Patent ID: 6501958
Filing Date: 2002-12-31
Classification: H04W

Abstract:
A method for improving a call quality and a subscriber capacity using an erasure indicator bit (EIB) as a forward power control signal in a CDMA system of the type having a mobile station and at least one base station, wherein the power control parameter messages of said base station are predetermined and the transmission power of said base station is controlled in accordance with said power control parameter messages, said power control parameter messages include a nominal_gain message for indicating an initial gain of the transmission power of said base station when a call is established between said base station and said mobile station, a max_tx_gain message for indicating a maximum gain of the transmission power of said base station, a min_tx_gain message for indicating a minimum gain of the transmission power of said base station, and a periodic_frame_count message for indicating a reducing rate cycle of a number of frames over which said mobile station is to count frame errors, said method comprising the steps of:setting the value of said nominal_gain message not substantially less than 100; setting the value of said max_tx_gain message not substantially less than 127; setting the value of said min_tx_gain message not substantially greater than 35; and, setting the value of said periodic_frame_count message not substantially greater than 20 if the gain of a traffic channel is greater than or equal to a slow-down level, wherein said slow-down level corresponds to a level being at a bottom one-third between said max_tx_gain and said min_tx_gain, wherein setting said nominal_gain of said power control parameter at said value is determined by following equation: EbNo=EcIo+P.G+10&it;â€ƒ&it;log&af;[(GT)2(GP)2],wherein EbNoâ€ƒrepresents a value of signal-to-noise ratio indicating a signal strength of a traffic channel, EcIoâ€ƒrepresents a value of signal-to-noise ratio of a pilot signal strength, P.G represents a value of a power gain, GP represents a value of a pilot signal gain, and GT represents the nominal gain, wherein said nominal_gain is set so that said mobile station can produce said signal strength at about 5 dB and keeping said pilot signal strength at about âˆ’14 dB.