TXOP Preemption Windows for Low-Latency Channel Access
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Solution Overview
Problem
Existing wireless technologies face challenges in reducing latency for stations (STAs) that require low latency data exchange, particularly in managing transmission opportunities (TXOPs) and preemption opportunities (POs).
Innovation Solution
Implementing methods and apparatuses to dynamically adjust parameters of POs, such as structuring them into sub-windows and timeslots, and allowing preemption-eligible STAs (PESs) to contend and preempt TXOPs based on signaling, with adjustments made based on collision intensity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If transmission opportunities (TXOPs) are allocated to stations for data transmission, then channel utilization and throughput are improved, but latency for high-priority traffic increases due to lack of preemption capability
Solution Approach 1:
The patent implements dynamic TXOP preemption by allowing high-priority stations to preempt ongoing TXOPs of lower-priority stations when collision intensity exceeds a threshold. This dynamic adjustment enables the system to adapt channel access rights in real-time based on traffic priority and collision conditions, resolving the contradiction between maintaining channel utilization and reducing latency for high-priority traffic.
Solution Approach 2:
The system changes the parameter of TXOP allocation by introducing preemption eligibility based on collision intensity thresholds. When the threshold is exceeded, the system parameter (TXOP holder status) is dynamically changed to allow preemption, thereby reducing latency for high-priority traffic while maintaining overall channel utilization through controlled preemption opportunities.
2Productivity
If preemption opportunities (POs) are structured into multiple sub-windows and timeslots, then channel access efficiency for high-priority traffic is improved, but system complexity increases
Solution Approach 1:
The patent segments the preemption opportunity window into multiple sub-windows and further divides them into timeslots. This segmentation allows high-priority stations to access the channel in organized time intervals, improving channel access efficiency by reducing contention collisions while maintaining manageable system complexity through structured time division.
Solution Approach 2:
The system introduces an additional time dimension by creating hierarchical time slots within preemption opportunities. This multi-level time structure (PO window → sub-windows → timeslots) provides finer-grained channel access control, improving efficiency without proportionally increasing complexity through the use of standardized time division multiplexing concepts.
3Adaptability or versatility
If dynamic adjustment of PO parameters is implemented based on collision intensity, then adaptability to varying traffic conditions is improved, but control and measurement complexity increases
Solution Approach 1:
The patent implements feedback-based dynamic adjustment where the TXOP holder monitors collision intensity and adjusts preemption opportunity parameters accordingly. When collision intensity exceeds a threshold, the system activates preemption; when it falls below, preemption is deactivated. This feedback mechanism provides adaptability to varying traffic conditions while keeping control complexity manageable through simple threshold-based decision logic.
Solution Approach 2:
The system enables self-service dynamic adjustment where the TXOP holder autonomously monitors collision intensity and adjusts PO parameters without external intervention. This self-adjusting mechanism improves adaptability to traffic conditions while minimizing control complexity by distributing the control function to the station currently holding the TXOP.
Data Source
AI summary
Methods and apparatuses are disclosed for determining stations (STAs) allowed to contend and/or preempt transmission opportunities (TXOPs), for structuring preemption opportunities (POs) into sub-windows and/or timeslots, and/or for dynamically adjusting parameters of POs.