 Channel Bits/ Bits/ Ndata Npilot NTFCI format rate (kbps) symbol rate frame (ksps) 19200 19200 * If TFCI bits are not used, then DTX shall be used in TFCI field. We can use the shadowed part of the pilot symbol pattern illustrated in Table 4.23 as frame synchronization words. Symbol patterns other than the frame synchronization word contain '11'. The transmission order of the two-bit pair representing an I/Q pair of QPSK modulation illustrated in Table 4.23 goes from left to right. Table 4.23 Pilot Symbol Pattern Slot # Npilot = 8 Npilot = 16 Symb. # The UMTS Network and Radio Access Technology When a slot formats uses TFCI bits, its value in each radio frame corresponds to a cer- tain transport format combination of the FACHs and/or PCHs in actual use, which is (re)negotiated at each FACH/PCH addition/removal. 4.3.9.3.1 STTD Encoding the S-CCPCH structure If the UTRAN perceives antenna diversity and we transmit S-CCPCH using open loop transmit diversity, STTD encoding applies to the S-CCPCH data symbols. Table 4.24 shows the pilot symbol pattern for antenna 2. Table 4.24 Antenna 2 Pilot Symbol Pattern for STTD Encoding in the S-CCPCH Slot # Npilot = 8 Npilot = 16 Symbol # 4.3.9.4 Synchronization Channel (SCH) The Synchronization Channel (SCH) as a downlink signal for cell search consists of two sub-channels, i.e. the primary and secondary SCH. These channels shown in Figure 4.24 have 10 ms radio frames divided into 15 slots, each having 2560 chips length. The primary SCH consists of a modulated code of length 256 chips, the Primary Syn- chronization Code (PSC) denoted Cp in Figure 4.24, transmitted once every slot. The PSC is the same for every cell in the system. The secondary SCH consists of repeatedly transmitting a length 15 sequence of modu- lated codes of length 256 chips, the Secondary Synchronization Codes (SSC), transmit- ted in parallel with the primary SCH. The SSC is denoted csi,k in Figure 4.24, where i = 0,1,...,63 is the number of the scrambling code group, and k = 0,1 ...,14 is the slot number. 