Wireless Channel Scanning via Adjacent Beacon Detection
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Solution Overview
Problem
Current wireless communication systems, such as those compliant with IEEE 802.11a/g/n standards, require devices to scan multiple channels for beacon signals, which can be time-consuming and inefficient, especially when there are many channels to search through.
Innovation Solution
A method where a receiver is tuned to a subset of channels and scans for beacon signals, utilizing a filter's passband to detect active channels without needing to tune to all channels, allowing for simultaneous scanning of multiple channels while tuned to a single channel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a receiver tunes to each channel sequentially to scan for beacon signals, then it can detect all active channels accurately, but the scanning time increases significantly
Solution Approach 1:
The patent divides the channel scanning process into two segments: a fast initial scan using a wide bandwidth filter to identify potentially active channels, followed by a verification step only for those identified channels. This segmentation allows the system to quickly filter out inactive channels without thoroughly examining every channel, thus reducing total scanning time while maintaining detection accuracy.
Solution Approach 2:
The patent applies partial action by scanning only a subset of channels in detail. Instead of sequentially tuning to every channel and performing complete beacon detection on each, the system performs a preliminary wide-band scan to identify active channels, then focuses detailed verification only on those identified channels. This partial approach significantly reduces scanning time while maintaining sufficient detection accuracy.
2Productivity
If a receiver uses a wide bandwidth filter to detect multiple channels simultaneously, then scanning time is reduced, but channel signal interference increases
Solution Approach 1:
The patent segments the scanning process into two stages with different filter characteristics:第一阶段 uses a wide bandwidth filter for rapid initial detection, while the second stage uses a narrower filter for verification. This segmentation allows the system to benefit from fast wide-band scanning without suffering from excessive interference during the verification phase.
Solution Approach 2:
The patent employs periodic action by alternating between wide-band and narrow-band filtering in a structured sequence. The system first performs wide-band scanning to identify active channels, then periodically switches to narrow-band filtering for verification. This periodic alternation allows the system to capture signals efficiently while minimizing interference through selective filtering.
Data Source
AI summary
A receiver is tuned to a first channel in a plurality of channels, and at least one beacon signal from at least one other channel is received while the receiver is tuned to the first channel. The at least one other channel is determined to be active based on the at least one beacon signal received while the receiver is tuned to the first channel. A channel that is determined to be “active” may be, for example, a communication channel on which an access point in a communication network is communicating or is able to communicate.