Daisy Chain Communication Frame Collision Avoidance
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Solution Overview
Problem
Existing communication systems employing daisy chain connections face challenges in avoiding frame collisions when using paths in both directions, leading to inefficiencies and potential data loss.
Innovation Solution
A communication system comprising a daisy chain-connected group of communication devices with first and second ports, and a communication interface that transmits specific frames to control frame transfer based on identifiers or transfer limits, ensuring that frames are not transferred by devices designated to limit frame transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If frames are transmitted in both directions of a daisy chain connection, then communication efficiency is improved, but frame collisions occur
Solution Approach 1:
The patent segments the daisy chain communication path into two separate directional paths (first direction and second direction). Each path is independently controlled with dedicated frame transmission, preventing frame collisions by ensuring that frames traveling in opposite directions do not interfere with each other on the same communication medium.
Solution Approach 2:
The patent extracts the frame transfer limiting function from the individual communication devices and centralizes it in a specific communication device designated to control frame transfer. This device inserts transfer limit information into frames and enforces directional transmission rules, separating the control logic from the general communication process.
2Reliability
If frame transfer is controlled by designated devices, then frame collision is avoided, but communication device complexity increases
Solution Approach 1:
The patent applies local quality by designating only one specific communication device in the daisy chain to perform the frame transfer limiting function, rather than requiring all devices to implement complex control logic. This single device inserts transfer limit information and enforces directional transmission, while other devices simply follow the established rules, thereby minimizing overall system complexity.
3Speed
If communication paths are used in both directions, then communication speed is improved, but frame collision risk increases
Solution Approach 1:
The patent introduces an intermediary mechanism in the form of transfer limit information inserted by a designated communication device. This intermediary control element mediates frame transmission by specifying which devices should transfer frames and in which direction, thereby enabling high-speed bidirectional communication while preventing frame collisions through centralized coordination.
Data Source
AI summary
On receipt of a first frame, each of a plurality of communication devices transfers the first frame through a second port in a case in which it has recognized itself as not being a first communication device based on first information, and does not transfer the first frame in a case in which it has recognized itself as being the first communication device. On receipt of a second frame, each of the plurality of communication devices transfers the second frame through the first port in a case in which it has recognized itself as not being a second communication device based on second information, and does not transfer the second frame in a case in which it has recognized itself as being the second communication device.