SYSTEM FOR DECIDING TRAVEL OF MOBILE STATION AMONG RADIO ZONES

PURPOSE:To improve the accuracy of a shifting decision between zones and to prevent the increase of the energy consumption by deciding the shifting of radio zones by the difference between the receiving level of plural station simultaneous transmitting parts and the receiving level of an individual transmitting part. CONSTITUTION:For the decision of the radio inter-zone shifting of mobile stations R1-RN at a system to adopt the simultaneous individual sequential transmission of plural stations, the receiving level of plural station simultaneous transmitting parts of an incoming control channel to receive and the receiving level of the individually sequentially transmitting time slot of a radio base station 1 to decide that the mobile stations R1-RN are present are compared, and when the difference becomes a certain value or above, it is decided that the inter-zone shifting is executed. Thus, since the decision is executed by the relative value of the receiving level in the time slot to execute the simultaneous transmission between plural stations, the leakage of the zone shifting decision is prevented and the waste of the energy consumption can be saved.