WLAN Primary Channel Selection for Sub-1 GHz Interference
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Solution Overview
Problem
Wireless local area networks (WLANs) face challenges in selecting optimal primary communication channels, especially in sub-1 GHz frequency bands, where channel utilization and interference from other systems are prevalent, affecting throughput and range.
Innovation Solution
A method and apparatus for selecting a primary communication channel by scanning available channels, determining unused or minimally interfering channels, and aligning or overlapping with existing channels to optimize channel usage, allowing for channel aggregation to form wider bandwidth composite channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If channels are aggregated to form wider bandwidth composite channels, then data throughput is improved, but channel interference from other wireless communication systems increases
Solution Approach 1:
The patent segments the frequency spectrum into multiple individual channels (e.g., 20 MHz channels) that can be independently selected and aggregated. This segmentation allows the system to choose specific channels for aggregation based on interference conditions, rather than using a fixed wide bandwidth channel, thereby reducing interference while maintaining high throughput potential.
Solution Approach 2:
The patent implements dynamic channel selection and aggregation strategies where the system continuously monitors channel utilization by other wireless communication systems and adjusts which channels are aggregated in real-time. This dynamic adaptation allows the system to optimize throughput by aggregating channels with low interference while avoiding channels with high interference from other systems.
2Productivity
If channels are aggregated to form wider bandwidth composite channels, then data throughput is improved, but channel utilization efficiency deteriorates in densely utilized environments
Solution Approach 1:
The system dynamically adjusts channel aggregation configurations based on real-time monitoring of channel utilization by other wireless communication systems. When channels are densely utilized, the system can selectively aggregate only those channels with available capacity, optimizing utilization efficiency while maintaining throughput. This dynamic approach allows adaptation to varying environmental conditions.
Solution Approach 2:
The patent changes the parameters of channel aggregation by allowing flexible selection of which individual channels to aggregate and how many channels to combine. This parameter flexibility enables the system to optimize channel utilization efficiency by adjusting aggregation size and composition based on current spectrum conditions, rather than using a fixed aggregation configuration.
3Adaptability or versatility
If primary channels are selected without alignment considerations, then channel selection flexibility is improved, but interference with other wireless communication systems increases
Solution Approach 1:
The patent modifies the selection criteria for primary channels by introducing alignment as a configurable parameter. The system can adjust whether to prioritize alignment with other systems' channels or maximize selection flexibility, allowing optimization of the trade-off between flexibility and interference reduction based on specific operational requirements and environmental conditions.
Data Source
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AI summary
A set of channels is scanned, each channel in the set having a first bandwidth. When it is determined that one or more channels in the set of channels are not being utilized by one or more other wireless communication systems, a channel not being utilized is selected as a primary channel for a wireless communication system. When it is determined that all channels in the set of channels are being utilized by one or more other wireless communication systems, (i) a channel in the set that is aligned with a primary channel of another wireless communication system is selected as the primary channel, or (ii) a channel in the set that overlaps with a secondary channel of another wireless communication system is selected as the primary channel, where the secondary channel of the other wireless communication system has a bandwidth greater than the first bandwidth.