## 4.2.6 Radio frame segmentation

25.2223GPPMultiplexing and channel coding (TDD)Release 17TS

When the transmission time interval is longer than 10 ms, the input bit sequence is segmented and mapped onto consecutive *F _{i}* radio frames. Following radio frame size equalisation the input bit sequence length is guaranteed to be an integer multiple of

*F*.

_{i}The input bit sequence is denoted by where *i* is the TrCH number and *X _{i}* is the number bits. The

*F*output bit sequences per TTI are denoted by where

_{i}*n*is the radio frame number in current TTI and

_{i}*Y*is the number of bits per radio frame for TrCH

_{i}*i*. The output sequences are defined as follows:

= , *n _{i}* = 1…

*F*,

_{i}*k*= 1…

*Y*

_{i}where

*Y _{i}* = (

*X*/

_{i}*F*) is the number of bits per segment.

_{i}The *n _{i}* –th segment is mapped to the

*n*–th radio frame of the transmission time interval.

_{i}The input bit sequence to the radio frame segmentation is denoted by , where *i* is the TrCH number and *T _{i}* the number of bits. Hence,

*x*and

_{ik}= d_{ik}*X*.

_{i}= T_{i}The output bit sequence corresponding to radio frame *n _{i}* is denoted by , where

*i*is the TrCH number and

*N*is the number of bits. Hence, and

_{i}*N*.

_{i}= Y_{i}