Huawei Airbridge CBTS3612-800 User Manual page 17

User Manual
Airbridge cBTS3612-450 12-carrier CDMA Base Station
IV. This cell is in blocked status
If you see at the OMC maintenance console that the logic configuration of a cell has
been completed, but the mobile station still cannot gain access to a network, then you
can check whether this cell is in blocked status.
When a cell is in blocked status, the base station will cut off the transmission signals
of BTRM corresponding to this cell carrier and this makes the mobile station unable to
gain access to a network.
You may query BTRM status at the OMC maintenance console to see whether the
BTRM corresponding to this cell has been blocked.
If the cell is in blocked status, the mobile station cannot gain access to a network until
the user has unblocked it.
V. Abnormal receiving channel
If you see at the OMC maintenance console that the logic configuration of a cell has
been completed, but the mobile station still cannot gain access to a network, then you
can check whether the receiving channel of a base station is abnormal.
An abnormal BS receiving channel will lead to excessive receiving error codes and
frequent mobile station dropouts. The mobile station, when started, will send a
power-on registration message to the system. However, the base station cannot
receive this registration message because of a faulty receiving channel. Thus, the
base station will not send any base station answer instruction to this mobile station,
which leads to failed registration of this mobile station. Because of failed registration,
the mobile station enters the system defining sub-status and recaptures the system.
When the system is captured, the mobile station will start again the power-on
registration. Such things happen repeatedly, so that the mobile station cannot gain
access to a network.
You may test the mobile station via CDMA and trace air interface messages. If the
mobile station sends "Registration message" but does not receive any "Base station
answer instruction" message, it shows that some fault has occurred to the reverse
receiving channel of the base station.
If there exists any receiving channel abnormality, you may check point by point as
follows and make judgements by viewing related indicators, querying the board status
and alarm information, etc.
Whether the CDU, RLDU and BTRM module are well installed and the panel
l
screws are correctly fastened.
Whether the antenna feeder connection is correct.
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Whether the CDU works normally.
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Whether the RLDU works normally.
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Whether the configuration selection switch "S/W" on the RLDU panel is set
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correctly. For the description of RLDU panel switch, please refer to "Board
Indicator and DIP Switch" of "Base Station Maintenance" part in the user
manual.
Whether the BTRM works normally.
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Whether the BCPM works normally.
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Whether the blind plugs of various modules of the receiving channel are normally
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connected and there is any loosening.
Whether the physical configuration data of the base station are correct, including
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the cell parameter, backward search parameters, etc.
03Q-0112-20020720-120
1 MS Unable to Access Network
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