延迟/中断容忍网络技术及其在行星际因特网中的应用

延迟/中断容忍网络(DTN)采用一种新的端到端的覆盖层网络体系结构,是实现行星际因特网(IPN)的一种重要技术途径。文章首先论述了DTN应用于航天的几种网络协议的特点,包括束协议、利克里德传输协议(LTP)、空间数据系统咨询委员会文件传输协议(CFDP)和Saratoga协议,并分析了DTN路由算法的特点和DTN网络软件的实现,然后总结了NASA在遥感、空间站、中继通信和深空探测等任务情景下进行的DTN飞行验证试验的技术特点。针对我国未来天基综合信息网建设的需求,提出了DTN技术在体系结构、汇聚层协议、路由算法和网关节点设计方面值得关注的问题。

Delay/Disruption Tolerant Network and Its Application to Interplanetary Internet

DTN （delay/disruption tolerant network） is an important technological approach to the implementation of IPN （Interplanetary Internet） which introduces a novel end to end overlay net- work architecture. In this paper, the characteristics of space mission related DTN network proto- cols, including BP （bundle protocol）, LTP （Licklider transmission protocol）, CFDP （CCSDS file delivery protocol） and Saratoga, are given first. Then, the technical characteristics of DTN rou- ting algorithm and the software implementation of DTN are presented. Furthermore, the techni- cal characteristics of DTN flight validation experiments conducted by NASA under various mis- sion scenarios, including remote sensing, space station, relay communication and deep space exploration, are summarized. Finally, with regard to the development requirements of space- based integrated information network of China, DTN networking issues demanding more focus are given, including system architecture, convergence layer protocols, routing algorithm and the design of gateway.