摘要
通过对AODV路由算法中两种局部连接性管理方法的测试,发现这两种方法都会出现链路判断出错的情况.通过分析出错产生的原因,本文对HELLO机制进行了改进,提出了一种非持续性周期发送HELLO的中断检测方法.当节点处于活动状态就取消周期性HELLO广播,通过接收的数据分组,及MAC层定期上报伪造的HELLO消息来更新局部信息.最后通过在NS-2网络模拟器环境中的实验,表明当网络拓扑变化不大,活动节点数目较多的情况下,该方法能有效提高链路中断检测的准确性,降低控制分组产生的网络开销,提高网络的传输效率.
in this paper , the authors test two local connectivity management methods in AODV routing protocol and find that both of them do wrong link failure detections in some cases. By analyzing the reason of wrong detections, this paper presents an Interrupt Periodically Sending HELLO Messages method of detecting link failure based on AODV of using HELLO messages. When the node is in the status of sending or forwarding data packets, it stops periodically sending HELLO messages. It uses receiving data packets and spurious HELLO messages from MAC layer to update local information. Finally the authors use ns2 network simulator to test this new method, and the result suggests that this method can improve veracity of link failure detection, cut overhead of control packets, and increase efficiency of network transmission, when the topology changes little and most of the nodes are doing transmission.
出处
《四川大学学报（自然科学版）》
CAS
CSCD
北大核心
2006年第6期1242-1247,共6页
Journal of Sichuan University(Natural Science Edition)
