PEPS Localization Using Open and Secure Channels
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Solution Overview
Problem
Traditional PEPS systems rely on proprietary radio protocols with fixed frequencies and lack encryption, making them insecure and vulnerable to unauthorized access, as they use low-frequency signals for vehicle key location and authentication.
Innovation Solution
Implementing a localization system that uses consumer-grade wireless protocols with both open advertising channels for broadcasting and secure communication channels for secure connections, such as frequency hopping spread spectrum, to enhance security and privacy, allowing for secure communication between a vehicle and a portable device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional PEPS systems use fixed frequency LF signals for communication, then location estimation accuracy is improved, but security is worsened due to lack of encryption and vulnerability to unauthorized access
Solution Approach 1:
The communication protocol is segmented into two distinct parts: an open advertising channel for location estimation and a secure communication connection for authenticated data exchange. This segmentation allows the system to maintain location accuracy through open signals while protecting sensitive operations through encrypted channels.
Solution Approach 2:
A secure communication connection acts as an intermediary layer between the open advertising channel and the core PEPS functions. This intermediary establishes encrypted tunnels for authentic communication while allowing open channel signals to remain accessible for location estimation purposes.
2Reliability
If secure communication connections are implemented using frequency hopping spread spectrum, then security is improved, but device complexity is worsened
Solution Approach 1:
The system dynamically switches between open advertising channel mode and secure connection mode based on operational requirements. During initial pairing and location estimation, open channels are used. During authenticated operations, the system transitions to frequency hopping spread spectrum mode, optimizing security only when needed.
Solution Approach 2:
The communication system changes parameters such as frequency, modulation scheme, and encryption level based on the operational state. Open channels use simple fixed-frequency transmission for ease of use, while secure connections employ frequency hopping and encryption only when authentication is required, reducing overall complexity.
3Ease of operation
If open advertising channels are used for broadcasting signals, then ease of operation is improved, but security is worsened due to lack of encryption
Solution Approach 1:
The communication protocol is segmented into two distinct parts: an open advertising channel for location estimation and a secure communication connection for authenticated data exchange. This segmentation allows the system to maintain location accuracy through open signals while protecting sensitive operations through encrypted channels.
Solution Approach 2:
A secure communication connection acts as an intermediary layer between the open advertising channel and the core PEPS functions. This intermediary establishes encrypted tunnels for authentic communication while allowing open channel signals to remain accessible for location estimation purposes.
Data Source
AI summary
Localization systems and methods are provided and include a first sensor that wirelessly communicates with a portable device using a secure communication connection during first and third time periods and second sensors that transmit broadcast signals over an open advertising communication channel during a second time period between the first and third time periods. The second sensors transmit the broadcast signals based on timing information determined by a control module that also communicates the timing information to the portable device using the secure communication connection. The portable device establishes scanning windows for receiving the broadcast signals based on the timing information and receives first signal information about first signals transmitted over the secure communication connection and second signal information about the broadcast signals transmitted by the second sensors. The control module determines a current location of the portable device based on the first signal information and the second signal information.