Abstract: A method for servicing communications between a base station and plural mobile stations which are linked by a radio line in which plural communication channels are set, comprising the steps of setting an identifier indicating a mobile station in slot units corresponding to each of the plural communication channels, and communicating with plural mobile stations in the same communication channel.

Abstract: A paging system allows an on-board radio unit of a vehicle telephone for business use to serve as a repeater as needed. An on-board repeater is mounted on the same vehicle as the on-board radio unit while a portable unit is removably mounted on the repeater. When the portable unit is removed from the on-board repeater, the on-board radio unit functions as a repeater. Even when a person who uses the vehicle on which the telephone is mounted is away from the vehicle with the portable unit, a desired voice message can be transferred to the person immediately.

Abstract: A communication system may perform talking and data transmission by a polling process which are carried out between a plurality of terminal units and a central control station. The system is capable of interruption talk during data transmission. The central control station is provided with time slots for use in interruption, which is given at appropriate time intervals in the polling process. Thus, until the predetermined polling is finished, the central control station repeats the steps of (i) generating interruption acceptance signals at appropriate intervals in the polling mode, (ii) thereafter giving a plurality of time slots for receiving the interruption signals from the terminal units, and (iii) when interruption signals from the terminal units are received in the plurality of time slots, returning to the talk mode by generating a polling finish signal and terminating the polling or by simply terminating the polling. When interruption signals are not received, the polling is continued.