High Call drop during specfic Hour

[rajmeena06]

Hi genious,

I working huawei 2g(Bsc6000) system and Observed In BBH Report that most of cell which are below benchemark are in Hour 00:00;23:00.Call drop rate is high on those cells.These cell Rx quality is good at that time and some cell are constant but some randmly change.day by day
What may be the reasons of this and what i need too check.Pl sujjest From where i start.

[dacoder]

Did you check if the transmission link is stable during those hours. Also check if there are any alarms as well

Thanks

[auto_art]

actually in 00&23 hours mean holding time of calls increases & no of call attempts began to decrease to a low value. low calls that might be the reason. e.g. if there are 2 drops in 50 cals. drop rate shoots up to 4 %.

[rajmeena06]

Buts thats the Busy hour of those cells dear.

[zoro78]

what is the type of BTS that you use?

[auto_art]

Buts thats the Busy hour of those cells dear.

yeah i got u...but i have observed in my nw. that cells having bbh at midnight doeas have low no of calls..

[kevin_h811]

hI rajmeena,

Have u check CALL DROP CAUSES in BSC6000?it can be collected..

Regards//

[srilasitha]

do you mean 00:00 to 23:00 or 23:00 to 0:00

Please specify the problem clearly....... mention whether those cells carry low traffic compared to other cells

in M2000 busy hour query shows sites with zero traffic or low traffic gets data in 00:00 window. is that what you mention

[Md.Moniruzzaman]

You have to first identified which type of drop dominant there like Signal Strength/Quality /Sudden/Other/TA...
Then which direction drop dominant DL/UL
Some action points like this
1. if DL Quality Drop dominant ----- Hardware/Cable..etc check
2. if UL Quality Drop dominant------interference/Frequency check
3. if DL Signal Strength Drop dominant-----Check Coverage hole exist?/Antenna selection/Tilt...
4. if Sudden Drop dominant ------Check Tx link quality/BS fault/Operational issue (like frequent outage ?)
5. if Other drop dominant----Check neighbor relation/delete unnecessary neighbor/BS fault

Hope this will help you :)