introduction to 3g kpis
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Introduction to UMTS Radio KPI
3G network planning introduce www.huawei.com
Huawei Northwest Africa Region
RNP Solution Manage:
William.chen
[email protected] HUAWEI TECHNOLOGIES CO., LTD.
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Agenda
UMTS Radio KPI overview
3G Network Optimization
Case Study of KPI Optimization
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3G KPIs Principle: S.M.A.R.T
the KPI has clear and complete definition and Specific 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 or procedure.
The example: RRC Connection Successful Rate
formula RRCConnect ionSuccess
service RRCS_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”.
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3G KPIs : Measurable - Drive Test
Driver test route is based on Field Test -> Drive Test cluster, 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 used for analyzing test data
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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 Network
Stationary 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 test System performance Radio Network
performance Call drop rate Equipment ability
Handover successful rate Radio network Transmission planning
Network construct Special environment …. condition
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3G KPIs : Measurable - Statistic test
Statistic Test
Nastar server
Monitoring & analysis center
Recommended for security Essential Optimization team
OM system
Pre-Condition for Statistic Test Subscriber care center
There must be enough statistic sample, that Terminal: ordinary PC or laptop, no distance mean network traffic should be reach high limitation
level. Local networks Any corresponding dept.
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Huawei KPI test platform
comprehensive analysis of the iManagerTM M2000 performance, 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/AC multiple test data
HUAWEI RNC Node B
RNS
PSTN GENEX Probe MSC/SSP/ PLMN
WCDMA wireless test data ISDN VLR Node B
RNC GMSC/SSP
CN GENEX U- Node B
Net Node B RNS
network pre-planning/planning
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3G KPIs: Relevant Examples 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 KPI AMR12.2, 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 Cell Success 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 Success
Rate • SMS/MMS Success Rate • Inter-RAT
Handover Success Rate
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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
cause 59.45% 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:
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
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3G KPIs: Time-bound Mature Network
10 90
80 Drive Test KPIs 70 60
50 Ongoing Optimization 40 30 Stationary test KPIs 20 10
Number of Sites Number of Sites Network Statistics
Network Statistics Commercial Launch Benchmark test Nastar
Probe & Assistant Probe & Assistant
Pre-Launch Probe & Assistant KPI Acceptance
Drive Test KPIs Stationary test KPIs
Network 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 adjustment Drop call
•Para. adjustment Congestion
•Maintenance and upgrade Poor quality
•Contingency planning Access failure
•Network expansion Pre-launch optimization ……
•…….
Customized and differentiated services
Single site verification Billing strategies
Return Investment
RF plan review DT & CQT KPI Complaints analysis
Construction Booming phase Mature phase Time Commercia phase
Optimizing Balancing l launch Troubleshooting
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Network Optimization Phases
Optimization
preparation RF optimization
Service test and New site integrated parameter optimization
Routine drive test and stats. analysis
Single site verification
Acceptance criteria N satisfied?
Y 80 % sites in the Y
N cluster ready?
Acceptance
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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
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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
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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
-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
-90 SC1 SC2 SC3 SC4 SC5 SC6
Not Active Set Pilot Pollution Pilot Pollution
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Pilot Pollution: Example
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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 usually causes drop calls, e.g. turning a corner.
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Para. Optimization Target
Para. optimization To reduce access failures is an important step
after RF optimization To reduce drop calls
To enhance service quality
Service quality and network resources utilization will be improved after para. optimization
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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.
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Intra-freq. Re-selection Para.
Optimize Treselection, Qhysts and Sintrasearch so as to have minimum ping-pong and minimum camped onto wrong cell
The black dotted line Qhyst2 CPICH_Ec/Io is the serving cells. CPICH_Ec/Io
Qhyst2 Qhyst2
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
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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 RIPFail highest number
• STEP2: Identify the Top 10 cells with Breakdown 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 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 “worst” sites (cells) that have been found to have both IUB and CE congestion issues:
0109TO (cell id 578/579/580) 0111TO (3882/3883/3884) 0070TO (18641/18642/18643)
NodeB UL CE Occupation Rate Name
2007-02-19 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 success rate from 97.79% to 98.09%:
KPIs (including IUB KPIs (without IUB
Congestion sites) Congestion sites)
RRC Connection Setup Success 99.17%(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 Assignment 98.31%(3314/3371) 98.67%(2891/2930) • Perform regular neighbour list
Success Rate(>98%) check to further tune the
PS64 RAB Assignment Success performance 84.93%(2462/2899) 83.10%(1981/2384)
Rate(>97%)
PS128 RAB Assignment 98.48%(16674/16932) 98.80%(13638/13803)
Success Rate(>97%)
PS384 RAB Assignment 97.53%(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 rate 3.0%
2.5% changes over a three-
2.0% month optimization 1.5% period 1.0%
0.5%
0.0%
Zone1 Zone2 Solving Voice call drop Zone3
rate problems in Top 3 zones
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What measures were taken to solve the 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/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%
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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 lack dominant pilot
Drive test route involves 3 Huawei RNCs and 1 Nortel RNC
RNC 121
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The impact of missing neighbours
• 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
Low throughput
UE handover to GSM
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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 to DCH (H2D)
• UE moves from a non-hotspot to a hotspot site in HSDPA connected mode
RNC 122 RNC 123 RNC 122
RNC 123
RNC 121 RNC 121
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