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Content for TR 22.828 Word version: 13.0.0

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4.1 Use Case 1 - CSIPTO for non-IMS Use Case 4.2 Use Case 2 - CSIPTO always-on dual PDN connection 4.3 Use Case 3 - CSIPTO on-demand dual PDN connection

4 Use Cases p. 6

4.1 Use Case 1 - CSIPTO for non-IMS Use Case p. 6

4.1.1 Description p. 6

4.1.2 Pre-conditions p. 7

4.1.4 Post-conditions p. 8

4.1.5 Potential impacts or interactions with existing services/features p. 8

4.1.6 Potential requirements p. 8

4.2 Use Case 2 - CSIPTO always-on dual PDN connection p. 9

4.2.1 Description p. 9

4.2.2 Pre-conditions p. 9

4.2.3 Service flows p. 9

4.2.4 Post-conditions p. 10

4.2.5 Potential impacts or interactions with existing services/features p. 10

4.2.6 Potential requirements p. 10

4.3 Use Case 3 - CSIPTO on-demand dual PDN connection p. 11

4.3.1 Description p. 11

4.3.2 Pre-conditions p. 12

4.3.3 Service flows p. 12

4.3.4 Post-conditions p. 13

4.3.5 Potential impacts or interactions with existing services/features p. 13

4.3.6 Potential requirements p. 13

5 Considerations p. 14

5.1 Considerations on security p. 14

5.2 Considerations on charging p. 14

5.3 Considerations on evolution and rollout p. 14

5.4 Considerations on IMS p. 14

6 Potential requirements p. 15

6.2 Consolidated requirements p. 15

6.2.1 Establishing additional PDN connections; keeping and releasing PDN connections p. 15

6.2.2 Establishing and simultaneously using two PDN connections with the same PDN p. 15

6.2.3 Managing aggregate maximum bit rate when two PDN connections are used with the same PDN p. 16

7 Conclusion and Recommendations p. 16

A Mapping of potential requirements. p. 17

$ Change history p. 18