| 摘要 |
PROBLEM TO BE SOLVED: To provide a mobile communication system, a base station equipment, a mobile station equipment and a service area-leave prevention alarming method in which communication is not interrupted because a mobile station in communication with a base station at the outermost point of a service area moves outside of the service area. SOLUTION: A base station equipment is provided with an antenna 11, an RF section 12, a modem section 13 including a QPSK demodulator 13a and a QPSK modulator 13b, a channel codec section 14, a vice codec section 15, a power supply section 16, a control means control section 17 and a subscriber circuit connection section 18. The base station equipment transmits, to the mobile station, service area information denoting whether or not the base station is located at an outermost circumferential area of all the service areas, and also an electric field level information to generate service area alarm used for discriminating zone-leaving from the service area specific to the base station.
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