In recent years,satellite networks have been proposed as an essential part of next-generation mobile communication systems.Software defined networking techniques are introduced in satellite networks to handle the grow...In recent years,satellite networks have been proposed as an essential part of next-generation mobile communication systems.Software defined networking techniques are introduced in satellite networks to handle the growing challenges induced by time-varying topology,intermittent inter-satellite link and dramatically increased satellite constellation size.This survey covers the latest progress of software defined satellite networks,including key techniques,existing solutions,challenges,opportunities,and simulation tools.To the best of our knowledge,this paper is the most comprehensive survey that covers the latest progress of software defined satellite networks.An open GitHub repository is further created where the latest papers on this topic will be tracked and updated periodically.Compared with these existing surveys,this survey contributes from three aspects:(1)an up-to-date SDN-oriented review for the latest progress of key techniques and solutions in software defined satellite networks;(2)an inspiring summary of existing challenges,new research opportunities and publicly available simulation tools for follow-up studies;(3)an effort of building a public repository to track new results.展开更多
The virtual network embedding/mapping problem is an important issue in network virtualization in Software-Defined Networking(SDN).It is mainly concerned with mapping virtual network requests,which could be a set of SD...The virtual network embedding/mapping problem is an important issue in network virtualization in Software-Defined Networking(SDN).It is mainly concerned with mapping virtual network requests,which could be a set of SDN flows,onto a shared substrate network automatically and efficiently.Previous researches mainly focus on developing heuristic algorithms for general topology virtual network.In practice however,the virtual network is usually generated with specific topology for specific purpose.Thus,it is a challenge to optimize the heuristic algorithms with these topology information.In order to deal with this problem,we propose a topology-cognitive algorithm framework,which is composed of a guiding principle for topology algorithm developing and a compound algorithm.The compound algorithm is composed of several subalgorithms,which are optimized for specific topologies.We develop star,tree,and ring topology algorithms as examples,other subalgorithms can be easily achieved following the same framework.The simulation results show that the topology-cognitive algorithm framework is effective in developing new topology algorithms,and the developed compound algorithm greatly enhances the performance of the Revenue/Cost(R/C) ratio and the Runtime than traditional heuristic algorithms for multi-topology virtual network embedding problem.展开更多
软件定义网络(software-defined networking,SDN)和网络功能虚拟化(network function virtualization,NFV)为电力物联网业务编排提供了实现方法。针对电力物联网时延敏感业务编排问题,首先,提出基于SDN/NFV的电力物联网业务编排架构,满...软件定义网络(software-defined networking,SDN)和网络功能虚拟化(network function virtualization,NFV)为电力物联网业务编排提供了实现方法。针对电力物联网时延敏感业务编排问题,首先,提出基于SDN/NFV的电力物联网业务编排架构,满足定制化需求。然后,考虑多虚拟网络功能(virtual network function,VNF)嵌入、服务功能链(service function chain,SFC)有序性、以及电磁干扰影响,提出基于升价匹配的多阶段多对一VNF嵌入(pricing matching-based multi-phase many to one VNF embedding,PMVE)算法,在每个阶段实现不同SFC链上排序相同的VNF集合与物理节点集合间的匹配,从而最小化业务服务总时延。最后,通过算例验证了方法的可行性和有效性,仿真结果表明,相较于传统的双边匹配算法,所提算法可降低业务服务总时延29.9%、降低平均等待时延36.1%,保障电力物联网时延敏感业务需求。展开更多
基金This work is supported by the Fundamental Research Funds for the Central Universities.
文摘In recent years,satellite networks have been proposed as an essential part of next-generation mobile communication systems.Software defined networking techniques are introduced in satellite networks to handle the growing challenges induced by time-varying topology,intermittent inter-satellite link and dramatically increased satellite constellation size.This survey covers the latest progress of software defined satellite networks,including key techniques,existing solutions,challenges,opportunities,and simulation tools.To the best of our knowledge,this paper is the most comprehensive survey that covers the latest progress of software defined satellite networks.An open GitHub repository is further created where the latest papers on this topic will be tracked and updated periodically.Compared with these existing surveys,this survey contributes from three aspects:(1)an up-to-date SDN-oriented review for the latest progress of key techniques and solutions in software defined satellite networks;(2)an inspiring summary of existing challenges,new research opportunities and publicly available simulation tools for follow-up studies;(3)an effort of building a public repository to track new results.
文摘The virtual network embedding/mapping problem is an important issue in network virtualization in Software-Defined Networking(SDN).It is mainly concerned with mapping virtual network requests,which could be a set of SDN flows,onto a shared substrate network automatically and efficiently.Previous researches mainly focus on developing heuristic algorithms for general topology virtual network.In practice however,the virtual network is usually generated with specific topology for specific purpose.Thus,it is a challenge to optimize the heuristic algorithms with these topology information.In order to deal with this problem,we propose a topology-cognitive algorithm framework,which is composed of a guiding principle for topology algorithm developing and a compound algorithm.The compound algorithm is composed of several subalgorithms,which are optimized for specific topologies.We develop star,tree,and ring topology algorithms as examples,other subalgorithms can be easily achieved following the same framework.The simulation results show that the topology-cognitive algorithm framework is effective in developing new topology algorithms,and the developed compound algorithm greatly enhances the performance of the Revenue/Cost(R/C) ratio and the Runtime than traditional heuristic algorithms for multi-topology virtual network embedding problem.
文摘软件定义网络(software-defined networking,SDN)和网络功能虚拟化(network function virtualization,NFV)为电力物联网业务编排提供了实现方法。针对电力物联网时延敏感业务编排问题,首先,提出基于SDN/NFV的电力物联网业务编排架构,满足定制化需求。然后,考虑多虚拟网络功能(virtual network function,VNF)嵌入、服务功能链(service function chain,SFC)有序性、以及电磁干扰影响,提出基于升价匹配的多阶段多对一VNF嵌入(pricing matching-based multi-phase many to one VNF embedding,PMVE)算法,在每个阶段实现不同SFC链上排序相同的VNF集合与物理节点集合间的匹配,从而最小化业务服务总时延。最后,通过算例验证了方法的可行性和有效性,仿真结果表明,相较于传统的双边匹配算法,所提算法可降低业务服务总时延29.9%、降低平均等待时延36.1%,保障电力物联网时延敏感业务需求。
