In-Vehicle Switch Frame Duplication for Accurate VLAN Diagnosis
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Solution Overview
Problem
Existing technologies face challenges in performing frame analysis in in-vehicle networks with multiple switch devices, leading to inefficiencies and inaccuracies in frame analysis.
Innovation Solution
A switch device and in-vehicle communication system that includes a duplication unit to generate a duplicate frame for diagnosis by adding specific information to the frame, allowing accurate transmission and identification of the duplicate frame across multiple communication ports, enabling smooth and accurate frame analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If frame mirroring is performed in networks with multiple switch devices, then frame analysis capability is improved, but frame analysis accuracy deteriorates due to information loss and difficulty in identifying duplicate frames
Solution Approach 1:
The patent creates a duplicate frame by copying the original frame data and adds specific identification information (copy indicator and VLAN ID) to the duplicate frame. This allows the diagnosis device to identify and analyze the duplicate frame while preserving all original frame information, thereby improving both frame analysis capability and accuracy.
Solution Approach 2:
The patent introduces an intermediary mechanism (specific information including copy indicator and VLAN ID) that mediates between the frame switching system and the diagnosis device. This intermediary information enables the diagnosis device to distinguish duplicate frames from normal frames and accurately analyze frame transmission without disrupting the original communication flow.
2Adaptability or versatility
If duplicate frames are transmitted across multiple switch devices, then diagnostic coverage is improved, but device complexity increases due to need for frame duplication and identification mechanisms
Solution Approach 1:
The patent segments the frame identification mechanism into distinct components: a copy indicator field and a VLAN ID field. This segmentation allows each component to serve a specific function (identification and VLAN tracking respectively), making the overall system easier to implement and manage across multiple switch devices while expanding diagnostic coverage.
Solution Approach 2:
The patent makes the frame duplication mechanism universal by using standardized frame structures and VLAN ID fields that work across different switch devices and network configurations. The same duplication and identification approach can be applied regardless of the specific network topology or VLAN arrangement, reducing the need for device-specific complexity.
Data Source
AI summary
A switch device includes a plurality of communication ports; a switch unit configured to relay a frame, which has been transmitted from a function unit and to which information including an ID of a VLAN is added, to another function unit via a communication port; and a duplication unit configured to, when the diagnosis device is connected to another switch device, duplicate the frame to be relayed via a designated communication port among the plurality of communication ports, and generate a duplicate frame for diagnosis that is a frame obtained by adding, to a duplicate frame obtained through the duplication, specific information indicating that the duplicate frame for diagnosis should be transmitted to the diagnosis device. The switch unit outputs the duplicate frame for diagnosis generated by the duplication unit from a communication port corresponding to the other switch device.