Ethernet Head Node Dynamic Bus Cycle Optimization
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Solution Overview
Problem
The 10 Mbit/s Ethernet bus standard in automotive applications faces challenges in efficient software flashing and diagnostic queries due to limited data rate and parallel transmission constraints, where each node can only transmit one frame per cycle, leading to decreased bandwidth for the head node as the number of subscribers increases, and existing solutions do not adequately address these issues.
Innovation Solution
A method that dynamically adjusts the bus cycle to meet the bandwidth requirements of the head node by calculating necessary bandwidth allocation, optimizing the beacon cycle time based on data size and current bus utilization, without interfering with other nodes, allowing for more efficient data transmission and reducing flash time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the 10 Mbit/s Ethernet bus standard is used in automotive applications with multiple subscriber nodes, then the network can be implemented cost-effectively with simplified hardware, but the bandwidth available to the head node decreases as the number of subscribers increases
Solution Approach 1:
The patent implements dynamic adjustment of the beacon cycle time based on the number of subscriber nodes. The head node calculates the optimal beacon cycle time using the formula T_beacon = T_min + (N-1) × T_slot, where N is the number of subscribers. This dynamic parameter adjustment allows the system to adapt the bus cycle duration to the actual number of active nodes, optimizing bandwidth utilization while maintaining cost-effective 10 Mbit/s Ethernet infrastructure.
2Reliability
If the standard Ethernet bus cycle is used without optimization, then all nodes can communicate according to the standard protocol, but the software download time becomes excessively long due to limited data rate and parallel transmission constraints
Solution Approach 1:
The patent changes the time parameter of the beacon cycle to optimize software flashing operations. By dynamically adjusting the beacon cycle time based on the number of subscribers and prioritizing the head node's transmission needs, the system reduces software download time while maintaining protocol compatibility. The head node can allocate more time slots within the optimized bus cycle for its own transmissions, thereby accelerating firmware updates without violating Ethernet standards.
3Reliability
If each node transmits only one frame per cycle according to the standard, then collision avoidance is achieved in MultiDrop mode, but the head node's transmission efficiency decreases when multiple subscribers are present
Solution Approach 1:
The patent segments the bus cycle into distinct time slots, with the head node being able to utilize multiple slots within a single bus cycle for software flashing operations. The bus cycle is divided into T_beacon + N × T_slot, where the head node can transmit during the beacon period and potentially during additional slots. This segmentation allows the head node to achieve higher transmission efficiency while other nodes maintain the one-frame-per-cycle constraint for collision avoidance.
Data Source
AI summary
A method for rapidly flashing sensor nodes via an Ethernet network having a head node and a plurality of associated nodes. The method includes: determining the number of active nodes by a head node; classifying the identified nodes into multiple classifications to prioritize the Ethernet network communication by the head node; receiving reservation requests from at least some of the plurality of nodes by the head node; assigning to one or more nodes in the upcoming communication window time slots in response to reservation requests based on a node priority and the priority assigned to the nodes in accordance with their classification. A necessary download data rate is then determined and, a current bus utilization is ascertained by calculating the time difference of a final beacon and the number of nodes, and the bus cycle of the Ethernet network is optimized in terms of the necessary download data rate.