Wireless Channel Selector for Wi-Fi and ZigBee Interference
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Solution Overview
Problem
Interference between Wi-Fi and ZigBee communications in the 2.4 GHz ISM band leads to reduced transmission efficiency and power waste due to overlapping channels, necessitating a method to dynamically monitor and switch channels to maintain optimal data transmission.
Innovation Solution
A wireless network connecting apparatus with a channel selector that evaluates channel quality, excludes overlapping channels, and switches to the best available channel to minimize interference and maximize data transmission efficiency, using a channel management unit, selecting unit, and monitoring unit to dynamically adjust communication channels based on retransmission thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If Wi-Fi and ZigBee communications operate on identical bands simultaneously, then multi-interface wireless device functionality is achieved, but interference between data transmissions occurs and transmission efficiency is reduced
Solution Approach 1:
The patent segments the channel selection process into distinct phases: identifying preoccupied channels from Wi-Fi communications, determining available channels from ZigBee candidate channels by excluding overlapping ones, evaluating channel quality metrics for available channels, and selecting the optimal channel. This segmentation resolves the contradiction by systematically separating Wi-Fi and ZigBee channel management while maintaining both functionalities.
Solution Approach 2:
The patent implements dynamic channel selection by continuously monitoring channel quality indicators (such as signal strength, interference levels, and transmission success rates) and adapting the ZigBee operation channel based on current conditions. This dynamic approach allows the system to maintain high transmission efficiency while supporting both Wi-Fi and ZigBee interfaces, resolving the contradiction between versatility and productivity.
2Productivity
If channel switching is performed to avoid interference, then transmission efficiency is improved, but channel monitoring and switching complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-identifying and excluding channels that overlap with Wi-Fi preoccupied channels before ZigBee communication begins. By determining the set of available channels in advance and evaluating their quality metrics beforehand, the system reduces the need for complex real-time monitoring and switching operations, thus improving transmission efficiency while managing complexity.
Solution Approach 2:
The patent implements feedback mechanisms by monitoring channel quality indicators during transmission and using this information to dynamically adjust channel selection. The system evaluates metrics such as signal strength, interference levels, and transmission success rates, then feeds this information back to the channel selector to determine whether to switch channels. This feedback-driven approach improves transmission efficiency while keeping the monitoring system relatively simple by focusing on key performance indicators.
3Device complexity
If overlapping channels are used for Wi-Fi and ZigBee, then device simplicity is maintained, but data retransmissions occur and power is wasted
Solution Approach 1:
The patent extracts and removes overlapping channels from the set of candidate channels by identifying preoccupied Wi-Fi channels and excluding any ZigBee candidate channels that overlap with them. This extraction process creates a filtered set of available channels that are guaranteed not to interfere with Wi-Fi communications, thereby eliminating the need for retransmissions and reducing power waste while maintaining relatively simple channel management through systematic exclusion.
Data Source
AI summary
In a method for selecting an operation channel, a wireless network connecting apparatus is configured to: identify at least one preoccupied channel; determine a plurality of available channels; evaluate a channel quality of each of the available channels; select one of the available channels based on the channel quality thereof as the operation channel, and to switch to the operation channel; transmit an evaluation packet through the operation channel; determine whether the operation channel needs to be replaced, based on a number of data retransmissions; and exclude the operation channel from the available channels when the determination is affirmative.