Ethernet Vehicle Network Bandwidth Reservation Method
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Solution Overview
Problem
Ethernet-based vehicle networks experience performance degradation due to the time-consuming bandwidth reservation process for frame transmission, which is not adequately supported by existing CAN and FlexRay-based networks, especially for high transmission rate requirements of telematics and infotainment systems.
Innovation Solution
A method for an Ethernet-based vehicle network communication node that transmits a first frame to advertise a data unit, receives a second frame indicating preparation for data reception, and uses a statically reserved bandwidth to transmit the data unit, with options to disable or enable bandwidth reservation through specific frames, optimizing bandwidth usage and reducing transmission delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bandwidth reservation procedure is performed before frame transmission, then bandwidth is reserved for frame transmission, but frame transmission delay increases
Solution Approach 1:
The patent applies preliminary action by performing bandwidth reservation in advance through exchange of first and second frames before actual data transmission. The reservation is established beforehand so that when data needs to be transmitted, the bandwidth is already secured, eliminating the need for real-time negotiation and reducing transmission delay.
Solution Approach 2:
The patent separates the bandwidth reservation procedure from the data transmission procedure. The reservation is handled through dedicated first and second frames exchanged between communication nodes, while data transmission occurs separately through third frames. This extraction of the reservation function allows data to be transmitted immediately without waiting for real-time bandwidth allocation.
2Productivity
If static bandwidth is reserved through frame exchange, then bandwidth usage efficiency is improved, but network complexity increases
Solution Approach 1:
The patent segments the communication process into distinct phases: bandwidth reservation phase (using first and second frames) and data transmission phase (using third frames). This segmentation allows each phase to be optimized independently - the reservation phase ensures efficient bandwidth allocation while the transmission phase focuses on data delivery, reducing overall system complexity.
Solution Approach 2:
The patent introduces control frames (first and second frames) as intermediaries that mediate the bandwidth reservation process. These intermediary frames carry reservation information and coordinates between communication nodes, separating the complex reservation logic from the simple data transmission process. This mediation simplifies the overall network operation by handling complexity in a standardized, predictable manner.
Data Source
AI summary
An operation method of a communication node in an Ethernet-based vehicle network includes: transmitting a first frame advertising a presence of a data unit to be transmitted; receiving a second frame indicating that preparation for receiving the data unit is completed; and transmitting a third frame including the data unit using a static bandwidth which is reserved through an exchange of the first frame and the second frame.