Introduction 3G Network KPIs (1)

8/11/2019 Introduction 3G Network KPIs (1)

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06.April 2006

HUAWEI TECHNOLOGIES CO., LTD.

www.huaw ei.com

Introduction to UMTSRadio KPI


www.huawei.com

Huawei Northwest Africa Region

RNP Solution Manage: William.chen

[email protected]

3G network planning introduce

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HUAWEI TECHNOLOGIES CO., LTD. Page 2

Agenda

n UMTS Radio KPI overview

n 3G Network Optimization

n Case Study of KPI Optimization

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3G KPIs Principle: S.M.A.R.T

S pecific the KPI has clear and complete definition andformula, include check point and procedure.

Measurable KPIs are measurable by given condition,measurement equipment and procedure.

Attainable all the KPIs should be reachable, it is refer to thecommercial network.

Relevant the KPI can show the subscriber experience

Time-bound the KPI target should be on the base of time-bound



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3G KPIs : Specific

Complete KPI definition include the fo rmula combine with the check point or

procedure .

The example: RRC Connection Successful Rate

100%ionAttemptRRCConnectionSuccessRRCConnect=RRCS_SR

service

serviceService

n formula

n Check point

The number of !RRC Connection A t temp t " is A1 or

A2?

A2 represent the effective number of !RRC

Connect ion At temp t ".



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n Field Test - > Drive Test

3G KPIs : Measurable Drive Test

Evaluate the overall networkperformance, usually on the networkpre-launch phase and initial stage ofcommercial launch.

Driver test route is based oncluster, it is involved about 20sites in one cluster usually.

Test platform

Multiple test modelUEs can performdifferent tests.

Data analysis

Probe & Assistant is usedfor analyzing test data



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n Field Test -> stationary Test

Evaluate the system / equipment performance.

3G KPIs : Measurable Stationary test

Core Network

RNC

NodeB

NodeB

System performance Radio Networkperformancen Equipment ability

n Transmissionn Network construct

n # .

n Radio networkplanning

n Special environmentcondition

System KPI is suggested to betest by stationary:

n Throughput KPI

n Delay KPI

n Quality KPI

Stationary test condition is fixed,and usually used in indoor testscenario .

Radio Network KPI test issuggested to be test by drive test

n Call drop rate

n Handover successful rate



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Monitoring & analysiscenter

Subscriber care center

Optimization team

Any corresponding dept.

Terminal: ordinary PC or laptop, no distancelimitation

Local networks

Nastarserver

Recommended for security

OM system

Essential

3G KPIs : Measurable Statistic test

n Statistic Test

There mu st be enough s tat ist ic sample, thatmean network t raff ic should b e reach highlevel.

Pre-Condition for Statistic Test



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MSC/SSP/VLR

HLR/AC

GMSC/SSP

PSTNPLMNISDN

iManagerTM M2000

GENEX Nastar 3G

GENEX Assistant3G

GENEX ProbeWCDMA

CN

Node B

Node B

Node B

RNC

RNC

Node B

Node B

Node B RNS

RNS

network pre-planning/planning

wireless test data

multiple test data

obtaining test data

p a r a m e t e r

o p t i m i z a t i o n f i l e s

v GENEX Probe

v AGILENT

v QUALCOMM

v HUAWEI RNC

comprehensive analysis of theperformance, configuration,alarm

GENEX U-Net

a u t o m a t i c d e l i v e r y

R N C t e s t d a t a

sharing ofanalysis results

Huawei KPI test platform



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Statistic / Measurement data

Examples of User Experience (QoE)

completion of adownload file

Voice, Video Phone, MMS, WAP, Email, FTP, HTTP !

AMR12.2, CS64k,PS64k/128k/384k, HSDPA/HSUPA

Accessibility Retainability Integrity Mobility Utilization Availability

End-to-end responseis fast

The voice and videois Clare

Service Performance

Radio Network KPI

3G KPIs: Relevant



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3G KPIs

Accessability Retainability Service Integrity Mobility Delay/Latency

$ Call SetupSuccess Rate(Voice/VP)

$ PDP ContextActivationSuccess Rate

$ SMS/MMSSuccess Rate

$ Call DropRate(Voice/VP)

$ PDPContextDrop Rate

$ PS Throughput $ SHOSuccessRate

$ HardHandoverSuccessRate

$ Inter-RATHandover

SuccessRate

$ Call Setup Delay(Voice/VP)

$ PDP ContextActivation Time

$ RTT

$ Worst CellRate

Availability

Huawei 3G KPIs Architecture



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ReasonableKPI target

Cos t

CompetitionCompetition

TechnicalTechnical

3G KPIs: Attainable

3G KPI is output of combination with investment include technology, HR,cost, competition strategy etc.

Huawei KPI comply principle:

n Huawei will be responsibility for every complied KPI;

n Cooperate with Mobilis to work out a Competitive KPI;

n Use the experience from other commercial network;

Attainable Attainable Common target for Mobilis and Huawei



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0 3 6 9 1 2

1 5

1 8

2 1

2 4

2 7

3 0

3 3

3 6

3 9

4 2

4 5

4 8

01020

30

4050

60

7080

90

100

Number of Sites

0 3 6 9 1 2

1 5

1 8

2 1

2 4

2 7

3 0

3 3

3 6

3 9

4 2

4 5

4 8

01020

3040

50

60

70

80

90

100

Number of Sites

n Ongoing Optimization

n Commercial Launch

n Pre-LaunchKPI Acceptance

n Mature Network

Nastar

Probe & Assistant

Drive Test KPIs Stationary test KPIs Network Statistics

Probe & Assistant

Drive Test KPIs

Stationary test KPIs

n Network construct Site verification

3G KPIs: Time-bound

Network Statistics Benchmark test

Probe & Assistant

E a c h K P I h a s

l i f e d u r a t i o n



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Recommend test methodology

Statistic TestDrive TestPS Call drop rate

Statistic Test-CS Call complete rate

-Drive TestRRC connection success rate

Statistic Test-PS Call Complete rate

StationaryStationaryR99 PS Throughput

StationaryStationaryHSPA Throughput

Statistic TestDrive TestSoft handover success rate

StationaryStationaryHSPA Call drop rate

Statistic TestDrive TestInter-RAT handover success

rate

Statistic TestDrive TestCS Call drop rate

Statistic TestDrive TestPDP activation success rate

Statistic TestDrive TestCall setup success rate

On-going OptimizationPre-launch AcceptanceTest Methodology



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Contents

$ UMTS Radio KPI overview

$ 3G Radio Network Optimization

$ Case Study of KPI Optimization



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Cons t ruc t i onphase

Troubleshooting

Booming phase Optimizing

Mature phase Balancing

Time

S u b s.N um

b er

RF plan review

Single site verification

Pre-launch optimization

KPIanalysis

ComplaintsDT & CQT

P r o b l e m

a n a l y

s i s

a n d r e s

o l u t i o

n

Customized anddifferentiated

services

Billing strategies

Drop call

Congestion

Poor quality

Access failure

##

$RF adjustment

$Para. adjustment$Maintenance and upgrade

$Contingency planning

$Network expansion

$ !! .

Investment Return

Commercia l launch

Optimization throughout Life Cycle



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Network Optimization Phases

RF optimization

Y

N

N

Y

Single site verification

80 sites in thecluster ready?

Service test andparameter optimization

Routine drive test andstats. analysis

Acceptance criteriasatisfied?

New site integrated

Optimization

preparation

Acceptance



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RF Optimization TargetRF Optimization Target

n To optimize coveragen To minimize pilot pollution

n To optimize cell dominance

nTo optimize neighbor cell list

n To resolve RF-related drop calls



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Pilot Pollution MinimizationPilot Pollution Minimization

-62 -64 -66 -68 -69

-81

-90

-85

-80

-75

-70

-65

-60

SC1 SC2 SC3 SC4 SC5 SC6

R S C P ( d B m

)

Active Set Pilot Pollution

Margin

NotPilot Pollution

Ways to optimize:(1) Antenna adjustment

(e.g. azimuth or down tilt)(2) Pilot power optimization

n SHO candidates (A)

n Active set size (B)

n If A>B, pilot pollution exists

Pilot pollution definition:

Pilot pollution will result in:(1) low signal quality(2) decreased system

capacity(3) Call drops easier



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Pilot Pollution: ExamplePilot Pollution: Example



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RF-related Drop CallsRF-related Drop Calls

n Poor coverage

n High interference

n Poor UL coverage

n Poor dominance

n Pilot pollution

n Missing neighbors

Problems

Fast chang e of RF cond it ion s usuallycauses dr op calls , e .g. turning a cor ner.

Poor RSCP & Ec/Io

Poor Ec/Io or RTWP

UE max Tx power

many SHO events

many cells present

Appearance



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Para. Optimization TargetPara. Optimization Target

n To reduce access failures

n To reduce drop calls

n To enhance service quality

Para. op timi zation

is an impor tant s tep

af ter RF opt im izat ion

Service quali ty and network resou rcesuti l ization w ill be impr oved after para.opt imizat ion



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Parameters to be OptimizedParameters to be Optimized

n CCCH power allocation para.

n RL maximum power para.

n Cell re-selection para.

nIntra-freq. handover para.

n Inter-RAT handover para.

n Power control para.

n Access power para.

n Other related para.

The inf luence caused by the

cel l parameters adjus tmentsho uld be analyzed carefu l ly.

Seldomadjusted

An effective way toreduce drop ca l ls



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Intra-freq. Re-selection Para.

Treselect ion, Qhy st2, Sintrasearch = 0

Optimize Treselect ion , Qhys t s and Sintrasearch so a s tohave min im um p ing-pong and m i n i m u m c am p e d o n t owrong ce ll

Qhys t2

Qhyst2

Qhyst2

Treselection Treselection Tr es e le c ti o n Tr es e le c ti o n

Qqualmin

CPICH_Ec/Io

The black dotted lineis the serving cells.UE doesn t camp

onto the best cells.

Treselect ion , Qhys t2, Sintrasearch != 0

Qqualmin

Sintrasearch

CPICH_Ec/Io

Time

The black dotted lineis the serving cells.

Qhyst2

Qhys t2

UE doesn t camponto the best cells.

Treselect ion Treselec t ion



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Contents

$ UMTS Radio KPI overview

$ 3G Radio Network Optimization

$ Case Study of KPI Optimization



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Case study from commercial projects

$ Example of Accessibility KPI analysis

$ Example of Call Drop KPI issue & solution

$ Example of Throughput KPI issue analysis



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Example of accessibility KPIs issue

Trouble-shoo t ing of RRCs e tu p an d R A B as s i g n m en t

p rob lems :$ STEP1 : Identify the counter with thehighest number

$ STEP2: Identify the Top 10 cells withthe same problem

VS.RAB.FailEstPS.RIPFail

VS.RAB.FailEstabCS.Other.Cell

VS.RAB.FailEstCS.IUB.Band

Breakdown of CS RAB failure (Counters)

Defin i t ion of Counters

l VS.RAB.FailEstPs.IUB.Band : The number ofRABs unsuccessfully established in a cell dueto IUB resource congestion causes.

RRC.FailConnEstab.

NoReply

VS.RRC.Rej.UL.C

E.Cong

VS.RRC.Rej.Cod

e.Cong

VS.RRC.Rej.R

L.Fail

Breakdown of CS RRC failure (Counters)

$ VS.RAB.FailEstabCS.Other.Cell :Pre-admission control module reportsa resource congestion.

$ VS.RRC.Rej.UL.CE.Cong : RRCsetup failure due to lack of UL CEresources



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148.96%132.29%132.29%158.33%0111TO

180.21%175.00%175.00%142.71%0109TO

171.88%132.29%132.29%120.83%0070TO

2007-02-222007-02-212007-02-202007-02-19

UL CE Occupation RateNodeBName

n 0109TO (cell id 578/579/580)n 0111TO (3882/3883/3884)n 0070TO (18641/18642/18643)

The w o r s t ! s i tes (ce l l s ) tha t have been foun d to have both IUB and CEconges t ion i s sues :

Analysis



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Suggested solution

97.81%(48854/49946)

98.80%(13638/13803)

83.10%(1981/2384)

98.67%(2891/2930)

98.09%(241127/245815)

99.35%(256449/258126)

KPIs (without IUB

Congestion sites)

97.53%(58114/59584)

98.48%(16674/16932)

84.93%(2462/2899)

98.31%(3314/3371)

97.79%(294499/301169)

99.17%(313992/316615)

KPIs (including IUB

Congestion sites)

PS384 RAB Assignment

Success Rate(>97%)

PS128 RAB Assignment

Success Rate(>97%)

PS64 RAB Assignment Success

Rate(>97%)

Video Call RAB Assignment

Success Rate(>98%)

AMR RAB Assignment SuccessRate(>98%)

RRC Connection Setup Success

Rate (CS)(>98%)

A c om para tive analys is sh ows tha t , i f excluding the problemat ic s i tes ,the KPI wo uld imp rove subs tant ia l ly, say, AMR RAB ass ignm ent successrate fro m 97.79% to 98.09%:

Sugges ted ac t ion p lan: $ CE/IUB expansion

$ Perform regular neighbour listcheck to further tune theperformance



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$ Example of Throughput KPI issue analysis



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AMR12.2 Call Drop Rate

0.0%

0.5%

1.0%

1.5%

2.0%

2.5%

3.0%

3.5%

2 0 0 6

- 0 1

- 1 6

2 0 0 6

- 0 1

- 1 8

2 0 0 6

- 0 1

- 2 0

2 0 0 6

- 0 1

- 2 2

2 0 0 6

- 0 1

- 2 4

2 0 0 6

- 0 1

- 2 6

2 0 0 6

- 0 1

- 2 8

2 0 0 6

- 0 1

- 3 0

2 0 0 6

- 0 2

- 0 1

2 0 0 6

- 0 2

- 0 3

2 0 0 6

- 0 2

- 0 5

2 0 0 6

- 0 2

- 0 7

2 0 0 6

- 0 2

- 0 9

2 0 0 6

- 0 2

- 1 1

2 0 0 6

- 0 2

- 1 3

2 0 0 6

- 0 2

- 1 5

2 0 0 6

- 0 2

- 1 7

2 0 0 6

- 0 2

- 1 9

2 0 0 6

- 0 2

- 2 1

2 0 0 6

- 0 2

- 2 3

2 0 0 6

- 0 2

- 2 5

2 0 0 6

- 0 2

- 2 7

2 0 0 6

- 0 3

- 0 1

2 0 0 6

- 0 3

- 0 3

2 0 0 6

- 0 3

- 0 5

2 0 0 6

- 0 3

- 0 7

2 0 0 6

- 0 3

- 0 9

2 0 0 6

- 0 3

- 1 1

2 0 0 6

- 0 3

- 1 3

2 0 0 6

- 0 3

- 1 5

2 0 0 6

- 0 3

- 1 7

2 0 0 6

- 0 3

- 1 9

Drop Call Rate Voice(3G)

Drop Call Rate Video(3G)Drop Call Rate (2G)

Example of Call drop rate issues

Voice call drop ratechanges over a three-

month optimization period

Zone1 Zone2Zone3Solving Voice call drop

rate problems in Top 3 zones



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What measures were taken to solvethe call drop problems?

1.34%->1.10%Mar.2-6Zone 3

1.38%->1.21%Feb. 23-25Zone 2

Scrambling code planningadjustment System/handoverparameter tuning Neighbour list optimization RF optimization, etc.

1.57%->1.27%Feb. 14-17Zone 1

Optimization measuresCall drop ratereduction

Action timeZone



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$ Example of Throughput issue analysis



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45 Huawei sitesprovide coveragefor DT route(Madrid SouthEast)

Example of throughput KPI issues

2808787> 384 Kbit/sHSDPAMinimum applicationthroughput DL

319 (UL)

293 (DL)

118 (UL)

87 (DL)

118 (UL)

87 (DL)

UL > 300 kbps

DL > 361 kbps

I/B PSUL:384DL:384

FTP application

throughput

KPISuccessfulValid callsTargetServiceGroup



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RNC 123

RNC 122

RNC 121

Areas that lackdominant pilot

Analysis: coverage problems

Drive test routeinvolves 3 HuaweiRNCs and 1 NortelRNC



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DL R99 throughput has been impacted by the interference generated by missingneighbors, mostly concerning the new sites that had been recently put on air

Areas with low throughput corresponds to bad Ec/Io figures and HHO to 2G

The impact of missing neighbours

Low throughput

UE handover to GSM



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In addition to coverage and missing neighbour causes, the HSDPAminimum throughput problem is due to:

$ DT route crosses the IUR area where HSDPA calls are reconfigured to DCH(H2D)

$ UE moves from a non-hotspot to a hotspot site in HSDPA connected mode

RNC 123 RNC 122

RNC 121

RNC 123RNC 122

RNC 121

Other causes



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06.April 2006


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Thank You

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Documents

Introduction 3G Network KPIs (1)