高级在轨系统中自相似业务流的多路复用研究

发布时间：2018-03-27 05:17

本文选题：自相似　切入点：AOS　出处：《沈阳理工大学》2015年硕士论文

【摘要】：随着航天技术的迅猛发展,高级在轨系统(Advanced Orbiting System,AOS)在航天领域的影响与日俱增,空间任务的数据传输和管理体系也愈渐复杂,目前有大量研究表明任何类型的网络流量均呈现自相似特性,故本文对高级在轨系统中自相似业务流下的多路复用进行研究。首先,对网络中普遍存在的自相似性进行详尽的分析。主要对自相似流量的业务模型和生成方法进行研究,并利用Matlab软件对典型的自相似业务流量生成方法进行仿真。其次,对帧生成过程中性能参数的理论公式进行研究推导。选择合理的自相似业务流量模型,建立新型源包到达模型,在该模型下进一步推导包信道复用中帧生成过程的性能参数理论公式,包括等时帧生成算法的MPDU复用效率、平均包时延的理论公式以及高效率帧生成算法的平均帧生成时间、平均包时延的理论公式,利用该推导思想简化泊松流下的相应性能参数的推导过程,并分别给予仿真验证。仿真结果表明各个理论公式曲线与Matlab仿真曲线能够良好地拟合,有力地验证了理论公式推导的正确性以及推导思想的合理性。最后,对两种虚拟信道调度算法在AOS中自相似业务流下的第二级多路复用的性能表现进行仿真对比分析。选择传统动态优先级调度算法和具有广泛适用性的边界可移动虚拟信道调度算法进行仿真分析,将两种算法在各虚拟信道平均调度时延、各虚拟信道最大时延、系统平均调度时延、系统最大时延、信道利用率方面进行对比,仿真结果表明,在自相似业务流量下,具有广泛适用性的边界可移动虚拟信道调度算法较之传统动态优先级调度算法在调度时延性能及信道利用率方面仍然具有优越性,并说明具有广泛适用性的边界可移动虚拟信道调度算法亦适合自相似业务流量模型的AOS虚拟信道调度研究。
[Abstract]:With the rapid development of spaceflight technology, Advanced Orbiting system (AOS) is becoming more and more important in the field of spaceflight, and the data transmission and management system of space mission is becoming more and more complicated. At present, a large number of studies show that any type of network traffic is self-similar, so this paper studies multiplexing under the flow of self-similar services in advanced orbiting systems. The common self-similarity in the network is analyzed in detail. The traffic model and generation method of self-similar traffic are studied, and the typical self-similar traffic generation method is simulated by using Matlab software. Secondly, The theoretical formula of performance parameters in frame generation process is studied and deduced. A new source packet arrival model is established by selecting a reasonable self-similar traffic model. Under this model, the theoretical formulas of the performance parameters of frame generation in packet channel multiplexing are derived, including the MPDU multiplexing efficiency of the isochronous frame generation algorithm, the theoretical formula of average packet delay and the average frame generation time of the high efficiency frame generation algorithm. The theoretical formula of average packet delay is used to simplify the derivation process of the corresponding performance parameters under Poisson flow, and the simulation results show that each theoretical formula curve can fit well with the Matlab simulation curve. The correctness of the derivation of the theoretical formula and the reasonableness of the deducing idea are verified forcefully. Finally, The performance of two virtual channel scheduling algorithms under self-similar traffic flow in AOS is compared and analyzed by simulation. The traditional dynamic priority scheduling algorithm and the widely applicable boundary moveable algorithm are selected. The virtual channel scheduling algorithm is simulated and analyzed. The two algorithms are compared in terms of the average scheduling delay of each virtual channel, the maximum delay of each virtual channel, the average scheduling delay of the system, the maximum delay of the system, and the channel utilization. The simulation results show that, in the case of self-similar traffic, Compared with the traditional dynamic priority scheduling algorithm, the boundary mobile virtual channel scheduling algorithm, which is widely applicable, still has advantages in scheduling delay performance and channel utilization. It also shows that the boundary mobile virtual channel scheduling algorithm is suitable for AOS virtual channel scheduling based on self-similar traffic model.
【学位授予单位】：沈阳理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：V443.1;V556

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