1、 ETSI TR 126 989 V15.0.0 (2018-07) LTE; Mission Critical Push To Talk (MCPTT); Media, codecs and Multimedia Broadcast/Multicast Service (MBMS) enhancements for MCPTT over LTE (3GPP TR 26.989 version 15.0.0 Release 15) TECHNICAL REPORT ETSI ETSI TR 126 989 V15.0.0 (2018-07)13GPP TR 26.989 version 15.
2、0.0 Release 15Reference RTR/TSGS-0426989vf00 Keywords LTE 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 7803/88 Import
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15、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 clause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of provisions). “must“ and “must not“ are NOT
16、allowed in ETSI deliverables except when used in direct citation. ETSI ETSI TR 126 989 V15.0.0 (2018-07)33GPP TR 26.989 version 15.0.0 Release 15Contents Intellectual Property Rights 2g3Foreword . 2g3Modal verbs terminology 2g3Foreword . 5g31 Scope 6g32 References 6g33 Abbreviations . 7g34 Reference
17、 Model 7g35 Key Issues for Supporting MCPTT 8g35.1 Key Issue#1: Codec for MCPTT 8g35.1.1 Review of Codec Alternatives and their Relative Perceptual Performance 8 g35.1.1.1 Overview of the 3GPP Codec Comparison . 8g35.1.1.2 Narrowband Comparison vs AMR 8g35.1.1.3 Wideband Comparison vs AMR-WB . 12g35
18、.1.1.4 Super-wideband EVS and Relationships to Other Bandwidths . 16g35.1.1.5 Comparison of the 3GPP Codecs to TETRA 17g35.1.1.6 Comparison of Performance over MCPTT Bearers 19g35.1.1.6.1 “HD-Voice“ AMR-WB performance over 3GPP networks 19g35.1.1.6.2 MCPTT Bearers. 21g35.1.1.6.3 AMR-WB and EVS Perfo
19、rmance over the MCPTT Bearers 23g35.1.1.6.3.1 EVS Speech Quality 23g35.1.1.6.3.2 Unicast bearer 28g35.1.1.6.3.3 MBMS bearer 28g35.1.1.6.3.4 LTE-D bearer . 31g35.1.1.6.4 Conclusions . 37g35.1.1.7 Listening effort evaluation of AMR-WB and EVS under impaired channels . 38g35.1.1.7.1 Test setup . 38g35.
20、1.1.7.2 Test results . 38g35.1.2 Review of the Codec Alternatives and their Relative Speech Intelligibility in Clean and Low SNRs . 41g35.1.2.1 Speech Intelligibility . 41g35.1.2.1.1 MCPTT bearers speech intelligibility . 48g35.1.2.1.2 Conclusions . 53g35.1.3 Review of Codec Alternatives and their R
21、elative Complexity . 54g35.1.4 Recommended requirements . 55g35.1.5 GAP Analysis and Evaluation 56g35.1.5.1 Requirements on Audio/Voice Quality . 56g35.1.5.2 Discrete/Ambient Listening and Remotely Initiated Monitoring 56g35.1.5.3 Noise Reduction 56g35.1.5.4 Common Codec Constraints of MCPTT . 56g35
22、.1.5.5 Requirements on Transcoding Functions in the Network . 57g35.1.6 Criteria with respect to MCPTT codec selection 58g35.1.7 Solution . 58g35.2 Key Issue#2: User Experience 59g35.2.1 Description 59g35.2.2 Recommended requirements . 59g35.2.3 GAP Analysis and Evaluation 59g35.2.3.1 Longer e2e del
23、ay over BC bearer issue . 59g35.2.3.2 Mobility issue 60g35.2.3.2.1 BC handoff to UC 60g35.2.3.2.2 UC handoff to BC 61g35.2.4 Assumptions . 61g35.2.5 Solution . 61g35.2.5.1 Transport delay difference adjustment 61g35.2.5.2 RTP payload treatment 61g3ETSI ETSI TR 126 989 V15.0.0 (2018-07)43GPP TR 26.98
24、9 version 15.0.0 Release 155.3 Key Issue#3: MCPTT over MBMS support . 62g35.3.1 Description 62g35.3.2 Deployment Considerations 64g35.3.3 Realization (Stage 3) Considerations (On-Network) 64g35.3.4 Media Handling 64g35.3.5 QoE for MCPTT over MBMS 65g35.3.5.1 QoE for both MNO and MCPTT service provid
25、er 65g35.3.6 eNB Scheduling on the MBMS Bearer . 65g35.3.7 Needed information to describe an MCPTT User Plane . 65g36 Conclusion 65g3Annex A: Simulation Models and Parameters 67g3A.1 MBMS Bearer Simulation Model 67g3A.1.1 Coverage. 67g3A.1.2 Error Traces 68g3A.1.3 eNB Scheduling 71g3A.2 Correlation
26、between Subjective MOS and P.OLQA 72g3Annex B: Change history 73g3History 74g3ETSI ETSI TR 126 989 V15.0.0 (2018-07)53GPP TR 26.989 version 15.0.0 Release 15Foreword This Technical Report has been produced by the 3rdGeneration Partnership Project (3GPP). The contents of the present document are subj
27、ect 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 and an increase in version number as follows: Version x.y.z where: x the first
28、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. technical enhancements, corrections, updates, etc. z the third digit is incremented when
29、 editorial only changes have been incorporated in the document. ETSI ETSI TR 126 989 V15.0.0 (2018-07)63GPP TR 26.989 version 15.0.0 Release 151 Scope The present document covers the enhancement required to support MCPTT. 2 References The following documents contain provisions which, through referen
30、ce in this text, constitute provisions of the present document. - 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 versio
31、n applies. In the case of a reference to a 3GPP document (including 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 22.179: “Mission Criti
32、cal Push To Talk (MCPTT) over LTE; Stage 1“ 3 3GPP TR 26.952: “Codec for Enhanced Voice Services (EVS);Performance Characterization“. 4 3GPP TS 26.114: “IP Multimedia Subsystem (IMS); Multimedia Telephony; Media handling and interaction“. 5 ITU-T Technical Paper - GSTP-GVBR, Performance of ITU-T G.7
33、18 (http:/www.itu.int/pub/T-TUT) (http:/www.itu.int/pub/publications.aspx-lang=en Protocols and codecs“. 12 3GPP TS 23.468: “Group Communication System Enablers for LTE (GCSE_LTE); Stage 2“. 13 3GPP TR 26 976: “Performance characterization of the Adaptive Multi-Rate Wideband (AMR-WB) speech codec“.
34、14 3GPP TS 22.076: “Noise suppression for the AMR codec; Service description; Stage 1“. 15 3GPP TS 26.131: “Terminal acoustic characteristics for telephony; Requirements“. 16 NTIA Report 15-520: “Speech Codec Intelligibility Testing in Support of Mission-Critical Voice Applications for LTE“, S.D. Vo
35、ran Overall description; Stage 2“. ETSI ETSI TR 126 989 V15.0.0 (2018-07)73GPP TR 26.989 version 15.0.0 Release 1520 3GPP TR 26.947: “Multimedia Broadcast/Multicast Service (MBMS); Selection and characterisation of application layer Forward Error Correction (FEC)“. 21 (void) 22 (void) 23 (void) 24 I
36、TU-T Recommendation P.800 (08/1996): “Methods for subjective determination of transmission quality“. 25 3GPP TS 26.442: “Codec for Enhanced Voice Services (EVS); ANSI C code (fixed-point)“. 26 3GPP TS 26.448: “Codec for Enhanced Voice Services (EVS); Jitter buffer management“. 27 ITU-T Recommendatio
37、n P.807 (02/2016): “Subjective test methodology for assessing speech intelligibility“. 3 Abbreviations For the purposes of the present document, the abbreviations given in 3GPP TR 21.905 1 and the following apply. An abbreviation defined in the present document takes precedence over the definition o
38、f the same abbreviation, if any, in 3GPP TR 21.905 1. ADP Associated Delivery Procedures AS Application Server BC BroadcastBM-SC Broadcast-Multicast - Service Centre GCS Group Communication Service MCPTT Mission Critical Push-To-Talk MBMS Multimedia Broadcast/Multicast Service MBSFN Multimedia Broad
39、cast Single Frequency Network MOS Mean Opinion Score NTIA National Telecommunications both randomly distributed or according to the Delay and Error profiles from TS 26.114 4 using the EVS JBM. ETSI ETSI TR 126 989 V15.0.0 (2018-07)93GPP TR 26.989 version 15.0.0 Release 15(a) (b) (c) (d) Figure 2: EV
40、S NB vs AMR Speech - Random Frame Erasures - Selection ETSI ETSI TR 126 989 V15.0.0 (2018-07)103GPP TR 26.989 version 15.0.0 Release 15(a) (b) (c) (d) Figure 3: EVS NB vs AMR Speech - Random Frame Erasures - Characterization ETSI ETSI TR 126 989 V15.0.0 (2018-07)113GPP TR 26.989 version 15.0.0 Relea
41、se 15(a) (b) Figure 4: EVS NB vs AMR Speech - TS 26.114 Delay focused on determining the performance of the EVS Wideband Primary Modes of operation. Taken together these experiments provide unique information about the performance of EVS with respect to AMR-WB but the highlights are provided below i
42、n Figures 7 to 10. As in the case of AMR and NB, it can be seen that EVS always significantly out-performs AMR-WB or AMR-WB/G.718IO in terms of intrinsic audio quality for both speech and Mixed/Music signals. EVS is also significantly more robust to input level and frame erasures; both randomly dist
43、ributed or using the EVS JBM in conjunction with the packet delay and error profiles taken from either TS 26.114 or the new profiles defined for LTE. What is less clear from the frame erasure plots is that AMR-WB, in its basic form, performs significantly less well than these curves would suggest. W
44、ork in ITU-T as part of the G.718 exercise led to significant improvements to the packet loss concealment of AMR-WB (G.722.2) and these improvements are shown in Figures 11 taken from the Characterization Report of Recommendation ITU-T G.718 5. The enhancements achieved during the development of G.7
45、18 formed part of the justification of the EVS work item and thus it can be assumed that EVS will perform even better than suggested by Figures 8, 9 and 10. ETSI ETSI TR 126 989 V15.0.0 (2018-07)133GPP TR 26.989 version 15.0.0 Release 15(a) (b) Figure 7: EVS WB vs AMR-WB Speech Clean Channel WB and
46、NB. These mixed bandwidth test results also reinforce the performance advantages of EVS compared to AMR and AMR-WB. ETSI ETSI TR 126 989 V15.0.0 (2018-07)173GPP TR 26.989 version 15.0.0 Release 15(a) Clean (b) Car Noise (c) Music firstly the Enhanced Full-Rate Codec (EFR), then the Adaptive Multi-Ra
47、te codec (AMR) which included the EFR as the 12.2 kbps mode and most recently the EVS codec. Each of these developments has provided clear and measurable quality improvements over the generation that went before. Figure 14: (Figure 5.4 from 7): AMR Family of Curves for Experiment 1b (Clean Speech in
48、 Half Rate) ETSI ETSI TR 126 989 V15.0.0 (2018-07)193GPP TR 26.989 version 15.0.0 Release 15Examining the performance gains of GSM EFR (= AMR 12.2 - ETSI ETR 305 or GSM 06.55 8) over the GSM Full Rate Codec it is clear that EFR significantly outperformed the GSM Full Rate Codec in all tests 8: “The
49、EFR codec is better than the actual FR codec for clear speech, for all error conditions (EP1, EP2 andEP3) and for tandeming under error EP1; it is equivalent to G.728 for its intrinsic quality, for background noise conditions and talker dependency.“ Considering GSM AMR (ETSI TR 126 975 7), from Figure 14 (Figure 5.4 of 7) it can be seen that all of the AMR coding modes are at least as good as the GSM Full Rate Codec for clean speech 7. Data is somewhat lacking on noisy speech performance with AMR in 7 but
