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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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