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.