5G Multicast Broadcast Services (MBS): Reference Tools | The Media Connectivity Association

The reference tools cover the MBS User Services of TS 26.502 and the MBS functions of the 5G Core and NG-RAN.

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What's Built

The MBS User Service reference architecture: in the UE, the MBS-Aware Application and the MBS Client with its MBSF Client and MBSTF Client; in the DN, the MBSF, MBS AF, MBSSF, MBS AS and MBSTF, with the NEF, PCF and MB-SMF, and the MBS Application Provider. The MBS-Aware Application (rt-mbs-application), the MBS Client (rt-mbs-client), the MBSF and MBS AF (rt-mbs-function), the MBSTF (rt-mbs-transport-function) and the MBS Application Provider (rt-mbs-application-provider) are provided by the Reference Tools. The key also lists rt-5gc-service-consumers and rt-libflute as dependencies, and rt-mbs-examples and rt-media-origin. — MBS User Service reference architecture, with Reference ToolsBased on TS 26.502 V19.6.0, figure 4.3.1-1

The 5G System architecture for multicast and broadcast in reference point representation. The AMF, SMF, MB-SMF and MB-UPF are provided by open5gs, the NG-RAN by srsRAN_Project_mbs, the UE by srsRAN_4G_mbs, and the MBSF, MBSTF and application provider by the rt-mbs repositories. — 5G System architecture for MBS, with Reference ToolsBased on TS 23.247 V20.0.0, figure 5.1-2

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Repositories & Releases

Early Access: available to members first

gNodeB with support for MBSsrsRAN_Project_mbs

v0.1.4-5mbs-srsRAN_Project2026-07-14 · 15w ago

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MBS Application Providerrt-mbs-application-provider

no release yet

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MBS Clientrt-mbs-client

no release yet

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MBS Function (MBSF)rt-mbs-function

rt-mbs-function-1.1.02026-07-03 · 16w ago

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MBS Tools and Examplesrt-mbs-examples

rt-mbs-examples-v0.4.02026-10-02 · 3w ago

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MBS Transport Function (MBSTF)rt-mbs-transport-function

rt-mbs-transport-function-1.4.02026-07-03 · 16w ago

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MBS-Aware Applicationrt-mbs-application

no release yet

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UE with support for MBSsrsRAN_4G_mbs

v0.1.4-5mbs-srsRAN_4G2026-07-14 · 15w ago

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Also used by 3GPP RAN and Core Platforms

5G Core Service Consumersrt-5gc-service-consumers

rt-5gc-service-consumers-2.1.12026-06-05 · 20w ago

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5G-MAG's fork of Open5GSopen5gs

v0.1.4-5mbs-v2.7.2-o5gs2026-07-14 · 15w ago

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Also used by Content Delivery Protocols and Tools

FLUTE Protocol and Profilesrt-libflute

rt-libflute-0.12.42026-09-01 · 8w ago

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Media Origin Server and Packagerrt-media-origin

no release yet

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Developer Updates

Last Synced: 2026-10-27 02:34 UTC

Early Access: available to members first

rt-mbs-function

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2,118 clones

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rt-mbs-transport-function

778 views

1,257 clones

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rt-mbs-examples

2,269 views

1,137 clones

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rt-libflute

1,036 views

3,151 clones

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rt-media-origin

29 views

8 clones

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open5gs

868 views

1,999 clones

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rt-mbs-application-provider

39 views

64 clones

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rt-mbs-client

172 views

92 clones

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rt-mbs-application

51 views

65 clones

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srsRAN_4G_mbs

56 views

77 clones

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srsRAN_Project_mbs

69 views

69 clones

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rt-5gc-service-consumers

245 views

1,451 clones

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Open Pull Requests

rt-mbs-transport-functionmbstf: serve every unicast packet session on the configured packetIngest portReady#84 · 4d ago

rt-mbs-transport-functionmbstf: announce an object for at least a minimum time in the FDT, whatever the origin saysReady#81 · 1w ago

rt-libfluteReceiver: take tunnel datagrams as they are when no packet_modifier is givenReady#116 · 1w ago

srsRAN_4G_mbsdocs: apply the 5G-MAG README formatReady#3 · 4w ago

srsRAN_Project_mbsdocs: apply the 5G-MAG README formatReady#2 · 4w ago

rt-5gc-service-consumersdocs: apply the 5G-MAG README formatReady#35 · 4w ago

rt-mbs-examplesMBS Broadcast end-to-end demonstration: 5GC, MBSF, MBSTF, gNB and UE with DASH over broadcastDraft#33 · 7w ago

rt-libfluteFor Profile None: WEBRC congestion control (RFC 3738), unverified: no conformance claimedReady#98 · 9w ago

rt-libfluteFor Profile None: FLUTE version 2 (RFC 6726) signalling, off by default: step one of three, no conformance claimedReady#65 · 11w ago

rt-libfluteFor Profile None: RFC 6330 RaptorQ FEC scheme (not 3GPP-mandated, offered as reference work)Ready#64 · 11w ago

rt-mbs-application-providerFix TS 29.580 compliance gaps in the User Service tree UIDraft#3 · 11w ago

rt-mbs-clientFix MBS Broadcast reception on software TUN interfaces + Service Announcement bootstrapDraft#3 · 11w ago

rt-mbs-applicationFix playable entry-point discovery and a Service Announcement UI overlapDraft#2 · 11w ago

srsRAN_4G_mbsFix MBS Broadcast reception: concurrent-session support, MCCH phase-lock, PDCP bootstrapDraft#2 · 11w ago

srsRAN_Project_mbsFix MBS Broadcast: concurrent-session LCID collision, MCCH/MTCH bugs, and crashesDraft#1 · 11w ago

Media delivery over 5G Multicast Broadcast Services

Contributors & How to Contribute​

What's Built​

Repositories & Releases​

Also used by 3GPP RAN and Core Platforms

Also used by Content Delivery Protocols and Tools

Developer Updates​

Open Pull Requests​

Contributors & How to Contribute

What's Built

Repositories & Releases

Developer Updates

Open Pull Requests