WiFi Channel Power Selection for Edge-Station Connectivity
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Solution Overview
Problem
Conventional channel selection techniques in WiFi networks fail to consider channel power, leading to communication loss with edge-of-cell stations and poor signal-to-noise ratios, especially when switching channels to avoid interference.
Innovation Solution
An access point (AP) determines current channel interference and target channel utilization while considering channel powers to select a new channel, ensuring continued communication with edge-of-cell stations by prioritizing channels with suitable power levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the AP switches to a target channel to avoid interference, then the current channel interference is reduced, but edge-of-cell STAs may be left outside the range of the AP, resulting in loss of communication
Solution Approach 1:
The patent applies parameter changes by considering channel power levels as an additional parameter in the channel selection process. The AP evaluates not only interference levels but also the channel power characteristics when selecting a target channel, ensuring that the new channel maintains adequate signal strength for edge-of-cell STAs. This resolves the contradiction by changing the selection criteria from interference-only to a combined interference-power assessment.
2Object-affected harmful factors
If the AP switches to a target channel to avoid interference, then the current channel interference is reduced, but the signal-to-noise ratio of resulting signals is significantly negatively impacted
Solution Approach 1:
The patent resolves this contradiction by introducing channel power as a critical parameter in the channel selection decision. The AP selects a target channel only if it offers both reduced interference and adequate channel power to maintain signal-to-noise ratio. This dual-parameter approach prevents switching to channels that would degrade signal quality while still achieving interference avoidance.
3Measurement precision
If the AP performs comprehensive channel scanning to characterize the signal ecosystem, then the channel selection accuracy is improved, but the scanning time and operational disruption increase
Solution Approach 1:
The patent applies self-service by utilizing existing channel scanning infrastructure and data already collected by the AP for other purposes (such as monitoring channel utilization and interference). The channel power information is derived from routine operations and existing measurements, allowing the AP to perform accurate channel selection without requiring additional dedicated scanning time or external assistance.
Data Source
AI summary
In certain embodiments, an access point (AP) of a multi-channel (e.g., WiFi) communication network switches from operating at a current channel to operating at a new channel. The AP determines the current channel interference of the current channel and scans other channels to determine target channel utilizations of those other channels. The AP selects one of the other channels to be a new channel for the AP based on (i) the current channel interference, (ii) the target channel utilizations, and (iii) channel powers for the current channel and the other channels. By employing channel power, which typically varies with channel frequency, the AP avoids switching to a new channel at which the AP has diminished or no communication capability with one or more stations that are located at the edge of the AP's cell for the current channel.