06.April 2006
Introduction to UMTS Radio KPI 3G network planning introduce www.huawei www.huawei.com .com Huawei Northwest Africa Region RNP Solution Manage: William.chen
[email protected] 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 Specific
Measurable
Attainable Relevant Time-bound
the KPI has clear and complete definition and formula, include check point and procedure.
KPIs are measurable by given condition, measurement equipment and procedure.
all the KPIs should be reachable, it is refer to the commercial network. the KPI can show the subscriber experience 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 n formula RRCS_SRService =
RRCConnectionSuccessservice ×100% RRCConnectionAttempt service
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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3G KPIs : Measurable – Drive Test n Field Test -> Drive Test Evaluate the overall network 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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Driver test route is based on cluster, it is involved about 20 sites in one cluster usually.
3G KPIs : Measurable – Stationary test System KPI is suggested to be test by stationary:
n Field Test ->stationary Test Evaluate the system / equipment performance.
n Throughput KPI n Delay KPI n Quality KPI
Core Network
Stationary test condition is fixed, and usually used in indoor test scenario.
NodeB
RNC NodeB
System performance nEquipment ability nTransmission nNetwork construct n….
Radio Network performance nRadio network planning nSpecial environment condition
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Radio Network KPI test is suggested to be test by drive test n Call drop rate n Handover successful rate
3G KPIs : Measurable – Statistic test n Statistic Test Nastar server
Monitoring & analysis center Recommended for security
Essential Optimization team
OM system
Pre-Condition for Statistic Test Subscriber care center
Local networks
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There must be enough statistic sample, that Terminal: ordinary PC or laptop, no distance mean network traffic should be reach high limitation level.
Any corresponding dept.
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Huawei KPI test platform comprehensive analysis of the performance, configuration, alarm GENEX Nastar 3G
iManagerTM M2000
obtaining test data op para tim me iza tion ter fil au es to de matic l ive sharing of ry Node B analysis results RNC
v GENEX Probe
GENEX Assistant 3G
v AGILENT
Node B
v QUALCOMM v HUAWEI RNC
HLR/AC
multiple test data Node B
RNS
wireless test data
GENEX Probe WCDMA
R NC te d a ta s t
MSC/SSP/ VLR Node B
RNC
GMSC/SSP CN
GENEX UNet
Node B Node B
network pre-planning/planning
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RNS
PSTN PLMN ISDN
3G KPIs: Relevant Examples of User Experience (QoE) completion of a download file
End-to-end response is fast
The voice and video 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
Statistic / Measurement data HUAWEI TECHNOLOGIES CO., LTD. PDF created with pdfFactory Pro trial version www.pdffactory.com
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Availability
Huawei 3G KPIs Architecture 3G KPIs
Accessability
Retainability
• Call Setup Success Rate (Voice/VP)
• Call Drop Rate (Voice/VP)
• PDP Context Activation Success Rate
• PDP Context Drop Rate
Service Integrity
• PS Throughput
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• SHO Success Rate • Hard Handover Success Rate
• SMS/MMS Success Rate
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Mobility
• Inter-RAT Handover Success Rate
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Delay/Latency
Availability
• Call Setup Delay (Voice/VP)
• Worst Cell Rate
• PDP Context Activation Time • RTT
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
optimization
Root cause drop-call
Coverage
Hand over
59.45%
Transmission
10.02%
Pilot pollution
7.29%
Neighbor cell 2G Transport problem Interference Scramble congestionresource 4.56%
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0.68%
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0.68%
3%
2.28%
Others
11.94%
Call drop cause
3G KPIs: Attainable 3G KPI is output of combination with investment include technology, HR, cost, competition strategy etc. Cost
Huawei KPI comply principle: n Huawei will be responsibility for every complied KPI;
Reasonable n Cooperate with Mobilis to work out a Competitive KPIKPI; target n Use the experience from other commercial network; Competition
Attainable
Common target for Mobilis and Huawei
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Technical
3G KPIs: Time-bound nMature Network nOngoing Optimization
100 100 90 90 80 80 70 70 60 60 50 4050 3040 2030 1020 010 0
0 0 3 3 6 6 9 9 12 12 15 15 18 18 21 21 24 24 27 27 30 30 33 33 36 36 39 39 42 42 45 45 48 48
ü Drive Test KPIs ü Stationary test KPIs ü Network Statistics
Number of Sites Number of Sites
ü Network Statistics ü Benchmark test
nCommercial Launch Nastar
Probe & Assistant Probe & Assistant
n Pre-Launch KPI Acceptance
Ea lif c h K ed P ur I h at a s io n
Probe & Assistant
ü Drive Test KPIs ü Stationary test KPIs
nNetwork construct
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ü Site verification
Recommend 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
Test Methodology
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 Subs. Number
• RF adjustment
Drop call
• Para. adjustment
Congestion
• Maintenance and upgrade
Poor quality
• Contingency planning
Access failure ……
• Network expansion
Pr ob an lem dr a es nal y olu s tio is n
Pre-launch optimization
Single site verification
• …….
Customized and differentiated services Billing strategies
Investment RF plan review
Construction phase Troubleshooting
DT & CQT
Commercia l launch
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KPI analysis
Complaints
Booming phase Optimizing Page 16
Return
Mature phase Balancing
Time
Network Optimization Phases Optimization preparation
RF optimization
Service test and parameter optimization
New site integrated
Routine drive test and stats. analysis
Single site verification
N
80％ sites in the cluster ready?
N
Y
Acceptance criteria satisfied?
Y 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 list n To resolve 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 To replace 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: (1) low signal quality (2) decreased system capacity (3) Call drops easier
n SHO candidates (A) n Active set size (B) n If A>B, pilot pollution exists -60
RSCP (dBm)
-65
Margin
-70 -75
-62
-64
-80
-66
-68
Ways to optimize: (1) Antenna adjustment (e.g. azimuth or down tilt) (2) Pilot power optimization
-69
-85
-81
-90 SC1
SC2
Active Set
SC3
SC4
SC5
Pilot Pollution
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SC6 Not Pilot Pollution Page 20
Pilot Pollution: Example
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RF-related Drop Calls Appearance
Problems 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 usually causes drop calls, e.g. turning a corner.
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Para. Optimization Target n To reduce access failures n To reduce drop calls
Para. optimization is an important step after RF optimization
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 adjusted
n Cell re-selection para. n Intra-freq. handover para.
An effective way to reduce drop calls
n Inter-RAT handover para. n Power control para. n Access power para.
The influence caused by the cell parameters adjustment should be analyzed carefully.
n Other related para.
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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
Qhyst2
CPICH_Ec/Io
The black dotted line is the serving cells.
CPICH_Ec/Io
Qhyst2 Qhyst2 Qhyst2 Qhyst2
The black dotted line is the serving cells.
UE doesn’t camp onto the best cells.
Sintrasearch
Qqualmin
UE doesn’t camp onto the best cells.
Qqualmin Treselection
Treselection
Treselection
Treselection Treselection
Treselection, Qhyst2, Sintrasearch = 0
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Treselection
Treselection, Qhyst2, Sintrasearch != 0
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Time
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 problems: • STEP1: Identify the counter with the highest number
Breakdown of CS RAB failure (Counters) VS.RAB.FailEstCS.I UB.Band
• STEP2: Identify the Top 10 cells with the same problem
VS.RAB.FailEstabCS. Other.Cell
Breakdown of CS RRC failure (Counters) VS.RRC.Rej.R
VS.RRC.Rej.Cod
Definition of Counters L.Fail e.Cong l 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: Pre-admission control module reports a resource congestion.
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VS.RAB.FailEstPS. RIPFail
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VS.RRC.Rej.UL.C
RRC.FailConnEstab.
E.Cong
NoReply
• VS.RRC.Rej.UL.CE.Cong: RRC setup failure due to lack of UL CE resources
Analysis The “worst” sites (cells) that have been found to have both IUB and CE congestion issues: n0109TO (cell id 578/579/580) n0111TO (3882/3883/3884) n0070TO (18641/18642/18643) UL CE Occupation Rate
NodeB 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%:
RRC Connection Setup Success Rate (CS)(>98%) AMR RAB Assignment Success Rate(>98%) Video Call RAB Assignment Success Rate(>98%) PS64 RAB Assignment Success Rate(>97%) PS128 RAB Assignment Success Rate(>97%) PS384 RAB Assignment Success Rate(>97%)
KPIs (including IUB
KPIs (without IUB
Congestion sites)
Congestion sites)
99.17%(313992/316615)
99.35%(256449/258126)
97.79%(294499/301169)
98.09%(241127/245815)
Suggested action plan: • CE/IUB expansion
98.31%(3314/3371)
98.67%(2891/2930)
84.93%(2462/2899)
83.10%(1981/2384)
98.48%(16674/16932)
98.80%(13638/13803)
97.53%(58114/59584)
97.81%(48854/49946)
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• Perform regular neighbour list check to further tune the performance
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) Drop Call Rate (2G)
AMR12.2 Call Drop Rate 3.5%
Voice call drop rate changes over a threemonth optimization period
3.0% 2.5% 2.0% 1.5% 1.0% 0.5%
Zone1 Solving Voice call drop rate problems in Top 3 zones
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2006-03-19
2006-03-17
2006-03-15
2006-03-13
2006-03-11
2006-03-09
2006-03-07
2006-03-05
2006-03-03
2006-03-01
2006-02-27
2006-02-25
2006-02-23
2006-02-21
2006-02-19
2006-02-17
2006-02-15
2006-02-13
2006-02-11
2006-02-09
2006-02-07
2006-02-05
2006-02-03
2006-02-01
2006-01-30
2006-01-28
2006-01-26
2006-01-24
2006-01-22
2006-01-20
2006-01-18
2006-01-16
0.0%
Zone2 Zone3
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What measures were taken to solve the call drop problems? Zone
Action time
Call drop rate reduction
Optimization measures
Zone 1
Feb. 14-17
1.57%->1.27%
Zone 2
Feb. 23-25
1.38%->1.21%
Zone 3
Mar.2-6
1.34%->1.10%
ü Scrambling code planning adjustment ü System/handover parameter tuning ü Neighbour list optimization ü RF optimization, etc.
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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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Example of throughput KPI issues
45 Huawei sites provide coverage for DT route (Madrid South East)
Group
Service
FTP application throughput
I/B PS UL:384 DL:384
Minimum application throughput DL
HSDPA
Target
Valid calls
Successful
KPI
UL > 300 kbps DL > 361 kbps
118 (UL) 87 (DL)
118 (UL) 87 (DL)
319 (UL) 293 (DL)
> 384 Kbit/s
87
87
280
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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
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RNC 121
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06.April 2006
Thank You www.huawei.com www.huawei .com
HUAWEI TECHNOLOGIES CO., LTD.
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