terleaving details. 4.6.6 Radio Frame Segmentation When the TTI is longer than 10 ms, the input bit sequence get segmented and mapped onto consecutive F radio frames. Following rate matching in the DL and radio frame size equalization in the UL, we warrant that the input bit sequence length is an integer multiple of Fi- We denote this input bit sequence by where i is the TrCH number and X is the number bits. Likewise, we denote the Fi out- put bit sequences per TTI by The UTRA Physical Layer Design where Ni is the radio frame number in the current TTI and Y is the number of bits per radio frame for TrCH i. Then we define the output sequence as: n,=1,...,F,, k = 1,...,Y, (4.77) where Y = (X{/Fj) is the number of bits per segment. The nith segment is mapped to the nith radio frame of the transmission time interval. 4.6.6.1 Input-Output Relationship of the Radio Frame Segmentation Block in Uplink We denote the input bit sequence to the radio frame segmentation by where i is the TrCH number and Ti the number of bits. Thus, Xik = dik and X = T; Like- wise, we denote the output bit sequence corresponding to radio frame Ni by where i is the TrCH number and N is the number of bits. Thus, 4.6.6.2 Input-Output Relationship of Radio Frame Segmentation Block in Downlink As in the preceding section, we denote the bits input to the radio frame segmentation by where i is the TrCH number and Qi the number of bits. Hence, Xik = 9ik and X = Qi. Again, we denote the output bit sequence corresponding to radio frame Ni is by where i is the TrCH number and V is the number of bits. Then, 4.6.7 Rate Matching By rate matching we mean the repetition or puncturing of bits on a transport channel based on attributes assigned by higher layers. An attribute is semi-static and can only get changed through higher layer signalling. The rate matching attribute assignment occurs after the calculation of the number of bits to be repeated or punctured. The number of bits on a transport channel can vary between different TTIs. In the DL the transmissi