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TR 26.802
Multicast Architecture enhancement for 5G Media Streaming

3GPP‑Page   fToC↓   Partial Content →
V19.2.0 (Wzip)  2025/06  124 p.
V18.0.0  2024/12  … p.
V17.0.0  2021/06  82 p.
Rapporteur:
Dr. Stockhammer, Thomas
Qualcomm Germany

full Table of Contents for  TR 26.802  Word version:  19.2.0

each clause number in 'red' refers to the equivalent title in the Partial Content
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1Scope  p. 9
2References  p. 9
3Definitions of terms, symbols, and abbreviations  p. 11
3.1Terms  p. 11
3.2Abbreviations  p. 12
45G Media Streaming General Service Architecture and Principles  p. 13
4.1Introduction  p. 13
4.2Related 5G multicast and broadcast work in 3GPP  p. 13
4.2.1General  p. 13
4.2.2Existing 3GPP specifications on MBMS  p. 13
4.2.2.1Introduction  p. 13
4.2.2.2MBMS Delivery Methods  p. 14
4.2.2.3MBMS User Service  p. 14
4.2.2.4xMB reference point between content provider and BM-SC  p. 15
4.2.2.5MB2 reference point  p. 18
4.2.2.6MBMS reference client architecture  p. 20
4.2.2.7MBMS Application Programming Interface and URL  p. 20
4.2.3SA2 5MBS study item on architectural enhancements for 5G multicast-broadcast  p. 21
4.3Related multicast and broadcast streaming standardization efforts outside 3GPP  p. 24
4.3.2DVB-MABR Phase 1  p. 25
4.3.2.1Motivation  p. 25
4.3.2.2DVB-MABR data plane  p. 26
4.3.2.3DVB-MABR control plane  p. 26
4.3.2.4DVB-MABR deployment architecture  p. 27
4.3.2.5DVB-MABR session bootstrapping  p. 27
4.4Common architectural requirements and principles  p. 28
4.4.1General  p. 28
4.4.25G Media Streaming (5GMS) general architecture  p. 28
4.4.35G Multicast-Broadcast Services (5MBS) system architecture  p. 28
4.4.4Baseline Network Reference Architectures  p. 29
4.4.4.1General  p. 29
4.4.4.25GMSA functions in the Trusted DN  p. 30
4.4.4.35GMSA functions in an External DN  p. 31
4.4.5Client Architectures  p. 31
4.4.5.1Introduction  p. 31
4.4.5.2Standalone 5MBS client architecture  p. 32
4.4.5.35GMS client architecture using 5MBS (option A)  p. 34
4.4.5.45GMS client architecture using 5MBS (option B)  p. 35
5Key Issues  p. 37
5.1General  p. 37
5.2Key Issue#1: Support of multicast ABR in 5G Media Streaming Architecture  p. 37
5.2.1Description  p. 37
5.2.2Scenario #1: MABR operation of 5MBS-enhanced 5GMS System  p. 38
5.2.3Scenario #2: External DVB-MABR System interworking with 5MBS-enhanced 5GMS System  p. 38
5.2.4Initial assessment  p. 39
5.2.5Scope of study  p. 39
5.2.6Identified gaps  p. 40
5.2.6.1Scenario #1: MABR operation of 5MBS-enhanced 5GMS System  p. 40
5.2.6.2Scenario #2: External DVB-MABR System interworking with 5MBS-enhanced 5GMS System  p. 40
5.2.7Conclusions and next steps  p. 41
5.3Key Issue 2: Nmb2 Design Considerations  p. 41
5.3.1Description  p. 41
5.3.1.1General  p. 41
5.3.1.2Model of a BM-SC User-Plane Function for MBMS Download Delivery  p. 42
5.3.1.3Handling of In-band ancillary Information for MBMS Download Delivery  p. 43
5.3.1.4Multiplexing of In-band ancillary information  p. 44
5.3.1.5Review of existing xMB properties for MBMS Download MBSTF configuration  p. 44
5.3.1.6Model of a BM-SC User-Plane Function for Group Communication Delivery  p. 46
5.3.2Identified gaps  p. 47
5.3.3Conclusions  p. 48
5.4Key Issue #3: Collaboration and deployment scenarios  p. 48
5.4.1Description  p. 48
5.4.2Collaboration A  p. 48
5.4.3Collaboration B  p. 50
5.4.4Collaboration C  p. 52
5.4.5Collaboration D  p. 52
5.4.6Conclusion  p. 53
5.5Key Issue #4: Reuse of MBMS service layer  p. 53
5.5.1Description  p. 53
5.5.2Conclusions  p. 53
5.6Key Issue #5: Client Architecture Options  p. 54
5.6.1Description  p. 54
5.6.2Approach to solve  p. 54
5.6.3Conclusions  p. 54
5.7Key Issue #6: Hybrid Services  p. 55
5.7.1Description  p. 55
5.7.1.1Definition  p. 55
5.7.1.2Use Case 1: External Hybrid Service  p. 56
5.7.1.3Use Case 2: 5GMS Hybrid Service  p. 57
5.7.2Identified Issues  p. 58
5.7.2.1General  p. 58
5.7.2.2Use Case 1: External Hybrid Service  p. 58
5.7.2.3Use Case 2: 5GMS Hybrid Service  p. 58
5.7.3Conclusions and Next Steps  p. 59
5.8Key Issue #7: 5GMS via eMBMS  p. 60
5.8.1Description  p. 60
5.8.2Identified Issues  p. 60
5.8.2.1Introduction  p. 60
5.8.2.2Option A: 5GMS uses MBMS User Service  p. 61
5.8.2.2aOption B: 5MBS uses MBMS Transport-only Mode  p. 62
5.8.2.3Option C: 5GC integration of MBMS  p. 62
5.8.2.4Comparison of options  p. 63
5.8.3Conclusions  p. 63
5.8.4Recommended Next Steps  p. 63
5.9Key Issue #8: In-session unicast repair for MBS Object Distribution  p. 64
5.9.1Description  p. 64
5.9.2Collaboration scenarios  p. 64
5.9.3Architecture mappings  p. 65
5.9.4High-level call flows  p. 67
5.9.4.1Existing call flow for post-session object repair  p. 67
5.9.4.2In-session object repair call flow  p. 68
5.9.5Gap analysis and requirements  p. 69
5.9.6Candidate solutions  p. 69
5.9.7Summary and conclusions  p. 69
5.10Key Issue #9: MBS User Service and Delivery Protocols for eMBMS  p. 70
5.10.1Description  p. 70
5.10.2Collaboration scenarios and architecture mappings  p. 71
5.10.2.1Joint BM-SC + MBSF functionality  p. 71
5.10.2.2MBS User Services feeding only eMBMS  p. 72
5.10.2.3MBS User Services on top of eMBMS using Group Communication  p. 73
5.10.2.4MBS User Services on top of eMBMS using Transparent Delivery  p. 75
5.10.3High-level call flows  p. 77
5.10.3.1Joint BM-SC and MBSF Functionality  p. 77
5.10.3.2MBSF/MBSTF southbound interface to BM-SC via MB2'  p. 78
5.10.3.3MBSF/MBSTF southbound interface with xMB to BM-SC  p. 80
5.10.4Gap analysis and requirements  p. 80
5.10.4.1Joint BM-SC and MBSF Functionality  p. 80
5.10.4.2MBSF/MBSTF southbound interface to BM-SC via MB2  p. 80
5.10.4.3MBSF/MBSTF southbound interface to BM-SC via xMB  p. 80
5.10.5Candidate solutions  p. 80
5.10.6Summary and conclusions  p. 81
5.11Key Issue #10: Selected MBMS Functionalities not supported in MBS  p. 81
5.11.1Description  p. 81
5.11.2Gap analysis and requirements  p. 82
5.11.2.1Feature Comparison of MBMS and MBS User Services  p. 82
5.11.3Candidate solutions  p. 85
5.11.3.1Introduction  p. 85
5.11.3.2Application Services - MBS and hybrid  p. 85
5.11.3.3Partial file handling  p. 85
5.11.3.4Reporting and metrics  p. 85
5.11.3.5MBS-on-demand  p. 85
5.11.3.6Time synchronization  p. 85
5.11.4Summary and conclusions  p. 85
5.12Key Issue #11: Combined MBS multicast and unicast  p. 86
5.12.1Description  p. 86
5.12.1.1Background and examples  p. 86
5.12.1.2High-level solutions  p. 88
5.12.1.3MBMS Generic Application Service  p. 88
5.12.2.2Techniques for switching between service locations in the MBMS Client  p. 90
5.12.2.2.1General  p. 90
5.12.2.2.2Switching service locations using SAND4M  p. 91
5.12.2.2.3Switching service locations using DASH-IF Content Steering  p. 92
5.12.2.2.4Presentation manifest rewriting  p. 92
5.12.2Collaboration scenarios  p. 95
5.12.3Architecture mappings and call flows  p. 96
5.12.3.1Introduction  p. 96
5.12.3.2Mapping to MBS User Services using MBS AS  p. 96
5.12.3.3Mapping to MBS User Services using an external unicast server  p. 99
5.12.3.4Selective unicast requests from MBS Client  p. 99
5.12.4.1General  p. 99
5.12.4.2Mapping to MBS User Services using MBS AS  p. 99
5.12.4.3Mapping to MBS User Services using an external unicast server  p. 100
5.12.4.4Selective Unicast Requests from MBS Client  p. 100
5.12.5Candidate solutions  p. 100
5.12.5.1General  p. 100
5.12.5.2Mapping to MBS User Services using MBS AS  p. 100
5.12.5.3Mapping to MBS User Services using an external unicast server  p. 101
5.12.5.4Selective Unicast Requests from MBS Client  p. 101
5.12.6Summary and conclusions  p. 101
6Potential Standardization Areas  p. 101
6.1General  p. 101
6.2Potential Standardization Areas  p. 101
6.2.1Introduction  p. 101
6.2.25MBS User Service Architecture  p. 101
6.2.35GMS Hybrid Services  p. 102
7Potential Solutions  p. 104
7.1General  p. 104
7.2Support of multicast ABR in 5G Media Streaming Architecture  p. 104
7.2.1Mapping of DVB-MABR and CableLabs MABR reference architectures to 5MBS reference architecture for Scenario #1  p. 104
7.2.1.1Introduction  p. 104
7.2.1.2Mapping of logical functions  p. 105
7.2.1.3Mapping of logical reference points  p. 106
7.2.1.4Mapping to Collaboration B0  p. 108
7.2.2Interworking of DVB-MABR reference architecture with 5MBS reference architecture for Scenario #2  p. 110
7.2.2.1Introduction  p. 110
7.2.2.2Interworking architecture for Collaboration C  p. 111
7.2.2.3Interworking architecture for Collaboration D  p. 114
7.3Multicast-Broadcast User Service  p. 116
7.3.1Introduction  p. 116
7.3.2MBSF  p. 117
7.3.3MBSTF  p. 117
7.3.45MBS together with 5G Media Streaming Architecture  p. 118
7.3.5Hybrid 5GMS unicast and 5MBS services  p. 119
8Conclusions and Next Steps  p. 119
8.1General  p. 119
8.2Conclusions  p. 120
8.3Recommended normative work arising from version 17  p. 120
8.4Recommended follow-up work arising from version 19  p. 121
8.4.1Introduction  p. 121
8.4.2Recommendations for stage 2 normative work arising from version 19  p. 121
8.4.3Recommendations for stage 3 normative work arising from version 19  p. 122
8.4.4Recommendations for further study arising from version 19  p. 123
8.4.5Recommendations for coordination arising from version 19  p. 123
$Change history  p. 124

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