SDCCH Drop Problem

[kahnoie]

Wrong t3212 timer value for few cells is lower than other cells would result in more periodic LU by MS results in high SDCCH load.
SDCCH drops are linked to interference from other cells or due to large cell coverage (many subscribers at the cell border, with low RXLEV). Steps that can be taken to reduce SDCCH blocking are:
1. Increase T3212 from every 4 hours to every 6 or 8 hours.
2. SDCCH HO should be disabled as it does not improve the QoS
3. Try to reduce TA filter from 64 (32km) to 15 (7.5km) for a few hours.
4. Try to increase RXLEV_ACCESS_MIN from -104dBm to -98dBm for a few hours and observe the result.

[kais]

Hi gprastomo,

I'm facing a SDCCH drop problem for about 200 cells !!!!

-I tried to change SD from trx to another one but no success
-The frequency plan is good
-No HW problem

So what's the problem
Please help

activate HO SD feature and chek for improvement.

[Khairul]

activate HO SD feature and chek for improvement.

Brother..
Drill into the cause of the SDCCH drop.. is it RF or Non RF reason.. and plans your way from there.. most of the problem could be easily resolved by knowing what cause it.. if it planning, maintenance, traffic driven and only then.. you would resolved and optimized..

Best regards,
krule

[adriansyah]

try to help:

1. Check Timeslot status (Maybe faulty)
2. Check TRX
3. Check Combiner
4. Check Site status (maybe equip / hw error)
5. Check Transmission link (maybe congestion in a interface)
6. Try to tracing in OMC , and check mobile originating steps , which step it fault (which part , fail like : ran , core and etc)

[ghassen]

Hi all,

I'm facing a big problem, I have a big number of SDCCH drop per cell in my area which decrease CSSR (nokia product).

Please advise

try to increase the CRH it can work

[simmus0300]

try to help:

1. Check Timeslot status (Maybe faulty)
2. Check TRX
3. Check Combiner
4. Check Site status (maybe equip / hw error)
5. Check Transmission link (maybe congestion in a interface)
6. Try to tracing in OMC , and check mobile originating steps , which step it fault (which part , fail like : ran , core and etc)

share the commands in nokia with parameters to checking above mentioned
suggestions.

[simmus0300]

Hi,

1. Kindly check the alarms whether there is alarms on TRX, Combiner, etc
2. Check Interference, (Co/Adj BCCH or other freq), change the ARFCN to the clean one.
3. Finally, you can move the SDCCH Channel to the other Trx which is clean

br

Pl share the commands in nokia with parameters to checking above mentioned
suggestions.

[diankestiwi]

i think maybe u can change sdcch kanal to the best kanal at that slot

[ghassen]

Hi all,

I'm facing a big problem, I have a big number of SDCCH drop per cell in my area which decrease CSSR (nokia product).

Please advise

also you can check some counters

[simmus0300]

also you can check some counters

uote:
Originally Posted by gprastomo View Post
Hi,

1. Kindly check the alarms whether there is alarms on TRX, Combiner, etc
2. Check Interference, (Co/Adj BCCH or other freq), change the ARFCN to the clean one.
3. Finally, you can move the SDCCH Channel to the other Trx which is clean

br
Pl share the commands in nokia with parameters to checking above mentioned
suggestions.