Adaptive Channel Access Scheme Selection for Wireless Coexistence
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Solution Overview
Problem
Future wireless systems with high gain beamforming in unlicensed spectrum bands face challenges in coexistence with existing systems like Wi-Fi and LAA due to regulatory requirements mandating LBT scheme, which limits performance, especially in high traffic scenarios and massive MIMO configurations.
Innovation Solution
A method for a network node to detect coexisting wireless systems and determine a channel access scheme as LBT, LAT, or hybrid LBT/LAT based on detected systems, allowing for adaptive channel access to support coexistence and improve spectrum reuse.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If LAT scheme is used for high gain beamforming in unlicensed spectrum, then user experience rates are improved, but coexistence with existing wireless systems is degraded
Solution Approach 1:
The patent implements dynamic channel access scheme selection that adapts between LAT and LBT modes based on detected coexisting systems and traffic conditions. The system transitions from static LAT usage to dynamic adaptation, selecting LAT for high performance when alone and LBT for coexistence when other systems are detected, thereby resolving the contradiction between productivity and adaptability.
Solution Approach 2:
The patent changes the operational parameters of channel access by switching between two distinct schemes (LAT and LBT) based on environmental conditions. This parameter change allows the system to optimize performance metrics under different operating scenarios, addressing both the high rate requirement and coexistence requirement.
2Adaptability or versatility
If LBT scheme is used to ensure coexistence with Wi-Fi and LAA systems, then coexistence capability is improved, but user experience rates are degraded
Solution Approach 1:
The system dynamically switches channel access schemes based on real-time detection of coexisting systems and traffic conditions. When traffic load is high or LAT is detected, the system uses LBT for coexistence; when traffic is low and only NR systems are present, it switches to LAT for higher performance, thus dynamically balancing coexistence and productivity.
Solution Approach 2:
The patent implements parameter changes by selecting different channel access schemes (LBT or LAT) based on detected conditions. This allows the system to adjust its operational characteristics to match environmental requirements, achieving both coexistence and performance optimization under different scenarios.
3Adaptability or versatility
If hybrid LBT/LAT scheme is used to support both coexistence and high performance, then system complexity is increased, but coexistence and performance are improved
Solution Approach 1:
The patent segments the channel access functionality into distinct LBT and LAT modes with clear selection criteria. By dividing the access mechanism into separable schemes with defined transition conditions, the system manages complexity through modular design rather than a monolithic complex algorithm, making the hybrid approach more tractable.
Solution Approach 2:
The system employs feedback mechanisms through channel detection that monitors coexisting systems and traffic conditions, then adjusts channel access scheme selection accordingly. This feedback loop enables automatic adaptation without manual intervention, managing the complexity of hybrid operation through real-time environmental awareness and responsive scheme switching.
Data Source
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AI summary
A method for channel access performed by a network node in a first wireless system is disclosed. In the method, the network node detects one or more wireless systems coexisted with the first wireless system on a channel, the channel operating on a shared spectrum. Then the network node determines a channel access scheme based on the detected one or more wireless systems. The channel access scheme may be one of listen before talk (LBT) channel access scheme, listen after talk (LAT) channel access scheme, and hybrid LBT and LAT channel access scheme. The network node performs channel access according to the determined channel access scheme. The related network node is also disclosed.