1、 ETSI TR 126 938 V15.0.0 (2018-07) Universal Mobile Telecommunications System (UMTS); LTE; Packet-switched Streaming Service (PSS); Improved support for dynamic adaptive streaming over HTTP in 3GPP (3GPP TR 26.938 version 15.0.0 Release 15) TECHNICAL REPORT ETSI ETSI TR 126 938 V15.0.0 (2018-07)13GP
2、P TR 26.938 version 15.0.0 Release 15Reference RTR/TSGS-0426938vf00 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
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9、26 938 V15.0.0 (2018-07)23GPP TR 26.938 version 15.0.0 Release 15Intellectual Property Rights Essential patents IPRs essential or potentially essential to normative deliverables may have been declared to ETSI. The information pertaining to these essential IPRs, if any, is publicly available for ETSI
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13、emark and/or tradename. Mention of those trademarks in the present document does not constitute an endorsement by ETSI of products, services or organizations associated with those trademarks. Foreword This Technical Report (TR) has been produced by ETSI 3rd Generation Partnership Project (3GPP). The
14、 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 deliverables. The cross reference between GSM, UMTS, 3GPP and ETSI identities can be found unde
15、r 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 clause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of provisions). “m
16、ust“ and “must not“ are NOT allowed in ETSI deliverables except when used in direct citation. ETSI ETSI TR 126 938 V15.0.0 (2018-07)33GPP TR 26.938 version 15.0.0 Release 15Contents Intellectual Property Rights 2g3Foreword . 2g3Modal verbs terminology 2g3Foreword . 8g3Introduction 8g31 Scope 9g32 Re
17、ferences 9g33 Definitions and abbreviations . 10g33.1 Definitions 10g33.2 Abbreviations . 11g34 Relevant Specifications 12g34.1 Overview 12g34.2 3GP-DASH as a profile of MPEG-DASH . 12g34.2.1 General 12g34.2.2 Media Codecs . 13g34.2.3 Media Presentation Description constraints 13g34.2.4 Segment form
18、at constraints 13g34.2.5 Extensions . 13g34.2.5.1 Media Presentation Description Delta . 13g35 Deployment Guidelines 15g35.1 Introduction 15g35.2 Content Authoring Guidelines 15g35.3 Client implementation and client operation guidelines 15g35.3.1 Guidelines for rate adaptation . 15g35.3.1.1 Introduc
19、tion . 15g35.3.1.2 Rate adaptation in DASH 15g35.4 Operational and deployment guidelines . 16g35.4.1 General 16g35.4.2 Proxy/cache switch for DASH service 16g35.4.2.1 Assumptions 16g35.4.2.2 Description 16g35.4.2.3 Working assumption . 16g35.4.2.4 Recommended Requirements 16g36 General Use Cases 17g
20、36.1 Introduction 17g36.2 Advanced Support for Live Services 17g36.2.1 Description 17g36.2.1.1 Setup . 17g36.2.1.2 Use Case A: Start-up latency 17g36.2.1.3 Use Case B: Aligned Presentation 17g36.2.1.4 Use Case C: End-to-end latency 17g36.2.1.5 Use Case D: Time-Shift Buffer . 17g36.2.1.6 Use Case E:
21、Infrastructure Upgrade 17g36.2.1.7 Use Case F: Ad Insertion 17g36.2.2 Operation with MPD dynamic Mode 17g36.2.2.1 Introduction . 17g36.2.2.2 Problem Statement 18g36.2.2.3 Existing Technologies. 18g36.2.2.4 Consequences with Existing Technologies . 18g36.2.2.5 How does DASH solve this? . 19g36.2.2.5.
22、1 Overview . 19g36.2.2.5.2 Benefits of this approach . 19g3ETSI ETSI TR 126 938 V15.0.0 (2018-07)43GPP TR 26.938 version 15.0.0 Release 156.2.2.6 MPD Times . 20g36.2.2.7 General Derivation 20g36.2.2.8 Derivation of MPD Times . 21g36.2.2.9 Addressing Methods 21g36.2.2.9.1 Introduction . 21g36.2.2.9.2
23、 Playlist-Method . 21g36.2.2.9.3 Number-Based Template . 21g36.2.2.10 Scheduling Playout 21g36.2.2.11 Validity of MPD 22g36.2.3 Mapping Use Cases to Live Operation . 22g36.2.3.1 Use Case A 22g36.2.3.1.1 Description 22g36.2.3.1.2 MPD example 22g36.2.3.1.3 Client Procedure 22g36.2.3.2 Use Case B 22g36
24、.2.3.2.1 Description 22g36.2.3.2.2 MPD example 22g36.2.3.2.3 Client Procedure 23g36.2.3.3 Use Case C 23g36.2.3.3.1 Description 23g36.2.3.3.2 MPD example 23g36.2.3.3.3 Client Procedure 23g36.2.3.4 Use Case D 23g36.2.3.4.1 Description 23g36.2.3.4.2 MPD example 23g36.2.3.4.3 Client Procedure 23g36.2.3.
25、5 Use Case E 24g36.2.3.5.1 Description 24g36.2.3.5.2 MPD example 24g36.2.3.5.3 Client Procedure 24g36.2.3.6 Use Case F 24g36.2.3.6.1 Description 24g36.2.3.6.2 MPD example 24g36.2.3.6.3 Client Procedure 25g36.2.4 Gap Analysis. 25g36.2.5 Working Assumptions 25g36.3 Use Cases for Content Protection . 2
26、5g36.3.1 Use Case A Efficient Caching for Multiple DRM Systems . 25g36.3.1.1 Description 25g36.3.1.2 Actors issues . 26g36.3.1.3 Analysis in the Context of Rel-10 TS 26.247 . 26g36.3.2 Use Case B Signalling of Rights/License Acquisition Information in MPD . 26g36.3.2.1 Description 26g36.3.2.2 Actors
27、 issues: 26g36.3.2.3 Analysis in the Context of Rel-10 TS 26.247 . 27g36.3.3 Use Case C Time-Varying Decryption Keys . 27g36.3.3.1 Description 27g36.3.3.2 Actors issues: 27g36.3.3.3 Analysis in the Context of Rel-10 TS 26.247 2 28g36.4 Fast Media Start-up 28g36.4.1 Description 28g36.4.2 Analysis in
28、the Context of Rel-10 TS 26.247 . 28g36.5 Advanced Trick Modes 29g36.5.1 Description 29g36.5.2 Analysis in the Context of MPEG-DASH and Rel-10 TS 26.247 29g36.5.2.1 Overview . 29g36.5.2.2 Sub-Representations 29g36.5.2.3 MPD authoring 29g36.5.2.4 Segment generation . 29g36.5.2.5 Summary . 31g36.6 Con
29、tent and Device Interoperability. 31g36.6.1 Use Case Description 31g3ETSI ETSI TR 126 938 V15.0.0 (2018-07)53GPP TR 26.938 version 15.0.0 Release 156.6.2 Working Assumption 32g36.6.3 Gap Analysis . 32g36.7 Advanced Support for Live Services 32g36.7.1 Description 32g36.7.2 Working Assumption 32g36.7.
30、3 Gap Analysis . 32g36.8 Consistent QoE/QoS for DASH users 32g36.8.1 Description 32g36.8.2 Proposed Work . 33g36.8.3 Utilization of QoS Information in DASH . 33g36.9 DASH as download format 34g36.9.1 Description 34g36.10 Use Case: Use case description for Efficiency of HTTP-caching infrastructure on
31、 DASH . 36g36.10.1 Description 36g36.11 Use Case: Multiple Spectator Views offered with DASH 38g36.11.1 Description 38g36.11.2 Gap Analysis . 38g36.11.2.1 File support for timed position/location 38g36.11.2.2 MPD indication of position/orientation for a Representation or Segment 40g36.11.2.3 Synchro
32、nization of media content from different devices . 41g36.11.2.4 MPD indication of key highlights of the event . 41g36.11.2.5 MPD indication of capturing parameters 41g36.12 Use cases for operator control of video streaming services 41g36.12.1 Introduction. 41g36.12.2 Description 42g36.12.2.1 Operato
33、r control of video services 42g36.12.2.2 Operator control using mobile network subscription 42g36.12.2.3 Operator management of video streaming service over the radio network . 42g36.12.3 Working assumptions . 42g36.12.4 Conclusions and Gap Analysis . 42g36.13 Use Cases for DASH Operation with Netwo
34、rk Proxy Caches . 43g36.13.1 Introduction. 43g36.13.2 Use Case Description 43g36.13.2.1 Use Case 1: Fast Startup . 43g36.13.2.2 Use Case 2: Partial Representation Caching . 43g36.13.2.3 Use Case 3: Network mobility 44g36.13.2.4 Use Case 4: Mobility and Coverage Extension for MBMS-based service 44g36
35、.13.3 Solution Analysis: Usage of TS 26.247 44g36.13.3.1 MPD Update . 44g36.13.3.2 Redirections 45g36.13.3.3 Bandwidth Throttling 46g36.13.3.4 Control Events . 47g36.13.3 Gap Analysis and Problem Statement . 48g36.14 Services with caching of DASH content at UE functions 48g36.14.1 Use Case Descripti
36、on 48g36.14.1.1 Use case 1: HTTP Proxy Cache in UE for transparent reception of DASH content over unicast or broadcast . 48g36.14.1.2 Use case 2: HTTP Proxy Cache in a home GW (gateway), capable of serving multiple DASH players in the home . 49g36.14.1.3 Use case 3: Pre-Caching on UE 49g36.14.2 Work
37、ing assumptions . 49g36.14.3 Gap Analysis . 50g36.14.4 Recommended Requirements . 50g36.15 Handling special content 50g36.15.1 Description 50g36.15.1.1 Enabling users to skip some repetitive/low importance content . 50g36.15.1.2 Preventing users from skipping special content 50g36.15.1.3 Network/Con
38、tent provider control of special content . 51g36.15.2 Working assumptions . 51g36.15.3 Analysis against TS 26.247: Dynamic Services . 51g36.15.3.1 General 51g36.15.3.2 Tools and Evidence . 51g3ETSI ETSI TR 126 938 V15.0.0 (2018-07)63GPP TR 26.938 version 15.0.0 Release 156.15.3.3 Just-in-Time Conten
39、t Insertion 52g36.15.3.4 Client Behaviour . 52g36.15.3.5 More complex rules. 52g36.15.3.6 Addressing the Use Cases . 52g36.15.3.6.1 Repetitive Content . 52g36.15.3.6.2 Forced Play-out . 53g36.15.3.6.3 Flexible Ad Insertion . 54g36.15.3.4 Gap Analysis and Recommendations . 55g36.16 Use Cases on DASH
40、Authentication 56g36.16.1 Use Case 1 56g36.16.2 Use Case 2 56g36.16.3 Use Case 3 56g36.16.4 Use Case 4 56g36.16.5 Use Case 5 57g36.16.6 Gap Analysis on the Use Cases 57g36.16.6.1 Analysis of Use Cases 1-3 on content access authorization 57g36.16.6.2 Analysis of Use Cases 4-5 on application-level con
41、tent/metadata integrity validation: . 57g36.17 Consistent Quality for DASH users 57g36.17.1 Use Case Description 57g36.17.2 Gap Analysis . 57g36.17.3 Overview of Potential Solution Space 59g36.17.4 Additional Simulation Results on DASH over GBR and Non-GBR bearers 59g37 Advertisement Insertion Use C
42、ases 62g37.1 Introduction 62g37.2 Use Cases . 62g37.2.1 Use Case 1: Fixed duration advertisement in On-Demand Content . 62g37.2.2 Use Case 2: Variable duration advertisement in On-Demand Content . 62g37.2.3 Use Case 3: Trusted Client Playback 62g37.2.4 Use Case 4: Advertisement in Live Content . 62g
43、37.2.5 Use Case 5: Accessing Live Content 63g37.3 Working Assumptions 63g37.3.1 Introduction. 63g37.3.2 Generic assumptions . 63g37.3.3 Single Media Presentation 64g37.3.4 Presentation Layer controlled Ad Insertion 64g37.4 Analysis in the Context of TS 26.247. 64g37.4.1 Single Media Presentation 64g
44、37.4.2 Presentation Layer controlled Ad Insertion Analysis . 69g37.4 Examples 70g37.4.1 Fixed Duration in On-Demand . 70g37.4.2 Targeted Advertisements 71g37.4.3 Example call for Ad insertion for DASH 73g37.6 Advanced Advertisement insertion in the operator network 73g37.6.1 Description 73g37.6.1.1
45、Advertisement insertion based on user subscription . 73g37.6.1.2 Targeted advertisement insertion 73g37.6.1.3 Bandwidth-related advertisement/message . 74g37.6.2 Working assumptions . 74g37.6.3 Solution based on TS 26.247 and Gap Analysis . 74g38 Conclusions and Recommendations . 74g3Annex A: Detail
46、ed Performance Evaluation Results on Quality-Driven Rate Adaptation Algorithms . 77g3A.1 Introduction 77g3A.2 Simulation Setup 77g3A.3 Content Preparation 78g3A.4 DASH Rate Adaptation Algorithms . 80g3A.4.1 Adaptation based on per-segment bitrate information (Non-Quality): . 80g3A.4.2 Adaptation bas
47、ed on per-segment bitrate and quality information (Quality-based) . 81g3ETSI ETSI TR 126 938 V15.0.0 (2018-07)73GPP TR 26.938 version 15.0.0 Release 15A.4.3 Bandwidth Model . 82g3A.4.4 Experimental Results 83g3Annex B: Evaluation of QoS-Driven DASH Client Adaptation 86g3Annex C: Change history 96g3H
48、istory 97g3ETSI ETSI TR 126 938 V15.0.0 (2018-07)83GPP TR 26.938 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 subject to continuing work within the TSG and may change following form
49、al 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 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 editorial only changes have been incor
