一种集成网络编码的低轨卫星网络多径路由方法

针对星际链路的时变性、不可靠性和间断性连接的特点使得在低轨卫星网络中应用多径路由技术产生报文乱序和报文丢失现象,提出一种集成网络编码的多径路由方法。理论分析表明,在同等多路径数目和报文丢失率条件下达到相等的报文投递率,该方法的传输性能优于传统的多径路由方法。通过扩展ns-2软件并进行仿真实验,比较2种方法在不同的多路径数目、冗余因子和链路报文丢失率条件下的报文投递性能,仿真结果验证了理论分析的正确性,表明采用该方法可显著提高多径路由传输的可靠性,节省星上通信资源并在一定报文丢失范围内提升多径路由的容错能力。

A multi-path routing scheme integrated with network coding in low earth orbit satellite networks

Inter-satellite links have characters of time-varying,unreliability and intermittent-connecting,so that applying the multi-path routing in the low earth orbit(LEO) satellite networks can make message disorder and message loss.A multi-path routing scheme integrated with network coding was proposed to solve this problem.It is proved that with the same multi-path number and path message loss rate,the scheme outperforms the traditional multi-path routing in terms of message delivery rate.Moreover,the performances of both schemes were evaluated by the extended ns-2 software in terms of message delivery rate under the conditions of different multi-path numbers,link message loss rates and redundancy factors.The result validates the theory analysis and shows that the scheme can efficiently improve the reliability and save the onboard communication resources as well as enhance the error control of multi-path routing with certain ranges of message loss.