03 OWJ200302 Introduction to GENEX Assistant ISSUE1.1

www.huawei.com Huawei confidential, 2007-061

Huawei GENEX SeriesHuawei GENEX Series


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


GENEX Assistant Functions & Features

Common features

Specific features for HSDPA

Specific features for HSUPA

Case study

Contents


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.


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 different tpes of test data

Genex Probe

Huawei RNC

Agilent E6474A

Agilent E7476A

ANT

BYUE

Mobile Agent

PHU

TSMUSupport WCDMA / HSDPA / HSUPA / GSM / GPRSnetwork analysis


Main Function

Support various application analysis items

RSCP

Ec/Io

HO Event

HSDPA Throughput

Various application analysis items


To use Assistant for DT data analysis, perform the following steps1. Install Assistant2. Plus the dongle3. Create a project, set project path and map path 4. Create a dataset, choose the geographic binning mode and the data sampling

mode5. 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 tests7. 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 data10. Enable World Collector to export the required data (if necessary)11. Generate the analysis report12. Give the final report according to the analysis report and the exported data.

Workflow


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 theperiod of bus stop into the data collected severalseconds before the bus start. In the way, the datacan be clearly displayed on the map.


User need choose specific mode according to different scenario. Data binning can reduce the influence on fast fading effectively.

No BinningAnalysis 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


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

5m binning

Data Binning


Grid BinningEffective supplement to distance binning, especially for repeated routes.Advantage1. Get geographic bin on repeated route.

2. Avoid samples accumulation caused of long time stop, e.g. red traffic light. 3. With high efficiency

Disadvantage1. lose time stamp for repeated routes2. grid width not too big

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

5m*5m binning

Data Binning


Time BinningTime 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 intervals with fixed time span and maximum/minimum data sampling settings.

3. With high efficiencyDisadvantageWhen 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


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


There are many operations you can do on the map window, such as:

set layer offsetshow config neighbor cellsdisplay the real-time serving cellsimulating the single site shutdowntest path replay forward/backwardshow cell/site coverage areadisplay DT tacksearching for sitearea memoryarranging site color automaticallymap layer managementdistance measurementcopy/exporting imagefilter ( such as time filter, area filter)

Display test data on map


Display test data on chartAssistant support kinds of charts such as:

time mode chartPDF chartCDF chartcross double indicator chartpie chart

Display test data on sheetIf 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


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


Filter by a logical expressionFilter bad points or locate problem area

Filter by time

Test data Filter

before

after

Used for distinguish repeated route


Filter by a specific area

Test data Filter (cont.)

before

after

Show Site/Cell Coverage areaChoose 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-click Show Cell Coverage Area Choose the cell you want to see its coverage area


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


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 secondsaverage Ec/Io, RSCP, UE TxPower, SIR before call drop or setup failure.

Statistics as Site/Cell


Parameter legend customization

Event legend customization

Customize legend


Word Collector

The user is allowed to open any word document to collect the image from Assistant word collector


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


Site Swap/Shutdown Scheme EvaluationAssistant 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


Uplink and downlink data synchronization analysisAssistant 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

UplinkUplinkdatadata

DownlinkDownlinkdatadata


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


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 InterFreqHard-Handoff SucRate.xls

CPICH Measurements before Call End or Call Drop.xls

Analysis report



Common features



Case study

Contents


HSDPA KPI includes:

HSDPA Throughput Statistics

HSDPA channel quality

HS-DSCH Decoding statistics

HSDPA Test Data AnalysisHSDPA Test Data Analysis


average code count that UE consumes in the 200msValue range:1~15

Number of HS-DPSCH Codes

average CQI in the 200ms in HS-DSCHValue range :0~30CQI

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

instantaneous BLER(%) on the MAC layerDSCH SBLERDelta

Channel quality

instantaneous velocity of the transmission on the MAC layer (excluding the transmission failure and retransmission) (Unit: in kbps)

MAC Layer Rate(Delta)

instantaneous velocity of the transmission on the MAC layer Unit: in kbpsServed Rate(Delta)

instantaneous velocity of the scheduling on the MAC layer (Unit: in kbps)Scheduled Rate(Delta)

Throughput statistics

ExplanationNameType

HSDPA KPI Displayed by AssistantHSDPA KPI Displayed by AssistantHSDPA throughput statistics & channel quality


HS-DSCH Decoding statistics

There are three group of items: By drive test files

Statistics of All TBS

By each TBS

HSDPA KPI Displayed by AssistantHSDPA KPI Displayed by Assistant

By drive test files

Statistics of all TBS

By each TBS


BLER of the first frame; unit: %1st , SBLERBLER at the MAC layer; unit: %SBLERRatio of retransmissions of correct frames; unit: %ACKNACK/DTX

BLER at the RLC layer; unit: %Res. BLERNumber of TB transmission successes, equal to the value of SB SucBolck Suc

Number of failed TB transmissions after retransmissions, that is , the number of frames transmitted at the RLC layer after failed retransmissions at the MAC layerBlock Fail

Number 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

Dup. SB Suc

Number of TB transmission successes at the MAC layerSB SucNumber of TB transmission failures at the MAC layerSB FailNumber of frames modulated in 16QAM mode16QAMNumber of frames modulated in QPSK modeQPSKTransport block size; unit: bitTBS

ExplanationName

HSDPA KPI Displayed by AssistantHSDPA KPI Displayed by AssistantHSDPA HS-DSCH Decoding Statistics


Number of frames successfully transmitted at the second attempt after the first attempt failed2 Times

Number of frames successfully transmitted at the first attempt1 Times

Number of frames successfully transmitted at the fourth attempt after the first three attempts failed4 Times

Number of frames successfully transmitted at the third attempt after the first two attempts failed3 Times

Sum of statistics on channel decoding of each TBSAll TBS Statistics

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

Number of frames successfully transmitted at the fifth attempt after the first four attempts failedAfter four retransmissions, the RLC initiates the fifth one, which is set on the Huawei equipment

5 Times

ExplanationName

HSDPA KPI Displayed by AssistantHSDPA KPI Displayed by AssistantHSDPA HS-DSCH Decoding Statistics



Common



Case Study

Contents


HSUPA KPI includes:

HSUPA Throughput Statistics

HSUPA channel quality

HSUPA Decoding statistics

HSUPA Test Data AnalysisHSUPA Test Data Analysis


HSUPA Test Data AnalysisHSUPA Test Data AnalysisHSUPA Decoding Statistics

Combined relative grant (RG)Combined RGAverage absolute grant (AG)Average AG--Happy Rate--Buffer Limited Rate

Serving rate (SG) limited RateSG Limited Rate--Power Limited Rate

Average DPCCH PowerAverage_DPCCHAverage serving grant (SG)Average SG

Reserve BLERRes. SBLER

Average T2P E-DPCCH PowerAverage T2P E-DPCCHAverage T2P HS-DPCCH PowerAverage T2P HS-DPCCHAverage T2P DPDCH PowerAverage T2P DPDCH

--Max Power Allowed

Average T2P E-DPDCH PowerAverage T2P E-DPDCH

Ratio of the frames failing to be transmitted at the first time to the total frames1st, SBLERSub-block error RateSBLERNon-DTX RateNon-DTX Probability

Available RateMAC-e PDU Available RateServed RateMAC-e PDU Served RateScheduled RateMAC-e PDU Scheduled Rate

DescriptionName



Common



Case Study

Contents


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


Pilot Pollution analysis based on scanner dataPilot 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 Pollution

Scanner Pilot Pollution KPI:

Case1. Analyzing Pilot Pollution Problem


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

Bridge

Case1. Analyzing Pilot Pollution ProblemPilot Pollution analysis based on scanner data


4. SolutionsAntenna 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)

Case1. Analyzing Pilot Pollution ProblemPilot Pollution analysis based on scanner data


Handover Event simulation based on Scanner DataPurpose: 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 ParametersDefinitions 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



Handover Event simulation based on Scanner Data (cont.)2. Compare simulated SHO event by scanner data with the one UE reportedFor 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)



3. Observe Ec/Io change before/after call dropBefore 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. SolutionAdd SC337 to the intra-frequency neighbor cell list of SC429.


Handover Event simulation based on Scanner Data (cont.)


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

Case3. Call Drop due to Handover Failure


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

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

Case3. Call Drop due to Handover FailureMeasurement report 1A or 1C, but call drop still occurred (cont.)


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 vendors engineers.

Case3. Call Drop due to Handover FailureMeasurement report 1A or 1C, but call drop still occurred (cont.)


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



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


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


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 WCDMAnetwork. 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.



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.)


3. Solution

Add GSM cell CI 8695 to the inter-RAT neighbor cell list of WCDMA cell SC6.

4. After adjustmentAfter GSM cell is added, UE reports inter-RAT handover normally. Call drop are solved.


Call drop at the elevator door (cont.)

Documents

03 OWJ200302 Introduction to GENEX Assistant ISSUE1.1