Vehicle UWB Anchor Receiving Window for Ranging Reliability
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Solution Overview
Problem
UWB communication in vehicles is hindered by metal vehicle bodies obstructing signal transmission, leading to repeated failures and increased power consumption due to clock errors between smartphones and UWB anchors.
Innovation Solution
Adjust the receiving window of UWB anchors based on the number of ranging failures to enhance success probability and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the receiving window length is increased to compensate for clock errors and improve UWB ranging success probability, then the ranging reliability is improved, but the power consumption increases
Solution Approach 1:
The receiving window length is made dynamic rather than fixed. The system automatically adjusts the window length based on the number of reception failures: extending the window when failures occur to accommodate clock deviations, and reducing it when ranging succeeds to minimize power consumption. This dynamic adaptation resolves the contradiction between reliability and energy use.
Solution Approach 2:
The system changes the parameter of receiving window length based on operational conditions. By monitoring reception failure counts and adjusting the window length parameter accordingly, the system optimizes the balance between capturing successful ranging signals (reliability) and minimizing unnecessary reception periods (power consumption).
2Measurement precision
If the receiving window is extended to account for clock deviations between smartphone and UWB anchor, then the time synchronization is improved, but the waiting time and power consumption increase
Solution Approach 1:
The receiving window duration is dynamically adjusted based on actual ranging outcomes. When ranging succeeds, the window is reduced to minimize waiting time. When failures occur indicating clock deviation issues, the window is extended to improve time synchronization coverage. This dynamic approach balances synchronization precision with time efficiency.
3Adaptability or versatility
If multiple UWB anchors are installed in the vehicle to improve ranging coverage, then the ranging availability is improved, but the device complexity and power consumption increase
Solution Approach 1:
The system segments the UWB anchor deployment into strategic locations within the vehicle (front bumper, rear bumper, side mirrors) rather than uniform distribution. This segmentation provides adequate ranging coverage while minimizing the total number of anchors needed, thus reducing system complexity and power consumption while maintaining adaptability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Increases UWB ranging success while minimizing power consumption by dynamically adjusting the receiving window in response to failure counts.
Implementation Method 1
UWB communication technology calculates a distance between communication subjects by multiplying a signal arrival time between the communication subjects by a speed of light by utilizing time of flight (ToF) technology of signals
Data Source
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AI summary
A method for an ultra-wide band (UWB) anchor device for adjusting a receiving window for waiting to receive a message transmitted from a user terminal to perform UWB ranging. The method includes setting a length of the receiving window to an initial value, counting a number of reception failures of the message until the message is received, and performing the UWB ranging based on the length of the receiving window being set to the initial value or adjusting the initial value, based on the number of reception failures.