【摘要】：在網(wǎng)絡(luò)演算概念提出之后,就吸引了大量的學(xué)者去研究,使它得以不斷發(fā)展和豐富,形成了兩個(gè)理論體系——確定性和隨機(jī)性網(wǎng)絡(luò)演算。以太網(wǎng)技術(shù)有很多優(yōu)點(diǎn),如成本低廉、使用穩(wěn)定和共享資源豐富等,以以太網(wǎng)技術(shù)為代表的通信技術(shù),發(fā)展迅速,很快壟斷了辦公領(lǐng)域的使用網(wǎng)絡(luò),而且慢慢應(yīng)用到工業(yè)控制和航空航天等領(lǐng)域。但對(duì)以太網(wǎng)技術(shù)的需求不斷更新,不僅需要其高速率,還需要有實(shí)時(shí)性和確定性,由此,確定性以太網(wǎng)應(yīng)運(yùn)而生。確定性以太網(wǎng)還處于研究階段,網(wǎng)絡(luò)演算理論為其性能研究和分析提供了很好的理論依據(jù)。網(wǎng)絡(luò)演算理論和確定性以太網(wǎng)技術(shù)各自都有很大的發(fā)展,但采用網(wǎng)絡(luò)演算進(jìn)行確定性以太網(wǎng)研究分析的工作很少。本論文的工作就是采用網(wǎng)絡(luò)演算理論工具對(duì)確定性以太網(wǎng)進(jìn)行性能研究與分析。首先,建立仿真通信模型,建立基本模型:數(shù)據(jù)模型(時(shí)間觸發(fā)、速率受限和盡力而為數(shù)據(jù)模型)、進(jìn)程模型、節(jié)點(diǎn)模型,由簡(jiǎn)單到復(fù)雜構(gòu)建網(wǎng)絡(luò)拓?fù)浣Y(jié)構(gòu),提出了簡(jiǎn)單星型、級(jí)聯(lián)和雙通道拓?fù)浣Y(jié)構(gòu),級(jí)聯(lián)結(jié)構(gòu)是星型結(jié)構(gòu)的延伸,雙通道是為了解決確定性以太網(wǎng)的容錯(cuò)問(wèn)題。其次,建立三種網(wǎng)絡(luò)拓?fù)浣Y(jié)構(gòu)的網(wǎng)絡(luò)演算數(shù)學(xué)模型,基于簡(jiǎn)單星型拓?fù)浣Y(jié)構(gòu),復(fù)雜拓?fù)浣Y(jié)構(gòu)在考慮了多種因素(如不同流向的數(shù)據(jù))的同時(shí),還使用了反卷積理論建立數(shù)學(xué)模型,得到三種拓?fù)浣Y(jié)構(gòu)下的網(wǎng)絡(luò)性能參數(shù)的理論結(jié)果。最后,從端到端時(shí)延、吞吐量和丟包率三個(gè)方面將仿真結(jié)果和理論結(jié)果進(jìn)行對(duì)比研究和分析,得出確定性以太網(wǎng)的性能結(jié)論。本論文經(jīng)過(guò)研究和分析,由簡(jiǎn)單到復(fù)雜的三種拓?fù)浣Y(jié)構(gòu)中,時(shí)間觸發(fā)數(shù)據(jù)是保證實(shí)時(shí)服務(wù)的,無(wú)丟包;速率受限數(shù)據(jù)的優(yōu)先級(jí)較時(shí)間觸發(fā)數(shù)據(jù)次之,其時(shí)延值在理論計(jì)算范圍之內(nèi),除非數(shù)據(jù)量很大時(shí),有少量丟包,一般無(wú)丟包;盡力而為數(shù)據(jù)是確定性以太網(wǎng)兼容的傳統(tǒng)以太網(wǎng)的數(shù)據(jù),不能保證其服務(wù),允許其在排隊(duì)等待處理時(shí)的時(shí)延超出理論值,之后又恢復(fù)正常。雙通道拓?fù)浣Y(jié)構(gòu)在保證確定性和實(shí)時(shí)性的基礎(chǔ)上,很好的發(fā)揮了容錯(cuò)功能�？偟膩�(lái)說(shuō),確定性以太網(wǎng)擁有良好的性能,可促使其應(yīng)用到航空航天或者工業(yè)控制等領(lǐng)域進(jìn)行推廣。
[Abstract]:After the concept of network calculus was put forward, it attracted a large number of scholars to study it, which allowed it to develop and enrich constantly, and formed two theoretical systems-deterministic network calculus and stochastic network calculus. Ethernet technology has many advantages, such as low cost, stable use and rich shared resources, etc. The communication technology represented by Ethernet technology has developed rapidly and soon monopolized the use of network in the office field. And slowly applied to industrial control and aerospace and other fields. However, the demand for Ethernet technology is constantly updated, which not only requires its high speed, but also needs real-time and certainty. Therefore, deterministic Ethernet emerges as the times require. Deterministic Ethernet is still in the research stage, network calculus theory provides a good theoretical basis for its performance research and analysis. The theory of network calculus and deterministic Ethernet technology have developed greatly, but the research and analysis of deterministic Ethernet based on network calculus is rare. The work of this thesis is to study and analyze the performance of deterministic Ethernet with network calculus theory. First of all, the simulation communication model is established, and the basic model is established: data model (time trigger, rate limited and best effort data model), process model, node model, from simple to complex to construct the network topology structure. Cascade and double channel topology, cascade structure is the extension of star structure, dual channel is to solve the fault tolerance problem of deterministic Ethernet. Secondly, the mathematical models of three network topologies are established. Based on the simple star topology, the complex topology takes into account a variety of factors (such as different flow data) at the same time. The mathematical model is established by using deconvolution theory, and the theoretical results of network performance parameters under three topologies are obtained. Finally, the simulation results and theoretical results are compared and analyzed from three aspects of end-to-end delay, throughput and packet loss rate, and the performance conclusions of deterministic Ethernet are obtained. Through the research and analysis of this thesis, among the three topologies from simple to complex, the time trigger data is guaranteed to serve in real time and has no packet loss, and the priority of rate limited data is second to that of time trigger data. The delay value is within the range of theoretical calculation, unless there is a small amount of packet loss when the amount of data is very large, generally there is no packet loss, but the best effort data is the data of the traditional Ethernet, which is compatible with deterministic Ethernet, and cannot guarantee its service. It allows the delay to exceed the theoretical value while queuing for processing, and then returns to normal. Dual-channel topology works well on the basis of certainty and real-time. In general, deterministic Ethernet has good performance and can be applied to aerospace or industrial control.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TP393.11

【參考文獻(xiàn)】

相關(guān)期刊論文 前1條

1 胡曉婭;朱德森;汪秉文;;基于網(wǎng)絡(luò)演算的交換式以太網(wǎng)實(shí)時(shí)特性分析[J];計(jì)算機(jī)工程與應(yīng)用;2008年01期

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本文編號(hào)：2292033