共查询到19条相似文献,搜索用时 126 毫秒
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应用粒子群优化的绿色虚拟网络映射算法 总被引:1,自引:0,他引:1
绿色网络是近年来网络技术研究的热点,以节能为优化目标的虚拟网络映射算法成为基于网络虚拟化技术中资源分配研究的重点.提出了应用粒子群优化的绿色虚拟网络映射算法,重定义粒子群优化算法中的参数和粒子进化行为,以关闭底层网络节点和链路数量最多为适应度函数,在较低的算法复杂度条件下,获得绿色虚拟网络映射的最优解.仿真结果表明,与对比算法相比,静态环境下所提算法的运行时间大幅度降低;动态环境下所提算法的节点关闭率、链路关闭率、虚拟网络请求接受率均有所提升,算法运行时间也大大缩短. 相似文献
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在两阶段虚拟网络映射算法的基础上,针对现有的HAS算法在节点映射阶段存在局限性的缺点,提出了一种基于HAS拓扑的虚拟网络映射算法。该算法融合了HAS拓扑的特征,对节点映射阶段做了优化和改进,在节点映射阶段充分考虑其对链路映射带来的影响,使节点映射到相对集中的区域,降低链路映射阶段的求解难度。仿真结果表明,所提出的算法与已有的算法相比,在虚拟网络请求接受率、平均时间收益和收益开销比等方面均有明显提高。 相似文献
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针对多个虚拟网络请求(Virtual Network Request,VNR)动态到达的网络场景,本文提出一种基于成本及功耗联合优化的软件定义网络(Software-Defined Networking,SDN)虚拟网络映射(Virtual Network Embedding,VNE)算法.在对虚拟节点及链路映射成本及功耗进行评估的基础上,建模VNE成本及功耗的代价函数,进而在满足资源需求等约束条件下,建模基于代价函数最小化的VNE模型.该优化问题为整数线性规划问题,难以直接求解;为解决此问题,提出基于时间窗的虚拟网络批处理映射策略动态处理在线请求.继而针对特定时间窗内的VNR,将其转换为虚拟节点映射子问题和虚拟链路映射子问题,并应用启发式算法对两个子问题分别进行求解,从而确定VNR映射策略.仿真结果表明,所提算法能显著减少VNE成本及功耗,提高VNR接受率. 相似文献
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针对多个虚拟网络请求(Virtual Network Request,VNR)动态到达的网络场景,本文提出一种基于成本及功耗联合优化的软件定义网络(Software-Defined Networking,SDN)虚拟网络映射(Virtual Network Embedding,VNE)算法.在对虚拟节点及链路映射成本及功耗进行评估的基础上,建模VNE成本及功耗的代价函数,进而在满足资源需求等约束条件下,建模基于代价函数最小化的VNE模型.该优化问题为整数线性规划问题,难以直接求解;为解决此问题,提出基于时间窗的虚拟网络批处理映射策略动态处理在线请求.继而针对特定时间窗内的VNR,将其转换为虚拟节点映射子问题和虚拟链路映射子问题,并应用启发式算法对两个子问题分别进行求解,从而确定VNR映射策略.仿真结果表明,所提算法能显著减少VNE成本及功耗,提高VNR接受率. 相似文献
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该文针对现有的虚拟网络映射算法对网络中节点的拓扑属性考虑不够周到,导致其请求接受率和收益开销比较低的问题,将物理学里的场论思想引入了虚拟网络映射,并提出一种基于拓扑势的虚拟网络映射算法。该算法在节点映射阶段,通过计算节点的拓扑势、节点的资源能力、待映射节点与已映射节点之间的距离,将虚拟节点映射至最佳的物理节点。在链路映射阶段,通过计算物理路径的可用带宽和路径跳数,将虚拟链路映射至最佳的物理路径。仿真实验表明,该算法在多种虚拟网络到达强度下的请求接受率和收益开销比均优于当前的虚拟网络映射算法。 相似文献
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基于拓扑划分的片上网络快速映射算法 总被引:1,自引:0,他引:1
该文针对片上网络建立了以能耗和流量均衡为优化目标的映射模型,提出一种基于拓扑划分的快速映射算法(TPBMAP)。该算法不仅考虑芯片的布局特性从而产生规整的拓扑,还采用虚拟IP核技术修正通信核图以完成IP核和网络节点数不等的映射;通过引入以流量均衡为目标的优化模型同时将通信量大的IP核映射到拓扑边缘区域,有效地降低了网络中心的流量;采用迭代的拓扑划分方法以及将通信量大的IP核映射到网络相邻位置,可快速完成低能耗映射。仿真结果表明,相比现有算法,该文提出的算法在映射速度、全网能耗以及网络中心流量等方面有较大优势。 相似文献
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网络虚拟化使得智能能量感知网络部署成为可能,已有研究忽略了节点映射能耗最优化。本文把节点映射能耗优化问题转化为生产地与销售地之间物资运输代价最优化问题,建立高效节能节点映射运输模型。根据最大元素法,提出了混合一阶段与两阶段映射算法,在链路映射的约束下找到节点分配最小能耗代价最优解;利用主动休眠策略,提出了基于运输模型的主动休眠虚拟网络映射节能算法;利用节点可重复映射技术,提出了基于运输模型的节点可重复映射算法,进一步提高了底层网络资源休眠数量。仿真结果验证了本文所提算法能够显著降低系统能耗,适合大规模高效节能虚拟网络映射。 相似文献
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Resource allocation mechanism in the TWDM-PON and C-RAN joint architecture with hybrid energy supply
Aiming at the problems of low resource utilization rate,high energy consumption and poor user service quality in the existing virtualized Cloud Radio Access Network,an energy-aware virtualized resource allocation mechanism with hybrid energy supply was proposed.According to the energy sources and energy consumption of different network devices,energy arrival and energy consumption models were established.Furthermore,under the premise of guaranteeing the quality of user services,considering proportional fairness and energy consumption optimization,distributed algorithms based on asynchronous update were used to allocate resources and harvested energy for different types of virtual cloud radio access networks and user virtual base stations to effectively improve the energy efficiency of network.The simulation results show that the proposed resource allocation mechanism can reduce energy consumption while effectively reducing the latency and improving the throughput. 相似文献
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Embedding and reconfiguration algorithms for service aggregation in network virtualization 下载免费PDF全文
Yiming Jiang Julong Lan Zhiming Wang Yuanyuan Deng 《International Journal of Communication Systems》2016,29(1):33-46
Network virtualization and transmission quality optimization are promising techniques for future Internet. Previous researches on virtual network embedding focused on efficient utilization of network resources. In this paper, we present a virtual network embedding scheme that aims at improving the effect of transmission quality optimization. In order to enable more service benefit from optimization, the embedding algorithm presented in this paper follows the service aggregation embedding principle. We also develop a reconfiguration algorithm based on service aggregation and load balance. Simulation experiments demonstrate that the proposed algorithms can achieve good performance on service aggregation as well as efficient resource utilization. Copyright © 2014 John Wiley & Sons, Ltd. 相似文献
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Aiming at the problem that the location distribution of cluster head nodes filtered by wireless sensor network clustering routing protocol was unbalanced and the data transmission path of forwarding nodes was unreasonable,which would increase the energy consumption of nodes and shorten the network life cycle,a clustering routing protocol based on improved particle swarm optimization algorithm was proposed.In the process of cluster head election,a new fitness function was established by defining the energy factor and position equalization factor of the node,the better candidate cluster head node was evaluated and selected,the position update speed of the candidate cluster head nodes was adjusted by the optimized update learning factor,the local search and speeded up the convergence of the global search was expanded.According to the distance between the forwarding node and the base station,the single-hop or multi-hop transmission mode was adopted,and a multi-hop method was designed based on the minimum spanning tree to select an optimal multi-hop path for the data transmission of the forwarding node.Simulation results show that the clustering routing protocol based on improved particle swarm optimization algorithm can elect cluster head nodes and forwarding nodes with more balanced energy and location,which shortened the communication distance of the network.The energy consumption of nodes is lower and more balanced,effectively extending the network life cycle. 相似文献
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首先深入分析了两种典型的分布式的节点定位算法,并从定位精度及能量消耗两个方面给出了定量分析结果。在此基础上提出了改进的定位算法,BB_RP算法。通过仿真试验,在定位精度和能量消耗两个方面与原有算法进行定量的分析比较。结果表明,BB_RP算法虽然在定位精度略低于原有的算法,但是在能量消耗和覆盖速度两个指标上有了较大的提高,使得无线传感器网络的生命周期延长。 相似文献
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提出一种无线体域网(WBAN, wireless body area network)的网络拓扑结构设计方案。该方案针对IEEE 802.15.6标准的2跳扩展星型拓扑结构,建立基于混合整数非线性规划的能耗成本优化模型,通过调整中继节点的位置和数量,以及数据到汇聚节点的路由,获得优化的网络拓扑结构。实验结果分析表明,与Elias提出的EAWD(energy aware WBAN design) 模型相比,所提出的方案能使网络能耗减少40.5%,网络时延平均降低52.4%,网络寿命提高了一倍。 相似文献