| 摘要 |
In a simplified portable telephone system having a small radius of a radio zone, a channel switching failure during high-speed movement or an instantaneous disconnection at the time of switching often occurs. Judgment is made upon whether a mobile station moves at high speed or low speed based on a degree of reduction in an electric field intensity of a channel currently used for a telephone call, and a radio base station having an electric field intensity, which is above a specified value and shows a largest increases is selected froze surrounding radio base stations which can be a target of channel switching during high-speed movement, thereby performing channel switching.
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