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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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Thank you!!