共查询到17条相似文献，搜索用时 60 毫秒
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软件定义无人机自组网场景下,相较于软件定义有线网络,其网内节点数量更多导致各节点流表数量爆发式增长。针对原OpenFlow v1.5协议中主动下发流表的机制与flow_mod消息结构对于无线环境与多跳流表下发的不兼容,导致无人机自组网场景下流表下发开销过大以及收包率降低。对于无人机自组网场景下OpenFlow v1.5协议中的问题,通过组播切包组包去尾策略与流表源、目的地址自适应压缩策略,减少了头部开销,提升了无线资源利用率,并减少了冗余的流表项部分,在保证功能不缩减的情况下较显著地减少了开销。OPENET 14.5仿真验证显示,此机制大幅减少了网络控制开销,提高了网络吞吐量,降低了端到端时延与丢包率。 相似文献
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针对高动态无人机自组网中节点之间链路生存时间(Link Live Time,LLT)短和节点遭遇路由空洞次数多的问题,提出了一种基于空洞节点检测的可靠无人机自组网路由协议——GPSR-HND(Greedy Perimeter Stateless Routing Based on Hollow Node Detection).GPSR-HND协议中,转发节点通过空洞节点检测机制检测邻居节点状态,将有效邻居节点加入待选邻居节点集;然后基于层次分析法(Analytic Hierarchy Process,AHP)的多度量下一跳节点选择机制从待选邻居节点集中选择权重最大的邻居节点贪婪转发数据;如果待选邻居节点集为空,则从空洞邻居节点集中选择权重最大的空洞节点启动改进的周边转发机制,寻找可恢复贪婪转发模式的节点.与GPSR-NS协议和GPSR协议相比,GPSR-HND协议表现出了更好的性能,包括平均端到端时延和丢包率的改善,以及吞吐量的提高. 相似文献
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孟祥迪 《电子技术与软件工程》2018,(11):21-22
PTN在智能电网建设中大规模部署,较好地满足了电网管理业务和生产业务的承载需求。随着网络面向互联网为中心的业务高速发展,对智能电网传送网也提出了新的需求:一是业务快速开通,尤其是跨域业务开通;二是网络带宽实时调,等等。而现有的PTN网络很难满足上述要求。因此,在现有PTN网络基础上引入SDN（软件定义网络）技术,为PTN网络提供智能化控制平面技术,将PTN网络升级为SPTN,提高网络的智能化、资源利用率。 相似文献
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软件定义网络（Software Defined Network,SDN）依靠着其集中控制、可编程性和数控分离等优点,能够有效解决无人机网络（Flying Ad Hoc Network,FANET）面临的任务拓扑高度变化、网络链路连接不稳定、网络安全防护脆弱以及应用程序的异构性等问题,极大地提升FANET的灵活性和可靠性。针对SDN架构与FANET的结合问题,描述了SDN的体系架构,并以SDN控制器部署方式为关注点分类别概括了近几年软件定义无人机网络（Software-defined Flying Ad Hoc Network,SD-FANET）的研究进展,重点阐述了结合移动边缘计算（Mobile Edge Computing,MEC）的SD-FANET研究现状,最后指出了SD-FANET的应用场景和一些具体的未来研究方向。 相似文献
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提出了一种基于AODV的节能路由算法EBF-AODV.该算法在路由发现过程中,源节点设置一个阈值,中间节点根据本节点拓扑变化情况决定如何处理路由请求分组,目的节点综合考虑路径上的可用能量和路由跳数,选择最佳路径.通过仿真证明了该算法的有效性. 相似文献
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互联网和IT化的发展,给运营商带来了前所未有的机遇和挑战。通信网和IT化技术融合,有助于解决新业务发展面临的问题。为此,分析现阶段云网专线业务调度方式存在业务部署周期较长的情况,提出传输网引入软件定义网络（Software Defined Network,SDN）架构的方案,通过新旧调度模式的对比说明软件定义的分组传送网（Software Defined Packet Transport Network,SPTN）智能调度为云网专线的建设和维护带来的效率提升。 相似文献
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3G/4G网络改变了人民的生活习惯,人民利用PC和手持终端,享受着技术带来的便利和快捷.5G技术改变了整个社会.数字经济时代到来,5G技术构建了全新的生态性、智慧性系统,深度融合各行业,满足了多样化终端需求.介绍了5G承载网需求及变化;重点分析了分段路由(Segment Routing,SR)技术;5G承载网络体系的逐... 相似文献
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为了解决软件定义无人机自组网(Software-defined Unmanned Aerial Vehicle Ad Hoc Network, SDUANET)中转发黑洞和更新轮次问题,提出了一种软件定义无人机自组网快速一致性更新机制(Software-defined Unmanned Aerial Vehicle Ad Hoc Network Fast Consistent Update Mechanism, SDUANET-FCU)。新机制首先对节点进行分类操作,对可能会导致转发黑洞的发送操作进行约束;其次,针对含有两个规则的节点提出一种基于混合规则的两轮一致性更新策略;最后,将计算得出的Flow-mod发送顺序整合到两轮更新顺序中。仿真结果表明,在软件定义无人机自组网场景下,相比于现有的软件定义网络(Software Defined Network, SDN)更新方法,SDUANET-FCU降低了转发黑洞的概率和控制消息的数量,减少了平均更新轮次。 相似文献
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Software-Defined Networking(SDN)adapts logically-centralized control by decoupling control plane from data plane and provides the efficient use of network resources.However,due to the limitation of traditional routing strategies relying on manual configuration,SDN may suffer from link congestion and inefficient bandwidth allocation among flows,which could degrade network performance significantly.In this paper,we propose EARS,an intelligence-driven experiential network architecture for automatic routing.EARS adapts deep reinforcement learning(DRL)to simulate the human methods of learning experiential knowledge,employs the closed-loop network control mechanism incorporating with network monitoring technologies to realize the interaction with network environment.The proposed EARS can learn to make better control decision from its own experience by interacting with network environment and optimize the network intelligently by adjusting services and resources offered based on network requirements and environmental conditions.Under the network architecture,we design the network utility function with throughput and delay awareness,differentiate flows based on their size characteristics,and design a DDPGbased automatic routing algorithm as DRL decision brain to find the near-optimal paths for mice and elephant flows.To validate the network architecture,we implement it on a real network environment.Extensive simulation results show that EARS significantly improve the network throughput and reduces the average packet delay in comparison with baseline schemes(e.g.OSPF,ECMP). 相似文献
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随着网络规模的不断增大以及网络复杂度的不断提高,传统路由算法面对网络流量在时空分布上的剧烈波动难以兼顾计算复杂度和算法效率.近年来,随着软件定义网络和人工智能技术的兴起,基于机器学习的自动路由策略生成逐渐受到关注.本文提出一种基于深度增强学习的智能路由技术SmartPath,通过动态收集网络状态,使用深度增强学习自动生成路由策略,从而保证路由策略能够动态适应网络流量变化.实验结果表明,本文所提出的方案能够不依赖人工流量建模动态更新网络路由,在测试环境下比当前最优方案减少至少10%的平均端到端传输时延. 相似文献
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Liljana Gavrilovska 《Wireless Personal Communications》2006,37(3-4):271-290
Wireless ad hoc networks are temporary formed, infrastructureless networks. Due to the unstable channel conditions and network connectivity, their characteristics impose serious challenges in front of network designers. The layering approach to network design does not fit the ad hoc environment well. Therefore, various cross-layering approaches, where protocol layers actively interact, exchange inherent layer information and fine tune their parameters according to the network status are becoming increasingly popular. This paper presents an in-depth analysis of the latest cross-layering approaches for wireless ad hoc networks supported by several examples. A special emphasis is put on the link and network layer related cross-layer designs. Several link adaptation and efficient service discovery schemes are elaborated through analytical and simulation studies. Their performance shows the potentials of the cross-layering for boosting system characteristics in wireless ad hoc networks.
Liljana Gavrilovska currently holds a position of full professor at Faculty of Electrical Engineering, University “St. Cyril and Metodij” – Skopje, Macedonia. She is chief of Telecommunications Laboratory and teaches undergraduate courses in telecommunication networks, data transmission and switching and traffic theory, and graduate courses in wireless, mobile and personal networks, teletraffic engineering and planning, and broadband multiservices networks. In 2000 she joined the Center for PersonKommunikation, Aalborg University, Denmark, as a visiting professor and during 2001--2002 she held a position of associate research professor at the same university. Currently she holds a part-time position of associated research professor with Center for Teleinfrastructur (CTIF). Prof. Gavrilovska was involved in several EU (ACTS ASAP, IST PACWOMAN, MAGNET, TEMPUS) and national/international projects. She published numerous conference and journal papers and participated in several workshops. At the moment she is working on the book “Ad Hoc Networking Towards Seamless Communications” together with prof. R. Prasad. Her research interests include wireless and personal area networks, ad hoc networking, networking protocols, traffic analysis, QoS, and optimization techniques. She is a senior member of IEEE and serves as a Chair of Macedonian Communication Chapter. 相似文献
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针对城市道路环境下车载自组织网( VANETs)中通信性能下降以及数据传输失败的问题,提出了一种基于蚁群算法的延迟感知路由( ACDR)协议。首先,建立双向车道的数学延迟模型;然后,根据提出的端点十字路口( EI)的概念,ACDR利用蚁群优化( ACO)寻找最佳路线,其中前向蚂蚁根据本地路段延迟以及当前十字路口与目的节点的端点十字路口之间的全局时延来选择路径,后向蚂蚁则负责在返回路径时更新信息素,同时,相邻十字路口之间利用贪婪转发算法进行数据包的传递。最后仿真比较了ACDR协议与连通性感知路由( CAR)协议的性能,结果表明提出的ACDR协议的数据包的传输延迟小,丢包率低,通信性能好。 相似文献
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Jeroen Hoebeke Gerry Holderbeke Ingrid Moerman Bart Dhoedt Piet Demeester 《Wireless Personal Communications》2006,38(1):125-141
The fact that a lot of applications require secure communication to take place only between a dynamic subset of distributed devices sharing a common context, is, from a network point of view, very challenging and demanding. Existing technologies such as VPN, P2P overlays or VLANs can only partially respond to these requirements. This observation is the key factor that has driven the proposal of the virtual private ad hoc network concept. Virtual private ad hoc networks (VPAN) are secure and self-organizing overlay networks on top of existing IP infrastructure that use ad hoc networking techniques to enable network connectivity. The underlying IP infrastructure can be the Internet, cellular networks, ad hoc networks, mesh networks … or combinations thereof. A virtual private ad hoc overlay network creates a transparent, shielded and trusted environment for the applications and services running on the participants' devices. The overlay uses internal addressing and ad hoc routing, thereby forming a virtual network on top of the physical infrastructure. In addition, the overlay must be self-organizing and self-maintaining upon member mobility or membership changes. This paper gives an overview of the potential applications, a high-level network architecture and the network challenges emerging from the novel concept of virtual private ad hoc networking. Jeroen Hoebeke was born in Ghent, Belgium in 1979. In 2002 he received the Masters degree in engineering (Computer Science) from the University of Ghent. In August 2002, he joined the Broadband Communications Networks Group. His PhD research includes the development of adaptive routing protocol techniques for mobile ad hoc networks. His main research interests are in ad hoc wireless communications and, more generally, in broadband wireless communications. Within the European MAGNET project, he is actively involved in the development of a network architecture and demonstrator for Personal Networks, with a prime focus on routing and connectivity. Gerry Holderbeke was born in Zottegem, Belgium in 1982. He graduated in Informatics at the University of Ghent in 2004. In August 2004 he joined the Broadband Communications Networks Group where he is currently working as a project developer. His research currently includes the development of an emulator for mobile ad hoc networks. His main research interests are in ad hoc networks and broadband wireless communications and involve routing, addressing and more generally, communication within mobile ad hoc networks and infrastructured networks. Within the European MAGNET project, he is actively involved in the development of a network architecture for Personal Networks, with a prime focus on the implementation of the routing architecture. Ingrid Moerman was born in Gent, Belgium in 1965. She received the degree in Electro-technical Engineering and the Ph.D degree from the Ghent University, Gent, Belgium in 1987 and 1992, respectively. Since 1987, she has been with the Interuniversity Micro-Electronics Centre (IMEC) at the Department of Information Technology (INTEC) of the Ghent University, where she conducted research in the field of optoelectronics. In 1997, she became a permanent member of the Research Staff at IMEC. Since 2000 she is part-time professor at the Ghent University. Since 2001 she has switched her research domain to broadband communication networks. She is currently involved in the research and education on broadband mobile & wireless communication networks and on multimedia over IP. The main research topics related to mobile & wireless communication networks are: wireless access to vehicles (high bandwidth & driving speed), adaptive QoS routing in wireless ad hoc networks, body area networks, protocol boosting on wireless links, design of fixed access/metro part, traffic engineering and QoS support in the wireless access network. Ingrid Moerman is author or co-author of more than 300 publications in the field of optoelectronics and communication networks. Bart Dhoedt received a degree in Engineering from the Ghent University in 1990. In September 1990, he joined the Department of Information Technology of the Faculty of Applied Sciences, University of Ghent. His research, addressing the use of micro-optics to realize parallel free space optical interconnects, resulted in a PhD degree in 1995. After a 2 year post-doc in opto-electronics, he became professor at the Faculty of Applied Sciences, Department of Information Technology. Since then, he is responsible for several courses on algorithms, programming and software development. His research interests are software engineering and mobile & wireless communications. Bart Dhoedt is author or co-author of approximately 70 papers published in international journals or in the proceedings of international conferences. His current research addresses software technologies for communication networks, peer-to-peer networks, mobile networks and active networks. Piet Demeester received the Masters degree in Electro-technical engineering and the Ph.D degree from the Ghent University, Gent, Belgium in 1984 and 1988, respectively. In 1992 he started a new research activity on broadband communication networks resulting in the IBCN-group (INTEC Broadband communications network research group). Since 1993 he became professor at the Ghent University where he is responsible for the research and education on communication networks. The research activities cover various communication networks (IP, ATM, SDH, WDM, access, active, mobile), including network planning, network and service management, telecom software, internetworking, network protocols for QoS support, etc. Piet Demeester is author of more than 300 publications in the area of network design, optimization and management. He is member of the editorial board of several international journals and has been member of several technical program committees (ECOC, OFC, DRCN, ICCCN, IZS, &). 相似文献
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Stimulating Cooperation in Self-Organizing Mobile Ad Hoc Networks 总被引：24，自引：0，他引：24
In military and rescue applications of mobile ad hoc networks, all the nodes belong to the same authority; therefore, they are motivated to cooperate in order to support the basic functions of the network. In this paper, we consider the case when each node is its own authority and tries to maximize the benefits it gets from the network. More precisely, we assume that the nodes are not willing to forward packets for the benefit of other nodes. This problem may arise in civilian applications of mobile ad hoc networks. In order to stimulate the nodes for packet forwarding, we propose a simple mechanism based on a counter in each node. We study the behavior of the proposed mechanism analytically and by means of simulations, and detail the way in which it could be protected against misuse. 相似文献
