ITU Workshop on “Quality of Service and
Quality of Experience of Multimedia Services in
Emerging Networks”
(Istanbul, Turkey, 9-11 February 2015)
Overview of ITU-T Study Group 12
Recommendations on QoS and QoE
Joachim Pomy,
Senior Engineer, Opticom GmbH Germany
Consultant@joachimpomy.de
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SG 12 Recommendations
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E.420-E.479, E.800-E.859
G.100-series, except G.160-, G.180- and G.190-series
G.1000-series
I.350-series (including Y.1501/G.820/I.351), I.371,
I.378, I.381
• P-series, except P.900-series
• Y.1220-, Y.1530-, Y.1540-, Y.1560-series
http://www.itu.int/ITU-T/recommendations/index_sg.aspx?sg=12
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Work Programme (1/8)
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Coordination of QoS/performance studies
Communications Quality of Service: A framework and definitions
Vocabulary for performance and quality of service
Mean Opinion Score (MOS) terminology
Transmission characteristics for wideband digital handset and headset telephones
- Inclusion of extended wideband terminals
Transmission characteristics for cordless and moblie digital terminals
Transmission characteristics for wideband digital loudspeaking and hands-free
telephony terminals - Inclusion of extended wideband terminals
Technical requirements and test methods for the universal wired headset or
headphone interface of digital mobile terminals
Narrowband hands-free communication in motor vehicles
Wideband hands-free communication in motor vehicles
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P.800.1 Relation between some MOS qualifiers
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Work Programme (2/8)
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User interface requirements for automotive applications
Subsystem requirements for automotive speech services
Artificial ears
Calculation of loudness ratings for telephone sets
Use of head and torso simulator (HATS) for hands-free and handset terminal
testing
Bone conduction testing setup
Multiple test positions setup
Setups and testing techniques for terminal performance measurements with
background noise
Artificial voices
Speech processing devices for acoustic enhancement
Transmission characteristics and speech quality parameters of hands-free
terminals
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Typical development cycle for a car speakerphone hands-free
system and applicability of clauses of Rec. P.1100
Typically HFT development for a new car
Research end Pre-development end
Dev. B sample end
A sample
Dev. C sample end
B sample
Dev. D sample end
C sample
PPAP
SOP
D sample
Application of the different clauses of this Recommendation
Part 8 digital interface
Part 8 digital interface
Parts 11 and 12 HFT and SRWTEP parameters
Part 13 subjective car-to-car test
Part 10 microphone parameters
What is covered by the various parts of the test Recommendation?
Part 7: Covers test arrangements used within this Recommendation.
Part 8: Covers non-mandatory objective measurements using a digital interface.
Part 9: Covers test signals used within this Recommendation.
Part 10: Covers non-mandatory objective measurements of the microphone or/and microphone system.
Part 11: Covers mandatory objective measurements of the hands-free terminal (HFT).
Part 12: Covers non-mandatory objective measurements of short-range wireless transmission enabled phone (SRWTEP).
Part 13: Covers non-mandatory subjective evaluation of the hands-free terminal (HFT).
P.1110(09)_F6-1
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Work Programme (3/8)
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Test signals for use in telephonometry
Objective test methods for speech communication systems using complex test
signals
Methods for determining the ‘Objective Quality Number’ as overall quality value
for terminals
Applicability of psycho-acoustic models to HATS based setups for the benefit of
terminal testing
Setup signals for terminal with background noise
Subjective quality evaluation of telephone services based on spoken dialogue
systems
Subjective performance of active signal processing devices
Cultural/language/nationality dependence of subjective quality
Subjective evaluation of generic sound activity detectors
Multidimensional scaling quality assessment
Subjective assessment methods for music quality of narrowband and wideband
telephony
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Rating scales used in ITU-T P.806 subjective testing
methodology
P.MULTI Perceptual Quality Scales
PQ Scales
S-FLT
S-RUF
S-LFC
S-HFC
B-LVL
B-VAR
Description
Slow-varying Degradation in the
Speech Signal
Fast-varying Degradation in the
Speech Signal
Degradation of Low-Frequency
Coloration in the Speech Signal
Degradation of High-frequency
Coloration in the Speech Signal
Degradation due to the Level of
Background Noise
Degradation due to the Variability
of the Background Noise
Scale Descriptors
fluttering, babbling,
discontinuous
rough, raspy, harsh
dull, muffled, smothered
small, distant, thin
hissing, rushing, roaring
bubbling, intermittent,
variable
Overall Scales
Description
LOUD
Overall Loudness in the Speech Signal + Background Noise
OVRL
Overall Quality in the Speech Signal + Background Noise
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Work Programme (4/8)
• Test methodology for web browsing and browser based applications
• Subjective usability evaluation of speech-based or multimodal interactive
services
• Q.7/12 defines test plans for tests of speech coders, and reports the test
results and analysis
• E-model extension for non-handset user interfaces
• E-model extension for speech processing devices
• E-model update for conversational quality features
• Mixed-band and beyond-wideband E-model
• E-model for monitoring
• Operational quality estimator
• Perceptual approaches for multi-dimensional analysis
• Perceptual objective noise reduction
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Test setup for Rec. P.1501 Quality of web
browsing
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Work Programme (5/8)
• Perceptual Objective Prediction of Speech Intelligibility
• No-reference models for quality prediction
• Subjective method for simulated conversation tests addressing audio and
audiovisual call quality
• Effect of delays on the telemeeting quality
• Use of auditory and visual cues for high-quality telemeetings
• Overall telemeeting quality value (long term goal)
• Quality implications and requirements for telemeeting and conferencing
services
• Spatial audio meetings quality evaluation
• Frequent updates of Appendices
• Quality of Experience aspects of Multi Connection
• End-to-end QoE aspects of tandemmed speech processing devices
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Rec. P.1301 Decision tree for Subjective quality evaluation
of audio and audiovisual multiparty telemeetings
Start
Communication
mode including text / graphics
(e. g., web
conferencing) ?
Yes
ITU-T P.1301 Annex B
No
Audio
Communication
mode?
Video
ITU-T P.1301 Annex C
Audiovisual
Test mode
= audio
Test mode
= video
Audio
Video
Test
mode?
Audio-visual
Type of
quality?
Conversational
Continue with
Flowchart B
Type of
quality?
Noninteractive
Continue with
Flowchart C
Conversational
Continue with
Flowchart D
Type of
quality?
Noninteractive
Continue with
Flowchart E
Conversational
Special test
method required
Noninteractive
Continue with
Flowchart F
P.1301(12)_FA
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Work Programme (6/8)
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End-to-end performance for managed voice over LTE networks This
Recommendation describes the key aspects impacting end-to-end performance of
managed voice applications over LTE networks.
Definitions and associated measurement methods for user-centric parameters for
call handling in cellular mobile voice service
Mobile QoS
Supplement XX to ITU-T E.800-series Recommendations (Guidelines on Regulatory
Aspects of QoS)
End-user multimedia QoS categories
Network model for evaluating multimedia transmission performance over Internet
Protocol
Opinion model for video and audio streaming applications
QoE of Web-browsing
QoE requirements for multicast video streaming services
QoE requirements for telepresence services
Guidance for the use of P.1201 and P.1202 in operational contexts
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Rec. G.1010 – Model for user-centric QoS
categories
Error
tolerant
Conversational
voice and video
Voice/video
messaging
Streaming audio
and video
Fax
Error
intolerant
Command/control
(e.g. Telnet,
interactive games)
Transactions
(e.g. E-commerce,
WWW browsing,
Email access)
Messaging,
Downloads
(e.g. FTP, still image)
Background
(e.g. Usenet)
Interactive
(delay <<1 s)
Responsive
(delay ~2 s)
Timely
(delay ~10 s)
Non-critical
(delay >>10 s)
T1213060-02
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Work Programme (7/8)
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QoE-diagnostic information from P.120X.Y type models on technical causes of QoE
impairments
Integral index of quality for general service monitoring (per user-session); KQI definitions
Media-session QoE model (temporal pooling, long sequences; UDP- and TCP-based
streaming)
Parametric non-intrusive assessment of audiovisual progressive download, considering
stalling/re-buffering & quality integration
Parametric non-intrusive assessment of TCP-based multimedia streaming quality, considering
adaptive streaming
In-service non-intrusive measurement device – Voice service measurements
Analysis and interpretation of INMD voice-service measurements
Conformance testing for voice over IP transmission quality assessment models
Conversational model
Framework for invoking diagnostic functions
Voice Service Diagnosis Framework
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Rec. G.1029 - Voice Service Diagnosis Framework
Terminals
Framework for invoking diagnostic functions
(Work Item 1)
QoE/QoS
Decision
parameters
Decision
process
Invocation
network
QoE/QoS
Diagnostic
parameters
Diagnostic
parameter to
root-cause
mapping
Framework for mapping diagnostic parameters to
root-cause parameters (Work Item 2)
Remedial
action
QoE/QoS
Root-cause
analaysis
application
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QoE/QoS
Root-cause
analysis
parameters
Work Programme (8/8)
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Technical cause analysis
Buffer models for development of client performance metrics
Hand-over performance among multiple access networks
Internet protocol data communication service – IP packet transfer and
availability performance parameters
Network performance objectives for IP-based services
Measurements in IP networks for inter-domain performance assessment
Ethernet frame transfer and availability performance
Ethernet service activation test methodology
Home network performance parameters
Proposed Appendices for Y.1566 : QoS mapping and interworking between
Ethernet, IP and MPLS
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Cannot find your Topic ?
• Work in ITU-T is contribution driven !
• It is up to Y O U !!!!!
• Next Meeting of Study Group 12
– 5 – 14 May 2015 in
Geneva (Switzerland)
– Deadline for Contributions
• 22 April 2015
– http://www.itu.int/net/ITU-T/ddp/Default.aspx?groupid=T13-SG12
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Any questions ?
Joachim Pomy
consultant@joachimpomy.de
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