【作者】 陈宇；

【导师】 廖青；

【作者基本信息】 北京邮电大学 ， 电子与通信工程（专业学位）， 2022， 硕士

【摘要】 无线自组织网络(Ad Hoc)是一种无中心、不依赖基础设施的分布式网络,以其即时部署、灵活易扩展的特点广受专家学者青睐。随着Ad Hoc技术的快速发展,其应用场景逐渐增多。为适应愈加复杂的场景,越来越多自组织网络相关协议被提出。对于自组织网络协议验证,传统的做法是采用仿真模拟的方式。但鉴于仿真模拟的封闭性,经常无法发现协议中客观存在的一些问题。为提高仿真验证的可靠性,本课题考虑将仿真网络中的虚拟节点与现实世界中的实际节点相结合,实现虚实联合的网络仿真系统,从而打破传统自组织网络仿真实验固有的封闭性。本文相关研究围绕虚实联合网络仿真系统中的实际节点展开,主要贡献包含以下三点:一、深入分析实际节点接入仿真网络存在的问题,结合无线自组织网络的特点,设计了节点映射入网方案。通过映射入网方案实现了外部节点接入仿真网络,解决了实际节点与仿真内部的虚拟节点间的信息交互问题。二、在嵌入式Linux环境下,遵循自组织网络各层协议,分模块设计开发实际节点系统。不同模块间相互协作,共同实现节点感知、自主组网、路由控制、数据传输等功能。同时开发了多种控制指令接口,为人为干预节点行为以及业务场景编辑提供手段。最后通过映射入网方案,将实际节点接入到仿真网络,以虚实联合仿真的形式进行了实际节点系统功能验证。三、本文针对现有自组织网络存在的簇结构不稳定、网络质量差的问题,提出了一种基于轨迹预测的簇首更新策略(Cluster Head Election Strategy Based On Trajectory Prediction,CHEBTP)。该策略通过及时调整簇首节点,延长簇内节点与簇首节点的通信时间,从而减少离簇节点数量,实现对簇结构的优化。将该策略在搭建的虚实结合自组织网络环境中进行验证,结果表明,与传统的簇首选举算法相比,该策略有效地提高了自组织网络稳定性。更多还原

【Abstract】 Wireless Ad Hoc network is a distributed network without center and basic facilities.It is widely favored by experts and scholars because of its real-time deployment,flexibility and easy expansion.With the rapid development of Ad Hoc technology,its application scenarios are gradually increasing.In order to accommodate more and more complex application scenarios,more and more Ad Hoc network protocols have been proposed.For the verification of Ad Hoc network protocol,the traditional method is to use simulation.However,in view of the limitations of simulation,it is often difficult to find some problems.In order to improve the reliability of simulation verification,the paper considers the combination of virtual nodes in the simulation network and actual nodes in the real world and then realizes the virtual-real network simulation system.This paper focuses on the actual nodes in the system,and the main contributions include the following three aspects.First,this paper deeply analyzes the problems of external nodes accessing the simulation network,and designs the node-mapping scheme combined with the characteristics of Ad Hoc.The scheme solves the problem of information interaction between the actual nodes and the virtual nodes,without making a lot of changes to the original simulation network.Second,this paper follows the Ad Hoc network protocol in the original simulation,and designs and develops the actual node by module in the embedded Linux environment.Each module cooperates with each other to jointly realize the functions of node perception,autonomous networking,routing control,data transmission and so on.At the same time,this paper also develops a variety of control instruction interfaces to provide means for human intervention in node behavior and business scenario editing.Finally,through the mapping scheme,the actual node is connected to the simulation network.And the function verification of the actual node is completed in the form of virtual real joint simulation.Third,this paper proposes a cluster head update strategy based on trajectory prediction(CHEBTP),which aims at the problems of unstable cluster structure and poor network quality in existing ad hoc networks.By adjusting the cluster head node in time,the strategy can prolong the communication time between the nodes in the cluster and the cluster head node.The strategy is verified in the built simulation environment.And the results show the strategy effectively improves the stability of Ad Hoc network,compared with the traditional cluster head election algorithm.更多还原