P-CCPCH – Primary Common Control Physical Channel
There is only one Primary Common Control Physical Channel within a cell, and it is used to carry synchronization and broadcast information for users. The frame structure of the Primary CCPCH differs from the downlink DPCH (Dedicated Physical Channel) in that no TPC (Transmit Power Control) commands, no TFCI (Transport Format Combination Indicator) and no pilot bits are transmitted. The Primary CCPCH is not transmitted during the first 256 chips of each slot. Instead, Primary SCH (Synchronization Channel) and Secondary SCH are transmitted during this period, the remainder being used for broadcast messages.
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