on of TPC is done in the data parts of the traffic burst. Hence the midamble structure and length is not changed. The TPC information is to be trans- mitted directly after the midamble. Figure 4.43 shows the position of the TPC in a traf- fic burst. The UTRA Physical Layer Design For every user the TPC information is to be transmitted once per frame. If the TPC is applied, then it is always transmitted using the first allocated channelization code and the first allocated time slot, according to the order in the higher layer allocation mes- sage. The TPC is spread with the same Spreading Factor (SF) and spreading code as the data parts of the respective physical channel. Specifications in [6] cover time slot for- mats and training sequences for spread bursts. 4.4.3.2 Midamble Transmit Power and Beam-forming/Transmit Diversity When all one-time slot downlink users have a common midamble, this common mid- amble's transmit power has no power offset between the data part and the midamble part of the transmit signal within the given slot. Likewise, transmit power of users with specific midambles does not have power offset between the data parts and the midamble part. In the event of DL beam-forming or Tx diversity, the user who has beam- forming/Tx diversity and a dedicated channel, will get one individual midamble. 4.4.4 Common Physical Channels 4.4.4.1 Primary and Secondary Common Control Physical Channels We map the BCH onto the Primary Common Control Physical Channel (P-CCPCH), and obtain the position (time slot/code) of the P-CCPCH from the Physical Synchroni- zation Channel (PSCH). We also map PCH and FACH onto one or more Secondary Common Control Physical Channels (S-CCPCH). Through the PCH, the FACH adapts itself to different require- ments. Table 4.34 summarizes the key P-CCPCH and S-CCPCH features. Table 4.34 P-CCPCH Features P-CCPCH S-CCPCH Spreading It uses fixed spreading with a It uses fixed spreading with a spread- spreading factor SF = 16 and al- ing factor SF = 16 ways channelization code (k=1) CQ=16 B