Dynamic Channel Puncturing for Wi-Fi Radar Interference
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Solution Overview
Problem
Existing technologies face challenges in efficiently using puncturing to mute subcarriers on a subchannel with interference, as it may not always be the most efficient response, especially when considering client device support, traffic characteristics, and spectrum wastage.
Innovation Solution
A channel-selection method that allows a wireless access point to decide between redefining the channel by removing subchannels with interference or puncturing the affected subchannel, based on factors such as client device support, traffic load, spectrum wastage, and radio-frequency density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If puncturing is used to mute subcarriers on a subchannel with radar interference, then the access point can continue using other subchannels, but spectrum wastage occurs for client devices that do not support puncturing
Solution Approach 1:
The patent changes the operational parameters by dynamically adjusting whether puncturing is applied based on the proportion of client devices that support it. When support is high, puncturing is enabled to maximize channel utilization; when support is low, puncturing is disabled to avoid spectrum wastage. This parameter-based decision resolves the contradiction between maintaining productivity and minimizing resource loss.
2Reliability
If the access point switches to a non-DFS channel or reduces bandwidth to avoid radar interference, then interference is avoided, but channel bandwidth and communication performance are reduced
Solution Approach 1:
The patent segments the channel into multiple subchannels and applies puncturing selectively to only those subchannels affected by radar interference. This allows the access point to maintain full bandwidth utilization on unaffected subchannels while avoiding interference on affected ones, thus preserving communication performance while ensuring reliability.
Solution Approach 2:
Instead of applying a uniform channel-wide solution, the patent applies puncturing locally only to specific subcarriers within affected subchannels. This localized approach maintains high communication performance on unaffected portions of the channel while providing reliable interference avoidance where needed.
3Productivity
If puncturing is performed without considering client device support, then channel bandwidth is maximized, but compatibility with legacy devices is lost
Solution Approach 1:
The patent implements a dynamic decision-making process that adjusts puncturing behavior based on real-time assessment of client device capabilities. The access point determines the proportion of puncturing-capable clients and dynamically enables or disables puncturing accordingly, ensuring both high bandwidth utilization when possible and broad device compatibility when necessary.
Data Source
AI summary
An access point in a wireless network communicates wirelessly with one or more client devices over a channel that includes a plurality of subchannels. Radar is detected on a first subchannel of the plurality of subchannels. It is determined to puncture the first subchannel, based on the detecting the radar on the first subchannel and based on one or more puncturing factors. The first subchannel is punctured, the puncturing comprising muting one or more subcarriers on the first subchannel.