Frequency Band Scanning for Wireless LAN Connectivity
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Solution Overview
Problem
In wireless local area networks (WLANs) using multiple frequency bands, mobile devices face challenges in maintaining communication performance and preventing radio interference, especially for real-time applications like VoIP and video conferences, due to excessive scanning across all frequency bands which can lead to transmission delays and service disruptions.
Innovation Solution
A communication method where a mobile device limits the frequency band for scanning to a specific band initially used for connection and dynamically switches to another band only when necessary, based on signal loss, link quality, or geographical changes, thereby optimizing scanning operations and ensuring service continuity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mobile device scans all frequency bands to search for access points, then the device can discover available networks and maintain connectivity, but the scanning operation causes transmission delays and degrades communication performance for real-time applications
Solution Approach 1:
The patent segments the frequency bands into multiple groups (first frequency band and second frequency band) and performs scanning operations on different groups at different times. Instead of scanning all bands simultaneously or continuously, the device divides the scanning task into sequential segments, reducing the time each scanning operation occupies the communication channel and thereby reducing transmission delays while maintaining connectivity.
Solution Approach 2:
The patent implements dynamic scanning behavior where the mobile device adaptively adjusts its scanning operations based on current connection status, signal quality, and environmental conditions. The device dynamically switches between scanning different frequency bands based on whether it is connected to an access point and the quality of the current connection, optimizing the balance between maintaining connectivity and minimizing interference with real-time traffic.
2Adaptability or versatility
If a mobile device performs continuous scanning across all frequency bands, then the device can maintain up-to-date information about available networks, but the scanning operations cause service disruptions and degrade communication performance
Solution Approach 1:
The patent implements periodic scanning operations where the mobile device scans frequency bands at scheduled intervals rather than continuously. The device alternates between scanning the first frequency band and second frequency band in periodic cycles, ensuring that network discovery information remains relatively up-to-date while minimizing the disruption to ongoing communications. This periodic approach allows real-time traffic to proceed with minimal interruption.
Solution Approach 2:
The patent applies partial scanning action by selectively scanning only certain frequency bands at certain times based on connection status. When connected to an access point using the first frequency band, the device performs partial scanning limited to that band or scans the second band only periodically, rather than continuously scanning all bands. This partial action maintains sufficient network awareness while preserving communication performance.
3Reliability
If a mobile device scans multiple frequency bands simultaneously, then the device can discover more access points and maintain better connectivity, but the scanning operations create radio interference and disrupt real-time traffic flow
Solution Approach 1:
The patent segments the scanning operation to occur in separate time slots for different frequency bands. Instead of simultaneously scanning multiple bands which would create radio interference, the device sequentially scans the first frequency band during one time slot and the second frequency band during another time slot, eliminating mutual interference between scanning operations and reducing disruption to real-time traffic.
Solution Approach 2:
The patent maintains continuity of useful communication action by ensuring that scanning operations do not interrupt ongoing real-time traffic. The device continues to communicate on the current frequency band while performing scanning operations on other bands at different times, ensuring that the primary communication function remains continuous and uninterrupted while still achieving network discovery goals.
Data Source
AI summary
A communication method implemented in a mobile device is provided. The communication method includes limiting a frequency band on which the mobile device performs a scanning operation to a first frequency band used for a wireless connection of the mobile device; determining whether it is necessary to scan a second frequency band during a subsequent scanning operation of the mobile device; and in response to determining that it is necessary to scan the second frequency band, allowing the subsequent scanning operation to be performed on a plurality of frequency bands including the first and second frequency bands.