Real-time performance evaluation in WDM networks for avionics
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摘要: 对航空电子波分复用(WDM,Wavelength Division Multiplexing)网络实时性评估问题,采用网络演算理论,提出了一种周期消息在WDM复杂虚拓扑上多跳端对端最大延迟的计算方法.建立了波长路由器WDM网络模型,分析了消息流端对端延迟的组成部分.针对网络演算理论下的WDM网络通信模型,推导了消息经单节点和多节点波长路由器的最大延迟的计算公式.并结合实际航空电子系统对公式进行了修正,解决了突发度过大的问题.最终得到最大延迟的紧密上限.最后在OPNET仿真环境下验证了计算分析方法的有效性.Abstract: To solve real-time performance evaluation problem in avionics wavelength division multiplexing (WDM) network, a method of end-to-end maximum delay calculation during multihop period message transmitting in WDM virtual topology was provided, based on network calculus analysis theory. A network model of the wavelength routing WDM networks was built, and then the composed parts of the end-to-end delay were analyzed. Concerning the communication model of the wavelength routing WDM networks based network calculus analysis theory, a concisely analytical expression was derived for message maximum delay passing through single and multiple wavelength routers. And then treatments of the expression which resolving the problem of the overextended burst were modified to obtain the closed upper bound of maximum delay according to the actual system of avionics. Finally, the evaluated method was testified by the simulation results on OPNET.
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Key words:
- wavelength division multiplexing /
- avionics /
- network performance /
- real time systems
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