Wireless Image System Radar Detection Channel Switching
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Solution Overview
Problem
In wireless local area networks operating in the 5 GHz band, dynamic frequency selection (DFS) technologies cause interruptions in real-time image transmission due to radar interference, leading to inefficient channel switching and potential communication disruptions.
Innovation Solution
An image communication system with a transmission-side and reception-side wireless communication unit capable of using multiple channels, incorporating a radar detection unit and channel use confirmation unit to dynamically switch between channels, ensuring continuous data transmission by identifying and switching to non-interfering channels during radar detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If DFS technology is used to avoid radar interference in the 5 GHz band, then communication reliability is improved, but image transmission continuity deteriorates due to transmission stops
Solution Approach 1:
The system performs channel availability check (CAC) monitoring for a predetermined time before using a communication channel to detect radar waves in advance. This preliminary detection allows the system to prepare for potential radar interference before actual transmission begins, reducing the impact on transmission continuity while maintaining reliability.
Solution Approach 2:
The patent introduces a buffer memory as an intermediary component that stores image data temporarily. When radar interference is detected and channel switching is required, the buffer maintains the transmission flow by providing pre-buffered data, thus mediating between the interruption caused by DFS and the requirement for continuous transmission.
2Object-affected harmful factors
If channel switching is performed when radar waves are detected, then interference avoidance is improved, but transmission response time deteriorates due to switching delays
Solution Approach 1:
The system continuously monitors communication channels for radar waves before transmission and performs channel availability checks in advance. This preliminary monitoring and pre-selection of alternative channels reduces the response time when radar interference is detected, as the switching decision and target channel are already prepared.
Solution Approach 2:
When radar waves are detected in the current channel, the system rapidly switches to a pre-identified alternative channel without performing full CAC monitoring on the new channel first. This rushing through the channel switching process minimizes transmission response time loss while still avoiding interference through the preliminary monitoring already performed.
3Measurement precision
If continuous monitoring for radar waves is performed, then detection accuracy is improved, but system complexity deteriorates due to monitoring overhead
Solution Approach 1:
The system performs continuous monitoring only on communication channels that are candidates for image data transmission, rather than monitoring all possible channels. This partial monitoring approach maintains detection accuracy for relevant channels while reducing the overall monitoring overhead and system complexity.
Solution Approach 2:
The radar detection unit is integrated into the existing wireless communication system, allowing the same hardware components to serve both communication and radar detection functions. This multi-functionality improves detection accuracy without significantly increasing system complexity, as the monitoring is performed using existing infrastructure.
Data Source
AI summary
An image communication system includes an image transmission apparatus and an image reception apparatus. The image transmission apparatus includes a transmission-side wireless communication unit. The image reception apparatus includes a reception-side wireless communication unit. At least one of the image transmission apparatus and the image reception apparatus includes a radar detection unit configured to execute a detection process on radio waves of radar in a communication channel that has a possibility of being used for image data communication by the transmission-side wireless communication unit and the reception-side wireless communication unit. At least one of the image transmission apparatus and the image reception apparatus includes a channel use continuation unit configured to execute channel use confirmation for confirming that the communication channel is usable by continuously monitoring the detection process by the radar detection unit for a predetermined time.