DTN中基于二分散发和等待路由的自适应拥塞控制策略

Adaptive congestion control strategy based on binary spray and wait routing in DTN

针对二分散发和等待路由中报文被转发的特点,提出节点首先通过应答交换机制丢弃已被递交到信宿节点的报文,来减少网络中冗余报文的传输;当节点缓存完全占用又需存储新报文时,执行拥塞检测和拥塞避免操作,遍历缓存,找到缓存中拷贝数最小的报文将其丢弃(若此报文正在被传输则丢弃拷贝数次小的报文)直至有足够的缓存空间存储新接收到的报文。通过大量仿真实验及相关数据的分析与比较,说明该拥塞策略能显著提高递交率,减小开销,并对拥塞状况有更好的自适应能力。

Considering the characteristic of message forwarded in the spray and wait routing,this paper presented that a node will drop the delivered messages depending on ACK exchange mechanism to reduce the transmission of redundancy messages in the network.When the buffer of a node was fully occupied and it needs to store new messages,the node would start congestion detection and congestion avoidance.It would lookup per message in its buffer,and drop the message whose number of copies was least （if this message was being sent,the message of second least copies was returned） until the buffer has enough space to store new received messages.By the analysis and comparison of the related data in a large amount of simulation experiments,it demonstrates that this congestion control strategy can significantly enhance delivery utility and reduce the overhead,and be better adaptive to the congestion.