基于多传输手段的自组网路由协议研究

Research on routing protocol of Ad Hoc Network based on multiple transmission methods

为了实现多手段通信资源的全局共用与优化使用,针对通信节点多传输手段的自组网特点,提出了一种基于节点MPR的OLSR路由协议(N-OLSR)。首先对HELLO报文格式进行修改,加入Port字段,根据通信手段的不同,对Willingnes字段的值做出修改,用接口索引来代替接口IP地址,将链路带宽大的信道用大索引号表示。以此为基础,从全局出发制定路由策略,将通信节点作为MPR的选举对象,改变传统方法在每个接口上进行MPR选举的机制。最后,通过仿真实验来测试N-OLSR路由协议的性能。结果表明,改进的协议完成了MPR从接口到节点的转移,降低了源节点将一跳邻居节点选为MPR的频率,从而减少TC报文的产生以及洪泛;改进的路由协议能够减少控制开销,降低丢包率,加快网络收敛速度。研究结果可为多传输手段的移动自组网提供一种可靠的路由协议方案,并且信道带宽越小越能发挥其性能。

In order to realize the global sharing and optimal use of multi-means communication resources,an OLSR routing protocol based on node MPR(N-OLSR)was proposed according to the Ad Hoc Network characteristics of communication nodes with multi-transmission means.First,the format of the HELLO message was modified,the Port field was added,and the value of the Willingnes field was modified according to different communication methods.The interface IP address was replaced by the interface index,and the channel with a large link bandwidth was represented by the large index number.Based on this,the routing strategy was formulated from a global perspective,the communication node was regarded as the MPR election object,and the traditional method of MPR election mechanism on each interface was changed.Finally,the performance of the N-OLSR routing protocol is tested through simulation experiments.The results show that the improved protocol completes the transfer of MPR from interface to node,reduces the frequency of the source node selecting a one-hop neighbor node as the MPR,thereby reducing the generation and flooding of TC packets;the improved routing protocol can reduce the control overhead,decrease the packet loss rate and accelerate the network convergence speed.The research results provide a reliable routing protocol scheme for Mobile Ad Hoc Network with multiple transmission methods,and show that the smaller the channel bandwidth is,the better its performance is.