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 Fi radio frames. Following radio frame size equalisation the input bit sequence length is guaranteed to be an integer multiple of Fi.
The input bit sequence is denoted by 
where i is the TrCH number and Xi is the number bits. The Fi output bit sequences per TTI are denoted by 
where ni is the radio frame number in current TTI and Yi is the number of bits per radio frame for TrCH i. The output sequences are defined as follows:
= 
, ni = 1…Fi, k = 1…Yi
where
Yi = (Xi / Fi) is the number of bits per segment.
The ni –th segment is mapped to the ni –th radio frame of the transmission time interval.
The input bit sequence to the radio frame segmentation is denoted by 
, where i is the TrCH number and Ti the number of bits. Hence, xik = dik and Xi = Ti.
The output bit sequence corresponding to radio frame ni is denoted by 
, where i is the TrCH number and Ni is the number of bits. Hence, 
and Ni = Yi.