| 摘要 |
In a mobile network communication between a base station 2 producing a control signal Sa within an administration area 2 - 1 and at least one mobile phone 1 having a kind of communication system, an alarm apparatus 3 is used for producing a use prohibition alarm, when the one mobile phone is present within a use prohibition area 3 - 1 , to its user. The alarm apparatus 3 and its method of the present invention are for intercepting the control signal within the administration area 2 - 1 and comprises system discriminating means 3 - 2 for discriminating the kind of communication system from a response signal Sb and/or a positioning signal Sc from the mobile phone 1 to produce a discriminated communication system information indicative of the kind of communication system of the mobile phone 1 . In accordance with the discriminated communication system information, said use prohibition alarm is produced.
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