ations apply: (4.70) (4.71) Xik = bi,3,(k-2B) k=2Bj+1,2Bj+2,...,3i (4.72) k = (M) - 1)Bi + 1, (M - 1)Bi + 2, ..., ,M;Bi. (4.73) The UTRA Physical Layer Design Segmentation of the bit sequence from transport block concatenation transpires when Xi > Z, where the segmented blocks have the same size. If the number of bits input to the segmentation (i.e. Xj) is not a multiple of C (the number of code blocks on TrCHi), we add filler bits (Os) to the beginning of the first block. The specifications in [10] de- fine maximum code block sizes as: convolutional coding: 504 turbo coding: Z = 5114 no channel coding: Z = unlimited From Figure 4.49 and [10] we denote the bit output from code block segmentation, where i is the TrCH number, r is the code block number, and Ki is the number of bits. Then number of code blocks: Ci = [X;/Z], and for the number of bits in each code block and filler bits, the following logic applies: number of bits in each code block number of filler bits: Y=CK - Xi if X 40 and turbo coding is used, then if XZ, then Ki = 40 Ki = =[X;/C;T end if end if If X > Z, then 011k=0 =1,2,...,Y Oi2k= k=1,2,...,K, k=1,2,...,K, end if 4.6.3 Channel Coding The concatenation or segmentation process delivers code blocks to the channel coding block, where i is the TrCH number, r is the code block number, and Ki is the number of bits in each code block. We denote C the number of code blocks on TrCH i, and the encoded bits The UMTS Network and Radio Access Technology where Y is the number of encoded bits. The relation between Oirk and Yirk and between Ki and Y depends on the following channel coding scheme: convolutional coding; turbo coding; and no coding. Table 4.39 illustrate the usage of these schemes and the values of Y in connection with each coding scheme are: convolutional coding with rate 1/2: Y = 2K + 16; rate 1/3: Y = 3K + 24; turbo coding with rate 1/3: Y = 3K + 12; no coding: Y = Ki. Table 4.39 Usage of channel coding scheme and coding rate Type of TrCH Coding scheme Coding rate Convolutional coding 1/3, 1/2