Research On Capacity Analysis And Topology Optimization For Aerospace Time-triggered Ethernet

Time-triggered Ethernet(TTE)is a new network technology combining timetriggered(TT)and event-triggered traffic.It is compatible with standard Ethernet protocol,guarantees the certainty and reliability of time-triggered traffic and has significant advantages in aerospace communication application.In this thesis,we derive a partitioned TTE network capacity analysis method,propose a compact TTE network topology optimization method,design and realize the TTE service demonstration system.In order to analyze the traffic carrying bound of time-triggered Ethernet,we derive a traffic capacity analysis method using complex network theory.By defining the ultimate data carrying capacity without congestion as the traffic capacity,we establish a network model and a traffic model according to complex network theory and traffic constraint,respectively.Then we derived the TTE network traffic capacities of TT,rateconstrained(RC)and best-effort(BE)traffics,respectively.In addition,we simulate the processes of packet generation,storage,routing and forwarding in the network,and obtain the critical number of packets to measure the limit data carrying capacity of the network.Accordingly,the influences of network growth strategy and network size on traffic capacity are analyzed.To simplify the network structure on the premise of satisfying the RC traffic delay constrain,we propose a topology optimization algorithm using minimum intermedium node deletion and hybrid strategy recovery.After obtaining the optimized compact topology,we design a double redundant topology to guateen the reliability of TT traffic.Finally,the automatic topology optimization software is developed.The simulation results show that the performance of the proposed recovery strategy is depend on the density of the network topology,showing the advantages of the hybrid strategy.For the demonstration requirement of aerospace deterministic business,we design and realize a TTE business demonstration system to illustarte the data transmission process of areospace application.The system consists of the control module,scheduling module,transmission module,business simulation module,designing database module and so on.The designed areospace traffice software can cooperate with the TTE hardware to build the demonstration testbed.