| 摘要 |
It is an object of the present invention to provide a wireless communication system, which ensures that communication can be maintained in an excellent status although a mobile wireless station may be moved in a service area. A CPU ( 210 ) of a mobile wireless station ( 2 ) in process of transmission is operated to causes a receiving circuit ( 202 ) to periodically notify the CPU ( 210 ) of the electric field intensity of a received radio wave. When the electric field intensity of the received radio wave becomes lower than a predetermined value, the CPU ( 210 ) is operated to judge the distance from a base station ( 1 ), with which the mobile wireless station ( 2 ) is currently communicating, is increased, and the CPU ( 210 ) is operated to control the receiving circuit ( 202 ) to receive radio waves on transmission frequencies of base stations ( 1 ) other than the base station ( 1 ) and detect the electric field intensities of the received radio waves. Then, the CPU ( 210 ) is operated to control the receiving circuit ( 202 ) to receive the radio wave of the base station ( 1 ) which is the strongest in the electric field intensity of the radio wave among the base stations ( 1 ). When the data of a DTMF signal of the radio wave is indicative of "transmission permitted", the CPU ( 210 ) is operated to control the receiving circuit ( 202 ) to switch to the base station ( 1 ) for communication. When, on the other hand, the data of the DTMF signal of the radio wave is indicative of "transmission inhibited", the CPU ( 210 ) is operated to control the receiving circuit ( 202 ) to receive radio waves of the base stations in order of decreasing electric field intensity of the radio wave, and switch to the base station ( 1 ) which transmits DTMF signal having data indicative of "transmission permitted".
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