Patent ID: 6377555
Filing Date: 2002-04-23
Classification: H04B,H04W

Abstract:
A method for adaptively determining, in a base station transmitter, an optimal amount of power for every forward link channel in a code division multiple access (CDMA) system using orthogonally multiplexed channels on a forward link, said method comprising the steps of:providing a system of equations in which forward link energy-to-noise density requirements are modeled for every signaling channel of said CDMA system and for a traffic channel directed to an edge of a cell in said CDMA system, wherein each of said equations includes a channel power variable; solving said system of equations to determine the channel power for each of said signaling channels and said traffic channel; and controlling a necessary channel gain for each of said signaling channels and said traffic channel utilizing the solved system of equations, wherein said system of equations modeling the forward link energy-to-noise density requirements for every signaling channel of said CDMA system and system traffic channel directed to an edge of a cell in said CDMA system considers the following variables: desired energy-to-noise density ratio values for each channel type, spread spectrum processing gains for each channel type, a net loss experienced by a base station transmitter output signal when proceeding from an amplifier output of said base station to an input terminal of a mobile receiver at the cell edge in said CDMA system, thermal noise power at the mobile receiver, a number of active CDMA paging channels, an average forward link traffic channel voice activity factor, and a forward link same-cell interference factor.