The Simulation Modeling Of Deterministic Fiber Channel Network

With the development of avionics network,industrial automation control,traffic control and in-vehicle system,the increasing requirements for multi-type service,low latency,high reliability in the network are ensured by the deterministic of network.The deterministic of network includes the deterministic of communication stream session sequences and the time deterministic.The TTE(Time-Triggered Ethernet,TTE)protocol proposed a time-triggered scheduling strategy to achieve deterministic message transmission and reception.The FCAE-1553 protocol in the FC(Fiber Channel,FC)network implements the deterministic of communication stream session sequences through the network controller.The FC network has the advantages of high bandwidth,low latency,strong compatibility,etc.The deterministic FC network adopting TT(Time-Triggered,TT)scheduling strategy is provided with the both deterministic of session message sequences and time to realize the transmission with lower latency,higher reliability and higher throughput.Currently the time-trrigered scheduling technology of FC network is still under development.In this thesis,the node simulation model architecture of FC network will be established.Each model layer and the functions are highly consistent with the actual equipments,simulating the time deterministic and the deterministic of communication stream session sequences in the FC network.The work is shown as the following.1.Apply time-triggered module to FC network protocol layer,and design the timetriggered module to interact with the rest of the protocol layer on the premise of being compatible with the traditional FC service function,to simulate the deterministic of time in FC network.2.Research of the strategy method for generating the whole network message scheduling.The process includes:(a)calculating the message cluster period in the whole network according to all the TT message periods;(b)prioritizing the TT messages,planning the shortest transmission path of each TT message;(c)detecting and equalizing link traffic load;(d)re-planning the transmission according to the overload link;(e)sorting TT messages in the cluster period without conflict;(f)generating the link message schedule table of the whole network and each node.3.Designation of network terminal model architecture and switch model architecture based on FC protocol layer and the actual FC network device.In the terminal model architecture the functions are allocated at the corresponding protocol layer.The cooperative communication transmission methods between protocol layers completed through states transition will be introduced.The deterministic of session sequence is simulated through FC-AE-1553 protocol in the session protocol layer.The configuration of port numbers of each switch node is supported.The switch node adopts polling scheduling method for each port and the buffers are set as same as the actual devices.4.Designation of the upper application interface layer.Cooperate with the node model,session contents,protocol and the time-triggered dispatch message are configured through.gdf files.The application interface layer tests the lower layer function and analyzes the test result.The above work is simulated and tested by OPNET software.It is verified that the simulation model simulates the deterministic transmission of FC network and provides simulation reference for the TT-FC network research and practice in the future.