【作者】 林志伟；

【导师】 潘日晶； 许力；

【作者基本信息】 福建师范大学 ， 应用数学， 2005， 硕士

【摘要】 本文对目前无线通信网络最活跃的研究领域——无线AdHoc网络进行了研究。针对无线AdHoc网络中存在的相关问题,论文重点研究了无线AdHoc网络的体系结构,极小连通支配集算法和TCP性能,目的在于对无线Ad Hoc网络的性能进行优化。首先,论文通过引入移动代理和主动网络技术,首次提出了一个基于移动代理的无线Ad Hoc网络的开放式构架,旨在解决分层结构所带来的一系列问题;其次,针对基于移动代理的主动Ad Hoc网络开放式构架,应用图着色算法,提出了一个新的无线Ad Hoc网络的极小连通支配集算法,用于构建虚拟主干网,通过理论分析和仿真手段验证了算法的性能,仿真结果表明算法在节点密集的网络环境中具有良好的效果;最后,论文分析了当前无线AdHoc网络中TCP性能存在的问题和研究状况,提出了一个基于TCP层和路由层跨层协作的TCP性能增强策略RP-DSR,应用该策略改进了NS2仿真器中的DSR路由协议,仿真结果显示,RP-DSR比DSR路由协议的TCP性能有了较大的提高。更多还原

【Abstract】 This thesis is concerned with wireless ad hoc networks, which has become one of the most favorite area in wireless mobile communication. By analyzing the exiting problem of wireless ad hoc networks, this thesis mainly studies framework, minimal connected dominating sets(MCDS) algorithms and TCP performance, which aims at the performance optimization in wireless ad hoc networks. Firstly, to deal with a series of problems, which are caused by infrastructure layering in wireless node, a mobile agent based open framework for wireless ad hoc networks is proposed with the help of mobile agent and active networking technologies. Secondly, a new algorithm of minimal connected dominating sets in wireless ad hoc networks is proposed by using coloring algorithm in graph theory. The MCDS generates the virtual backbone for wireless ad hoc network. The performance of the MCDS is proved by theoretical analysis and simulation, which show that the MCDS algorithm works well especially in dense environment. Finally, the existing problem and current development of TCP performance in wireless ad hoc networks was introduced. Based on the cooperation of TCP and route layers, a new strategy to enhance TCP performance, called RP-DSR, is proposed and applied to dynamic source protocol(DSR) in NS2 simulator. The simulation result shows that the RP-DSR outperforms DSR.更多还原