g minimum integer R2 such that: U S R2C2. The bits input to the 2nd interleaving are written into the R2 X C2 rectangular matrix row by row. (4.91) Perform the inter-column permutation based on the pattern {P2(j)} (j = ....,C2-1) which Table 4.39 illustrates, and where P2(j) is the original column position of the jth permutated column. After permutation of the columns, the bits are denoted by Ypk [10]. (4.92) YPR2 Yp,(2R2) Yp,(3R2) Yp,(30R2) The output of the 2nd interleaving corresponds to the bit sequence read out column by column from the inter-column permuted R2 X C2 matrix. We prune the output by delet- ing bits that were not present in the input bit sequence, i.e. bits Ypk that correspond to bits upk with k > U. We denote the bits after 2nd interleaving by where Vp1 corresponds to the bit Ypk with smallest index k after pruning, Vp2 to the bit Ypk with second smallest index k after pruning, and SO on. Table 4.40 Inter-column Permutations [10] Number of column C2 Inter-column permutation pattern {0, 20, 10, 5, 15, 25, 3, 13, 23, 8, 18, 28, 1, 11, 21, 6, 16, 26, 4, 14, 24, 19, 9, 29, 12, 2, 7, 22, 27, 17} 4.6.12 Physical Channel Mapping Specifications in [1] and the earlier sections in this chapter define the PhCH for both uplink and downlink. We denote the input bits to the physical channel mapping by VPU , where p is the PhCH number and U is the number of bits in one radio frame for one PhCH. We map the bits Vpk to the PhCHs SO that the bits for each PhCH are transmitted over the air in ascending order with respect to k. In the compressed mode, no bits get mapped to certain slots of the PhCH(s). Likewise, if Nfirst + TGL 15, no bits get mapped to slots Nfirst to Nlast If Nfirst + TGL > 15, i.e. the transmission gap spans two consecutive radio frames, the mapping is as follows: The UTRA Physical Layer Design in the first radio frame, no bits are mapped to slots Nfirst Nfirst+1 Nfirst+2, 14. in the second radio frame, no bits are mapped to the slots 0, ..,Neat We describe TGL, Nfirst, and N 1 ast while presen