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View Full Version : Question CSSR degraded after lock TRX



radenmohawk
2010-01-22, 04:04 AM
Hi Masters...

I had problem, BTS type is FlexiBTS Nokia with config 2/2/2.I had requested from operators to locked TRX. when I locked 1 TCH TRX on sector1 so config 1/2/2 and now only BCCH TRX working then CSSR degraded (no issue SDCCH block, SDCCH drop or TCH Block) due to Low TCH assignment success rate and appears alarm 7743 and 7745 on BCCH TRX sector1. Before Lock no alarm appears. From ND196 show no hard degradation on Quality Downlink 5.
After I unlocked, CSSR back to normal and no more appears alarm 7743 and 7745.

Any suggestion for this??? :L

crisnspro
2010-01-23, 03:46 PM
reset the site

RF engineer
2010-01-24, 05:46 AM
dear as you mentioned you have problem in tch assignment success rate so if you more to check what are the raw data which makes this kpi you can easily find what is the problem and roughly you donot have problem in congestion or degradation in signal neither interference it may your system can give alarm incase for 1trx as remark or you donot have enough tch how many ts is define for PDCH

pramudya
2010-02-24, 02:39 AM
Hi,

Try to change TCH Frequency on sector 1, there are possibility of TCH interference.

tukangoptim
2010-02-24, 04:45 AM
Hi Masters...

I had problem, BTS type is FlexiBTS Nokia with config 2/2/2.I had requested from operators to locked TRX. when I locked 1 TCH TRX on sector1 so config 1/2/2 and now only BCCH TRX working then CSSR degraded (no issue SDCCH block, SDCCH drop or TCH Block) due to Low TCH assignment success rate and appears alarm 7743 and 7745 on BCCH TRX sector1. Before Lock no alarm appears. From ND196 show no hard degradation on Quality Downlink 5.
After I unlocked, CSSR back to normal and no more appears alarm 7743 and 7745.

Any suggestion for this??? :L

hi brader,
with 7745 come up mean our failure rate increase after 1 trx operating left. we can try to change that problemo subchannel to FR, or move bcch and enough SD to another trx and lock this one. let see the effect..

maasricht
2010-02-24, 05:38 AM
There is no hw problem. It seems not enough TCH Channel.

We are talking about 1 TRX = 8 TS

Howmany TS used for SDCCH and reserved for GPRS?