Dynamic Frequency Selection via Interference Avoidance Database
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Solution Overview
Problem
Wireless devices, particularly WLANs and automobile radars, face interference and quality of service issues due to the need for dynamic frequency selection, which can be problematic for real-time applications like voice over IP and video, as they require immediate channel scanning, leading to poor service quality.
Innovation Solution
A method where network controllers coordinate interference avoidance by generating and updating an interference avoidance database, exchanging information about primary users, including radars, to dynamically select channels and avoid interference, allowing for real-time adjustments and improved service quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a WLAN device performs channel scanning for dynamic frequency selection, then interference with radar applications is avoided, but real-time service quality deteriorates due to delayed response
Solution Approach 1:
The system performs preliminary channel scanning and stores frequency availability information in advance. Network controllers pre-scan channels and maintain databases of available frequencies, so when real-time communication is needed, the device can immediately use pre-validated frequencies without performing time-consuming scans at the moment of transmission.
Solution Approach 2:
The patent combines multiple scanning operations into a single coordinated effort. Instead of each device independently scanning channels, network controllers consolidate scanning activities and share results across the network, reducing redundant scanning time while maintaining comprehensive interference avoidance.
2Object-affected harmful factors
If an automobile radar performs channel scanning prior to operation, then interference with other radar applications is prevented, but collision avoidance response time is delayed
Solution Approach 1:
The system implements feedback mechanisms where radar devices continuously monitor channel conditions and receive information about frequency availability from network controllers. This feedback loop allows radars to adapt their operating frequencies based on real-time network knowledge without performing exhaustive scans, enabling faster response while avoiding interference.
Solution Approach 2:
Frequency availability information is determined in advance by network controllers and made available to automobile radars before they need to operate. This preliminary determination of safe frequencies eliminates the need for time-consuming pre-operation scanning by individual radar devices.
3Adaptability or versatility
If dynamic frequency selection is implemented, then coexistence of WLAN and radar applications is achieved, but system complexity increases due to coordination requirements
Solution Approach 1:
The patent introduces network controllers as intermediary entities that manage frequency coordination between WLAN devices and radar applications. These controllers act as mediators that consolidate the complexity of frequency management, allowing individual devices to simply query available frequencies rather than implementing complex coordination logic themselves.
Solution Approach 2:
The system enables devices to autonomously select appropriate frequencies based on information provided by network controllers. Once the network controller provides availability information, individual devices can independently make frequency selection decisions without requiring continuous coordination or complex interaction protocols.
Data Source
AI summary
A method in a communication network comprising a plurality of network controllers and a plurality of mobile nodes served by at least one of the plurality of network controllers is provided. The method includes the plurality of network controllers coordinating interference avoidance by co-operatively generating an interference avoidance database. The method further includes at least one of the plurality of network controllers updating the interference avoidance database, wherein updating the interference avoidance database includes receiving at least one interference avoidance related information from at least one of the plurality of mobile nodes. The method further includes the at least one of the plurality of network controllers communicating the updated interference avoidance database to at least one another of the plurality of network controllers