g Channel Downlink transport channel transmitted always over the entire cell, used to carry control in- formation to a mobile station when the system does not know the location cell of the mobile station. In the FDD mode transmission of the PCH is associated with the transmission of physical-layer generated paging indicators, to support efficient sleep-mode procedures. RACH - Random Access Channel RACH - Random Access Channel Uplink transport channel, always received from the entire cell, used to carry control informa- tion from the mobile station. In FDD, the RACH is characterized by a collision risk and by using open loop power control for transmission. In TDD it may also carry short user packets. The UTRA Physical Layer Design CPCH - Common Packet Channel USCH - Uplink Shared Channel Uplink transport channel associated with a dedi- Uplink transport channel shared by several cated channel on the downlink, which provides UEs carrying dedicated control or traffic power control and CPCH control commands data. (e.g. emergency stop). It is characterized by initial collision risk and by using inner loop power control for transmission. DSCH - Downlink Shared Channel DSCH - Downlink Shared Channel Downlink transport channel shared by several UEs carrying dedicated control or traffic data. In FDD it is associated with one or several downlink DCH(s). It may be transmitted over the entire cell or over only a part of the cell using e.g. beam-forming antennas. Both FDD and TDD have a similar number of transport channels; however, the FDD mode does not have an Uplink Shared Channel (USCH) and the TDD mode does not have a Common Packet Channel (CPCH). The CPCH transport channel in FDD performs essential power control commands, which may not be required in TDD. Likewise, the USCH transport channel performs essential commands in TDD, which may not be required in FDD. CONFIGURATION OF FDD PHYSICAL CHANNELS Physical channels in FDD inherit primarily a layered structure of radio frames and time slots. A radio frame is a processing