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TitleEricsson KPI Formulas Review
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Total Pages10
Table of Contents
                            Ericsson KPI Formulas
Accessibility
Accessibility (Continue)
Accessibility (Continue)
Retainability
Retainability (Continue)
Retainability (Continue)
Mobility
Mobility (Continue)
Traffic
                        
Document Text Contents
Page 1

Ericsson KPI Formulas

Page 2

Accessibility
 Call Setup Success Rate
 CSSR_Voice(%)
 100 * ([ReqCsSucc] / [ReqCs] * [pmNoNormalNasSignReleaseCs] /

([pmNoNormalNasSignReleaseCs] + [pmNoSystemNasSignReleaseCs]) *
[pmNoRabEstablishSuccessSpeech] / [pmNoRabEstablishAttemptSpeech])
 Not sure why NAS signaling Release Success Rate is multiplied in CS CSSR?
 Suggest to use the following formula:
 100 * [pmTotNoRrcConnectReqCsSucc] / [pmTotNoRrcConnectReqCs]-

[pmNoLoadSharingRrcConnCs] * [pmNoRabEstablishSuccessSpeech] /
[pmNoRabEstablishAttemptSpeech]

 CSSR_Video(%)
 Same as CSSR_Voice, NAS Signaling Release Success Rate is multiplied in the formula?
 Suggest to use the following formula:
 100 * [pmTotNoRrcConnectReqCsSucc] / [pmTotNoRrcConnectReqCs]-

[pmNoLoadSharingRrcConnCs] * [pmNoRabEstablishSuccessCs64] /
[pmNoRabEstablishAttemptCs64]

Page 3

Accessibility (Continue)
 PDP Context Activation Success Rate (R99 PS)
 CSSR_PS_R99(%)
 100 * [ReqPsSucc] / [ReqPs] * [pmNoNormalNasSignReleasePs] /

([pmNoNormalNasSignReleasePs] + [pmNoSystemNasSignReleasePs]) *
[pmNoRabEstSuccessPsIntNonHs] / [pmNoRabEstAttemptPsIntNonHs]
 The formula is actually used to calculate the PS Call Success Rate
 May need to check if SGSN/GGSN can generate the relevant counters to compute this KPI

and differentiate between R99 PS and HSDPA by QoS metrics or collect by driving test.
 Otherwise, need to revise the KPI name to “PS Call Setup Success Rate (R99)”.
 If so, suggest to use the following formula
 100 * [pmTotNoRrcConnectReqPsSucc] / [pmTotNoRrcConnectReqPs]-

[pmNoLoadSharingRrcConnPs]) * [pmNoRabEstSuccessPsIntNonHs] /
[pmNoRabEstAttemptPsIntNonHs]

Page 4

Accessibility (Continue)
 PS Setup Success Rate (HSDPA)
 CSSR_PS_HSDPA(%)
 100 * [ReqPsSucc] / [ReqPs] * [pmNoNormalNasSignReleasePs] /

([pmNoNormalNasSignReleasePs] + [pmNoSystemNasSignReleasePs]) *
[pmNoRabEstablishSuccessPacketInteractiveHs] /
[pmNoRabEstablishAttempPacketInteractiveHs]
 Same situation as CSSR_PS_R99, suggest to use the following formula
 100 * [pmTotNoRrcConnectReqPsSucc] / ([pmTotNoRrcConnectReqPs] –

[pmNoLoadSharingRrcConnPs]) * [pmNoRabEstablishSuccessPacketInteractiveHs] /
[pmNoRabEstablishAttempPacketInteractiveHs]

Page 5

Retainability
 CS Call Drop Rate
 CDR_CS(%)
 100 * [pmNoSystemRabReleaseSpeech] / ([pmNoNormalRabReleaseSpeech] +

[pmNoSystemRabReleaseSpeech])
 The formula only accounts speech service which does not match with the KPI name.
 Either change the KPI name or change the formula as below
 100 * ([pmNoSystemRabReleaseSpeech] + pmNoSystemRabReleaseCs64]) /

([pmNoNormalRabReleaseSpeech] + [pmNoSystemRabReleaseSpeech] +
[pmNoNormalRabReleaseCs64] + [pmNoSystemRabReleaseCs64])

Page 6

Retainability (Continue)
 PS Call Drop Rate
 CDR_PS_R99(%)
 100 * ([pmNoSystemRabReleasePacket] - [pmNoSystemRabReleaseHs] –

[pmNoSystemRabReleasePacketUra]) / ([pmNoNormalRabReleasePacket] +
[pmNoSystemRabReleasePacket] - [pmNoNormalRabReleaseHs] -
[pmNoSystemRabReleaseHs] – [pmNoNormalRabReleasePacketUra] -
[pmNoSystemRabReleasePacketUra] + [pmChSwitchSuccFachUra] +
[pmNoSuccRbReconfOrigPsIntDCH])
 The formula exclude Rab release under URA state. The formula considered to be OK if

URA state is not used. Otherwise, it should not be excluded in the formula.

Page 7

Retainability (Continue)
 PS Call Drop Rate
 CDR_PS_HSDPA(%)
 100 * [pmNoSystemRabReleaseHs] / ([pmNoSystemRabReleaseHs] +

[pmNoNormalRabReleaseHs] + [pmNoSuccRbReconfOrigPSIntHs] +
[pmNoSuccRbReconfOrigPsIntEul] + [pmPsIntHsToFachSucc])
 OK, no problem.

Page 8

Mobility
 Soft handover Success Rate
 SHO SR(%)
 100 * ([pmSofterHoSuccessNonIur] + [pmSoftHoSuccessNonIur] +

[pmSoftSofterHoSuccessIur]) / ([pmSofterHoAttemptNonIur] + [pmSoftHoAttemptNonIur] +
[pmSoftSofterHoAttemptIur]
 OK.

 Inter RAT handover Success Rate (2G/3G)
 ISHO_CS_3Gto2G(%)
 100 * ([pmNoSuccessOutIratHoSpeech] + [pmNoSuccessOutIratHoMulti]) /

([pmNoAttOutIratHoSpeech] + [pmNoAttOutIratHoMulti])
 OK.

 ISHO_PS_3Gto2G(%)
 100 * [pmNoOutIratCcSuccess] / [pmNoOutIratCcAtt]
 OK.

Page 9

Mobility (Continue)
 Hard handover Success Rate
 Single formula for Interfrequency Hard handover that includes all services
 So, it is suggest to have the same definition of KPI across different network

vendor.
 100 * ([InterFreqHoCsSpeech12] + [InterFreqHoCsConversational] +

[InterFreqHoPsInteractiveLess64] + [InterFreqHoPsInteractiveGreater64] +
[InterFreqHoStreamingOther] + [pmSuccNonBlindIfhoPsIntHs] +
[pmsuccNonBlindIfhoPsIntEul] + [pmSuccNonBlindIfhoPsStrHs]) /
([CsSpeech12] + [CsConversational] + [PsInteractiveLess64] +
[PsInteractiveGreater64] + [StreamingOther] + [pmAttNonBlindIfhoPsIntHs]
+ [pmAttNonBlindIfhoPsIntEul] + [pmAttNonBlindIfhoPsStrHs])

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