Central Controller Channel Assignment for Wi-Fi Interference
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Solution Overview
Problem
Current distributed wireless networks face challenges in adapting to changing traffic conditions, leading to inefficiencies in channel allocation and interference management, which affect the quality of service in IEEE 802.11 infrastructure networks.
Innovation Solution
A method that measures interference between access points, assigns radiofrequency channels based on measured interference, and creates distributed antenna groups, while also considering network load and capacity, using a central controller to manage channel assignment, load balancing, and distributed antenna creation to optimize performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If distributed antenna groups are created with multiple access points operating on the same radio frequency channel, then spatial diversity and coverage are improved, but co-channel interference increases
Solution Approach 1:
The network is segmented into multiple distributed antenna groups, where each group operates on a specific radio frequency channel. Access points are divided into different groups based on interference graphs, allowing spatial diversity within groups while managing interference between groups through channel assignment.
Solution Approach 2:
The system dynamically changes the radio frequency channel assignment parameter based on measured interference levels and traffic conditions. The central controller adjusts channel assignments to optimize the balance between spatial diversity benefits and co-channel interference mitigation.
2Object-affected harmful factors
If radiofrequency channels are assigned based on measured interference, then co-channel interference is reduced, but system complexity increases
Solution Approach 1:
A central controller acts as an intermediary to manage the complex channel assignment process. It collects interference measurements from access points, generates interference graphs, and calculates optimal channel assignments, thereby simplifying the overall system architecture and reducing the computational burden on individual access points.
Solution Approach 2:
The system implements continuous feedback loops where access points measure interference levels and report them to the central controller. The controller uses this feedback to dynamically adjust channel assignments, creating a self-optimizing system that adapts to changing interference conditions without requiring complex manual configuration.
3Productivity
If clients are assigned to distributed antenna groups based on network load metrics, then load balancing is improved, but assignment complexity increases
Solution Approach 1:
The central controller serves as an intermediary that handles complex client assignment decisions. It evaluates multiple metrics including network load, interference levels, and client requirements to determine optimal client-to-antenna-group assignments, thereby simplifying the complexity for individual access points and clients while achieving effective load balancing.
4Reliability
If the system dynamically adapts to traffic conditions, then quality of service is improved, but processing requirements increase
Solution Approach 1:
The system implements partial adaptation by focusing dynamic adjustments on critical parameters such as channel assignment and client grouping, while maintaining stable configurations for less sensitive aspects. This selective approach provides sufficient quality of service improvement without requiring exhaustive reconfiguration of all system parameters, thereby reducing processing energy consumption.
Data Source
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AI summary
In a method for organizing an architecture of access points in a distributed wireless network, e.g. an IEEE802.11 type network, the interference between the access points is measured, radiofrequency channels are assigned to the access points based on the measured interference and distributed antenna groups of multiple access points operating on the same radio frequency channel are created. The invention provides a distributed wireless network comprising. Furthermore, a system comprising a plurality of access points and a central controller connected to the access points via a common backbone is provided, the central controller being adapted for assigning radio frequency channels to the access points by using the method of the invention.