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Dears I am experiencing a problems as such High SDCCH drops in some coastal sites!!
SDCCH Mean holding time is long
SDCCH Assigment fail rate is 0%
SDCCH Abis fail is high > 20%
SDCCH Radio fail is high > 20%What could be the reason,
My Equipment is NSN our transmission system is Huwawi!!Abis fail is really high… i don’t know Huawei equipment, but usually if there is an Abis failure, then it is the first thing to fix. Only when all your transmission resources are fine can you start optimize your Radio.
Contact your transmission engineers, ask them to fix the Abis and then check again the SDCCH drop.
I don’t know this KPI but if u’ve got SDCCH Abis fail is high > 20%
it tells u that u need to check transmission equipments. U should have some alarms that can tell u how high is BER.As Pix say, check ur Abis before optimizing ur sites.
The amazing thing is that our transmission Engineer say that there is no problem!!!
though I suspect it is because of the Clock, which mean there is a problem in the synchronization!!!Cheers,
THi,
U need to check by yourself ,check with alarms.
What is the config of your sites? 1 , 2 or 3 sectors do u have?
Because if u’ve got problems in all ur sectors it means that ur Abis need really checkings.Toufic, in last time we also survey same problem on Ultrasites with BTS SW5.0 CD3.0. Please try find TRX with low MHT (2-3 sec.) on this cell and change corresponding BB2 card. As secondary reason – need made extention for LAPD links from 16kbps to 32 (strongly recomended Nokia if AMR use on cell). Gud luck.
Toufic,
if
sdcch radio fail is high remove sd from tch trx..check ut TRP it shud be 1 if ur BCCH freq is clean.
generally sd allocation is done from the low traffic carrying trx.
regarding ur Abis fail
u can change ur RET and SLO paramter
SD DROP, HIGH Particularly in sector 2 and 3.
SD DROP RATE
SECTOR 1 : TRX5&6, SECTOR 2 : TRX 1&2, SECTOR 3 : TRX3&4. PLEASE how do i resolve this.sd drops
SDCCH Mean holding time is long
SDCCH Assigment fail rate is 0%
SDCCH Abis fail is high > 20%
SDCCH Radio fail is high > 20%What could be the reason,
My Equipment is NSNPlz tell me wat parameter use for sd drop to solve……..
Pankaj
For Abis fail,check for Transmission alarms,ghost RACH,etc.
For Radio fail,check for
1.CO-BSIC & BCCH
2.Frequency Plan
3.High TA
4.Hardware & Path Imbalance Issues
5.High TA
6.TSC,etc etc etcWHAT’S THE REASON ?If ALL SITE OF ONE BSC’S , HANDOVER IS FAIL ,LIKE 75%.
REASON FOR SD DROPS , WHAT REPORT CAN I SEE IN NOKIA ENVIRONMENT
How to reduce congestion on netqork level
