DTN分发网络中基于数据投递概率的拥塞控制机制

Congestion control mechanism based on data delivery probability in DTN data dissemination network

针对DTN网络数据编码分发过程中数据拥塞造成投递性能下降的问题,提出了一种基于主题数据投递概率的节点拥塞控制机制(CCM-DP)。综合考虑节点移动模型、主题包投递概率、节点拥塞程度等因素建立数据投递概率模型,从两方面进行拥塞控制,一方面基于数据投递概率动态调节数据分组转发过程,避免节点因收取过多的数据分组造成拥塞,另一方面,通过设计合理的丢弃策略,降低因拥塞造成数据分组丢失产生的影响。最后,将该拥塞控制机制应用在数据分发过程中进行了仿真分析,结果表明,该方法能提升数据拥塞情况下的数据投递性能。

A congestion control mechanism based on data delivery probability(CCM-DP) was proposed to work out the decline of data delivery performance on account of data congestion in delay tolerant networks(DTN) network coding-based data dissemination process. Considering the node mobility model, data delivery probability and data congestion degree, the data delivery probability model was constructed, and the congestion control mechanism was designed from two aspects, on the one hand, by the means of adjusting the packet forwarding process, it equilibriums the data packet delivery to avoid node congestion caused by too many packets received; and on the other hand, through the design of efficient discarding strategy, it reduces the impact of packet loss caused by data congestion. Ultimately, it was put into use in data dissemination process and some simulations were taken, the simulation results show that, CCM-DP can improve data delivery performance in data congestion environment.