基于M/M/1模型的网络及时可靠性加速模型

网络任务周期普遍较长,为了有效暴露网络传输延迟故障,可靠性试验时间往往是其任务周期数倍,否则会造成样本数量少、试验结果置信度低的问题.为此,针对通信网M/M/1排队模型,分析其延迟故障机理,应用相似理论推导建立了及时可靠性相似准则,得到了加速模型,并应用OPNET仿真平台对其进行了验证,分别阐述了数据到达强度不变和变化两种情况下该模型的应用方式,仿真结果表明正常应力作用下的原始网络和短时高应力作用下的相似网络及时可靠性误差小,且加速模型的效用不随故障阈值、应力增加倍数变化.

Accelerated model for network reliability for M/M/1 model

Testing is a very important way to identify network reliability. However, the mission cycle of networks is usually long. In order to expose network transmission delay failure effectively, reliability testing time is often several times of its mission cycle, otherwise it will bring the problem of both sample size too small and confidence too low. In order to solve this problem, the delay failure mechanism for M/M/1 queuing model was analyzed, the reliability similar criteria was derived based on similarity theory, and the accelerated model was established. This accelerated model was verified based on OPNET simulation platform, and the application method when data arriving intensity changes and does not change was described respectively. The results show that the reliability error for original network under normal stress and similar network under short-term high stress is very small, and the effectiveness of the accelerated model does not change with the failure threshold and stress increase times.