4G key performance indicators for planning and optimization

Copyright © 2013 Huawei Technologies Co., Ltd. All rights reserved. Page0
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Course Code Product Product Version Course Version ISSUE
OEO207010 LTE eRAN6.0 1.00
Developer/Modifier Time Approver New/Update
Yuanshuai 2013-4 Zhu Dianrong Update from eRAN3.0

www.huawei.com
Copyright © 2013 Huawei Technologies Co., Ltd. All rights reserved.
LTE eRAN6.0 KPI Introduction

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
Page2

Contents
1. KPI Overview
2. Performance KPI Details
3. Driver test KPI
Page3

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.
Page4

eRAN Performance KPI Overview
Page5
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

Measurement KPI - Attributes
Description
Measurement
Scope
Formula
Associated
Counters
Measurement KPI
KPI name

Performance Measurement System
Page7
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
…… ……

Performance Measurement Counter

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
Page9

Contents
2. KPI Details
2.1.1 RRC Setup Success Rate
2.2.2 E-RAB Setup Success Rate
2.2.3 Call Setup Success Rate
Page10

RRC Connection Cause
Page11
RRC Connection
UE - eNB
RRC causes:
MO signaling (Signaling)
MO data (Service)
MT access (Service)
Emergency (Service)
High Priority Access

RRC Setup Success Rate
Page12
KPI name RRC Setup Successful Rate
Measurement scope Cell/Cluster
Formula
Unit Percentage(%)
%
100
_ 

ionAttempt
RRCConnect
ionSuccess
RRCConnect
SR
RRC

Associated Counters
Page13

RRC Setup Failure Reason
 Possible reason:
 Resource allocation failure (admission failure)
 No response from UE ( Poor coverage or terminal problem)
Page16
Figure 1 Figure 2

Contents
2. KPI Details
2.1.1 RRC Success Rate
2.2.2 E-RAB Success Rate
Page17

Radio Access Bearer (E-RAB)
SGW
E-RAB
UE - SGW
User-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

E-RAB Setup Success Rate (VoIP)
Page19
KPI name ERAB Setup Success Rate (VoIP)
Formula
Unit Percentage(%)
%
100
_ 

tupAttempt
VoIPERABSe
tupSuccess
VoIPERABSe
SR
VoIPERABS
 VoIP is related with QCI 1 bearer

E-RAB Setup Success Rate (All Service)
Page20
KPI name ERAB Setup Success Rate (All service)
Formula
Unit Percentage(%)
%
100
_ 

ttempt
ERABSetupA
uccess
ERABSetupS
SR
ERABS

Associated Counters – Initial E-RAB Setup
Page21
L.E-RAB.IntialAttEst.QCI.x
L.E-RAB.InitialSuccEst.QCI.x

Associated Counters – Dedicated E-RAB
Setup
Page23
L.E-RAB.AttEst.QCI.x
L.E-RAB.SuccEst.QCI.x

Contents
2. KPI Details
2.1.1 RRC Setup Success Rate
2.2.2 E-RAB Success Rate
Page26

Call Setup Success Rate
Page27
KPI name Call Setup Success Rate
Measurement
scope
Cell/Cluster
Formula
Unit Percentage(%)
%
100
1
1




ttemp
ERABSetupA
ucess
ERABSetupS
shAttempt
ionEstabli
SigConnect
S
shSuccess
ionEstabli
SigConnect
S
ionAttempt
RRCConnect
ionSuccess
RRCConnect
CSSR
service
service

Counters For S1 Dedicated Signaling
Setup
Page28
L.S1Sig.ConnEst.Att
L.S1Sig.ConnEst.Succ

Contents
2. KPI Details
2.3 Mobility KPIs
2.4 Equipment Related
2.5 Utilization KPIs / Traffic KPI
2.6 Transport Performance Counter
Page29

VoIP Call Drop Rate
Page30
KPI name VoIP call drop rate
Formula
Unit Percentage(%)
%
100
Re
Re
_ 

lease
VoIPERAB
lease
normal
VoIPERABAB
CDR
VoIP

Service Drop Rate (All)
Page31
KPI name ERAB drop rate
Formula
Unit Percentage(%)
%
100
Re
Re
_ 

lease
ERAB
lease
al
ERABABnorm
CDR
Service

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
Page32

Abnormal Release
Page33
Figure 1 Figure 2
Figure 3 Figure 4
L.E-RAB.AbnormalRel.QCI.x

Normal Release
Page36
Figure 1
Figure 2
L.E-RAB.NormalRel.QCI.x

Contents
2. KPI Details
2.3 Mobility KPIs
2.5 Utilization/Availability KPIs / Traffic KPI
Page39

Intra/Inter-frequency Handover Out Success
Rate
Page40
KPI name Intra/Inter-frequency Handover Out Success Rate
Formula
Unit Percentage(%)
%
100
_ 

t
OOutAttemp
IntraFreqH
s
OOutSucces
IntraFreqH
SR
OOut
IntraFreqH
%
100
_ 

t
OOutAttemp
InterFreqH
s
OOutSucces
InterFreqH
SR
OOut
InterFreqH
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

Associated Counters (Intra eNB)
Page41
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,

Associated Counters (Inter eNB)
X2 Based Handover
Page42
Handover Based on X2 interface
L.HHO.IntereNB.IntraFreq.ExecAttOut
L.HHO.IntereNB.InterFreq.ExecAttOut
L.HHO.IntereNB.IntraFreq.ExecSuccOut
L.HHO.IntereNB.InterFreq.ExecSuccOut

Associated Counters (Inter eNB)
S1 based Handover
Page43
Handover Based on S1 interface
L.HHO.IntereNB.IntraFreq.ExecAttOut
L.HHO.IntereNB.InterFreq.ExecAttOut
L.HHO.IntereNB.IntraFreq.ExecSuccOut
L.HHO.IntereNB.InterFreq.ExecSuccOut

Handover In Success Rate
Page45
KPI name Handover In Success Rate
Formula
Unit Percentage(%)
%
100
_ 

t
HOInAttemp
s
HOInSucces
SR
HOIn

Associated Counters (Intra eNB)
Page46
L.HHO.IntraeNB.ExecAttIn
L.HHO.IntraeNB.ExecSuccIn

Related Counters (Inter eNB)
X2 Handover
Page47
Handover Based on X2 interface
L.HHO.IntereNB.ExecAttIn
L.HHO.IntereNB.ExecSuccIn

Related Counters (Inter eNB)
S1 Handover
Page48
Handover Based on S1 interface
L.HHO.IntereNB.ExecAttIn
L.HHO.IntereNB.ExecSuccIn

Inter_RAT Handover Out Success Rate
(LTE to WCDMA)
Page50
KPI name Inter-RAT Handover Out Success Rate (LTE to WCDMA)
Formula
Unit Percentage(%)
%
100
_
2
_
_
2
_
_
2
_ 

Attempt
W
E
IRATHO
Success
W
E
IRATHO
SR
W
E
IRATHO

Associated Counters
Page51
L.IRATHO.E2W.ExecAttOut
L.IRATHO.E2W.ExecSuccOut

Inter_RAT Handover Out Success Rate
(LTE to GSM)
Page52
KPI name Inter-RAT Handover Out Success Rate (LTE to GSM)
Formula
Unit Percentage(%)
%
100
_
2
_
_
2
_
_
2
_ 

Attempt
G
E
IRATHO
Success
G
E
IRATHO
SR
G
E
IRATHO

Associated Counters
Page53
L.IRATHO.E2G.ExecAttOut
L.IRATHO.E2G.ExecSuccOut

Contents
2. KPI Details
2.3 Mobility KPIs
2.5 Utilization/Availability KPIs / Traffic KPI
Page55

Cell Downlink Average Throughput
Page56
KPI name Downlink Average Throughput
Formula
Unit bps
sferTime
CellDLTran
ficVolume
CellDLTraf
hp
CellDLAveT 

Related Counter - DL Traffic Volume
Page57
 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.

Related Counter – DL Transmission Time
Page58
 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.
 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.

Cell Uplink Average Throughput
Page59
KPI name Downlink Average Throughput
Formula
Unit bps
sferTime
CellULTran
ficVolume
CellULTraf
hp
CellULAveT 

Related Counter - UL Traffic Volume
Page60
 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.
 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

Related Counter – UL Receiving Time
Page61
 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.
 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

Contents
2. KPI Details
2.3 Mobility KPIs
2.5 Utilization/Availability KPIs
Page62

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.=2
Slot No.=1

Related Counters
Page64
Counter ID Counter name Description
1526727013
VS.Board.CPUload.Ma
x
Maximum Board CPU Usage
1526727014
VS.Board.CPUload.Me
an
Average Board CPU Usage
1526728332
VS.Board.CPULoad.Cu
mulativeHighloadCoun
t
Number of Times that the CPU
Usage of Boards Exceeds the
Preconfigured Threshold

Resource Block Utilizing Rate
Page65
KPI name Resource Block Utilizing Rate
Measurement
scope
Cell/Cluster
Formula
Unit Percentage(%)
%
100
_
_
_ DL 

DL
DL
Available
RB
Used
RB
UR
RB
%
100
_
_
_ UL 

UL
UL
Available
RB
Used
RB
UR
RB

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.
Page66

Radio Network Unavailability Rate
Page68
KPI name Radio Network Unavailability Rate
Measurement
scope
Radio network (Cluster)
Formula
SP:indicates the report period of counters in minute
Unit Percentage(%)
%
100
60
*
}
{
*
_
_ x


SP
TheTotalNumberOfCellsInCluser
CellUnavailTime
Rate
Unavail
RAN

Contents
1. KPI Overview
2. Performance KPI
3. Driver test KPI
Page69

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
Page70

 KPI category in EUTRAN
 KPI introduction
 Counter details
Page71
Summary

Abbreviation
 ERAB: E-UTRAN Radio Access Bearer
 RRC: Radio Resource Control
 MRC: Maximum Ratio Combining
 PSIC: Parallel Soft Interference Cancellation
Page72

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