Low Latency Access Category for WLAN Traffic Prioritization
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Solution Overview
Problem
Current wireless local area network (WLAN) systems face challenges in transmitting low-latency traffic efficiently, as existing access categories do not prioritize latency-sensitive traffic adequately, leading to delays in real-time audio/video transmissions and increased competition in the industrial scientific medical (ISM) band.
Innovation Solution
A new access category for low latency is introduced, allowing stations (STAs) to transmit low-latency queue activation signals and receive approval from access points (APs), enabling prioritization and resource allocation for latency-sensitive traffic, separate from existing EDCA queues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If existing access categories are used for traffic transmission, then general WLAN communication is maintained, but latency-sensitive traffic experiences delays and cannot be prioritized
Solution Approach 1:
The patent segments the WLAN traffic handling by introducing a separate low-latency queue (queue 0) distinct from the existing four EDCA queues (queues 1-4). This segmentation allows latency-sensitive traffic to be handled independently with dedicated resource allocation, while non-latency-sensitive traffic continues to use the existing queue structure, thus resolving the contradiction between maintaining general WLAN compatibility and enabling traffic prioritization.
Solution Approach 2:
The patent applies local quality by assigning different transmission characteristics to different queues. Specifically, the low-latency queue (queue 0) is configured with shorter interframe spaces (SIFS instead of AIFS), allowing it to transmit frames more quickly than other queues. This localized optimization of transmission parameters for specific traffic types enables latency prioritization without affecting the overall WLAN system operation.
2Speed
If a new low-latency queue is introduced for prioritized traffic, then latency-sensitive traffic transmission speed is improved, but system complexity increases due to additional queue management
Solution Approach 1:
The patent extracts the low-latency traffic handling function from the general EDCA queue management system by creating a separate queue 0 with dedicated resource allocation. The access point maintains separate resource allocation information for queue 0 versus queues 1-4, and stations independently manage their low-latency traffic in this separate queue. This extraction reduces the complexity burden on individual devices while achieving prioritized transmission through centralized resource allocation management.
3Reliability
If resources are allocated separately for low-latency traffic, then latency-critical transmission is guaranteed, but resource allocation complexity and negotiation overhead increase
Solution Approach 1:
The patent implements preliminary action by having the access point pre-allocate resources for the low-latency queue before traffic arrives. The access point maintains resource allocation information specifically for queue 0, determining in advance which resource units will be assigned to low-latency traffic. This preliminary resource reservation ensures that when latency-sensitive traffic arrives, resources are already prepared and allocated, providing reliability guarantees without requiring complex real-time negotiation during transmission.
Data Source
AI summary
In a wireless local area network system, a station (STA) may transmit a low latency queue activation signal. The STA may receive a low latency queue activation approval signal. The present invention may comprise a step for transmitting data by the STA via a low latency queue.