Introduction to GENEX Assistant

www.huawei.com Huawei confidential, 2007-06

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Huawei GENEX Series


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Objectives

Upon completion of this course,

you will be able to:

• Learn data analysis method of DT

• Learn how to use GENEX Assistant

to analyze drive test data


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GENEX Assistant Functions & Features

Common features

Specific features for HSDPA

Case study

Contents


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Introduction

As a radio network test data post processing software,

GENEX Assistant is used to analyze air interface test data of

WCDMA/GSM radio network.

Assistant can support UE test data and RNC data, and

provide integrated analysis of uplink and downlink data.

Assistant provides powerful auto-report function, and supports

data display on various display modes such as maps, charts

and tables to greatly improve the working efficiency of

engineers.


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Main Function

▪ WCDMA/GSM dual-mode test.

▪ Import of various types of test equipment data

▪ Various application analysis items

▪ Combined analysis of uplink and downlink data

▪ Layer-3 signaling decoding

▪ Auto analysis report

▪ Replay of test data

▪ Multiple data display modes

▪ Four types of data binning modes and

▪ Three data sampling types

▪ Multi-window co-activation.

▪ Data filtering by specific parameters

▪ Data export in various display modes

▪ Flexible extension of drive test data type

▪ Word gather function

▪ Combination of multi-UE, and multi-scanner

data

Assistant has the powerful functions, and it can support:


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Main Function

Import of various types of test equipment dataSupport different tpes of test data

Genex Probe

Huawei RNC

Agilent E6474A

Agilent E7476A

ANT

BYUE

Mobile Agent

PHU

TSMU

Support WCDMA / HSDPA / HSUPA / GSM / GPRS

network analysis


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Main Function

Support various application analysis items

▪ RSCP

▪ Ec/Io

▪ HO Event

▪ HSDPA Throughput

▪ ……

Various application analysis items


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To use Assistant for DT data analysis, perform the following steps：

1. Install Assistant

2. Plus the dongle

3. Create a project, set project path and map path

4. Create a dataset, choose the geographic binning mode and the data sampling

mode

5. Import test data

6. If there are several log files generated during test, you can choose to combine

the devices, so that it will be easy to give a general analysis of all the tests

7. Import configuration parameter (e.g. Engineering parameter, neighbor cell

parameter)

8. Import RNC data (if necessary)

9. Display data on map/chart/sheet and analyze data

10. Enable World Collector to export the required data (if necessary)

11. Generate the analysis report

12. Give the final report according to the analysis report and the exported data.

Workflow


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Dataset Settings

4 geographic binning mode:• No Binning

• Distance Binning

• Grid Binning: Sets the parameters of the measurement

point in the grid as the one of the grid center.

• Time Binning: Averages all the test data collected in a

time bucket.

3 Data Sampling mode:• Average: Average value of the data of all the points after

the geographic binning.

• Maximum: Maximum value of the data of all the points

after the geographic binning.

• Minimum: Minimum value of the data of all the points

after the geographic binning.

Data Disperse:The dispersing of the drive test data collected in the

period of bus stop into the data collected several

seconds before the bus start. In the way, the data

can be clearly displayed on the map.


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User need choose specific mode according to different scenario. Data binning can

reduce the influence on fast fading effectively.

No Binning

Analysis based on original test data. Usually used for events and message

synchronous analysis.

Advantage: Locate at each event and message, for detail trouble shooting.

Disadvantage: 1. Large data amount;

2. Geographic distribution of original test data maybe not even.

Data Binning


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Distance Binning

Most common used in drive test. Used for post-processing for CW measurements and statistic

analysis for coverage area.

Advantage：1. Get even geographic bin on single direction route.

2. Avoid samples accumulation caused of long time stop, e.g. red traffic light.

3. With high efficiency

Disadvantage：not suitable for repeated routes, e.g. bridge.

Example： Compare before and after effects of 5m binning (Required: drive test speed is not too fast)

5m binning

Data Binning


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Grid Binning

Effective supplement to distance binning, especially for repeated routes.

Advantage：1. Get geographic bin on repeated route.

2. Avoid samples accumulation caused of long time stop, e.g. red traffic light.


Disadvantage ：1. lose time stamp for repeated routes

2. grid width not too big

Example： Compare before and after effects of 5m*5m binning

5m*5m binning

Data Binning


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Time Binning

Time binning requires the drive car with stable speed. It is also used for some specific KPIs analysis

within continuous time intervals.

Advantage：1. Used for test data analysis with stable drive speed.

2. Used for some specific KPIs analysis within continuous time intervals with fixed time

span and maximum/minimum data sampling settings.


Disadvantage：When the drive speed is not stable, the distribution of test data is not even.

Example： Compare before and after effects of 1 second binning

1 second binning

lower speed

Data Binning

higher speed


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Time Binning (cont.)

For example, we want to know BLER in some continuous intervals, so we set:

1. 4 seconds time binning;

2. Minimum data sampling.

The figure below indicates the minimum BLER within four seconds is greater than 5%, so, the data

transmission maybe has some problems.

BLER within 4 seconds is

greater than 5%

Data Binning


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There are many operations you can do

on the map window, such as:

•set layer offset

•show config neighbor cells

•display the real-time serving cell

•simulating the single site shutdown

•test path replay forward/backward

•show cell/site coverage area

•display DT track

•searching for site

•area memory

•arranging site color automatically

•map layer management

•distance measurement

•copy/exporting image

•filter ( such as time filter, area filter)

Display test data on map


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Display test data on chart

Assistant support kinds of charts such as:

•time mode chart

•PDF chart

•cross double indicator chart

•pie chart

Display test data on sheet

If display test data on sheet, we can do operations such as:

searching for a specific cell in the sheet; find out the maximum,

minimum value in sheet; calculate the average value, standard

deviation of the selected data in the sheet, etc.

Display test data on chart/sheet


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This function shows the relationship in time between the windows and helps to

check the message and the events in a quick way.

Coactivating multiple windows


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Filter by time

Test data Filter

Used for distinguish repeated route

before

after

Choose a group of data on the current

map and click “Lock Selected Items”

Filter by a specific area


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Test data Filter (cont.)

Show Site/Cell Coverage area

after filter

• Select the site the cell belongs to on the map

• Right-click Show Cell Coverage Area

• Choose the cell you want to see it’s coverage area


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Method:

• Select the site on the map

• Right-click Show Config Neighbor

Cell

• Select the service cell on the left of

the dialog box

• The neighbor cells will be displayed

on the right of the dialog box. If one

neighbor cell is selected, there will

be only one neighbor cell displayed

on map. We can select multi-

neighbor cell using SHIFT+click.

Show configured neighbor cells on map


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• Statistic cell coverage, call

dropped, call setup failure and

soft handover site by site

• On call drop and call setup

failure, we can acquire the

information of 5 seconds’

average Ec/Io, RSCP, UE Tx

Power, SIR before call drop or

setup failure.

Statistics as Site/Cell


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Parameter legend

customization

Event legend

customization

Customize legend


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Word Collector

The user is allowed to open any word document

to collect the image from Assistant word collector


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Simulated events include:

• Soft Handover

• Pilot Pollution

Used for:

• Neighbor cells Optimization

• Pilot Pollution Analysis

• Call drop Analysis

Assistant also supports CIO setting to ensure the

simulation closes to real network.

Detail information refers to “Case1. Analyzing Pilot

Pollution Problem” and “Case2. Handover Event

simulation by Scanner Data”.

Simulating event by scanner data


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Site Swap/Shutdown Scheme Evaluation

Assistant refers to the planning prediction method used in optimization analysis. It provides site/cell

shutdown simulation.

The single site shutdown simulation simulates the pilot signal change on the drive test points that the

shutdown site covers during the drive test and makes a further judgment on the influence of the

shutdown site on its covered drive test points.

The main task in the single site shutdown simulation is to recalculate the RSSI of the drive test point.

For example: Cell SC45 shutdown simulation

RF adjustment prediction and optimization scheme

valuation

Compare the expected results and

actual measurement results plus

offset value


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Uplink and downlink data synchronization analysis

Assistant supports huawei RNC data which can collect the whole messages through UE-

>NodeB->CN.

By synchronizing the GPS time, Assistant can display the drive test data and the RNC data

simultaneously. This enables integrated analysis of uplink and downlink data that includes

RNC subscriber tracing signaling.

Analysis with RNC Data

RNC Data

Drive Test Data

Uplinkdata

Downlinkdata


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Uplink and downlink data synchronization analysis (cont.)

Analysis with RNC Data

Two advantages with RNC data:

• Restore thoroughly the information of wireless interfaces

• By synchronizing the GPS time, RNC data can also be displayed on the map to locate uplink

coverage problem area


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Assistant provides more 20 reports, such as drive test report, scanner neighbor cell analysis, UE

CPICH Measurements Analysis before/after Call End or Call Drop, UE SHO performance analysis,

etc.Drive test Report.doc

WCDMA ScannerNeighborCell.xls

WCDMA UE InterFreq

Hard-Handoff SucRate.xls

CPICH Measurements before Call End or Call Drop.xls

Analysis report


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Common features


Case study

Contents


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HSDPA KPI includes:

• HSDPA Throughput Statistics

• HSDPA channel quality

• HS-DSCH Decoding statistics

HSDPA Test Data Analysis


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Type Name Explanation

Throughput

statistics

Scheduled Rate(Delta)instantaneous velocity of the scheduling on the MAC

layer (Unit: in kbps)

Served Rate(Delta)instantaneous velocity of the transmission on the MAC

layer （Unit: in kbps）

MAC Layer Rate(Delta)instantaneous velocity of the transmission on the MAC

layer (excluding the transmission failure and

retransmission) (Unit: in kbps)

Channel

quality

DSCH SBLER（Delta） instantaneous BLER(%) on the MAC layer

HS-SCCH Success

Rate(Delta)instantaneous usage(%) of the HS-SCCH channel

CQIaverage CQI in the 200ms in HS-DSCH

Value range :0~30

Number of HS-DPSCH

Codes

average code count that UE consumes in the 200ms

Value range:1~15

HSDPA KPI Displayed by Assistant

HSDPA throughput statistics & channel quality


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HS-DSCH Decoding statistics

There are three group of items:

• By drive test files

• Statistics of All TBS

• By each TBS


By drive test files

Statistics of all TBS

By each TBS


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Name Explanation

TBS Transport block size; unit: bit

QPSK Number of frames modulated in QPSK mode

16QAM Number of frames modulated in 16QAM mode

SB Fail Number of TB transmission failures at the MAC layer

SB Suc Number of TB transmission successes at the MAC layer

Dup. SB SucNumber of retransmissions of the same TB, that is , the number of NACK messages to which the NodeB translates

from the ACK messages provided by the UE upon successful decoding

ACKNACK/DTX Ratio of retransmissions of correct frames; unit: %

SBLER BLER at the MAC layer; unit: %

1st , SBLER BLER of the first frame; unit: %

Block FailNumber of failed TB transmissions after retransmissions, that is , the number of frames transmitted at the RLC layer

after failed retransmissions at the MAC layer

Bolck Suc Number of TB transmission successes, equal to the value of SB Suc

Res. BLER BLER at the RLC layer; unit: %


HSDPA HS-DSCH Decoding Statistics


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Name Explanation

All TBS Statistics Sum of statistics on channel decoding of each TBS

1 Times Number of frames successfully transmitted at the first attempt

2 Times Number of frames successfully transmitted at the second attempt after the first attempt failed

3 Times Number of frames successfully transmitted at the third attempt after the first two attempts failed

4 Times Number of frames successfully transmitted at the fourth attempt after the first three attempts failed

5 TimesNumber of frames successfully transmitted at the fifth attempt after the first four attempts failed

After four retransmissions, the RLC initiates the fifth one, which is set on the Huawei equipment

>= 6 Times Number of frames successfully transmitted at the sixth or later attempt after all the previous attempts failed


HSDPA HS-DSCH Decoding Statistics


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Common


Case Study

Contents


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Contents

Case1. Analyzing Pilot Pollution Problem

Case2. Handover Event simulation by Scanner Data

Case3. Call Drop due to Handover Failure

Case4. Call Drop due to Weak Coverage

Case5. Call Drop due to Missing Neighbor Cell Between

3G and 2G networks


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Pilot Pollution analysis based on scanner data

Pilot pollution causes the following network problems.

• Ec/Io Deterioration: Multiple strong pilots interferes useful functional signals, so Io increases, Ec/Io

decreases, BLER increases, and network quality declines.

• Call Drop Due to Handover: More than three strong pilots or no primary pilot exists in multiple pilots,

frequent handover occurs among these pilots. This might cause call drop.

• Capacity Decline: The interference of the areas with pilot pollution increases, the system capacity

declines.

Using Assistant to analyze Pilot Pollution:

1. Customize Pilot PollutionScanner Pilot Pollution KPI:



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2. Locate Pilot Pollution area

Pilot Pollution happens near the bridge. Multiple strong pilots include:

• signals on the thither side of the bridge

• signals along with the street

Pilot Pollutions Area




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4. Solutions

Antenna down tilt adjustment

• Reduce antenna down tilt to increase cell coverage

range on the thither side of the bridge. e.g. SC224.

• Increase antenna down tilt to reduce coverage range on

the thither side of the bridge. e.g. SC170 and

SC176/SC178.

• Increase antenna down tilt to reduce coverage range

along with the street, e.g. SC26.

After adjustment, pilot pollution here reduced above 90%

3. Confirm the cells causing Pilot Pollution

• SC224 (available signals on the thither side of the bridge)

• SC50, SC176/SC178, SC170 (overshooting on the thither side of the bridge)

• SC26 (overshooting along with the street)

• SC1 (available signals)




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Handover Event simulation based on Scanner Data

Purpose: During the test, call drop due to SHO might occur. If it is caused by missing neighbor cell,

by comparing simulated SHO event based on scanner data with the one UE reported, we can detect

the problems more easily.

1. Customize Scanner Simulate SHO Parameters

Definitions are same with UE SHO, including Threshold, Hysteresis, Time to Trigger and Active Set

Size.* CIO (Cell Independent Offset) setting,

make simulation more practical.

Simulated SHO event

Case2. Handover Event simulation by Scanner

Data


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Handover Event simulation based on Scanner Data (cont.)

2. Compare simulated SHO event by scanner data with the one UE reported

For example, the feature below indicates a call drop occurred. From UE, the Best Ec/Io in active set

became worse (red color). But from scanner, the Best Server Ec/Io is pretty good.

Before call drop, scanner simulated 1A, 1C events.

Scanner

UE (offset↓)


Data


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3. Observe Ec/Io change before/after call drop

Before call drop, scramble with best Ec/Io in active set recorded by UE is 429. After call drop, it became

337.

Meanwhile, best server scramble recorded by scanner before call drop is 337.

This call drop is due to missing neighbor cell.

Scanner

UE (offset↓)

4. Solution

Add SC337 to the intra-frequency neighbor cell

list of SC429.


DataHandover Event simulation based on Scanner Data (cont.)


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1. Pay attention to the call drop on the map

Ec/Io of SC329 in Active Set is very poor (maybe due to antenna azimuth), and Ec/Io of SC328 in

Monitored Set is much better. Usually, there should be a SHO.

Measurement report 1A or 1C, but call drop still occurred



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2. Compare the best Ec/Io in Active Set with Monitored Set

Before call drop, Ec/Io of SC328 (in Monitored Set) is much better than SC329 (in Active Set), and this

status keeps for long time, and match the thresholds of SHO.

So we need more information with the help of message browser.


Measurement report 1A or 1C, but call drop still occurred (cont.)


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3. Check messages before call drop

In message browser, we will find that UE has sent “Measurement Report” many times and asked for

handover (to SC328 and so on).

But there was no response replied from network side.

So the call drop happened.

4. Troubleshooting

It is possible that there are some mistakes

of parameters configuration of network

side. User should contact with vendor’s

engineers.


Measurement report 1A or 1C, but call drop still occurred (cont.)


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The characteristic of weak coverage is: weak RSCP and Ec/Io,

TxPower increases, even reaches the maximum before call drop

1. Check the Ec/Io and RSCP around this call drop point

We will find that receive signals in red box are very weak, especially

before the call drop.

So we need to observe Ec/Io and RSCP on chart in more detail.

Weak coverage



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2. Observe RSCP and Ec/Io before call

drop

On the charts, we will find that Ec/Io and

RSCP in Active Set and Monitor Set

became worse and worse.

UE has send “Measurement Report” many

times, but there was no right cell to

provide enough coverage.

Finally, call drop occurred.


Weak coverage


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3. Analysis

The distance from call drop point to SC212 (nearest working cell in Active Set) is 2078m, and the

azimuth of SC212 is reverse to call drop area. There is a much nearer cell SC190, but it seems not to

work.

4. Solution

• Check the site in red box, and turn it on

• Adjust RF parameters of cells nearby


Weak coverage


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Call drop at the elevator door

WCDMA (signal deteriorate) call drop GSM (after cell re-

selection)

1. Description

Outside the elevator, the serving cell

is SC6 in areas covered by WCDMA

network. Inside the elevator, it

covered by a GSM cell (CI 8695).

After close the door, the signal

attenuates sharply, call drop

occurred.

Normally, there should be an inter-

RAT handover. But in this case, after

call drop, UE needs re-select to

GSM network.

The cause might be missing

neighbor cell or delayed handover.

Case5. Call Drop due to Missing Neighbor Cell

Between 3G and 2G networks


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2. Analysis

Before call drop, UE reports 1F measurement report, but no 2D. That is when UE moves

to a GSM cell, it fails to start compression mode to start inter-RAT measurement.

Cause:

Indoor GSM cell CI 8695 is not

configured as the neighbor cell of

SC6. RNC does not send

measurement control report.



Call drop at the elevator door (cont.)


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3. Solution

Add GSM cell CI 8695 to the inter-RAT neighbor cell list

of WCDMA cell SC6.

4. After adjustment

After GSM cell be added, UE reports

inter-RAT handover normally. Call

drop are solved.



Call drop at the elevator door (cont.)


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Documents

Introduction to GENEX Assistant