【作者】 卢宇；

【导师】 曾华燊；

【作者基本信息】 西南交通大学 ， 计算机应用技术， 2006， 硕士

【摘要】 本论文所反映研究工作的背景是四川省网络通信重点实验室与核工业部九院的合作预研项目:“无人机群作战网络体系结构”(UASG-TNA-Unmanned Aircraft System Group Tactic Network Architecture)。由于作为无人驾驶飞机网络节点的无人驾驶飞机工作于敌对的空间,通信条件恶劣;无人机具有高速移动性,因此,有必要重新审视传统的自组网络的体系结构和相关技术。路径信息交换协议和路径选择算法是任何网络必须涉及的技术,因此,本项目的研究重点是以自组网络中使用最广的路径信息交换协议和路径选择算法为对象,针对UASG-TNA的需要进行适应性的改进。在本项研究中,笔者以自组网络中先应式路由协议的代表——OLSR(Optimized Link StateRouting)路由协议为对象,对该协议的性能进行了分析和仿真实验:根据实验结果进一步探讨了对该协议的改进方案。笔者具体的研究工作和贡献包括: ■ 通过对经典OLSR路由协议进行理论分析和仿真实验,为了改进网络负荷较重时,针对MAC帧的发送冲突和处理能力对OSLR路由协议数据传输性能质量制约,提出一种基于MAC(Medium Access Control)层反馈信息和TC(Topology Control)消息重发机制的改进方案。仿真实验表明该方案在网络负荷较重且各节点负荷不平衡的情况下,通过选择冲突较小的路径可提高数据传输的成功率和增强网络承受负荷的能力。 ■ 在分析西南交大博士研究生周迅提出的基于源选径的多路径SR-MPOLSR(Source Routing-Multipath OLSR)协议的基础上,实现了该协议并进一步提出一种改进方案。SR-MPOLSR协议可在一定程度上更好地利用网络资源,改善链路的吞吐量、平均延迟,增加健壮性和可靠性,但是多径传输也增加了同一链路在多条路径中被复用的可能性,从而加剧了该类链路的数据丢失率。笔者的改进在于利用基于MAC层反馈信息和TC重发机制形成的拓扑状况表作为选径依据。笔者的模拟实验表明改进后的SR-SR-MPOLSR可进一步提升SR-MPOLSR的性能。 ■ 笔者以“无人侦察机摄像获得的数据在UASG-TNA中传输过程作为考查更多还原

【Abstract】 The background of the work presented in this dissertation is the research project on Unmanned Aircraft System Group Tactic Network Architecture (UASG-TNA), undertaking at Sichuan Network Communication Technology Key Laboratory (SC-Netcom Lab). It is necessary to rethink and rectify architectures of Ad hoc networks and relevant techniques in view that UAS will work in a hostile environment and move much faster than traditional nodes in Ad hoc networks. Routing information exchange and routing algorithms are very important for any networks;therefore, the author’s work is dedicated to a popular routing protocol in Ad hoc network, i.e. OLSR (Optimized Link State Routing) protocol. The work presented in this dissertation include analysis of OLSR and improvement, author’s contribution can be summarized as:A. The first contribution is to improve the performance of OLSR by incorporating feedbacks of MAC layer functioning information and Topology Control (TC) message retransmitting mechanism into routing decision. Simulation results have shown that this strategy enables selection of a path with less collision consequently to increase successful reception rate when network is in a heavy loaded condition and with unbalanced node-traffic.B. Further improved the SR-MPOLSR (Source-Routing based Multi-Path OLSR) introduced by Xun Zhou, a PhD student at SWJTU by use of the topology table obtained through feedback of MAC layer information and TC retransmission. Simulation of the improved SR-MPOLSR has better performance.C. Finally, the author made an experiment on testing video streams transmission over an emulated UASG-TNA network with a useful result. This was done by adding a new module to the simulation tool - OPNET.更多还原