Wireless Station Control Apparatus Frequency Band Selection
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Solution Overview
Problem
The IEEE802.11 standard lacks a defined method for selecting the operating frequency band and channel for wireless base stations, leading to inefficient operation and reduced throughput in dense wireless LAN environments, where multiple stations share limited channels, causing service area issues and quality of service degradation.
Innovation Solution
A wireless communication system where wireless stations notify a control apparatus of their capability and environment information, allowing the apparatus to select the most appropriate frequency band for each station based on area coverage rate, optimizing the frequency band usage to improve area coverage and throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If wireless stations autonomously select frequency bands and channels without centralized control, then device complexity is reduced and ease of operation is improved, but throughput deteriorates and service area coverage becomes inefficient in dense wireless LAN environments
Solution Approach 1:
A frequency band determination apparatus is introduced as an intermediary between wireless stations and the frequency selection process. This apparatus collects capability information from wireless stations and environment information about surrounding stations, then determines the optimal frequency band for each station. This resolves the contradiction by providing intelligent centralized control that improves throughput while maintaining operational simplicity through automated decision-making.
Solution Approach 2:
The system implements feedback mechanisms where wireless stations notify the frequency band determination apparatus of their capability and environment information. The apparatus uses this feedback to dynamically determine optimal frequency bands for each station based on real-time conditions. This feedback loop enables the system to adapt to changing network conditions and optimize throughput while maintaining ease of operation.
2Adaptability or versatility
If multiple wireless stations share limited channels in the same location, then adaptability is improved, but interference increases and throughput decreases
Solution Approach 1:
The frequency band determination apparatus applies local quality by determining individual frequency bands for each wireless station based on their specific capability information and local environment. Instead of uniform channel assignment, each station receives a customized frequency band assignment that considers its unique characteristics and surrounding conditions. This localized approach minimizes interference while maintaining the adaptability needed for multi-station operation.
Solution Approach 2:
The system segments the frequency spectrum into different bands (e.g., 2.4 GHz and 5 GHz bands) and further divides them into specific channels. The frequency band determination apparatus assigns specific segments to different stations based on their capabilities and environmental conditions. This segmentation allows multiple stations to operate simultaneously with minimal interference by distributing them across different frequency segments.
3Ease of operation
If the 2.4 GHz band is used for wireless communication, then ease of operation is improved due to license-free operation, but area coverage rate deteriorates when multiple stations are deployed
Solution Approach 1:
The system resolves the coverage limitation of the 2.4 GHz band by introducing a dimensional change in the frequency spectrum - utilizing the 5 GHz band as an additional dimension. The frequency band determination apparatus assigns 5 GHz bands to stations where needed, effectively adding a new spectral dimension to the network. This allows the system to maintain the ease of operation of license-free bands while overcoming the area coverage limitations through multi-band operation.
Data Source
AI summary
In a wireless communication system in which a plurality of wireless stations perform transmission on a shared frequency band, the wireless stations each include means for notifying a wireless station control apparatus of capability and environment information that includes information about capability of a local wireless station and information about a surrounding environment, and the wireless station control apparatus includes control means for selecting, based on capability and environment information collected from the wireless station, a frequency band to be used for the wireless station capable of using a plurality of frequency bands in accordance with a predetermined control index and setting the selected frequency band. Based on an area coverage rate of the wireless station as the control index, a frequency band with which an area coverage rate of the wireless station having an area coverage rate of less than or equal to a predetermined threshold is improved is selected.