Simulation and Analysis of Multiple Traffic Time-Triggered Ethernet based on OMNeT++

Abstract

Avionics full-duplex switched Ethernet (AFDX), as the backbone network in civil avionics systems, can transmit event-based device messages. However, with the increase in real-time business requirements of avionics systems, numerous key data need to use clock synchronization at the sender to comprehensively schedule flows of different trigger mechanisms, and expand the high-bandwidth communication architecture to meet Quality of Service (QoS). This paper use OMNeT++ simulator to establish the End System (ES) and switch network topology which adopts clock synchronization on the basis of Time-Triggered Ethernet (TTE). We first simulate the End-to-End Delay of Rate Constrained traffic for each Virtual Link (VL) and compare simultaneously other two approaches to limit the End-to-End latency of AFDX, the results show that the Network Calculus (NC) and Trajectory Approaches (TA) increase in pessimism in most cases. Then we expand the Gigabit network topology of each message scheduling communication paradigm, compared with the traditional AFDX scheduling strategy, and verify that table scheduling can solve Sequence Number (SN) inversion to a certain extent. The experimental results also show that the table scheduling strategy based on time reservation can not only provide time triggered traffic planning establishes transfers to ensure low latency and minimal jitter, while also reducing worst-case end-to-end latency for Rate-Constrained (RC) and Best-Effort (BE) flows.