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DTN(Disruption and Delay Tolerant Network)网络链路频繁中断[1]的特性决定了其与其他网络相比有更大的延迟,因此如何建立DTN网络的延时模型,并对其进行优化设计显得尤为重要。文章采用了“带有完全故障的排队系统”对产生DTN网络延时的因素进行建模分析,得到了数据包在整个传输过程中的平均延时。最后充分利用了Raptor码线性的编译码复杂度、译码成功率高以及无速率的优点,对数据包在信源处进行Raptor编码后再传输,仿真表明:相比于不采用编码或采用LT编码,Raptor码的应用大大的缩短了DTN网络时延,从而使得整个系统的性能得以优化。
DTN (Disruption and Delay Tolerant Network) network link frequently interrupt [1] features determine its delay compared with other networks, so how to build DTN network delay model, and its optimal design is particularly important. In this paper, we use the “queuing system with complete failure” to model and analyze the factors that cause the delay of DTN network. The average delay of the data packets in the whole transmission process is obtained. In the end, Raptor codes are linearized with the complexity of coding and decoding, the high success rate of decoding and the advantage of no rate. The Raptor codes the data packets at the source and then transmits them. The simulation shows that compared with the coding without LT Encoding, Raptor code greatly reduces the DTN network delay, so that the performance of the entire system can be optimized.