Adaptive power control in wideband CDMA cellular systems (WCDMA) and methods of operation
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United States of America Patent
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-
Feb 10, 2004
Grant Date -
N/A
app pub date -
Oct 7, 1999
filing date -
Oct 26, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A WCDMA system includes a Base Station (BS) transmitter, or forward transmitter and a pilot channel that transmits control signals between the BS and a Mobile Station (MS) to reconfigure their transmitter/receiver. Reconfiguration is performed according to the prediction of the channel attenuation and the threshold set at the BS or MS based on its channel power probability density function separated into three distinct equal probable regions. In one embodiment, Seamless Rate Change (SRC)/Transmitter Power Control (TPC) logic uses the predicted channel attenuation to signal both the transmitter and the receiver in a channel to reconfigure their transmit power level according to the power density function (pdf) of the channel power and threshold level. A transmission rate is reduced when the power level is below the threshold and increased when the channel power is above threshold. The pilot channel is used to signal the mobile station and the base station.
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