Radio base station synchronizing responsive to conditions being met

摘要: In the case of radio base stations different kinds, a synchronization in section cannot be established so that efficiently effective use electric waves retained. According to invention, therefore, there is provided TDMA type mobile communication system 100 comprising: plurality kinds (i.e., general station 1 , an IP connection 10 and main digital cordless phone 2 ); phones 5 A B wirelessly connected with plural stations; private branch exchange 4 wired stations. The receives, when synchronized operation mode decided, frame signal containing control CH signal, from reference station); times transmission local position thereby establish between own station.