Answer / chitesh shankar

there are 4 type of channels:

1 traffic channel
2 broadcast channel
3 common control channel
4 dedicated channel

1) Traffic Channel-
It carries speech and data
types:
> TCH/F (traffic channel full rate)
> TCH/H (traffic channel half rate)
> TCH/EFR (traffic channel enhanced full rate)

2) Broadcast Channel:-
it helps the mobile station to orient themselves in the
mobile radio network.
types:
> BCCH (Broadcast Control Channel)
> FCCH (Frequency Control Channel)
> SCH (Synchronization Channle)
> CBCH (Cell Broadcast Channel)

3)Common Control Channel:-
It operates in one direction of transmission, either in
uplink or downlink.
types:
> PCH (Paging Channel)
> AGCH (Access Grant Channel)
> RACH (Random Access Channel)

4) Dedicated Control Channel:-
It is used for signalling between the BTS and a certain
Mobile Station.
types:
> SACCH (Slow Associated Control Channel)
> FACCH (Fast Associated Control Channel)
> SDCCH (Stand-alone Dedicated Control Channel)

Answer / felix

basicallly the are two types of channel in GSM

physical and logical types of channels

Answer / srikar

there r 4 type of channels

1 traffic channel
2 common control channel
3 brodcast channel
4 dedicated channel

Answer / dhiraj

There are only two types of Channels

1. Traffic channels
2. Signalling Channels

Answer / m.arul prakash

There are in all 12 types of logical channels in GSM, of which two are used for traffic; nine used for “control signalling” and one used for message distribution (CBCH).

These 9 control channels are subdivided into 3 groups
Broadcast Channel (BCH, Downlink Only): FCCH, SCH and BCCH.
Common Control Channel (CCCH): PCH, RACH and AGCH.
Dedicated Control Channel (DCCH): SDCCH, SACCH and FACCH.

Answer / ramneet singh

There are two types of channels in gsm:-
1.TRAFFIC
2.CONTROL

Answer / ayesha pathan

GSM Logical channels and their functions
As shown in the figure there are two main types of channels in the GSM. Traffic channels and control channels. Different bursts are mapped to these channels uniquely as per GSM TECHNICAL SPECIFICATION 05.02.

Traffic channels carry speech or data. There are two main categories here, Full rate (13 kpbs) and Half rate.

Control channels used to for control/command/signaling. Control channels are divided into three categories.
Category 1: Broadcast channels
As the name suggests they are point-to-multipoint and downlink only channels.
FCCH: Frequency correction control channel, this is transmitted by BTS to MS. This helps MS tune its local oscillator to exact RF carrier frequency of the BTS cell. All zero sequences are transmitted here which will produce fixed tone at the output of GMSK modulator. The frequency value will be about 67.7075 KHz.
SCH:synchronization channel, this carry BSIC(Base transceiver station identity code) and Frame number which helps MS tune to specific (Frequency,Ts) physical slot on TDMA frame in GSM network.
BCCH: Broadcast control channel, carry CGI,MNC,MCC which is received by MS. It is compared with SIM information, once varified OK connection is established with the network.
Category 2: Common Control channels
They are point-to-multipoint and downlink only channels except RACH which is used in uplink.
PCH:Paging channel,When someone is calling mobile phone, this channel sent information on downlink to alert called mobile phone.This is known as mobile phone terminated call.

RACH:Random Access channel, used in mobile originated call. When mobile wants to call some other mobile phone, control information is sent on this channel.
AGCH:Access Grant Channel,transmitted by BTS to MS once network approves request of mobile by RACH.
CBCH:Cell Broadcast channel, Used to carry the short message service cell broadcast.
Category 3: Dedicated Control channels
They are bidirectional and point-to-point Channels.
SDCCH: Stand alone dedicated control channel, used for call setup.
SACCH: Slow associated control channel, is used for control and supervisory signals associated with the traffic channels.
FACCH: Fast associated control channel, is used for control requirements such as

Answer / aukif anwar

There are two types of GSM logical channels:
1:traffic channels (TCHs)
2:control channels (CCHs)

Answer / ayesha pathan

Two main channel are physics channel and logical channel
Logical channel are classified in two types these are 1.traffic channel(full rate ,half rate)
2.signaling
A) broadcast channel
B) common control channel
C) dedicated channel

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