TSN Communication Device Guard Band Segmentation
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Solution Overview
Problem
Existing communication efficiency techniques, such as those described in Patent Literature 1, are not effective in improving communication efficiency in in-vehicle networks where the temporal change in data transmission patterns is small.
Innovation Solution
A communication device with a receiving unit, classification unit, queueing unit, gate unit, scheduling unit, and transmission unit is implemented. The classification unit classifies frames based on data conditions and frame lengths, and the scheduling unit sets guard bands corresponding to maximum frame lengths for each class, optimizing data transmission timing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a guard band is set to the maximum frame length for each class in TSN communication, then transmission timing of other classes is ensured, but communication efficiency reduces when frames shorter than maximum length are included
Solution Approach 1:
The patent segments the guard band into two parts: a first guard band set to the maximum frame length of the current class, and a second guard band set to the maximum frame length of the next class. This segmentation allows the communication device to selectively use only the necessary portion of the guard band based on actual frame transmission needs, thereby reducing unnecessary transmission inhibition periods and improving communication efficiency while still ensuring transmission timing of other classes.
Solution Approach 2:
The patent dynamically changes the guard band parameter from a fixed maximum value to a variable value that adapts to the actual frame length being transmitted. By adjusting the guard band width based on the specific frame characteristics and the requirements of the next class, the system optimizes the balance between timing assurance and communication efficiency.
2Reliability
If individual domain-based networks are used for different communication targets, then communication quality requirements are met, but network management complexity and wiring burden increase
Solution Approach 1:
The patent implements a universal TSN communication device that can handle multiple communication quality requirements through a single unified network infrastructure. The device classifies frames into different classes and applies appropriate transmission controls, guard bands, and scheduling policies to meet diverse communication quality needs (low latency, low data loss rate, high bandwidth) without requiring separate physical networks for each domain.
Solution Approach 2:
The patent merges multiple domain-specific networks into a single TSN-based unified network. By combining the power-train/chassis system network, AD/ADAS system network, and information system network into one TSN infrastructure with class-based transmission control, the system reduces network management complexity and wiring burden while maintaining the ability to meet specific communication quality requirements for each application type.
Data Source
AI summary
A communication device includes a classification unit that classifies received frames into a plurality of classes, a queueing unit that buffers the frames for each of the classes, a gate unit that opens/closes the frames, a scheduling unit that determines the open/closed state and sets a guard band as a transmission inhibition period at a proximity of a gate open state end time, to ensure a transmission timing of another class, and a transmission unit that transmits the frame passed through by the gate unit. The scheduling unit sets a guard band width corresponding to a frame maximum length, and controls the open/closed state to ensure the guard band width.