带有节点编码能力感知的 DTN 数据转发机制

摘要

The efficiency of data transmission can be improved effectively by the network coding method in delay tolerant network (DTN),but it is necessary to choose coding nodes reasonably.A coding capability aware data forwarding mechanism for DTN is proposed.Based on historical information of node movement,the tempo-ral graph is established to model the connection between the nodes.Considering average encounter time inter-val,shortest length of path,and reachability,the utility value of the node forwarding can be obtained.Further-more,the coding node can be selected reasonably.Results show that the utilization of network resources can be enhanced,and the network performance can be improved effectively.%网络编码方法能够有效地改善延迟容忍网络的数据传输效率，其关键问题在于合理地选择编码节点。提出了一种带有节点编码能力感知的延迟容忍网络数据转发机制。根据网络中节点运行的历史相遇信息，建立时间图模型以感知节点之间的连接态势，并根据平均相遇时间间隔、最短路径长度及可达率等3方面因素综合确定节点转发能力，进而以动态的方式选择编码节点。结果表明，所提出的策略能够有效地提高网络资源利用率，改善网络的性能。