V2X Message Assurance Levels for Trust-Based Safety Verification
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Solution Overview
Problem
Existing V2X communication systems lack effective methods to establish trust in the reliability and integrity of messages, particularly in determining whether the transmitting entity is cybersecure, non-faulty, and operating as intended, which is crucial for safety-critical applications like emergency brake warnings, and current standards do not support differentiated assurance levels for various V2X applications.
Innovation Solution
The system introduces additional assurance levels for functional safety (FuSa) and SOTIF (Safety Of The Intended Functionality) within V2X messages by modifying authorization tickets to include fusaAssuranceLevel and sotifAssuranceLevel, allowing vehicles to verify the trustworthiness of messages based on specific application types, and encoding these levels within existing certificate formats without adding new fields.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional assurance information is added to V2X messages, then the trustworthiness and reliability of messages is improved, but the complexity of message processing and verification increases
Solution Approach 1:
The patent embeds assurance information (FuSa and SOTIF assurance levels) within existing authorization ticket structures and certificate formats. Rather than creating separate message fields or protocols, the assurance data is nested within the cryptographic certificate infrastructure that already exists in V2X systems, allowing verification to occur during standard certificate validation processes.
Solution Approach 2:
The authorization ticket structure is designed to serve multiple functions simultaneously: it provides cryptographic authentication, contains application permissions, and now also carries functional safety and SOTIF assurance level information. This multi-functionality eliminates the need for separate verification mechanisms for each type of information.
2Measurement precision
If assurance levels are differentiated for various V2X applications, then the precision of trust verification is improved, but the complexity of certificate management increases
Solution Approach 1:
The patent implements application-specific assurance levels by encoding different FuSa and SOTIF assurance values in the authorization tickets based on the specific V2X application type. Each application receives certificates with assurance levels tailored to its safety requirements, rather than using a uniform assurance level for all applications. This allows precise matching of verification strictness to application criticality.
3Ease of operation
If existing certificate formats are modified to include assurance levels, then the ease of operation is improved, but the manufacturing precision of certificate standards decreases
Solution Approach 1:
The patent extends existing certificate formats by adding new dimensional information (FuSa assurance level and SOTIF assurance level fields) to the authorization ticket structure. Rather than fundamentally redesigning the certificate format, new attributes are added to the existing cryptographic structure, maintaining backward compatibility while enabling enhanced verification capabilities.
Data Source
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AI summary
A method at an Intelligent Transportation System (ITS) Entity, the method including receiving a message from a second ITS entity, the message containing a safety assurance indication, and performing an action at the ITS entity based on the safety assurance indication. Further, an ITS Entity comprising a processor; and a communications subsystem, wherein the ITS Entity is configured to: receive a message from a second ITS entity, the message containing a safety assurance indication, and perform an action at the ITS entity based on the safety assurance indication.