BLE Vehicle PEPS Localization for Secure Passive Entry
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Traditional PEPS systems using low-frequency radio signals face challenges in reliably communicating with key fobs beyond a few meters due to long wavelengths and power consumption limitations, leading to security vulnerabilities and inefficiencies.
Innovation Solution
A PEPS system utilizing Bluetooth Low Energy (BLE) communication with a communication gateway and sensors to establish secure connections, measure signal information, and determine the location of a portable device, enabling secure vehicle access and preventing unauthorized access through advanced authentication and security filtering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If low-frequency radio signals are used for PEPS communication, then the system can provide basic key fob authentication and vehicle access control, but the communication becomes unreliable beyond a few meters due to long wavelengths and power consumption limitations
Solution Approach 1:
The patent changes the frequency parameter of the communication signal from low-frequency (LF) to Bluetooth Low Energy (BLE) frequencies. This parameter change enables reliable communication over longer distances while maintaining acceptable power consumption levels, as BLE signals have shorter wavelengths that can be effectively transmitted and received with practical antenna sizes and power levels.
Solution Approach 2:
The patent substitutes the traditional LF radio communication mechanism with BLE wireless communication. This substitution replaces the mechanical/electrical system of LF transmission with an optimized wireless communication system that uses hopping frequencies and packet-based transmission, providing both improved reliability and reduced power consumption compared to traditional LF systems.
2Device complexity
If low-frequency radio signals are used for PEPS communication, then the system can maintain simple architecture, but the long wavelength makes it difficult to reliably communicate beyond a few meters with practical antenna sizes
Solution Approach 1:
The patent changes the frequency parameter from LF to BLE frequencies, which have wavelengths suitable for practical vehicle and key fob antenna sizes. This enables reliable communication over longer distances without requiring excessively large antennas or complex signal processing, maintaining relatively simple system architecture while dramatically improving communication reliability.
3Ease of operation
If traditional PEPS systems use key fob advertising and authentication, then basic access control is provided, but the system becomes vulnerable to injection attacks and security breaches
Solution Approach 1:
The patent introduces multiple intermediary security layers including encrypted communication channels, authentication protocols, and a security filtering module that validates BLE packets. These intermediaries protect the authentication process between the key fob and vehicle, maintaining ease of operation while defending against injection attacks by verifying the authenticity and integrity of communication packets.
Solution Approach 2:
The patent implements preliminary security measures including pre-established encryption keys, authentication credentials, and a security filtering module that proactively identifies and blocks suspicious packets before they can compromise the system. This preliminary anti-action prevents injection attacks rather than reacting to them after occurrence.
4Measurement precision
If BLE communication is implemented with multiple sensors eavesdropping on connections, then accurate location determination and secure authentication are achieved, but the system complexity increases
Solution Approach 1:
The patent segments the localization function across multiple distributed sensors throughout the vehicle rather than using a single centralized system. Each sensor independently monitors BLE signals and provides measurement data, which are then processed to determine key fob location. This segmentation improves measurement precision through spatial distribution while managing complexity by assigning specific functions to individual sensors.
Solution Approach 2:
The patent implements a modular architecture where the BLE communication gateway and sensors serve multiple functions: authentication, encryption, location determination, and security filtering. This multi-functionality reduces overall system complexity by consolidating capabilities into shared components rather than requiring separate dedicated systems for each function.
Data Source
AI summary
Systems and methods for localization and passive entry/passive start (PEPS) systems for vehicles are provided. A communication gateway in a vehicle configured to establish a Bluetooth low energy (BLE) communication connection with a portable device. Sensors are configured to measure signal information about a communication signal sent from the portable device. A localization module is configured to receive the signal information from the sensors and determine a location of the portable device based on the signal information. A passive entry/passive start (PEPS) system is configured to receive the location of the portable device from the localization module and perform a vehicle function including at least one of unlocking a door of the vehicle, unlocking a trunk of the vehicle, and allowing the vehicle to be started based on the location of the portable device. Each of the plurality of sensors are synchronized.