| 摘要 |
PROBLEM TO BE SOLVED: To provide a mobile communication system capable of informing the possibility that a mobile station withdraws from a communicable area on a base station side and a mobile station side. SOLUTION: A communication area withdrawal prediction means 23 analyzes the change of an outgoing signal level recorded by an outgoing signal level monitoring means 22 and predicts the possibility of withdrawing from the communicable area eventually when the mobile station 2a advances while keeping a present advancing direction from a level lowering amount and lowering time, etc. An alarm generation means 25 receives the predicted result and generates an alarm by display and sound. In the meantime, an alarm informing means 24 receives the communicable area withdrawal predicted result and makes the alarm of communicable area withdrawal possibility presence be transmitted from a radio part 21 to a base station 1 as outgoing signals 4.
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