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common control channel (mobile communications) (CCCH)

Common Control Channels (CCCH) are organizational channels in GSM networks that are used to establish connections. The CCCH channels provide the mobile station with information about the network. The mobile station can request the allocation of a signaling channel via a CCCH channel.

Each CCCH channel is a simplex channel either in the downlink from the radio base station( BTS) to the mobile station or in the uplink in the reverse direction. The CCCH channels are packet-switched channels over which the short message service( SMS) also takes place. The transmission speed for the short message service is 400 bps to 500 bps. The connection is activated via a special random access procedure, Slotted Aloha Random Access.

Channel distribution of the GSM channels

Channel distribution of the GSM channels

The Common Control Channel (CCCH) can be divided into three logical subchannels: The Random Access Channel( RACH), which operates on the Slotted Aloha principle for random accesses, the Access Grant Channel( AGCH), via which successful accesses are confirmed, and the Paging Channel( PCH), which transmits selective calls for locating cellphones within a specific radio cell.

Informations:
Englisch: common control channel (mobile communications) - CCCH
Updated at: 01.02.2012
#Words: 173
Links: global system for mobile communications (GSM), information, network, allocation, channel
Translations: DE
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