introduction to genex assistant
TRANSCRIPT
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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.
3. With high efficiency
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.
3. With high efficiency
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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GENEX Assistant Functions & Features
Common features
Specific features for HSDPA
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
HSDPA KPI Displayed by Assistant
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 KPI Displayed by Assistant
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 KPI Displayed by Assistant
HSDPA HS-DSCH Decoding Statistics
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GENEX Assistant Functions & Features
Common
Specific features for HSDPA
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:
Case1. Analyzing Pilot Pollution Problem
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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
Case1. Analyzing Pilot Pollution Problem
Pilot Pollution analysis based on scanner data
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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)
Case1. Analyzing Pilot Pollution Problem
Pilot Pollution analysis based on scanner data
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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↓)
Case2. Handover Event simulation by Scanner
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.
Case2. Handover Event simulation by Scanner
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
Case3. Call Drop due to Handover Failure
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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.
Case3. Call Drop due to Handover Failure
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.
Case3. Call Drop due to Handover Failure
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
Case4. Call Drop due to 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.
Case4. Call Drop due to Weak Coverage
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
Case4. Call Drop due to Weak Coverage
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.
Case5. Call Drop due to Missing Neighbor Cell
Between 3G and 2G networks
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.
Case5. Call Drop due to Missing Neighbor Cell
Between 3G and 2G networks
Call drop at the elevator door (cont.)
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