Serial Bus Bit Length Adaptation for Data Rate and Error Robustness
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Solution Overview
Problem
Current serial bus systems, such as CAN FD, face limitations in data transfer rates and error robustness, particularly in vehicle applications, where high data volumes and error resilience are required for autonomous systems.
Innovation Solution
A communication control device for user stations in serial bus systems that generates transmission signals with adjustable bit lengths, allowing dominant bits to be shortened in specific phases, enhancing data transfer rates while maintaining error robustness by using a bit length adaptation module to adjust bit durations based on access permissions and error conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the data transfer rate is increased in the second communication phase, then the productivity is improved, but the error robustness deteriorates due to phase errors and bit falsification
Solution Approach 1:
The patent changes the temporal parameter of bit length dynamically: dominant bits are transmitted with a first (shorter) bit length to increase data transfer rate, while recessive bits are transmitted with a second (longer) bit length to maintain error robustness. This parameter differentiation allows the system to achieve high productivity while preserving reliability through selective bit length adjustment based on bit state.
2Productivity
If the bit length of dominant bits is shortened to increase data transfer rate, then the productivity is improved, but the measurement precision deteriorates due to phase errors in reception nodes
Solution Approach 1:
The patent applies different bit length qualities to different bit states: dominant bits receive a shorter duration optimized for high-speed transmission, while recessive bits receive a longer duration optimized for reliable detection. This local differentiation allows each bit type to be optimized for its specific function, achieving high net data rate while maintaining bit detection accuracy through appropriate timing margins for recessive bits.
3Productivity
If the data volume per frame is increased, then the productivity is improved, but the loss of time increases due to longer transmission duration
Solution Approach 1:
The patent applies parameter changes to the bit length duration to enable higher data volumes to be transmitted within fixed time constraints. By shortening dominant bit durations, the system can pack more data bits into each frame without proportionally increasing transmission time, thus improving productivity while controlling time loss through efficient use of the available transmission window.
Data Source
AI summary
A communication control device for a user station. The communication control device controls a communication of the user station with at least one other user station of the bus system, and generates a transmission signal for transmission onto a bus and/or receives a signal from the bus. The communication control device generates the transmission signal according to a frame in which bits having a predetermined temporal length are provided. The communication control device generates the transmission signal so that its bits may be transmitted bus as a dominant state or a recessive state, so that the recessive state is overwritable by the dominant state. The communication control device shortens in the transmission signal at least one bit, which is to be transmitted as the dominant state, by a predetermined value in comparison to a bit that is to be transmitted onto the bus as the recessive state.