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User Manual
Airbridge cBTS3612-450 12-carrier CDMA Base Station
If any problem is found at some step, handle it according to the corresponding
chapter or section. For example, a BTRM module fault should be handled as
described in "6.5 Transceiver Module (BTRM)".
VI. Abnormal transmission channel
Transmission activation (BTRM), BHPA, CDU and antenna feeder form the
transmission channel. But an abnormal transmission channel will lead to no output
signal from the base station or abnormal output signals. In this case, you may 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
may check point by point as follows:
Whether the CDU, BHPA module and BTRM module are well installed and the
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panel screws correctly fastened.
Whether BTRM transmission activation part works normally.
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Whether the CDU works normally.
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Whether BTRM and BHPA are normally connected.
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Whether the BHPA works normally.
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Whether BHPA and CDU are connected.
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Whether the feeder connection between CDU and the cabinet top is normal.
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Whether the feeder connection between the cabinet top and the antenna is
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normal.
Whether the blind plugs of various modules of the receiving channel are normal
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and whether there is any loosening.
Whether the antenna is correctly installed.
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Whether there is any standing wave ratio alarm.
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If any problem is found at some step, handle it according to the corresponding
chapter or section. For example, a BTRM module fault should be handled as
described in "6.5 Transceiver Module (BTRM)".
VII. The cell gain and common channel gain are not correctly set
You may 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. In
this case, you may check whether various gain parameters during the cell
configuration are correctly set.
When the cell is logically configured, such parameters as the sector gain, carrier gain,
pilot channel gain, synchronization channel gain, paging channel gain, etc. must be
configured. If these parameters are improperly set (for example, excessively small),
the mobile station will not be able to capture the corresponding common channel and
this makes the mobile station unable to gain access to a network.
Make sure whether the gain parameters contained in Abis-Cell Setup message are
reasonable via the Abis interface message tracing tool. If unreasonable, the data
configuration table of BSC must be modified and the gain parameters be configured
again.
VIII. The overhead message content is not correct
You may 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. In
this case, you may check whether the overhead message content is correct.
Upon entering the idle status, the mobile station must receive all overhead messages
(including at least the following four: the access parameter message, system
parameter message, CDMA channel list message and adjacent area list message.
03Q-0112-20020720-120
1 MS Unable to Access Network
1-4
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