LBT Energy Detection Threshold Adaptation for FR2-2 Bandwidth Fairness
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Solution Overview
Problem
Different radio access technologies (RATs) have disparate methods for determining energy detection thresholds, leading to unequal channel access opportunities in shared unlicensed spectrum, affecting fair use and efficiency in wireless communication systems.
Innovation Solution
Adapt the energy detection threshold determination based on a target listen before talk energy-sensing bandwidth, using a function of the operating channel bandwidth and a reference channel bandwidth to ensure fair and efficient channel access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If different RATs use their own methods for determining energy detection thresholds, then each RAT can optimize its own performance, but channel access fairness between different RATs deteriorates
Solution Approach 1:
The patent changes the energy detection threshold parameter from being RAT-specific to being RAT-agnostic by defining it as a function of channel bandwidth only. This allows different RATs to use the same threshold determination method (improving fairness) while still adapting to different bandwidth conditions (maintaining versatility). The threshold is calculated as EDT = -80 dBm + 10*log10(BW/MHz) where BW is the channel bandwidth, making it applicable across NR-U, WiFi, and other RATs.
2Reliability
If energy detection threshold is determined solely as a function of operating channel bandwidth, then channel access fairness between different RATs is improved, but the ability to account for reference channel bandwidth differences is lost
Solution Approach 1:
The patent segments the energy detection threshold determination into two distinct components: a RAT-agnostic component based on operating channel bandwidth (for fairness) and a RAT-specific component stored in lookup tables (for optimization). The final threshold is the minimum of these two values, allowing both aspects to coexist. This segmentation enables the system to simultaneously achieve fairness across RATs and optimization for specific RAT characteristics.
3Reliability
If a minimum of two threshold values is used (one based on operating bandwidth, one from memory), then channel access fairness is enhanced, but computational complexity and threshold determination overhead increase
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing optimal energy detection threshold values in lookup tables during system design or initialization. These pre-computed values account for various reference bandwidth scenarios and RAT-specific optimizations. During operation, the system only needs to perform a simple table lookup and comparison operation, rather than performing complex real-time calculations, thus reducing operational complexity while maintaining fairness.
Data Source
AI summary
A node configured for communication in a wireless communication network transmits, following a listen before talk process, at least one transmission within an operating channel bandwidth in response to a sensed energy in the operating channel being less than both a first energy detection threshold (EDT) value determined as a function of the channel bandwidth, and a second predetermined EDT value obtained from the node. The first EDT value is determined as the function of the channel bandwidth and further as a function of a ratio of a maximum transmitter power to an intended transmitter power, the intended transmitter power being less than or equal to the maximum power. When the intended and maximum powers are equal, the first EDT value is determined only as the function of the channel bandwidth. The second energy detection threshold value may be determined as a function of a reference channel bandwidth.