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Content for TR 26.862 Word version: 17.0.0

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4.1 Main ITT4RT Use Case 4.2 Use Case Extension 1: Viewport sharing among remote participants 4.3 Use Case Extension 2: Viewport-dependent stream for display device 4.4 Use Case Extension 3: Viewport sharing for second display device 4.5 Use Case Extension 4: Separate stream for presentation content 4.6 Use Case Extension 5: Applications to 3GPP FLUS 4.7 Use Case Extension 6: Multiple Overlays 4.8 Use Case Extension 7: Audio mixing of multiple streams in ITT4RT 6.1 General 6.2 Potential architecture extensions 7.1 Frame packing of overlays 7.2 Conditional overlays

4 Use Cases p. 7

4.1 Main ITT4RT Use Case p. 7

4.2 Use Case Extension 1: Viewport sharing among remote participants p. 11

4.3 Use Case Extension 2: Viewport-dependent stream for display device p. 12

4.4 Use Case Extension 3: Viewport sharing for second display device p. 14

4.5 Use Case Extension 4: Separate stream for presentation content p. 16

4.6 Use Case Extension 5: Applications to 3GPP FLUS p. 16

4.7 Use Case Extension 6: Multiple Overlays p. 17

4.7.1 Scenario 1 p. 17

4.7.2 Scenario 2 p. 18

4.8 Use Case Extension 7: Audio mixing of multiple streams in ITT4RT p. 18

4.8.1 Use Case p. 18

5 Requirements p. 19

6 Architecture p. 22

6.1 General p. 22

6.2 Potential architecture extensions p. 23

6.2.1 Network-based Media Processing p. 23

6.2.1.1 Introduction p. 23

6.2.1.2 Example Architecture p. 23

7 Potential Solutions p. 24

7.1 Frame packing of overlays p. 24

7.1.1 SDP Signalling and Examples p. 24

7.1.2 Bitstream Signalling p. 27

7.2 Conditional overlays p. 29

7.2.1 Introduction p. 29

7.2.2 Potential solution using RTCP p. 29

7.2.3 Potential solution using SDP p. 30

8 Selected solutions in TS 26.114 p. 30

$ Change history p. 31