Ad hoc网络AODV及OLSR路由协议研究

【作者】 祝思路；

【导师】 郭伟；

【作者基本信息】 电子科技大学 ， 通信与信息系统， 2008， 硕士

【摘要】 无线移动自组织网是以Ad hoc技术为基础的互联的无线电台、计算机硬件和软件的集合,主要用于满足应急通信和军用移动通信需求。因此,满足无线移动自组织网要求的路由协议的目标是快速、准确、高效、可扩展性好。基于无线移动自组织网的网络环境,在源发起按需路由协议中选用AODV路由协议作为网络层协议,分析研究AODV协议本地修复算法的特点,并对其进行改进,形成了改进的AODV路由协议本地修复算法;同时,针对AODV路由协议的泛洪寻路过程,提出了一种基于跨层设计思想的泛洪优化策略,对AODV协议RREQ报文的泛洪进行控制。在表驱动路由协议中选用OLSR路由协议作为路由协议,建立了分级的Ad hoc网络,完成了整个协议在OPNET仿真系统中的设计、代码编写、调试的工作。并且完成了OLSR路由协议在分级网络中的分级通信设计、与IPv6模块的协作等工作。本文采用OPNET系统仿真工具搭建了无线移动自组织网的仿真平台,通过仿真比较不同网络环境下的AODV路由协议本地修复算法的网络性能和改进后的AODV路由协议本地修复算法的网络性能,验证了改进算法的可行性;通过仿真比较原始AODV路由协议的寻路过程的性能和基于跨层设计思想的泛洪优化之后的寻路过程的性能,验证了改进算法的有效性;通过仿真验证了所编写的OLSR路由协议仿真模块在分级网络中的正确运行。更多还原

【Abstract】 Wireless Mobile Ad hoc Network (MANET) is the aggregation of hardware and software that include wireless transmitter-receivers and computers, which is based on the wireless packets network. Because MANET is mainly used for emergency and military wireless communication, the aims of the MANET routing protocol are rapid, exact, effectual and expandable.Based on Ad hoc environment, AODV routing protocol is chosen from source-initiated-on-demand-routing protocols as the network layer protocol. A new idea about local repair is used to improve the AODV and formed the Improved AODV algorithm. Otherwise, a new approach is proposed for flooding limit. The approach is implemented by using cross-layer design, which limits the flooding procedure of RREQ packets in AODV routing protocol.Olsr routing protocol is chosen from table-driven protocols as the network layer protocol in a hierachical network built on OPNET system. Designing、programming、debuging of the OLSR protocol simulating module and its cooperating with IPv6 module have been done.A simulating platform of MANET is built on OPNET simulator. And the simulations done on this platform have proved the validity of Improved AODV local repair algorithm and the Improved AODV flooding algorithm, and the well performance of OLSR simulating module on the hierachical network.更多还原