Multi-AP Channel Coordination for Interference-Aware Bandwidth Sharing
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Solution Overview
Problem
Existing wireless networks experience performance degradation due to inter-access point contention and interference when multiple access points in proximity select overlapping channels, leading to reduced broadcast efficiency and throughput.
Innovation Solution
Access points coordinate with each other to determine and share wider channels, allocate bandwidth cooperatively, and manage network traffic by assigning Resource Units (RUs) among clients, using a central controller or ad-hoc network architecture to minimize channel overlap and optimize data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If multiple access points select channels independently using automatic channel selection, then each access point can operate autonomously, but channel overlap occurs causing inter-access point contention and interference
Solution Approach 1:
The patent introduces a coordinator access point that acts as an intermediary to manage channel assignments among multiple access points. The coordinator receives channel assignment requests from non-coordinator APs, determines optimal channels considering overlapping service sets, and assigns channels to minimize interference. This mediator approach resolves the contradiction by maintaining autonomous operation for individual APs while ensuring coordinated channel selection to prevent contention and interference.
2Productivity
If access points use wider channels to increase bandwidth, then data transmission capacity improves, but channel overlap and interference between access points increases
Solution Approach 1:
The patent applies local quality by allowing different access points to use different channel widths based on their specific locations and overlapping service set relationships. The coordinator evaluates each AP's position and determines whether wider channels (40MHz, 80MHz) or narrower channels (20MHz) are appropriate for each location, optimizing bandwidth utilization while minimizing interference in each local area.
Solution Approach 2:
The system dynamically changes the channel width parameter (20MHz, 40MHz, 80MHz) based on the specific deployment scenario and interference conditions. The coordinator can assign different channel widths to different APs or adjust them over time based on network conditions, allowing the system to adapt to varying requirements for bandwidth versus interference avoidance.
3Reliability
If access points use non-overlapping 20 MHz channels to avoid interference, then channel contention is reduced, but available bandwidth and throughput are limited
Solution Approach 1:
The patent implements dynamic channel assignment where the coordinator can allocate different channel widths (20MHz, 40MHz, 80MHz) based on real-time network conditions, client requirements, and interference levels. This dynamic approach allows the system to transition between conservative non-overlapping assignments and more aggressive overlapping assignments with wider channels, optimizing throughput while maintaining contention reduction where necessary.
Data Source
AI summary
Systems and methods for operating an access point in a wireless network so as to reduce congestion. The access point may have a transmitter capable of broadcasting a beacon indicating a channel over which the access point propagates wireless data. The channel broadcast by the access point may be optimized for future cooperative use of the channel with a second access point.