How to improve Call setup success rate

[cocola]

Dear my Expert. Could anyone plz help me to solve the problem in low Call setup Success rate ? Where are the possible reason ? Our vendor is E*******.
Thanks.

[binladen]

I think to improve CSSR you must improve other KPIs as : SD block, TCH drop, SD drop... Because CSSR is relative to these KPI. You can look formula of CSSR.

[RF engineer]

I think to improve CSSR you must improve other KPIs as : SD block, TCH drop, SD drop... Because CSSR is relative to these KPI. You can look formula of CSSR.

Plus TCH Congestion and correct CGI both on BSC and NSS.
BR
RF

[RF Engr]

Dear,
Please check assignment rate per trx on cells with low cssr.
check uplink , downlink qualty of cells, check overshooting, TCH congestion , SD congestion, sd drop, sd assign is not included in Cssr formula as far as i know.but not sure about it.Please check all these things and let us know did you find any issue in above mentioned kpi's