Vehicle Network Count-Value Synchronization via Broadcast

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Solution Overview

Problem

The existing message checking methods in communication networks, such as those using CANs in vehicles, face inefficiencies due to the high load caused by multiple reception nodes inquiring and matching transmission count values, leading to reduced communication speed.

Innovation Solution

A communication network system where a transmission node periodically broadcasts a count-value notification frame to connected reception nodes, allowing for efficient sharing and synchronization of count values using encrypted count values and MACs, eliminating the need for multiple inquiries and reducing the load on the network.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If multiple reception nodes carry out a process of inquiring transmission count values, then message authentication can be performed, but the burden of load on the CAN increases and communication speed decreases

Engineering Contradiction:

Improvemessage authenticationVSAvoidcommunication speed

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The transmission node performs preliminary action by proactively notifying reception nodes of its transmission count value through broadcast messages. This eliminates the need for reception nodes to inquire about count values, as the information is already available when needed for MAC verification, thus resolving the contradiction between authentication reliability and communication speed

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The broadcast notification mechanism serves multiple reception nodes simultaneously with a single transmission. One broadcast message from the transmission node can be received and utilized by multiple reception nodes, reducing the total number of communication exchanges required and improving overall communication efficiency while maintaining authentication capability

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentEP3432511B1Communication network system, vehicle, counter-value notification node, counter-value sharing method, and computer program

Publication Date: 2023.05.03 KDDI CORP

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AI summary

A communication network system, in which a transmission node for transmitting a message is connected to a reception node for receiving the message, is configured to periodically transmit a count-value notification message to notify a count value, which is used to generate and check a message authentication code for the message, to the transmission node and the reception node.