TSN Preemptable Frame Integrity Validation
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Solution Overview
Problem
Traditional methods for measuring data integrity in Ethernet frame transmission are inadequate for Time Sensitive Networking (TSN) due to frame pre-emption, which introduces fragmentation and reassembly, and existing validation mechanisms like CRC checksums are insufficient to detect payload alterations during these processes.
Innovation Solution
Appending a data integrity value to preemptable frames, calculated before transmission, and validating it after traversal through the TSN device to ensure the frame's integrity is maintained during fragmentation and reassembly, using additional checksums like MD5 to prevent unnoticed payload changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If frame pre-emption is implemented in TSN to ensure deterministic delivery and low latency, then time synchronization and latency bounds are improved, but traditional data integrity measurement methods become insufficient due to fragmentation and reassembly
Solution Approach 1:
The patent segments the data integrity validation process into multiple components: fragment identification markers, sequence number tracking, and reassembly validation. This allows the integrity measurement to work alongside frame pre-emption fragmentation without interfering with the deterministic delivery mechanism.
Solution Approach 2:
The patent introduces an intermediary validation mechanism that operates between the fragmentation/reassembly process and the traditional CRC checksum. This intermediary layer specifically tracks payload integrity through fragmentation by comparing fragment sequences and markers, providing enhanced measurement precision without compromising the reliability of frame pre-emption.
2Ease of manufacture
If traditional CRC checksums are used for data integrity validation in Ethernet, then implementation simplicity is maintained, but payload alterations during fragmentation and reassembly go undetected
Solution Approach 1:
The patent merges the traditional CRC checksum validation with an additional fragmentation-specific validation mechanism. The system combines both approaches by validating both the overall frame CRC and the fragment sequence integrity, thereby maintaining implementation simplicity while significantly improving payload alteration detection capability.
Solution Approach 2:
The patent implements feedback mechanisms where the receiving end validates fragment sequences and compares them against expected patterns. This feedback loop detects payload alterations during fragmentation/reassembly by identifying out-of-order or corrupted fragments, while the traditional CRC provides a feedback check for overall frame integrity.
3Measurement precision
If additional validation mechanisms like MD5 checksums are appended to frames, then data integrity validation accuracy is improved, but frame processing complexity increases
Solution Approach 1:
The patent applies local quality by making the additional validation fields optional and configurable. Different network segments can implement different levels of validation based on their specific requirements. Critical segments can use MD5 checksums for maximum accuracy, while less critical segments can rely on simpler CRC validation, thus managing device complexity through selective implementation.
Data Source
AI summary
Methods, systems, and computer readable media for measuring data integrity in time sensitive networks. An example method for testing a time sensitive network (TSN) device includes calculating a data integrity value for a preemptable frame. The method includes appending the data integrity value to an end of the preemptable frame and transmitting the preemptable frame to the TSN device, causing the TSN device to fragment the preemptable frame or to reassemble the preemptable frame after fragmentation. The method includes receiving the preemptable frame after traversing the TSN device and validating the data integrity value of the preemptable frame after traversing the TSN device.