User Manual
iSiteC BTS3601C CDMA Base Station
BTS Maintenance
Chapter 4 Fault Analysis and Locating
4-9
I. Fault in MS Access to Network
What is MS access to the network?
When a MS is powered on, it first enters the System Determination Substate. In this
substate, MS can decide whether to select the analog system or the CDMA system
based on parameters preset by the subscriber. If the CDMA system is selected, the MS
will attempt to acquire the CDMA system at the basic frequency or the auxiliary
frequency and enter Pilot Channel Acquisition Substate.
In this substate, the MS will first search all pilots (search all PN offsets), and then find
the select the strongest pilot and acquire it. Once the pilot is acquired, MS will enter the
Sync Channel Acquisition Substate.
In this substate, the MS will attempt to get the synchronization channel and receive
synchronization messages, through which the MS can get such information as pilot's
PN offset, NI, long code status, system time, paging channel rate and the frequency of
the basic paging channel. Then it will enter the Timing Change Substate.
In this substate, the MS will synchronize long code status and system timing with
CDMA system timing based on the information received from the synchronization
channel messages, including pilot PN offset, long code status and system time. Then it
will enter the idle state.
In this idle status, the MS should receive the overhead message from the paging
channel. The MS cannot work normally unless it receives the overhead message
within the specified duration.
Once all the above requirements are me t, the MS can access to the network.
1)
Fault Description
The MS is unable to acquire the CDMA network just after startup.
2)
Troubleshooting
First make sure the MS parameters (such as basic frequency, auxiliary frequency, SID
and NID etc.) have been correctly configured, and then go through the following
procedures step by step to locate and eliminate faults:
Fault cause
Fault location
Handling methods
Remarks
Cell is not
started
1. The BTS is not started due to BTS
equipment fault.
2. The BTS is not started due to lack
of correct BTS data.
Please refer to “4.5.2 BTS
Initialization Failure” for fault
elimination measures.
