06- OWJ200302 Introduction to GENEX Assistant ISSUE 1.0

8/12/2019 06- OWJ200302 Introduction to GENEX Assistant ISSUE 1.0

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www.huawei.com Huawei confidential, 2007-061

Huawei G N X Series


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Objectives

Upon completion of this course,you will be able to:

Master data analysis method of DT

Master how to use GENEX Assistant

to analyze drive test data


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GENEXAssistant 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 ofWCDMA/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 supportsdata 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:



Main Function

Import of various types of test equipment dataSupport dif ferent 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



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 mod e:

No Binning

Distance BinningGrid 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 Samplin g 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 severalseconds 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 Binn ing

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.Advantage1. 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

Disadvantagenot suitable for repeated routes, e.g. bridge.

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

5m binning

Data Binning


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Grid Binn ing

Effective supplement to distance binning, especially for repeated routes.

Advantage1. Get geographic binon repeated route.2. Avoid samples accumulation caused of long time stop, e.g. red traffic light.


Disadvantage1. lose time stamp for repeated routes

2. grid width not too big

ExampleCompare 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.

Advantage1. Used for test data analysis with stable drive speed.

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

span and maximum/minimum data sampling settings.


DisadvantageWhen the drive speed is not stable, the distribution of test data is not even.

ExampleCompare before and after effects of 1 second binning

1 second binning

lower speed

Data Binning

higher speed


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Time Binnin g (cont.)

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

1. 4 secondstime 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

Di l t t d t


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There are many operations you can do

on the map window, such as:

set layer offsetshow config neighbor cells

display the real-time serving cell

simulating the single site shutdown

test path replay forward/backward

show cell/site coverage areadisplay DT tack

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

Di l t t d t h t/ h t


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Display test data on chart

Assistant support kinds of charts such as:

time mode chart

PDF chart

CDF chart

cross double indicator chart

pie chart

Display test data on sh eet

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

C ti ti lti l i d


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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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Test data Filter (cont )


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Filter by a specific area

Test data Filter (cont.)

before

after

Show Site/Cell Coverage area

Choose a group of data on the current

map and click Lock Selected Items

after filter

Select the site the cell belongs to on the map

Right-clickShow Cell Coverage Area

Choose the cell you want to see its coverage area

Show configured neighbor cells on map


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Method:

Select the site on the map

Right-clickShow 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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Customize legend


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Parameter legend

customization

Event legendcustomization

Customize legend

Word Collector


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Word Collector

The user is allowed to open any word document

to collect the image from Assistant word collector

Simulating event by scanner data


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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

RF adjustment prediction and optimization scheme


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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 theshutdown 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

valuation

Compare the expected results and

actual measurement results plus

offset value

Analysis with RNC Data


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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.


RNC Data

Drive Test Data

Uplinkdata

Downlinkdata



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Uplink and downlink data synchronization analysis (cont.)


Two advantages with RNC data:

Restore thoroughly the information of wireless interfacesBy synchronizing the GPS time, RNC data can also be displayed on the map to locate uplink

coverage problem area


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Contents


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Common features


Case study

Contents

HSDPA Test Data Analysis


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HSDPA KPI includes:

HSDPA Throughput Statistics

HSDPA channel quality

HS-DSCH Decoding statistics

HSDPA Test Data Analysis

HSDPA KPI Displayed by Assistant


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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 layerUnit: 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 SBLERDelta 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 thro ughp ut stat ist ics & channel qual i ty



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HS-DSCH Decod ing stat ist ics

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: %

p y y

HSDPA HS-DSCH Decod ing Stat ist ics



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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 f ifth 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

p y y

HSDPA HS-DSCH Decod ing Stat ist ics

Contents


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Common


Case Study

Contents


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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:

y g



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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 toreduce coverage range on

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

SC176/SC178.

Increase antenna down tilt toreduce coverage range

along with the street, e.g. SC26.

After adjustment, pilot pollution here reduced above90%

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)


Case2. Handover Event simulation by ScannerData


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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

Data

Case2. Handover Event simulation by ScannerData


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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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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 SC238 (in Monitored Set) is much better than SC239 (in Active Set), and thisstatus 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 forhandover (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 vendorsengineers.

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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Case5. Call Drop due to Missing Neighbor CellBetween 3G and 2G networks


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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 dropoccurred.

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.



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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 sendmeasurement 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

06- OWJ200302 Introduction to GENEX Assistant ISSUE 1.0