Chapter 6 - Troubleshooting
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5.
The fault locating flow is as shown in Figure 71.
F
I G U R E
7 1
F
A U L T
L
O C A T I N G
F
L O W
C
H A R T F O R
C
E L L
C
A R R I E R N O T
B
E I N G
O
C C U P I E D
Start
Whether TRU-PA-AEM RF
cable connection is reliable
Whether the PA output
power is too low
NO
YES
Adjust power control
and replace the TRM
NO
YES
NO
Whether the carrier
can only be occupied for
a short time
Whether the carrier is not
occupied for a long time
Block the TCH channel
of other carriers
Unblock the TCH
channel of other
carriers
Remotely reset the
TRM
Whether the fault is
solved
NO
Whether divider-TRU RF
cable connection is reliable
Remove the TRU-
divider connection
problems
Remove the
TRU-PA-AEM
connection problems
Whether the TRM is
inserted tightly
Insert the TRM
module tightly
Replace the TRM
module
YES
YES
End
YES
YES
NO
NO
YES
6.
Troubleshooting
i.
Observe the time slot occupancy in dynamic data management to
confirm whether it has not been occupied for a long time.
ii.
At night, when the traffic gets less, block the TCH slots of the other
carriers by blocking the logic channel.
iii.
Observe the time slot occupancy of the carrier, if there are TCHs
occupied stably for a long time, the fault may be caused by the
improper algorithm assignment. Not changing the carrier eagerly,
go on observing to see whether the fault still occurs and the
performance indexes of the current cell decrease.
iv.
If the time slot is transitorily occupied (with 10 seconds), consider
whether faulty time slots occur at the carrier. Remotely reset the
carrier, and continue observing it. If still so, go to the site to test
the PA output power or the receiving level of the test mobile phone.
If the PA output power of the carrier is lower than that of other
carriers, adjust the power control. If the fault still stays there,
consider replacing the ETRM. If the ETRM functions well, check
