UWB Range Quality Signaling via Confidence Scaling
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Solution Overview
Problem
Current UWB radio ranging technologies face challenges in efficiently communicating the reliability of range estimates, particularly due to the lack of a parametric form for the probability density function of range estimates, leading to inefficient use of network resources and varying accuracy requirements across different applications.
Innovation Solution
Introducing a scaling factor that adjusts confidence intervals, allowing for more precise signaling of range quality indicators, which can be applied universally or adaptively based on specific link conditions or network design, reducing the need for numerous confidence intervals and improving accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple confidence intervals are defined to accommodate varying accuracy requirements, then adaptability to different applications is improved, but device complexity and overhead increase
Solution Approach 1:
The patent changes the parameter representation by introducing a scaling factor that modifies the interpretation of confidence interval values. Instead of defining multiple fixed confidence intervals for different accuracy requirements, the system uses a base confidence interval value multiplied by a scaling factor to adapt to varying accuracy needs. This reduces the number of discrete confidence interval levels needed while maintaining adaptability across different application scenarios.
Solution Approach 2:
The scaling factor mechanism serves multiple functions: it adapts confidence intervals to different accuracy requirements, reduces signaling overhead, and provides a universal solution that works across various UWB ranging applications. A single scaling factor can accommodate multiple accuracy scenarios that would otherwise require numerous distinct confidence interval definitions, making the system more universal and less complex.
2Measurement precision
If numerous confidence intervals are signaled to improve measurement precision, then range estimate accuracy is improved, but loss of information increases due to overhead
Solution Approach 1:
The patent transforms the signaling approach by changing from transmitting multiple discrete confidence interval values to transmitting a base value combined with a scaling factor. This parameter transformation reduces the number of bits required to signal range quality while preserving the ability to convey precise accuracy information through the scaled interpretation of the transmitted values.
3Device complexity
If fixed confidence intervals are used to simplify signaling, then device complexity is reduced, but adaptability to different applications deteriorates
Solution Approach 1:
The patent introduces dynamics to the confidence interval signaling by using a scaling factor that can be adjusted based on application requirements. Instead of fixed confidence interval values, the system dynamically adapts the effective confidence interval through multiplication by a scaling factor, allowing the same base signaling mechanism to serve multiple accuracy requirements without increasing complexity.
Data Source
AI summary
A method signals a quality of range estimates in a UWB network. For each range estimate, a confidence level of a range estimate is signaled, a confidence interval for the range estimate is signaled, and a confidence interval scaling factor for the confidence interval is signaled.