| |
Direction
|
Logical Channel
|
PHY Channel
|
Function
|
|
Signaling
|
DL
|
BCH
|
FCCH
|
Frequency correction
|
|
SCH
|
Frame synchronisation + BSIC
|
|
BCCH
|
Broadcast of cell information,
e.g. channel combination
|
|
DL
|
CCCH
|
PCH
|
Paging mobiles
|
|
UL
|
RACH
|
Requesting dedicated channel
|
|
DL
|
AGCH
|
Access Grant Channel/Allocating dedicated/traffic CH
|
|
DL
|
NCH
|
Notifying MSs (for VGCS & VBC)
|
|
DL/UL
|
DCCH
|
SDCCH
|
Signalling between MS and BTS
|
|
SACCH
|
Measurements, TA, Power Control, ...
|
|
FACCH
|
Extra signalling within 26 TDMA Multiframe
|
|
Traffic
|
DL/UL
|
TCH/F
|
DBPSCH
|
full rate traffic channel (GMSK)
|
|
TCH/H
|
DBPSCH
|
half rate traffic channel (GMSK)
|
| E-TCH |
DBPSCH
|
Carries 8-PSK user data |