Low-Latency Preemption Mode for Wireless Communications
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently transmitting low-latency traffic due to potential issues like STA preempting other STAs' TXOP without allowing preemption, and complex implementation of 3rd-party STA preemption.
Innovation Solution
A wireless device and communication system that enables a low-latency preemption mode, allowing TXOP responders and/or 3rd-party devices to preempt TXOP holders during non-low-latency access categories, with specific rules for transmitting preemption requests based on indications in management frames and PPDU headers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If low-latency preemption is allowed in a TXOP holder's transmission opportunity, then latency of low-latency traffic is reduced, but the risk of unauthorized preemption by stations that do not allow preemption in their own TXOP increases
Solution Approach 1:
The patent implements a feedback mechanism where the TXOP holder announces preemption enablement status to all stations, and stations provide feedback by checking this status before initiating preemption. The receiving station verifies whether the transmitting station allows preemption in its TXOP before allowing the preemption to proceed, creating a closed-loop control system that prevents unauthorized preemption while maintaining low-latency capability.
2Adaptability or versatility
If preemption by 3rd-party stations is implemented, then low-latency traffic from any station can be transmitted, but the implementation complexity increases
Solution Approach 1:
The patent introduces an intermediary verification mechanism where the receiving station acts as a mediator to check whether the transmitting station allows preemption in its TXOP. This intermediary check simplifies the overall system by centralizing the authorization logic at the receiving end, rather than requiring complex coordination between multiple 3rd-party stations and the TXOP holder, thus enabling versatile preemption while controlling implementation complexity.
3Loss of time
If preemption requests are transmitted immediately upon detecting low-latency traffic, then latency is reduced, but the risk of transmitting during inappropriate times increases
Solution Approach 1:
The patent implements preliminary action by having stations pre-announce their preemption enablement status in their management frames before any preemption occurs. This allows receiving stations to verify authorization in advance before transmitting preemption requests, ensuring that preemption only happens at appropriate times when authorized, thus maintaining both low latency and high reliability through advance preparation.
Data Source
AI summary
Embodiments of a wireless device, a communications system and method are disclosed. In an embodiment, a wireless device comprises a wireless transceiver to receive and transmit frames, and a controller operably coupled to the wireless transceiver to process the frames, wherein the controller is configured to, in response to an enablement of a low-latency preemption mode from another wireless device, transmit a request for a low-latency preemption, and then transmit a low-latency frame to the another wireless device.