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How Common Control Channel (CCCH) works in GSM ?

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RACH(Random Access Channel)

  • Uplink only.
  • Used by the MS when making its first access to the Network.
  • The reason for access could be initiation of a call or a page response.

AGCH (Access Grant Channel)

  • Downlink only.
  • Used for acknowledgement of the access attempt sent on RACH.
  • Used by the network to assign a signaling channel upon successful decoding of
  • access bursts.

PCH (Paging Channel)

  • Downlink only.
  • The network will page the MS ,if there is a incoming call or a short Message.
  • It contains the MS identity number, the IMSI or TMSI.
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