| 摘要 |
In a mobile station, a mobile station location determining receiving unit (103) of a mobile station measures the location of the mobile station, based on a GPS signal from a GPS antenna (101) or based on location information from an external interface (102). A base station database (109), holding therein base station information about the locations of base stations, the service areas and so on in the cellular mobile communication system, collates the information on the measured current location with the base station information, and performs no measurement of vicinity cell field intensity for handoff when the mobile station is within a predetermined distance from the location of the base station currently communicating therewith, while performing the measurement of the vicinity cell field intensity otherwise and making a judgment. In the case of a multimode mobile station capable of communicating with different multiple cellular mobile communication systems, the field intensity measurement for handoff between the different systems is performed only when the mobile station is located in a border area there between.
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