Adaptive CCA Level Selection for WLAN Spatial Reuse
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Solution Overview
Problem
Current Wireless Local Area Network (WLAN) systems face challenges in determining channel availability efficiently, leading to suboptimal spatial reuse rates due to interference and collision detection issues.
Innovation Solution
A method that compares received signal strengths with selected Clear Channel Assessment (CCA) levels, using both high efficiency (HEW) and legacy CCA levels to determine channel availability, allowing for increased spatial reuse by adjusting Network Allocation Vector (NAV) settings based on specific frame types and signal strengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single CCA level is used for all WLAN signals, then the system maintains simplicity in implementation, but spatial reuse rate is reduced due to interference and collision detection issues
Solution Approach 1:
The patent applies local quality by using different CCA levels for different types of WLAN signals. Specifically, a first CCA level is used for high efficiency WLAN signals while a second CCA level is used for legacy WLAN signals. This allows the system to optimize channel availability determination for each signal type locally, improving spatial reuse rate without requiring complete system complexity increase.
Solution Approach 2:
The patent implements dynamics by making the CCA level adaptive rather than fixed. The system dynamically selects between first and second CCA levels based on the type of received WLAN signal. This dynamic adaptation enables the system to respond to different signal conditions appropriately, enhancing spatial reuse while maintaining manageable complexity through rule-based selection.
2Productivity
If a higher CCA level is used to increase spatial reuse, then more channels become available for transmission, but interference and collision detection accuracy deteriorates
Solution Approach 1:
The patent applies local quality by tailoring the CCA level to the specific signal type being evaluated. For high efficiency WLAN signals, a first CCA level provides appropriate sensitivity, while for legacy WLAN signals, a second CCA level is used. This localized optimization ensures that each signal type is assessed with the appropriate threshold, maintaining detection accuracy while enabling increased spatial reuse.
Solution Approach 2:
The patent changes the CCA level parameter based on signal type classification. By adjusting this critical parameter dynamically - using a first CCA level for high efficiency signals and a second CCA level for legacy signals - the system optimizes both spatial reuse rate and channel availability determination accuracy simultaneously.
3Adaptability or versatility
If legacy CCA procedure with legacy CCA level is used, then compatibility with existing systems is maintained, but spatial reuse rate is limited
Solution Approach 1:
The patent implements universality by making the CCA mechanism serve multiple functions. The same CCA procedure handles both legacy WLAN signals and high efficiency WLAN signals, but with adaptive level selection. This multi-functionality maintains compatibility with legacy systems while enabling improved spatial reuse for high efficiency signals, allowing one system to serve multiple purposes effectively.
Solution Approach 2:
The patent applies dynamics by making the CCA level adaptive based on signal type. The system maintains legacy compatibility by using the second CCA level for legacy signals, while simultaneously enabling improved spatial reuse by using the first CCA level for high efficiency signals. This dynamic adaptation allows the system to evolve functionality without breaking legacy compatibility.
Data Source
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AI summary
The present document relates to a method for determining whether a corresponding medium (for example, a channel) is reusable so as to improve a space reuse rate in a wireless communication system, particularly, a wireless LAN system, and an apparatus for the same. To this end, a station receives a wireless LAN signal through a specific wireless medium, compares the received signal intensity of the wireless LAN signal with a CCA level selected from between a first CCA level and a second CCA level lower than the first CCA level according to the type of the received wireless LAN signal, determines that the corresponding wireless medium is usable if the received signal intensity is lower than the selected CCA level, and can use the wireless medium in a signal transmission.