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Content for  TR 23.779  Word version:  13.0.0

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5  Candidate solutionsp. 19

5.1  Off-network operationsp. 19

5.1.1  Solution 1-1: Distributed mesh support for MCPTT off-network MCPTT group callsp. 19

5.1.2  Solution 1-2: Off-network MCPTT service using ProSe UE-to-UE relayp. 20

5.1.3  Solution 1-3: Application level device to device relay operation for off-network MCPTTp. 25

5.1.4  Solution 1-4: Group priority solution for off-network communication when UE in coverage of PLMN networkp. 31

5.1.5  Solution 1-5: MCPTT off-networkp. 33

5.2  On-network operationsp. 38

5.2.1  Solution 2-1: IMS based architecture for MCPTT applicationsp. 38

5.2.1.1  Functional descriptionp. 38

5.2.1.1.1  Overall architecturep. 38
5.2.1.1.2  Functionalities and capabilities already provided by existing technologiesp. 41
5.2.1.1.3  Overview of reference pointsp. 42
5.2.1.1.4  Reference Points Mappingp. 43
5.2.1.1.5  New Functional Entitiesp. 46

5.2.1.2  Proceduresp. 50

5.2.1.3  Impact on existing entities and interfacesp. 54

5.2.1.4  Solution evaluationp. 54

5.2.2  Solution 2-2: NGCN-based architecturep. 55

5.2.3  Solution 2-3: Generic high level architecture for MCPTT within a public safety ecosystem with user-based services application sublayerp. 59

5.2.4  Solution 2-4: Application domain routing over non-trusted SIP corep. 67

5.3  UE-to-network relayp. 79

5.4  Group managementp. 89


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