3g overview - part11 wcdma optimization
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7/23/2019 3G Overview - Part11 WCDMA Optimization
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Part XIWCDMA Optimization
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Network Optimization Process
Objective: To optimize the outdoor part of the 3G network, this done cluster wise,
as they are being integrated.
The main elements for this process are:
1.Pre-optimisationsurvey
2.Network check
3.Initial drive test, baseline
4.Pre-Launch optimization•Cluster tuning until break-out point is reached
•Ready for network acceptance & reporting
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Pre Launch Optimization-Overview
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Pre Launch Optimization-Process
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Optimization-Overview
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Optimization-Overview Block A
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Optimization-Overview Block A
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Optimization-Overview Block B
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Optimization-Overview Block C
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Optimisation - required performance
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• Examples of performance metrics
– Area of service availability or coverage performance
– Average FER, BLER – Access failures including paging and SMS
– MOC/MOT Call Setup Failures
– Dropped call performance
– Handover percentage (Soft/Hard)
– Ec/Io&RSCP performance
• UMTS Bearer Service Attributes
– Maximum/Average bitrate (kbps) – Residual bit error ratio
– Transfer Delay
– Guaranteed bitrate (kbps)
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Key Performance Indicators, KPI
• KPIs are a set of selected indicators which are used for measuring thecurrent network performance and trends.
• KPIs highlight the key factors of network monitoring and warn in time of
potential problems. KPIs are also used to prioritise the corrective actions.
• KPIs can be defined for circuit switched and packet switched trafficseparately and be measured by field measurement systems and Nokia
NetActTM
network management system.
• An example set of KPIs
– RRC Setup Complete Ratio – RAB Setup Complete Ratio
– RAB Active Complete Ratio
– Call Setup Success Ratio
– Call Drop Rate
– Softer/Soft Handover Fail Ratio
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WCDMA RAN Optimisation
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Network Management• Nokia NetActTM for 3G
• Field Tool Server
RAN Optimisation• pre-defined procedures
• semi / full automated
configuration
Start
WindowAdd
Change1stepsize
WindrowDrop
Change1stepsize
CompThreshold
Change1stepsize
DropTimer
Change1stepsize
NMS:Collect
network
performancedata
EvaluateKPI
'HO Overhead'.
OK ?
Evaluateall
network KPIs.
OK ?
Yes
Gotorelevant
optimisation
flow-chart
No
End
Yes
No
m e a s u r e m e n t s
KPIs, counters
air-interface
Field Tool
WCDMA RAN
KPIs,measurements
Configuration
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WCDMA Field Tool
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Phase 1
Phase 2
Data Logging Tool
Post Processing Tool
Field Tool Server
• map data
• network configurationinformation
•Measurement data with
location and timestamp•Measurement data withlocation and timestamp
•File & remote IP based
interface
• connection to NMS
• Map data
• Network configurationinformation
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