calidad del servicio – uit

Cartagena de Indias, Colombia, 23-24 September 2013 1

Overview of ITU-T Study Group 12 Activities on QoS and QoE

Joachim Pomy, SG 12 Rapporteur

Consultant, Opticom GmbH

[email protected]

CITEL (PCC.I)/ ITU Forum on Information and Communication Technology Service:

Quality, Control and Surveillance

(Cartagena de Indias, Colombia, 23-24 September 2013)


Where it All Begins: Real Communication Situation


... and where Technology comes to Play: Employing a Telecommunication System


SG 12 Key History Events (1)

Established in 1957

Separate SG 16 for Transmission Planning Old 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 WP Subjective & 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.


SG 12 Key History Events (2)

Since 1997 Video Quality Experts Group (VQEG) With a nucleus of subjective and objective video quality expertise from SG12 SG12 still maintains close contact with VQEG

Since the early 1990s work in SG 12 has expanded Into many new technology areas

ATM VoIP Multimedia Digital wireless IP QoS classes Ethernet IPTV, etc. Network Performance Resource Management.

Since 2008 SG12 was given responsibility for Operational aspects of telecommunication network service quality Responsibility for the QoS Development Group (QSDG).


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 services ranging 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 QoE end-to-end quality aspects of interoperability development 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







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-series http://www.itu.int/ITU-T/recommendations/index_sg.aspx?sg=12

http://www.itu.int/ITU-T/recommendations/index_sg.aspx?sg=12




SG 12 Leading Team

Chairman Kwame Baah-Acheamfuor (Ghana)

Vice Chairmen Paul 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 Support Hiroshi Ota, Counsellor Sarah Scott, Assistant


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)


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 Group Yvonne Umutoni, Chair

Regional Group for Africa Gamal Amin Elsayed, Chair


CarCom Focus Group

In car communication Quality 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?


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


Work Programme (1/8)

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



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



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



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



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



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



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



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


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 Contributions

20 November 2013 http://www.itu.int/net/ITU-T/ddp/Default.aspx?groupid=T13-SG12

http://www.itu.int/net/ITU-T/ddp/Default.aspx?groupid=T13-SG12






e-Learning Course on Mobile QoS -1

Currently under Development

based on draft new Rec. ITU-T E.MQoS

Under the Umbrella of ITU Academy http://academy.itu.int/

Other Courses available. e.g.

Working Methods of ITU-T Study Groups http://academy.itu.int/index.php/component/k2/item/1115

http://academy.itu.int/

http://academy.itu.int/index.php/component/k2/item/1115


e-Learning Course on Mobile QoS-2

Objectives Better understanding of QoS seen from the end user perspective

Target Audience Telecommunication Engineers Telecoms Managers Decision Makers engaged with relevant stakeholders:

Mobile Operators National Regulators Customer Organizations Industry Organization (regional) SDOs.

Required Knowledge Level before Course Basic QoS concepts Perceptual models

Skills gained by attending the Course Ability to understand Mobile QoS from an end user perspective superior to the operation and maintanence parameters of mobile networks



Module 1: Assessment of Quality of Service Introduction 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



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 services Store-and-forward services Information services Push services

Module 5: Definition of typical measurement profiles

Introduction of measurement profiles One focus is on main factors affecting comparability



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



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


Any questions ?

Joachim Pomy Telecommunications & Int'l Standards Germany Tel.: +49 177 78 71958 Email: [email protected]

calidad del servicio – uit

Business

separate sg

time sg

later sg

presentday sg

lead sg

quality of service qos

quality requirements

quality of experience