Change Request Summary: High Level Media Data Workflows for All-in-Client Configuration
CR Metadata
- Document: 3GPP TR 26.958 v0.1.1
- CR Category: B (addition of feature)
- Release: Rel-20
- Work Item: FS_3DGS_MED (3D Gaussian Splatting Media Study)
- Source: Samsung Electronics Co. Ltd.
Purpose
This CR adds high level media data workflows for the All-in-client configuration to the 3D Gaussian Splatting (3DGS) media study. The workflows describe how different 3DGS service use cases can be realized when processing steps primarily run on the UE.
Technical Contributions
New Clause 9.1: All-in-Client Configuration
9.1.1 Description
Defines the All-in-client configuration as workflows where functionality primarily runs on the UE for the use cases described in clause 5 of the technical report.
9.1.2 Media Workflow Steps
Workflow Description
The CR identifies the following key workflow steps that can be executed on the UE:
- Scene Capture
- Utilizes UE cameras (rear or front) on mobile devices
- Supports multiple viewpoint capture for coverage and parallax
- Includes application-guided user interaction
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Collects auxiliary signals (references clause 5.2)
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3DGS Model Generation
- Generation of static 3DGS models on UE (subject to device capability)
-
Referenced to clause 5.2
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Animation Stream Generation
- Creation of time-aligned animation streams for 3D Avatar animation
-
Referenced to clause 5.5
-
Packaging and Distribution
- 3DGS assets (static objects, scenes, or dynamic sequences) and animation streams are packaged
- Distribution via multiple channels: MMS, OTT messaging, or download
- Supports UE-to-UE or UE-to-network device transmission
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Referenced to clauses 5.2 and 5.5
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Asset Reception and Storage
- UE receives one or more 3DGS assets
- Storage in local memory or GPU memory
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Supports dynamic 3DGS scene content via file delivery (clause 5.4)
-
Rendering
- Gaussian selection based on Level of Detail (LOD)
- LOD selection dependent on:
- User preferences
- UE device capabilities and characteristics
- Camera pose
- Display resolution
- Support for time-aligned animation streams
- Referenced to clauses 5.2 and 5.5
Configuration Characteristics
The CR defines three key characteristics for the All-in-client configuration:
- Latency/Performance
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Dependent on UE device capabilities for capture, generation, and rendering operations
-
Scalability
-
Limited by UE device capabilities:
- Local memory
- GPU memory
- Decoding capabilities
-
Network Usage
- Network only used for distribution/asset transfer
- No network interaction during playback
- All viewpoint updates and navigation handled locally after 3DGS data reception
Impact Assessment
The CR states that if not approved, the study would be incomplete, indicating this is a foundational contribution to the 3DGS media workflows study.