Multimedia Broadcast multicast service Single Frequency Network

In Release 15, the MBSFN function was enhanced to support new capabilities including server-initiated broadcast group call release, MBMS reception in Receive Only Mode, and the broadcast of positioning assistance data. The release also introduced multi-server MBMS bearer coordination and enabled the GCS AS to request the application of FEC and/or header compression (RoHC) to an MBMS bearer via MB2 improvements. Furthermore, procedures were aligned for MBMS session setup and event notification, and support was added for using MBMS for group configuration and state handling in mission-critical services.

• MBMS bearer event notification TS 23.280CR0025
• Header compression for MC services over MBMS TS 23.280CR0058
• Server-initiated Broadcast group call release procedure TS 23.379CR0096
• Usage of MBMS for MCVideo - signaling control TS 24.281CR0037
• Header compression over MBMS - signalling control TS 24.379CR0417
• Enabling MBMS Bearer Event Notification TS 36.300CR1138

+ 31 more changes

In Release 16, the MBSFN function was enhanced with new capabilities for dynamic group management, including broadcast group regroup procedures and user regroup, as well as support for functional aliases within broadcast group calls. It also introduced LTE-based 5G terrestrial broadcast and expanded broadcast assistance data delivery to include types like barometric pressure. Additionally, corrections and clarifications were made for operational aspects such as inter-frequency operation and specific MCH subframe configurations.

• Broadcast group regroup TS 23.280CR0174
• Group status notification over MBMS TS 23.280CR0178
• MBMS listening status report TS 23.280CR0181
• Broadcast group regroup TS 23.379CR0170
• Group regroup broadcast and rejection using preconfigured group TS 23.379CR0176
• Broadcast group regroup call using preconfigured group TS 23.379CR0182

+ 17 more changes

In Release 17, the enhancements for MBSFN included the introduction of new bands and bandwidth allocations specifically for LTE-based 5G terrestrial broadcast, alongside defining corresponding UE capabilities for these new configurations. The release also clarified procedures for setting MBMS broadcast areas during bearer activation and added an information flow for MBMS suspension reporting. Furthermore, it provided general corrections and clarifications for MBMS processes, including location reporting within the MBSFN.

• Clarification on setting the MBMS broadcast areas when activating MBMS bearer TS 23.280CR0255
• Introduction of new bands and bandwidth allocation for LTE-based 5G terrestrial broadcast TS 36.300CR1360
• Introduction of new bands and bandwidth allocation for LTE-based 5G terrestrial broadcast TS 36.331CR4750
• UE capabilities for new bands and bandwidth allocation for LTE-based 5G terrestrial broadcast TS 36.331CR4780
• Introducing single-bit approach for MINT [MINT] TS 36.331CR4810
• Addition of MBMS suspension report information flow TS 23.280CR0289

+ 5 more changes

In Release 18, enhancements to MBSFN for mission-critical services introduced specific procedures for ad hoc group calls within a single system for both MCPTT and MCVideo, including the ability to modify participant lists during an ongoing call. The release also defined procedures for establishing such calls using pre-established sessions and made corrections and clarifications to MBMS signaling, such as the MBMS Interest Indication and the MIB-MBMS systemFrameNumber field. Additionally, it introduced new broadcast assistance information for GNSS line-of-sight/non-line-of-sight conditions and refined MBMS bearer management by removing unicast bearer status from MBMS bearer information.

• Ad hoc group call procedures in single MCPTT system TS 23.379CR0324
• Modifying participants list of on-going ad hoc group call in single MCPTT system TS 23.379CR0326
• General adhoc group call procedures in single system - Protoc impl for MCVideo TS 24.281CR0221
• Adhoc group call participants modify procedures in single system - protoc impl MCVideo TS 24.281CR0226
• General Adhoc group call procedures using pre-established session in Single system - Protoc impl for MCVideo TS 24.281CR0229
• General Adhoc group call procedures using pre-established session in Single system - procedures at CF (mcvideo) TS 24.281CR0236

+ 11 more changes

In Release 19, key enhancements for MBSFN included the introduction of LTE-based 5G Broadcast Phase 2 capabilities and the support for CAS muting within that LTE-based broadcast framework. The release also introduced an In-session Unicast Repair procedure for MBMS Object Distribution and specified improvements for MBMS Time Synchronization. Furthermore, it added the MBMS delivery function to the MC gateway UE, expanding its role in the broadcast architecture.

• Modify list of participants by changing the criteria during an ongoing ad hoc group emergency alert (single MC system) TS 23.280CR0413
• Clarifications on temporary and pre-arranged MCPTT broadcast groups TS 23.379CR0357
• Modify list of participants by changing the criteria during an ongoing MCPTT ad hoc group call (single MC system) TS 23.379CR0360
• [AMD_PRO-MED] In-session Unicast Repair for MBMS Object Distribution TS 26.346CR0677
• Introduction of LTE-based 5G Broadcast Phase 2 TS 36.300CR1428
• Introduction of CAS muting in LTE-based 5G broadcast [5GB_CASMuting] TS 36.331CR5139

+ 13 more changes

In Release 20, the enhancement to MBSFN for Multimedia Broadcast Multicast Service introduced procedures to support call forwarding for Ad hoc Group calls within a single MCPTT system. This update specifically defined new service-associated signaling procedures for managing group call services, which are point-to-multipoint services where a single data unit is transmitted to multiple participants. The change focused on the functional group handling within the framework to enable this new multicast service capability.

• Call forwarding for Ad hoc Group calls single MCPTT system (procedures) TS 23.379CR0489