On-board Communication Equipment Autonomous Time Window Scheduling
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Solution Overview
Problem
Current on-board communication systems, such as those using CAN, Arinc 429, and Arinc 629, face limitations in data exchange rates, compatibility with next-generation communication systems, and lack determinism and availability, particularly in high-speed data exchanges, necessitating a method that enhances simplification, robustness, and autonomy in data transmission.
Innovation Solution
A method where each communication equipment on an on-board device is connected via a pair of conductors, with incremental identification, allowing autonomous emission and reception modes, and prescribing local emission time windows based on incremental identification differences, ensuring disjoint and deterministic data frame transmission without dedicated equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If current fieldbus technologies (CAN, Arinc 429, Arinc 629) are used for multi-drop communication, then compatibility with existing systems is maintained, but data exchange rate and determinism are limited
Solution Approach 1:
The patent changes the fundamental parameters of the communication system by transitioning from traditional fieldbus protocols to Ethernet-based communication. This enables data exchange rates of 100 Mbps to 10 Gbps, representing a significant increase from the 10 kbps to 1 Mbps rates of conventional systems, while maintaining compatibility through standardized Ethernet interfaces
2Reliability
If dedicated intermediate network equipments (switches, IS functions) are deployed, then data exchange determinism and availability are improved, but device complexity and cost increase
Solution Approach 1:
The patent implements self-service by enabling each communication equipment to autonomously manage its own transmission timing based on its incremental identification. Each equipment calculates its emission time window independently using the formula: emission time = (current time - previous emission time) × (own ID - previous ID) + previous emission time, eliminating the need for dedicated controllers or switches while maintaining deterministic communication
Solution Approach 2:
The patent segments the communication medium access into distinct time windows assigned to each equipment based on their incremental identifications. This temporal segmentation allows multiple devices to share the same physical medium without collisions, achieving reliable data exchange without requiring intermediate network equipments
3Device complexity
If autonomous emission mode is implemented without dedicated controllers, then device complexity is reduced, but collision-free transmission and determinism become more difficult to ensure
Solution Approach 1:
The patent applies preliminary action by pre-establishing the emission time window for each equipment based on their incremental identifications before actual data transmission occurs. Each equipment is assigned a specific time window calculated from its ID relative to the previous transmitter, ensuring that transmissions are scheduled in advance to avoid collisions while maintaining autonomous operation
Solution Approach 2:
The patent implements feedback mechanisms where each equipment monitors the physical medium to detect when another equipment is transmitting. Based on this feedback, equipment can adjust its emission timing or wait for the appropriate time window, ensuring collision-free transmission while maintaining the autonomous distributed control architecture
Data Source
AI summary
The invention relates to a method for communicating data between communication equipments, where the first communication equipment (EqptN) is put into the emission mode (Xmit) for the frame (TrN) containing its identification (D_PID), while each second communication equipment (Eqpt1, EqptN+1, EqptN+x) is put into the receiving mode (Rcv), then the equipment (EqptN) is put into the receiving mode (Rcv),each equipment (Eqpt1, EqptN+1, EqptN+x) prescribes its local emission window (Ftle1, FtleN+1, FtleN+x), which is associated with its identification, during which it is put into the emission mode (Xmit) for its frame,a time of beginning (IDF1, IDFN+1, IDFN+X) of the window being a determined function, increasing with respect to a difference equal to its identification from which the identification (D_PID) is subtracted,each equipment is put into the emission mode, during which it emits its frame containing its identification during its window starting at the beginning time.