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Content for  TR 26.928  Word version:  17.0.0

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8 Conclusions and Proposed Next Steps 
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8  Conclusions and Proposed Next Steps  p. 79

In this study, frameworks for eXtended Reality (XR) have been analysed. XR referes a larger concept for representing reality that includes the virtual, augmented, and mixed realities. After defining key terms and outlining the QoE/QoS issues of XR-based services, the delivery of XR in the 5G system is discussed, following an architectural model of 5G media streaming defined in TS 26.501. In addition to the conventional service categories, conversational, interactive, streaming, and download, split compute/rendering is identified as a new delivery category. A survey of 3D, XR visual and audio formats was provided.
Use cases and device types have been classified, and processing and media centric architectures are introduced. This includes viewport independent and dependent streaming, as well as different distributed computing architecture for XR. Core use cases of XR include those unique to AR and MR in addition to those of VR discussed in TR 26.918, ranging from offline sharing of 3D objects, real-time sharing, multimedia streaming, online gaming, mission critical applications, and multi-party call/conferences.
Based on the details in the report, the following is proposed:
In the short-term:
  • Develop a flexible XR centric device reference architecture as well as a collection of device requirements and recommendations for XR device classes based on the considerations in clause 7.2. Device classes should include VR device for 6DoF streaming and XR online gaming (XR5G-V4), as well as AR devices (XR5G-A1, XR5G-A4 and XR5G-A5).
  • Develop a framework and basic functionalities for raster-based Split Rendering for Online Gaming according to the considerations in clause 7.4.
  • Document typical XR traffic characteristics in TR 26.925 based on the initial considerations in this report, in particular clause 7.7 and support other 3GPP groups in designing systems for XR services and applications.
  • Address simple extensions to MTSI to support XR conversational services based on the considerations in clause 7.5
  • Study detailed functionalities and requirements for glass-type AR/MR UEs with standalone capability according to clause 7.6 and addresses exchange formats for AR centric media, taking into account different processing capabilities of AR devices.
In the mid-term:
  • Based on the work developed in the short-term for raster-based split rendering, an extended Split and Cloud Rendering and Processing should be defined based on the considerations in clause 7.9, preferably preceded by a dedicated study
  • Address simple extensions to 5G Media Streaming to support 6DoF Streaming based on considerations in clause 7.3. Stage-2 aspects related to TS 26.501 should be considered first before starting detailed stage-3 work.
  • Based on the work developed in the shorter time frame above, address the considerations in more detailed considerations in clause 7.5 and clause 7.8 on Social XR
The work should be carried out in close coordination with other groups in 3GPP on XR related matter, edge computing and rendering as well in communication with experts in MPEG on the MPEG-I project as well as with Khronos on their work on OpenXR, glTF and Vulkan/OpenGL.
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