Wireless Access Point Selection via Interference Adjacency
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Solution Overview
Problem
Existing wireless LAN systems face interference issues due to limited channel availability and overlapping communication ranges, leading to increased communication errors and reduced throughput, especially when selecting access points based solely on signal strength or interference power without considering interference adjacency.
Innovation Solution
A wireless apparatus that scans accessible access points, calculates an estimated communication efficiency value based on received signal strength, interference signal strength, and interference adjacency, and selects the access point with the highest efficiency to minimize communication errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a wireless access point is selected based on highest received signal strength, then connection reliability is improved, but communication throughput decreases when interference sources exist in close range
Solution Approach 1:
The patent changes the selection parameter from simple received signal strength to a composite metric that includes interference signal strength and interference adjacency. This allows the system to account for both signal quality and interference conditions, resolving the contradiction between connection reliability and communication throughput by selecting access points that optimize overall communication performance rather than just signal strength.
Solution Approach 2:
The patent introduces an interference adjacency metric as an intermediary factor that mediates between signal strength and actual communication performance. This intermediary parameter helps identify access points that may have strong signals but are surrounded by interference sources, allowing the system to avoid selecting such access points and thereby maintain both reliability and throughput.
2Object-affected harmful factors
If a channel is selected with lowest interference wave power, then interference is reduced, but communication throughput decreases when received radio wave is weak
Solution Approach 1:
The patent changes the channel selection criterion from minimizing interference wave power alone to a balanced evaluation that considers both interference levels and received signal strength. This resolves the contradiction by ensuring that channels with low interference are selected only when they also provide adequate signal strength, thereby maintaining communication throughput while reducing interference.
3Area of stationary object
If multiple wireless access points are provided with overlapping communication ranges, then coverage area is improved, but interference between access points increases
Solution Approach 1:
The patent implements a feedback mechanism where the wireless terminal evaluates interference adjacency and signal strength from multiple access points before selection. This feedback loop allows the system to dynamically choose the optimal access point based on current interference conditions, enabling overlapping coverage areas to coexist without significant interference by continuously adapting to the radio environment.
Data Source
AI summary
PER when a wireless apparatus is connected with a predetermined wireless access point is estimated on the basis of three parameters of the received signal strength, the interference signal strength, and the interference adjacency, which have been transmitted from the wireless access point, then the communication throughput is calculated by using the estimated PER, and the connection with a wireless access point expected to have highest communication efficiency is performed. As a result, it is possible to select a wireless access point having high communication efficiency with good precision, as compared with a method, in the related art, of simply performing a connection with a wireless access point having high received signal strength or a method of simply performing a connection with a wireless access point where an interference wave is strong.