1、 ETSI TR 1Universal Mobile TelPacket-switchImproved supportov(3GPP TR 26.9TECHNICAL REPORT 126 938 V13.0.0 (2016elecommunications System (LTE; ched Streaming Service (PSS)rt for dynamic adaptive streaover HTTP in 3GPP .938 version 13.0.0 Release 1316-01) (UMTS); S); eaming 13) ETSI ETSI TR 126 938 V
2、13.0.0 (2016-01)13GPP TR 26.938 version 13.0.0 Release 13Reference RTR/TSGS-0426938vd00 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 l
3、a Sous-Prfecture de Grasse (06) N 7803/88 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 s
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9、6 938 V13.0.0 (2016-01)23GPP TR 26.938 version 13.0.0 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-memb
10、ers, and can be found in 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
11、 to the ETSI IPR Policy, 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 documen
12、t. Foreword This Technical 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 cor
13、responding ETSI deliverables. 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 “shall“, “shall not“, “should“, “should not“, “may“, “need not“, “will“, “will not“, “can“ and “ca
14、nnot“ 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 allowed in ETSI deliverables except when used in direct citation. ETSI ETSI TR 126 938 V13.0.0 (2016-01)33GPP TR 26.938 version 13.0.0 Rele
15、ase 13Contents Intellectual Property Rights 2g3Foreword . 2g3Modal verbs terminology 2g3Foreword . 8g3Introduction 8g31 Scope 9g32 References 9g33 Definitions and abbreviations . 10g33.1 Definitions 10g33.2 Abbreviations . 11g34 Relevant Specifications 12g34.1 Overview 12g34.2 3GP-DASH as a profile
16、of MPEG-DASH . 13g34.2.1 General 13g34.2.2 Media Codecs . 13g34.2.3 Media Presentation Description constraints 13g34.2.4 Segment format constraints 13g34.2.5 Extensions . 14g34.2.5.1 Media Presentation Description Delta . 14g35 Deployment Guidelines 15g35.1 Introduction 15g35.2 Content Authoring Gui
17、delines 15g35.3 Client implementation and client operation guidelines 15g35.3.1 Guidelines for rate adaptation . 15g35.3.1.1 Introduction . 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 17g35.4.2.1
18、Assumptions 17g35.4.2.2 Description 17g35.4.2.3 Working assumption . 17g35.4.2.4 Recommended Requirements 17g36 General Use Cases 17g36.1 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:
19、 Aligned Presentation 17g36.2.1.4 Use Case C: End-to-end latency 18g36.2.1.5 Use Case D: Time-Shift Buffer . 18g36.2.1.6 Use Case E: Infrastructure Upgrade 18g36.2.1.7 Use Case F: Ad Insertion 18g36.2.2 Operation with MPD dynamic Mode 18g36.2.2.1 Introduction . 18g36.2.2.2 Problem Statement 18g36.2.
20、2.3 Existing Technologies. 18g36.2.2.4 Consequences with Existing Technologies . 19g36.2.2.5 How does DASH solve this? . 19g36.2.2.5.1 Overview . 19g3ETSI ETSI TR 126 938 V13.0.0 (2016-01)43GPP TR 26.938 version 13.0.0 Release 136.2.2.5.2 Benefits of this approach . 19g36.2.2.6 MPD Times . 20g36.2.2
21、.7 General Derivation 21g36.2.2.8 Derivation of MPD Times . 21g36.2.2.9 Addressing Methods 21g36.2.2.9.1 Introduction . 21g36.2.2.9.2 Playlist-Method . 21g36.2.2.9.3 Number-Based Template . 22g36.2.2.10 Scheduling Playout 22g36.2.2.11 Validity of MPD 22g36.2.3 Mapping Use Cases to Live Operation . 2
22、2g36.2.3.1 Use Case A 22g36.2.3.1.1 Description 22g36.2.3.1.2 MPD example 22g36.2.3.1.3 Client Procedure 23g36.2.3.2 Use Case B 23g36.2.3.2.1 Description 23g36.2.3.2.2 MPD example 23g36.2.3.2.3 Client Procedure 23g36.2.3.3 Use Case C 23g36.2.3.3.1 Description 23g36.2.3.3.2 MPD example 24g36.2.3.3.3
23、Client Procedure 24g36.2.3.4 Use Case D 24g36.2.3.4.1 Description 24g36.2.3.4.2 MPD example 24g36.2.3.4.3 Client Procedure 24g36.2.3.5 Use Case E 24g36.2.3.5.1 Description 24g36.2.3.5.2 MPD example 24g36.2.3.5.3 Client Procedure 25g36.2.3.6 Use Case F 25g36.2.3.6.1 Description 25g36.2.3.6.2 MPD exam
24、ple 25g36.2.3.6.3 Client Procedure 26g36.2.4 Gap Analysis. 26g36.2.5 Working Assumptions 26g36.3 Use Cases for Content Protection . 26g36.3.1 Use Case A Efficient Caching for Multiple DRM Systems . 26g36.3.1.1 Description 26g36.3.1.2 Actors issues . 26g36.3.1.3 Analysis in the Context of Rel-10 TS 2
25、6.247 . 27g36.3.2 Use Case B Signalling of Rights/License Acquisition Information in MPD . 27g36.3.2.1 Description 27g36.3.2.2 Actors issues: 27g36.3.2.3 Analysis in the Context of Rel-10 TS 26.247 . 27g36.3.3 Use Case C Time-Varying Decryption Keys . 28g36.3.3.1 Description 28g36.3.3.2 Actors issue
26、s: 28g36.3.3.3 Analysis in the Context of Rel-10 TS 26.247 2 29g36.4 Fast Media Start-up 29g36.4.1 Description 29g36.4.2 Analysis in the Context of Rel-10 TS 26.247 . 29g36.5 Advanced Trick Modes 29g36.5.1 Description 29g36.5.2 Analysis in the Context of MPEG-DASH and Rel-10 TS 26.247 30g36.5.2.1 Ov
27、erview . 30g36.5.2.2 Sub-Representations 30g36.5.2.3 MPD authoring 30g36.5.2.4 Segment generation . 30g36.5.2.5 Summary . 32g36.6 Content and Device Interoperability. 32g3ETSI ETSI TR 126 938 V13.0.0 (2016-01)53GPP TR 26.938 version 13.0.0 Release 136.6.1 Use Case Description 32g36.6.2 Working Assum
28、ption 33g36.6.3 Gap Analysis . 33g36.7 Advanced Support for Live Services 33g36.7.1 Description 33g36.7.2 Working Assumption 33g36.7.3 Gap Analysis . 33g36.8 Consistent QoE/QoS for DASH users 34g36.8.1 Description 34g36.8.2 Proposed Work . 34g36.8.3 Utilization of QoS Information in DASH . 34g36.9 D
29、ASH as download format 36g36.9.1 Description 36g36.10 Use Case: Use case description for Efficiency of HTTP-caching infrastructure on DASH . 38g36.10.1 Description 38g36.11 Use Case: Multiple Spectator Views offered with DASH 40g36.11.1 Description 40g36.11.2 Gap Analysis . 40g36.11.2.1 File support
30、 for timed position/location 40g36.11.2.2 MPD indication of position/orientation for a Representation or Segment 42g36.11.2.3 Synchronization of media content from different devices . 43g36.11.2.4 MPD indication of key highlights of the event . 43g36.11.2.5 MPD indication of capturing parameters 43g
31、36.12 Use cases for operator control of video streaming services 44g36.12.1 Introduction. 44g36.12.2 Description 44g36.12.2.1 Operator control of video services 44g36.12.2.2 Operator control using mobile network subscription 44g36.12.2.3 Operator management of video streaming service over the radio
32、network . 44g36.12.3 Working assumptions . 44g36.12.4 Conclusions and Gap Analysis 45g36.13 Use Cases for DASH Operation with Network Proxy Caches . 45g36.13.1 Introduction. 45g36.13.2 Use Case Description 45g36.13.2.1 Use Case 1: Fast Startup . 45g36.13.2.2 Use Case 2: Partial Representation Cachin
33、g . 46g36.13.2.3 Use Case 3: Network mobility 46g36.13.2.4 Use Case 4: Mobility and Coverage Extension for MBMS-based service 46g36.13.3 Solution Analysis: Usage of TS 26.247 46g36.13.3.1 MPD Update . 46g36.13.3.2 Redirections 47g36.13.3.3 Bandwidth Throttling 48g36.13.3.4 Control Events . 49g36.13.
34、3 Gap Analysis and Problem Statement . 50g36.14 Services with caching of DASH content at UE functions 51g36.14.1 Use Case Description 51g36.14.1.1 Use case 1: HTTP Proxy Cache in UE for transparent reception of DASH content over unicast or broadcast . 51g36.14.1.2 Use case 2: HTTP Proxy Cache in a h
35、ome GW (gateway), capable of serving multiple DASH players in the home . 51g36.14.1.3 Use case 3: Pre-Caching on UE 51g36.14.2 Working assumptions . 52g36.14.3 Gap Analysis . 52g36.14.4 Recommended Requirements . 52g36.15 Handling special content 53g36.15.1 Description 53g36.15.1.1 Enabling users to
36、 skip some repetitive/low importance content . 53g36.15.1.2 Preventing users from skipping special content 53g36.15.1.3 Network/Content provider control of special content . 53g36.15.2 Working assumptions . 53g36.15.3 Analysis against TS 26.247: Dynamic Services . 53g36.15.3.1 General 53g3ETSI ETSI
37、TR 126 938 V13.0.0 (2016-01)63GPP TR 26.938 version 13.0.0 Release 136.15.3.2 Tools and Evidence . 54g36.15.3.3 Just-in-Time Content Insertion 54g36.15.3.4 Client Behaviour . 55g36.15.3.5 More complex rules. 55g36.15.3.6 Addressing the Use Cases . 55g36.15.3.6.1 Repetitive Content . 55g36.15.3.6.2 F
38、orced Play-out . 55g36.15.3.6.3 Flexible Ad Insertion . 56g36.15.3.4 Gap Analysis and Recommendations . 58g36.16 Use Cases on DASH Authentication 58g36.16.1 Use Case 1 58g36.16.2 Use Case 2 58g36.16.3 Use Case 3 59g36.16.4 Use Case 4 59g36.16.5 Use Case 5 59g36.16.6 Gap Analysis on the Use Cases 59g
39、36.16.6.1 Analysis of Use Cases 1-3 on content access authorization 59g36.16.6.2 Analysis of Use Cases 4-5 on application-level content/metadata integrity validation: . 60g36.17 Consistent Quality for DASH users 60g36.17.1 Use Case Description 60g36.17.2 Gap Analysis . 60g36.17.3 Overview of Potenti
40、al Solution Space 61g36.17.4 Additional Simulation Results on DASH over GBR and Non-GBR bearers 62g37 Advertisement Insertion Use Cases 64g37.1 Introduction 64g37.2 Use Cases . 64g37.2.1 Use Case 1: Fixed duration advertisement in On-Demand Content . 64g37.2.2 Use Case 2: Variable duration advertise
41、ment in On-Demand Content . 65g37.2.3 Use Case 3: Trusted Client Playback 65g37.2.4 Use Case 4: Advertisement in Live Content . 65g37.2.5 Use Case 5: Accessing Live Content 65g37.3 Working Assumptions 65g37.3.1 Introduction. 65g37.3.2 Generic assumptions . 65g37.3.3 Single Media Presentation 66g37.3
42、.4 Presentation Layer controlled Ad Insertion . 66g37.4 Analysis in the Context of TS 26.247. 66g37.4.1 Single Media Presentation 66g37.4.2 Presentation Layer controlled Ad Insertion Analysis . 71g37.4 Examples 73g37.4.1 Fixed Duration in On-Demand . 73g37.4.2 Targeted Advertisements 73g37.4.3 Examp
43、le call for Ad insertion for DASH 75g37.6 Advanced Advertisement insertion in the operator network 76g37.6.1 Description 76g37.6.1.1 Advertisement insertion based on user subscription . 76g37.6.1.2 Targeted advertisement insertion 76g37.6.1.3 Bandwidth-related advertisement/message . 76g37.6.2 Worki
44、ng assumptions . 76g37.6.3 Solution based on TS 26.247 and Gap Analysis . 76g38 Conclusions and Recommendations . 77g3Annex A: Detailed Performance Evaluation Results on Quality-Driven Rate Adaptation Algorithms . 79g3A.1 Introduction 79g3A.2 Simulation Setup 79g3A.3 Content Preparation 80g3A.4 DASH
45、 Rate Adaptation Algorithms . 82g3A.4.1 Adaptation based on per-segment bitrate information (Non-Quality): . 82g3ETSI ETSI TR 126 938 V13.0.0 (2016-01)73GPP TR 26.938 version 13.0.0 Release 13A.4.2 Adaptation based on per-segment bitrate and quality information (Quality-based) . 83g3A.4.3 Bandwidth
46、Model . 84g3A.4.4 Experimental Results 85g3Annex B: Evaluation of QoS-Driven DASH Client Adaptation 88g3Annex C: Change history 98g3History 99g3ETSI ETSI TR 126 938 V13.0.0 (2016-01)83GPP TR 26.938 version 13.0.0 Release 13Foreword This Technical Report has been produced by the 3rdGeneration Partner
47、ship 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 and an increa
48、se 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
49、, corrections, updates, etc. z the third digit is incremented when editorial only changes have been incorporated in the document. Introduction 3GPPs Dynamic Adaptive Streaming over HTTP (DASH) specifications were developed in Rel-9 and Rel-10 and are available in TS 26.247 2. Despite being integrated into the PSS architecture, the specifications have significant flexibility for deployments also outside the 3GPP services. This has been recognized by other organizations such as MPEG and Open IPTV Forum. In continuous alignment efforts, 3GPP and MPEG have developed
