introduction to wl mos solution
TRANSCRIPT
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WIRELESS LOGIX, INC. PROPRIETARY AND CONFIDENTIAL PagePage 11WIRELESS LOGIX, INC. PROPRIETARY AND CONFIDENTIAL
2005.3rd Quarter
Introduction ofIntroduction ofWLWL’’s MOS Solutions MOS Solution
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MOS algorithms in ITUMOS algorithms in ITU--TT
•MOS : Mean Opinion Score
•Technologies for Voice Quality Testing in Test Solution- 1996 : ITU-T Rec P.800
PAMS (Perceptual Analysis Measurement System)- 1996 : ITU-T Rec P.861
PSQM (Perceptual Speech Quality Measurement)- 2000 : ETSI Technical Report (ETR 250) or ITU-T Rec G.107
E-model- 2001 : ITU-T Rec P.862
PESQ (Perceptual Evaluation of Speech Quality)Advanced Standard from PSQM Algorithm
- 2003 : ITU-T Rec P.862.1PESQ (Perceptual Evaluation of Speech Quality)Advanced Standard from PSQM Algorithm
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PESQ algorithm in WLPESQ algorithm in WL’’s solutions solution
LevelAlign
LevelAlign
InputFilter
InputFilter
CrudeAlign
UtteranceTimeAlign
+Equalize
AuditoryTransform
DisturbanceProcessing
AuditoryTransform
BadIntervals
Speech QualityMeasurement
ReferenceWave File
Received(Recorded)Wave File
Re-align bad interval
: New in PESQ algorithm
: Same or Similar with PSQM
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MOS in PESQ algorithmMOS in PESQ algorithm•Description in ITU-T P.862
DeviceUnder Test
Originalinput
Degraded output
Subject Model
•Description in ITU-T P.862
Bark frequencyBark frequency
Bark frequency Bark frequency
Reference Wave
Received Wave
Bark frequency
Modeling (42 bark bin)
Modeling (42 bark bin)
MOS Calculation
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Tone
Recording Start Recording End
Clip interval time (Recording Start ~ End)
MOS Calculation
Actual scope of generated MOS value with the Clip interval settings
MOS Wave ProcessMOS Wave Process•Scope verification of value generated from Reference wave
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MOS Statistics in PESQMOS Statistics in PESQ
1.62.2GSM-EFR mobile network(very poor condition)
2.9 ~ 3.63.1 ~ 3.6GSM-EFR mobile network
4.03.5GSM FR codec (13kbit/s)
4.03.9GSM EFR codec (12.2kbit/s)
3.43.5G.723.1 codec (6.3kbit/s)
3.73.6G.729 codec (8kbit/s)
3.93.8G.728 codec (16kbit/s)
4.24.1Analog network (G.711)
4.44.3Clean ISDN network
ITU P.862.1ITU P.862Network Condition
•Correlation Plot between PESQ MOS and MOS that is measured by people in a standard MOS test.
•Example Voice Quality tested per different networks
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WLWL’’s MOS Test Solutions MOS Test Solution
•Data Collecting Tool- XCAL-W : 1 MOS Test Call + 1 more Voice or Data Call
S/W based MOS Solution- OPTis-M : 4 MOS Test Calls + 4 more Voice or Data Calls
H/W based MOS Solution
•Post-processing Tool- XCAP-W
XCAL-W OPTis-M XCAP-W
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MOS Test SettingMOS Test Setting•Normal Voice Call Setting •Additional MOS Setting
MOS Test Count
MOS Algorithm
MOS Quality Detection
Wave File Information
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MOS Measurement (1)MOS Measurement (1)•MOS Parameter Information •MOS Chart
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•MOS Result Statistics- Call by Call- Each MOS Attempt
MOS Measurement (2)MOS Measurement (2)
Call by Call Statistics-Average MOS-Average RF Signal Info
Statistics per Each MOS Measurement-Each MOS-Each RF Signal Info
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MOS Measurement (3)MOS Measurement (3)•Real-Time Mapping with RF Signal Information
•MOS connected with Serving Cell info •MOS & RF Signals Mapping simultaneously
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Embedded MOS functionality (1)Embedded MOS functionality (1)•MOS is embedded (optional) at XCAL-W with other common functionality compatible
GSM MOS SCREEN
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•MOS is embedded (optional) at XCAL-W with other common functionality compatibleUMTS MOS SCREEN
Embedded MOS functionality (2)Embedded MOS functionality (2)
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MOS Plot in XCAPMOS Plot in XCAP--WW•MOS Plot Analysis in post-processing tool
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Notice 5 Low MOS spikes can be attributed to low Rx Lev
MOS Chart in XCAPMOS Chart in XCAP--W (1)W (1)•MOS Chart Analysis in post-processing tool GSM MOS Analysis
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Zoom In
On the condition of poor Ec/No, RSCP & high BLER, MOS Value was degraded
UMTS MOS Analysis•MOS Chart Analysis in post-processing tool
MOS Chart in XCAPMOS Chart in XCAP--W (2)W (2)
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Low Score of MOS is caused by Poor RF Environment
Poor MOS Example in XCAPPoor MOS Example in XCAP--W (1)W (1)GSM MOS Analysis•Poor MOS Analysis in Mapping Plot
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UMTS MOS Analysis•Poor MOS Analysis in Mapping Plot
Poor MOS Example in Poor MOS Example in XCAPXCAP--W (2)W (2)
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LCG (Local Call Generator)LCG (Local Call Generator)
PSTN #1
PSTN #2
PSTN #3
PSTN #4
PSTN #5
PSTN #6
PSTN #7
PSTN #8
•Local Call Generator Configuration- 8 Land Phone Lines at Maximum Simultaneously- Call Origination to OPTis-M or XCAL-W- Call Reception from OPTis-M or XCAL-W
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Select the scenario by checking
or not checking the corresponding
Checkbox from the scenario list
Display dialing number of the scenarioDial Number
Display either origination or termination mode of the scenarioSimplex-Inbound- Termination ModeSimplex-Outbound- Origination Mode
OP. Mode
Display whether or not the scenariocalculates MOS.
Calc. MOS
Display phone number of the selected port from the scenario
Display channel from the scenario
Scenario Information Table item list
Local Number
CH
Execute operation like
add, remove on selected
items.
LCG Call SettingLCG Call Setting•Call Test Setting
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Display the file path of the recorded wave
Display the content of the current event
Display the time of the event status
Table item explanation
Contents
Status
Time
Display information based on the Channel for each scenario
Sheet B0:P0
LCG Call StatisticsLCG Call Statistics•Call Statistics in LCG
- MOS Calculation in uplink voice quality in aspect of mobile phone- Call Access, Call Fail, Call Success, Call Drop Rate Measurement
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