ly symbol repetition to the pilot bit pattern with the half size. Appendix B illustrates the bit pattern for compressed mode with spread reduction and Npilot = 4. STTD encoding for the DPDCH, TPC, and TFCI fields follows the definition in Section 4.3.7.2. For DPCH with SF = 512 the first two bits in each slot, i.e. TPC bits, are not STTD encoded. These bits are transmitted with equal power from the two antennas; however, the remaining four bits are STTD encoded. The UTRA Physical Layer Design 4.3.8.4 Closed Loop Mode Transmit Diversity and Dedicated Channel Pilots Closed loop mode 1 uses orthogonal pilot patterns between the transmit antennas. Table 4.17 defines the pilot patterns used on antenna 1 and Table 4.19 defines pilot patterns used on antenna 2. Figure 4.18 illustrates the two antenna slot structures with the pilot pattern bits shaded in grey. In closed loop mode 2, the same pilot pattern is used on both antennas with bit pattern defined in Table 4.17. Slot i Slot i+1 Antenna 1 NDatal NTFCI NData2 NPilot NDatal NTFCI Data2 Npilot Antenna 2 N Datal NTFCI NData2 N pilot N Datal NTFCI NData2 Pilot Slot i Slot i+1 Antenna 1 NDatal NTFCI NData2 NPilot N Datal NTFCI N Data2 Npilot Antenna 2 N Datal NTFCI NData2 N Pilot N Datal NTFCI NData2 Npilot 1 Closed-loop mode 1 uses structure (a), 2 Closed-loop mode 2 uses structure (b), 3 The grey shading indicates the bit pattern orthogonality. Figure 4.18 Slot structures for downlink dedicated physical channel diversity transmission. 4.3.8.5 The Downlink DPCCH for CPCH Downlink DPCCH for CPCH is a special case of downlink dedicated physical channel of 'slot format # 0' illustrated in the table of Appendix A, where the spreading factor for the DL-DPCCH is 512. Figure 4.19 illustrates the CPCH downlink DPCCH frame structure. The CPCH downlink DPCCH incorporates known pilot bits, TFCI, TPC commands and CPCH Control Commands (CCC). CPCH control commands support CPCH signalling. These commands include Layer 1 control command such as start of message indicator, and higher l