Content for  TR 26.998  Word version:  18.1.0

Similar to clause 6.5.3, the shared AR conversational experience may be instantiated in various 5G systems:

1. The MTSI architecture (TS 26.114) supports audio and 2D video conversational services.
2. Extending the 5GMS architecture (TS 26.501) to support AR conversational services by combining live uplink and live downlink.
3. An architecture based on something different than MTSI / IMS or 5GMS, for example WebRTC.

For the comparison between different instantiations, please refer to Table 6.5.3-1.

Based on the use cases, the following formats, codecs and packaging formats are of relevance for Media Streaming of AR:

• Scene Graph/Description
• 2D Video Formats
• 3D Formats such as static and dynamic point clouds or meshes
• Animated 3D meshes
• 2D Video Formats with depth
• Mono, stereo, and spatial audio formats
• Several video decoding instances
• Decoding tools for such formats
• Encoding tools for 2D formats
• Low-latency downlink and uplink real-time streaming of the above media
• Uplink streaming of pose information
• Uplink streaming of media

The list of potential standardization area that has been collected is provided in the following:

• Immersive media format and simplified media formats with integration into relevant 5G architecture
• Scene description format, functionality, and profile as an entry point of immersive media
• Scene description update mechanism
• Relevant subset of media codecs for different media types and formats
• CMAF encapsulation of immersive media for 5G media streaming
• Media payload format to be mapped into RTP streams
• Capability exchange mechanism and relevant signalling
• Low-latency uplink streaming of captured AR data
• Functionalities and session management to support split rendering and network-based media processing allocation with 5G edge/MRF
• Required QoS and QoE for shared AR/MR conversational experience service