WLAN Dynamic Frequency Puncturing for Cellular Interference
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Solution Overview
Problem
Conventional systems fail to provide adequate and dynamic interference mitigation in wireless networks, particularly for dual-capability client devices experiencing interference between cellular and Wi-Fi networks, leading to significant reception quality degradation.
Innovation Solution
Client devices detect interference and report unsafe frequencies to the WLAN infrastructure, which then performs dynamic frequency puncturing to mitigate interference by selectively avoiding specific frequency ranges, rather than entire channels, using techniques like bit filtering to notch out interfering frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dynamic frequency puncturing is implemented to mitigate interference, then reception quality improves, but device complexity increases
Solution Approach 1:
The patent segments the frequency spectrum into multiple sub-channels or resource units, allowing selective puncturing of only those frequency portions experiencing interference. This enables granular control where individual resource units can be activated or deactivated based on real-time interference conditions, improving reception quality without requiring complete channel avoidance that would waste bandwidth resources.
Solution Approach 2:
The patent implements dynamic frequency puncturing where the set of punctured frequencies changes adaptively based on real-time interference detection. The system continuously monitors interference conditions and dynamically adjusts which frequency resources are punctured, transitioning from static channel allocation to dynamic resource allocation that responds to changing environmental conditions.
2Object-affected harmful factors
If frequency puncturing is used to avoid interference, then interference mitigation improves, but resource utilization deteriorates
Solution Approach 1:
The patent applies local quality by treating different frequency resources differently based on their individual interference conditions. Instead of uniformly avoiding entire channels, the system identifies and punctures only the specific frequency sub-channels or resource units experiencing interference, while maintaining transmission on unaffected frequency resources within the same channel, thus optimizing the local quality of each frequency resource.
Solution Approach 2:
The patent changes the parameter of frequency resource allocation from fixed channel assignment to dynamic resource unit selection. By modifying which frequency parameters are active at different times based on interference conditions, the system adapts the spectral characteristics of transmissions to match current environmental conditions, improving both interference mitigation and resource utilization.
3Reliability
If entire channels are avoided to mitigate interference, then reception quality improves, but bandwidth utilization deteriorates
Solution Approach 1:
The patent segments wide frequency channels into smaller resource units that can be independently controlled. This allows the system to puncture only the specific frequency portions experiencing interference rather than avoiding entire channels, thereby maintaining bandwidth utilization on clean frequency resources while protecting reception quality on affected frequencies.
Data Source
AI summary
An unsafe frequency report from a client device is received, the unsafe frequency report indicating that the client device is experiencing interference on a set of frequencies. A set of safe frequencies is identified, for the client device, based on interference indicated in the unsafe frequency report, and dynamic puncturing is performed based on the unsafe frequency report, comprising identifying an allocation of wireless resources for the client device during a transmission opportunity based on the set of safe frequencies, where the allocation of wireless resources punctures one or more of the set of frequencies, and communicating with the client device using the allocation of wireless resources.