KPI (CDR,CSSR)formulas for different Vendors
Huawei:
CDR = (Call Drops on Radio Interface in Stable State (Traffic Channel) + Call Drops on Radio Interface in Handover State (Traffic Channel) + Call Drops due to No MRs from MS for a Long Time (Traffic Channel) + Call Drops due to Abis Terrestrial Link Failure (Traffic Channel) + Call Drops due to Equipment Failure (Traffic Channel) + Call Drops due to Forced Handover (Traffic Channel)) / (Successful TCH Seizures (Traffic Channel)) * 100
CSSR = (Success Rate of TCH Assignment*Success Rate of Call Setup (Immediate Assignment)/10000)*100
ALCATEL:
CDR = Total TCH Drops / [Total TCH Seizures - (Successful HO Out) - (Successful Intracell HO)]= MC736+MC621+MC14c+MC739+MC921c) / ((MC717a + MC717b) + (MC718) - (MC712))
CSSR= SDCCH Assignment Success Rate * TCH Assignment Success Rate or =(1-SDCCH drop rate)*(1-TCH congestion rate)*(1-TCH assignment failure rate)= [1-([(MC138+MC07+MC137)] / [(MC01+MC02)])] * [1-([(MC140a- (MC142e+MC142f)- MC718] / [MC140a- (MC142e+MC142f)])]
ZTE:
CDR=Total TCH Drops / [Total TCH Seizures - (Successful HO Out) - (Successful Intracell HO)]= C11615/[(C11657+C11659+C11921+C11923+C11667)-(C11669)]
CSSR= SDCCH Assignment Success Rate * TCH Assignment Success Rate or =(1-SDCCH drop rate)*(1-TCH congestion rate)*(1-TCH assignment failure rate)=
(1-C11605*100/(C11625+C11696))×(1-(C11610-C11697)*100/(C11609-C11696))×(1-C11657*100/(C11657+C11658))
