Ms Unable To Access Network; About Mobile Station Network Access; Disabled Mobile Station Network Access - Huawei Airbridge CBTS3612-800 User Manual

User Manual
Airbridge cBTS3612-450 12-carrier CDMA Base Station

1 MS Unable to Access Network

1.1 About Mobile Station Network Access

Once powered on, an MS first enters the System Determination Substate and then
selects an analog system or CDMA system based on the parameters predefined in
the mobile station by the user. If the CDMA system is selected, the mobile station will
attempt to capture it and enters the Pilot Channel Acquisition Substate.
In this substate, the mobile station will first search the primary frequency bands for all
pilot channels (search all PN offsets), and captures the strongest pilot channel. If
there are no pilot channels captured on the basic frequency bands, the mobile station
will tune to an auxiliary frequency band and continue searching for a pilot channel.
When the mobile station has captured a pilot channel, it enters the Sync Channel
Acquisition Substate.
In this substate, the mobile station will attempt to obtain a sync channel and receive
synchronization messages. And by means of these messages, the mobile station can
obtain the pilot PN offset, network system identity, long code status, system time,
paging channel rate, frequency bands on which basic paging channels are, etc. Once
this information is obtained, the mobile station will enter the Timing Change Substate.
In this substate, the mobile station will use the pilot PN offset, long code status
received in the sync channel messages and synchronizes the long code status and
system timing with the CDMA system timing. After that, the mobile station will enter
the Mobile Station Idle State.
In the idle status, the mobile station needs to receive the overhead messages on the
paging channels. The mobile station cannot work normally unless it has received
correct Overhead Messages within the specified period of time.
If all the above conditions are satisfied, the mobile station will normally gain access to
a network.

1.2 Disabled Mobile Station Network Access

1.2.1 Description of Fault
When started, the mobile station cannot access the CDMA network.
1.2.2 Fault Analysis and Location
Before locating any base station fault, make sure that the parameters for a mobile
station are correctly set, such as the basic frequency band, auxiliary frequency band,
SID, NID, etc.
I. Base station not in service
The base station is not in service and the mobile station cannot gain access to a
network. The causes for the base station not to be in service include:
03Q-0112-20020720-120
1 MS Unable to Access Network
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