WLAN Access Point Radar Detection Coordination
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Solution Overview
Problem
In wireless local area networks (WLANs), false detections of radar events occur, and some access points may not detect radar events, leading to potential interference with radar systems and network downtime, as they continue operating on the same channel despite nearby APs detecting the signals.
Innovation Solution
Implementing Dynamic Frequency Selection (DFS) enabled access points that monitor for radar pulses, maintain a non-occupancy list, and proactively switch channels to avoid interference, using convex hull calculations to identify APs that should have detected radar signals and guide client devices to associate with different APs, ensuring compliance with IEEE 802.11 standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If access points continue operating on the same channel after failing to detect radar events, then network continuity is maintained, but radar interference occurs and compliance with regulatory standards deteriorates
Solution Approach 1:
The patent implements a feedback mechanism where access points share radar detection information with neighboring APs. When one AP detects radar events, this information is communicated to other APs operating on the same channel, enabling them to switch channels proactively. This feedback loop ensures regulatory compliance while maintaining network productivity by coordinating channel switching across the network.
Solution Approach 2:
The patent enables access points to proactively switch channels based on radar detection information from neighboring APs before interference occurs. By acting on preliminary detection data from the network, APs can switch channels in advance, preventing radar interference and maintaining compliance without causing network downtime.
2Reliability
If access points switch channels frequently to avoid radar interference, then compliance with regulatory standards is improved, but network stability and client connectivity deteriorate
Solution Approach 1:
The feedback mechanism allows APs to coordinate channel switching decisions. When radar events are detected, the information is shared with neighboring APs, enabling synchronized channel switching. This coordination reduces unnecessary frequent switching and maintains network stability while ensuring compliance with regulatory standards.
3Device complexity
If access points operate independently without sharing radar detection information, then device complexity is reduced, but false detections and missed radar events increase
Solution Approach 1:
The patent introduces an intermediary information sharing mechanism where radar detection data is communicated between neighboring access points. This intermediary approach allows APs to benefit from collective radar detection information without requiring complex centralized control, improving detection accuracy while maintaining operational simplicity.
Data Source
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AI summary
Example method includes: receiving, by a network device, a plurality of notifications from a plurality of access points in a wireless local area network (WLAN), each notification indicating detection of a particular radar event on a particular wireless communication channel; identifying, by the network device, at least one access point operating on the particular wireless communication channel beside the plurality of access points that fails to detect the particular radar event; and transmitting, by the network device, instructions to the at least one access point, wherein the instructions cause the at least one access point to switch to operate on a different wireless communication channel.