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1、硕 士 学 位 论 文基于模型驱动的网络仿真场景建模方法设计研究 专业名称：信息与通信工程 基于模型驱动的网络仿真场景建模方法设计研究摘要随着信息技术的发展，现代通信网络日益复杂，网络设计已成为极具挑战性的课题。网络仿真则是网络设计和仿真验证的重要手段，OPNET、NS2、QualNet等网络仿真器有力的推动了网络新技术的发展。目前主流的网络仿真器普遍存在着仿真场景建模过程效率不高、建模方式不够灵活、建模结果难以复用等问题。通常需要逐一建立节点链路等网络元素，设置大量的网络参数，并且仿真器的建模规范各不相同。这些都给设计人员带来了额外的负担，限制了仿真建模的效率。在大规模网络仿真、批量仿真、共
2、享仿真器等情况下问题更加突出。软件工程为解决业务需求多变和实现技术多样的矛盾提出了模型驱动框架，这为其他领域的建模带来了启发。其核心思想是以模型为中心对复杂系统建模，运用模型转换工具适配到具体的实现平台，从而提高模型抽象层次和建模结果适用性。网络仿真领域同样面临仿真场景多变、仿真器建模规范各异的问题，因此引入模型驱动的思想解决网络仿真建模问题是有意义的。本文则是针对网络仿真面临的共性问题，提出了基于模型驱动的网络仿真场景建模方法，并实现了建模工具。本文的主要工作及贡献如下：1、分析总结了网络仿真建模的内容、网络仿真器面临的问题和已有的解决方法、模型驱动框架的研究现状和在其他领域的研究成果。2、
3、设计了基于模型驱动的网络仿真场景建模方法，方法框架分为模型层、描述层和适配层，针对每一层进行了仔细的分析和设计。模型层提供建模元素和建模语法，描述层基于模型层对网络仿真场景进行建模，适配层则负责转换模型得到特定仿真器的建模结果。3、针对建模方法实现了建模工具，总体框架分为基础设施层、数据层和业务层。其中基础设施层提供GUI应用程序的基础功能，包括多文档窗口管理、画布绘图操作、程序资源管理等。数据层则提供数据驱动服务，包括模型分类存储、模型属性表达与操作等功能。业务层则面向用户，提供多种建模工具的操作界面和功能实现。4、最后通过应用实例和仿真系统分析总结了本文建模方法的有效性和建模工具的实用性，
4、为构建其他仿真系统提供了借鉴。关键词：网络仿真，模型驱动框架，仿真场景建模方法，仿真建模工具VAbstractWith the development of information technology, modern communication network has become increasingly complex, making network design a challenging task. Network simulation is an important means for network design and simulation verification. Many
5、 excellent network simulators such as OPNET, NS2, and QualNet have effectively promoted the rapid development of new network technologies. However, current mainstream network simulators have problems such as inefficient modeling process, inflexible modeling method, and difficulty in reusing modeling
6、 result. It is usually necessary to establish network elements such as nodes and links one by one, and manually set a large number of network parameters, and different simulator have different modeling specifications. All this imposes an additional burden on network designers and limits the efficien
7、cy of simulation modeling. The problem is even more pronounced in large-scale network simulations, batch simulations, and simulations with shared simulators.Software Engineering proposes Model Driven Architecture(MDA) for resolving the contradictions between changing business requirements and multip
8、le implementing technologies, which has inspired the modeling in other fields. By using model and model conversion, MDA improvs the level of model abstraction and generality of modeling results. Network simulation modeling also faces the contradictions between varying simulation scenarios and differ
9、ent simulator modeling specifications. Therefore, it is meaningful to introduce a model-driven idea to solve network simulation modeling problems. This paper aims at the common problems that affect network simulation modeling, proposes a model-driven network simulation scenario modeling method, and
10、realizes an efficient modeling tool. The main research work and contributions of this article are as follows:1. Network simulation modeling problem and the existing solutions are detailed. Besides, the research of MDA is reviewed.2. A method of Network simulation scenario modeling based on Model Dri
11、ven Architecture is proposed. It is divided into 3 layers called Model Layer, Description Layer and Adaptation Layer. Model Layer provides modeling elements and modeling grammar. Description Layer models the network simulation problem based on Model Layer. Adaptation Layer is responsible for convert
12、ing the modeling result to a specific simulator. 3. A modeling tool is designed and implemented for the modeling method. Its overall framework is divided into 3 layers called Infrastructure Layer, Data Layer and Business Layer. Infrastructure Layer provides basic functions of GUI applications, inclu
13、ding multi-document window management, canvas drawing operation, and resource management etc. Data Layer provides data-driven services, including model storage, model expression and attribute operation etc. Business Layer is user-oriented and provides some useful modeling tools. 4. Application examp
14、les are used to analyze effectiveness of the modeling method and practicability of the modeling tool, which provides a reference for other simulation systems.Keywords: Network simulation, Model Driven Architecture, Simulation scenario modeling method, Simulation modeling tool目 录摘要IAbstractII目 录IV1 绪
15、论11.1 研究背景与意义11.2 国内外研究现状31.2.1 网络仿真技术31.2.2 网络仿真高效建模31.2.3 模型驱动建模方法41.3 本文研究内容与结构安排62 网络仿真建模问题分析72.1 相关概念72.1.1 模型与建模72.1.2 网络仿真与仿真器82.2 网络仿真器分析92.2.1 建模规范分析92.2.2 建模方法总结122.3 模型驱动框架分析132.3.1 基本概念132.3.2 应用分析152.4 本章小结163 基于模型驱动的仿真场景建模方法173.1 方法总体框架173.2 模型层设计183.2.1 元模型183.2.2 平台相关模型203.2.3 平台无关模型213.3 描述层设计233.4 适配层设计263.5 本章小结284 网络仿真建模工具实现294.1 需求分析294.2 总体框架设计314.3 基础设施层的设计实现314.3.1 开发平台与技术选型314.3.2 主界面与基础功能324.4 数据层的设计与实现344.4.1 文件目录服务344.4.2 模型表达与操作364.4.3 模型属性表达与操作394.5 业务层的设计与实现424.5.1 模型编辑器424.5.2 网络编辑器
