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Transcript of Introduction 3 g-network-kp-is
06.April 2006
HUAWEI TECHNOLOGIES CO., LTD.
www.huawei.com
Introduction to UMTS Radio 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
Specificthe KPI has clear and complete definition and formula, 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 the 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 or procedure.
The example: RRC Connection Successful Rate
100%×ionAttemptRRCConnectionSuccessRRCConnect
=RRCS_SRservice
serviceService
n formula
n Check point
The number of “RRC Connection Attempt” is A1 or A2?
A2 represent the effective number of “RRC Connection Attempt”.
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n Field Test -> Drive Test
3G KPIs : Measurable – Drive Test
Evaluate the overall network performance, usually on the network pre-launch phase and initial stage of commercial launch.
Driver test route is based on cluster, it is involved about 20 sites in one cluster usually.
Test platform
Multiple test model UEs can perform different tests.
Data analysis
Probe & Assistant is used for analyzing test data
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n Field Test ->stationary TestEvaluate the system / equipment performance.
3G KPIs : Measurable – Stationary test
Core Network
RNC
NodeB
NodeB
System performance Radio Network performance
nEquipment ability
nTransmission
nNetwork construct
n….
nRadio network planning
nSpecial environment condition
System KPI is suggested to be test by stationary:
n Throughput KPI
n Delay KPI
n Quality KPI
Stationary test condition is fixed, and usually used in indoor test scenario.
Radio Network KPI test is suggested to be test by drive test
n Call drop rate
n Handover successful rate
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Monitoring & analysis center
Subscriber care center
Optimization team
Any corresponding dept.
Terminal: ordinary PC or laptop, no distance limitation
Local networks
Nastar server
Recommended for security
OM system
Essential
3G KPIs : Measurable – Statistic test
n Statistic Test
There must be enough statistic sample, that mean network traffic should be reach high level.
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 dataparameter
optimization files
v GENEX Probe
v AGILENT
v QUALCOMMv HUAWEI RNC
comprehensive analysis of the performance, configuration, alarm
GENEX U-Net
automatic delivery
RNC testdata
sharing of
analysis results
Huawei KPI test platform
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Statistic / Measurement data
Examples of User Experience (QoE)
completion of a download 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 response is fast
The voice and video is Clare
Service Performance
Radio Network KPI
3G KPIs: Relevant
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3G KPIs
Accessability Retainability Service Integrity Mobility Delay/Latency
• Call Setup Success Rate (Voice/VP)
• PDP Context Activation Success Rate
• SMS/MMS Success Rate
• Call Drop Rate (Voice/VP)
• PDP Context Drop Rate
• PS Throughput • SHO Success Rate
• Hard Handover Success Rate
• Inter-RAT Handover Success Rate
• Call Setup Delay (Voice/VP)
• PDP Context Activation Time
• RTT
• Worst Cell Rate
Availability
Huawei 3G KPIs Architecture
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3G KPI is not only a value, but a system, for example of CDR (Call Drop Rate)
3G KPIs: It is not only a value
Network Planning Network Construct Transmission optimization
Coverage
Pilot pollution
Neighbor cell problem
Hand over Transport
congestionInterference Scramble2G
resource Call drop cause
Others
59.45% 7.29% 4.56% 0.68% 0.68% 3% 2.28% 11.94%10.02%
Root cause drop-call
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Reasonable KPI target
Cost
CompetitionCompetition
Technical Technical
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;
AttainableAttainable Common target for Mobilis and Huawei
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HUAWEI TECHNOLOGIES CO., LTD. Page 130 3 6 9
12 15 18 21 24 27
30 33 36 39 42
45 48
010
2030
4050
60
70
80
90
100
Number of Sites
0 3 6 9
12 15 18 21 24 27
30 33 36 39 42
45 48
010
2030
4050
60
70
80
90
100
Number of Sites
nOngoing Optimization
nCommercial Launch
n Pre-LaunchKPI Acceptance
nMature Network
Nastar
Probe & Assistant
ü Drive Test KPIsü Stationary test KPIsü Network Statistics
Probe & Assistant
ü Drive Test KPIsü Stationary test KPIs
nNetwork constructü Site verification
3G KPIs: Time-bound
ü Network Statisticsü Benchmark test
Probe & Assistant
Each KPI has
life duration
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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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Construction phase
Troubleshooting
Booming phaseOptimizing
Mature phaseBalancing
Time
Subs. Num
ber
RF plan review
Single site verification
Pre-launch optimization
KPI analysis
ComplaintsDT & CQT
Prob
lem
ana
lysi
s
and
reso
lutio
n
Customized and differentiated
services
Billing strategies
Drop call
Congestion
Poor quality
Access failure
……
•RF adjustment
•Para. adjustment
•Maintenance and upgrade
•Contingency planning
•Network expansion
•…….
Investment Return
Commercial 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 and parameter optimization
Routine drive test and stats. analysis
Acceptance criteriasatisfied?
New site integrated
Optimizationpreparation
Acceptance
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RF Optimization TargetRF Optimization Target
n To optimize coverage
n To minimize pilot pollution
n To optimize cell dominance
n To optimize neighbor cell list
n To resolve RF-related drop calls
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RF Parameters Optimization
n Engineering parameters adjustmentTo 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
n Radio part parameters adjustment
To optimize neighbor cell list
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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
RSC
P (d
Bm)
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 change of RF conditions usually causes drop calls, e.g. turning a corner.
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. optimization is an important step after RF optimization
Service quality and network resources utilization will be improved after para. optimization
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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.
n Intra-freq. handover para.
n Inter-RAT handover para.
n Power control para.
n Access power para.
n Other related para.
The influence caused by the cell parameters adjustment should be analyzed carefully.
Seldom adjusted
An effective way to reduce drop calls
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Intra-freq. Re-selection Para.
Treselection, Qhyst2, Sintrasearch = 0
Optimize Treselection, Qhysts and Sintrasearch so as to have minimum ping-pong and minimum camped onto wrong cell
Qhyst2
Qhyst2
Qhyst2
Treselection TreselectionTreselection Treselection
Qqualmin
CPICH_Ec/Io
The black dotted line is the serving cells.UE doesn’t camp
onto the best cells.
Treselection, Qhyst2, Sintrasearch != 0
Qqualmin
Sintrasearch
CPICH_Ec/Io
Time
The black dotted line is the serving cells.
Qhyst2
Qhyst2
UE doesn’t camp onto the best cells.
Treselection Treselection
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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 assignmentproblems: • STEP1: Identify the counter with the highest number
• STEP2: Identify the Top 10 cells with the same problem
VS.RAB.FailEstPS.RIPFail
VS.RAB.FailEstabCS.Other.Cell
VS.RAB.FailEstCS.IUB.Band
Breakdown of CS RAB failure (Counters)
Definition of Counters l VS.RAB.FailEstPs.IUB.Band: The number of RABs unsuccessfully established in a cell due to IUB resource congestion causes.
RRC.FailConnEstab.NoReply
VS.RRC.Rej.UL.CE.Cong
VS.RRC.Rej.Code.Cong
VS.RRC.Rej.RL.Fail
Breakdown of CS RRC failure (Counters)
• VS.RAB.FailEstabCS.Other.Cell: Pre-admission control module reports a resource congestion.
• VS.RRC.Rej.UL.CE.Cong: RRC setup failure due to lack of UL CE resources
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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 RateNodeB Name
n0109TO (cell id 578/579/580) n0111TO (3882/3883/3884)n0070TO (18641/18642/18643)
The “worst” sites (cells) that have been found to have both IUB and CE congestion issues:
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 Success Rate(>98%)
RRC Connection Setup Success Rate (CS)(>98%)
A comparative analysis shows that, if excluding the problematic sites, the KPI would improve substantially, say, AMR RAB assignment success rate from 97.79% to 98.09%:
Suggested action plan:• CE/IUB expansion
• Perform regular neighbour list check to further tune the performance
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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%
2006
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06-0
1-30
2006
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2006
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06-0
2-05
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0720
06-0
2-09
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2-23
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Drop Call Rate Voice(3G)Drop Call Rate Video(3G)Drop Call Rate (2G)
Example of Call drop rate issues
Voice call drop rate changes 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 solve the call drop problems?
1.34%->1.10%Mar.2-6Zone 3
1.38%->1.21%Feb. 23-25Zone 2
ü Scrambling code planning adjustmentü System/handover parameter tuningü Neighbour list optimizationü RF optimization, etc.
1.57%->1.27%Feb. 14-17Zone 1
Optimization measures Call drop rate reduction
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 sites provide coverage for DT route (Madrid South East)
Example of throughput KPI issues
2808787> 384 Kbit/sHSDPAMinimum application throughput DL
319 (UL)293 (DL)
118 (UL)87 (DL)
118 (UL)87 (DL)
UL > 300 kbpsDL > 361 kbps
I/B PS UL:384DL:384
FTP application throughput
KPI Successful Valid callsTargetService Group
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RNC 123
RNC 122
RNC 121
Areas that lack dominant pilot
Analysis: coverage problems
Drive test route involves 3 Huawei RNCs and 1 Nortel RNC
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• DL R99 throughput has been impacted by the interference generated by missing neighbors, 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 HSDPA minimum 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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