| 摘要 |
PROBLEM TO BE SOLVED: To improve call quality by predicting a base station from which optimum received electric field intensity is obtained among monitored base stations with the values of the latest received electric field intensity and the inclination of the received electric field intensity for respective base stations. SOLUTION: CPU 58 continuously monitors the base station twice at the prescribed interval of about four seconds, for example, and stores received electric field intensity in RAM 58b as time sequential data for respective base station identification numbers. The received electric field intensity of the respective base stations is calculated from time sequential data of the base stations, which are stored for the respective identification numbers. Time sequential data of the base stations, which are stored for the respective identification numbers, are referred to and the base station in an existing radio zone is selected by the latest received electric field intensity in the respective base stations and the change of the received electric field intensity in the respective base stations, which is calculated in a received electric field intensity calculation means. The change of the electric field intensity of the base station against the moving direction of the moving body communication terminal at the time of movement is predicted and the optimum base station is selected.
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