Patent ID: 7855964

Claim:
A communication method for a code division multiple access (CDMA) communication system transmitting a transport channel composite including data of a plurality of transport channels between a base station and a communication terminal via a physical channel, said physical channel having a maximum physical rate and rate matching is performed on data of each of said transport channels to change a transmission rate, the method comprising: a first step of determining a maximum value of rate estimators by calculating said rate estimator of respective one of a plurality of said transport channel composites each formed of a combination of said plurality of transport channels by multiplying a rate matching parameter controlling a rate matching ratio of each of said transport channels by the number of bits per radio frame of each of said transport channels; a second step of calculating a ratio of said maximum physical rate to the maximum value of said rate estimators; a third step of calculating said rate matching ratio for each of said transport channels by multiplying the ratio obtained in said second step by said rate matching parameter for said transport channel; a fourth step of calculating a number of bits of each of said transport channels, after the third step of calculating said rate matching ratio, by multiplying said rate matching ratio by a number of bits per radio frame of each of said transport channels before said rate matching is performed, and multiplying a result of the multiplication by a number of radio frames per transmission time interval of the relevant transport channel; a fifth step of calculating a variation between the number of bits of each of said transport channels obtained in said fourth step, after the third step of calculating said rate matching ratio, and the number of bits of the relevant transport channel before said rate matching is performed; and a rate matching step of changing the transmission rate by repeating or puncturing at least some bits of the data of each of said transport channels based on said variation.