Radar Detection and Channel Switching for Wireless Image Transmission
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Solution Overview
Problem
In wireless local area networks operating in the 5 GHz band, real-time image transmission is disrupted by radar interference, leading to frequent channel changes and communication interruptions due to the need for dynamic frequency selection (DFS) to avoid radar detection, which complicates continuous data transmission.
Innovation Solution
The implementation of an image communication system with radar detection units and channel use confirmation units that monitor communication channels for radar activity, allowing for seamless switching to alternative channels to maintain continuous data transmission without interruptions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dynamic frequency selection (DFS) is implemented to avoid radar interference, then communication reliability is improved, but communication continuity deteriorates due to frequent channel changes and interruptions
Solution Approach 1:
The patent performs channel availability check (CAC) in advance before switching to a DFS channel. The receiver monitors the candidate channel for radar signals during a predetermined period before the switch, ensuring the channel is safe for use. This preliminary monitoring action prevents interruptions by preparing a valid alternative channel before the current one becomes unusable.
Solution Approach 2:
The patent maintains continuous image data transmission by overlapping the CAC monitoring period with the remaining transmission time on the current channel. The receiver continues monitoring the candidate channel even as transmission on the current channel proceeds, ensuring seamless transition without breaking the continuity of useful action.
2Object-affected harmful factors
If channel switching is performed upon radar detection, then interference avoidance is improved, but transmission time is lost due to stopping and resuming communication
Solution Approach 1:
The system performs CAC monitoring in advance on candidate channels before needing to switch. When radar is detected on the current channel, the receiver can immediately switch to a pre-verified safe channel, avoiding the time loss that would occur if CAC had to be performed after detection.
Solution Approach 2:
The patent allows the transmitter to continue transmitting on the current channel for a predetermined period after radar detection, skipping the interruption that would normally occur. The receiver switches to the alternative channel during this period, rushing through the transition without stopping the overall transmission flow.
3Reliability
If CAC is performed on a candidate channel before switching, then channel safety is improved, but switching time is increased due to monitoring requirements
Solution Approach 1:
The system performs CAC monitoring in advance on candidate channels before they are needed for switching. This preliminary safety verification ensures that when a channel switch is required, the alternative channel is already confirmed safe, reducing the actual switching time.
Solution Approach 2:
The patent dynamically adjusts the monitoring duration based on the remaining transmission time. If the remaining time is shorter than the predetermined monitoring period, the monitoring is shortened accordingly. This dynamic adjustment optimizes the balance between channel safety verification and switching speed.
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 confirmation 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.