S4-260099 - AI Summary

Draft Reply LS on traffic model for immersive communication

Back to Agenda Download Summary
AI-Generated Summary AI

LS on Traffic Model for Immersive Communication

Document Information

  • Source: Huawei Hisilicon (SA WG4 to be)
  • To: RAN WG1
  • Response to: R1-2509596/S4-260013
  • Release: Rel-20
  • Work Item: FS_6G_MED

Overall Description

SA4 provides a response to RAN1's LS regarding traffic models for immersive communications, drawing on previous study work and ongoing investigations.

Main Technical Contributions

Historical Context from 5G Studies

TR 26.955 - 5G Video Codec Study

  • Immersive Gaming Scenarios (Clause 7.3.3):
  • Evaluated rate points between 20 Mbit to 100 Mbit for highest quality sequences
  • Target scenario: 4K + HDR at 120 fps

  • No values above 100 Mbit reported in the study

  • Frame Rate Considerations (Table 6.6.3.7-1):

  • Frame rates of 90 fps and 120 fps considered for online gaming

  • Aligns with proposed model updates from RAN1

  • Industry Deployment Reference:

  • Current gaming services (e.g., GeForce Now) require approximately 50 Mbit+

  • 5G Uplink Limitations:

  • High quality uplink scenario (4K + HDR) was not considered due to limited uplink bandwidth
  • SA4 developed coding profiles for downlink applications (5G media streaming, immersive gaming)

Uplink Scenario Considerations

Real-Time Uplink Characteristics

  • Encoder Constraints:
  • Uplink encoders (sender side) typically less powerful than downlink

  • Expected values in the higher range of 20-100 Mbit for transparent quality

  • Adaptive Mechanisms:

  • Temporary frame rate drops and/or quality switches may compensate for encoder limitations

  • Could still result in comparable bit-rates

  • Traffic Variability:

  • Frame rate changes more likely compared to traditional downlink cases
  • Bit-rates in 20-100 Mbit range assumed for transparent quality

3D and Immersive Formats

TR 26.956 - Emerging 3D Formats

  • Clause 9 Results:

  • Explored formats beyond traditional 2D video:

    • Video-based point cloud
    • Multi-view stereo with depth
    • Immersive video

  • Bit-rate Range:

  • Transparent quality results roughly in 20-100 Mbit range

  • Matches RAN WG1 assumptions

  • Frame Rate Limitation:

  • Only lower frame rates tested: 25-30 fps

Ongoing Studies

  • Gaussian Splat-Based Imaging:
  • Currently under study in SA4
  • Could result in:
    • Different frame rates
    • Potentially (much) larger bit-rates

Future Work in FS_6G_MED

  • Study just started in SA4
  • Uplink video scenario not yet studied
  • Expected investigation areas:
  • High quality uplink cases based on SA WG1 use cases
  • Derivation of corresponding requirements for uplink video
  • Building on earlier 5G downlink results

Actions

To RAN WG1:

SA4 respectfully requests RAN WG1 to take this information into account.

Key Technical Takeaways

  1. Bit-rate Range Alignment: SA4's previous studies support the 20-100 Mbit range proposed by RAN1 for immersive communications
  2. Uplink-Downlink Asymmetry: Uplink scenarios expected to require higher bit-rates within the range due to encoder constraints
  3. Format Evolution: Emerging 3D formats (point clouds, Gaussian splats) may require significantly higher bit-rates than traditional 2D video
  4. Frame Rate Considerations: High frame rates (90-120 fps) already considered in 5G studies, with adaptive mechanisms expected in uplink scenarios
Document Information
TDoc:
S4-260099
Source:
Huawei Tech.(UK) Co.. Ltd
Type:
LS out
For:
Approval
Original Document:
View on 3GPP
Title: Draft Reply LS on traffic model for immersive communication
Agenda item: 5.2
Agenda item description: Other 3GPP groups
Doc type: LS out
For action: Approval
Release: Rel-20
Related WIs: FS_6G_MED
Reply to: RAN WG1
Original LS: R1-2509596
Cc: SA
To: RAN WG1
Contact: Rufail Mekuria
Uploaded: 2026-02-03T09:43:18.620000
Contact ID: 104180
Revised to: S4-260451, S4-260453
TDoc Status: merged
Reservation date: 02/02/2026 14:30:50
Agenda item sort order: 7