User Manual
iSiteC BTS3601C CDMA Base Station
System Description
Chapter 3 System Function
3-15
II. Physical channel configuration
On Um interface is defined series of physical channels, which are divided into
different types according to the channel features. Different RCs support different
channels.
1)
Forward physical channel
The configuration of forward physical channel is shown in Figure 3-8.
F-TCH
Forward CDMA channel
F-CACH
F-CPCCH
F-PICH
F-CCCH
F-DCCH
F-FCH
F-PC
F-SCCH
F-SCH
F-PICH
F-TDPICH
F-APICH
F-ATDPICH
F-SYNCH
F-BCH
F-PCH
F-QPCH
Sub-channel
(RC1~2)
(RC3~5)
Figure 3-8
Forward physical channels
l
Forward Common Assignment Channel (F-CACH)
F-CACH is used for transmitting the assignment information in quick response to the
reversed channel, and provides the support for random access packet transmission in
the reversed link. F-CACH controls Reverse Common Control Channel (R-CCCH)
and Forward Common Power Control Channel (F-CPCCH) in Reservation Access
Mode, and provides the quick acknowledgement in power-controlled access mode. In
addition, it also provides congestion control function.
l
Forward Common Power Control Channel (F-CPCCH)
F-CPCCH is used in the system to support multiple R-CCCHs and Reverse
Enhanced Access Channels (R-EACHs) to perform power control.
l
Forward Pilot Channel (F-PICH)
Signals are transmitted on F-PICH all the time. The BTS transmits a fixed signal in
the pilot channel. This signal serves to provide phase reference for the coherent
demodulation of MS receiver to ensure coherent detection, and facilities MS to
acquire synchronization signals from the synchronization channel and sector
identification information.
If the sector supports transmit diversity, it is necessary to configure Forward Transmit
Diversity Pilot Channel (F-TDPICH).
