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LTE eRAN6.0 KPI Introduction
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Objectives
� Upon completion of this course, you will be able to:
� Describe the classification of major KPI in LTE RAN
� Describe the details of each KPI, eg. definition and calculation
formula
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Contents
1. KPI Overview
2. Performance KPI Details
3. Driver test KPI
Page2
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Classification of KPI Measurement
� The quality of network performance is mainly evaluated by KPI
(Key Performance Index)
� Drive Test KPI/ Stationary Test: Some KPIs should be attained
by drive test, such as such as coverage KPI and latency KPI,
measurement results are coming from driver test tools
� Performance Measurement KPI: Most of KPIs are attained by
this approach, such as RRC success Rate, HHO success rate,eg,
these KPIs are coming from eNodeB performance statistic.
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eRAN Performance KPI Overview
Page4
Accessability
Retainability
Mobility
Utilization/availa
bility
Major performance
KPI
RRC setup success rate
ERAB setup success rate
Call setup success rate
Call drop rate (VoIP)
Service drop rate (all)
Intra_fre HO out success rate
Inter_fre HO out success rate
HO in success rate
Inter_RAT HO out success rate
RB utilizing rate
Average CPU load
Radio network unavailability rate
Service intergrity Cell download average
throughput
Cell uplink average throughput
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Measurement KPI - Attributes
Description
Measurement
Scope
Formula
Associated
Counters
Measurement KPI
KPI name
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Performance Measurement System
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Measurement Object
Measurement
Unit 1
Measurement
Unit 2
……
Counter 1 Counter 2 Counter 3 Counter 4 Counter 5 Counter 6 Counter 7
Measurement
Family 1……
Measurement
Family 2
…… ……
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Performance Measurement Counter
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Contents
2. KPI Details
2.1 Accessibility KPI
2.2 Retainability KPIs
2.3 Mobility KPIs
2.4 Service Integrity KPIs
2.5 Utilization/Availability KPIs
Page8
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Contents
2. KPI Details
2.1 Accessibility KPI
2.1.1 RRC Setup Success Rate
2.2.2 E-RAB Setup Success Rate
2.2.3 Call Setup Success Rate
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RRC Connection Cause
Page10
RRC ConnectionUE - eNB
RRC causes:MO signaling (Signaling)MO data (Service)MT access (Service)Emergency (Service)High Priority Access
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RRC Setup Success Rate
Page11
KPI name RRC Setup Successful Rate
Measurement scope
Cell/Cluster
Formula
Unit Percentage(%)
%100_ ×=
ionAttemptRRCConnect
ionSuccessRRCConnectSRRRC
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Associated Counters
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RRC Setup Failure Reason
� Possible reason:
� Resource allocation failure (admission failure)
� No response from UE ( Poor coverage or terminal problem)
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Figure 1 Figure 2
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Contents
2. KPI Details
2.1 Accessibility KPI
2.1.1 RRC Success Rate
2.2.2 E-RAB Success Rate
2.2.3 Call Setup Success Rate
Page16
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Radio Access Bearer (E-RAB)
SGW
E-RABUE - SGWUser-Data
E-RAB
UE
� Type of bearers
� Default bear: With default QCI which is specified in HSS
� Dedicate bear: With dedicated QCI which is negotiated by
PDN-GW and PCRF
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E-RAB Setup Success Rate (VoIP)
Page18
KPI name ERAB Setup Success Rate (VoIP)
Measurement scope Cell/Cluster
Formula
Unit Percentage(%)
%100_ ×=
tupAttemptVoIPERABSe
tupSuccessVoIPERABSeSRVoIPERABS
� VoIP is related with QCI 1 bearer
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E-RAB Setup Success Rate (All Service)
Page19
KPI name ERAB Setup Success Rate (All service)
Measurement
scope
Cell/Cluster
Formula
Unit Percentage(%)
%100_ ×=
ttemptERABSetupA
uccessERABSetupSSRERABS
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Associated Counters – Initial E-RAB Setup
Page20
L.E-RAB.IntialAttEst.QCI.x
L.E-RAB.InitialSuccEst.QCI.x
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Associated Counters – Dedicated E-RAB Setup
Page22
L.E-RAB.AttEst.QCI.x
L.E-RAB.SuccEst.QCI.x
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Contents
2. KPI Details
2.1 Accessibility KPI
2.1.1 RRC Setup Success Rate
2.2.2 E-RAB Success Rate
2.2.3 Call Setup Success Rate
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Call Setup Success Rate
Page26
KPI name Call Setup Success Rate
Measurement scope
Cell/Cluster
Formula
Unit Percentage(%)
%100
1
1
×
××=
ttempERABSetupA
ucessERABSetupS
shAttemptionEstabliSigConnectS
shSuccessionEstabliSigConnectS
ionAttemptRRCConnect
ionSuccessRRCConnectCSSR
service
service
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Counters For S1 Dedicated Signaling Setup
Page27
L.S1Sig.ConnEst.Att
L.S1Sig.ConnEst.Succ
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Contents
2. KPI Details
2.1 Accessibility KPI
2.2 Retainability KPIs
2.3 Mobility KPIs
2.4 Equipment Related
2.5 Utilization KPIs / Traffic KPI
2.6 Transport Performance Counter
Page28
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VoIP Call Drop Rate
Page29
KPI name VoIP call drop rate
Measurement scope
Cell/Cluster
Formula
Unit Percentage(%)
%100Re
Re_ ×=
leaseVoIPERAB
leasenormalVoIPERABABCDRVoIP
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Service Drop Rate (All)
Page30
KPI name ERAB drop rate
Measurement scope
Cell/Cluster
Formula
Unit Percentage(%)
%100Re
Re_ ×=
leaseERAB
leasealERABABnormCDRService
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E-RAB Release
� Normal release
� Released with the normal procedure, the statistic is based on each QCI
index
� Abnormal release
� Considered as service(call) drop, the statistic can be based on different
release cause and each QCI index
� Possible causes:
� EPC failure
� Radio link failure
� Handover failure
� Transport failure
� Network congestion
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Abnormal Release
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Figure 1 Figure 2
Figure 3 Figure 4
L.E-RAB.AbnormalRel.QCI.x
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Normal Release
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Figure 1
Figure 2L.E-RAB.NormalRel.QCI.x
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Contents
2. KPI Details
2.1 Accessibility KPI
2.2 Retainability KPIs
2.3 Mobility KPIs
2.4 Service Integrity KPIs
2.5 Utilization/Availability KPIs / Traffic KPI
Page38
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Intra/Inter-frequency Handover Out Success Rate
Page39
KPI name Intra/Inter-frequency Handover Out Success
Rate
Measurement scope
Cell/Cluster
Formula
Unit Percentage(%)
%100_ ×=
tOOutAttempIntraFreqH
sOOutSuccesIntraFreqHSROOutIntraFreqH
%100_ ×=
tOOutAttempInterFreqH
sOOutSuccesInterFreqHSROOutInterFreqH
Note: In HW eNodeB, all the handover attempt statistic is calculated after admission control in target cell, which means HO failure statistic exclude
admission failure
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Associated Counters (Intra eNB)
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L.HHO.IntraeNB.IntraFreq.ExecAttOut
L.HHO.IntraeNB.IntraFreq.ExecSuccOut
L.HHO.IntraeNB.InterFreq.ExecAttOut
L.HHO.IntraeNB.InterFreq.ExecSuccOut
Note: In HW eNodeB, all the handover attempt statistic is calculated after admission determination in target cell,
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Associated Counters (Inter eNB)
X2 Based Handover
Page41
Handover Based on X2 interface
L.HHO.IntereNB.IntraFreq.ExecAttOutL.HHO.IntereNB.InterFreq.ExecAttOut
L.HHO.IntereNB.IntraFreq.ExecSuccOut
L.HHO.IntereNB.InterFreq.ExecSuccOut
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Associated Counters (Inter eNB)
S1 based Handover
Page42
Handover Based on S1 interface
L.HHO.IntereNB.IntraFreq.ExecAttOutL.HHO.IntereNB.InterFreq.ExecAttOut
L.HHO.IntereNB.IntraFreq.ExecSuccOut
L.HHO.IntereNB.InterFreq.ExecSuccOut
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Handover In Success Rate
Page44
KPI name Handover In Success Rate
Measurement scope Cell/Cluster
Formula
Unit Percentage(%)
%100_ ×=
tHOInAttemp
sHOInSuccesSRHOIn
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Associated Counters (Intra eNB)
Page45
L.HHO.IntraeNB.ExecAttIn
L.HHO.IntraeNB.ExecSuccIn
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Related Counters (Inter eNB)
X2 Handover
Page46
Handover Based on X2 interface
L.HHO.IntereNB.ExecAttIn
L.HHO.IntereNB.ExecSuccIn
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Related Counters (Inter eNB)
S1 Handover
Page47
Handover Based on S1 interface
L.HHO.IntereNB.ExecAttIn
L.HHO.IntereNB.ExecSuccIn
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Inter_RAT Handover Out Success Rate (LTE to WCDMA)
Page49
KPI name Inter-RAT Handover Out Success Rate (LTE to WCDMA)
Measurement scope
Cell/Cluster
Formula
Unit Percentage(%)
%100_2_
_2__2_ ×=
AttemptWEIRATHO
SuccessWEIRATHOSRWEIRATHO
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Associated Counters
Page50
L.IRATHO.E2W.ExecAttOut
L.IRATHO.E2W.ExecSuccOut
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Inter_RAT Handover Out Success Rate (LTE to GSM)
Page51
KPI name Inter-RAT Handover Out Success Rate (LTE to GSM)
Measurement scope
Cell/Cluster
Formula
Unit Percentage(%)
%100_2_
_2__2_ ×=
AttemptGEIRATHO
SuccessGEIRATHOSRGEIRATHO
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Associated Counters
Page52
L.IRATHO.E2G.ExecAttOut
L.IRATHO.E2G.ExecSuccOut
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Contents
2. KPI Details
2.1 Accessibility KPI
2.2 Retainability KPIs
2.3 Mobility KPIs
2.4 Service Integrity KPIs
2.5 Utilization/Availability KPIs / Traffic KPI
Page54
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Cell Downlink Average Throughput
Page55
KPI name Downlink Average Throughput
Measurement scope
Cell/Cluster
Formula
Unit bps
sferTimeCellDLTran
ficVolumeCellDLTrafhpCellDLAveT =
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Related Counter - DL Traffic Volume
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� Description:
� The counters measure the total traffic volume of transmitted
PDCP SDUs for each service with a specific QCI ranging from
1 to 9 in a cell.
� Measurement Point
� The size of the payloads in the transmitted PDCP SDUs of
each service with a specific QCI is sampled in a cell. At the end
of a measurement period, the sum of these sampling results is
used as the value of the corresponding counter.
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Related Counter – DL Transmission Time
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� Description:
� The counters measure the transmit duration of downlink PDCP
SDUs for services with a specific QCI ranging from 1 to 9 in a cell.
� Measurement Point
� The transmit duration of downlink PDCP SDUs for each service
with a specific QCI ranging from 1 to 9 in a cell is sampled per
millisecond. If there is downlink data transmission within this
millisecond, the sampling result of the corresponding counter is 1.
At the end of a measurement period, the sum of these sampling
results is used as the value of the corresponding counter.
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Cell Uplink Average Throughput
Page58
KPI name Downlink Average Throughput
Measurement scope
Cell/Cluster
Formula
Unit bps
sferTimeCellULTran
ficVolumeCellULTrafhpCellULAveT =
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Related Counter - UL Traffic Volume
Page59
� Description:
� The counters measure the total traffic volume of received
PDCP SDUs for each service with a specific QCI ranging from
1 to 9 in a cell.
� Measurement Point
� The size of the payloads in the received PDCP SDUs of each
service with a specific QCI is sampled in a cell. At the end of a
measurement period, the sum of these sampling results is
used as the value of the corresponding counter.
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Related Counter – UL Receiving Time
Page60
� Description:
� The counters measure the receive duration of uplink PDCP SDUs
for services with a specific QCI ranging from 1 to 9 in a cell.
� Measurement Point
� The receive duration of uplink PDCP SDUs for each service with a
specific QCI ranging from 1 to 9 in a cell is sampled per
millisecond. If there is uplink data receiving within this millisecond,
the sampling result of the corresponding counter is 1. At the end
of a measurement period, the sum of these sampling results is
used as the value of the corresponding counter.
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Contents
2. KPI Details
2.1 Accessibility KPI
2.2 Retainability KPIs
2.3 Mobility KPIs
2.4 Service Integrity KPIs
2.5 Utilization/Availability KPIs
Page61
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CPU Usage Measurement
LMPT – LTE Main Processing & Transmission Unit (in slot 7)LBBP – LTE BaseBand Processing Unit (First LBBP in Slot 3)
Measurement Object: Cabinet No.=0, Subrack No.=0, Slot No.=7
Measurement Object: Cabinet No.=0, Subrack No.=0, Slot No.=3
Slot No.=2Slot No.=1
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Related Counters
Page63
Counter ID Counter name Description
1526727013VS.Board.CPUload.Max
Maximum Board CPU Usage
1526727014VS.Board.CPUload.
MeanAverage Board CPU Usage
1526728332VS.Board.CPULoad.CumulativeHighloadCount
Number of Times that the CPU Usage of Boards
Exceeds the Preconfigured Threshold
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Resource Block Utilizing Rate
Page64
KPI name Resource Block Utilizing Rate
Measurement scope
Cell/Cluster
Formula
Unit Percentage(%)
%100_
__ DL ×=
DL
DL
AvailableRB
UsedRBURRB
%100_
__ UL ×=
UL
UL
AvailableRB
UsedRBURRB
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Associated Counters
� Average number of used downlink PRBs
� Measurement point: The number of used downlink PRBs in a cell
is sampled per second. At the end of a measurement period, the
average of these sampling results is used as the value of the
counter
� Average number of used uplink PRBs
� Measurement point: The number of PRBs over the PUCCH in a
cell is sampled per second .At the end of a measurement period,
the average of these sampling results is used as the value of the
counter.
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Radio Network Unavailability Rate
Page67
KPI name Radio Network Unavailability Rate
Measurement scope
Radio network (Cluster)
Formula
SP:indicates the report period of counters in minute
Unit Percentage(%)
%10060*}{*
__ x=∑
SPTheTotalNumberOfCellsInCluser
CellUnavailTimeRateUnavailRAN
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Contents
1. KPI Overview
2. Performance KPI
3. Driver test KPI
Page68
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Coverage Ratio
� Object : Coverage test (RSRQ & RSRP)
� Evaluation formula:
� Coverage radio = valid test kilometers / total test kilometers
� Standard:
� The valid test kilometers should be satisfied for RSRP ≥ -
110dBm,RSRQ ≥ -3dB
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� KPI category in EUTRAN
� KPI introduction
� Counter details
Page70
Summary
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Abbreviation
� ERAB: E-UTRAN Radio Access Bearer
� RRC: Radio Resource Control
� MRC: Maximum Ratio Combining
� PSIC: Parallel Soft Interference Cancellation
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