BSS Color-Based Channel Selection and Power Control for Dense WLAN Interference
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Solution Overview
Problem
Dense WLAN deployments face performance issues due to interference, congestion, and low throughput, with existing techniques like Dynamic Sensitivity Control and Basic Service Set (BSS) coloring only addressing frequency reuse and not alternate channel usage or spatial reuse.
Innovation Solution
The method involves determining channels and adjusting transmission power levels for access points based on BSS color parameters, enabling spatial reuse transmissions to certain client stations while avoiding others, to mitigate interference and improve network efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If BSS color schemes are used to differentiate intra-BSS and OBSS frames, then frequency reuse is improved, but co-channel interference is not resolved via alternate channels or spatial reuse
Solution Approach 1:
The patent extends BSS color usage from single-channel frequency differentiation to multi-dimensional channel selection. Access points use BSS color parameters to identify OBSS networks and select alternate communication channels, transforming the problem from 2D (frequency reuse on one channel) to 3D (channel selection across multiple frequencies), thereby reducing co-channel interference while maintaining frequency reuse benefits
Solution Approach 2:
The patent applies selective spatial reuse transmissions by BSS color, where each BSS network can independently select channels and adjust power levels based on local OBSS detection. This localized control allows each network to optimize its channel usage without affecting others, resolving interference at the source rather than applying blanket frequency reuse across all networks
2Area of stationary object
If transmit power levels are increased to improve signal strength, then network coverage is improved, but interference to other BSS networks increases
Solution Approach 1:
The patent implements local quality by allowing each BSS to independently adjust transmit power levels based on detected OBSS networks. Access points monitor BSS color parameters and selectively increase power only in directions or time slots where OBSS interference is absent, while maintaining lower power toward neighboring BSS networks, thereby achieving extended coverage without proportional interference increase
Solution Approach 2:
The patent introduces dynamic transmit power adjustment based on real-time OBSS detection and BSS color identification. Power levels are not static but adapt continuously to the presence and density of overlapping BSS networks, allowing the system to optimize between coverage area and interference generation based on current network conditions
3Productivity
If more access points are added to dense WLAN deployments, then network capacity is improved, but congestion and interference increase
Solution Approach 1:
The patent resolves the capacity-congestion contradiction by introducing channel dimension to BSS color management. As more access points are added to dense deployments, each new BSS can be assigned unique color parameters and alternate channels, transforming the congested single-channel environment into a multi-channel spectrum, thereby maintaining network capacity growth without proportional congestion increase
Solution Approach 2:
The patent applies parameter changes by utilizing BSS color parameters as the key differentiator for channel selection and spatial reuse decisions. As BSS density increases, the system leverages the expanded parameter space of available colors and channels to allocate resources dynamically, preventing congestion despite increased network density
Data Source
AI summary
Methods, systems, and apparatuses for network management are disclosed. For example, one or more network identifiers (e.g., Basic Service Set (BSS) color parameters) may be used to mitigate co-channel interference by causing a communication device to switch to a different channel, by causing a communication device to adjust transmit power, and/or to cause a communication device to selectively send spatial reuse (SR) transmissions.