Network innovation and business transformation are both necessary for telecom operators to adapt to new situations, but operators face challenges in terms of network bearer complexity, business centralization, and IT/...Network innovation and business transformation are both necessary for telecom operators to adapt to new situations, but operators face challenges in terms of network bearer complexity, business centralization, and IT/CT integration. Network function virtualization （NFV） may inspire new development ideas, but many doubts still exist within industry, especially about how to introduce NFV into an operator＇ s network. This article describes the latest progress in NFV standardization, NFV requirements and hot technology issues, and typical NFV applications in an operator networks.展开更多
为提高现阶段广播网络的运营效率,在降低广播网络运维成本的同时提升直播信号的质量和用户体验,提出在电视广播中的直播场景及广播信号处理环节分别部署软件定义网络(Software Defined Network,SDN)和网络功能虚拟化(Network Function V...为提高现阶段广播网络的运营效率,在降低广播网络运维成本的同时提升直播信号的质量和用户体验,提出在电视广播中的直播场景及广播信号处理环节分别部署软件定义网络(Software Defined Network,SDN)和网络功能虚拟化(Network Function Virtualization,NFV)网络架构。利用回传网络采集多场馆的信号,根据实时流量情况动态分配网络资源,同时在应对突发事件或临时增加直播需求时,SDN快速重新配置网络,优化调度直播流量。基于SDN架构,在广播信号处理环节通过NFV技术虚拟化视频编转码和用户权限认证,确保信号处理和分发环节的高效性。展开更多
Virtualization of network/service functions means time sharing network/service（and affiliated）resources in a hyper speed manner.The concept of time sharing was popularized in the 1970s with mainframe computing.The s...Virtualization of network/service functions means time sharing network/service（and affiliated）resources in a hyper speed manner.The concept of time sharing was popularized in the 1970s with mainframe computing.The same concept has recently resurfaced under the guise of cloud computing and virtualized computing.Although cloud computing was originally used in IT for server virtualization,the ICT industry is taking a new look at virtualization.This paradigm shift is shaking up the computing,storage,networking,and ser vice industries.The hope is that virtualizing and automating configuration and service management/orchestration will save both capes and opex for network transformation.A complimentary trend is the separation（over an open interface）of control and transmission.This is commonly referred to as software defined networking（SDN）.This paper reviews trends in network/service functions,efforts to standardize these functions,and required management and orchestration.展开更多
With the advancements of software defined network(SDN)and network function virtualization(NFV),service function chain(SFC)placement becomes a crucial enabler for flexible resource scheduling in low earth orbit(LEO)sat...With the advancements of software defined network(SDN)and network function virtualization(NFV),service function chain(SFC)placement becomes a crucial enabler for flexible resource scheduling in low earth orbit(LEO)satellite networks.While due to the scarcity of bandwidth resources and dynamic topology of LEO satellites,the static SFC placement schemes may cause performance degradation,resource waste and even service failure.In this paper,we consider migration and establish an online migration model,especially considering the dynamic topology.Given the scarcity of bandwidth resources,the model aims to maximize the total number of accepted SFCs while incurring as little bandwidth cost of SFC transmission and migration as possible.Due to its NP-hardness,we propose a heuristic minimized dynamic SFC migration(MDSM)algorithm that only triggers the migration procedure when new SFCs are rejected.Simulation results demonstrate that MDSM achieves a performance close to the upper bound with lower complexity.展开更多
In this,communication world, the Network Function Virtualization concept is utilized for many businesses, small services to virtualize the network nodefunction and to build a block that may connect the chain, communic...In this,communication world, the Network Function Virtualization concept is utilized for many businesses, small services to virtualize the network nodefunction and to build a block that may connect the chain, communication services.Mainly, Virtualized Network Function Forwarding Graph (VNF-FG) has beenused to define the connection between the VNF and to give the best end-to-endservices. In the existing method, VNF mapping and backup VNF were proposedbut there was no profit and reliability improvement of the backup and mapping ofthe primary VNF. As a consequence, this paper offers a Hybrid Hexagon-CostEfficient algorithm for determining the best VNF among multiple VNF and backing up the best VNF, lowering backup costs while increasing dependability. TheVNF is chosen based on the highest cost-aware important measure (CIM) rate,which is used to assess the relevance of the VNF forwarding graph.To achieveoptimal cost-efficiency, VNF with the maximum CIM is selected. After the selection process, updating is processed by three steps which include one backup VNFfrom one SFC, two backup VNF from one Service Function Chain (SFC),and twobackup VNF from different SFC. Finally, this proposed method is compared withCERA, MinCost, MaxRbyInr based on backup cost, number of used PN nodes,SFC request utility, and latency. The simulation result shows that the proposedmethod cuts down the backup cost and computation time by 57% and 45% compared with the CER scheme and improves the cost-efficiency. As a result, this proposed system achieves less backup cost, high reliability, and low timeconsumption which can improve the Virtualized Network Function operation.展开更多
软件定义网络(Software Defined Network,SDN)和网络功能虚拟化(Network Function Virtualization,NFV)已经成为新一代网络体系结构的新范式。SDN和NFV可以有效地提高部署和管理服务功能链(Service Function Chains,SFCs)的灵活性。文...软件定义网络(Software Defined Network,SDN)和网络功能虚拟化(Network Function Virtualization,NFV)已经成为新一代网络体系结构的新范式。SDN和NFV可以有效地提高部署和管理服务功能链(Service Function Chains,SFCs)的灵活性。文中融合SDN和NFV,并应用到网络切片的资源优化中,为未来的5G三大业务场景实现定制服务的有效部署,提出了一种基于SDN和NFV的网络切片资源优化算法。首先针对5G uRLLC,eMBB,mMTC三大应用场景的不同业务需求,将底层的物理节点按照功能类型划分为三个虚拟子网的节点集合。然后根据不同应用场景的不同服务功能链的要求,分别对每一类的网络切片进行建模,形成混合整数线性规划的基于SDN和NFV的网络切片的数学模型,并提出了基于拉格朗日对偶分解的算法,将网络切片的数学模型转换为节点和链路的子问题,再对分解的子问题进行映射方案的求解。仿真结果表明,与以往算法相比,文中提出的算法在资源利用率、接受率、平均执行时间方面具有更好性能。展开更多
随着5G网络的迅猛发展,通信管网承载的流量压力日益增加,负载均衡成为解决网络拥塞、提高资源利用率以及优化用户体验的重要手段。围绕5G通信管网的负载均衡需求,深入探讨基于流量感知、资源分配及人工智能的智能化负载均衡策略,并分析...随着5G网络的迅猛发展,通信管网承载的流量压力日益增加,负载均衡成为解决网络拥塞、提高资源利用率以及优化用户体验的重要手段。围绕5G通信管网的负载均衡需求,深入探讨基于流量感知、资源分配及人工智能的智能化负载均衡策略,并分析多接入边缘计算(Multi-access Edge Computing,MEC)、软件定义网络(Software Defined Network,SDN)与网络功能虚拟化(Network Function Virtualization,NFV)技术、高效路由算法在负载均衡中的关键作用,为5G通信管网的高效运行提供技术支撑。展开更多
文摘Network innovation and business transformation are both necessary for telecom operators to adapt to new situations, but operators face challenges in terms of network bearer complexity, business centralization, and IT/CT integration. Network function virtualization （NFV） may inspire new development ideas, but many doubts still exist within industry, especially about how to introduce NFV into an operator＇ s network. This article describes the latest progress in NFV standardization, NFV requirements and hot technology issues, and typical NFV applications in an operator networks.
文摘为提高现阶段广播网络的运营效率,在降低广播网络运维成本的同时提升直播信号的质量和用户体验,提出在电视广播中的直播场景及广播信号处理环节分别部署软件定义网络(Software Defined Network,SDN)和网络功能虚拟化(Network Function Virtualization,NFV)网络架构。利用回传网络采集多场馆的信号,根据实时流量情况动态分配网络资源,同时在应对突发事件或临时增加直播需求时,SDN快速重新配置网络,优化调度直播流量。基于SDN架构,在广播信号处理环节通过NFV技术虚拟化视频编转码和用户权限认证,确保信号处理和分发环节的高效性。
文摘Virtualization of network/service functions means time sharing network/service（and affiliated）resources in a hyper speed manner.The concept of time sharing was popularized in the 1970s with mainframe computing.The same concept has recently resurfaced under the guise of cloud computing and virtualized computing.Although cloud computing was originally used in IT for server virtualization,the ICT industry is taking a new look at virtualization.This paradigm shift is shaking up the computing,storage,networking,and ser vice industries.The hope is that virtualizing and automating configuration and service management/orchestration will save both capes and opex for network transformation.A complimentary trend is the separation（over an open interface）of control and transmission.This is commonly referred to as software defined networking（SDN）.This paper reviews trends in network/service functions,efforts to standardize these functions,and required management and orchestration.
基金supported in part by the National Natural Science Foundation of China(NSFC)under grant numbers U22A2007 and 62171010the Open project of Satellite Internet Key Laboratory in 2022(Project 3:Research on Spaceborne Lightweight Core Network and Intelligent Collaboration)the Beijing Natural Science Foundation under grant number L212003.
文摘With the advancements of software defined network(SDN)and network function virtualization(NFV),service function chain(SFC)placement becomes a crucial enabler for flexible resource scheduling in low earth orbit(LEO)satellite networks.While due to the scarcity of bandwidth resources and dynamic topology of LEO satellites,the static SFC placement schemes may cause performance degradation,resource waste and even service failure.In this paper,we consider migration and establish an online migration model,especially considering the dynamic topology.Given the scarcity of bandwidth resources,the model aims to maximize the total number of accepted SFCs while incurring as little bandwidth cost of SFC transmission and migration as possible.Due to its NP-hardness,we propose a heuristic minimized dynamic SFC migration(MDSM)algorithm that only triggers the migration procedure when new SFCs are rejected.Simulation results demonstrate that MDSM achieves a performance close to the upper bound with lower complexity.
文摘In this,communication world, the Network Function Virtualization concept is utilized for many businesses, small services to virtualize the network nodefunction and to build a block that may connect the chain, communication services.Mainly, Virtualized Network Function Forwarding Graph (VNF-FG) has beenused to define the connection between the VNF and to give the best end-to-endservices. In the existing method, VNF mapping and backup VNF were proposedbut there was no profit and reliability improvement of the backup and mapping ofthe primary VNF. As a consequence, this paper offers a Hybrid Hexagon-CostEfficient algorithm for determining the best VNF among multiple VNF and backing up the best VNF, lowering backup costs while increasing dependability. TheVNF is chosen based on the highest cost-aware important measure (CIM) rate,which is used to assess the relevance of the VNF forwarding graph.To achieveoptimal cost-efficiency, VNF with the maximum CIM is selected. After the selection process, updating is processed by three steps which include one backup VNFfrom one SFC, two backup VNF from one Service Function Chain (SFC),and twobackup VNF from different SFC. Finally, this proposed method is compared withCERA, MinCost, MaxRbyInr based on backup cost, number of used PN nodes,SFC request utility, and latency. The simulation result shows that the proposedmethod cuts down the backup cost and computation time by 57% and 45% compared with the CER scheme and improves the cost-efficiency. As a result, this proposed system achieves less backup cost, high reliability, and low timeconsumption which can improve the Virtualized Network Function operation.
文摘软件定义网络(Software Defined Network,SDN)和网络功能虚拟化(Network Function Virtualization,NFV)已经成为新一代网络体系结构的新范式。SDN和NFV可以有效地提高部署和管理服务功能链(Service Function Chains,SFCs)的灵活性。文中融合SDN和NFV,并应用到网络切片的资源优化中,为未来的5G三大业务场景实现定制服务的有效部署,提出了一种基于SDN和NFV的网络切片资源优化算法。首先针对5G uRLLC,eMBB,mMTC三大应用场景的不同业务需求,将底层的物理节点按照功能类型划分为三个虚拟子网的节点集合。然后根据不同应用场景的不同服务功能链的要求,分别对每一类的网络切片进行建模,形成混合整数线性规划的基于SDN和NFV的网络切片的数学模型,并提出了基于拉格朗日对偶分解的算法,将网络切片的数学模型转换为节点和链路的子问题,再对分解的子问题进行映射方案的求解。仿真结果表明,与以往算法相比,文中提出的算法在资源利用率、接受率、平均执行时间方面具有更好性能。
文摘随着5G网络的迅猛发展,通信管网承载的流量压力日益增加,负载均衡成为解决网络拥塞、提高资源利用率以及优化用户体验的重要手段。围绕5G通信管网的负载均衡需求,深入探讨基于流量感知、资源分配及人工智能的智能化负载均衡策略,并分析多接入边缘计算(Multi-access Edge Computing,MEC)、软件定义网络(Software Defined Network,SDN)与网络功能虚拟化(Network Function Virtualization,NFV)技术、高效路由算法在负载均衡中的关键作用,为5G通信管网的高效运行提供技术支撑。
