| 摘要 |
PURPOSE:To reduce charging signals from a control station, by measuring the time from the call start to the coming of the charging signal from the public corporation to detect a message billing index in the control station and by transmitting this message billing index information to a mobile station to generate a charging pulse in the mobile station. CONSTITUTION:Subscriber's telephone sets TEL1-TELn and a charging control part KTC which generates a charging signal for every start and lapse of a call unit time corresponding to the call distance are connected to an exchange EX2 of a telephone station LP in the public corporation side connected to a public corporation telephone line LP. A channel is connected to a public telephone set TELP in the side of a mobile station TS through one of base stations ZN1-ZNn by a trunk TRK of a control station MS. At this time, a charging signal such as a charging pulse is sent to the line LP from the control part KCT and is received by the trunk TRK, and a charging signal fa is sent to the mobile station TS through an exchange EX1, and the time till the next charging signal is measured to discriminate a message billing index, and message billing index information signal fb is transmitted, and a charging pulse is generated in the mobile station TS. |
