio communication system that is a priority system.SOLUTION: This frequency band sharing method includes: a step where a transmitting station in a second radio communication system determines whether transmission of a second radio communication system signal using a shared frequency band is possible or not based on load information of a first radio communication system broadcast from a base station in the first radio communication system; a step where the transmitting station in the second radio communication system calculates predicted interference power caused in a receiving station in the first radio communication system by the second radio communication system signal transmitted using the shared frequency band; and a step where the base station in the first radio communication system increases an allowable interference level of a first radio communication system signal transmitted using the shared frequency band based on the predicted interference power broadcast from the transmitting station in the second radio communication system.