Digital Key Localization via Multi-Anchor Channel Sounding Handover
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Solution Overview
Problem
Bluetooth LE Channel Sounding (CS) for secure car access requires high memory and processing time due to multiple connections for trilateration, and traditional methods like RSSI and AoA/AoD lack accuracy for precise digital key positioning.
Innovation Solution
Utilizing multiple vehicle anchors connected via a communication bus for seamless connection handovers, reducing memory and processing requirements by maintaining only one Bluetooth LE connection, and employing differential anchor sequencing and trilateration to determine the digital key's location accurately.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple Bluetooth LE connections are maintained for trilateration with multiple anchors, then accurate position determination is achieved, but memory requirements and processing time increase significantly
Solution Approach 1:
The vehicle system acts as an intermediary that collects distance measurements from multiple anchors and performs trilateration calculations centrally. The digital key only needs to maintain one Bluetooth LE connection and communicate with the vehicle, which handles the complex multi-anchor coordination and position computation, thereby reducing the digital key's memory and processing requirements while maintaining accurate position determination
Solution Approach 2:
Multiple distance measurements from different anchors are merged and processed through a unified trilateration algorithm implemented in the vehicle system. Instead of requiring the digital key to independently manage multiple connections and perform separate calculations, the system combines all measurement data and computes the position in a single integrated process
2Measurement precision
If CS procedures are performed with multiple anchors for accurate localization, then position accuracy improves, but bandwidth usage and data transfer requirements increase
Solution Approach 1:
The system extracts only the essential distance measurement data from each CS procedure and transmits minimal information between the digital key and vehicle. The vehicle system retains and processes the raw measurement data from multiple anchors, extracting position information without requiring large data transfers, thereby reducing bandwidth usage while maintaining positioning accuracy
Solution Approach 2:
The system performs CS procedures with multiple anchors (excessive action) but only processes and transmits the necessary position result (partial action). The vehicle system conducts more measurements than strictly needed for basic positioning to ensure accuracy, then extracts and communicates only the essential position information, reducing overall data transfer requirements
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
This approach minimizes bandwidth and memory usage while ensuring accurate digital key positioning with reduced processing time, enabling efficient vehicle access and potential applications in asset tracking and indoor wayfinding.
Implementation Method 1
CS uses phase-based ranging and improves distance measurement accuracy down to the order of tens of centimeters
Data Source
AI summary
A method for Channel Sounding (CS) localization with multiple vehicle anchors includes performing a CS procedure to generate a first remote data at a digital key and a first local data at a first one of a plurality of anchors. A first distance between the digital key and the first anchor is determined from the first remote data received from the digital key and the first local data. A connection handover from the first anchor to a second one of a plurality of anchors is performed. The CS procedure is performed to generate a second remote data at the digital key and a second local data at the second anchor. A second distance between the digital key and the second anchor is determined from the second remote data received from the digital key and the second local data. A location of the digital key is trilaterated using at least the first distance and the second distance.