Content for TR 23.768 Word version: 12.1.0
4 Assumptions and architectural requirements
5 Key Issues
6 Solutions
7 Evaluation
8 Conclusions
A QoS and bearer parameters for Group Communications
$ Change History
4 Assumptions and architectural requirements p. 8
4.1 General p. 8
4.2 High-level reference diagram p. 9
4.3 Reference points p. 10
4.4 Assumptions p. 10
4.5 Architectural requirements p. 10
5 Key Issues p. 10
5.1 Key Issue #1: Decision point for using PtP and/or PtM p. 10
5.2 Key Issue #2: GCSE_LTE interaction with ProSe UE-to-Network Relays p. 11
5.3 Key Issue #3: Group Communication with geographical scope p. 11
5.4 Key Issue #4: MuSe with additional media handling p. 12
5.5 Key Issue #5: Service continuity p. 12
5.6 Key Issue #6: Roaming support p. 12
5.7 Key Issue #7: Interworking p. 12
5.8 Key Issue #8: Priority and Pre-emption on Group Communication p. 13
6 Solutions p. 13
6.1 Solution 1 - Group Communications using pre-established eMBMS bearers p. 13
6.1.1 Functional description p. 13
6.1.2 Procedures p. 15
6.1.2.1 Group Communication Setup using pre-established eMBMS bearers p. 15
6.1.2.2 Service continuity during unicast and MBMS switching p. 16
6.1.3 Impact on existing entities and interfaces p. 20
6.1.4 Solution evaluation p. 20
6.2 Solution 2 - GCSE AS counting of UEs per group per cell p. 20
6.2.1 Functional description p. 20
6.2.2 Procedures p. 20
6.2.3 Impact on existing entities and interfaces p. 21
6.2.4 Solution evaluation p. 22
6.3 Solution 3 - Group Communications with MuSe (eNB centric) p. 22
6.3.0 Overview p. 22
6.3.1 Functional description p. 23
6.3.2 Procedures p. 24
6.3.2.1 Multicast Delivery Setup p. 24
6.3.2.2 MuSe and Mobility handling p. 25
6.3.2.3 MuSe with voice and video media handling p. 26
6.3.3 Impact on existing entities and interfaces p. 28
6.3.4 Solution evaluation p. 28
6.4 Solution 4 - GCSE architecture using IMS and eMBMS p. 28
6.4.1 Functional description p. 28
6.4.2 Procedures p. 29
6.4.2.1 General p. 29
6.4.2.2 GCSE group communication procedures p. 29
6.4.2.2.1 Switching from unicast to eMBMS delivery for an ongoing GCSE group communication session p. 29
6.4.2.3 GCSE Group membership procedures p. 31
6.4.3 Impact on existing entities and interfaces p. 31
6.4.4 Solution evaluation p. 31
6.5 Solution 5 - Group communications with pre-established MBMS broadcast Bearers and multicast/unicast switching p. 31
6.5.1 Functional description p. 31
6.5.2 Procedures p. 33
6.5.3 Impact on existing entities and interfaces p. 36
6.5.4 Solution evaluation p. 36
6.6 Solution 6: MuSe with configurable geographic scope p. 36
6.6.1 General description p. 36
6.6.2 Procedures p. 36
6.6.2.1 Group Communication within configured Geographic Service Area p. 36
6.6.2.2 Group Communication with geographic service area override and filtering p. 38
6.6.3 Impact on existing entities and interfaces p. 40
6.6.4 Solution evaluation p. 40
6.7 Solution 7: Assign and Re-assign Priority and Pre-emption capability for the GC p. 40
6.7.1 Solution description p. 40
6.7.1.1 General p. 40
6.7.1.2 Session Setup Procedure p. 40
6.7.1.3 Session update Procedure p. 41
6.7.1.4 Session Release Procedure p. 41
6.7.2 Impact on existing entities and interfaces p. 41
6.7.3 Solution evaluation p. 42
6.8 Solution 8: Service continuity from unicast to multicast delivery p. 42
6.8.1 Functional Description p. 42
6.8.2 Procedures p. 42
6.8.3 Impact on existing entities and interfaces p. 44
6.8.4 Solution evaluation p. 44
6.9 Solution 9: Group Management and associated user interaction p. 44
6.9.1 UE and GCSE AS roles and requirements p. 44
6.9.2 Group management not at BM-SC level p. 44
6.9.3 Solution evaluation p. 45
6.10 Solution 10: Using pre-established eMBMS bearers as generic multicast delivery bearer p. 45
6.11 Solution 11: Scalability above the SGi reference p. 46
7 Evaluation p. 47
7.1 Common approach p. 47
7.1.1 GC2 p. 48
7.1.1.1 Information exchanged between GCSE AS and BM-SC p. 48
7.1.1.2 GC2 procedure p. 48
7.1.1.3 Control plane and User plane of GC2 p. 49
7.1.2 Roaming Architecture p. 49
7.1.3 Call flows and procedures p. 51
7.1.3.1 Downlink Media path setup for multipoint service p. 51
7.1.3.1.1 General p. 51
7.1.3.1.2 Pre-established eMBMS bearers p. 51
7.1.3.1.3 Dynamic eMBMS bearers p. 51
7.1.3.2 Media Traffic using unicast and eMBMS on DL p. 52
7.1.3.3 Service continuity procedures between unicast and multipoint service p. 52
7.1.3.3.1 Unicast to eMBMS p. 52
7.1.3.3.2 eMBMS to Unicast p. 52
7.2 GCSE_LTE common solution approach with respect to Group Management considerations p. 53
8 Conclusions p. 55
A QoS and bearer parameters for Group Communications p. 58
$ Change History p. 63
