1、 ETSI TR 1Universal Mobile TelVideo telephony robuPerfo(3GPP TR 26.9TECHNICAL REPORT 126 922 V13.0.1 (2017elecommunications System (LTE; bustness improvements exterformance evaluation .922 version 13.0.1 Release 1317-01) (UMTS); tensions; 13) ETSI ETSI TR 126 922 V13.0.1 (2017-01)13GPP TR 26.922 ver
2、sion 13.0.1 Release 13Reference RTR/TSGS-0426922vd01 Keywords LTE,UMTS ETSI 650 Route des Lucioles F-06921 Sophia Antipolis Cedex - FRANCE Tel.: +33 4 92 94 42 00 Fax: +33 4 93 65 47 16 Siret N 348 623 562 00017 - NAF 742 C Association but non lucratif enregistre la Sous-Prfecture de Grasse (06) N 7
3、803/88 Important notice The present document can be downloaded from: http:/www.etsi.org/standards-search The present document may be made available in electronic versions and/or in print. The content of any electronic and/or print versions of the present document shall not be modified without the pr
4、ior written authorization of ETSI. In case of any existing or perceived difference in contents between such versions and/or in print, the only prevailing document is the print of the Portable Document Format (PDF) version kept on a specific network drive within ETSI Secretariat. Users of the present
5、 document should be aware that the document may be subject to revision or change of status. Information on the current status of this and other ETSI documents is available at https:/portal.etsi.org/TB/ETSIDeliverableStatus.aspx If you find errors in the present document, please send your comment to
6、one of the following services: https:/portal.etsi.org/People/CommiteeSupportStaff.aspx Copyright Notification No part may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm except as authorized by written permission of ETSI. The cont
7、ent of the PDF version shall not be modified without the written authorization of ETSI. The copyright and the foregoing restriction extend to reproduction in all media. European Telecommunications Standards Institute 2017. All rights reserved. DECTTM, PLUGTESTSTM, UMTSTMand the ETSI logo are Trade M
8、arks of ETSI registered for the benefit of its Members. 3GPPTM and LTE are Trade Marks of ETSI registered for the benefit of its Members and of the 3GPP Organizational Partners. GSM and the GSM logo are Trade Marks registered and owned by the GSM Association. ETSI ETSI TR 126 922 V13.0.1 (2017-01)23
9、GPP TR 26.922 version 13.0.1 Release 13Intellectual Property Rights IPRs essential or potentially essential to the present document may have been declared to ETSI. The information pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found in
10、ETSI SR 000 314: “Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in respect of ETSI standards“, which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web server (https:/ipr.etsi.org/). Pursuant to the ETSI IPR Policy,
11、no investigation, including IPR searches, has been carried out by ETSI. No guarantee can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web server) which are, or may be, or may become, essential to the present document. Foreword This Technica
12、l Report (TR) has been produced by ETSI 3rd Generation Partnership Project (3GPP). The present document may refer to technical specifications or reports using their 3GPP identities, UMTS identities or GSM identities. These should be interpreted as being references to the corresponding ETSI deliverab
13、les. The cross reference between GSM, UMTS, 3GPP and ETSI identities can be found under http:/webapp.etsi.org/key/queryform.asp. Modal verbs terminology In the present document “should“, “should not“, “may“, “need not“, “will“, “will not“, “can“ and “cannot“ are to be interpreted as described in cla
14、use 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of provisions). “must“ and “must not“ are NOT allowed in ETSI deliverables except when used in direct citation. ETSI ETSI TR 126 922 V13.0.1 (2017-01)33GPP TR 26.922 version 13.0.1 Release 13Contents Intellectual Property Rights 2g3
15、Foreword . 2g3Modal verbs terminology 2g3Foreword . 4g31 Scope 5g32 References 5g33 Definitions and abbreviations . 6g33.1 Definitions 6g33.2 Abbreviations . 6g34 Background 6g35 Overview of video robustness improvements extensions (VTRI_EXT) tools . 7g35.1 Introduction 7g35.2 Retransmission . 7g35.
16、3 Forward error correction 7g35.4 Reference picture selection. 7g36 Test cases and conditions . 7g36.1 QoS requirements for conversational video services 7g36.2 Channel conditions . 9g36.3 Error profiles 10g36.3.1 Introduction. 10g36.3.2 QoS LTE . 10g36.3.3 LTE-OTT 10g36.3.4 WiFi 10g36.3.5 Summary .
17、 10g36.4 Test Content . 11g37 Evaluation criteria 12g37.1 Testing configuration . 12g37.2 Performance metrics . 12g38 Results 13g38.1 Test cases 13g38.2 Simulation (RTT= 100 ms) 13g38.3 Simulation (RTT= 200 ms) 15g38.4 Simulation (RTT= 300 ms) 16g38.5 Simulation (RTT= 400 ms) 18g38.6 Summary 20g39 C
18、onclusions and recommendations 20g3Annex A: Error patterns . 22g3A.1 IMS-QoS 22g3A.2 VT-LTE OTT . 22g3A.3 VT-Wifi 24g3Annex B: Change history 28g3History 29g3ETSI ETSI TR 126 922 V13.0.1 (2017-01)43GPP TR 26.922 version 13.0.1 Release 13Foreword This Technical Report has been produced by the 3rdGene
19、ration Partnership Project (3GPP). The contents of the present document are subject to continuing work within the TSG and may change following formal TSG approval. Should the TSG modify the contents of the present document, it will be re-released by the TSG with an identifying change of release date
20、 and an increase in version number as follows: Version x.y.z where: x the first digit: 1 presented to TSG for information; 2 presented to TSG for approval; 3 or greater indicates TSG approved document under change control. y the second digit is incremented for all changes of substance, i.e. technica
21、l enhancements, corrections, updates, etc. z the third digit is incremented when editorial only changes have been incorporated in the document. ETSI ETSI TR 126 922 V13.0.1 (2017-01)53GPP TR 26.922 version 13.0.1 Release 131 Scope The present document reports the study on video telephony robustness
22、improvements extensions in Multimedia Telephony Service for IMS (MTSI) and provides recommendation on their applicability for MTSI video telephony applications. 2 References The following documents contain provisions, which, through reference in this text, constitute provisions of the present docume
23、nt. - References are either specific (identified by date of publication, edition number, version number, etc.) or non-specific. - For a specific reference, subsequent revisions do not apply. - For a non-specific reference, the latest version applies. In the case of a reference to a 3GPP document (in
24、cluding a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same Release as the present document. 1 3GPP TR 21.905: “Vocabulary for 3GPP Specifications“. 2 3GPP TS 22.105: “Services and service capabilities“. 3 3GPP TS 26.114: “IP Multimedia Subs
25、ystem (IMS); Multimedia telephony; Media handling and interaction“. 4 IETF RFC 4588: “RTP Retransmission Payload Format“, July 2006. 5 IETF RFC 6865: “Simple Reed-Solomon Forward Error Correction (FEC) Scheme for FECFRAME“, February 2013. 6 IETF RFC 5109: “RTP Payload Format for Generic Forward Erro
26、r Correction“, December 2007. 7 IETF RFC 4585: “Extended RTP Profile for Real-time Transport Control Protocol (RTCP)-Based Feedback (RTP/AVPF)“, July 2006. 8 K. Yamagishi, T. Hayashi, “Parametric Packet-Layer Model for Monitoring Video Quality of IPTV Services“, IEEE ICC 2008, pp. 110-114, May 2008.
27、 9 Q. Huynh-Thu, M. Ghanbari, “Impact of Jitter and Jerkiness on Perceived Video Quality“, Proc. of the Second International Workshop on Video Processing and Quality Metrics for Consumer Electronics (VPQM), 2006. 10 C. Wang, X. Jiang, Y. Wang, “Video Quality Assessment Models for IPTV Services“, JDC
28、TA, April 2013. 11 Pierre Ferre, Dimitris Agrafiotis, Tuan Kiang Chiew, Angela Doufexi, Andrew Nix, David Bull, “Packet Loss Modelling for H.264 Video Transmission over IEEE 802.11g Wireless LANs“, IEEE WIAMIS 2005. 12 S. Holmer, M. Shemer, M. Paniconi, “Handling Packet Loss in WebRTC“, pp. 1860-186
29、4, ICIP, 2013. ETSI ETSI TR 126 922 V13.0.1 (2017-01)63GPP TR 26.922 version 13.0.1 Release 133 Definitions and abbreviations 3.1 Definitions For the purposes of the present document, the terms and definitions given in TR 21.905 1 apply. 3.2 Abbreviations For the purposes of the present document, th
30、e abbreviations given in TR 21.905 1 and the following apply. AV Audio Video AVC Advanced Video Coding AVPF Audio-Video Profile with Feedback ER Error Resiliency FPS Frames Per Second HEVC High Efficiency Video Coding IMS-VT IP Multimedia Subsystem Video Telephony KB Kilo Byte MTSI Multimedia Teleph
31、ony Service for IMS OTT Over The Top PLI Picture Loss Indication PLR Packet Loss Rate QVGA Quarter Video Graphics Array RPS Reference Picture Selection RPSI Reference Picture Selection Indication RTT Round Trip Time VGA Video Graphics Array VT Video Telephony VTRI_EXT Video Robustness Improvements E
32、xtensions Wifi Wireless Fidelity Note: Wifi is synonymous with Wi-Fi as defined by the Wi-Fi Allicance 4 Background The present document reports the study on video telephony robustness improvements extensions in Multimedia Telephony Service for IMS and provides recommendation on their applicability
33、for MTSI video telephony applications. These extensions target error robustness for higher bitrate MTSI video telephony as well as inter-working with WLAN use cases where error resiliency is more important. In order to be technically competitive, e.g. to some proprietary systems, MTSI should have th
34、e capability to employ mechanisms that can offer different trade-offs between rendering delay, video rendering jitter (smoothness) and video quality that can adapt to varying channel conditions for better user experience. Retransmission, Forward Error Correction (FEC), and complementary reference pi
35、cture selection indication (RPSI) AVPF feedback mechanisms offer these trade-offs. The present document first provides an overview of the additional error resiliency (ER) tools that could improve the performance of the Multimedia Telephony Service for IMS (TS 26.114 3). Then test conditions represen
36、tative of error conditions experienced in IMS Video Telephony are presented. Following the description of the test conditions, evaluation criteria for determining the benefits of proposed tools and mechanisms is presented. Performance of the proposed ER tools is evaluated under the defined testing c
37、onditions that take into account packet loss rate/pattern, end to end delay, bitrate overhead and video smoothness (dropped frames, rendering jitter). Based on the performance results, conclusions are made in terms of recommendations for support of proposed ER tools and mechanisms for Multimedia Tel
38、ephony Service for IMS. ETSI ETSI TR 126 922 V13.0.1 (2017-01)73GPP TR 26.922 version 13.0.1 Release 135 Overview of video robustness improvements extensions (VTRI_EXT) tools 5.1 Introduction Multimedia Telephony Service for IMS (MTSI 3GPP TS 26.114 3) defines MTSI clients“ sender and receiver behav
39、iour utilizing IETF RFC 4585 7 AVPF Generic NACK and Picture Loss Indication (PLI) feedback messages for ER. Current error correction scheme provides basic error correction through codec level error resiliency (ER) mechanisms. Transport and application level error resiliency schemes such as Retransm
40、ission (NACK), Forward Error Correction (FEC) along with advanced codec level ER schemes such as Reference Picture Selection (RPS) provide alternative error correction mechanisms that offer different performance trade-offs. The performance of error correction schemes varies with end-to-end delay, ch
41、annel bandwidth and packet loss rate. 5.2 Retransmission Retransmission (NACK) scheme 4 provides efficient error correction in terms of bandwidth under short round-trip-time (RTT) cases with low packet loss rates. The efficiency of retransmission scheme becomes more pronounced at higher bitrates sin
42、ce selective retransmission of lost packets instead of entire pictures are needed. Under low RTT scenarios it can provide low video rendering jitter dependent on the de-jittering mechanism at the cost of additional delay. If additional delay cannot be accommodated, then retransmission can still prov
43、ide recovery from error with video freezes during recovery similar to the existing error resiliency scheme in TS 26.114. 5.3 Forward error correction Forward Error Correction (FEC) schemes 5 and 6 provide a mechanism that balances video quality and end-to-end delay. FEC schemes can adapt to varying
44、channel error conditions. FEC is suitable for high RTT channels with high packet loss rates where retransmission leads to high video rendering delay and codec based recovery mechanisms like RPSI, PLI lead to frequent video freezes and/or corruptions. FEC schemes are complemented by retransmission (N
45、ACK) or RPSI, PLI feedback mechanisms to address FEC failure cases. 5.4 Reference picture selection Reference picture selection indication (RPSI) feedback message in AVPF 7 that is currently not supported in TS 26.114 offers establishment of common reference point for recovery between the sender and
46、 the receiver. In essence it provides codec level ER mechanism similar to the transport layer ER mechanism supported by the generic NACK message in TS 26.114. 6 Test cases and conditions 6.1 QoS requirements for conversational video services Specification TS 22.105 2 defines the range of QoS require
47、ments and end user QoS requirements for conversational video services. According to TS 22.105, the following requirements should be supported. ETSI ETSI TR 126 922 V13.0.1 (2017-01)83GPP TR 26.922 version 13.0.1 Release 13Table 6.1-1: Range of QoS requirements copied from TS 22.105 (clause 5.4) Real
48、 Time (Constant Delay) Non Real Time (Variable Delay) Operating environment BER/Max Transfer Delay BER/Max Transfer Delay Satellite (Terminal relative speed to ground up to 1000 km/h for plane) Max Transfer Delay less than 400 ms BER 10-3 - 10-7 (NOTE 1) Max Transfer Delay 1200 ms or more (NOTE 2) B
49、ER = 10-5 to 10-8 Rural outdoor (Terminal relative speed to ground up to 500 km/h) (NOTE 3) Max Transfer Delay 20 - 300 ms BER 10-3 - 10-7 (NOTE 1) Max Transfer Delay 150 ms or more (NOTE 2) BER = 10-5 to 10-8 Urban/ Suburban outdoor (Terminal relative speed to ground up to 120 km/h) Max Transfer Delay 20 - 300 ms BER 10-3 - 10-7 (NOTE 1) Max Transfer Delay 150 ms or more (Note 2) BER = 10-5 to 10-8 Indoor/ Low range outdoor (Terminal relative speed to ground up to 10 km/h) Max Transfer Delay 20 - 300 ms BER 10-3 - 10-7 (NOTE 1) Max
