本文選題：自相似　切入點：AOS　出處：《沈陽理工大學(xué)》2015年碩士論文

【摘要】：隨著航天技術(shù)的迅猛發(fā)展,高級在軌系統(tǒng)(Advanced Orbiting System,AOS)在航天領(lǐng)域的影響與日俱增,空間任務(wù)的數(shù)據(jù)傳輸和管理體系也愈漸復(fù)雜,目前有大量研究表明任何類型的網(wǎng)絡(luò)流量均呈現(xiàn)自相似特性,故本文對高級在軌系統(tǒng)中自相似業(yè)務(wù)流下的多路復(fù)用進行研究。首先,對網(wǎng)絡(luò)中普遍存在的自相似性進行詳盡的分析。主要對自相似流量的業(yè)務(wù)模型和生成方法進行研究,并利用Matlab軟件對典型的自相似業(yè)務(wù)流量生成方法進行仿真。其次,對幀生成過程中性能參數(shù)的理論公式進行研究推導(dǎo)。選擇合理的自相似業(yè)務(wù)流量模型,建立新型源包到達模型,在該模型下進一步推導(dǎo)包信道復(fù)用中幀生成過程的性能參數(shù)理論公式,包括等時幀生成算法的MPDU復(fù)用效率、平均包時延的理論公式以及高效率幀生成算法的平均幀生成時間、平均包時延的理論公式,利用該推導(dǎo)思想簡化泊松流下的相應(yīng)性能參數(shù)的推導(dǎo)過程,并分別給予仿真驗證。仿真結(jié)果表明各個理論公式曲線與Matlab仿真曲線能夠良好地擬合,有力地驗證了理論公式推導(dǎo)的正確性以及推導(dǎo)思想的合理性。最后,對兩種虛擬信道調(diào)度算法在AOS中自相似業(yè)務(wù)流下的第二級多路復(fù)用的性能表現(xiàn)進行仿真對比分析。選擇傳統(tǒng)動態(tài)優(yōu)先級調(diào)度算法和具有廣泛適用性的邊界可移動虛擬信道調(diào)度算法進行仿真分析,將兩種算法在各虛擬信道平均調(diào)度時延、各虛擬信道最大時延、系統(tǒng)平均調(diào)度時延、系統(tǒng)最大時延、信道利用率方面進行對比,仿真結(jié)果表明,在自相似業(yè)務(wù)流量下,具有廣泛適用性的邊界可移動虛擬信道調(diào)度算法較之傳統(tǒng)動態(tài)優(yōu)先級調(diào)度算法在調(diào)度時延性能及信道利用率方面仍然具有優(yōu)越性,并說明具有廣泛適用性的邊界可移動虛擬信道調(diào)度算法亦適合自相似業(yè)務(wù)流量模型的AOS虛擬信道調(diào)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.
【學(xué)位授予單位】：沈陽理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：V443.1;V556

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本文編號：1670154