| 摘要 |
PROBLEM TO BE SOLVED: To keep constant the closed loop of a mobile station by starting a closed loop power control algorithm when the normal decoding of a preamble signal is confirmed. SOLUTION: A nominal signal/interference ratio(SIR) threshold and a nominal maximum allowable bit error rate(BER) threshold are provided to a detector 6. Closed loop power control increase is set to a fixed value and the mobile station increases transmission power by 0.1 dB per power control group. When the SIR is smaller than the SIR threshold or the current transmission power is less than maximum transmission power, power control increase is set to increase for 0.1 dB and a power control bit is sent to the mobile station. When the SIR value is larger than the SIR threshold or the current transmission power is more than maximum transmission power, on the other hand, the power control bit is sent to the mobile station and the closed loop power control is not contributed to the increase or decrease of transmission power at the mobile station in average. When a preamble frame is decoded without error, the closed loop power control algorithm is started. |
