摘要
节点移动是导致移动自组织网络性能下降、限制网络规模扩展的关键因素之一.寻找稳定路径是减小节点移动影响的有效手段.现有的稳定路径寻找方法存在以下局限:需要节点具有地理位置定位的硬件功能支持,或需要信号强度上传的交叉层功能支持.为此,提出了不需要特殊硬件支持、可独立于底层协议工作、基于邻居变化率的稳定路径选择方法.以AODV(Ad hoc on-demand distance vector)按需路由协议为基础,扩展为NCR-AODV(Neighbor change ratio Ad hoc on-demand distance vector)路由协议.新协议选择转发跳数少并且局部拓扑变化小的路径进行数据转发.仿真结果表明,NCR-AODV协议减小了长路径中断概率,提高了网络性能.
Node mobility is one of the dominant factors causing decreased performance in mobile ad hoc networks and restricting network scalability. Selecting stable paths is an effective way to reduce the impact of node mobility. Current methods of selecting stable paths in mobile ad hoc networks suffer from several shortcomings. They may need a hardware function support for geographical position location or cross-layer function support for sending signal strength information to upper layers. In this paper, a new method of selecting stable paths based on the neighbor change ratio is proposed. Neither the special hardware support nor the cross-layer support iS needed in this new method. NCR-AODV （neighbor change ratio Ad hoc on-demand distance vector） routing protocol is an extension of the AODV （Ad hoc on-demand distance vector） on-demand route protocol with the new method. The new protocol selects the path which has smaller hop counts and less local topology changes to forward data. The simulation results show that NCR-AODV protocol decreases the long path break probability and improves the network performance.
出处
《软件学报》
EI
CSCD
北大核心
2007年第3期681-692,共12页
Journal of Software
基金
Supported by the National Natural Science Foundation of China under Grant No.60403031(国家自然科学基金)
the National HighTech Research and Development Plan of China under Grant No.2005AA121560(国家高技术研究发展计划(863))
the Fundamental Research Project of the Institute of Computing Technology
the Chinese Academy of Sciences (中国科学院计算技术研究所基础研究项目)
the Youth Innovation Foundation of the Institute of Computing Technology
the Chinese Academy of Sciences(中国科学院计算技术研究所青年创新基金)
