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In a radio communication system that transmits reference signals for identifying a plurality of base stations from the base station to mobile stations, base station identification patterns for identifying base stations are generated by providing a method for dividing a frequency domain in a frequency-time domain given with the frequency domain and a time domain into a plurality of sub-bands. Reference signal patterns are determined in a predetermined time domain within the time domain at each of the sub-bands. In this way, the number of base stations that can be identified is increased.