Patent ID: 7864680

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 calculating a ratio of said maximum physical rate to a maximum value of estimated transport channel composite rates; a second step of calculating a rate matching ratio for each of said transport channels by multiplying the ratio obtained in said first step by a rate matching parameter for said transport channel, said rate matching parameter controlling said rate matching ratio for said transport channel; a third step of calculating a number of bits of each of said transport channels after said rate matching by multiplying said rate matching ratio by a number of bits before said rate matching per radio frame of each of said transport channels and multiplying a result of the multiplication by a number of radio frames per transmission time interval of the relevant transport channel; a fourth step of calculating a variation between the number of bits of each of said transport channels after said rate matching obtained in said third step and the number of bits of the relevant transport channel before the rate matching; and a fifth step of correcting said variation using an intermediate variation for at least one of said transport channels, in the case that a total sum of the number of bits per radio frame after said rate matching for said plurality of transport channels exceeds said maximum physical rate, said intermediate variation being calculated based on said rate matching parameter and the number of bits per radio frame before said rate matching for at least one of said transport channels.