The rate matching step in above figure is essentially implemented by repetition or puncturing, SEIMENS has proposed an algorithm to ETSI, to obtain a non-integer punture/repetition ratio referenced SM/G2/UMTS-L1/Tdoc428/98 and it is given as follows. This algorithm is used as a standard approach for Rate Matching.
[[Image:cdma21.jpg|thumb|600px700px|center|Rate matching algorithm by SEIMENS]]
The above algorithm avoids puncturing consecutive bits when operating in the puncturing mode. In the repetition mode, the repetition bits follow the bits which they repeat. [[Interleaving]] is an essential step in a communication systems. In the current scenario of repetition,when interleaving is executed after rate matching it would space the repeated bits apart. While Puncturing, if the interleaver precedes the rate matching it may puncture consecutive bits of the channel encoder which were dispersed by interleaving. Hence it is always preffered to have the rate matching step as close as possible to the Channel Encoder