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Introduction to UMTSRadio KPI
3G network planning introduce
www.huawei.com
Huawei Northwest Africa Region
RNP Solution Manage: William.chen
HUAWEI TECHNOLOGIES CO., LTD.
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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
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
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3G KPIs : Specific
Complete KPI definition include the formula combine with the check point
orprocedure.
The example: RRC Connection Successful Rate
n formula
RRCConnectionSuccessserviceRRCS_SR = 100%Service RRCConnect
ionAttemptservice
n Check point
The number of RRC Connection Attempt is A1
orA2?
A2 represent the effective number ofRRC
Connection Attempt.
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3G KPIs : Measurable - Drive Test
Driver test route is based onn 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 modelUEs can performdifferent tests.
Data analysis
Probe & Assistant is usedfor analyzing test data
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3G KPIs : Measurable - Stationary test
System KPI is suggested to ben Field Test ->stationary Test
test by stationary:
Evaluate the system / equipment performance. n Throughput KPI
n Delay KPI
n Quality KPICore Network
Stationary test condition is fixed,
NodeB and usually used in indoor test
scenario.
RNC
NodeB Radio Network KPI test issuggested to be test by drive test
System performance Radio Networkperformance n Call drop rate
nEquipment abilityn Handover successful raten
Radio networknTransmission planningnNetwork construct
nSpecial environmentn. condition
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3G KPIs : Measurable - Statistic test
n 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.
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Huawei KPI test platform
comprehensive analysis of the iManagerTM M2000performance, configuration,
alarm obtaining test data
GENEX Nastar 3G
sharing of
analysis results Node BRNC
v GENEX ProbeGENEX Assistant
v AGILENT 3G Node Bv QUALCOMM HLR/AC
multiple test datav HUAWEI RNC
Node 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
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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
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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 Time
Activation Context Handover RTT
Success Rate Drop Rate SuccessRate
SMS/MMS
Success Rate Inter-RAT
Handover
SuccessRate
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3G KPIs: It is not only a value
3G KPI is not only a value, but a system, for example ofCDR (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%
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3G KPIs: Attainable
3G KPI is output of combination with investment include technology,
HR, cost, competition strategy etc. Cost
Huawei KPI comply principle:
nHuawei will be responsibility for every complied KPI; le
n Cooperate with Mobilis to work out a Competitive KPI; t
n Use the experience from other commercial network;
TechnicalAttainableCommon target for Mobilis and Huawei
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3G KPIs: Time-boundnMature Network
10 90
80
Drive Test KPIs 70 6050nOngoing Optimization40 30
Stationary test KPIs 20 10Number of Sites Number of Sites Network Statistics
Network StatisticsnCommercial Launch
Benchmark testNastar
Probe & Assistant
Probe & Assistant
n Pre-LaunchProbe & AssistantKPI Acceptance
Drive Test KPIs
Stationary test KPIs
nNetwork construct Site verification
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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
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Contents
UMTS Radio KPI overview 3G
Radio Network Optimization
Case Study of KPI Optimization
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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 launchTroubleshooting
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Network Optimization Phases
Optimization
preparation RF optimization
Service test andNew site integratedparameter optimization
Routine drive test andstats. analysisSingle site verification
Acceptance criteriaN satisfied?
Y80 sites in the YN cluster ready?
Acceptance
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RF Optimization Target
n To optimize coverage n To
minimize pilot pollution n To
optimize cell dominance n To
optimize neighbor cell listn
Toresolve RF-related drop calls
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RF Parameters Optimization
n Engineering parameters adjustment
To adjust antenna down tilt
To adjust antenna azimuth
To adjust antenna location
To adjust antenna height
To replace antenna Toreplace site To add new
cell
n Radio part parameters adjustment
To optimize neighbor cell list
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Pilot Pollution Minimization
Pilot pollution definition:
Pilot pollution will result in:n SHO candidates (A)(1) low signal quality
n Active set size (B)(2) decreased system
n If A>B, pilot pollution exists capacity
(3) Call drops easier
-60
-65 Margin
-70 Ways to optimize:
(1) Antenna adjustment-75 -62-64 -66 (e.g. azimuth or down tilt)
-68 -69-80 (2) Pilot power optimization
-85 -81
-90SC1 SC2 SC3 SC4 SC5 SC6
NotActive Set Pilot Pollution
Pilot Pollution
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Pilot Pollution: Example
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RF-related Drop Calls
Problems Appearance
n Poor coverage Poor RSCP & Ec/Io
n High interference Poor Ec/Io or RTWP
n Poor UL coverage UE max Tx power
n Poor dominance many SHO events
n Pilot pollution many cells present
n Missing neighbors
Fast change of RF conditions usuallycauses drop calls, e.g. turning a corner.
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Para. Optimization Target
Para. optimizationn To reduce access failuresis an important step
after RF optimizationn To reduce drop calls
n To enhance service quality
Service quality and network resources
utilization will be improved after para.optimization
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Parameters to be Optimized
n CCCH power allocation para.
n RL maximum power para.Seldom
adjustedn Cell re-selection para.
nIntra-freq. handover para.
An effective way ton Inter-RAT handover para. reduce drop calls
n Power control para.
n Access power para. The influence caused by the
cell parameters adjustmentn Other related para. should be analyzed carefully.
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Intra-freq. Re-selection Para.
Optimize Treselection, Qhysts andSintrasearch so as tohave minimum ping-pongandminimum camped ontowrong cell
The black dotted lineQhyst2 CPICH_Ec/Io is the serving cells.CPICH_Ec/Io
Qhyst2Qhyst2
Qhyst2
Qhyst2
The black dotted line
UEdoesntcamp is the serving cells.
onto the best cells. SintrasearchUEdoesntcamp
onto the best cells.Qqualmin
Qqualmin
Treselection TreselectionTreselection Treselection
Treselection Treselection Time
Treselection, Qhyst2, Sintrasearch = 0 Treselection, Qhyst2, Sintrasearch != 0
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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-shooting of RRC
setup 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 RIPFailhighest 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 NoReplyl VS.RAB.FailEstPs.IUB.Band: The number of
RABs unsuccessfully established in a cell due
to 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
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Analysis
The worstsites (cells) that have been found to have both IUB and CEcongestion issues:
n0109TO (cell id 578/579/580)
n0111TO (3882/3883/3884)
n0070TO (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%
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Suggested solution
A comparative analysis shows that, if excluding the problematic sites,the KPI would improve substantially, say, AMR RAB assignment successrate 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%)
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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 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 Zone3rate problems in Top 3
zones
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What measures were taken to solvethe call drop problems?
Zone Action time Call drop rate Optimization measures
reduction
Zone 1 Feb. 14-17 1.57%->1.27% Scrambling code planning
adjustment
System/handoverZone 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%
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Case study from commercial projects
Example of Accessibility KPI analysis
Example of Call Drop KPI issue & solution
Example of Throughput issue analysis
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Analysis: coverage problems
RNC 123
RNC 122
Areas that lackdominant pilot
Drive test routeinvolves 3 HuaweiRNCs and 1 NortelRNC
RNC 121
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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
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Other causes
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 122RNC 123 RNC 122
RNC 123
RNC 121 RNC 121
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