Multi-Channel DFS Radar Detection in Mesh Networks
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Solution Overview
Problem
Current Wi-Fi and LTE-U networks face congestion and unreliable connections due to inefficient management of unlicensed spectrum, particularly in the 5 GHz U-NII-2 band, where devices require radar detection and channel availability checks, leading to loss of bandwidth and network downtime due to false radar detections.
Innovation Solution
A wireless agility agent employing multi-channel radar detection and in-service monitoring, along with a cloud-based intelligence engine, to continuously analyze and manage radar signals across multiple channels, reducing false detections and optimizing channel usage through a split-intelligence architecture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If DFS channels are used to expand bandwidth, then additional bandwidth is available for Wi-Fi and LTE-U networks, but false radar detections cause network downtime and loss of bandwidth
Solution Approach 1:
The patent divides the DFS channel management into multiple independent radio units, each capable of monitoring different channels simultaneously. This segmentation allows the system to maintain multiple channels in service rather than shutting down entire networks due to false radar detections on single channels, thereby preserving both bandwidth and reliability.
Solution Approach 2:
The patent changes the operational parameters by enabling simultaneous monitoring of multiple DFS channels across different radio units. Instead of sequentially checking channels or shutting down upon detecting potential radar, the system continuously monitors multiple channels with multiple radios, dynamically adjusting channel availability based on actual radar presence rather than false detections, thus maintaining bandwidth while improving reliability.
2Device complexity
If single radio DFS master detection is used, then device complexity is reduced, but bandwidth utilization is limited due to sequential channel checking
Solution Approach 1:
The patent combines multiple radio units into a coordinated DFS master system where each radio independently monitors specific channels. This merging of multiple simple radio units creates a powerful multi-channel monitoring capability without requiring a single complex radio, thus maintaining low device complexity while achieving high bandwidth utilization through parallel channel monitoring.
Solution Approach 2:
The patent makes each radio unit universal by enabling them to monitor different DFS channels simultaneously according to their assigned frequency ranges. This multi-functionality allows the system to utilize the full DFS spectrum bandwidth while keeping individual radio units relatively simple, resolving the contradiction between complexity and bandwidth utilization.
3Device complexity
If channel availability check is performed sequentially, then device complexity is minimized, but network downtime increases due to 60-second check duration per channel
Solution Approach 1:
The patent implements periodic monitoring where multiple radios continuously check their assigned DFS channels at regular intervals rather than performing sequential 60-second checks. This periodic parallel monitoring dramatically reduces the time to detect radar presence or false detections, minimizing network downtime while keeping the monitoring system relatively simple through standardized periodic operations.
Solution Approach 2:
The patent performs preliminary channel availability checks in parallel across multiple radios before network operations begin. By pre-establishing channel availability status through simultaneous monitoring, the system avoids time-consuming sequential checks during operation, reducing network downtime while maintaining manageable system complexity through automated preliminary assessment.
4Loss of information
If DFS beacons are transmitted on all channels, then channel availability information is provided to clients, but spectrum congestion increases in unlicensed bands
Solution Approach 1:
The patent applies local quality by having DFS masters transmit beacons only on specific DFS channels within their assigned frequency ranges rather than all channels universally. Each radio unit monitors and beacons on its designated channels, providing localized channel availability information to clients while reducing overall spectrum congestion in the unlicensed bands.
Data Source
AI summary
The present invention relates to wireless networks and more specifically to systems and methods for selecting available channels free of radar signals from a plurality of 5 GHz radio frequency channels. In non-limiting embodiments, exemplary systems, methods, and apparatuses are provided that can facilitate reducing false detections and/or network downtime in exemplary mesh networks employing dynamic frequency selection (DFS) channels. In a non-limiting aspect, radar information can be propagated among exemplary mesh nodes, including location information, to facilitate reducing false detections and/or network downtime in exemplary mesh networks. In addition, in further non-limiting aspects, exemplary embodiments can transmit signals to facilitate silencing one or more DFS channels and/or collaborative mesh node identification and/or discrimination of radar signals and false detections, among other non-limiting aspects provided.