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User Manual
Airbridge cBTS3612 CDMA Base Station
or released, main control software needs to distribute or release the AAL2 traffic
link of the corresponding Abis interface.
Physical channel modification function: in the process of a communication over
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a dedicated channel, BSC can modify some parameters of this channel on the
physical layer. The parameters include: long code mask, reverse pilot gate
control rate, forward power control mode and MS pilot gain. After receiving the
message from BSC, the main control software identifies the BCPM number of
the dedicated channel, and sends message to the BCPM board, instructing the
modification of physical parameters.
Common channel mutual -aid function: when part of channel elements in a
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channel resource pool are damaged, and part of or all of common channels in
this resource pool are unavailable, the main control software will attempt to
move the affected common channels onto some available channels. At the
same time, BCKM will send message to BCPM, requesting it to re-establish
these channels.
Transmission delay report function: when the BTS seizes a reverse dedicated
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channel, or after the acquisition the air interface delay from the MS to the BTS
changes over 1 chip, BCPM will report to main control software about the air
interface delay of this dedicated channel. Then main control software forwards
the channel delay information to BSC.
4) Active/standby switchover
To improve the system reliability, main control software works in active/standby
mode. The active main control software backs up call data to the standby in real time.
When the active equipment gets faulty, active/standby switchover will be conducted.
Therefore the communication can continue on the channel without any interruption.
5) Operation & maintenance
The O&M functions include data configuration, status report, interface tracing, fault
alarm, restart control, switchover control, log transfer and process reporting.
3.2.2 O&M Software
I. Function
Operation & maintenance software unit (OMU) is the maintenance control part of
cBTS3612. Other software modules in the BTS have their own int erfaces to the
OMU.
OMU monitors the operation of BTS. It is the bridge between the O&M center (OMC)
and all devices of cBTS3612. OMU is connected upward with OMC and downward
with the function units of BTS. On one hand, OMU receives instructions from OMC,
converts them into control unit instructions and sends them to the function units. On
3-4
System Description
3 Software Architecture
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