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Copyright 2007 Nokia Siemens Networks. All rights reserved.
Nokia Siemens Networks
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 : Call_Drop_ Rate =
∑ TCH_RFloss es + ∑ TCH_MiscDr op ∑ TCH_Normal _Seizure + HO Inc - HO OutGoing
* 100%
(d) HOSR (Hand Over Success Rate) Definition: Successful internal and external outgoing handovers of total number of internal and external outgoing handover attempts Formula : Hand_Over_ Success_Ra te =
HO_Outgoin g_Success_ BSC_or_MSC _Controlle d HO_Attempt
* 100%
(e) SDCCH Block Rate Definition: SDCCH congestion of total number of SDCCH seizure attempts Formula : SDCCH_Block_Rate =
SDCCH_Blocked SDCCH_Attempts
* 100%
(f) SDCCH Drop Rate Definition: Dropped SDCCH connections of total number of SDCCH connections without TCH congestion Formula : SDCCH_Drop_Rate =
SDCCH_RF_Losses + SDCCH_Misc_Drop SDCCH_Seizures
* 100%
(g) TCH Assignment Block Rate Definition: Rate of TCH unsuccessful seizures during assignment procedure due to congestion Formula : TCH_Assignment_Block_Rate =
TCH_Blocks * 100% TCH_Normal_Attempts
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Copyright 2007 Nokia Siemens Networks. All rights reserved.
Nokia Siemens Networks
(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 : TCH_Assignment_Failure_Rate =
