4.3) Con.2(#+1)2(n+1).2 C oh.2".2"-1 The UTRA Physical Layer Design The leftmost value in each channelization code word corresponds to the chip transmit- ted first in time. 4.3.4.1 DPCCH/DPDCH Code Allocation According to [8] for the DPCCH and DPDCHs the following applies: the DPCCH is always a code CC = Cch,256,0 as spread; and when we transmit only one DPDCH, the DPDCH1 has code cd,1 = Cch,SF,k as spread, where SF is the spreading factor of DPDCH1 and k = SF/4. However, when we transmit more than one DPDCH, all DPDCHs have spreading factors equal to 4. The DPDCHn is spread by the code = Cch,4,k , where =1ifne{1,2},k=3ifne{3,4 4}, and if n E {5, 6}. 4.3.4.2 PRACH Message Part Code Allocation The preamble signature S, , 0  s  15, points to one of the 16 nodes in the code tree that corresponds to channelization codes of length 16. To spread the message part we use the sub-tree below a specified node, while to spread the control part we use the chan- nelization code CC with SF = 256 in the lowest branch of the sub-tree, i.e. CC = Cch,256,m where m = 16xs+15. The data part uses any of the channelization codes from spread- ing factor 32 to 256 in the upper-most branch of the sub-tree. More exactly, we spread the data part by channelization code Cd=Cch,SF,m> SF is the data part spreading factor and m = SF x s/16 [8]. 4.3.4.3 PCPCH Message Part Code Allocation For the control part and data part the following applies: the control part has always code cc=Cch,256,0 as spread; and the data part has code = Cch,SF,k as spread, where SF is the spreading factor of the data part and k = SF/4. The data part may use the code from spreading factor 4 to 256, and a UE can increase SF during a message transmission on frame by frame basis [8]. Finally, the same channelization code of the message control part applies to the PCPCH power control preamble. 4.3.5 Uplink Scrambling Codes All uplink physical channels use a complex-valued scrambling code. While either long or short scrambling codes apply to the DPCCH/DPDCH, to the PRACH and P