S4-260162 - AI Summary

Reply LS on traffic model for immersive communication

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Reply LS on Traffic Model for Immersive Communication

Document Information

  • Source: SA WG4
  • To: RAN WG1
  • Response to: R1-2509596
  • Release: Release 20
  • Work Item: FS_6G_Radio

Overall Description

SA4 has discussed RAN1 LS R1-2509596 and provides information on the eXR model with Haptics.

Key Modeling Principles

SA4 establishes the following principles for haptics traffic modeling:

  1. Simultaneous haptics packets over multiple channels can be modeled as one aggregated packet
  2. Silent periods of haptics do not need to be modeled
  3. Haptics packets and XR traffic packets can be generated either independently or with correlation

Downlink Haptics Traffic Model

SA4 provides a statistical parametric model for downlink haptics traffic based on haptics traces (provided in attachment).

Statistical Parameters

| Parameter | Unit | Value/Distribution |
|-----------|------|-------------------|
| Packet size | byte | Pareto distribution with α=7, range = [504, 1736] bits
CDF: F(x) = 1 - (x_min/x)^α, where x_min is the minimum value |
| Packet inter-arrival time (T) | ms | Exponential distribution with λ=0.015, min=M
Quantized to multiples of M using rounding function (e.g., M=32ms)
CDF: F(t) = 1 - e^(-λt) |
| Jitter | ms | Follows description in clause 5.1.1.2 in TR 38.838 |
| PDB | ms | 30 |
| Packet Success Rate | % | 90 |

Key Characteristics

  • Packet sizes follow a Pareto distribution (heavy-tailed distribution) with shape parameter α=7
  • Inter-arrival times follow an exponential distribution with rate parameter λ=0.015, subsequently quantized to multiples of M (e.g., 32ms)
  • 30ms PDB requirement with 90% packet success rate

Uplink Haptics Traffic Model

For uplink haptics traffic, SA4 recommends reusing existing models:

  • Uplink haptics mainly involves transmission of haptic sensor information
  • The uplink control or pose traffic model defined in section 5.2 of TR 38.838 can be reused

Action Requested

SA4 respectfully requests RAN1 to take the above information into account for traffic modeling in immersive communication studies.

Document Information
TDoc:
S4-260162
Source:
vivo Mobile Communication Co.,
Type:
LS out
For:
Agreement
Original Document:
View on 3GPP
Title: Reply LS on traffic model for immersive communication
Agenda item: 5.2
Agenda item description: Other 3GPP groups
Doc type: LS out
For action: Agreement
Abstract: SA4 has discussed the RAN1 LS R1-2509596 and would like to provide the following information on eXR model with Haptics. - Simultaneous haptics packets over multiple channels can be modelled as one aggregated packet. - Silent periods of haptics do not need to be modelled. - Haptics packets and XR traffic packets can be generated either independently or with correlation.
Release: Rel-20
To: R1-2509596
Contact: Wang Dong
Uploaded: 2026-02-03T13:43:09.983000
Contact ID: 107237
TDoc Status: revised
Reservation date: 03/02/2026 12:50:36
Agenda item sort order: 7