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WCDMA KPI Introduction

ISSUE 1.0
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l Key performance indicators (KPIs) are a set

of selected indicators used for measuring the current network performance and trends.
l KPIs highlight the key factors of network

monitoring and warn in time of potential problems.

l KPIs are also used to prioritize the

corrective actions.

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l Upon completion of this course, you will be able to:

[ Describe the definitions of KPI [ List the important KPIs and their benchmarks

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Overview
KPI Categories Access success rate RAB Setup Success Rate Voice Call Drop Rate Call drop rate VP Call Drop Rate PS Call Drop Rate Soft Handover Success Rate Inter-Frequency HO Success Rate Intra-Frequency HO Success Rate Mobility management CS InterRAT HO Success Rate PS InterRAT HO Success Rate Cell Update Success Rate Equivalent User Traffic volume Cell Throughput Cell Resource Allocation
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KPI RRC Setup Success Rate

Overview
Daily report
KPI Traffic CS User Based on Equivalent User PS User Based on Equivalent User RRC)(>95%) RRC Connection Setup Success Rate (other)(>95%) AMR RAB Assignment Success Rate(>95%) Access Video Call RAB Assignment Success Rate(>95%) PS RAB Assignment Success Rate(>95%) RB Setup Success Rate(>95%) Values 15.34(11:00 ~ 12:00) 92.47(15:00 ~ 16:00) 98.97%(9396/9494) 96.02%(39688/41334) 99.73%(4726/4739) 99.24%(130/131) 99.12%(3148/3176) 99.74%(8004/8025)

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Overview
Daily report
KPI Soft Handover Success Rate(>98%) Softer Handover Success Rate(>98%) Soft Handover Factor based on Radio Link Number(<40%) HO Inter-Freq Hard Handover Success Rate(>85%) CS Inter-RAT Handover Success Rate( from UTRAN to GSM)(>85%) PS Inter-RAT Handover Success Rate( from UTRAN to GSM)(>85%) CS AMR Call Drop Rate(<1.5%) CDR Video Call Drop Rate(<1.5%) PS Service Drop Rate(<30%) Values 99.88%(123452/123595) 99.91%(18522/18538) 48.21% 99.29%(139/140) 100.00%(53/53) 83.33%(5/6) 1.54%(73/4726) 0.77%(1/130) 2.13%(67/3148)

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Chapter 1 Coverage KPI Chapter 2 Accessibility KPI Chapter 3 Retainability KPI Chapter 4 Mobility KPI Chapter 5 HSDPA KPI Chapter 6 Other Available KPI

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Coverage KPI
l UL Interference Cell Ratio
TheNumberO fCells ,Which MeanRTWP > 98 dBm 100 % TheTotalNu mberOfCell sInRNC

[ Calculation formula: ULICR = [ Notes:

-98dBm is referred by the experience from commercial network In KPI reports, UL interference level should be given by cells ID

[ Description:
This KPI can be used to evaluate how serious the UL capacity is limited by the UL interference of all cells in one RNC

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Coverage KPI
l Soft Handover Ratio

[ Calculation formula: SHR =

is number of UE with 3 RLs

A1 1 + B1 2 + C1 3 1 100% A1 + B1 + C1

where A is number of UE with 1 RL, B is number of UE with 2 RLs, and C

[ Description:
This KPI can be used to evaluate the consumption to network resources due to soft handover in one RNC The benchmark can be different with the different network stage

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Coverage KPI
l Other performance indicators can also show the network coverage

problems, such as
[ RRC connection failure caused by no RRC connection setup complete [ SHO failure caused by no Active set update complete [ Call drop caused by SRB reset [ No response for RB setup [ No response for RB reconfiguration
l Description

[ Most indicators mentioned above should be given be cell ID [ The cells which most failures happens in should be taken into consideration in coverage problems

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Summary

Summary

This chapter mainly explained the KPIs about coverage [ UL Interference Cell Ratio [ Soft Handover Ratio

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Chapter 1 Coverage KPI Chapter 2 Accessibility KPI Chapter 3 Retainability KPI Chapter 4 Mobility KPI Chapter 5 HSDPA KPI Chapter 6 Other Available KPI

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Accessibility KPI
l UTRAN Call Setup mainly includes

[ RRC connection setup [ RAB establish procedure

l Call setup success rate includes

[ Radio Access Success Rate [ RRC Setup Success Rate [ RAB Setup Success Rate

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Accessibility KPI
RRC connection setup
l Measurement Point

[ Stat. Number of RRC Connection Request in Point A1 of Figure1 [ Stat. Number of RRC Connection Setup in Point B of Figure1 [ Stat. Number of RRC Connection Setup complete in Point C of Figure1 [ Stat. Number of RRC Connection Reject in point A of Figure2
UE RRC CONNECTION REQUEST RNC

A1 A2
RRC CONNECTION SETUP

UE RRC CONNECTION REQUEST

RNC

B
RRC CONNECTIONREJECT
RRC CONNECTION SETUP COMPLETE

F1:successful RRC connection setup procedure

F2: RRC connection reject procedure

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Accessibility KPI
RRC connection setup
l Formula of RRC Setup Success Rate

[ For service [ For other

l Main counter

RRCS _ SRService =

RRCConnectionSuccessservice 100% RRCConnectionAttemptservice

RRCS _ SRother =

RRCConnect ionSuccess other 100 % RRCConnect ionAttempt other

[ RRC Connection Request [ RRC Connection Setup [ RRC Connection Setup complete

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Accessibility KPI
RAB setup l Measurement Point
[ Stat. Number of RAB Setup Request in Point A of Figure1 [ Stat. Number of RAB Setup Success in Point B of Figure1 [ Stat. Number of RAB Setup Failure in Point B of Figure2
UE RNC CN RAB ASSIGNMENT REQUEST
UE RNC RAB ASSIGNMENT REQUEST A RADIO BEARER SETUP RADIO BEARER SETUP FAILURE RAB ASSIGNMENT RESPONSE B CN

A
RADIO BEARER SETUP RADIO BEARER SETUP COMPLETE

B
RAB ASSIGNMENT RESPONSE

F1: Successful RAB setup procedure

F2: RAB setup failure procedure

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Accessibility KPI
RAB setup
l CS RAB Setup Success Ratio

[ Calculation formula : [ Description

CSRABS _ SR =

CSRABSetup Success 100 % CSRABSetup Attempt

This value can be divided into voice service and VP service

l PS RAB Setup Success Ratio

[ Calculation formula : [ Description:

PSRAB _ SR =

PSRABSetup Success 100 % PSRABSetup Attempt

This KPI can be used to evaluate the RAB setup success ratio of all PS service in one RNC

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Accessibility KPI
l Radio Access Success Rate

[ Calculation formula
RA _ SR = RRCS _ SR Service ( CSRABSetup Suc PSRABSetup Suc ) 100 % CSRABSetup Att PSRABSetup Atte

[ Description
A complete call setup procedure contains the RRC, Direct Transfer procedure and RAB. This KPI can be used to evaluate the radio access success ratio in one RNC

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Summary

Summary

l This chapter mainly explained the KPIs

about Accessibility [ RRC connection success rate [ RAB setup success rate [ Radio access success rate

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Chapter 1 Coverage KPI Chapter 2 Accessibility KPI Chapter 3 Retainability KPI Chapter 4 Mobility KPI Chapter 5 HSDPA KPI Chapter 6 Other Available KPI

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Retainability KPI
l Measurement Point

[ Stat. Number of Call Drop in Point A of Figure1 and in Point A of Figure2 [ Definition of Call Drop : Abnormal RAB release triggered by RNC
RNC CN
RNC CN IU RELEASE REQUEST

RAB RELEASE REQUEST A

A

IURELEASE COMMAND IU RELEASE COMPLETE

F1: RAB release request procedure

F2: Iu connection release request procedure

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Retainability KPI
l CS Service Drop Ratio

[ Calculation formula: CS _ CDR = [ Description:

CSRABAbnormal Re lease 100% CSRABSetupSuccess

This KPI can be used to evaluate the call drop ratio of CS service in one RNC. The call drops will happen due to RNC abnormal release trigged by RAB RELEASE REQUEST or IU RELEASE REQUEST messages AMR service drop ratio and VP service drop ration can represent the problems in details if possible

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Retainability KPI
l PS Service Drop Ratio

PSRABAbnor Re lease mal 100% [ Calculation formula: PS _ CDR = PSRABSetupSuccess [ Description:

This KPI can be used to evaluate the call drop ratio of all PS service in one RNC The call drops happened due to RNC abnormal release trigged by RAB RELEASE REQUEST or IU RELEASE REQUEST messages

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Summary

Summary

l This chapter mainly explained the KPIs

about retainability [ CS Service Drop Ratio [ PS Service Drop Ratio

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Chapter 1 Coverage KPI Chapter 2 Accessibility KPI Chapter 3 Retainability KPI Chapter 4 Mobility KPI Chapter 5 HSDPA KPI Chapter 6 Other Available KPI

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Mobility KPI
l Soft Handover Success Ratio

[ Measurement Point:
UE MEASUREMENT REPORT A ACTIVE SET UPDATE B ACTIVE SET UPDATE COMPLETE C RNC

UE MEASUREMENT REPORT A ACTIVE SET UPDATE B ACTIVE SET UPDATE FAILURE C

RNC

UE MEASUREMENT REPORT A ACTIVE SET UPDATE B WAITING ACTIVE SET UPDATE COMPLETE TIME OUT C

RNC

l F1: Successful SHO procedure

F2: SHO failure procedure

F3:SHO failure procedure

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Mobility KPI
l Soft Handover Success Ratio

[ Calculation formula: SHO _ SR = [ Description:

SHOActiveS etUpdateSu ccess 100 % SHOActiveS etUpdateAt tempt

This KPI can be used to evaluate the soft handover success ratio in one RNC, which includes softer handover This SHO events contain 1A, 1B and 1C.

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Mobility KPI
l Softer Handover Success Ratio

[ Calculation formula: SoHO _ SR = [ Description:

SofterHOAc tiveSetUpd ateSuccess 100 % SofterHOAc tiveSetUpd ateAttempt

This KPI can be used to evaluate the softer handover success ratio in one RNC. This SHO events contain 1A, 1B and 1C.

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Mobility KPI
l Inter-frequency Hard Handover Success Ratio

[ Measurement points
NodeB (new) UE NodeB (old) MEASUREMENT REPORT(2D Event) A Compress mode MEASUREMENT Control(2D Event) MEASUREMENT REPORT (several) RADIO LINK SETUP REQUEST RADIO LINK SETUP RESPONSE PHYSICAL CHANNEL PHYSICAL CHANNEL RECONFIGURATION PHYSICAL CHANNEL RECONFIGURATION COMPLETE B C RNC

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Mobility KPI
l Inter-frequency Hard Handover Success Ratio

[ Calculation formula: [ Description:

InterHHO _ SR =

InterHHOSuccess 100% InterHHOAttempt

This KPI can be used to evaluate the inter-frequency hard handover success ratio in one RNC

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Mobility KPI
l Intra-frequency Hard Handover Success Ratio

[ Intra-frequency Hard Handover signaling procedure

UE NodeB (new) MEASUREMENT REPORT (1D Event) A RADIO LINK SETUP REQUEST RADIO LINK SETUP RESPONSE PHYSICAL CHANNEL RECONFIGURATION PHYSICAL CHANNEL RECONFIGURATION COMPLETE B RNC

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Mobility KPI
l Intra-frequency Hard Handover Success Ratio

[ Calculation formula: IntraHHO _ SR = [ Description:

HHOSuccess InterHHOSuccess 100% HHOAttempt InterHHOAttempt

This KPI can be used to evaluate the intra-frequency hard handover success ratio in one RNC These counters do not contain RAT hard handover

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Mobility KPI
l CS Inter-RAT Handover Success Ratio (WCDMA to GSM)

[ Inter-RAT Handover measurement counter:

Handover outgoing attempt in Point C Handover outgoing success in Point D
UE SRNC RELOCATION REQUIRED CN

A
RELOCATION COMMAND HANDOVER FROM UTRAN COMMAND

B C
IU RELEASE COMMAND

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Mobility KPI
l CS Inter-RAT Handover Success Ratio (WCDMA to GSM)

[ Calculation formula: CSInterRAT HO _ SR = [ Description:

CSInterRAT HOSuccess 100% CSInterRAT HOAttempt

This KPI can be used to evaluate the CS inter-RAT handover success ratio in one RNC

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Summary

Summary

This chapter mainly explained the KPIs about mobility [ Soft handover success ratio [ Softer handover success ratio [ Inter-frequency hard handover success ratio [ Intra-frequency hard handover success ratio [ CS Inter-RAT hard handover success ratio

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Chapter 1 Coverage KPI Chapter 2 Accessibility KPI Chapter 3 Retainability KPI Chapter 4 Mobility KPI Chapter 5 HSDPA KPI Chapter 6 Other Available KPI

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HSDPA KPI
Traffic Statistic
l HSDPA Access KPI

[ RRC setup success rate [ RAB Assignment success rate

l HSDPA Handover KPI

[ Success rate of H-H intra-frequency serving cell change [ Success rate of H-H inter-frequency serving cell change [ Success rate of H-R99 intra-frequency handover [ Success rate of H-R99 inter-frequency handover [ Success rate of H-GPRS intra-RAT handover
l HSDPA Call Drop rate

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HSDPA KPI
Drive Test
l Service throughput

[ HSDPA single subscriber downlink average throughput at cell center [ HSDPA single subscriber downlink average throughput at cell edge [ Test at stationary point

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Chapter 1 Coverage KPI Chapter 2 Accessibility KPI Chapter 3 Retainability KPI Chapter 4 Mobility KPI Chapter 5 HSDPA KPI Chapter 6 Other Available KPI

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Other Available KPI

l VIP cells performance

[ The following items should be taken more consideration

RRC setup success rate RTWP value Transmission power Call drop rate

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Other Available KPI

l Worst Cell Ratio (WCR)

[ Calculation formula:
WCR = TheNumberO fCells , which ( A1andA 2 < 95%) or ( B1andB 2 > 3%) 100 % TheTotalNu mberOfCell sInRNC

[ Description:
A1 is AMR RAB Setup Success Ratio, A2 is VP RAB Setup Success Ratio B1 is AMR Call Drop Ratio, B2 is VP Call Drop Ratio 95% and 3% are referred by the experience from commercial network while the traffic with AMR voice and video phone is bigger than 0.1 Erlang This KPI can be used to evaluate the effect of cells with poor call drop rate or call setup success rate to the deteriorating of network performance in one RNC

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Summary

Summary

l This course introduces WCDMA network KPIs,

including [ Coverage KPIs [ Accessibility KPIs [ Retainability KPIs [ Mobility KPIs

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Thank you
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