Adaptive QoS for Automotive Ethernet Latency
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Solution Overview
Problem
The existing Ethernet AVB standard for motor vehicle communication networks is inefficient in resource utilization and costly due to its rigid guaranteed maximum transmission time, leading to unnecessary memory requirements and latency, especially with varying network topologies and communication lengths.
Innovation Solution
Adapting the usage time based on network topology and resource availability, allowing data to be processed and transmitted according to actual transmission times rather than maximum guaranteed times, and dynamically adjusting quality of service classes based on queue utilization and network conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the maximum guaranteed transmission time is used for all data packets regardless of actual path length, then reliability of time-critical data transmission is improved, but memory requirements and latency increase unnecessarily
Solution Approach 1:
The patent applies dynamics by making the usage time adaptive rather than static. The sender determines usage time based on actual network conditions, path length, and queue states, allowing the system to dynamically adjust timing parameters to match real-time requirements rather than relying on fixed maximum guaranteed times
Solution Approach 2:
The patent changes the parameter of usage time from a fixed maximum guaranteed value to a dynamically determined value based on actual transmission path characteristics. This parameter change allows optimization of memory requirements and latency while maintaining reliability through adaptive timing
2Reliability
If the maximum guaranteed transmission time is used for all data packets, then reliability of time-critical data transmission is improved, but memory requirements increase
Solution Approach 1:
The patent makes memory usage dynamic by determining usage time based on actual transmission needs rather than allocating memory for the maximum guaranteed time period. This allows receivers to allocate only the necessary buffer space required for the actual transmission duration
Solution Approach 2:
The patent changes the memory allocation parameter from being based on maximum guaranteed time to being based on actual determined usage time, reducing the quantity of memory resources required while maintaining reliability
3Ease of operation
If fixed quality of service classes are used, then ease of operation is improved, but adaptability to different network conditions deteriorates
Solution Approach 1:
The patent introduces dynamics into QoS by allowing the sender to determine usage time based on actual network conditions such as path length, queue utilization, and traffic patterns. This dynamic determination maintains ease of operation through automated adaptation without requiring manual configuration of multiple fixed QoS classes
Data Source
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Figure 6~7
AI summary
The invention relates to a method for transmitting data in a packet-oriented communications network (1), in particular of a motor vehicle, with a guaranteed maximum transmission time for the data packets (8) in said communications network (1), and to a user terminal for carrying out said method. According to said method, before the data transmission (6) a specific quality of service is reserved by means of a reservation request (4) from the sender (2, T) of the data to the receiver (2, L) of the data, said reservation request (4) comprising the data rate of the data stream and the latency as parameters of the requested quality of service. Once the reservation request (4) is confirmed (5), the requested quality of service for the communication link between the sender (2, T) and the receiver (2, L) is guaranteed in the network for the data stream. In addition, the quality of service for the data stream is adjusted by the sender (2, L) on the basis of the topology of the communication network (1) and/or the resources of the communication link.