Communication method and apparatus and base station

1. 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.

2. The communication method according to claim 1 , further comprising:

a transmitting step of transmitting, by said base station, the data after the rate matching via said physical channel; and

a receiving step of receiving, by said communication terminal, the data transmitted from said base station.

3. A communication apparatus in 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 corresponding to the number of available bits in one radio frame, and changing a transmission rate by repeating or puncturing some bits of the data of each of said transport channels, said communication apparatus comprising:

rate estimator determining means for determining a maximum value of rate estimators corresponding to a plurality of transport channel composites, each format of whose differs from each other, said transport channel being composed of a plurality of transport channels;

rate matching ratio determining means for determining a rate matching ratio of each of said transport channels based on a ratio of said maximum physical rate to the maximum value of said rate estimators and a rate matching parameter determined for said transport channel;

variation determining means for determining a number of bits per transmission time interval of each of said transport channels based on said rate matching ratio and a number of bits per radio frame of each of said transport channels after said rate matching ratio determining means has determined the rate matching ratio and before the rate matching, and calculating a variation based on the number of bits per transmission time interval after said rate matching ratio determining means has determined the rate matching ratio, and the number of bits of the relevant transport channel before the rate matching; and

rate matching means for repeating or puncturing some bits of the data of each of said transport channels based on said variation.

4. A base station in a code division multiple access (CDMA) communication system transmitting a transport channel composite including data of a plurality of transport channels via a physical channel, said physical channel having a maximum physical rate, the base station performing rate matching on data of each of said transport channels to change a transmission rate by repeating or puncturing some bits of the data of each of said transport channels, said base station comprising:

first means for 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;

second means for calculating a ratio of said maximum physical rate to the maximum value of said rate estimators;

third means for calculating said rate matching ratio for each of said transport channels by multiplying the ratio obtained by said second means by said rate matching parameter for said transport channel;

fourth means for calculating a number of bits of each of said transport channels by multiplying said rate matching ratio by a number of bits per radio frame of each of said transport channels after said third means for calculating said rate matching ratio has determined the rate matching ratio, and multiplying a result of the multiplication by a number of radio frames per transmission time interval of the relevant transport channel;

fifth means for calculating a variation between the number of bits of each of said transport channels obtained by said fourth means after said third means for calculating said rate matching ratio has determined the rate matching ratio, and the number of bits of the relevant transport channel per said transmission time interval before the rate matching; and

rate matching means for 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.

5. A communication method of a telecommunication 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 and performing rate matching on data of each of said transport channels to change a transmission rate, said physical channel having a maximum physical rate, the method comprising:

a determining step of calculating a variation between a number of bits of each of said transport channels after the rate matching and a number of bits of each of said transport channels before the rate matching, based on a first parameter relative to a rate matching ratio of each of said transport channels, a second parameter indicating said maximum physical rate corresponding to said transport channel composite, and a third parameter indicating a rate estimator corresponding to said transport channel composite;

a rate matching step of transforming a number of bits of said transport channel before the rate matching into a number of bits of said transport channel after the rate matching by repeating or puncturing at least some bits of each of said transport channels before the rate matching, based on said variation calculated in the determining step;

a transmitting step of transmitting, by said base station, the data transformed in the rate matching step via said physical channel; and

a receiving step of receiving, by said communication terminal, the data transmitted in the transmitting step.

6. The communication method according to claim 5 , further comprising:

a calculating step to calculate said rate estimator using said first parameter.

7. A base station in a telecommunication 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 and performing rate matching on data of each of said transport channels to change a transmission rate,

said physical channel having a maximum physical rate, the base station comprising:

determining means for calculating a variation between a number of bits of each of said transport channels after the rate matching and a number of bits of each of said transport channels before the rate matching, based on a first parameter relative to a rate matching ratio of each of said transport channels, a second parameter indicating said maximum physical rate corresponding to said transport channel composite, and a third parameter indicating a rate estimator corresponding to said transport channel composite;

a rate matching means for transforming a number of bits of said transport channel before the rate matching into a number of bits of said transport channel after the rate matching by repeating or puncturing at least some bits of each of said transport channels before the rate matching, based on said variation calculated by the determining means; and

a transmitting means, in said base station, for transmitting the data transformed by the rate matching means via said physical channel.

8. The base station according to claim 7 , wherein said rate estimator is calculated using said first parameter.