星际互联网体系结构、模型与协议研究

As a special kind of dynamic network ,InterPlanetary Network(IPN) has the characters of large transmission delay, difficult control of packet jitter and loss, unpredictable transmission time , networks heterogeneous and random interference. Aimed at the reliable routing and efficient transmission requirements in the IPN, this project (1) studies the dynamic behaviors of the IPN, including the delay variations, the topological change rates, the link handoff models, the service features, the mechanism of packet losses, and the trust worthiness evolution of spatial nodes, establishes the dynamic behavior model of IPN; (2)proposes the new IPN network architecture and flat protocol architecture; (3)researches the adaptive perception model of IPN backbone network topology, investigates the strong constraints unicast and multicast routing protocol to support the QoS and reliable requirement; (4)explores the key factors which affect the transmission efficiency ,analyzes throughput model, researches the congestion control algorithm with error correction mechanisms and cross-layer optimization control, based on a combination of end to end and hop by hop, and proposes a new transmission protocol; (5)the simulation platform is developed to evaluate the availability and performance of the proposed algorithms and protocols..With our work, the project will not only explore new ideas and methods for the design of network architecture and protocol for IPN, but also provide a theoretical guidance for further explorations of space-earth network.

星际互联网作为一类特殊的动态网络，具有传输延迟、抖动、丢包难以控制、不可预测的传送时间、强异构以及随机干扰等特点。课题从影响高效路由与传输的基础性问题入手，1)重点分析星际互联网的时延特性、拓扑时变规律、业务特征、链路丢包机理、开放环境下节点安全性等问题，构建星际互联网的行为特征模型；2)提出适应于星际互联网的新型网络架构和扁平化协议体系；3)从QoS支持、安全可靠等方面研究星际骨干网拓扑自适应感知模型，提出强约束下的星际互联网单播和多播路由协议；4)从影响星际互联网传输效率的关键因素出发，分析动态链路传输协议的吞吐量模型、研究基于跳到跳和端到端相结合的具有纠错和跨层优化的拥塞控制算法，提出适用于星际互联网的新型高效传输协议；5）搭建星际组网与协议仿真平台，对模型和协议进行仿真与验证。课题开展将丰富目前星际互联网组网技术研究成果，为未来星地一体化组网提供技术支持。

未来的星际互联网络可以在多个行星之间进行数据传输。其中最大的挑战是具有长链路传播延时、高链路误码率、不持续链路连接和不对称链路带宽特性的深空骨干网络。大传播延时和高误码率使得传输效率下降，动态网络拓扑和不持续链路连接导致路由选择困难。本研究设计了深空骨干网络模型，以该模型为背景在拓扑发现、路由机制、传输控制机制和可靠传输机制方面提出了可行的解决思路，最后通过搭建星际互联网络验证平台对关键技术和协议进行评估和验证，为国家天地一体化网络建设和深空骨干网络的数据传输问题提供了思路和解决方法。