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Software-Defined Network (SDN) empowers the evolution of Internet with the OpenFlow, Network Virtualization and Service Slicing strategies. With the fast increasing requirements of Mobile Internet services, the Internet and Mobile Networks go to the convergence. Mobile Networks can also get benefits from the SDN evolution to fulfill the 5th Generation (5G) capacity booming. The article implements SDN into Frameless Network Architecture (FNA) for 5G Mobile Network evolution with proposed Mobile-oriented OpenFlow Protocol (MOFP). The Control Plane/User Plane (CP/UP) separation and adaptation strategy is proposed to support the User-Centric scenario in FNA. The traditional Base Station is separated with Central Processing Entity (CPE) and Antenna Element (AE) to perform the OpenFlow and Network Virtualization. The AEs are released as new resources for serving users. The mobile-oriented Service Slicing with different Quality of Service (QoS) classification is proposed and Resource Pooling based Virtualized Radio Resource Management (VRRM) is optimized for the Service Slicing strategy with resource-limited feature in Mobile Networks. The capacity gains are provided to show the merits of SDN based FNA. And the MiniNet based Trial Network with Service Slicing is implemented with experimental results. 相似文献
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软件定义网络(Software-Defined Networking,SDN)作为一种数据转发与控制逻辑相解耦、并开放底层编程接口的创新网络架构,为降低核心网的部署运营成本、提升应用业务性能提供了全新的解决思路.然而,在SDN架构下,逻辑上集中的控制平面容易出现性能瓶颈,进而加大分组转发时延,因此有必要理解其分组转发性能特性.为此,本文首先介绍了软件定义核心网的典型部署场景,分析了控制平面的Packet-in消息到达过程和数据平面的分组到达过程,进而应用M/M/n/m和M/M/1/m排队模型分别刻画控制器集群的Packet-in消息处理过程和OpenFlow交换机的分组处理过程.在此基础上,建立OpenFlow分组转发优先制排队模型,进而推导出不同优先级的分组转发时延及其累积分布函数CDF.最后,借助控制器性能测量工具OFsuite_Performance进行实验评估,结果表明:与现有模型相比,本文所提的M/M/n/m模型更能准确估计控制器集群的实际性能.同时,采用数值分析的方法对比了多种情况下不同优先级的分组转发时延及CDF曲线,为软件定义核心网的实际应用部署提供有效参考. 相似文献
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本文对无线数据网的体系和蜂房式无线数据网络系统的构成作了简要的分析,指出了蜂房式无线数据网络的主要关键性技术、特点及应用领域。 相似文献
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软件定义网络(SDN)采用OpenFlow技术分离网络设备的数据平面和控制平面,实现灵活控制网络资源的目的。基于此,设计了量子密码通信网络模型,实现灵活控制密码通信网络整体量子密匙资源,确保了信息的安全传输。此外,提出了综合到端可用密匙和跳数的路由算法,提高了QKD生成密匙的有效利用率。由测试结果可知,通过基于SDN的量子密码通信网络及路由算法,可提高量子密匙资源利用率,提高网络性能。 相似文献
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软件定义网络是一种数据和控制平面分离、软件可编程的新型网络架构及技术,控制平面使用以OpenFlow为代表的协议对转发平面进行集中式控制。SDN架构的这些特点能很好地满足了云计算对虚拟网络的集中化、标准化、自动化的配置管理要求。针对传统虚拟网络技术支持云计算平台的不足,提出基于OpenFlow的SDN技术设计虚拟网络的思路,论述了几种虚拟网络实现的原理与处理流程,并给出了模块化的软件设计及部分关键代码功能描述。 相似文献
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ZUO Qingyun CHEN Ming DING Ke XU Bo 《中国通信》2014,(2):55-64
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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在云计算时代,开放化、虚拟化的需求不断增加,将FTTx技术与SDN结合,构建软件定义的架构.是下一代接入网发展的方向。本文研究了基于SDN的接入网架构设计及关键技术,并对基于SDN的接入网的标准化现状进行了介绍。 相似文献
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Wireless bandwidth is a scarce resource in a cellular mobile network. As such, it is important to effectively allocate bandwidth to each cell such that the overall system performance is optimized. Channel allocation strategies have been extensively studied for voice communications in cellular networks. However, for data dissemination applications, studies on bandwidth allocation have thus far been limited to a single-cell environment. This paper investigates the problem of bandwidth allocation for data dissemination in a multi-cell environment, which, to the best of our knowledge, has not been investigated before. The performance objective is to minimize the overall expected access latency given the workload for each cell in a data dissemination system. Two heuristic techniques, called compact allocation and cluster-step allocation, are proposed to effectively allocate bandwidth for a cellular network. Simulation experiments are conducted to evaluate the performance of the proposed bandwidth allocation schemes. Experimental results show that the proposed schemes substantially outperform the uniform allocation and proportional allocation schemes. 相似文献
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软件定义网络(SDN)采用控制和转发的分离架构,使研究者可以通过软件实现任意的网络控制逻辑,而不需对网络设备本身进行修改,具备极强的灵活性,已经在路由决策、网络虚拟化、无线接入、云计算数据中心网络等领域得到研究和应用,成为一项热点技术。但SDN在蓬勃发展的同时,也引入了新的安全风险,带来新的安全问题。另一方面,SDN也给传统安全技术以冲击,带来创新的网络安全应用发展的机会。鉴于此,结合SDN网络架构的特点综述了SDN安全的研究现状,包括SDN安全风险分析和安全技术及应用,并思考了SDN对信息安全的意义。 相似文献
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Jens Voigt Andreas Steil Gerhard P. Fettweis 《Design Automation for Embedded Systems》1998,3(4):239-253
In this paper we introduce a discrete-event-based simulation technology suitable to model cellular mobile radio systems with respect to their dynamic behavior. The latter results in the need for simulation tools which support mutable system configurations. The problems encountered when modeling mutable system configurations using conventional discrete-event simulators are discussed. In order to show a possible solution to this problem we introduce configuration events and configuration objects into the theory of discrete-event simulations. We demonstrate how configuration objects can be implemented in a discrete-event simulator using a dynamic map-function, hereby extending a definition of higher order functions. We apply the configuration objects in a Multiple Layer Model for modeling an entire mobile cellular radio network in a discrete-event simulator as an application for the extended theory. In this model we use the configuration objects to change the network's configuration during runtime. We show that this solution—combined with an object-oriented software design and, possibly, a visual programming language—is a powerful tool for the simulation of the dynamic aspects of mobile cellular radio networks. The software technology presented will be applied by the German cellular network operator Mannesmann Mobilfunk to model dynamic features applicable to the radio resource management of mobile radio networks and to access their performance by simulation. 相似文献
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时代在进步,物联网已深入应用到社会产业体系,强化了我国各个社会产业体系的联系,且向服务行业渗透。我国的经济建设目标聚焦在物联网上,移动通信网络在物联网建设发挥了关键的作用。基于此,本文介绍了移动蜂窝物联网技术,详细研究了蜂窝物联网规划,希望为有关企业提供合理建议。 相似文献
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Software-defined network (SDN) separated the traditional control plane from the data plane,formed a centralized controller,opened up the network programming interface,simplified network management,promoted network innovation and optimized network operation.However,SDN's “three-layer two-interface” architecture increased the network attack surface,resulting in many new security issues.The development,characteristics and working principle of SDN were first introduced,and the existing security problems from the application layer,the northbound interface,the control plane,the southbound interface,the data plane were summarized respectively.Secondly,the latest research progress and existing solutions were discussed.Finally,SDN current and future security challenges were summarized,and the future SDN security development direction was looked forward to. 相似文献
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提出了一种SDN控制器——ZENIC,并给出了其架构。在控制、转发两个层面上,ZENIC架构主要包括转发抽象层及驱动层、网络操作系统内核层、北向应用编程接口。ZENIC采用了统一的转发抽象层加特定转发驱动、接入和内联网络分层控制的特色架构设计,解决了多种设备接入和复杂网络控制的问题。 相似文献
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传统切换算法不能适应多准则切换的要求,基于多准则切换算法的实现越来越重要,必须发展新的技术来提高切换算法的有效性,在用户满意度和网络效率间形成平衡。智能和优化切换算法对像集成自组网(Ad hoc)和蜂窝网络结构的混合网络具有很好的适应性和鲁棒性,能够根据未来混合网络中的各种业务类型的服务质量需求、网络状态以及移动节点条件等多种因素的变化进行自适应切换,可以运用这些智能优化算法来进行更加有效的切换判决,从而提高系统的性能。更进一步的研究方向是在集成Ad hoc和蜂窝网络的环境下,使用智能或优化技术设计垂直切换算法来提高系统整体性能。 相似文献