Relay Device Frame Routing for Time Synchronization
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Solution Overview
Problem
In in-vehicle communication systems, the varying transfer delay time of time synchronization frames due to queue accumulation in relay devices hinders accurate time synchronization between units.
Innovation Solution
A relay device is configured with a queue system that accumulates and transfers non-specific frames while immediately transferring specific frames, such as time synchronization frames, to minimize delay variation by preventing them from being queued.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the relay device accumulates all received frames in a queue, then the buffer capacity is utilized efficiently, but the transfer delay time of specific frames (time synchronization frames) varies and increases
Solution Approach 1:
The patent segments the frame processing into two distinct paths: a queue-based path for general frames and a direct transfer path for specific frames (time synchronization frames). This segmentation allows different frames to be handled differently, preventing time synchronization frames from experiencing queue accumulation delay while maintaining efficient buffer utilization for other frames.
Solution Approach 2:
The patent extracts time synchronization frames from the general frame queue and processes them separately through direct transfer. By taking out these specific frames from the accumulation queue, the system eliminates the variable delay caused by queue positioning while preserving the benefits of queue-based processing for other frame types.
2Loss of time
If the relay device immediately transfers all received frames, then the transfer delay time is minimized, but the buffer capacity is wasted and system complexity increases
Solution Approach 1:
The patent applies local quality by treating different frame types differently based on their characteristics. Time synchronization frames receive direct transfer treatment (low delay requirement), while other frames undergo queue-based processing (flexibility requirement). This localized differentiation optimizes performance for each frame type without requiring complete system redesign.
Solution Approach 2:
The patent implements dynamic frame handling where the relay device determines the appropriate processing path based on frame type identification. The system dynamically switches between direct transfer and queue-based processing depending on whether the frame is a time synchronization frame or other type, optimizing performance adaptively.
3Device complexity
If the relay device uses a simple queue for frame accumulation, then the device complexity is low, but the time synchronization accuracy deteriorates due to variable transfer delay
Solution Approach 1:
The patent segments the frame processing into two distinct paths: a queue-based path for general frames and a direct transfer path for specific frames (time synchronization frames). This segmentation allows different frames to be handled differently, preventing time synchronization frames from experiencing queue accumulation delay while maintaining efficient buffer utilization for other frames.
Solution Approach 2:
The patent introduces an intermediary mechanism (frame type determination unit) that identifies time synchronization frames and routes them to the direct transfer path. This intermediary layer adds minimal complexity while enabling precise time synchronization by separating critical frames from general frame processing.
Data Source
AI summary
A relay device accumulates received frames that are not determined as a specific frame in a queue and transfers the frames accumulated in the queue one by one according to a predetermined rule. The relay device transfers a received frame that is determined as a specific frame priority to the frames accumulated in the queue without accumulating the specific frame in the queue.