3GPP TR 26.501 Change Request Summary

Document Information

• CR Number: Pseudo CR for TR 26.958 v0.1.1
• Category: B (addition of feature)
• Release: Rel-20
• Work Item: FS_3DGS_MED
• Source: Samsung Electronics Co. Ltd.

Purpose

This CR addresses the mapping of 3D Gaussian Splatting (3DGS) services to 3GPP services and specifications for the Client-Server configuration. This complements the existing All-in-UE configuration mapping.

Main Technical Contributions

Clause 10.2: Client-Server Configuration Mapping

The CR introduces a comprehensive mapping table that defines how different 3DGS workflow functions map to existing 3GPP services when operating in a Client-Server configuration. In this configuration, 3DGS is delivered as either an interactive XR service or 6DoF media streaming.

Content Generation

• UE-side 2D Capture: Maps to Media-Aware Application (TS 26.501) and Split Rendering Client (TS 26.565)
• Network-side 3DGS Generation: Maps to (Edge) Media AS of Media Delivery architecture (TS 26.501), including:
• 3DGS scene generation from 2D capture
• Dynamic 3DGS content
• Region-based parts of 3DGS scenes

Caching

• 3DGS Model and Tile Caching: Utilizes 5G Edge CDN infrastructure

Delivery

• Streaming/Real-time Communication: Supports tiled LOD streaming using:
• Adaptive media delivery protocols (DASH, HLS, RTP, QUIC)
• Partial delivery or on-demand streaming
• 3GPP Mapping: (Edge) Media AS and Media Access Function (TS 26.501), Split Rendering Server (TS 26.565)

Network Rendering

• Edge Rendering: Partial or full network edge rendering
• 3GPP Mapping: (Edge) Media AS (TS 26.501) and Split Rendering Server (TS 26.565)

UE Rendering/Playback

• Client-side Rendering: Maps to Media-Aware Application (TS 26.501) and Split Rendering Client (TS 26.565)

Pose/LOD Reporting

• Uplink Reporting: Maps to:
• Media-Aware Application (TS 26.501) and Split Rendering Client (TS 26.565) for pose/LOD capture
• Real-time/conversational service interfaces (TS 26.506) for transfer of pose and LOD information to generate view/LOD dependent 3DGS content

5G QoS Considerations (NOTE 1)

The CR identifies key 5G QoS requirements for 3DGS service delivery (marked as FFS for final determination):

Performance Requirements

• High bit rates/bandwidth/throughput: Leveraging 3GPP eMBB
• Low to Ultra Low Latencies: Utilizing 5G URLLC
• Low jitter delivery

XR-Specific QoS Features

• New 5QI for XR services
• PDU Set based QoS with parameters:
• PDU Set Error Rate
• PDU Set Delay Budget
• PDU Set Size
• Alternative QoS Profiles

Network Architecture Features

• Service Stability: Using 5G Network Slicing (e.g., dedicated network slice for 3DGS delivery) per TS 23.501
• Edge Computing: Caching with edge CDNs and network processing (generation, rendering) per TS 26.501 and TS 23.558
• Multicast/Broadcast: Distribution to multiple users per TS 26.502

Additional Considerations (NOTE 2)

For Avatar-related 3DGS services, TS 26.264 may be applicable.

Impact

This CR completes the study on mapping 3DGS to 3GPP services by addressing the Client-Server configuration, which is essential for network-assisted 3DGS delivery scenarios including edge rendering and adaptive streaming use cases.