| 摘要 |
This invention relates to a transmission power control method and transmission power control apparatus in a mobile communication system. The reception quality of a signal ( 31, 32 a , 32 b , 41 , or 42 ) transmitted from another mobile station ( 51 or 52 ) or base station ( 21 or 22 ) is compared with a predetermined control target value such as a signal-to-interference ratio. The comparison result is used for transmission power control on a remote station. If a frame error is detected in a transmitted signal, the control target value is increased by SIRinc. If no frame error is detected, the control target value is decreased by SIRdec. As SIRdec, the product of a target value of a frame error rate and SIRinc is set. With this operation, when a propagation environment such as multibus or moving speed changes, the control target value for transmission power control is changed within a short period of time, and channel quality is maintained constant, thus realizing desired channel quality.
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