LAA Small Cell Clustering for Unlicensed Medium Coexistence
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Solution Overview
Problem
Licensed Assisted Access (LAA) networks face challenges in maximizing airtime share, enabling high spectral efficiency, and minimizing coexistence overhead due to high density of small cells and WLAN nodes, leading to interference and unfair coexistence.
Innovation Solution
The solution involves grouping transmission points into radio access clusters (RACs) based on soft airtime sharing, where each RAC includes a set of transmission points with a common airtime share, aligned timing, and synchronized usage of the unlicensed medium, managed by a central spectrum management control unit to optimize medium usage and reduce interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If small cells are deployed at high density to increase network capacity, then network resources and coverage are improved, but interference increases and coexistence with WLAN becomes unfair
Solution Approach 1:
The patent groups multiple small cells into clusters where cells within the same cluster synchronize their uplink transmissions to the same time resources. This merging approach allows cells to share common time resources efficiently, increasing network capacity while reducing interference through coordinated transmission timing.
Solution Approach 2:
The patent implements periodic synchronization of uplink transmissions within clusters, where cells transmit on common time resources at regular intervals. This periodic coordinated action ensures fair coexistence with WLAN by aligning transmissions in a predictable pattern that avoids random interference.
2Productivity
If small cells independently access unlicensed medium to maximize airtime share, then individual cell throughput is improved, but coexistence fairness with WLAN deteriorates
Solution Approach 1:
The patent merges multiple small cells into clusters that share common uplink time resources. By combining their access patterns, cells achieve better overall airtime utilization while maintaining fairness with WLAN through coordinated resource sharing at the cluster level.
Solution Approach 2:
The patent creates equipotential conditions by ensuring all cells within a cluster have equal access to common time resources. This equalization of resource allocation across clustered cells ensures fair coexistence with WLAN while maximizing overall airtime share for the cluster.
3Adaptability or versatility
If each small cell uses independent timing for unlicensed medium access, then individual cell flexibility is improved, but spectral efficiency and interference coordination deteriorate
Solution Approach 1:
The patent segments small cells into distinct clusters, where each cluster operates with independent timing synchronization. This segmentation allows different clusters to maintain flexibility while achieving spectral efficiency through coordinated transmission within each cluster boundary.
Solution Approach 2:
The patent combines timing synchronization for cells within the same cluster to achieve common uplink time resources. This merging of timing operations improves spectral efficiency through better resource utilization while maintaining adaptability at the cluster level.
Data Source
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AI summary
Methods and systems for managing access of a communication resource in a licensed assisted access (LAA) network. Each transmission point (TP) of a plurality of TPs provides a first set of information indicative of expected usage of a first communication resource by each TP. Information is transmitted to the TPs to cause each TP to align usage or reservation of the first communication resource with any other TP belonging to a first radio access cluster (RAC) to which the given TP belongs, the first RAC being one in a first set of one or more RACs, wherein each of the plurality of TPs belongs to a respective RAC in the first set of RACs and each RAC in the first set of RACs contains one or more TPs.