Dynamic TXOP Preemption Structure for Low-Latency Event Traffic
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Solution Overview
Problem
Wireless technologies face challenges in reducing latency for stations (STAs) with event-triggered data exchange, as exclusive channel access by a STA can lead to delays in transmitting high-priority traffic for other STAs.
Innovation Solution
Mechanisms for dynamically structuring transmission opportunity preemption opportunities (TXOPs) by defining sub-windows with traffic priority values, configuring parameters like sub-windows, bands, and inter-frame spaces, and adjusting based on notifications and collisions to allow efficient channel access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a STA holds a transmission opportunity (TXOP) with exclusive channel access, then transmission reliability for the holding STA is improved, but latency for other STAs with event-triggered traffic increases
Solution Approach 1:
The TXOP is segmented into multiple sub-windows, each dedicated to specific priority levels. High-priority event-triggered traffic is allocated specific sub-windows where it can transmit without being blocked by lower-priority traffic, thus reducing latency while maintaining reliable transmission for all priority levels
Solution Approach 2:
Different sub-windows within the TXOP are assigned different quality characteristics based on traffic priority. High-priority traffic receives guaranteed access in its designated sub-windows, while lower-priority traffic operates in other sub-windows, creating local quality variations that resolve the contradiction between reliability and latency
2Productivity
If the TXOP duration is extended to accommodate more transmissions, then productivity of the channel is improved, but latency for high-priority event-triggered traffic increases
Solution Approach 1:
The extended TXOP is divided into multiple sub-windows with different priority assignments. This segmentation allows the channel to maintain high productivity over the extended period while ensuring that high-priority traffic experiences low latency by being confined to specific early sub-windows
Solution Approach 2:
The TXOP structure creates periodic opportunities for high-priority traffic within the extended transmission period. High-priority traffic can access the channel at regular intervals defined by the sub-window structure, maintaining low latency even as the overall TXOP duration increases to improve productivity
3Ease of operation
If the TXOP structure is made rigid to simplify management, then ease of operation is improved, but adaptability to varying traffic conditions decreases
Solution Approach 1:
The TXOP structure incorporates dynamic elements where the AP can adjust sub-window configurations, durations, and priority assignments based on real-time traffic conditions. This dynamic adaptability allows the system to respond to varying traffic patterns while maintaining a structured framework that simplifies overall management
Solution Approach 2:
The sub-window structure serves multiple functions simultaneously: it provides structured resource allocation, enables priority-based access, allows dynamic reconfiguration, and maintains simple AP-controlled management. This multi-functionality resolves the contradiction between operational simplicity and adaptability
Data Source
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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.