TID-to-UP Mapping for Low-Latency Wi-Fi Traffic Differentiation

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Solution Overview

Problem

Existing IEEE 802.11 protocols face constraints in TID to UP mapping that impact low latency traffic operations, leading to potential adverse effects on low latency performance when latency sensitive and regular traffic share the same TID/UP.

Innovation Solution

Implementing a mechanism where a STA can request TID-to-UP mapping on another STA, allowing multiple TIDs to be mapped to the same AC, and utilizing DSCP ranges to differentiate traffic streams, even when TIDs and UPs have different values.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If multiple TIDs are mapped to the same UP using existing 802.11 protocols, then device complexity is reduced, but low latency traffic performance deteriorates due to inability to differentiate traffic streams

Engineering Contradiction:

ImproveTID to UP mapping complexityVSAvoidlow latency traffic performance

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The patent segments the TID space by introducing a separate TSID field to distinguish traffic stream identifiers from regular TIDs. This allows the system to handle multiple TIDs mapping to the same UP while maintaining differentiation capability for low latency traffic through the TSID parameter, thus resolving the contradiction between simplified mapping and performance preservation.

Inventive Principle:

Principle #1Segmentation

2Adaptability or versatility

If TID values are reused for both regular traffic and traffic streams, then TID resource utilization is improved, but traffic differentiation capability deteriorates

Engineering Contradiction:

ImproveTID utilization flexibilityVSAvoidtraffic stream identification information

Core Design Contradiction:

Adaptability or versatilityVSLoss of information

Solution Approach 1:

The patent introduces TSID as an intermediary parameter that bridges the gap between TID and traffic stream identification. When TIDs are reused for different traffic streams, the TSID field preserves the unique identification information, allowing the receiver to correctly differentiate traffic streams even when TIDs are not unique, thus maintaining both flexibility and information integrity.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Stability of the object's composition

If existing TID-to-UP mapping is used without enhancements, then protocol compatibility is maintained, but channel contention performance for low latency traffic deteriorates

Engineering Contradiction:

Improveprotocol compatibilityVSAvoidchannel contention performance

Core Design Contradiction:

Stability of the object's compositionVSProductivity

Solution Approach 1:

The patent implements dynamic TID-to-UP mapping where the mapping relationship can be customized per traffic stream through the TSID parameter. This allows the system to maintain standard protocol compatibility while dynamically optimizing channel contention performance for low latency traffic by assigning appropriate UP values based on traffic stream requirements, thus resolving the contradiction between stability and productivity.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS12598506B2Transmit identifier to user priority / AC mapping

Publication Date: 2026.04.07 SONY GROUP CORP

AI summary

Enhanced TID-to-UP mapping is performed which allows multiple TIDs to be mapped to the UPs of the same AC. Thus, a first STA can set TID-to-UP mapping for a second STA, whereby TID-to-UP mapping can differentiate the MSDUs or A-MSDUs that are transmitted. In addition, an MSDU/A-MSDU can be classified by TID first, then use TID-to-UP mapping to map it to the corresponding UP. In addition, an SCS traffic stream can assign a TID and a UP to that SCS traffic stream. The use of these enhanced mechanism can enhance low latency performance.