UWB Ranging Period Control for Multi-Digital Key Vehicles
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Solution Overview
Problem
Conventional UWB ranging technologies face increased failure probability and channel complexity when multiple digital keys perform ranging simultaneously, leading to overlapping timing and reduced accuracy.
Innovation Solution
An apparatus and method that utilize a Bluetooth Low Energy (BLE) communication unit to receive signal intensities from multiple digital keys, setting ranging periods based on these intensities to optimize UWB ranging periods, thereby reducing failure probability and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple digital keys perform ranging simultaneously using conventional UWB technology, then ranging coverage is improved, but ranging failure probability increases due to channel complexity and timing overlap
Solution Approach 1:
The patent implements dynamic ranging period adjustment where the UWB ranging interval is adaptively changed based on BLE signal intensity measurements. When multiple digital keys are detected, the system dynamically extends the ranging period to prevent timing overlap and channel conflicts, thereby maintaining reliability while preserving multi-key coverage capability
Solution Approach 2:
The system changes the temporal parameter (ranging period) based on detected signal conditions. By measuring BLE signal intensities and adjusting the UWB ranging interval accordingly, the system optimizes the balance between coverage and failure probability without requiring hardware modifications
2Measurement precision
If UWB ranging is performed frequently to improve positioning accuracy, then measurement precision is improved, but power consumption increases
Solution Approach 1:
The patent dynamically adjusts the ranging period parameter based on BLE signal intensity thresholds. When signal intensity indicates a digital key is within the interested range, the system increases ranging frequency for accurate positioning. When out of range, it extends or suspends ranging to conserve power, achieving adaptive optimization of both precision and energy efficiency
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
The solution effectively minimizes ranging failures and power consumption by prioritizing digital keys with higher signal intensities, ensuring efficient user convenience and accurate positioning in dynamic environments.
Implementation Method 1
the UWB is a technology for calculating the distance between the subjects of communication by multiplying a signal arrival time between the subjects of communication by the speed of light by using a time of flight (ToF) technology
Implementation Method 2
a Bluetooth low energy (BLE) communication unit configured to transmit and receive data to and from multiple digital keys
Data Source
AI summary
An apparatus for setting an ultra-wide band (UWB) ranging period including a Bluetooth low energy (BLE) communication unit configured to transmit and receive data to and from multiple digital keys, a UWB communication unit configured to provide information on separation distances between the multiple digital keys and a vehicle, a memory configured to store one or more instructions, and one or more processors configured to execute the one or more instructions to perform a ranging based on the separation distances between the multiple digital keys and the vehicle and setting ranging periods for the multiple digital keys, respectively, based on signal intensities of received data of the multiple digital keys, the received data being received from the BLE communication unit.