| 摘要 |
PURPOSE:To enable information offer service, by transmitting the information from a radio base station with the request from a car station in a spectrum diffusing communication system, and discriminating if it is for the station itself or not with an identification signal in the signal. CONSTITUTION:An identification number indicating a car station 2 and a transmission request signal are transmitted to a radio base station 4 through a radio link 3 by using one of radio channels from the car station 2 in a redio zone 1. The radio base station 4 is connected to a road traffic information data base station 7 via an exclusive line 5 and a radio line controlling station 6. The road traffic information is transmitted in a spectrum diffusing communication system, by reusing the band corresponding almost to the entire radio channels assigned for the transmission from the base to the car stations. The car station 2 receives a spectrum diffusing communication signal in common to discriminate if it is for the station itself from the identification number in the demodulated output. |
