Battery Pack RF Signature Authentication for Secure WBMS Nodes
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Solution Overview
Problem
Wireless battery management systems (WBMS) face security risks due to radio frequency (RF) communications, which can lead to malicious cyberattacks, compromising the safety and security compared to wired systems.
Innovation Solution
The implementation of a method that uses unique channel impulse response (CIR) signatures for message authentication, where the CIR characteristics of RF communication channels within a battery pack are pre-programmed and compared using metrics like Error Vector Magnitude (EVM) or machine learning algorithms to verify message authenticity, ensuring only valid nodes can communicate, and external measurement is prevented by the pack's enclosure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If wireless communication is used to eliminate wiring, then ease of operation and reduced volume are improved, but security against malicious cyberattacks deteriorates
Solution Approach 1:
The system pre-programs the unique CIR signature of each communication channel into the RF modules during manufacturing. This preliminary action enables automatic authentication before actual communication occurs, allowing the WBMS to verify message authenticity without additional hardware while maintaining security
Solution Approach 2:
The patent creates a digital copy of the physical channel characteristics (CIR signature) and stores it in memory for comparison. This copying approach allows the system to authenticate messages by comparing received signal characteristics against stored reference signatures, providing security through information rather than physical constraints
2Reliability
If message authentication using CIR signatures is implemented, then security is improved, but device complexity increases
Solution Approach 1:
The RF modules perform multiple functions: standard wireless communication and CIR-based authentication. By making the authentication mechanism universal across all communication channels in the battery pack, the system avoids adding separate dedicated security hardware, thereby limiting complexity increase while improving security
Solution Approach 2:
The system uses the inherent physical characteristics of the communication channel itself (CIR) for authentication rather than requiring external verification infrastructure. Each node authenticates messages by comparing against its own stored signature, making the security system self-contained and avoiding additional complex verification equipment
3Reliability
If unique CIR signatures are used for authentication, then security is improved, but measurement precision requirements increase
Solution Approach 1:
The system transforms the physical channel characteristics into a measurable parameter (CIR signature) that can be captured and compared. By changing the representation of channel characteristics from abstract physical properties to quantifiable signal parameters, the system enables practical measurement and comparison with sufficient precision for security authentication
Data Source
AI summary
A battery pack comprises an enclosure; a plurality of network nodes that communicate with each other inside the enclosure and that generate a unique radio frequency (RF) signature; and a special-purpose computer processor that compares an incoming channel impulse response (CIR) of the unique radio frequency (RF) signature corresponding to an incoming packet to a plurality of stored valid RF CIR signatures and executes a resemblance metric to accept or reject the incoming packet.