51010199 OWJ200101 WCDMA UTRAN Optimization Flow With Comment ISSUE1 0

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Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.

WCDMA UTRANOptimization

Flow


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Page2Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.

Foreword

WCDMA optimization is a very important part in the

life of the network.

Mainly, the optimization contents the preparation,

single site verification, RF optimization, parameters

optimization.


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Contents

1. Introduction of Optimization Flow

2. The preparation for the Optimization Project

3. Single Site Verification

4. RF Optimization

5. Parameters Optimization

6. Optimization Report


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WCDMA Optimization Flow


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Introduction of OptimizationFlow

Customized Document:

Acceptance Report

Optimization Report

Site Configuration Parameter Table

Radio Part Parameter configuration Table

Process Document and Data:

Site configuration Parameter Table Radio part Parameter configuration Table

Output document:


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Contents




4. RF Optimization




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WCDMA Optimization Flow -Preparation


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The Preparation for Projection

The following work is required:

Understanding of the Existing Network

Cluster Division and Optimization Team Establishment

Optimization Tools and Software


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Understanding of the Existing Network :

Radio Network Planning report

Latest site configuration parameter table and radio

part parameter configuration table

OMC statistic data and subscriber complaints of the

existing network


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The Preparation for the OptimizationProjection

Cluster Division and Optimization TeamEstablishment

RNO leader-1

Data Analyzer

Drive Test Operator

Driver

RNO leader-n

Data Analyzer

Drive Test Operator

Driver

..................

RNO manager


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Optimization Tool:

UMTS Scanner

UMTS Test UE

GPS and data

line

Digital camera

Optimization

Software:

Post processing

tool

MapInfo


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Contents




4. RF Optimization




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WCDMA Optimization Flow Single SiteVerification


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Single Site Verification

Purpose: The single site verification test is a part of the WCDMA network

optimization to ensure that the basic functions of the cell are

normal, such as call access, call quality, handover and so on.

Single site verification involves the following aspects:

Parameter setting check in idle mode

Services call (AMR/VP/PS) function check in connected mode

HSDPA function check

CPICH RSCP & Ec/Io

Installation problems check


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Single site verification includes :

preparations before test

single site test

solving problems

The single site verification is completed by:

On-site engineers

RNO engineers


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Single Site Verification - Taskof the on-site engineers Preparations Site Status Check

For each cell to be measured, check Status by LMT or M2000 Status

Configuration Data Collection and Check

check whether the data configured is consistent with the planned data

Testing Point Selection

Test UE Setup

Set the handset to testing mode before test

Other PreparationsApplication key


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Single Site Verification - Task ofthe on-site engineers Verification in Idle Mode

Frequency Check

Check whether the frequency number of the cell to be measured is

consistent with the planned data

Scramble Check

Check whether the scramble configuration is consistent with the planned

configuration

LAC/RAC Check

Check whether the LAC/RAC of the cell to be measured is consistent with the

planed one.

CPICH_RSCP/CPICH_Ec/Io (Near Site) Test

Check whether the CPICH RSCP and CPICH Ec/Io received by UE are greater

than the threshold


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Single Site Verification - Task ofthe on-site engineers Verification in connect Mode Originating and Terminating Connection Test of Voice Service

Check whether the originating and terminating function of voice service

function normally by call quality test

Originating and Terminating Connection Test of VP Service

Check whether the originating and terminating function of VP servicefunction normally by call quality test

Connection Test of PS Services

Check whether the originating function of PS services are normal by handset

online service

Solving Problems

If on-site engineers find product function problems or parameter

configuration problems, the engineers must locate them and retest until

the problems are solved and process terminates.


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Single Site Verification Task ofthe RNO engineers Preparations

Cell Status Confirmation

Before checking site, you need to inquiry product support

engineers whether the cell is in normal status

Testing Route Selection

Before test, you must select a proper testing route according to

site distribution and local environment

Precautions


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Single Site Verification Task ofthe RNO engineers Coverage DT Check

Check whether CPICH RSCP and CPICH Ec/Io received by

scanner is normal

Abnormal power amplifier

Abnormal connection of antenna-feeder

Inconsistency of antenna tile/direction angle from planned

one

Blocking by buildings


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Single Site Verification Task ofthe RNO engineers

HSDPA Access Function Test

To test HSDPA access function

Check whether the antenna for receiving diversity

signals is reversely connected

Checking Antennas by Exchanging Feeders


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Single Site Verification Task ofthe RNO engineers Antenna Diversity Check

If the receive antenna crossed, the uplink diversity receive gain is loss, and the

uplink interfere is doubled. It will affect the uplink capability.

Solving Problems

If RNO engineers find problems about product function, RNO engineers mustask product support engineers to solve problems


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Summarization:

In single site verification stage, engineers check

whether equipment functions normally

Single site verification is a basis for the following RF

optimization and service optimization

If all verifications about function are accepted, the

single site verification is completed

After single site verification, optimization comes to RFoptimization


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Contents




4. RF Optimization




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WCDMA Optimization Flow RF Optimization


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RF Optimization - Overview

Once all the sites are installed and verification is complete, RFoptimization starts.

During the RF optimization stage, you will optimize radio frequency

(RF) signals , so that the distribution of radio signals is normal in

next service -- parameters optimization stage

RF optimization includes the following aspects:

Coverage optimization

Pilot pollution optimization

Handover optimization


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RF Optimization flow


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RF Optimization - Preparation(1)

Deciding Optimization target Weak coverage

Pilot pollution

High SHO Factor based on DT

Dividing Clusters

Deciding Test Route

Confirm the KPI DT acceptance route with the operator before DT

Preparing Tools and Data

Preparing Software

Preparing Hardware Preparing Data


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RF Optimization - Preparation(2)

Index Reference Remarks

CPICH Ec/Io 9dB 97% in urban area According to test result from the scanner, inunloaded and outdoor conditions, in planningcoverage areas, test in a grid-like route to cover allcells. 97% in suburban area

CPICH RSCP 95dBm 98% in urban area According to test result from the scanner, in

unloaded and outdoor conditions, in planningcoverage areas, test in a grid-like route to cover allcells. The coverage level request is basic. Ifoperators have penetration loss request, add thepenetration loss to the coverage level.

95% in suburban area

SHO Factor based on DT 30%40% The SHO Factor based on DT should be 5% to 10%lower than the goal, because the following

optimizations cause the soft handover factor toincrease

Pilot pollution ratio 5%

RF Optimization - Targets


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RF Optimization - Preparation(3) Dividing Clusters

RF optimization must be performed on a group of or a cluster of

NodeBs ,This ensures that interference from intra-frequency

neighbor cells are considered during optimization.

Dividing clusters involves approval by the operator.

Deciding Test Route

The KPI DT acceptance route is the core route of RF optimization

test routes. Its optimization is the core of RF optimization.


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RF Optimization - Preparing Tools andData:

Software

Genex Probe

Genex Assistant

Genex Nastar

Mapinfo

Device

Scanner

Test terminal anddata line

Laptop

Vehicle mountedinverter

Needed data

List of engineeringparameters

Map

KPI requirements

Network configurationparameters

Survey report

Single site verificationchecklist

Floor plan of the targetbuildings


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RF Optimization - DataCollection During RF optimization stage, the key is the optimization of radio

signals distribution, with the major means of DT and indoor test

DT is a major test. Collect scanner and UE data of radio signals

by DT test

Usually the DT and indoor test during RF optimization stage is

based on VP service.

During RF optimization stage, collect neighbor cell data of

network optimization and other data configured in RNC database


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RF Optimization - RF problemsolutions

Antenna tilt

Antenna azimuth

Antenna location Split sector

Remove sector

Combine sector

Antenna height

Antenna type

TMA RRU

Site location

New site


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RF Optimization

Attention:

During the RF optimization ,sometimes the problems can be resolved

completely by proper adjustment, but there is also some

disadvantages of the RF optimization

The duration of the RF Optimization will be always very long

Some adjustment is difficult to implement

If the problems are not resolved by the RF optimization, it is

difficult to recover the antennas back to the former conditions


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RF Coverage Problem Analysis

Coverage problem analysis is key to RF optimization.

It involves signal distribution. The coverage

problems to be analyzed include:

Weak coverage Overshoot coverage

Unbalance between uplink and downlink

No primary pilot cell


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Coverage Analysis Processes:

Downlink Coverage Analysis

Analyzing Pilot Coverage Strength

Analyzing Pilot Coverage quality

Analyzing Primary Pilot Cell

Analyzing comparison of UE and Scanner Coverage

Uplink Coverage Analysis

Analyzing Uplink Interference Analyzing distribution of UE Transmit Power


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Downlink coverage analysis - Pilot Coverage Strength

Analysis

Check areas of poor coverage, suggestion value as

below:

Good: RSCP -85 dBm

Fair: -95 dBm RSCP < -85 dBm

Poor: RSCP < -95 dBm

Mark the areas with weak coverage or common seamless

coverage of large areas for further analysis


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RF Coverage Problem AnalysisDownlink coverage analysis -Pilot Coverage StrengthAnalysis


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Downlink coverage analysis - Pilot Coverage quality Analysis Ec/Io plot should also be analysed based on the thresholds :

Good: Ec/Io -8 dB

Fair: -14 dB Ec/Io < -8 dB

Poor: Ec/Io < - 14 dB Areas of poor Ec/Io should be highlighted for further investigation


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-15.5

-104

-20

-19

-18

-17

-16

-15

-14

Ec/Io RSCP

- 120

- 115

- 110

- 105

- 100

- 95

- 90

Whats the

problem?

Downlink coverage analysis -Pilot Coverage qualityAnalysis:


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-15.5

-63

-20

-19

-18

-17

-16

-15

-14

Ec/Io RSCP

- 90

- 85

- 80

- 75

- 70

- 65

- 60

Whats the

problem?

Downlink coverage analysis -Pilot Coverage qualityAnalysis:


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RF Coverage Problem AnalysisDownlink coverage analysis -Analyzing Primary Pilot Cell:


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Downlink coverage analysis - Analyzing Primary Pilot

Cell:

Cell primary pilot analysis is analyzing cell scramble

information obtained in DT The content to be checked include :

Weak coverage cell

Cross-cell coverage cell

No primary pilot cell


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RF Coverage Problem AnalysisDownlink coverage analysis -Analyzing Primary Pilot Cell:


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RF Coverage Problem AnalysisDownlink coverage analysis -Analyzing comparison of UE and Scanner Coverage:

Inconsistent Best Service Cellbetween scanner and UE


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Pilot Pollution Problem Analysis

Pilot Pollution Point Definition:

The pilot pollution is that excessive strong pilots exist in

a point but no primary pilot is strong enough

Pilot pollution exists if all the following conditions aremet:

The number of pilots that meet the following condition is

more than 4 and CPICH_RSCP > -100dBm

(CPICH_RSCP1st - CPICH_RSCP 4th)< 5dB

Pilot Pollution ProblemPilot Pollution Problem


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Pilot Pollution ProblemPilot Pollution ProblemAnalysisAnalysis

-62-63

-64-66 -67

-81

-90

-85

-80

-75

-70

-65

-60

SC1 SC2 SC3 SC4 SC5 SC6

RSCP

(dB

m)

Active Set Pilot Pollution

Margin

Not

Pilot Pollution

Pilot Pollution Definition - Judgment Standards :



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Pilot Pollution ProblemPilot Pollution ProblemAnalysisAnalysisPilot Pollution Definition - Estimated Active Set Size ExampleEstimated Active Set Size Example :



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Pilot Pollution ProblemPilot Pollution ProblemAnalysisAnalysis

SC Count % in Pollution Set

8 206 12.9%

9 165 10.3%

10 157 9.8%

11 156 9.7%

12 148 9.2%

13 135 8.4%

16 95 5.9%

17 94 5.9%

18 76 4.7%19 74 4.6%

20 73 4.6%

21 56 3.5%

32 54 3.4%

35 39 2.4%

37 33 2.1%

43 19 1.2%

48 8 0.5%

53 7 0.4%

67 3 0.2%

80 2 0.1%

130 2 0.1%

Should be investigatedShould be investigated

Pilot Pollution Definition - Estimated Active Set Size Example :

Pilot pollution results


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Causes of Pilot Pollution :

Improper Cell Distribution

Over High NodeB or Highly-mounted Antenna

Improper Antenna Azimuth

Improper Antenna Down Tilt

Improper PICH Power

Ambient Factors


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Process for Analyzing Pilot Pollution Analyze scanner-based RSCP for 1st Best Service Cell and Ec/Io for

1st Best Service Cell

Analyze scanner-based Whole PP

Locate the cells that cause pilot pollution of the key areas.

Judge whether the pilot pollution is caused by existence of multiple

strong pilots or lack of a strong pilot

Confirm the cells that need eliminating the coverage of an area and

that need enhancing the coverage of an area Retest after adjustment


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Solutions of Pilot Pollution :

Antenna Adjustment

PCPICH Power Adjustment

Using RRU or Micro Cells


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Handover Problem Analysis


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Handover Problem Analysis -Neighbor cell optimization

During RF optimization stage, missing neighbor cell is a key problem. The neighborcell optimization includes adding and removing neighbor cells

Add: Missing neighbors

Remove: These neighbors that were not measured but are in the neighbor list.

Careful consideration is needed prior to removing neighbours

Neighbor cell optimization can be analyzed by :

Scanner Data

UE Data Analysis

H d P bl A l iH d P bl A l i


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Handover Problem Analysis -Handover Problem Analysis -

Neighbor cell optimizationNeighbor cell optimization By the scanner data, the Assistant can generate a

neighbor cell analysis report in the format of Excel

Hando er Problem Anal sis


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Handover Problem Analysis -Neighbor cell optimization

We can also analyze a missing neighbor cell by UE DT data

The daemon analysis tool can seldom analyze UE data automatically and generate

missing neighbor cells

but we can Compare the active set Ec/Io distribution diagram measured by UE and

that measured by scanner

The spots with missing neighbor cells has a poor Ec/Io measured by UE and a

strong Ec/Io scanned by scanner .


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Contents




4. RF Optimization





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WCDMA Optimization Flow Parameter Optimization

Purpose of Parameters


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Purpose of ParametersOptimization

Purpose of parameters optimization

Increase the access success ratio

Decrease the call drop ratio

Increase the quality of service The tools and data for analysis:

scanner and UE

RNC record data

Statistic tools and KPI

MSC & SGSN record if necessary


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Drive test The contents of drive test

The call setup test for voice service

The continuous call test for voice service

Idle mode test

The call setup test for video phone service

The continuous call test for voice service

The call setup test for PS service

The continuous call test for PS service

The test should be performed repeatedly to the position withThe test should be performed repeatedly to the position with

problems to make sure that the problem is repeatableproblems to make sure that the problem is repeatable


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Contents




4. RF Optimization





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WCDMA Optimization Flow Optimization Report Output


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Optimization Report

The

optimization report

should be presented after the projectpasses the customer acceptance. The optimization report should

include:

Project background introduction

Existing network status

Acceptance criteria

Optimization process

Problem analysis and adjustment recommendation, and the effect for the

implemented part

Acceptance test and result

Leftover problems and suggestions from the optimization point of view.


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51010199 OWJ200101 WCDMA UTRAN Optimization Flow With Comment ISSUE1 0

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