Communication Device Inverting Check Value Transmission Direction

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Solution Overview

Problem

Existing communication systems face bandwidth reduction issues due to the need for redundancy in fault detection, which compromises data transmission integrity and security, especially in bus-based systems vulnerable to fault attacks.

Innovation Solution

A communication method where payload data is transmitted without redundancy, and the redundancy data is stored in the transmitter, allowing the receiver to determine and verify the check value, thus avoiding bandwidth reduction while maintaining security through a comparison of check values.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If error-detecting codes with check words are transmitted along with data blocks, then fault detection capability is improved, but bandwidth is reduced due to overhead

Engineering Contradiction:

Improvefault detection capabilityVSAvoidbandwidth

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

Instead of transmitting check words from transmitter to receiver, the invention inverts the direction: the receiver calculates and transmits the check word back to the transmitter. This allows fault detection capability to be maintained while avoiding bandwidth reduction in the forward transmission direction, as the check word travels in the opposite direction on the same bus.

Inventive Principle:

Principle #13The other way round (Inversion)

2Reliability

If redundancy data is transmitted to detect faults, then transmission integrity is improved, but bandwidth reduction occurs

Engineering Contradiction:

Improvetransmission integrityVSAvoidbandwidth

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The invention transmits redundancy data (check word) in the opposite direction to the payload data. Payload data travels from transmitter to receiver, while the check word travels from receiver back to transmitter, enabling integrity verification without consuming forward bandwidth.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The bus system performs multiple functions using the same physical medium: it transmits both payload data and check words, but in opposite directions. This multi-functionality allows fault detection capability to be added without requiring additional dedicated bandwidth for redundancy transmission.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Measurement precision

If check word length is increased to reduce non-detection probability, then fault detection precision is improved, but overhead increases

Engineering Contradiction:

Improvefault detection precisionVSAvoidoverhead

Core Design Contradiction:

Measurement precisionVSQuantity of substance

Solution Approach 1:

By inverting the transmission direction of the check word, the invention enables high-precision fault detection (with adequate check word lengths) without imposing overhead on the forward data transmission bandwidth. The overhead exists but does not reduce the effective bandwidth for payload data.

Inventive Principle:

Principle #13The other way round (Inversion)

Data Source

PatentUS8141167B2Communication device and method of transmitting data

Publication Date: 2012.03.20 INFINEON TECHNOLOGIES AG

AI summary

A communication device for transmitting data to a communication partner device includes a transmitter for transmitting transmit data to the communication partner device, a determiner for determining a check value from the transmit data in accordance with a determination specification, a receiver for receiving a verification value from the communication partner device, and a checker configured to compare the check value with the verification value and to provide a fault indication signal as a function of the comparison.