ETSI TS 126 247 V19.1.0 (2026-03)

Universal Mobile Telecommunications System (UMTS); LTE; Transparent end-to-end Packet-switched Streaming Service (PSS); Progressive Download and Dynamic Adaptive Streaming over HTTP (3GP-DASH) (3GPP TS 26.247 version 19.1.0 Release 19)

RTS/TSGS-0426247vj10

General Information

• Status: Not Published
• Technical Committee: 3GPP SA 4 - Codec
• Current Stage: 8 - Draft receipt by ETSI Secretariat
• Completion Date: 13-Mar-2026

Standards Content (Sample)

TECHNICAL SPECIFICATION
Universal Mobile Telecommunications System (UMTS);
LTE;
Transparent end-to-end
Packet-switched Streaming Service (PSS);
Progressive Download and Dynamic Adaptive Streaming over
HTTP (3GP-DASH)
(3GPP TS 26.247 version 19.1.0 Release 19)


3GPP TS 26.247 version 19.1.0 Release 19 1 ETSI TS 126 247 V19.1.0 (2026-03)

Reference
RTS/TSGS-0426247vj10
Keywords
LTE,UMTS
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ETSI
3GPP TS 26.247 version 19.1.0 Release 19 2 ETSI TS 126 247 V19.1.0 (2026-03)
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ETSI
3GPP TS 26.247 version 19.1.0 Release 19 3 ETSI TS 126 247 V19.1.0 (2026-03)
Contents
Intellectual Property Rights . 2
Legal Notice . 2
Modal verbs terminology . 2
Foreword . 9
Introduction . 9
1 Scope . 10
2 References . 10
3 Definitions and abbreviations . 13
3.1 Definitions . 13
3.2 Abbreviations . 13
3.3 Conventions . 14
4 Overview . 14
5 System description . 15
5.1 Overview . 15
5.2 Service access . 16
5.3 Protocols . 16
5.3.1 General . 16
5.3.2 Partial file handling . 17
6 Progressive Download over HTTP . 17
6.1 General . 17
6.2 Progressive Download . 17
6.3 3GPP file format profiles . 17
7 3GPP Dynamic Adaptive Streaming over HTTP . 18
7.1 System description . 18
7.2 3GP-DASH client model . 19
7.3 3GP-DASH profiles . 19
7.3.1 General . 19
7.3.2 3GPP Adaptive HTTP Streaming (Release-9 AHS) . 19
7.3.3 3GP-DASH Release-10 Profile. 19
7.3.3.1 Introduction . 19
7.3.4 3GP-DASH Release 11 multiview stereoscopic 3D video profile . 20
7.3.5 3GP-DASH Release 11 frame-packed stereoscopic 3D video profile . 20
7.3.6 Media codecs . 20
7.3.7 Content protection . 21
7.3.8 Partial file handling . 21
7.3.9 3GP-DASH enhanced interoperability point . 21
7.3.10 DASH in TeleVision (TV) over 3GPP services . 22
7.3.11 5G Media Streaming DASH interoperability point . 22
8 DASH: media presentation . 23
8.1 Introduction . 23
8.2 Media Presentation Description . 24
8.2.1 General . 24
8.2.2 Schema and 3GPP extension . 24
8.2.3 Void . 25
8.2.4 Void . 25
8.3 MPD assembly . 25
8.4 Hierarchical data model . 25
8.4.1 General . 25
8.4.2 Period . 26
8.4.2.1 General . 26
8.4.2.2 Content offering with multiple Periods . 27
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8.4.3 Adaptation Sets and Representations . 28
8.4.3.1 Overview . 28
8.4.3.2 Common attributes and elements . 28
8.4.3.3 Adaptation Set . 29
8.4.3.4 Representation . 30
8.4.3.5 Sub-representation. 30
8.4.3.6 Content Component . 31
8.4.4 Segments and Segment Information . 31
8.5 MPD update. 32
8.5.1 General . 32
8.5.2 Media Presentation Description delta . 32
8.6 Additional Media Presentation Information . 33
8.6.1 Introduction. 33
8.6.2 Program Information. 33
8.6.3 Descriptors . 34
8.7 Base URL processing . 34
8.8 Event Streams . 34
9 DASH: usage of 3GPP file format . 35
9.1 Introduction . 35
9.2 Segment types and formats . 35
9.2.1 Introduction. 35
9.2.2 Initialization Segment . 35
9.2.3 Media Segment . 36
9.2.3.1 General . 36
9.2.3.2 Subsegments and Segment Index . 36
9.2.3.3 Subsegment Index . 36
9.2.3.4 3GP-DASH Media Segment format . 36
9.2.4 Self-initializing Media Segment . 36
9.2.5 Media Stream and Segment properties . 36
9.2.5.1 Media Stream Access Points . 36
9.2.5.2 Non-overlapping Segments and Subsegments . 36
9.2.5.3 Bitstream concatenation . 36
9.3 Usage on server and client . 37
9.4 Segment properties with MPD constraints . 37
9.4.1 General . 37
9.4.1.1 Introduction . 37
9.4.1.2 Media Presentation timeline . 37
9.4.1.3 Segment Index . 37
9.4.2 Segment alignment . 37
9.4.3 Bitstream switching . 37
9.4.4 Sub-representation . 37
10 QoE for Progressive Download and DASH . 38
10.1 General . 38
10.2 QoE metric definitions . 38
10.2.1 Introduction. 38
10.2.2 Void . 38
10.2.3 Representation switch events . 39
10.2.4 Average throughput . 39
10.2.5 Initial playout delay . 39
10.2.6 Buffer level . 40
10.2.7 Playlist . 40
10.2.8 MPD information . 42
10.2.9 Playout delay for media start-up . 43
10.2.10 Device information . 43
10.3 Quality metrics for Progressive Download . 44
10.4 Quality metrics for DASH . 44
10.5 Quality reporting scheme for DASH . 46
10.6 Quality reporting protocol . 48
10.6.1 General . 48
10.6.2 Report format . 48
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10.6.3 Reporting protocols. 53
11 Live services . 55
11.1 Overview of dynamic and live media presentations . 55
11.2 Dynamic segment download . 56
11.2.1 Background and assumptions . 56
11.2.2 MPD information and timing model . 56
11.2.2.1 MPD information . 56
11.2.2.2 Segment information derivation . 57
11.2.2.2.1 Introduction . 57
11.2.2.2.2 Definitions . 57
11.2.2.2.3 MPD information. 57
11.2.2.2.4 Period information . 57
11.2.2.2.5 Representation information . 58
11.2.2.2.6 Media time information of segment . 58
11.2.2.2.7 Segment List parameters . 58
11.2.2.2.8 URL generation with segment template . 60
11.2.3 Service offering requirements and guidelines . 60
11.2.3.1 General service offering requirements . 60
11.2.3.2 Dynamic service offering guidelines . 60
11.2.3.2.1 Introduction . 60
11.2.3.2.2 Basic parameter settings . 61
11.2.3.3 Content offering with Periods . 62
11.2.3.3.1 General . 62
11.2.3.4 Joining recommendation . 64
11.2.4 Client operation, recommendations and guidelines (informative) . 65
11.2.4.1 Basic operation . 65
11.2.4.2 Joining, initial buffering and playout recommendations . 67
11.2.4.2.1 General . 67
11.2.4.2.2 Joining at the live edge . 67
11.2.5 Considerations on live edge . 67
11.3 Live services with MPD updates . 68
11.3.1 Background and assumptions . 68
11.3.2 Preliminaries . 68
11.3.2.1 MPD information . 68
11.3.2.2 Segment Information derivation . 69
11.3.3 Service offering requirements and guidelines . 69
11.3.3.1 General . 69
11.3.3.2 Setting the minimum update period value . 70
11.3.3.3 Permitted updates in an MPD. 70
11.3.3.4 Last segment message . 70
11.3.4 MPD-based live client operation based on MPD . 71
11.4 Provisioning of live content in On-Demand mode . 71
11.4.1 Scenario . 71
11.4.2 Content Offering Requirements and Recommendations . 72
11.4.3 Client behaviour . 72
11.5 Availability time synchronization between client and server . 72
11.5.1 Background . 72
11.5.2 Service Provider requirements and guidelines . 73
11.5.3 Client requirements and guidelines . 73
11.6 Robust operation . 74
11.6.1 General robustness . 74
11.6.2 Synchronization loss of segmenter . 74
11.6.3 Encoder clock drift. 74
11.6.4 Segment unavailability . 74
11.6.5 Swapping across redundant tools . 74
12 Ad insertion enablers . 75
12.1 Background . 75
12.2 Enablers . 75
12.2.1 Period elements and Remote Periods . 75
12.2.2 Asset identifiers . 75
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12.2.3 MPD updates . 76
13 Server And Network-assisted DASH (SAND) support . 76
13.1 Introduction . 76
13.2 SAND modes for 3GP-DASH . 76
13.3 DANE discovery . 77
13.4 SAND messages and protocols for 3GP-DASH . 77
13.5 SAND message handling behaviours for DANEs and DASH clients . 79
13.5.1 DASH client behaviour . 79
13.5.2 DANE behaviour . 80
13.6 Use of SAND for Network Assistance . 80
13.6.1 General description . 80
13.6.2 Common functions . 81
13.6.2.1 Introduction . 81
13.6.2.2 DANE discovery . 81
13.6.2.3 Network Assistance session initiation . 81
13.6.2.4 Network Assistance session termination . 81
13.6.3 Rate recommendation function . 82
13.6.4 Temporary delivery boost function . 82
13.6.5 SAND messages usage and extensions . 82
13.6.5.1 Introduction . 82
13.6.5.2 Use of existing SAND messages . 82
13.6.5.2.1 Shared resource allocation . 82
13.6.5.2.2 Buffer level . 83
13.6.5.2.3 Shared resource assignment . 83
13.6.5.3 SAND message extensions . 83
13.6.5.3.1 Network Assistance session initiation . 83
13.6.5.3.2 Network Assistance session termination . 84
13.6.5.3.3 Segment duration . 85
13.6.5.3.4 Delivery boost request . 85
13.6.5.3.6 Delivery boost response. 86
13.6.6 Network Assistance transactions . 87
13.6.6.1 General . 87
13.6.6.2 Network Assistance request . 87
13.6.7 Example workflow for Network Assistance . 90
13.7 Use of SAND for proxy caching . 91
13.7.1 Introduction. 91
13.7.2 Status messages for proxy caching . 91
13.7.2.1 AnticipatedRequests . 91
13.7.2.2 AcceptedAlternatives . 91
13.7.3 PER messages for proxy caching . 92
13.7.3.1 ResourceStatus . 92
13.7.3.2 MPDValidityEndTime . 92
13.7.3.3 DeliveredAlternative . 92
13.7.4 Example workflow on SAND use for proxy caching . 93
13.8 Use of SAND for consistent QoE/QoS. 94
13.9 SAND extension messages XML schema . 96
13.10 SAND for multi-network access mode . 97
13.10.1 Introduction. 97
13.10.2 DANE functionalities for SAND4M. 98
13.10.3 DASH client functionalities for SAND4M . 98
13.10.4 Message Channel . 98
13.10.4.1 General . 98
13.10.4.2 Assistance. 99
13.10.4.3 Enforcement . 99
13.10.4.4 Error case . 99
14 Auxiliary metrics and reporting . 99
14.1 General . 99
14.2 Interactivity Usage metrics and reporting . 99
14.2.1 Introduction. 99
14.2.2 Interactivity Usage metric definitions . 100
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14.2.2.1 Introduction . 100
14.2.2.2 Interactivity summary . 100
14.2.2.3 Interactivity event list . 101
14.2.3 Interactivity usage reporting scheme . 101
14.2.4 Interactivity metrics . 103
14.2.5 Interactivity Usage reporting protocol . 103
14.2.5.1 General . 103
14.2.5.2 Report format .
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