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正Amajor recent development in computer networking is the emergence of Software Defined Networking(SDN),whose goal is to provide a centralized,programmable control plane that is decoupled from the distributed data planes on individual network devices.In particular,the development of OpenFlow has demonstrated many potential benefits of SDN,and multiple vendors have started to offer commercial switches supporting the OpenFlow standard.Researchers have also made progress on SDN components including SDN controllers, 相似文献
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目前,由于现代通信技术的不断发展,居民的生活方式也变得多种多样,可以说是发生了翻天覆地的变化.众所周知,对于网络的灵活性能而言,其一大部分的成因都来自于软件定义网络(SDN)数控分割的建设思想和方式.本文把移动通信和SDN融合为一体进行介绍,详细的指出并证实SDN对于移动通信的发展具有不可估量的意义,另外,这篇论文还将OpenFlow协议所指出的理念:基于SDN移动通信网络整体下的负载平衡模式给出最合理的建设方案;在本文的结尾,笔者指出SDN对于无线资源向虚拟化发展所处的优点和下一步的进行计划. 相似文献
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By decoupling control plane and data plane,Software-Defined Networking(SDN) approach simplifies network management and speeds up network innovations.These benefits have led not only to prototypes,but also real SDN deployments.For wide-area SDN deployments,multiple controllers are often required,and the placement of these controllers becomes a particularly important task in the SDN context.This paper studies the problem of placing controllers in SDNs,so as to maximize the reliability of SDN control networks.We present a novel metric,called expected percentage of control path loss,to characterize the reliability of SDN control networks.We formulate the reliability-aware control placement problem,prove its NP-hardness,and examine several placement algorithms that can solve this problem.Through extensive simulations using real topologies,we show how the number of controllers and their placement influence the reliability of SDN control networks.Besides,we also found that,through strategic controller placement,the reliability of SDN control networks can be significantly improved without introducing unacceptable switch-to-controller latencies. 相似文献
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国家广电总局通讯网络系统正在试验的软交换系统和多业务接入系统是下一代网络(NGN)中的主要设备。通过此次试验,可使广电系统人员了解当今电信运营商是如何实现三网合一业务的.同时为广电业务提供了一个新的试验平台。 相似文献
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The control and data planes are decoupled in software-defined networking(SDN),which enables both planes to evolve independently,and brings about many advantages such as high flexibility,programmability,and rapid implementation of new network protocols.However,in order to improve the scalability of the control plane at present,some control functionalities are added to the data plane,which is probably to impact on the generality of the data plane.The key challenge of adding control functionalities to the data plane is to strike a careful balance between the generality of the data plane and the scalability of the control plane.We propose some basic principles that both control and data planes should comply with,based on the evolutionary trend of SDN.Moreover,we take two approaches for reference according to the principles,viewed from the control messages in OpenFlow-based SDN.Our evaluations demonstrate that the approaches can maintain the generality of the data plane and improve the scalability of the control plane. 相似文献
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简要阐述了NGN业务平台的必要性,介绍了NGN业务平台的现状及体系演进路线,对业务融合的未来发展进行了展望。 相似文献
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Software-Defined Network architecture offers network virtualization through a hypervisor plane to share the same physical substrate among multiple virtual networks.However,for this hypervisor plane,how to map a virtual network to the physical substrate while guaranteeing the survivability in the event of failures,is extremely important.In this paper,we present an efficient virtual network mapping approach using optimal backup topology to survive a single link failure with less resource consumption.Firstly,according to whether the path splitting is supported by virtual networks,we propose the OBT-Ⅰ and OBT-Ⅱ algorithms respectively to generate an optimal backup topology which minimizes the total amount of bandwidth constraints.Secondly,we propose a Virtual Network Mapping algorithm with coordinated Primary and Backup Topology(VNM-PBT)to make the best of the substrate network resource.The simulation experiments show that our proposed approach can reduce the average resource consumption and execution time cost,while improving the request acceptance ratio of VNs. 相似文献
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"下一代通信技术和计算机技术对广播电视发展的影响"项目组 《电视技术》2007,31(10):4-6,9
数字媒体网络是网络融合的新趋势。它更侧重于业务层面的融合,以媒体业务为中心设计网络体系和协议算法。其研究的主要内容包括网络体系结构的多维可扩展性、网络异构性、信息表示与应用格式的通用性与兼容性、数字媒体网络的安全性等。数字媒体网络对媒体应用的关注更为集中,因此,与广播电视领域的关系也更为密切,可较好地涵盖新媒体业务类型。 相似文献
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"下一代通信技术和计算机技术对广播电视发展的影响"项目组 《电视技术》2007,31(9):4-5
(接上期第34页) 3 三网融合 3.1 三网融合的概念与内涵 三网融合是20世纪90年代提出的概念.三网融合的目标是通过尽量简单的网络为用户提供比现在更为丰富的业务,并实现对网络和业务更全面的监管. 相似文献
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"下一代通信技术和计算机技术对广播电视发展的影响"项目组 《电视技术》2007,31(8):4-8,34
(接上期第9页) 1.3.2 层次化的协议体系 在20世纪70年代计算机网络体系结构研究处于初始阶段,体系结构研究是计算机系统制造商为保证其产品自成体系、前后兼容而进行的.当时的网络体系结构面向产品开发,详细定义了网络系统组成的构件以及构件之间的接口,这种指导思想造就了大量的异构网络系统. 相似文献
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文章首先分析了网络技术的发展趋势,包括固定数据网的总体发展趋势及其目标架构、各层次网络的发展趋势,接下来分析了业务的发展趋势并进行了展望,最后分析了不同层次网络包括骨干网、城域核心网、城域业务控制层、城域接入网、宽带接入网的最新技术进展。 相似文献
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一、NGN的需求
下一代网络(NGN)怎么发展?这是当前通信界十分关注的一个焦点。在经过一番较长时间的激烈争论后,人们终于选了以IP为主的网络技术。这是因为历史的经验告诉人们:业务需求和市场需求才是技术发展的主要驱动力。现在的问题是利用IP技术如何实现NGN。 相似文献
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下一代网络(NGN,Next,Generation Network)将是基于TDM(时分复用)的PSTN(公众交换电话网络)语音网络和基于IP/ATM的分组网络融合的产物。它将语音分组化,承载了原有PSTN网络的所有业务,同时又以IP技术的新特性增加和增强了许多新老业务,使得语音、视频、数据等综合业务的使用成为可能,是电信网络的发展方向。 相似文献
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首先简要描述了OSA/Parlay、应用服务器等相关技术.然后阐述了电话名片业务的设计与实现。并给出了简要测试分析报告。 相似文献
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