3g overview - part11 wcdma optimization

7/23/2019 3G Overview - Part11 WCDMA Optimization

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Part XIWCDMA Optimization

244

Company Confidential



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)



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



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

3g overview - part11 wcdma optimization

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