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Content for TR 23.700-90 Word version: 18.0.0

0… 4… 7… 8…

7.1 Solution on functional architecture enhancements to support location information 7.2 Solutions on providing location information 7.3 Private call using functional alias towards a partner MC system 7.4 Functional alias support for migrated users 7.5 Migration during an ongoing group communication 7.6 Migration during an ongoing private communication 7.7 Optimize the connectivity between MC systems 7.8 Private call using functional alias towards a partner MC system 7.9 Solution on IP connectivity between MC systems 7.10 Solution on migration without interconnection between two MC systems 7.11 Private call forwarding between MCPTT systems 7.12 Private call transfer between MCPTT systems

7 Solutions p. 10

7.1 Solution on functional architecture enhancements to support location information p. 10

7.1.1 General p. 10

7.1.2 Solution description p. 10

7.1.2.1 Functional architecture p. 10

7.1.2.2 Reference points p. 10

7.1.3 Solution evaluation p. 11

7.2 Solutions on providing location information p. 11

7.2.1 General p. 11

7.2.2 Solution description p. 11

7.2.2.1 Immediate location information requests and reports p. 11

7.2.2.2 History location information requests and reports p. 11

7.2.2.3 Event triggered location information reports based on subscriptions p. 11

7.2.2.4 Configuration of event triggered location information reports p. 11

7.2.2.5 Handling of location information subscriptions p. 11

7.2.3 Solution evaluation p. 12

7.3 Private call using functional alias towards a partner MC system p. 12

7.3.1 General p. 12

7.3.2 Solution description p. 12

7.3.2.1 Principle p. 12

7.3.2.2 Configuration p. 12

7.3.2.3 Messages p. 13

7.3.2.4 Procedure p. 13

7.3.3 Solution evaluation p. 14

7.4 Functional alias support for migrated users p. 15

7.4.1 General p. 15

7.4.2 Solution description p. 15

7.4.2.1 Principle p. 15

7.4.2.2 Procedure p. 15

7.4.2.3 Configuration p. 16

7.4.3 Solution evaluation p. 16

7.5 Migration during an ongoing group communication p. 16

7.5.1 General p. 16

7.5.2 Solution description p. 17

7.5.2.1 Procedure p. 17

7.5.3 Solution evaluation p. 18

7.6 Migration during an ongoing private communication p. 18

7.6.1 General p. 18

7.6.2 Solution description p. 18

7.6.2.1 Procedure p. 18

7.6.2.2 Information flows p. 19

7.6.2.2.1 MCPTT private call suspend request p. 19

7.6.2.2.2 MCPTT private call suspend response p. 19

7.6.2.2.3 MCPTT private call resume request (MCPTT client to MCPTT server) p. 19

7.6.2.2.3a MCPTT private call resume request (MCPTT server to MCPTT server) p. 20

7.6.2.2.3b MCPTT private call resume request (MCPTT server to MCPTT client) p. 21

7.6.2.2.4 MCPTT private call resume response (MCPTT client to MCPTT server) p. 21

7.6.2.2.4a MCPTT private call resume response p. 21

7.6.3 Solution evaluation p. 22

7.7 Optimize the connectivity between MC systems p. 22

7.7.1 General p. 22

7.7.2 Solution description p. 22

7.7.2.1 Principle p. 22

7.7.2.2 Procedure p. 22

7.7.2.3 Configuration p. 24

7.7.2.4 Information flows p. 24

7.7.2.4.1 General p. 24

7.7.2.4.2 Request MC user info p. 24

7.7.2.4.3 Response MC user info p. 24

7.7.3 Solution evaluation p. 24

7.8 Private call using functional alias towards a partner MC system p. 25

7.8.1 General p. 25

7.8.2 Solution description p. 25

7.8.2.1 Principle p. 25

7.8.2.2 Functional alias clarification p. 25

7.8.2.3 Functional alias resolution p. 26

7.8.2.3.1 MCPTT functional alias resolution response p. 26

7.8.2.3.2 MCPTT functional alias resolution request p. 26

7.8.2.4 Procedure p. 26

7.8.3 Solution evaluation p. 28

7.9 Solution on IP connectivity between MC systems p. 28

7.9.1 General p. 28

7.9.2 Solution description p. 28

7.9.2.1 Functional model p. 28

7.9.2.2 Reference points p. 29

7.9.2.3 Procedures and flows p. 29

7.9.3 Solution evaluation p. 29

7.10 Solution on migration without interconnection between two MC systems p. 29

7.10.1 General p. 29

7.10.2 Solution description p. 29

7.10.3 Solution evaluation p. 30

7.11 Private call forwarding between MCPTT systems p. 30

7.11.1 General p. 30

7.11.2 Solution description p. 30

7.11.2.1 Principle p. 30

7.11.2.2 Messages p. 30

7.11.2.3 Procedure p. 32

7.11.2.3.1 MCPTT private call forwarding with target of the MCPTT private call forwarding in partner MCPTT system p. 32

7.11.2.3.2 MCPTT private call forwarding with MCPTT private call forwarding occurring in the partner MCPTT system p. 34

7.11.3 Solution evaluation p. 36

7.12 Private call transfer between MCPTT systems p. 36

7.12.1 General p. 36

7.12.2 Solution description p. 36

7.12.2.1 Principle p. 36

7.12.2.2 Impact on information flows p. 36

7.12.3.2 Procedures p. 37

7.12.3.2.1 MCPTT private call announced transfer with target in partner MCPTT system p. 37

7.12.3.2.2 MCPTT private call announced transfer with transferring MCPTT user in partner MCPTT system p. 40