P-SCH - Primary Synchronization Channel

The UMTS Primary SCH (Synchronization Channel) is a downlink signal used for cell search. The SCH consists of two sub channels, the Primary and Secondary SCH. The 10ms radio frames of the SCH are divided into 15 slots, each of length 2560chips. The Primary SCH consists of a modulated code of length 256chips, and is transmitted once every slot.


  • Fully interactive 3GPP based network map
  • Narrated call flows
  • Detailed network procedures

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