[8]. 4.3.5.7.1 Collision Detection(CD) Preamble As in PRACH, the PCPCH CD preamble codes Cc-cd,n,s have complex valued sequences. We define these preamble codes from the preamble scrambling codes Sc-cd,n and a pre- amble signature Csig,s as: Co-dd.n.s (4.32) where we define Sc-cd,n in the sequel and Csig,s in Section 4.3.5.6. The 32768 PCPCH CD preamble-scrambling code originates from the same scrambling code utilized in the CPCH access preamble. We define the nth PCPCH CD access pre- amble scrambling code, where n = 8192,8193,... ,40959, as: (4.33) where Section 4.3.5.1 defines the sequence Clong,1,n When RACH and CPCH share scrambling code resources, RACH preamble scrambling codes will also apply to the CPCH CD preamble. As in the cases above, we divide the 32768 PCPCH scrambling codes into 512 groups with 64 codes each. There exists also a one-to-one correspondence between the group of PCPCH CD preamble scrambling codes in a cell and the primary scrambling code used in the downlink of the cell. The kth PCPCH scrambling code within the cell with downlink primary scrambling code m, = 16,17,...,79 and m= 0,1,2,...,511, corresponds to Sc-cd, n as defined in equation (4.33) with n = 64 x m + k + 8176. When PCPCH and PRACH share scrambling code resources, and the index k is less than 16 the corresponding PRACH formula applies. Otherwise, when the index k greater than or equal to 16, the preceding formulae apply. The CD preamble part of the CPCH access burst carries one of 16 different orthogonal complex signatures identical to the ones utilized by the preamble part of the random access burst [8]. 4.3.6 Uplink Power Control Procedure The FDD mode has unique procedures compared to the TDD. These include fast power control and soft handover procedures. Other procedures are synchronization and ran- dom access. The UTRA Physical Layer Design 4.3.6.1 PRACH and DPCCH/DPDCH Power Control The uplink PRACH message part applies gain factors to manage the control/data part relative power similar to the uplink dedicated physical