针对列车通信网络制式单一、地理环境差、数据安全可靠传输难以得到保证的现状,调研铁路系统各业务的通信需求,提出一种基于软件定义网络(SDN,software defined network)和网络功能虚拟化(NFV,network functions virtualization)的铁路...针对列车通信网络制式单一、地理环境差、数据安全可靠传输难以得到保证的现状,调研铁路系统各业务的通信需求,提出一种基于软件定义网络(SDN,software defined network)和网络功能虚拟化(NFV,network functions virtualization)的铁路系统空天地融合网络体系架构。通过集中控制器管理底层铁路系统的物理设施,实现应用程序与物理基础设施的解耦,讨论了体系架构的设计细节,并对架构的协议需求、功能需求以及信息流等展开综述,给出空天地融合网络与其他单一制式网络覆盖的性能对比分析,并简要讨论了目前待解决的问题及解决方向。展开更多
In Future Space-Terrestrial Integrated Networks （FSTINs）, mobility is the norm rather than the exception, the current TCP/IP architecture is not competent. As a promising future network architecture, Named Data Netw...In Future Space-Terrestrial Integrated Networks （FSTINs）, mobility is the norm rather than the exception, the current TCP/IP architecture is not competent. As a promising future network architecture, Named Data Networking （NDN） can support content consumer mobility naturally, but the content producer mobility support remains a challenging problem. Most previous research simply considered this problem in terrestrial scenarios, which involve stable infrastructures to achieve node mobility management. In this paper, we consider the problem in an FSTIN scenario without special handover management infrastructures. Specifically, we propose a tracing-based producer mobility management scheme and an addressing-assisted forwarding method via NDN architecture. We formally describe Multi-Layered Satellite Networks via a Time Varying Graph model and define the foremost path calculating problem to calculate the route of space segment, as well as an algorithm that can function in both dense （connected） and sparse （delay/disruption tolerant） scenarios. Finally, we discuss the acceleration method that can improve the Space-Terrestrial Integrated forwarding efficiency. Performance evaluation demonstrates that the proposed scheme can support fast handover and efficient forwarding in the FSTIN scenario.展开更多
为各类飞行器提供互联网接入的主要技术方案可以分为卫星通信和地空宽带2种。当飞行器处于两者的重叠覆盖区域,采用多路径进行数据通信将有可能极大改善传输性能。针对上述飞行器多接入场景,该文提出了一种多路径传输优化方案DMPTCP(dyn...为各类飞行器提供互联网接入的主要技术方案可以分为卫星通信和地空宽带2种。当飞行器处于两者的重叠覆盖区域,采用多路径进行数据通信将有可能极大改善传输性能。针对上述飞行器多接入场景,该文提出了一种多路径传输优化方案DMPTCP(dynamic multipath transmission control protocol)。针对链路通断情况发现缓慢、数据分配效率低的问题,结合飞行轨迹可预测的特点,设计了一种基于链路通断状态预测的数据分配算法;并针对链路时延和丢包率差异大所导致的接收方乱序情况严重的问题,通过接收方同时在多条子流回复连接层否定确认信息,使得发送方能够快速获得接收方总体乱序情况并对丢包进行重传。仿真实验表明:DMPTCP在聚合带宽和接收方总体乱序情况两方面均明显优于现有多路径传输机制。展开更多
文摘针对列车通信网络制式单一、地理环境差、数据安全可靠传输难以得到保证的现状,调研铁路系统各业务的通信需求,提出一种基于软件定义网络(SDN,software defined network)和网络功能虚拟化(NFV,network functions virtualization)的铁路系统空天地融合网络体系架构。通过集中控制器管理底层铁路系统的物理设施,实现应用程序与物理基础设施的解耦,讨论了体系架构的设计细节,并对架构的协议需求、功能需求以及信息流等展开综述,给出空天地融合网络与其他单一制式网络覆盖的性能对比分析,并简要讨论了目前待解决的问题及解决方向。
基金supported by the National Natural Science Foundation of China (Nos. 61772385 and 61572370)
文摘In Future Space-Terrestrial Integrated Networks （FSTINs）, mobility is the norm rather than the exception, the current TCP/IP architecture is not competent. As a promising future network architecture, Named Data Networking （NDN） can support content consumer mobility naturally, but the content producer mobility support remains a challenging problem. Most previous research simply considered this problem in terrestrial scenarios, which involve stable infrastructures to achieve node mobility management. In this paper, we consider the problem in an FSTIN scenario without special handover management infrastructures. Specifically, we propose a tracing-based producer mobility management scheme and an addressing-assisted forwarding method via NDN architecture. We formally describe Multi-Layered Satellite Networks via a Time Varying Graph model and define the foremost path calculating problem to calculate the route of space segment, as well as an algorithm that can function in both dense （connected） and sparse （delay/disruption tolerant） scenarios. Finally, we discuss the acceleration method that can improve the Space-Terrestrial Integrated forwarding efficiency. Performance evaluation demonstrates that the proposed scheme can support fast handover and efficient forwarding in the FSTIN scenario.
文摘为各类飞行器提供互联网接入的主要技术方案可以分为卫星通信和地空宽带2种。当飞行器处于两者的重叠覆盖区域,采用多路径进行数据通信将有可能极大改善传输性能。针对上述飞行器多接入场景,该文提出了一种多路径传输优化方案DMPTCP(dynamic multipath transmission control protocol)。针对链路通断情况发现缓慢、数据分配效率低的问题,结合飞行轨迹可预测的特点,设计了一种基于链路通断状态预测的数据分配算法;并针对链路时延和丢包率差异大所导致的接收方乱序情况严重的问题,通过接收方同时在多条子流回复连接层否定确认信息,使得发送方能够快速获得接收方总体乱序情况并对丢包进行重传。仿真实验表明:DMPTCP在聚合带宽和接收方总体乱序情况两方面均明显优于现有多路径传输机制。
