Wireless Access Point Radar Detection Coordination
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Solution Overview
Problem
Wireless access points face challenges in efficiently performing Dynamic Frequency Selection (DFS) due to high false detection rates and the time-consuming nature of Channel Availability Checks (CACs) and In-Service Monitoring (ISM), particularly in shared frequency bands like 5GHz, which can lead to interference with radar systems.
Innovation Solution
A method and apparatus where wireless access points share detection information about radar signals, adjusting detection thresholds based on neighboring access points' data to improve detection accuracy and reduce false positives, allowing for dynamic channel selection and switching between frequency bands to avoid radar interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wireless access points perform ongoing In-Service Monitoring to detect radar signals, then radar detection capability is improved, but false detection rates increase and system complexity increases
Solution Approach 1:
The patent combines radar detection resources across multiple wireless access points by having them share detection information through a coordinator. Instead of each AP independently performing In-Service Monitoring, they pool their detection capabilities, which improves overall radar detection reliability while reducing false detection rates through collective analysis and cross-validation of detected signals.
Solution Approach 2:
The patent introduces a coordinator AP as an intermediary that collects, processes, and distributes radar detection information among multiple access points. This mediator consolidates detection data from multiple sources, applies centralized detection algorithms, and coordinates channel selection decisions, thereby improving detection accuracy while reducing the complexity burden on individual APs.
2Object-affected harmful factors
If wireless access points perform Channel Availability Check before using DFS channels, then interference with radar systems is reduced, but channel selection time increases
Solution Approach 1:
The patent performs Channel Availability Check in advance before wireless communication begins on DFS channels. By conducting this preliminary radar detection and channel validation before service initiation, the system ensures that channels are clear of radar signals, thereby preventing interference while establishing a known-safe operating state before time-sensitive communication begins.
Solution Approach 2:
The patent combines Channel Availability Check operations across multiple access points, allowing them to share detection results and coordinate channel selection. This collective approach reduces the total time required for channel selection by avoiding redundant detection efforts on the same channels, while still ensuring comprehensive radar interference prevention through multiple observation points.
3Reliability
If wireless access points perform ongoing In-Service Monitoring, then radar signal detection is improved, but processing complexity and energy consumption increase
Solution Approach 1:
The patent segments the radar detection and processing functions by designating one access point as a coordinator that performs the complex In-Service Monitoring and signal analysis, while other access points perform simpler local detections and report results to the coordinator. This segmentation reduces the processing complexity burden on each individual AP while maintaining comprehensive radar detection capability through the coordinated system.
4Ease of operation
If wireless access points use fixed detection thresholds for radar signals, then detection simplicity is maintained, but false detection rates increase
Solution Approach 1:
The patent implements dynamic detection thresholds that are adjusted based on environmental conditions, historical detection data, and coordination information from other access points. The coordinator AP analyzes collected detection information and adapts thresholds to distinguish true radar signals from false detections more effectively, thereby reducing false detection rates while maintaining operational simplicity through automated adaptation.
Solution Approach 2:
The patent incorporates feedback mechanisms where detection results from multiple access points are fed back to the coordinator, which then adjusts detection parameters and thresholds based on the collective experience and observed signal patterns. This feedback loop continuously improves detection accuracy and reduces false positives while maintaining ease of operation through automated parameter optimization.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces false radar detection rates and enhances true detection reliability, improving WiFi channel selection and reducing unnecessary channel changes, thereby optimizing wireless communication performance.
Implementation Method 1
each having a radar detector operable to detect possible radar signals received by the access point within said predetermined frequency range
Data Source
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AI summary
Methods and apparatus are disclosed for controlling wireless communication between a first wireless access point and one or more user devices, the first access point having an interface for communication with the user devices on one or more wireless communication channels in a predetermined frequency range, and also being configured to communicate with one or more other wireless access points. The access points each have a radar detector operable to detect possible radar signals within the frequency range, and are configured to provide information indicative of whether or not possible radar signals have been detected. The first access point receives communications relating to information provided by the other access points, and starts or stops wireless communications with its user devices on a particular channel based on whether or not it has detected possible radar signals together with whether or not the other wireless access points have detected possible radar signals.