Importance

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Abstract

A mobile radio communication system has a base station, first through N-th mobile stations communicating with the base station through a radio channel carrying a communication signal, where N represents a positive integer which is greater than one, and a main station connected to the base station through a communication path having a path propagation delay time. The main station communicates with the first through the N-th movable stations by the communication signal. The communication signal has a first frame and a second frame following the first frame. The second frame may be followed by the first frame with a predetermined period interposed between the second frame and the first frame. The first frame has first primary through N-th primary time slots which are arranged in sequential order. The second frame has first subsidiary through N-th subsidiary time slots which are arranged in sequential order. The main station has a detecting circuit for detecting whether or not the path propagation delay time is longer than a predetermined delay time. When the path propagation delay time is longer than the predetermined delay time, the detecting circuit produces a detection signal. Responsive to the detection signal, an inhibiting circuit inhibits the first through the N-th mobile stations from using either one of the first primary and the N-th subsidiary time slots in the communication signal.

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First Claim