DSI3 Bus Error Detection and Retransmission
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Solution Overview
Problem
Current data communication networks in vehicles, such as the 3rd generation Distributed System Interface (DSI3) standard, face challenges with electromagnetic interference (EMI), vibration resistance, and data rate limitations due to their unshielded single-ended signal conductor, which affects the robustness of data transmission in critical vehicle systems.
Innovation Solution
The implementation of enhanced sensing and communication methods that include graceful packet error detection and retransmission, using time-division-multiple-access (TDMA) slots and broadcast read commands (BRC) to ensure error-free data packet transmission over the DSI3 bus, with features like voltage pulse width indicative of error-free slots and optional retransmission requests.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If unshielded single-ended signal conductor is used for DSI3 bus, then device complexity and cost are reduced, but electromagnetic interference susceptibility increases
Solution Approach 1:
The data transmission is segmented into time-division-multiple-access (TDMA) slots, with each sensor assigned a specific time slot for transmission. This segmentation allows for better error detection and retransmission protocols, improving robustness against EMI without requiring shielded conductors.
Solution Approach 2:
The system performs preliminary error detection using checksums or parity bits embedded in each data packet. Before attempting to process potentially corrupted data, the receiver checks for errors and requests retransmission if necessary, preventing propagation of EMI-corrupted data.
2Productivity
If higher data rate is implemented on DSI3 bus, then communication efficiency is improved, but electromagnetic interference emissions increase
Solution Approach 1:
The system uses periodic TDMA slots for data transmission, where each sensor transmits at predetermined intervals rather than continuously. This periodic structure allows for controlled emission levels while maintaining effective data communication rates through efficient time utilization.
Solution Approach 2:
The system implements feedback mechanisms where the receiver acknowledges successful packet reception or requests retransmission. This feedback loop ensures high effective data rates by minimizing retransmissions through proper error handling, reducing the need for excessively high transmission rates that would generate more EMI.
3Reliability
If error detection and retransmission protocols are implemented, then data transmission reliability is improved, but communication time increases
Solution Approach 1:
The system applies partial error detection using checksums or parity bits rather than more extensive error correction codes. This partial action provides sufficient reliability for automotive applications while minimizing the time overhead compared to full error correction schemes.
Solution Approach 2:
When errors are detected in data packets, the system discards the corrupted packet and requests retransmission rather than attempting complex error correction. This approach maintains high reliability while minimizing time loss, as simple retransmission is faster than sophisticated error correction algorithms.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach significantly enhances the robustness of data communication by ensuring reliable data packet transmission even in noisy environments, improving the reliability of vehicle systems like Adaptive Cruise Control and autonomous driving features.
Implementation Method 1
generating a voltage pulse on a signal conductor coupled to a sensor array including one or more active sensors, the voltage pulse representing a broadcast read command (BRC)
Implementation Method 2
sending a data packet during the default TDMA slot by modulating a current on the signal conductor
Implementation Method 3
performing current sensing on the signal conductor to receive the data packet from each of the one or more active sensors
Data Source
AI summary
Methods and devices provide for enhanced robustness via graceful packet error detection and packet retransmission. One illustrative sensing method includes: generating a voltage pulse on a signal conductor coupled to a sensor array including one or more active sensors, the voltage pulse representing a broadcast read command (BRC) that defines a frame of one or more time-division-multiple-access (TDMA) slots, one slot for each active sensor to send a data packet; performing current sensing on the signal conductor to receive the data packet from each of the one or more active sensors; determining whether each said data packet is received error free; and requesting retransmission of each said data packet not received error free.