005 Wcdma Utran Optimization Flow Issue1

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OWJ200101 WCDMA

UTRAN Optimization Flow

ISSUE 1.0



HUAWEI TECHNOLOGIES CO., LTD. Page 1All rights reserved

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.




Chapter 1 Introduction of Optimization FlowChapter 1 Introduction of Optimization Flow

Chapter 2 The preparation for the Optimization ProjectChapter 2 The preparation for the Optimization Project

Chapter 3 Single Site VerificationChapter 3 Single Site Verification

Chapter 4 RF OptimizationChapter 4 RF Optimization

Chapter 5 Parameters OptimizationChapter 5 Parameters Optimization

Chapter 6 Optimization ReportChapter 6 Optimization Report




WCDMA Optimization FlowWCDMA Optimization Flow




Introduction of Optimization FlowIntroduction of Optimization Flow

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:




WCDMA Optimization Flow - PreparationWCDMA Optimization Flow - Preparation




The Preparation for Projection

Understanding of the Existing Network

Cluster Division and Optimization Team

Establishment

Optimization Tools and Software

The following work is required:





Understanding of the Existing Network :

Radio Network Planning report

Latest site configuration parameter table and radiopart parameter configuration table

OMC statistic data and subscriber complaints ofthe existing network




The Preparation for the Optimization ProjectionCluster Division and Optimization Team Establishment

RNO leader-1

Data Analyzer

Drive Test Operator

Driver

RNO leader-n

Data Analyzer

Drive Test Operator

Driver

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

RNO manager





Optimization Tool:

UMTS Scanner

UMTS Test UE

GPS and data line

Digital camera

spectrum analyzer

Optimization Software:

Post processing tool

MapInfo




WCDMA Optimization Flow – Single Site VerificationWCDMA Optimization Flow – Single Site Verification




Single Site Verification

Purpose:

The single site verification test is a part of the WCDMA networkoptimization 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

Installing problems check





Single site verification includes :

preparations before test

single site test

solving problems

The single site verification is completed by:

On-site engineers

RNO engineers




Single Site Verification - Task of 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 Preparations

Application key




Verification in Idle Mode

Frequency Check

Check whether the frequency number of the cell to be measured isconsistent 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 consistentwith the planed one.

CPICH_RSCP/CPICH_Ec/Io (Near Site) Test

Check whether the CPICH RSCP and CPICH Ec/Io received by UE aregreater than the threshold





Verification in connect Mode

Originating and Terminating Connection Test of Voice Service

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

Originating and Terminating Connection Test of VP Service

Check whether the originating and terminating function of VP service

function normally by call quality test

Connection Test of PS Services

Check whether the originating function of PS services are normal byhandset online service

Solving Problems

If on-site engineers find product function problems or parameter configurationproblems, the engineers must location them and retest until the problems aresolved and process terminates.





Preparations

Cell Status Confirmation

Before checking site, you need to inquiry product support engineerswhether 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

Single Site Verification – Task of the RNO engineers




HSDPA Access Function Test

To test HSDPA access function

Antenna Diversity Check

Check whether the antenna for receiving diversity signals is reverselyconnected

Fixed Maximum Transmit Power of UE, measure the RTWP of the cells

Checking Antennas by Exchanging Feeders





Antenna Diversity Check

The method for UE to transmit signals at the fixed maximum poweris a recommended method of test and operation

Solving Problems

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






Summarization:

In single site verification stage, engineers check whether equipmentfunctions 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 verificationis completed

After single site verification, optimization comes to RF optimization




WCDMA Optimization Flow – RF OptimizationWCDMA Optimization Flow – RF Optimization




RF Optimization - Overview

Once all the sites are installed and verification is complete, RF

optimization 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




RF Optimization flow




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




RF Optimization - Targets

– ≤ 5%Pilot pollution ratio

The SHO Factor based on DT should be 5% to 10%

lower than the goal, because the following

optimizations cause the soft handover factor to increase

30% – 40%SHO Factor based on DT

≥ 95% in suburban area

According to test result from the scanner, in unloaded

and outdoor conditions, in planning coverage areas, test

in a grid-like route to cover all cells. The coverage level

request is basic. If operators have penetration loss

request, add the penetration loss to the coverage level.

≥ 98% in urban area

CPICH RSCP≥ – 95dBm

≥ 97% in suburban area

According to test result from the scanner, in unloaded

and outdoor conditions, in planning coverage areas, testin a grid-like route to cover all cells.

≥ 97% in urban area

CPICH Ec/Io≥

– 9dB

RemarksReferenceIndex






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.




RF Optimization - Preparing Tools and Data:

MapinfoGenex Nastar

Genex Assistant

Genex Probe

Software

Vehicle mounted inverter

Laptop

Test terminal and dataline

Scanner

Device

Floor plan of the target

buildings

Single site verification checklist

Survey report

Network configurationparameters

KPI requirements

Map

List of engineering parameters

Needed data




RF Optimization - Data Collection

During RF optimization stage, the key is the optimization ofradio signals distribution, with the major means of DT and indoortest

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 isbased on VP service.

During RF optimization stage, collect neighbor cell data ofnetwork optimization and other data configured in RNC database




RF Optimization - RF problem solutions

Antenna tilt

Antenna azimuth

Antenna location

Split sector

Remove sector

Combine sector

Antenna height

Antenna type

TMA

RRU

Site location

New site

h1




RF Optimization

Attention:

During the RF optimization ,sometimes the problems can be resolved

completely by proper adjustment, but there are also some disadvantages of

the RF optimization

The duration of the RF Optimization will be always very long

Some adjustment are 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

h1



Slide 34

h1 考虑删除

hw, 02/12/2006

V1




RF Optimization

Some advices:

Before the RF adjusting, we’d better survey the relative

sites, and give some applicable advice

If possible, do the RF adjustment and test the effect at

the same time

Slid 35



Slide 35

1 V78692, 19/07/2007




RF Coverage Problem Analysis

Coverage problem analysis is key to RF optimization. It

involves signal distribution. The coverage problems to beanalyzed include:

Weak coverage

Overshoot coverage

Unbalance between uplink and downlink

No primary pilot cell





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





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

Downlink coverage analysis - Pilot Coverage Strength Analysis





Downlink coverage analysis - Pilot Coverage Strength 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

Downlink coverage analysis - Pilot Coverage quality Analysis





-15.5

-104

-20

-19

-18

-17

-16

-15

-14

Ec/Io RSCP

- 1 2 0

- 1 1 5

- 1 1 0

- 1 0 5

- 1 0 0

- 9 5

- 9 0

What’s the

problem?

Downlink coverage analysis - Pilot Coverage quality Analysis:





-15.5

-63

-20

-19

-18

-17

-16

-15

-14

Ec/Io RSCP

-90

-85

-80

-75

-70

-65

-60

What’s theproblem?

Downlink coverage analysis - Pilot Coverage quality Analysis:





Downlink coverage analysis - Analyzing Primary Pilot Cell:




RF Coverage Problem AnalysisCoverage Problem Analysis


Cell primary pilot analysis is analyzing cell scrambleinformation obtained in DT

The content to be checked include :

Weak coverage cell

Cross-cell coverage cell

No primary pilot cell




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

Inconsistent Best Service Cell between scanner and UE



RF C P bl A l iC P bl A l i





Uplink - Distribution of UE Transmit Power:

The distribution of UE transmit power reflects the distribution of uplinkinterference and uplink path loss

The distribution of UE transmit power




Pilot Pollution Problem AnalysisPilot 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 are met:

The number of pilots that meet the following conditionis more than 4 and CPICH_RSCP > -100dBm

(CPICH_RSCP1st - CPICH_RSCP 4th)< 5dB





-62-63

-64

-66 -67

-81

-90

-85

-80

-75

-70

-65

-60

SC1 SC2 SC3 SC4 SC5 SC6

R S C P ( d B m )

Active Set Pilot Pollution

Margin

NotPilot Pollution

Pilot Pollution Definition - Judgment Standards :





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

Pil t P ll ti P bl A l iPil t P ll ti P bl A l i





SC C ount % in P o llu tion 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





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





Pilot pollution causes the following network problems:

Ec/Io Deterioration

Call Drop Due to Handover

Capacity Decline

Influence of Pilot Pollution :





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 ofmultiple strong pilots or lack of a strong pilot

confirm the cells that need eliminating the coverage of anarea and that need enhancing the coverage of an area

Retest after adjustment





Solutions of Pilot Pollution :

Antenna Adjustment

PCPICH Power Adjustment

Using RRU or Micro Cells




Handover Problem AnalysisHandover Problem Analysis

By adjusting RF parameters ,we can Control the size and

location of handover areas ,then we can eliminate handover

call drop due to sharp fluctuation and increase handover

success rate.

During RF optimization stage, the involved handover

problem include:

Neighbor cell optimization

Controlling SHO Factor based on DT

Handover Problem AnalysisHandover Problem Analysis Neighbor cell optimizationNeighbor cell optimization




Handover Problem AnalysisHandover Problem Analysis -- Neighbor cell optimizationNeighbor cell optimization

During RF optimization stage, missing neighbor cell is a key problem. The

neighbor cell 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

Handover Problem AnalysisHandover 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


Handover Problem AnalysisHandover Problem Analysis - Neighbor cell optimizationNeighbor 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 .






According to the DT data from scanner, you can obtain the SHO

Factor based on DT, defined as below:

Controlling SHO Factor based on DT:Controlling SHO Factor based on DT:

DTinpointscollected-scannertotalof Number

conditionshandovermeet thethatDTinpointscollected-scannerof Number＝ Ratio Handover Soft

The SHO Factor based on DT during RF optimization stage must

be 5%–10% lower than the KPI target value






UE SHO Performance

The success rates for event 1a, 1b & 1c and can be obtained

from software

Number of Active Set UpdatesNumber of Active Set Updates

Event Count

Event 1a - 328

Event 1b - 306

Event 1c - 64

Number of Active Set Update CompletesNumber of Active Set Update Completes

Event Count

Event 1a - 326

Event 1b - 305Event 1c - 62

Soft-Handover Success RateSoft-Handover Success Rate

Event Rate

Event 1a - 99.4

Event 1b - 99.7

Event 1c - 96.9




RF Analysis Approaches – Neighbor List

If the SHO Factor based on DT is over large, decrease or change

the handover areas by using the following methods for shrinking

coverage areas:

Increase the down tilt

Adjust azimuth

Decrease the antenna height

Decrease the PICH power

Controlling SHO Factor based on DT:










WCDMA Optimization Flow – Parameter OptimizationWCDMA Optimization Flow – Parameter Optimization




Purpose of Parameters Optimization

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




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




Drive Test Data Analysis

Drive Test Data Analysis

Analyzing and finding out the solution for access failure

Analyzing and finding out the solution for drop call

Analyzing and finding out the solution for service

quality related problems

Adjustment Recommendation and Implementation






Common Control Channel Power Allocation parameters

RL Maximum Power parameters

Intra-frequency Handover parameters

Inter-frequency Handover parameters

Inter-RAT Handover parameters

Power Control parameters

Access parameters

Other related parameters




Test for Special Areas

Special area refers to a small district or indoors environment

Operator offices, residence of VIP

Key hotels or entertainment location

Government location

Locations of large company or group subscribers

Locations tend to be cared , such as railway station or airport










WCDMA Optimization Flow – Optimization Report OutputWCDMA Optimization Flow – Optimization Report Output




Optimization Report

The《《《《optimization report》》》》 should be presented after theproject passes the customer acceptance. The optimizationreport should include:

Project background introduction

Existing network status

Acceptance criteria

Optimization process

Problem analysis and adjustment recommendation, and theeffect for the implemented part

Acceptance test and result

Leftover problems and suggestions from the optimization pointof view.



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005 Wcdma Utran Optimization Flow Issue1

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