DTN中基于两跳ACK确认机制的备用副本转发算法

针对容迟容断网络(Delay/Disruption Tolerant Networks,DTN)在遇到路由空洞问题时缺乏有效回避路由空洞区域的方法,导致信息端到端传输时延较大的问题,提出一种基于两跳ACK确认机制的备用副本转发算法。消息在空洞区域无法传播时由上一跳节点寻找其他符合条件的节点,另辟路径转发消息,从而避开路由空洞区域。仿真实验结果表明,该算法在递交率、平均时延和网络开销方面表现优于Spray and Wait等对比算法,在车载自组网中具有很强的应用性。

Two-hop ACK Message Based Routing Algorithm with Alternative Copy in DTN

Aiming at the problem of lacking effective method to dodge routing holes,which makes higher delay in end to end transmission,a forwarding algorithm based on two-hop ACK mechanism with alternative copies(2HAR) was proposed.To evade routing hole area and find a new communication path effectively,when sending a message,a backup that copies of the message will be maintained by a hop node.After receiving a confirmation of ACK,copies of the message will be deleted,or find other forwarding node to send a copy of the message.Results of the simulation indicate the proposed algorithm performs better in terms to the delivery ratio,the average end-to-end delays and the network overheads,which is significative to use in the VANET.