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.