Research On Dynamic Scheduling Mechanism Of FC Network Supporting IP And FC-AE-1553 Multi-services

The FC network has the characteristics of fast link rate and support for switching network topology.It can design corresponding scheduling modes according to different application scenarios which has important significance in the field of space communication.At present space communication faces large throughput and multiple service requirements in application.FC-AE network can guarantee the certainty of transmission service through the interaction response of protocol frames but for non-deterministic requirements.The waste time slot waste caused by the interactive response of the protocol frame and the waste of scheduling resources at the network controller so the research direction of deterministic service and non-deterministic service is considered comprehensively and the research direction of improving the throughput as high as possible is very Significant.The traditional FC bandwidth scheduling mechanism only focuses on the transmission efficiency of the FC network layer 2 regardless of the efficiency of the upper layer services it carries resulting in inefficient use of network bandwidth.Focusing on the above problems this paper studies and designs the scheduling strategy for efficiently carrying IP services and TCP/UDP services in FC networks.The main research contents and work results are as follows.1.Aiming at the problem of scheduling IP service inefficiency with deterministic scheduling mechanism on FC network this paper proposes a dynamic bandwidth allocation mechanism for FC network that determines the combination of scheduling and non-determined scheduling—the "IP and FC" scheduling mechanism.The FC-AE-1553 service and the IP service are separately scheduled by using the command-response determination scheduling and the non-deterministic scheduling of the FC flow control mechanism respectively thereby improving the efficiency of the network transmission IP service thereby improving the network throughput.2.Using OPNET software a simulation platform for FC network dynamic bandwidth scheduling mechanism was built.In the simulation platform the switch node supporting the two kinds of scheduling can be realized by designing the queue polling mechanism and rationally allocating the node cache and the proposed mechanism is used to verify the proposed mechanism.The simulation analysis shows that the network throughput is the largest when the FC-AE-1553 service and IP service time slot allocation ratio is 14 and the DBA period is set to 0.5ms which is 1.8 times higher than the "IP over FC" mechanism.3.Aiming at the problem that TCP traffic is carried over the FC network the retransmission of TCP services is caused by the fact that the Layer 2 scheduling and the TCP layer transmission are independent of each other.A FC dynamic bandwidth scheduling mechanism for sensing TCP and UDP services is proposed.The characteristics of the UDP service are scheduled using different scheduling modes.The simulation results show that under the optimal network simulation parameter setting the retransmission rate when scheduling TCP services through the deterministic scheduling mechanism is 6.44%and the retransmission rate of scheduling TCP services using non-deterministic scheduling is only 0.7%.