introduction 3g network kpis (1)
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06.April 2006
HUAWEI TECHNOLOGIES CO., LTD.
www.huaw ei.com
Introduction to UMTSRadio KPI
HUAWEI TECHNOLOGIES CO., LTD.
www.huawei.com
Huawei Northwest Africa Region
RNP Solution Manage: William.chen
3G network planning introduce
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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
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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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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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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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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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
HUAWEI TECHNOLOGIES CO., LTD.
www.huawei.com
Thank You
www.huawei.com
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