ITU-T P 1305-2016 Effect of delays on telemeeting quality (Study Group 12)《时滞对电视电话会议质量的影响(研究组12)》.pdf
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1、 I n t e r n a t i o n a l T e l e c o m m u n i c a t i o n U n i o n ITU-T P.1305 TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (07/2016) SERIES P: TERMINALS AND SUBJECTIVE AND OBJECTIVE ASSESSMENT METHODS Telemeeting assessment Effect of delays on telemeeting quality Recommendation ITU-T P.1305
2、 ITU-T P-SERIES RECOMMENDATIONS TERMINALS AND SUBJECTIVE AND OBJECTIVE ASSESSMENT METHODS Vocabulary and effects of transmission parameters on customer opinion of transmission quality Series P.10 Voice terminal characteristics Series P.30 P.300 Reference systems Series P.40 Objective measuring appar
3、atus Series P.50 P.500 Objective electro-acoustical measurements Series P.60 Measurements related to speech loudness Series P.70 Methods for objective and subjective assessment of speech quality Series P.80 Methods for objective and subjective assessment of speech and video quality Series P.800 Audi
4、ovisual quality in multimedia services Series P.900 Transmission performance and QoS aspects of IP end-points Series P.1000 Communications involving vehicles Series P.1100 Models and tools for quality assessment of streamed media Series P.1200 Telemeeting assessment Series P.1300 Statistical analysi
5、s, evaluation and reporting guidelines of quality measurements Series P.1400 Methods for objective and subjective assessment of quality of services other than speech and video Series P.1500 For further details, please refer to the list of ITU-T Recommendations. Rec. ITU-T P.1305 (07/2016) i Recommen
6、dation ITU-T P.1305 Effect of delays on telemeeting quality Summary Recommendation ITU-T P.1305 has the primary purpose of describing the impact of echo-free transmission delays on telemeeting quality of experience (QoE). Delay has a major impact on the interaction performance of conference particip
7、ants, but is not always explicitly noticed by them; its impact being commonly attributed to other participants behaviour rather than being a system feature. Before discussing the impact of the delays, it is useful to first consider how people behave when conversing in an ideal environment. Since thi
8、s has been well studied in the linguistic discipline of conversation analysis (CA), a short discussion of conversations in that context and a discussion on the impact of delay from a CA perspective is included. Some analysis based on the alternative technique of conversation surface structures is al
9、so included. A secondary purpose of this Recommendation is to provide guidance on appropriate testing methods for evaluating the effect of delay in telemeetings. History Edition Recommendation Approval Study Group Unique ID* 1.0 ITU-T P.1305 2016-07-29 12 11.1002/1000/12974 Keywords Conversation, co
10、nversation analysis, delay, subjective test, telemeeting. * To access the Recommendation, type the URL http:/handle.itu.int/ in the address field of your web browser, followed by the Recommendations unique ID. For example, http:/handle.itu.int/11.1002/1000/11830-en. ii Rec. ITU-T P.1305 (07/2016) FO
11、REWORD The International Telecommunication Union (ITU) is the United Nations specialized 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 studyi
12、ng technical, operating and tariff questions and issuing Recommendations on them 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
13、 which, in turn, produce Recommendations on these topics. The approval of ITU-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
14、 and IEC. NOTE In this Recommendation, the expression “Administration“ is used 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
15、 (to ensure, e.g., interoperability or applicability) and compliance with the Recommendation 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 w
16、ords does not suggest that compliance with the Recommendation is required of any party. INTELLECTUAL PROPERTY RIGHTSITU 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 co
17、ncerning the evidence, validity or applicability of claimed Intellectual Property 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
18、 patents, which may be required to implement this Recommendation. However, implementers 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 2016 All rights reserved. No part of this
19、publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. Rec. ITU-T P.1305 (07/2016) iii Table of Contents Page 1 Scope . 1 2 References . 1 3 Definitions 2 3.1 Terms defined elsewhere 2 3.2 Terms defined in this Recommendation . 3 4 Abbreviations and acro
20、nyms 3 5 Conventions 3 6 Existing Recommendations concerning the subjective quality evaluation in case of pure transmission delay 3 6.1 Audio delay 3 6.2 Video delay . 3 6.3 Synchronization between audio and video . 4 7 Conversation features . 4 7.1 Two-party and multi-party conversations 4 7.2 Two
21、analysis techniques . 4 7.3 Conversation analysis and turn-taking . 5 7.4 Conversation structure and styles . 7 7.5 Backchannels and other behaviours during conversations . 7 7.6 Conversation surface structure analysis . 7 8 The impact of delay 9 8.1 Turn-taking with delay . 9 8.2 Conversation surfa
22、ce structure and delays . 10 8.3 Multiparty and two-party conversations with delay . 11 8.4 Other side-impacts of delay 11 9 Factors influencing the impact of pure delay . 11 9.1 Audiovisual telemeetings . 11 9.2 User expectations 12 9.3 Asymmetric delay between participants and co-location . 12 9.4
23、 Interpersonal influences 12 10 Testing methods 12 10.1 General comments 12 10.2 Conversational-opinion tests 13 10.3 Group interaction tests 14 10.4 Communication system effectiveness tests 16 10.5 Micro-feature tests 16 11 Areas for further research regarding the impact of delay . 17 Annex A Sugge
24、stions for free-conversation tasks 18 iv Rec. ITU-T P.1305 (07/2016) Page A.1 Holiday task 18 A.2 Role-playing games 18 A.3 “Who am I?“ Celebrity Name-Guessing Task 18 A.4 Navigation tasks . 19 A.5 Story with missing parts . 19 A.6 Building blocks task variation . 19 A.7 Survival task variations . 2
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