TXOP Preemption Sub-Window Structuring for Low-Latency Traffic
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Solution Overview
Problem
Wireless technologies face challenges in reducing latency for stations (STAs) with high-priority traffic due to exclusive channel access by a STA holding a transmission opportunity (TXOP), leading to delays in event-triggered data transmission.
Innovation Solution
Implementing mechanisms for dynamic structuring of TXOP preemption opportunities (POs) by defining sub-windows with traffic priority values, configuring POs with sub-windows, bands, and inter-frame spaces, and dynamically adjusting based on notifications and collisions to allow efficient channel access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a STA holds a TXOP with exclusive channel access, then channel access reliability for the holding STA is improved, but latency for high-priority event-triggered traffic from other STAs increases
Solution Approach 1:
The TXOP is segmented into multiple sub-windows, each with different access rules. High-priority STAs can access specific sub-windows even when a STA holds the overall TXOP, while the holding STA maintains access to other sub-windows. This segmentation allows simultaneous guarantee of channel access reliability for the TXOP holder and low latency for high-priority event-triggered traffic.
2Productivity
If a STA holds a TXOP for an extended period, then productivity for the holding STA is improved, but adaptability to dynamic traffic priorities deteriorates
Solution Approach 1:
The system dynamically adjusts channel access parameters within the TXOP based on real-time traffic conditions. The AP can modify sub-window structures, access priorities, and timing parameters during the TXOP duration to adapt to changing traffic demands, maintaining both high productivity and adaptability.
Solution Approach 2:
The system changes operational parameters such as sub-window durations, inter-sub-window spacing, and access priorities based on traffic conditions. By dynamically adjusting these parameters, the system maintains high throughput for the TXOP holder while accommodating high-priority event-triggered traffic when needed.
3Adaptability or versatility
If the AP dynamically configures PO parameters based on traffic conditions, then adaptability to traffic demands is improved, but device complexity increases
Solution Approach 1:
The system employs self-service mechanisms where STAs autonomously determine their access behavior based on pre-configured rules and current traffic conditions. The AP establishes the dynamic configuration framework, but individual STAs independently make access decisions, reducing the computational burden on the AP and overall system complexity.
Data Source
AI summary
Embodiments described herein may include: (i) determining, based on receiving one or more notifications about event-triggered traffic in a sub-window of a preemption opportunity (PO), that a threshold quantity of transmissions is available to be scheduled in a transmission period; (ii) terminating, based on the threshold being met or exceeded, the PO; (iii) structuring, based on at least one of a number, type, or amount of traffic buffered by stations (STAs), the PO via an initial actions (IA) frame at a beginning of the PO; (iv) transmitting, based on detecting one or more collisions in the sub-window, a frame informing one or more stations (STAs) about one or more new sub-windows and their corresponding structures; and (v) transmitting, based on a second threshold quantity of notifications about event-triggered traffic being received, a trigger frame (TF) prior to an end of the sub-window.