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Cartagena de Indias, Colombia, 23-24 September 20131
Overview of ITU-T Study Group 12 Activities on QoS and QoE
Joachim Pomy, SG 12 Rapporteur
Consultant, Opticom GmbH
Consultant@joachimpomy.de
CITEL (PCC.I)/ ITU Forum on Information andCommunication Technology Service:
Quality, Control and Surveillance
(Cartagena de Indias, Colombia, 23-24 September 2013)
Cartagena de Indias, Colombia, 23-24 September 20132
Where it All Begins:Real Communication Situation
Cartagena de Indias, Colombia, 23-24 September 20133
... and where Technology comes to Play:Employing a Telecommunication System
Cartagena de Indias, Colombia, 23-24 September 20134
SG 12 Key History Events (1)
Established in 1957
Separate SG 16 for Transmission PlanningOld SG 12 just did subjective testing & telephone standards
At CCITT Plenary Assembly in 1984, these SGs were merged to form the present-day SG 12
During same time SG 12 had a Laboratory WPSubjective & objective testing for loudness of telephones
In the CCITT Laboratory in Geneva - closed in 1988
Since 1986 Speech Quality Experts Group (SQEG)To better provide the quality requirements and subjective testing for speech coding algorithms standardized by SG 18 (later SG 15, now SG 16)
Key role in the standardization of all of the G.711-G.729 speech and audio codecs, and still exists as Q7/12.
Cartagena de Indias, Colombia, 23-24 September 20135
SG 12 Key History Events (2)
Since 1997 Video Quality Experts Group (VQEG) With a nucleus of subjective and objective video quality expertise from SG12SG12 still maintains close contact with VQEG
Since the early 1990s work in SG 12 has expandedInto many new technology areas
ATMVoIPMultimediaDigital wirelessIP QoS classesEthernetIPTV, etc.Network PerformanceResource Management.
Since 2008 SG12 was given responsibility forOperational aspects of telecommunication network service qualityResponsibility for the QoS Development Group (QSDG).
Cartagena de Indias, Colombia, 23-24 September 20136
SG 12 Mandate
Performance, QoS and QoE
Responsible for Recommendations on performance, quality of service (QoS) and quality of experience (QoE) for
full spectrum of terminals, networks and servicesranging from speech over fixed circuit-based networks to multimedia applications over networks that are mobile and packet based
Included are operational aspects of performance, QoS and QoEend-to-end quality aspects of interoperabilitydevelopment of multimedia quality assessment methodologies, both subjective and objective.
SG 12 is the Lead SG on quality of service and quality of experience driver distraction and voice aspects of car communications
http://www.itu.int/en/ITU-T/studygroups/2013-2016/12/Pages/default.aspx
Cartagena de Indias, Colombia, 23-24 September 20137
SG 12 Recommendations
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-serieshttp://www.itu.int/ITU-T/recommendations/index_sg.aspx?sg=12
Cartagena de Indias, Colombia, 23-24 September 20138
SG 12 Leading Team
ChairmanKwame Baah-Acheamfuor (Ghana)
Vice ChairmenPaul Barrett (United States)Vinvent Barriac (France)Gamal Amin Elsayed (Sudan)Hyung-Soo Kim (Republic of Korea)Al Morton (United States)Qi Feng (China)José Guadalupe Rojas Ramírez (Mexico)Akira Takahashi (Japan)Hassan Talib (Morocco)
TSB SupportHiroshi Ota, CounsellorSarah Scott, Assistant
Cartagena de Indias, Colombia, 23-24 September 20139
Working Parties
WP 1 Terminals and multimedia subjective assessment
CHAIR: Lars Birger Nielsen (Denmark)VICE CHAIR: Gunilla Berndtsson (Sweden)
WP 2 Objective models and tools for multimedia quality
CHAIR: Paul Barrett (United States)VICE CHAIR: Vincent Barriac (France)
WP 3 Multimedia QoS and QoE
CHAIR: Paul Coverdale (China)VICE CHAIR: Akira Takahashi (Japan)
Cartagena de Indias, Colombia, 23-24 September 201310
Groups overseen by SG12
CarCom Focus Group (closed in 2013)
Hans Gierlich, Chair
Driver Distraction Focus Group (closed in 2013)
Scott Pennock, Chair
QoS Development GroupYvonne Umutoni, Chair
Regional Group for AfricaGamal Amin Elsayed, Chair
Cartagena de Indias, Colombia, 23-24 September 201311
CarCom Focus Group
In car communicationQuality parameters & testing methods
Interaction of car hands free systems with radio
Requirements on sub-system level
Requirements and testing procedures for super-wideband and fullband systems
Interaction with other audio components and systems in the car
Special requirements/testing procedures for speech recognition systems in cars
Quality models: what and how can be applied for the car environment?
Cartagena de Indias, Colombia, 23-24 September 201312
QoS Development Group
Encourages wider participation in international QoS activities
Identifies and develop performance monitoring activities for QoS
Identifies procedures & practices for inclusion in the ITU-T Rec.s
Disseminates information relating to QoS techniques & procedures
Development of coordinated approach to study of QoS
Pursues other activities which may improve international QoS
Cartagena de Indias, Colombia, 23-24 September 201313
Work Programme (1/8)
Coordination of QoS/performance studiesCommunications Quality of Service: A framework and definitionsVocabulary for performance and quality of serviceMean Opinion Score (MOS) terminologyTransmission characteristics for wideband digital handset and headset telephones - Inclusion of extended wideband terminalsTransmission characteristics for cordless and moblie digital terminalsTransmission characteristics for wideband digital loudspeaking and hands-free telephony terminals - Inclusion of extended wideband terminalsTechnical requirements and test methods for the universal wired headset or headphone interface of digital mobile terminalsNarrowband hands-free communication in motor vehiclesWideband hands-free communication in motor vehicles
Cartagena de Indias, Colombia, 23-24 September 201314
Work Programme (2/8)
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
Cartagena de Indias, Colombia, 23-24 September 201315
Work Programme (3/8)
Test signals for use in telephonometryObjective test methods for speech communication systems using complex test signalsMethods for determining the ‘Objective Quality Number’ as overall quality value for terminalsApplicability of psycho-acoustic models to HATS based setups for the benefit of terminal testingSetup signals for terminal with background noiseSubjective quality evaluation of telephone services based on spoken dialogue systemsSubjective performance of active signal processing devicesCultural/language/nationality dependence of subjective qualitySubjective evaluation of generic sound activity detectorsMultidimensional scaling quality assessmentSubjective assessment methods for music quality of narrowband and wideband telephony
Cartagena de Indias, Colombia, 23-24 September 201316
Work Programme (4/8)
Test methodology for web browsing and browser based applicationsSubjective usability evaluation of speech-based or multimodal interactive servicesQ.7/12 defines test plans for tests of speech coders, and reports the test results and analysisE-model extension for non-handset user interfacesE-model extension for speech processing devicesE-model update for conversational quality featuresMixed-band and beyond-wideband E-modelE-model for monitoringOperational quality estimatorPerceptual approaches for multi-dimensional analysisPerceptual objective noise reduction
Cartagena de Indias, Colombia, 23-24 September 201317
Work Programme (5/8)
Perceptual Objective Prediction of Speech IntelligibilityNo-reference models for quality predictionSubjective method for simulated conversation tests addressing audio and audiovisual call qualityEffect of delays on the telemeeting qualityUse of auditory and visual cues for high-quality telemeetingsOverall telemeeting quality value (long term goal)Quality implications and requirements for telemeeting and conferencing servicesSpatial audio meetings quality evaluationFrequent updates of AppendicesQuality of Experience aspects of Multi ConnectionEnd-to-end QoE aspects of tandemmed speech processing devices
Cartagena de Indias, Colombia, 23-24 September 201318
Work Programme (6/8)
End-to-end performance for managed voice over LTE networksThis 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 serviceMobile QoSSupplement XX to ITU-T E.800-series Recommendations (Guidelines on Regulatory Aspects of QoS)End-user multimedia QoS categoriesNetwork model for evaluating multimedia transmission performance over Internet ProtocolOpinion model for video and audio streaming applicationsQoE of Web-browsingQoE requirements for multicast video streaming servicesQoE requirements for telepresence servicesGuidance for the use of P.1201 and P.1202 in operational contexts
Cartagena de Indias, Colombia, 23-24 September 201319
Work Programme (7/8)
QoE-diagnostic information from P.120X.Y type models on technical causes of QoE impairmentsIntegral index of quality for general service monitoring (per user-session); KQI definitionsMedia-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 integrationParametric non-intrusive assessment of TCP-based multimedia streaming quality, considering adaptive streamingIn-service non-intrusive measurement device – Voice service measurementsAnalysis and interpretation of INMD voice-service measurementsConformance testing for voice over IP transmission quality assessment modelsConversational modelFramework for invoking diagnostic functionsVoice Service Diagnosis Framework
Cartagena de Indias, Colombia, 23-24 September 201320
Work Programme (8/8)
Technical cause analysisBuffer models for development of client performance metricsHand-over performance among multiple access networksInternet protocol data communication service – IP packet transfer and availability performance parametersNetwork performance objectives for IP-based servicesMeasurements in IP networks for inter-domain performance assessmentEthernet frame transfer and availability performanceEthernet service activation test methodologyHome network performance parametersProposed Appendices for Y.1566 : QoS mapping and interworking between Ethernet, IP and MPLS
Cartagena de Indias, Colombia, 23-24 September 201321
Cannot find your Topic ?
Work in ITU-T is contribution driven !
Next Meeting of Study Group 12
3 – 12 December 2013 in Geneva
Deadline for Contributions20 November 2013
http://www.itu.int/net/ITU-T/ddp/Default.aspx?groupid=T13-SG12
Cartagena de Indias, Colombia, 23-24 September 201322
e-Learning Course on Mobile QoS -1
Currently under Development
based on draft new Rec. ITU-T E.MQoS
Under the Umbrella of ITU Academyhttp://academy.itu.int/
Other Courses available. e.g.
Working Methods of ITU-T Study Groupshttp://academy.itu.int/index.php/component/k2/item/1115
Cartagena de Indias, Colombia, 23-24 September 201323
e-Learning Course on Mobile QoS-2
ObjectivesBetter understanding of QoS seen from the end user perspective
Target AudienceTelecommunication EngineersTelecoms ManagersDecision Makers engaged with relevant stakeholders:
Mobile OperatorsNational RegulatorsCustomer OrganizationsIndustry Organization(regional) SDOs.
Required Knowledge Level before CourseBasic QoS concepts Perceptual models
Skills gained by attending the CourseAbility to understand Mobile QoS from an end user perspective superior to the operation and maintanence parameters of mobile networks
Cartagena de Indias, Colombia, 23-24 September 201324
e-Learning Course on Mobile QoS-3
Module 1: Assessment of Quality of ServiceIntroduction to the relation between performance, QoS and QoE and their assessment and standardization
Module 2: Definition of Quality of Service parameters and their computation
Introduction to the four-layer model for mobile QoS parameters
Module 3: Typical procedures for Quality of Service measurement equipment
Cartagena de Indias, Colombia, 23-24 September 201325
e-Learning Course on Mobile QoS-4
Module 4: Requirements for Quality of Service measurement equipment
Test equipment for mobile QoS cannot be standardized. Therefore, this module provides an introduction to tests which are based on emulation of a typical user Introduction to different Test scenarios:
User-to-user servicesStore-and-forward servicesInformation servicesPush services
Module 5: Definition of typical measurement profiles
Introduction of measurement profilesOne focus is on main factors affecting comparability
Cartagena de Indias, Colombia, 23-24 September 201326
e-Learning Course on Mobile QoS-5
Module 6: Post processing and statistical methods
Introduction to appropriate data analysis methods
Different data types are introduced
Four general categories of measurement results:Data with binary values
Data out of time-interval measurements
Measurement of data throughput
Data concerning quality measures
Module 7: Network based Quality of Service measurements
This final module introduces network based QoS measurement
Cartagena de Indias, Colombia, 23-24 September 201327
e-Learning Course on Mobile QoS-6
Verification of the Learning Progress
Number of Questions at intermediate Stages
at the end of Modules
at the end of the Course
Automatic Generation of Certificate
upon successful completion of Course
Cartagena de Indias, Colombia, 23-24 September 201328
Any questions ?
Joachim PomyTelecommunications & Int'l StandardsGermanyTel.: +49 177 78 71958Email: consultant@joachimpomy.de
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