KPI Formula

Copyright 2007 Nokia Siemens Networks. All rights reserved. Nokia Siemens Networks 12 / 14 12. KPI DEFINITION AND GENERAL FORMULA (a) CSSR (Call Setup Success Rate) Definition: Rate of calls going until TCH successful assignment Formula: CSSR = (1- SDC Congestion)*(1-SDCDrop)*(1- TCH Assignment Block)*(1-TCH Assignment Failure) (b) SCR Definition: Rate of calls going until normal release that is not interrupted by SDCCH DROP, neither by assignment failures, and neither by CALL DROP. Formula : SCR = CSSR * (1 – TCH_Drop_Rate) (c) Call Drop Rate Definition: Rate of all losses of TCH connections during a call in relation to the number of successful Call Setups Formula : % 100 * ∑ ∑ ∑ OutGoing HO - Inc HO _Seizure TCH_Normal op TCH_MiscDr + es TCH_RFloss = Rate Call_Drop_ + (d) HOSR (Hand Over Success Rate) Definition: Successful internal and external outgoing handovers of total number of internal and external outgoing handover attempts Formula : % 100 * HO_Attempt d _Controlle BSC_or_MSC g_Success_ HO_Outgoin = te Success_Ra Hand_Over_ (e) SDCCH Block Rate Definition: SDCCH congestion of total number of SDCCH seizure attempts Formula : % 100 * mpts SDCCH_Atte ked SDCCH_Bloc = k_Rate SDCCH_Bloc (f) SDCCH Drop Rate Definition: Dropped SDCCH connections of total number of SDCCH connections without TCH congestion Formula : % 100 * ures SDCCH_Seiz _Drop SDCCH_Misc + osses SDCCH_RF_L = _Rate SDCCH_Drop (g) TCH Assignment Block Rate Definition: Rate of TCH unsuccessful seizures during assignment procedure due to congestion Formula : % 100 * _Attempts TCH_Normal TCH_Blocks = _Rate ment_Block TCH_Assign

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Transcript of KPI Formula

12 / 14

12. KPI DEFINITION AND GENERAL FORMULA (a) CSSR (Call Setup Success Rate)

Definition: Rate of calls going until TCH successful assignment

Formula: CSSR = (1- SDC Congestion)*(1-SDCDrop)*(1- TCH Assignment Block)*(1-TCH Assignment

Failure)

(b) SCR Definition: Rate of calls going until normal release that is not interrupted by SDCCH DROP, neither by assignment failures, and neither by CALL DROP. Formula : SCR = CSSR * (1 – TCH_Drop_Rate) (c) Call Drop Rate Definition: Rate of all losses of TCH connections during a call in relation to the number of successful Call Setups

Formula : %100*∑

∑ ∑

OutGoing HO - Inc HO _SeizureTCH_Normal

opTCH_MiscDr+esTCH_RFloss=RateCall_Drop_

(d) HOSR (Hand Over Success Rate) Definition: Successful internal and external outgoing handovers of total number of internal and

external outgoing handover attempts

Formula : %100*HO_Attempt

d_ControlleBSC_or_MSCg_Success_HO_Outgoin=teSuccess_RaHand_Over_

(e) SDCCH Block Rate Definition: SDCCH congestion of total number of SDCCH seizure attempts

Formula : %100*mptsSDCCH_Atte

kedSDCCH_Bloc=k_RateSDCCH_Bloc

(f) SDCCH Drop Rate Definition: Dropped SDCCH connections of total number of SDCCH connections without TCH congestion

Formula : %100*uresSDCCH_Seiz

_DropSDCCH_Misc+ossesSDCCH_RF_L=_RateSDCCH_Drop

(g) TCH Assignment Block Rate Definition: Rate of TCH unsuccessful seizures during assignment procedure due to congestion

Formula : %100*_AttemptsTCH_NormalTCH_Blocks=_Ratement_BlockTCH_Assign

13 / 14

(h) TCH assignment Failure Rate (excluding blocking) Definition: Rate of RTCH seizure failed (system + radio) during normal assignment procedure over the total amount of RTCH request for normal assignment procedure

Formula : %100*_AttemptsTCH_Normal

SSTCH_Fail_B+adioTCH_Fail_R=re_Ratement_FailuTCH_Assign

∑

∑ ∑

(i) EMD (Erlang Minute per Drop Definition: Total of Erlang minutes (TCH occupation) in one period measurement per drop call (after TCH Assignment).

Formula : ∑ ∑

∑

ropTCH_Misc_D+sesTCH_RF_Los

60*lang)Traffic(Er=EMD