Phone-as-a-key Localization via Dynamic RSSI Threshold Adjustment
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Solution Overview
Problem
Phone-as-a-key (PAAK) systems face challenges in accurately localizing mobile devices due to signal attenuation and interference in areas with poor electromagnetic characteristics, making it difficult to set reliable thresholds for passive entry and welcome modes.
Innovation Solution
The system employs range detection sensors and vehicle-to-vehicle communication to detect objects around the vehicle, categorizing their density and adjusting RSSI thresholds accordingly, allowing for improved localization of mobile devices using personal area networks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If phone-as-a-key systems use fixed RSSI thresholds for passive entry, then the system is simple to implement, but the reliability of door priming deteriorates in areas with poor electromagnetic characteristics
Solution Approach 1:
The system dynamically adjusts the RSSI threshold based on real-time electromagnetic environment assessment. Instead of using a fixed threshold, the system evaluates signal characteristics and environmental factors to adaptively set the threshold, resolving the contradiction between simplicity and reliability by making the threshold flexible rather than static
Solution Approach 2:
The system changes the RSSI threshold parameter based on detected electromagnetic conditions. By monitoring signal strength, interference levels, and environmental factors, the system modifies the threshold parameter to maintain reliable door priming across varying electromagnetic environments
2Length of moving object
If the system increases transmission power to overcome signal attenuation, then the operable range is improved, but the energy consumption increases
Solution Approach 1:
The system dynamically adjusts transmission power based on real-time distance and environmental assessments. Instead of maintaining high power continuously, the system optimizes power levels according to actual communication needs, extending operable range while minimizing energy consumption through adaptive power management
Solution Approach 2:
The system uses feedback from signal strength measurements and environmental assessments to adjust transmission power. By continuously monitoring communication quality and adjusting power accordingly, the system extends effective range while avoiding unnecessary energy consumption in optimal conditions
3Measurement precision
If the system uses multiple wireless nodes for RSSI measurement, then the measurement precision is improved, but the device complexity increases
Solution Approach 1:
The system segments the localization function across multiple wireless nodes, with each node independently measuring RSSI and contributing to the overall localization assessment. This segmentation improves measurement precision through multiple data points while distributing system complexity across independent nodes rather than concentrating it in a single complex unit
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 enhances the accuracy of mobile device localization and adjusts RSSI thresholds based on object density, improving the reliability of passive entry and welcome mode functions in PAAK systems.
Implementation Method 1
The example sensors detect objects around the vehicle
Implementation Method 2
The example wireless nodes receive RSSI values from a mobile device
Data Source
AI summary
Method and apparatus are disclosed for phone-as-a-key localization based on object detection. An example disclosed vehicle includes sensors, wireless nodes, and a phone key unit. The example sensors detect objects around the vehicle. The example wireless nodes receive RSSI values from a mobile device. The example phone key unit determines a quantity of the objects around the vehicle. The example phone key unit also determines a first RSSI threshold based on the quantity. Additionally, in response to an average of a portion of the RSSI values satisfying the first RSSI threshold, the phone key unit primes a door of the vehicle.