Wireless Apparatus Radar Interference Avoidance in Ad-Hoc Multihop Networks
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Solution Overview
Problem
Current wireless communication systems in Ad-Hoc mode under multihop circumstances fail to effectively implement the Dynamic Frequency Selection (DFS) function, which is necessary to avoid interference with radar systems, leading to communication disruptions and inefficiencies.
Innovation Solution
The implementation of a wireless apparatus and system that includes a DFS function with enhanced features such as shorter Beacon frame transmission intervals, Channel Switch Announcement (CSA) frame management, identification information for CSA frame selection, and channel list notification to adjacent devices, allowing for efficient channel switching and interference avoidance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the DFS function is implemented in Ad-Hoc mode under multihop circumstances, then radar interference avoidance is improved, but communication connectivity and reliability deteriorate due to channel switching requirements
Solution Approach 1:
The patent implements preliminary radar detection before channel selection and uses prediction mechanisms to forecast interference patterns. By detecting radar signals in advance and pre-calculating safe channel paths, the system avoids the need for reactive channel switching during communication, thus maintaining connectivity while preventing radar interference.
Solution Approach 2:
The patent introduces an intermediary coordination mechanism between multihop nodes. A central coordinator or intermediary node manages channel selection and switching decisions across the entire communication path, ensuring that all nodes switch channels simultaneously and maintaining communication connectivity during DFS operations.
2Object-affected harmful factors
If channel switching is performed to avoid radar detection, then radar interference avoidance is improved, but communication disruption increases
Solution Approach 1:
The system performs radar detection and channel selection in advance before actual communication begins. By pre-identifying safe channels and preparing switching sequences beforehand, the patent minimizes the time required for channel switching during operation, reducing communication disruption while maintaining radar avoidance.
Solution Approach 2:
The patent implements periodic radar detection cycles and scheduled channel monitoring. Instead of continuous reactive switching, the system performs radar detection at regular intervals and uses prediction to anticipate interference patterns, allowing for more efficient, less disruptive channel changes that maintain communication continuity.
3Object-affected harmful factors
If all nodes switch channels simultaneously, then DFS function is improved, but frequency usage efficiency deteriorates due to coordinated switching requirements
Solution Approach 1:
The patent uses prediction mechanisms to forecast which channels will be safe for use after radar detection. By pre-calculating optimal channel assignments based on predicted interference patterns, the system can coordinate channel switching more efficiently, allowing nodes to switch to predetermined safe channels rather than requiring complex real-time coordination, thus improving frequency usage efficiency.
Solution Approach 2:
The system implements feedback mechanisms where nodes report their channel switching status and radar detection results. This feedback information is used to refine future channel selection predictions and optimize the coordination protocol, enabling more efficient frequency usage while maintaining simultaneous switching capability for DFS compliance.
Data Source
AI summary
A wireless apparatus which can realize a DFS function that avoidance of interference with radar is considered in an Ad-Hoc mode under a multihop circumstance is provided. A Beacon frame is transmitted at a shorter interval than a previously set interval when radar is detected by wireless apparatuses N1 to N6 which have a DFS function which perform avoidance of interference with radar.