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From the measre report, we can see that the cell
4785;SCR-5? has a better )C0N%, then the - event happened
sccessflly.
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Bt after ! seconds, the )C0N% chan*ed so fast and the R2 of the cell4785 was deleted.
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Then the R2 was ot of synchroni"ation. -nd the SIR/)rror vale ofthe (plin' is so bad. The call drop occrred.
-nd there are many pin*/pon* phenomena as below: From the trace
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we 'now that the () hand over from 4455 to4456, then immediately,
hand over bac' to 4455.It cost only or two seconds. This is
nreasonable. It is easy to reslt in radio lin' lost.
From the C$T and I%S, we can find the other problem cased the call
drop, for e@ample, the bad downlin' 1ality and the nei*hbor cell not
confi*red. If in some position the downlin' 1ality is bad, and the
nei*hbor cell has not been confi*red, the call drop will occrred easily.
? Nei*hbor cell not confi*redFor cell 4456, from the I%S trace, we can see that it has the problem
of nei*hbor cell not confi*red. Ast as the cell 9> we analy"ed before.
From the I%S, the plin' has been ot of synchroni"ation, and from the
RRC
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!? $ownlin' bad
For the cell 9445, it has many times of TRB reset and (( No reply,we have collected the lo*s to analy"e the reason.
There are many call drop procedres as below: -fter the () *oes to
F-C+ then call drop occrred.
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&e can see that the () want to *o to the $C+, bt From the
RRC
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It can be solved by optimi"in* the parameter and the covera*e of the
networ'.
HandlingProcess
The pin*/pon* phenomenais abnormal, and the lo*s shows that the
call drops were de to the covera*e of cells and the parameters confi*red.
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