东海科学技术学院
毕 业 论 文（设计）
题 目： EPON动态带宽分配算法的研究 系 ： 学生姓名： 专 业： 班 级： C 指导教师： 起止日期： 3
日
东海科学技术学院本科生毕业论文
毕EPON动态带宽分配算法的研究
任湛
东海科学技术学院 机电系 浙江舟山 316004
摘要
随着互联网的盛行，接入网速度影响着全世界的信息传递速度。因此，在光网络技术得到了巨大发展的前提下，如何有效地分配带宽是提高接入网技术的关键问题之一。首先，在本文的绪论部分简述了接入网技术的发展状况，提出了接入网在高速信息网络上的“最后一公里”瓶颈问题。此外，还介绍了接入网及光接入网的一些知识，如结构、功能、特点等等，叙述了目前带宽分配技术的发展现状。其次，本文还具体介绍了无源光网络（PON）的结构及功能，以及PON技术的优越性。引出了结合了以太网技术和PON技术优点的基于以太网的无源光网络（EPON）技术。接着，EPON技术作为下一代宽带接入技术的最佳解候选者，本文将对EPON技术展开初步研究。除了详细阐述EPON系统的的基本结构、帧结构、功能、基本工作原理及优越性外，还谈及了EPON的一些关键技术。其中，对多点MAC控制和多点控制（MPCP）协议两方面内容进行具体介绍。然后，本文把EPON带宽分配的研究单独作为一个章节，进行重点阐述。介绍了EPON的两种带宽分配方式，分别是静态带宽分配和动态带宽分配。由于EPON在上下行传输方式的不同，因此针对不同用户的不同业务提供不同的服务质量，而进行动态带宽分配算法的研究和探讨是有必要的。提出了EPON系统现有的一些DBA算法，比较各类动态带宽分配算法的优缺点。在此基础上，对采用动态时隙分配的EPON算法进行设计，阐述了轮询机制和最大传输窗口两方面的内容。最后,介绍了OPTNET8.0光学仿真仿软件，并OPNET Molder中选择所需的模型，在编辑窗口建立了星型和树形两种拓扑结构模型、进程模型、网络模型等。通过模型建立，加深对EPON动态带宽分配方案的理解。还对EPON动态带宽分配算法的研究设计进行总结，并提出对未来EPON技术发展的看法。
【关键词】以太无源光网络，动态带宽分配，仿真，建模
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东海科学技术学院本科生毕业论文
ABSTRACT
With the fast development of Internet, the speed of network transmission has a large effect on the world .Therefore, under the optical network technology development, effectively improve bandwidth allocation is one of the key problems. Firstly, in the introduction part of this paper, it outlines the development of the access network technology, and proposes the problem that the access network exists the \mile\bottleneck in the high-speed information network. In addition, it also introduces the structure, functions, features of the access network and the optical access networks (OAN), and has a description of the current status of bandwidth allocation technology. Secondly, the paper presents the structure and the function of the passive optical network (PON) as well as the advantages of the PON technology. Then leads to the Ethernet passive optical network(EPON) technology that combines the advantages of Ethernet technology and PON technology.
Thirdly, EPON technology as the next-generation broadband access technology, it will be the best solution for the candidates. The paper will have a launched study on the EPON technology. EPON system will be described follow details: the basic structure, frame structure, function, basic working principle and technical nature, and the advantages of EPON technology. The paper also has the longer talk about some key technologies of EPON technology, and there are two aspects in detail: one is multi-point MAC control , the other is multi-point control (MPCP) protocol.
Then, the paper puts the EPON bandwidth allocation technique as a single chapter, that focuses on the theme, and introduces two methods of bandwidth allocation , one is static bandwidth allocation, the other is dynamic bandwidth allocation. For EPON, it is necessary for different users and different business offers different quality of service. Studying and discussing the dynamic bandwidth allocation algorithms are also important. Made some EPON system existing DBA algorithm, comparison of various dynamic bandwidth allocation algorithm of advantages and disadvantages. On this basis, to adopt a dynamic time slot allocation EPON algorithm design, illustrates the polling mechanism and maximum transfer window.
Finally, the introduction of the OPTNET8.0 optical simulation software simulation and OPNET Molder select the desired model, set up in the edit window, two star and tree topology model, process model, network model. Through modeling, EPON deepen the understanding of dynamic bandwidth allocation program. Also EPON Dynamic Bandwidth Allocation Algorithm design summarized, and future views of EPON technology.
Keywords: EPON, DBA(dynamic bandwidth allocation),Simulation, Modeling
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