Study On Multi-service Supported Dynamic Bandwidth Allocation Mechanism For FC-AE-1553 Network

With the improvement of avionics system integrated level, the disadvantages of MIL-STD-1553B bus in transmission rate and bandwidth, allow the terminal number, real-time aspects began to appear,which puts forward higher requirements on bus transfer rate. The FC-AE-1553 protocol provides higher bandwidth, more terminals and greater information than the traditional MIL-STD-1553B bus, making it the best choice for a new generation of avionics networks. In view of the characteristics of FC-AE-1553 protocol, how to support multi-service Quality of Services (QoS ) transmission, reduce network power consumption and improve network performance is an important application problem to be solved. This paper mainly studies the dynamic bandwidth allocation mechanism of FC-AE-1553 network based on Passive Optical Network (PON) architecture and swithing architecture.The main contents and research results are as follows.1. Passive optical network of low power consumption, large throughput, simple network, highly reliability advantages has been applied in the fields of space system. To improve the FC-AE-1553 PON network bandwidth utilization and ensure multi-service QoS requirement,a multi-service QoS supported dynamic bandwidth allocation mechanism based on concurrency for FC-AE-1553 PON network has been proposed.This mechanism solves the conflict of data sharing channel existing in the network. At the same time, this mechanism adopts different bandwidth allocation policies for different services types in order to ensure the services delay. Moreover, this mechanism also searches whether there is a concurrency in uplink and downlink exchange for purpose of improving throughput. Further, the simulation results show that this mechanism meets multi-service delay requirement and the network bandwidth utilization reaches 66%.2. According to the practical application of space requirements, a dynamic bandwidth allocation mechanism of the FC-AE-1553 network is designed and simulated based on the application scenario of "determining the connection and large data block scheduling". There are four types of nodes in the network: management node, experiment node, storage node,calculation node. The storage node and calculation node do not generate data. Aiming at the special application scenario of restricting network connection distribution and network scheduling granularity, a scheduling strategy was designed. In addition, the influence of the difference between Network Controller (NC) node traffic and experiment node traffic on network performance is analyzed. The simulation results show that the network throughput and services delay are relatively better when the traffic ratio of NC node and experiment node is 1: 1.55.3. According to the practical application requirements of FC-AE-1553 carrying Internet Protocol (IP) service, an "IP service supported" of dynamic bandwidth allocation mechanism based on FC-AE-1553 network for a special application scenario with variable and short IP packet length (64Byte-1518Byte) is proposed. Otherwise,simulation verification is given and network performance is analyzed.The simulation results show that the network bandwidth utilization reaches 50%. The IP service average delay is 27 ms and the maximum delay is 89 ms.