Dynamic Bandwidth Selection for 802.11ac Access Points
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Solution Overview
Problem
The IEEE 802.11ac amendment introduces wider channel widths, requiring dynamic channel assignment schemes that also account for coexistence with legacy 802.11n devices, but lacks clear conditions for access points to switch between bandwidths for optimal performance.
Innovation Solution
Dynamic bandwidth selection techniques that compute metrics based on interference, client composition, and traffic type to adjust bandwidths dynamically, allowing access points to switch between 20 MHz, 40 MHz, 80 MHz, and 160 MHz channels to optimize performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If access points operate with wider channel widths (80 MHz, 160 MHz, 80+80 MHz) as introduced by IEEE 802.11ac, then data rates and network throughput are significantly increased, but coexistence with legacy 802.11n devices becomes more difficult and interference management becomes more complex
Solution Approach 1:
The patent implements dynamic channel width selection where access points can switch between different bandwidth modes (20 MHz, 40 MHz, 80 MHz, 160 MHz, 80+80 MHz) based on real-time network conditions. This allows the system to adapt to mixed legacy and modern device environments while maintaining optimal performance when possible, and ensuring compatibility when legacy devices are present.
Solution Approach 2:
The system changes the operational parameter of channel width dynamically based on detected device types and network conditions. By monitoring the presence of legacy 802.11n devices versus modern 802.11ac devices, the access point adjusts its channel width parameter to balance between achieving high data rates with wide channels and ensuring compatibility with legacy devices through narrower channels.
2Productivity
If access points dynamically switch between different bandwidth modes to optimize performance, then network efficiency is improved, but the complexity of channel assignment schemes increases
Solution Approach 1:
The patent employs feedback mechanisms where access points continuously monitor network conditions including device types present, interference levels, and performance metrics. Based on this feedback, the system automatically adjusts channel width assignments dynamically. This feedback-driven approach simplifies the overall complexity by using standardized monitoring and adjustment protocols rather than requiring complex manual configuration schemes.
3Productivity
If access points use wider bandwidth channels, then achievable data rates increase significantly, but susceptibility to interference from non-WLAN devices and co-channel interference increases
Solution Approach 1:
The system dynamically adjusts channel width based on real-time interference conditions. When wide bandwidth channels are available and interference levels are low, the system utilizes 80 MHz, 160 MHz, or 80+80 MHz channels to achieve high data rates. When interference from non-WLAN devices or co-channel interference is detected, the system automatically switches to narrower 20 MHz or 40 MHz channels, reducing susceptibility to interference while maintaining acceptable performance.
Data Source
AI summary
Dynamic bandwidth selection techniques are provided for a plurality of wireless access point devices that operate in a wireless local area network. Each access point device is capable of serving wireless client devices with a bandwidth from a set of possible bandwidths associated with one or multiple contiguous or non-contiguous radio frequency channels. A bias is generated based on determined type of traffic or client composition for each access point device, the bias favoring a channel assignment that results in a particular bandwidth in the set of bandwidths. The bias is applied to metrics representing severity and degree of interference for each channel to generate adjusted metrics. A bandwidth from the set of possible bandwidths is selected for each access point device based on the adjusted metrics.