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TR 23.768 (SA2)
Study on Architecture enhancements to support
Group Communication System Enablers for LTE (GCSE_LTE)

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V12.1.0 (Wzip)  2014/06  63 p.

Rapporteur:  Mr. Liebhart, Rainer

The present document captures the results of the study and evaluation of possible solutions for architectural enhancements to support Group Communication System Enablers for LTE (GCSE_LTE).

full Table of Contents for  TR 23.768  Word version:   12.1.0

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1  ScopeWord-p. 7
2  ReferencesWord-p. 7
3  Definitions and abbreviationsWord-p. 8
4  Assumptions and architectural requirementsWord-p. 8
4.1  GeneralWord-p. 8
4.2  High-level reference diagramWord-p. 9
4.3  Reference pointsWord-p. 10
4.4  AssumptionsWord-p. 10
4.5  Architectural requirementsUpWord-p. 10
5  Key IssuesWord-p. 10
5.1  Key Issue #1: Decision point for using PtP and/or PtMWord-p. 10
5.2  Key Issue #2: GCSE_LTE interaction with ProSe UE-to-Network RelaysWord-p. 11
5.3  Key Issue #3: Group Communication with geographical scopeWord-p. 11
5.4  Key Issue #4: MuSe with additional media handlingWord-p. 12
5.5  Key Issue #5: Service continuityWord-p. 12
5.6  Key Issue #6: Roaming supportWord-p. 12
5.7  Key Issue #7: InterworkingWord-p. 12
5.8  Key Issue #8: Priority and Pre-emption on Group CommunicationWord-p. 13
6  SolutionsWord-p. 13
6.1  Solution 1 - Group Communications using pre-established eMBMS bearersUpWord-p. 13
6.2  Solution 2 - GCSE AS counting of UEs per group per cellWord-p. 20
6.3  Solution 3 - Group Communications with MuSe (eNB centric)Word-p. 22
6.4  Solution 4 - GCSE architecture using IMS and eMBMSWord-p. 28
6.5  Solution 5 - Group communications with pre-established MBMS broadcast Bearers and multicast/unicast switchingUpWord-p. 31
6.6  Solution 6: MuSe with configurable geographic scopeWord-p. 36
6.7  Solution 7: Assign and Re-assign Priority and Pre-emption capability for the GCWord-p. 40
6.8  Solution 8: Service continuity from unicast to multicast deliveryUpWord-p. 42
6.9  Solution 9: Group Management and associated user interactionWord-p. 44
6.10  Solution 10: Using pre-established eMBMS bearers as generic multicast delivery bearerWord-p. 45
6.11  Solution 11: Scalability above the SGi referenceWord-p. 46
7  EvaluationWord-p. 47
7.1  Common approachWord-p. 47
7.2  GCSE_LTE common solution approach with respect to Group Management considerationsWord-p. 53
8  ConclusionsWord-p. 55
A  QoS and bearer parameters for Group CommunicationsWord-p. 58
B  Change historyWord-p. 63

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