TCH in GSM
TCH stands for a traffic channel in GSM.
This article describes the GSM traffic channel. Traffic channel carries digitally encoded user data or user
speech on the forward and reverse link.
TCH support two types of information rates, they are

Full rate ( TCH/F )

Half rate ( TCH/H )
TCH is a group of 26 consecutive TDMA frame, called multi-frame of the 26 TDMA frames, 24 are used as
TCH frames, one frame (thirteen ) is for SACCH and 26th is the unused or idle frame.
TCH data transmitted in 26 consecutive frames
1. Full rate TCH (TCH/F)
Full rate speech channel (TCH/FS) - At 13 Kbps the full rate speech channel is digitized. After channel
coding, full rate speech channel carries 22.8 Kbps.
Full
rate data
channel (TCH/F9.6), Full
rate
data
channel (TCH/F4.8), Full
rate
data
channel (TCH/F2.4) channel carries the data at the speed of 9.6 Kbps, 4.8Kbps, 2.4Kbps respectively.
After channel coding is applied is converted to data transferred rate at up to 22.8 Kbps.
2. Half rate TCH (TCH/H)
Half rate speech channel (TCH/HS) - At 6.5 Kbps the half rate speech channel is digitized. After channel
coding, half rate speech channel carries up to 11.4 Kbps.
Hull rate data channel ( TCH/H4.8), Full rate data channel (TCH/H2.4) channels carry the data at the speed
of 4.8 Kbps, 2.4 Kbps respectively.
C2 General
After channel coding is applied is converted to data transferred rate at up to 11.4 Kbps.
Explore more information:
1.
CCCH in GSM
2.
BCCH in GSM
3.
AGCH in GSM
4.
FCCH in GSM
5.
RACH in GSM
6.
DCCH in GSM
7.
SACCH in GSM
8.
SDCCH in GSM
9.
FACCH in GSM
TCH stands for a traffic channel in GSM.
This article describes the GSM traffic channel. Traffic channel carries digitally encoded user data or user
speech on the forward and reverse link.
TCH support two types of information rates, they are

Full rate ( TCH/F )

Half rate ( TCH/H )
TCH is a group of 26 consecutive TDMA frame, called multi-frame of the 26 TDMA frames, 24 are used as
TCH frames, one frame (thirteen ) is for SACCH and 26th is the unused or idle frame.
TCH data transmitted in 26 consecutive frames
1. Full rate TCH (TCH/F)
C2 General
Full rate speech channel (TCH/FS) - At 13 Kbps the full rate speech channel is digitized. After channel
coding, full rate speech channel carries 22.8 Kbps.
Full
rate data
channel (TCH/F9.6), Full
rate
data
channel (TCH/F4.8), Full
rate
data
channel (TCH/F2.4) channel carries the data at the speed of 9.6 Kbps, 4.8Kbps, 2.4Kbps respectively.
After channel coding is applied is converted to data transferred rate at up to 22.8 Kbps.
2. Half rate TCH (TCH/H)
Half rate speech channel (TCH/HS) - At 6.5 Kbps the half rate speech channel is digitized. After channel
coding, half rate speech channel carries up to 11.4 Kbps.
Hull rate data channel ( TCH/H4.8), Full rate data channel (TCH/H2.4) channels carry the data at the speed
of 4.8 Kbps, 2.4 Kbps respectively.
After channel coding is applied is converted to data transferred rate at up to 11.4 Kbps.
CCCH stands for the common control channel in GSM.
GSM common control channel ( CCCH ) is used for conveying from network to the mobile subscriber and
provide access to the mobile subscriber,
There are three types of different channels: (I) PCH, (II) AGCH, (III) RACH
Refer the following link to know details of the PCH, AGCH, RACH channel, and their processing.

GSM Paging channel ( PCH )

GSM Access grant channel ( AGCH )

GSM Random access channel ( RACH )

AGCH stands for Access grant channel in GSM.
The AACH is used by the base station to provide forward link communication to the mobile. It carries data
that instructs the mobile to operate in a specific channel with a particular dedicated control channel.
It is the message sent by the base station before a subscriber is moved off the control channel.
The AGCH is used by the base station to respond to RACH sent by the mobile station in the earlier CCCH
frame.
BCCH stands for the broadcast control channel. This article learns to GSM broadcast control channel.
The BCCH is a forward channel and also is a unidirectional base to mobile channel that provides
information about the network, the cell in which the mobile is currently located and adjacent cells. BCCH is
transmitted in 51 frames multi frame structure in a frame next to SCH on TS0. It broadcast a list of the
channel that is currently in use within the cell.
C2 General
The BCCH includes two channels, they are: (I) FCCH (II) SCH
FCCH stands for the Frequency correction channel in GSM.
It is a base to mobile channel that provides information for carrier synchronization. It is a special data burst
that occupies the TS0 slot for the first GSM frame. It is repeated every ten frames within a control channel
multi-frame.
The FCCH allows the mobile subscriber to synchronize its internal frequency standard with the frequency
of the base station.
In the first burst of FCCH, all zero bits are sent to indicates the unmodulated carrier.
Important link: https://www.ecstuff4u.com/2018/02/sacch-in-gsm.html
C2 General