Wireless LAN TXOP Segmentation for Low-Latency Traffic
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Solution Overview
Problem
Existing wireless communication systems face challenges in handling low latency traffic due to channel occupancy by high throughput transmissions, leading to dropped low latency traffic and inefficient frequency utilization.
Innovation Solution
Implementing dedicated resources within a transmission opportunity (TXOP) for low latency traffic, including frequency and time slots, and utilizing preemption procedures to manage low latency traffic without overlapping with high throughput traffic.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high throughput transmission occupies the channel for long duration, then throughput is improved, but low latency traffic cannot be transmitted timely
Solution Approach 1:
The patent segments the transmission opportunity (TXOP) into multiple sub-TXOPs, allowing different traffic types to be handled in different time segments. Low latency traffic can be transmitted in dedicated sub-TXOPs while high throughput traffic uses other segments, resolving the conflict between throughput and latency requirements
Solution Approach 2:
The patent implements preliminary action by allowing stations to indicate the presence of low latency traffic before the main transmission begins. This early indication enables the access point to prioritize and handle low latency traffic first, preventing delay expiration before the transmission opportunity is fully utilized
2Loss of time
If dedicated resources are allocated for low latency traffic, then latency is reduced, but frequency usage efficiency decreases
Solution Approach 1:
The patent implements dynamic resource allocation where dedicated resources for low latency traffic are allocated only when needed. Stations can dynamically indicate the presence of low latency traffic, and the system adapts by creating dedicated sub-TXOPs only when such traffic is detected, otherwise using the channel for high throughput transmissions
Solution Approach 2:
The patent applies local quality by providing different transmission qualities to different traffic types within the same channel. Low latency traffic receives prioritized handling with dedicated sub-TXOPs and shorter durations, while other traffic可以利用 the full channel capacity, optimizing overall system performance
3Loss of time
If low latency traffic is prioritized, then latency is reduced, but device complexity increases
Solution Approach 1:
The patent uses universal mechanisms that serve multiple functions. The indication message mechanism not only signals low latency traffic presence but also enables dynamic resource allocation. The sub-TXOP structure serves both low latency traffic transmission and maintains compatibility with existing high throughput transmissions, reducing the need for entirely new protocols
Data Source
AI summary
An electronic apparatus receives a resource allocation message allocating a dedicated resource for a control message for low latency traffic from an access point. The electronic apparatus transmits an indication message indicating existence of low latency traffic on the dedicated resource to the access point. The electronic apparatus receives a trigger frame eliciting the low latency traffic from the access point, and transmits the low latency traffic to the access point.