Dynamic Energy Detection Thresholds for LBT Throughput
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Solution Overview
Problem
In wireless communication systems, especially in shared spectrum environments like LTE-U and LAA, radio nodes using 'Listen Before Talk' (LBT) face interference issues due to fixed energy detection thresholds (EDTs), which can lead to reduced throughput and signal quality.
Innovation Solution
A method for dynamically selecting and adjusting EDTs in radio nodes based on signal, noise, and interference parameters to optimize throughput, allowing radio nodes to coordinate and set optimal EDTs within radio node pairs to improve channel utilization and reduce interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a fixed energy detection threshold (EDT) is used in LBT mechanism, then the radio node can maintain simple operation and consistent detection behavior, but the throughput and channel utilization deteriorate due to inability to adapt to varying interference conditions
Solution Approach 1:
The patent applies dynamics by making the EDT adjustable and adaptable rather than fixed. The radio node dynamically selects between multiple EDT values (first EDT and second EDT) based on channel conditions, allowing the system to respond to varying interference environments and optimize throughput while maintaining manageable complexity through predefined threshold options
Solution Approach 2:
The patent changes the EDT parameter based on detected channel conditions. When the channel is determined to be in a specific state (e.g., high interference), the system switches between different EDT values to optimize detection accuracy and throughput, directly addressing the contradiction between fixed operation simplicity and adaptive performance
2Productivity
If a higher EDT is used, then the radio node can occupy the channel more frequently increasing throughput, but the signal quality deteriorates due to increased interference from neighboring nodes
Solution Approach 1:
The system dynamically adjusts the EDT based on real-time channel conditions and neighboring node activity. By monitoring the shared channel and detecting transmissions, the radio node can switch between higher EDT (for increased occupancy) and lower EDT (for better signal quality) depending on the current interference environment
Solution Approach 2:
The patent implements feedback through the LBT mechanism where the radio node continuously monitors the channel for transmissions from neighboring nodes. This feedback information is used to adjust the EDT selection, creating a closed-loop system that balances channel occupancy with signal quality based on actual network conditions
3Reliability
If a lower EDT is used, then the signal quality is improved by reducing interference from neighboring nodes, but the channel utilization deteriorates due to reduced channel occupancy time
Solution Approach 1:
The system uses dynamics to switch between lower EDT (for signal quality) and higher EDT (for channel utilization) based on detected channel conditions. The radio node adapts its EDT selection in real-time to optimize the trade-off between these two competing objectives
Solution Approach 2:
The patent changes the EDT parameter based on channel state assessment. When conditions favor aggressive access, the system uses higher EDT to maximize occupancy; when interference is detected, it switches to lower EDT to maintain signal quality, thereby optimizing overall system performance
Data Source
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AI summary
Systems and methods for dynamically selecting energy detection thresholds (EDTs) in radio nodes deploying listen before talk within a coordinated network to improve throughput on shared spectrum are disclosed. The radio nodes are configured to coordinate to deploy mechanisms to avoid or reduce interference issues, including collisions, with use of shared spectrum (e.g., unlicensed spectrum). One such mechanism is Listen Before Talk (LBT), and a radio node deploying LBT sets an EDT at which the radio node hears traffic from neighboring radio nodes on the shared spectrum. In an exemplary aspect, the EDT of radio nodes in the coordinated network of radio nodes can be dynamically selected and/or adjusted to improve throughput of the individual radio nodes and/or of the network of radio nodes as a whole.