Controller-Based Channel Selection for Wi-Fi Access Points
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Solution Overview
Problem
Existing Wi-Fi access points independently select channels and channel widths without considering hidden access points or central data, leading to inefficient channel allocation and suboptimal communication performance due to channel overlap and congestion.
Innovation Solution
Access points and a computer system collaboratively select channels and channel widths based on communication-performance metrics, including RSSI and SNR, and feedback from neighboring access points to avoid channel overlap and optimize channel usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If access points independently select channels based on local radio-frequency conditions, then each access point can adapt to its immediate environment, but channel overlap and congestion occur due to lack of coordination with hidden access points
Solution Approach 1:
A controller acts as an intermediary between access points, collecting radio-frequency environment information from multiple access points and coordinating channel selections to prevent overlap. The controller receives information from access points about their local conditions and uses this data to make centralized channel assignment decisions that avoid congestion while maintaining local adaptability.
Solution Approach 2:
The system implements feedback loops where access points report their radio-frequency conditions to the controller, and the controller provides channel assignments back to access points. This continuous feedback mechanism allows the system to adapt to changing conditions while maintaining coordinated channel usage across the network, preventing both overlap and congestion.
2Device complexity
If access points use preconfigured channel widths, then device complexity is reduced, but communication performance becomes suboptimal as channel widths cannot adapt to current wireless conditions
Solution Approach 1:
The system transitions from static preconfigured channel widths to dynamic channel width selection. The controller receives information about current wireless conditions from access points and dynamically adjusts channel widths based on real-time radio-frequency environment data, allowing the system to optimize communication performance while maintaining simplicity through centralized control.
3Loss of information
If access points perform frequent channel scans to detect hidden access points, then situational awareness improves, but loss of time and energy increases due to repeated scanning operations
Solution Approach 1:
The patent merges the scanning functions of multiple access points through a centralized controller. Instead of each access point independently performing scans, the controller consolidates scanning operations and aggregates information from multiple access points, reducing redundant scanning while maintaining comprehensive awareness of hidden access points across the network.
Data Source
AI summary
A computer system (such as a controller) that selects channels and/or channel widths for use during communication in a shared band of frequencies is described. During operation, the computer system may receive, associated with access points in a region (such as a zone), information specifying unavailable channels associated with the shared band of frequencies, where the unavailable channels are currently used by the access points. For example, the information may be included in access-point status reports from the access points. Then, based at least in part on the unavailable channels, the computer system may determine the channels and/or the channel widths for use by the access points during communication in the shared band of frequencies in the region. Next, the computer system may provide, addressed to the access points, second information specifying the determined channels and/or the channel width.