GSM channel types

GSM channels are help to maintain the GSM network. It also helps GSM mobile phones connect to GSM network and maintain the connection. 

This article are very helpful in GSM network and also to learn more details about the different types of channel used in GSM system and how to work. 

Figure below mention all the channel used in GSM. 

There are two main types of GSM channel : (i) Traffic channel (ii) Control channel


The following logical channels are defined in GSM :

TCH : Traffic channel. 

TCH/F : Full rate traffic channel.

TCH/H : Half rate traffic channel.

BCCH : Broadcast control channel for describing the current control channel structure.
BCCH is a point to multi point channel ( BSS to MS ).

SCH : Synchronization channel for the MS.


FCCH : Frequency correction channel.


CCCH : Common control channel. 

PCH : Paging channel terminating call announcement.

AGCH : Access grant control channel.

RACH : Random access control channel for access requests, response to call announcement, location update etc.

DCCH : Dedicated control channel. 

SACCH : Slow associated control channel for TCH in band signalling for link monitoring.

SDCCH : Standalone dedicated control channel for signalling exchanges during call setup, registration / location updates.

FACCH : Fast associated control channel for time critical signalling over the TCH for handover signalling.

Notes : For more detailed information about this channels click on the respective channel name.