UMTS_OPTIMISATION

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Introduction toUMTS Radio

KPI3G network planning introducewww.huawei.com

Huawei Northwest Africa RegionRNP Solution Manage:

William.chen

[email protected] TECHNOLOGIES CO., LTD.

PDF created with pdfFactory Pro trial version www.pdffactory.com



Agenda

UMTS Radio KPI overview

3G Network Optimization

Case Study of KPI Optimization

HUAWEI TECHNOLOGIES CO., LTD. Page 2




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

the KPI has clear and complete definition andSpecific

formula, include check point and procedure. KPIs are

measurable by given condition, Measurable

measurement equipment and procedure. all the KPIs should

be reachable, it is refer to the Attainable

commercial network.

Relevant the KPI can show the subscriber experience

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





3G KPIs : Specific

Complete KPI definition include the formula combine with the check

point or procedure.

The example: RRC Connection Successful Rate

formula

RRCConnect ionSuccessserviceRRCS_SR = ×100%Service RRCConnect ionAttempt

service

Check point

The number of “RRC Connection Attempt” is A1

or A2?

A2 represent the effective number of

“RRC Connection Attempt”.





3G KPIs : Measurable - Drive Test

Driver test route is based on Field Test -> Drive Testcluster, it is involved about 20

Evaluate the overall network sites in one cluster usually.

performance, usually on the network

pre-launch phase and initial stage

of commercial launch.

Test platform

Multiple test model

UEs can perform

different tests.

Data analysis

Probe & Assistant is usedfor analyzing test data





3G KPIs : Measurable - Stationary test

System KPI is suggested to be Field Test ->stationary Test

test by stationary:

Evaluate the system / equipment performance. Throughput KPI

Delay KPI

Quality KPI

Core NetworkStationary test condition is fixed,

NodeB and usually used in indoor test

scenario.

RNC

NodeB Radio Network KPI test is

suggested to be test by drive testSystem performance Radio Network

performance Call drop rateEquipment ability

Handover successful rateRadio networkTransmission planning

Network constructSpecial environment

…. condition





3G KPIs : Measurable - Statistic test

Statistic Test

Nastar

server

Monitoring & analysiscenter

Recommended for securityEssential

Optimization teamOM system

Pre-Condition for Statistic TestSubscriber care center

There must be enough statistic sample, thatTerminal: ordinary PC or laptop, no distance

mean network traffic should be reach highlimitationlevel.

Local networksAny corresponding dept.





Huawei KPI test platform

comprehensive analysis of theiManagerTM M2000performance, configuration,

alarm obtaining test data

GENEX Nastar 3G

sharing of

analysis results Node B

RNC GENEX Probe

GENEX Assistant AGILENT 3G Node B

QUALCOMM HLR/ACmultiple test data

HUAWEI RNCNode B

RNS

PSTNGENEX ProbeMSC/SSP/ PLMN

WCDMAwireless test data ISDNVLRNode B

RNCGMSC/SSP

CNGENEX U- Node B

Net

Node B RNS

network pre-planning/planning





3G KPIs: RelevantExamples of User Experience (QoE)

completion of a End-to-end response The voice and video

download file is fast is Clare

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

Service Performance

Radio Network KPIAMR12.2, CS64k,PS64k/128k/384k, HSDPA/HSUPA

Accessibility Retainability Integrity Mobility Utilization Availability

Statistic / Measurement data





Huawei 3G KPIs Architecture

3G KPIs

Accessability Retainability Service Integrity Mobility Delay/Latency Availability

• Call Setup • Call Drop • PS Throughput • SHO • Call Setup Delay • Worst CellSuccess Rate Rate Success (Voice/VP) Rate

(Voice/VP) (Voice/VP) Rate• PDP Context

• PDP Context • PDP • Hard Activation TimeActivation Context Handover

• RTTSuccess Rate Drop Rate Success

Rate• SMS/MMSSuccess Rate • Inter-RAT

Handove

r SuccessRate





3G KPIs: It is not only a value

3G KPI is not only a value, but a system, for example of CDR (Call Drop Rate)

Network Planning Network Construct Transmission optimization

Root cause drop-call

cause59.45% 10.02% 7.29% 4.56% 0.68% 0.68% 3% 2.28% 11.94%





3G KPIs: Attainable

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

Huawei KPI comply principle:

Huawei will be responsibility for every complied KPI;le

Cooperate with Mobilis to work out a Competitive KPI; t Use the experience from other commercial network;

Technical AttainableCommon target for Mobilis and Huawei





3G KPIs: Time-boundMature Network

1090

80

Drive Test KPIs 7060

50Ongoing Optimization4030

Stationary test KPIs 2010

Number ofSitesNumberof Sites Network Statistics

Network StatisticsCommercial Launch Benchmark test

Nastar Probe & Assistant

Probe & Assistant

Pre-LaunchProbe & AssistantKPI Acceptance

Drive Test KPIs

Stationary test KPIs

Network construct Site verification





Recommend test methodology

Test Methodology Pre-launch Acceptance On-going Optimization

RRC connection success rate Drive Test -

Call setup success rate Drive Test Statistic Test

PDP activation success rate Drive Test Statistic Test

CS Call drop rate Drive Test Statistic Test

PS Call drop rate Drive Test Statistic Test

CS Call complete rate - Statistic Test

PS Call Complete rate - Statistic Test

HSPA Call drop rate Stationary Stationary

R99 PS Throughput Stationary Stationary

HSPA Throughput Stationary Stationary

Soft handover success rate Drive Test Statistic Test

Inter-RAT handover success Drive Test Statistic Test

rate





Contents

• UMTS Radio KPI overview •3G

Radio Network Optimization •






Optimization throughout Life Cycle

•RF adjustmentDrop call

•Para. adjustmentCongestion

•Maintenance and upgradePoor quality

•Contingency planningAccess failure

•Network expansionPre-launch optimization……

•…….

Customized anddifferentiatedservices

Single site verificationBilling strategies

ReturnInvestment

RF plan review DT & CQT KPI Complaintsanalysis

ConstructionBooming phase Mature phase TimeCommercia

phaseOptimizing Balancingl launch Troubleshooting





Network Optimization Phases

Optimization

preparation RF optimization

Service test andNew site integratedparameter optimization

Routine drive testand stats.analysis

Single site verification

Acceptance criteriaN satisfied?

Y80％ sites inthe Y

N cluster ready?

Acceptance





RF Optimization Target

To optimize coverage To

minimize pilot pollution To

optimize cell dominance To

optimize neighbor cell list To

resolve RF-related drop calls





RF Parameters Optimization

Engineering parameters adjustment

To adjust antenna down tilt

To adjust antenna azimuth

To adjust antenna location

To adjust antenna height To

replace antenna To replace

site To add new cell

Radio part parameters adjustment

To optimize neighbor cell list





Pilot Pollution Minimization

Pilot pollution definition:

Pilot pollution will result in: SHO candidates (A)(1) low signal quality

Active set size (B)(2) decreased system

If A>B, pilot pollution exists capacity

(3) Call drops easier

-60

-65Margin

-70Ways to optimize:

(1) Antenna adjustment-75 -62 -64 -66 (e.g. azimuth or down tilt)-68 -69-80

(2) Pilot power optimization

-85 -81

-90

SC1 SC2 SC3 SC4 SC5 SC6

NotActive Set Pilot PollutionPilot Pollution





Pilot Pollution: Example





RF-related Drop Calls

Problems Appearance

Poor coverage Poor RSCP & Ec/Io

High interference Poor Ec/Io or RTWP

Poor UL coverage UE max Tx power

Poor dominance many SHO events

Pilot pollution many cells present

Missing neighbors

Fast change of RF conditions usuallycauses drop calls, e.g. turning acorner.





Para. Optimization Target

Para. optimization To reduce access failuresis an important step

after RF optimization To reduce drop calls

To enhance service quality

Service quality and networkresources utilization will be improvedafter para. optimization





Parameters to be Optimized

CCCH power allocation para.

RL maximum power para.Seldom

adjusted Cell re-selection para.

Intra-freq. handover para.

An effective way to Inter-RAT handover para. reduce drop calls

Power control para.

Access power para. The influence caused by the

cell parameters adjustment Other related para. should be analyzed carefully.





Intra-freq. Re-selection Para.

Optimize Treselection, Qhysts and Sintrasearch so as tohave minimum ping-pong and minimum camped ontowrong cell

The black dotted lineQhyst2 CPICH_Ec/Io is the serving cells.CPICH_Ec/Io

Qhyst2Qhyst2

Qhyst2

Qhyst2

The black dotted line

UE doesn’t camp is the serving cells.

onto the best cells.Sintrasearch

UE doesn’t camp

onto the best cells.Qqualmin

Qqualmin

Treselection Treselection Treselection Treselection

Treselection Treselection Time

Treselection, Qhyst2, Sintrasearch = 0 Treselection, Qhyst2, Sintrasearch != 0





Contents

• UMTS Radio KPI overview •3G

Radio Network Optimization •






Case study from commercial projects

• Example of Accessibility KPI analysis •

Example of Call Drop KPI issue & solution •

Example of Throughput KPI issue analysis





Example of accessibility KPIs issue

Trouble-shooting of RRCsetup and RAB assignment Breakdown of CS RAB failure (Counters)

problems: VS.RAB.FailEstCS.I VS.RAB.FailEstabCS. VS.RAB.FailEstPS.• STEP1: Identify the counter with the UB.Band Other.Cell RIPFail

highest number

• STEP2: Identify the Top 10 cells withBreakdown of CS RRC failure (Counters)the same problem

VS.RRC.Rej.R VS.RRC.Rej.Cod VS.RRC.Rej.UL.C RRC.FailConnEstab.Definition of Counters

L.Fail e.Cong E.Cong NoReply VS.RAB.FailEstPs.IUB.Band : The number of

RABs unsuccessfully established in a cell dueto IUB resource congestion causes. • VS.RAB.FailEstabCS.Other.Cell : • VS.RRC.Rej.UL.CE.Cong : RRC

Pre-admission control module reports setup failure due to lack of UL CE

a resource congestion. resources





Analysis

The “worst” sites (cells) that have been found to have both IUBand CE congestion issues:

0109TO (cell id 578/579/580)

0111TO (3882/3883/3884)

0070TO (18641/18642/18643)

NodeB UL CE Occupation Rate

Name2007-02-19 2007-02-20 2007-02-21 2007-02-22

0070TO 120.83% 132.29% 132.29% 171.88%

0109TO 142.71% 175.00% 175.00% 180.21%

0111TO 158.33% 132.29% 132.29% 148.96%





Suggested solution

A comparative analysis shows that, if excluding the problematicsites, the KPI would improve substantially, say, AMR RAB assignmentsuccess rate from 97.79% to 98.09%:

KPIs (including IUB KPIs (without IUB

Congestion sites) Congestion sites)

RRC Connection Setup Success99.17%(313992/316615) 99.35%(256449/258126)

Rate (CS)(>98%)

AMR RAB Assignment Success Suggested action plan:97.79%(294499/301169) 98.09%(241127/245815)Rate(>98%)

• CE/IUB expansion

Video Call RAB Assignment98.31%(3314/3371) 98.67%(2891/2930) • Perform regular neighbour list

Success Rate(>98%)check to further tune the

PS64 RAB Assignment Success performance84.93%(2462/2899) 83.10%(1981/2384)

Rate(>97%)

PS128 RAB Assignment98.48%(16674/16932) 98.80%(13638/13803)

Success Rate(>97%)

PS384 RAB Assignment97.53%(58114/59584) 97.81%(48854/49946)

Success Rate(>97%)








Example of Throughput KPI issue analysis





Example of Call drop rate issues

Drop Call Rate Voice(3G)

Drop Call Rate Video(3G)AMR12.2 Call Drop Rate Drop Call Rate (2G)

3.5%

Voice call drop rate3.0%

2.5%changes over a three-

2.0% month optimization1.5% period1.0%

0.5%

0.0%

Zone1 Zone2Solving Voice call drop Zone3

rate problems in Top 3zones





What measures were taken tosolve the call drop problems?

Zone Action time Call drop rate Optimization measuresreduction

Zone 1 Feb. 14-17 1.57%->1.27% Scrambling code planning

adjustment

System/handover Zone 2 Feb. 23-25 1.38%->1.21% parameter tuning

Neighbour list optimization

RF optimization, etc.Zone 3 Mar.2-6 1.34%->1.10%

HUAWEI TECHNOLOGIES CO., LTD.Page 33







Example of Throughput issue analysis









The impact of missing neighbours

• 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

Low throughput

UE handover to GSM





Other causes

In addition to coverage and missing neighbour causes, the HSDPA

minimum throughput problem is due to:

• DT route crosses the IUR area where HSDPA calls are reconfigured toDCH (H2D)

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

RNC 122RNC 123 RNC 122RNC 123

RNC 121 RNC 121





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