Common Energy Detection Threshold for LBT Fairness
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Wireless communication networks face interference and fairness issues when multiple radio access technologies share the same communication channel, leading to inefficient spectrum access and increased latency due to differing energy detection thresholds and access deferral procedures.
Innovation Solution
Implementing a common energy detection threshold for all radio access technologies with additional access deferral procedures, including reduced contention window sizes and increased maximum channel occupancy times, to ensure fair and efficient access to shared communication channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If different radio access technologies use different energy detection thresholds and access deferral procedures, then each technology can optimize its own access performance, but spectrum access fairness deteriorates and interference increases
Solution Approach 1:
The patent changes the energy detection threshold parameter from technology-specific values to a common value shared by all radio access technologies. This parameter change ensures that all technologies detect energy levels uniformly, preventing any single technology from having unfair advantage and reducing harmful interference caused by threshold mismatches.
Solution Approach 2:
The patent creates equipotential conditions for spectrum access by establishing a common energy detection threshold that places all radio access technologies on an equal footing. This ensures that no technology has an inherent advantage or disadvantage in detecting channel occupancy, thereby achieving spectrum access fairness and reducing interference through equalized detection capabilities.
2Object-affected harmful factors
If a common energy detection threshold is used for all radio access technologies, then spectrum access fairness improves, but access latency increases due to additional access deferral procedures
Solution Approach 1:
The patent applies local quality by introducing technology-specific compensating parameters (such as adjusted contention window sizes or deferral period modifications) that are tailored to each radio access technology's characteristics. This allows the system to maintain a common energy detection threshold for fairness while providing localized adjustments that compensate for additional deferral procedures, thereby reducing access latency for specific technologies without compromising overall fairness.
3Object-affected harmful factors
If additional access deferral procedures are implemented, then spectrum access fairness improves, but channel access efficiency deteriorates
Solution Approach 1:
The patent implements partial deferral procedures by selectively applying access deferral only when necessary to ensure fairness, rather than requiring full deferral for all technologies. This partial action approach maintains spectrum access fairness by deferring access only when detected energy levels indicate potential conflicts, while avoiding excessive deferral that would unnecessarily reduce channel access efficiency.
Data Source
AI summary
Technology-specific listen before talk (LBT) parameter adjustments are disclosed for common energy detection (ED) thresholds. Some of the technologies sharing access to the same shared communication spectrum include additional access deferral procedures. Such technologies may be configured with additional compensating features to increase the likelihood of fairness in spectrum access across all technologies sharing a common ED threshold. Such additional compensating features may include a reduced contention window size relative to the technologies that do not include such additional access deferral procedures, increased maximum channel occupancy times (COTs) for longer transmissions, and the like. Each such additional compensating feature may be available under different circumstances, such as always available or available in response to the node activating one of the additional access deferral procedures. Additionally, such additional compensating features may, once initiated, be active and available for a predetermined period of time.