WDS Access Point Channel Switching for Radar Interference
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Solution Overview
Problem
Wireless communication devices used as repeaters face challenges in quickly reestablishing communication after detecting interfering radar or radio signals, particularly in the 5 GHz frequency band, due to the need for dynamic frequency selection and potential interference with other systems, leading to temporary network disconnections.
Innovation Solution
A wireless communication device equipped with an interfering radio signal detection module, a channel change module, and a newly allocated channel notification module, which detects interference, changes channels within a preset time, and notifies the other end of communication to facilitate rapid reestablishment of communication, including a non-interference check module to ensure channel suitability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the wireless communication device performs DFS monitoring and channel scanning to avoid radar interference, then interference avoidance is achieved, but communication reestablishment time increases significantly
Solution Approach 1:
The patent applies preliminary action by having the wireless communication device pre-monitor and detect radar signals before actually switching channels. The DFS monitoring function continuously checks for radar presence in advance, allowing the device to prepare for channel switching proactively rather than reactively, thus reducing the actual reestablishment time when interference is detected
Solution Approach 2:
The patent implements feedback mechanisms where the wireless communication device continuously monitors channel conditions and radar presence, then uses this information to dynamically adjust channel selection. The system receives feedback about radar detection results and automatically responds by switching to alternative channels, creating a closed-loop control system that optimizes communication continuity
2Ease of operation
If the wireless communication device scans all available channels to identify the newly allocated channel, then channel identification is achieved, but the time required for communication reestablishment increases
Solution Approach 1:
The patent applies preliminary action by having the wireless communication device obtain information about newly allocated channels through notification from the other end of communication before actually performing full channel scans. This preliminary information provision allows the device to narrow down its search scope significantly, avoiding the need to scan all available channels systematically
Solution Approach 2:
The patent extracts only the necessary information about the newly allocated channel from the other end of communication, rather than requiring complete channel scanning. By taking out just the specific channel identification information needed, the system avoids the time-consuming process of scanning all channels while still achieving accurate channel identification
3Object-affected harmful factors
If the wireless communication device immediately stops using the currently used channel upon radar detection, then interference avoidance is achieved, but communication continuity is disrupted
Solution Approach 1:
The patent applies preliminary action by continuously monitoring for radar signals before they cause actual interference. The DFS monitoring function detects radar presence in advance, allowing the system to prepare for channel switching and minimize the disruption to communication continuity. The immediate stop action is taken only after confirmed radar detection, not on suspicion alone
Solution Approach 2:
The patent uses the notification mechanism as an intermediary between radar detection and channel switching. The other end of communication notifies about the newly allocated channel, serving as a mediator that coordinates the channel switching process between two devices, ensuring that both ends switch to the same channel simultaneously and maintaining communication reliability
Data Source
AI summary
When radar/radio signals are detected by one of two access points establishing communication in a WDS mode, the one access point notifies the other access point of a change of a communication channel to a newly allocated channel and actually changes the communication channel to the newly allocated channel. The other access point notified of the newly allocated channel performs a passive scan at the notified newly allocated channel to detect a beacon broadcasted by the one access point. In response to detection of the beacon, the other access point resets the communication channel to the notified newly allocated channel. The two access points can accordingly reestablish communication in the WDS mode within a short time period. This arrangement allows for a quick channel change in response to detection of radar/radio signals, such as a weather radar, during communication of a 5 GHz frequency band in the WDS mode.