| 摘要 |
PURPOSE:To easily discriminate the present position by sending a control signal including a different zone data from a base station at a level receptible by a mobile station in each zone and allowing each mobile station to identify a received zone data. CONSTITUTION:A variable attenuator 15 of a base station 10 controls an output of a level transmission section 13 to a level received by mobile stations 20A-20C in plural zones through a control section 14 and the station 10 sends the output to a zone data specific to each zone. Reception sections 22A-22C of the mobile stations 20A-20C detect the zone data to inform it to annunciators 25A-25C through control sections 24A-24C. Discriminating zone belonging to its own station, the mobile stations 20A-20C communicate with the base station 10. Thus, the interruption of the communication due to a mobile station stepping out of the service area of the base station 10 is prevented. |
