| 摘要 |
When a mobile station makes connections with a plurality of base stations during hand over, the number of the base stations that perform transmission is reduced and a base station that exhibits the best reception quality is cause d to perform transmission, thereby reducing the downstream interference to increase the line capacity. In the mobile station, a reception monitor (406) periodically measures pilot signals transmitted from base stations. Upon occurrence of a soft hand over condition, a speed estimating device (407) estimates the moving speed of the local station at a predetermined time interval on the basis of the reception electric field intensity of the pilot signals. A control unit (408) changes, in accordance with the estimated movi ng speed, both the time length for which to measure the pilot signals transmitt ed from the base stations and an internal threshold value for selecting a base station for transmission during the hand over. In that case, when the moving speed is low, the time length for measuring the pilot signals is shortened a nd the internal threshold value is reduced. When the moving speed is high, the time length for measuring the pilot signals is elongated and the internal threshold value is increased.
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