Simulation Research On Time-Triggered Ethernet And Time-Sensitive Networking

Traditional Ethernet only provides Best-Effort(BE)services,but does not guarantee service certainty and reliability.Time-Triggered Ethernet(TTE)and Time-Sensitive Networking(TSN)are used as typical Deterministic networks(DN).Based on the traditional Ethernet,a series of mechanisms are introduced,such as clock synchronization,fault tolerance,etc.,to make up for the defect of the traditional Ethernet in the deterministic,so as to ensure the transmission of key services with low delay and high reliability,which is currently the research hotspot of avionics system,industrial control,vehicle network.Simulation can complete the module level modeling of network equipment at a low cost,accurately simulate the behavior of network equipment,and intuitively display the performance indicators of the network,so as to help researchers to verify and analyze the protocol state,functional characteristics,etc.,and play an important role in the process of feasibility analysis and promoting the implementation of technology.To this end,based on OPNET simulation platform,this thesis carried out the following work around TTE and TSN:1.Study and analyze SAE AS6802 protocol,design the simulation model of TTE node and switch based on the airborne communication background,in which the time synchronization module is strictly consistent with the protocol state machine,and complete the analysis and verification of network time synchronization and TT service.2.Study and analyze IEEE 802.1AS,IEEE 802.1Qbv,IEEE 802.1Qci,IEEE802.1CB protocol,and propose a high approximation FPGA simulation model of TSN switch,including time granularity,support Cut Through(CT),etc.The related features of TSN are verified by protocol-by-protocol analysis.The results show that the TSN switch can ensure the transmission of time-sensitive traffic with high reliability and low delay,and can effectively prevent the adverse impact of malicious traffic and large-scale burst traffic on the network.3.In view of the fault scenario,a software-defined fault model is proposed,which enables the developer to easily construct multiple fault scenarios according to the requirements on the premise of shielding the working mechanism of the test object,and inject multiple different types of faults into a simulation,thus simplifying the simulation of faults.This thesis takes typical faults in TTE as an example to analyze and verify the feasibility of the model.4.TTE and TSN are compared from two aspects of time synchronization reliability and their respective advantages and disadvantages.