Wireless Station Access Point Selection Using Allowance Area
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Solution Overview
Problem
Existing wireless LAN systems face challenges in selecting an optimal access point that minimizes interference while maintaining high signal strength, as existing methods only evaluate interference with the first-connected access point and do not identify the best access point for the wireless station.
Innovation Solution
A wireless station is equipped with an access point detection section, an allowance area calculation section, and an access point selection section that detect usable access points, calculate an allowance area based on received signal strength and frequency bandwidth, and select the access point with the largest allowance area to minimize interference and maximize signal strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a wireless station selects an access point based only on highest received signal strength indicator, then signal strength is maximized, but interference from overlapping frequency bandwidths increases
Solution Approach 1:
The patent changes the selection criterion from a single parameter (received signal strength indicator) to multiple parameters including received signal strength indicator, frequency, and frequency bandwidth. By considering these multiple parameters together, the system calculates an allowance area that reflects both signal quality and interference level, thereby selecting access points that provide stable communication with minimal interference
Solution Approach 2:
The patent introduces a new dimensional concept called 'allowance area' in the frequency-bandwidth dimension. Instead of only evaluating signal strength along the power dimension, the system now evaluates access points in a two-dimensional space combining signal strength and frequency bandwidth characteristics. This additional dimension allows the system to identify and avoid access points whose frequency bandwidths overlap with other access points, thus reducing interference while maintaining signal strength
2Device complexity
If a wireless station evaluates only the first-connected access point for interference, then evaluation complexity is reduced, but optimal access point selection is prevented
Solution Approach 1:
The patent applies preliminary action by having the wireless station detect and evaluate all available access points before making a connection decision. Instead of connecting to the first access point and then evaluating interference, the system pre-evaluates all access points using the allowance area calculation that considers received signal strength indicator, frequency, and frequency bandwidth. This preliminary comprehensive evaluation ensures optimal access point selection while maintaining manageable complexity through a systematic approach
Data Source
AI summary
A wireless station that includes an access point apparatus detection section which detects a usable access point apparatus from among a plurality of access point apparatuses; an allowance area calculation section which calculates an allowance area according to received signal strength indicator, frequency, and frequency bandwidth of a radio wave transmitted by a rogue access point apparatus whose frequency bandwidth overlaps with that of the usable access point apparatus, as well as according to received signal strength indicator, frequency, and frequency bandwidth of a radio wave transmitted by the usable access point apparatus; and an access point apparatus selection section which selects one access point apparatus based on the allowance area.