= (4.25) where the lowest index corresponds to the chip transmitted first in time and Section 4.3.5.1 defines Clong,n For the short scrambling codes we have (4.26) A total of 512 groups each containing 64 codes comprise the 32768 PCPCH scrambling codes. The group of PCPCH preamble scrambling codes in a cell and the primary The UMTS Network and Radio Access Technology scrambling code used in the downlink of the cell match one-to-one. Sc-msg,n as defined in the preceding paragraphs with n = 64 X m + k + 8176, is the kth PCPCH scrambling code within the cell with downlink primary scrambling code m, where k = =16,17,...,79 and m = 0,1,2,...,511 [8]. 4.3.5.5 Scrambling Code in the PCPCH Power Control Preamble The PCPCH power control preamble uses the same scrambling code as the PCPCH message part (Section 4.3.2.1), where the phase of the scrambling code is such that the end of the code aligns with the frame boundary at the end of the power control pream- 4.3.5.6 PRACH Preamble Codes Complex valued sequence constitutes the random access preamble code Cpre,n,* It origi- nates from a preamble scrambling code Sr-pre,n and a preamble signature Csig,s as: )123495 = (4.27) where k = 0 corresponds to the chip transmitted first in time and we define Sr-pre,n and Csig,s next. A total of 8192 PRACH preamble part scrambling codes result from the long scrambling sequences. We define the nth preamble scrambling code, n = 0,1,...,8191, (4.28) where Section 4.3.5.1 defines the sequence Clong,1,n As for the PCPCH, we divide the 8192 PRACH preamble scrambling codes in 512 groups with 16 codes in each. And again as in the earlier scrambling codes, we have one-to-one correspondence between the group of PRACH preamble scrambling codes in a cell and the primary scrambling code used in the downlink of the cell. Sr-pre,n(i) as de- fined in equation (4.28) with n = 16xm + k, represents the kth PRACH preamble scrambling code within the cell with downlink primary scrambling code m, k = 0,1,2, 15 and m = 0,1,2,...,511. The preamble signature S h