A radio base station system includes a processing device for carrying out baseband signal processing and a radio device connected by the CPRI to the processing device for carrying out RF signal processing. The radio device includes a measurement unit for measuring the current state of an object of measurement and supplying measurement data representing this current state as output, and a first communication unit for using Fast C&M Channel fields of the CPRI to transmit the measurement data supplied by the measurement unit to the processing device. The processing device includes a second communication unit that uses Fast C&M Channel fields of the CPRI to receive the measurement data from the first communication unit.