ITU-T G 1080-2008 Quality of experience requirements for IPTV services (Study Group 12)《网络电视(IPTV)业务的体验质量要求 12研究组》.pdf
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1、 International Telecommunication Union ITU-T G.1080TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (12/2008) SERIES G: TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS Multimedia quality of service and performance Generic and user-related aspects Quality of experience requirements for IP
2、TV services Recommendation ITU-T G.1080 ITU-T G-SERIES RECOMMENDATIONS TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS INTERNATIONAL TELEPHONE CONNECTIONS AND CIRCUITS G.100G.199 GENERAL CHARACTERISTICS COMMON TO ALL ANALOGUE CARRIER-TRANSMISSION SYSTEMS G.200G.299 INDIVIDUAL CHARACTERI
3、STICS OF INTERNATIONAL CARRIER TELEPHONE SYSTEMS ON METALLIC LINES G.300G.399 GENERAL CHARACTERISTICS OF INTERNATIONAL CARRIER TELEPHONE SYSTEMS ON RADIO-RELAY OR SATELLITE LINKS AND INTERCONNECTION WITH METALLIC LINES G.400G.449 COORDINATION OF RADIOTELEPHONY AND LINE TELEPHONY G.450G.499 TRANSMISS
4、ION MEDIA AND OPTICAL SYSTEMS CHARACTERISTICS G.600G.699 DIGITAL TERMINAL EQUIPMENTS G.700G.799 DIGITAL NETWORKS G.800G.899 DIGITAL SECTIONS AND DIGITAL LINE SYSTEM G.900G.999 MULTIMEDIA QUALITY OF SERVICE AND PERFORMANCE GENERIC AND USER-RELATED ASPECTS G.1000G.1999 TRANSMISSION MEDIA CHARACTERISTI
5、CS G.6000G.6999 DATA OVER TRANSPORT GENERIC ASPECTS G.7000G.7999 PACKET OVER TRANSPORT ASPECTS G.8000G.8999ACCESS NETWORKS G.9000G.9999 For further details, please refer to the list of ITU-T Recommendations. Rec. ITU-T G.1080 (12/2008) i Recommendation ITU-T G.1080 Quality of experience requirements
6、 for IPTV services Summary Recommendation ITU-T G.1080 defines user requirements for quality of experience (QoE) for Internet protocol television (IPTV) services. The QoE requirements are defined from an end user perspective and are agnostic to network deployment architectures and transport protocol
7、s. The QoE requirements are specified as end-to-end and information is provided on how they influence network transport and application layer behaviour. QoE requirements for video, audio, text, graphics, control functions and meta-data are provided. Compression coding schemes addressed in this Recom
8、mendation are examples, and detailed numeric values as performance targets, e.g., bit rate, packet loss rate, are also examples. The readers may appropriately choose or replace these parameter values in order to be consistent with the requirements of each IPTV service context to which they are inten
9、ded to be applied. Source Recommendation ITU-T G.1080 was approved on 7 December 2008 by ITU-T Study Group 12 (2009-2012) under Recommendation ITU-T A.8 procedure. Keywords IPTV, QoE, QoS. ii Rec. ITU-T G.1080 (12/2008) FOREWORD The International Telecommunication Union (ITU) is the United Nations s
10、pecialized agency in the field of telecommunications, information and communication technologies (ICTs). The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of ITU. ITU-T is responsible for studying technical, operating and tariff questions and issuing Recommendations on th
11、em with a view to standardizing telecommunications on a worldwide basis. The World Telecommunication Standardization Assembly (WTSA), which meets every four years, establishes the topics for study by the ITU-T study groups which, in turn, produce Recommendations on these topics. The approval of ITU-
12、T Recommendations is covered by the procedure laid down in WTSA Resolution 1. In some areas of information technology which fall within ITU-Ts purview, the necessary standards are prepared on a collaborative basis with ISO and IEC. NOTE In this Recommendation, the expression “Administration“ is used
13、 for conciseness to indicate both a telecommunication administration and a recognized operating agency. Compliance with this Recommendation is voluntary. However, the Recommendation may contain certain mandatory provisions (to ensure e.g., interoperability or applicability) and compliance with the R
14、ecommendation is achieved when all of these mandatory provisions are met. The words “shall“ or some other obligatory language such as “must“ and the negative equivalents are used to express requirements. The use of such words does not suggest that compliance with the Recommendation is required of an
15、y party. INTELLECTUAL PROPERTY RIGHTS ITU draws attention to the possibility that the practice or implementation of this Recommendation may involve the use of a claimed Intellectual Property Right. ITU takes no position concerning the evidence, validity or applicability of claimed Intellectual Prope
16、rty Rights, whether asserted by ITU members or others outside of the Recommendation development process. As of the date of approval of this Recommendation, ITU had not received notice of intellectual property, protected by patents, which may be required to implement this Recommendation. However, imp
17、lementers are cautioned that this may not represent the latest information and are therefore strongly urged to consult the TSB patent database at http:/www.itu.int/ITU-T/ipr/. ITU 2009 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior writ
18、ten permission of ITU. Rec. ITU-T G.1080 (12/2008) iii CONTENTS Page 1 Scope 1 2 References. 1 3 Definitions 2 3.1 Terms defined elsewhere 2 3.2 Terms defined in this Recommendation. 2 4 Abbreviations and acronyms 2 5 Introduction to QoE 4 6 QoE for video and audio. 6 6.1 Requirements for media comp
19、ression and synchronization. 6 6.2 Impact of network transmission on performance . 11 7 QoE for text and graphics. 12 7.1 Media component text 12 7.2 Media component graphics. 13 8 QoE for control functions . 14 8.1 QoE requirements for channel zapping time 14 8.2 QoE requirements related to VoD tri
20、ck mode 16 9 QoE for other IPTV services 16 9.1 QoE requirements for metadata 16 9.2 QoE requirements for browser . 17 9.3 QoE requirements for content navigation. 18 10 Accessibility requirements 18 11 Security considerations. 18 Appendix I Network QoS parameters affecting QoE . 19 Appendix II Non-
21、inclusive list of audio and video codecs. 20 II.1 Video codecs 20 II.2 Audio codecs 20 Appendix III Supplementary information related to the selected provisional performance parameters 21 III.1 Introduction 21 III.2 Standard definition TV (SDTV): General minimum objectives 21 III.3 Standard definiti
22、on (SD) TV: VoD and premium content objectives 23 III.4 High definition TV (HDTV): Objectives . 24 Appendix IV Impact of transmission impairments on quality 26 IV.1 Introduction 26 IV.2 Standard definition video . 28 iv Rec. ITU-T G.1080 (12/2008) Page IV.3 High definition TV . 30 IV.4 Plots of pack
23、et loss ratio vs bits sent 31 IV.5 Severe error limits for SDTV and HDTV services 33 Bibliography. 35 Rec. ITU-T G.1080 (12/2008) 1 Recommendation ITU-T G.1080 Quality of experience requirements for IPTV services 1 Scope This Recommendation defines user requirements for quality of experience (QoE) f
24、or IPTV services. The QoE requirements are defined from an end-user perspective and are agnostic to network deployment architectures and transport protocols. The QoE requirements are specified for the end-to-end service and information is provided on how they influence network transport and applicat
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