空间DTN网络下的转发决策方法

Forwarding Decision Method on Space DTN Network

空间DTN网络采用存储转发机制进行数据传输,基于LTP红段来提供可靠传输以及LTP绿段或UDP等提供不可靠传输。如何灵活地利用可靠方式和不可靠方式进行数据传输,成为研究热点。提出一种基于历史重传率的转发决策方法,在链路质量较好时,采用不可靠方式进行数据传输,可以提高效率;当链路质量变差时,可以考虑采用可靠传输来提高传输成功率,并搭建了典型场景进行了试验,试验结果表明,在近地空间通信场景中,即信道误码率10^(-7)～10^(-6)之间时,该方法相较传统IPN方法,传输延迟时间更短,转发效率更高。

Space DTN network transfers data based on store-and-forward mechanism,using Red Segment of LTP protocol for reliable transform and using Green Segment of LTP protocol or UDP protocol for unreliable transform.It becomes a hot research that how to take advantage of reliable and unreliable method to transfer data flexibly.It proposed a forwarding decision method based on historical retransmission rate,using unreliable method to improve efficiency when link quality changes better and using reliable method to improve the successfully delivery rate when link quality changes worse.We have established typical experimental environment.And experiment results indicate that in near earth space scenario,i.e.BER between 10 -6 ~10 -7.Compared with traditional IPN forward method,our method has shorter transmit delay time and higher forward efficiency.