Mobility label based network: Mobility support in label switched networks with multi-protocol BGP

To support mobility the network control plane is required to detect changes in the mobile node’s location and distribute the new location information throughout the network thus enabling the forwarding plane to deliver traffic in an optimal manner. The network responsiveness to the mobile node movements can be generally thought of as the time elapsed between the moment the node’s location in the network has changed and the moment the reception of packets in the new location has resumed. This paper outlines an approach to handling the user mobility at the network layer in the context of multi-protocol label switched networks (MPLS). This new approach does not rely on the existing IP mobility management protocols such as Mobile IP and is instead based on the combination of multi-protocol BGP (MP-BGP) and MPLS. This paper proposes to introduce new protocol elements to MP-BGP to achieve mobility label distribution at the network control plane and the optimal packet delivery to the mobile node by the network forwarding plane using MPLS regardless of the IP protocol addressing and the associated logical network topology.     

基于包转发的电话会议系统的研究与实现

针对目前电话会议系统应用的普及以及所存在的一些弊端,提出一种新型的电话会议实现方式--基于包转发技术的电话会议技术实现方式.包转发技术不对通信双方的语音和信令数据作任何处理,只将信息透明的传输到通信对方端,而语音和信令数据的处理完全交给计算机上的软件来完成.给出了包转发及其相关的技术,在此基础上设计并实现了一种基于PSTN信令和以太网技术的电话会议基础平台.对系统进行了相关的测试,测试结果表明,所设计的系统可实现电话会议系统的基本功能.     

基于J2EE规范的电信综合网管架构设计

J2EE（JAVA 2 Enterprise Edition）是SUN公司提出的JAVA技术规范,它也是一个分布式系统的设计和开发环境,提供了基于组件的,以服务器为中心的多层应用体系结构.网络管理系统是对计算机网络、设备、软件等进行管理的软件系统,其主要功能包括性能管理、配置管理、故障管理、记帐管理和安全管理.在J2EE规范下实现网管系统可以很好的满足组件化、易于构建、分布部署等要求.针对J2EE的特点,根据TMN网管系统的要求,结合实例,本文探讨了如何在J2EE规范下进行电信综合网管平台的架构设计.     

机会网络中基于陌生节点的竞争转发策略

针对机会网络中存在自私节点导致消息的传送成功率偏低、开销大、延迟高,考虑到节点在其社会属性存在的情况下,提出基于陌生节点的竞争转发算法—BSCP(based on stranger competition algorithm).重点分析消息转发过程中利用节点的属性制定相应的转发策略,通过节点的陌生性,设置陌生节点在整个环境中的比例值,计算节点相遇的最大陌生值并排序,设计节点竞争策略使得数据转发成功率提高.仿真验证了BSCP算法的有效性,与STRON、Epidemic及BSIF等算法相比,该算法能有效保证消息传送成功率,减少由于节点自私性产生的消息丢失和碰撞现象,提高吞吐量,降低网络开销和延迟.     

Agent mobility architecture based on IEEE-FIPA standards

Mobile agents are autonomous software entities driven by a set of goals and tasks. Reactivity, social ability, autonomy, the ability to move to different network locations, and the weak agent notion of proactiveness, allow for autonomous processing of distributed information according to their environment (context awareness).Although agent mobility has been devised for homogeneous environments, deployment of agent mobility in heterogeneous environments has been hindered by the absence of a common set of interoperation rules and ontologies for different agent middlewares.In this article, an agent migration model based on the communication standards of the IEEE-FIPA organisation is proposed. The approach described encompasses the definition of several specifications to achieve interoperability in the migration process in heterogeneous environments.The model provides a basic and extensible common migration process, which is flexible enough to support different kinds of migration methods and future upgrades. It is completely independent of any specific middleware implementation.     

基于AI的LEO卫星网络资源管理架构设计

低轨(LEO)卫星作为天地一体化信息网络中天地信息传输的重要枢纽,具有规模大、链路损耗小、传输时延低等特点,已成为天地一体化信息网络研究领域的热点。提出了一种基于人工智能(AI)的LEO卫星网络资源管理架构设计,基于天地一体化信息网络架构,在地面引入软件定义网络(SDN)实现对卫星网络资源状态信息进行实时观测,再结合网络大脑(Network Mind)并应用人工智能算法学习得到资源分配优化策略,实现高效信息传输。     

Mesh网络中基于效用转发的路由恢复算法

在文献[10]的无线M esh网络路由算法的基础上,提出一种改进的基于效用转发的路由快速恢复算法,根据不同网络环境下影响效用值的各因素所占权重不同的特点,利用节点的历史通信数据,动态获取权重值,使算法能更好适应真实的网络环境;综合利用网络时延、节点效用值和节点之间的跳数,选择最优的下一跳转发节点,减少网络中不必要的时延...     

拍卖机制的包转发路由模型及其仿真研究

本文结合拍卖博弈的思想,考虑到对整个传感器网络路由有影响的各种有关参数,给出了一种以拍卖博弈形式的包转发路由算法流程,通过该算法流程可以达到高效地促进多个节点的相互合作,从而有效地减少控制包在传输过程中的次数,全面有效地实现多个分布式的科学控制,并充分利用NS2平台作为对拍卖博弈算法进行仿真验证,对整个实验结果进行对比分析。     

基于节点编码感知的机会转发路由协议

针对现有考虑节点编码机会的编码感知路由协议Ex CAR(a coding-aware routing protocol termed extended coding aware routing)在无线链路不稳定的情况下转发节点集内的节点在计算编码机会时可能产生误判,以及在转发节点集内选择最优编码节点时需要交换大量的数据包缓存信息会导致较大的端到端时延和网络开销等问题,提出一种适用于多跳无线网络的节点编码感知机会转发路由协议NAOFP(node network coding aware opportunistic forwarding routing protocol)。NAOFP协议通过引入基于侦听概率的附加ID信息添加机制和转发节点集的最优转发节点选择机制,提高了网络吞吐量和编码包的解码成功率,减小了数据包的平均端到端时延。仿真结果表明,与Ex CAR协议相比,NAOFP协议在网络吞吐量、平均端到端时延、编码包的解码成功率等方面的性能均得到了有效的改善。     

延迟容忍传感器网络中基于网络编码的可靠传输

针对延迟容忍移动传感器网络(DTMSN)的随机移动特性和连通的间歇性等问题,提出了基于网络编码的可靠传输机制。基于DTMSN传感器节点的移动性和网络编码技术,综合考虑了影响DTMSN服务质量保障的各种因素,将数据包以簇为单位映射到网络中,基于误码率机会选择中继转发节点确定最佳传输方案。仿真实验分析结果表明,所提可靠传输机制在误码率、实时性和能效方面与直接传递和泛洪算法相比具有更优越的性能。     

Reference models for a fast packet based network

Two possible architectural reference models are described for a network based on the fast packet switching concept. This is known as an asynchronous time division network. The first model is based on the outband principle, since signalling and data information are transmitted over different logical channels. The second model provides a complete integration at all levels of signalling and data information. It is therefore called the inband model. A comparison of both the inband and outband reference models is also given.     

Software architecture and mobility: A roadmap

Modern software-intensive systems are characterized not only by the movement of data, as has been the case in traditional distributed systems, but also by the movement of users, devices, and code. Developing effective, efficient, and dependable systems in the mobile setting is challenging. Existing architectural principles need to be adapted and novel architectural paradigms devised. In this paper, we give an overview of the intersection of the areas of software architecture and mobility. We consider mobility from two related perspectives: (1) mobile software, which represents the computing functionality designed to migrate across hardware devices at runtime and execute on mobile hardware platforms, and (2) mobile systems, which are computing applications that include mobile software and hardware elements. We study the advances in both these areas, highlight representative existing solutions, and identify several remaining research challenges.     

基于PacketTracer网络案例实验设计和开发

Packet Tracer思科网络学院仿真教学软件是思科网络技术学院中最流行、操作最简单、最接近真实环境的模拟工具。基于Packet Tracer进行了网络实验的设计,教学实践表明,Packet Tracer能够模拟真实的网络交互设备,使得学生可以随时随地的对这些设备进行操作,使得老师的授课更加生动形象,也更利于学生理解。     

Hierarchical architecture for motion and depth estimations based on color cues

Journal of Real-Time Image Processing - This work presents an FPGA implementation of a highly parallel architecture for the motion and disparity estimations of color images. Our system implements...     

分布式网络自动抓包管理系统的设计与实现

讨论了网络抓包原理及WinPcap体系结构,探索了不同于传统客户端被动抓包的方法,对自动抓包进行了研究,提出了由客户端在特定事件触发机制下自动抓包然后推送至服务端的设计思想.在此基础上进行设计与开发实践,给出了一套应用于分布式网络管理环境,包含服务端与客户端的网络自动抓包管理系统的架构及详细设计,并给出了程序实现细节.设计并实现的系统在真实环境中得到成功应用,为网络管理提供了有效的支持.     

A generic architecture for autonomic service and network management

As the Internet evolves into an all-IP communication infrastructure, a key issue to consider is that of creating and managing IP-based services with efficient resource utilization in a scalable, flexible, and automatic way. In this paper, we present the Autonomic Service Architecture (ASA), a uniform framework for automated management of both Internet services and their underlying network resources. ASA ensures the delivery of services according to specific service level agreements (SLAs) between customers and service providers. As an illustrative example, ASA is applied to the management of DiffServ/MPLS networks, where we propose an autonomic bandwidth sharing scheme. With the proposed scheme, the bandwidth allocated for each SLA can be automatically adjusted according to the measured traffic load and under policy control for efficient resource utilization, while SLA compliance over the network is always guaranteed.     

基于小波包和神经网络的瓦斯传感器故障诊断

针对瓦斯传感器常见的故障,提出了基于小波包和神经网络的故障诊断方法.通过对瓦斯传感器的输出信号进行三层小波包分解,得到8个不同频段的分解信号,再对其进行特征提取得到一个八维的特征向量,作为故障样本对三层神经网络进行训练,建立故障类型分类器,对瓦斯传感器故障进行诊断.仿真结果表明:该方法可以准确地诊断出故障类型.     

C3I网络管理体系结构研究

C^3I网络系统是一个结构非常复杂、实时性强、安全可靠性要求严格的高度分布式处理系统,是未来信息化战场的重要基础设施。阐述了现代C^3I系统的结构特点,分析了现有网络管理的体系结构及其在C^3I网络管理中的局限性,指出了基于SNMP协议的传统网络管理体系结构难以适应对C^3I网络管理体系结构的要求,在此基础上,结合分布式对象计算技术,研究在C^3I网络管理系统中应用CORBA技术,建立一种新的网络管理模型,使得C^3I网络管理系统具有分布、实时、可靠、配置灵活等一系列新特性。     

基于软件定义网络技术实现人工智能网络体系架构

软件定义网络(Software Defined Network,SDN)拥有着集中控制、分布式路由和控制平面与转发平面相分离的特点,相比传统的TCP/IP网络,提高了网络的灵活性,并提供了网络可编程的能力。假设控制器能够获取底层网络的特征,并加以分析应用到网络管理中,将会有很好的应用前景。鉴于此,提出了一种基于SDN的人工智能网络架构。该系统使用SDN控制器从底层网络中获取到大量的各类信息,并利用大数据以及人工智能技术加以分析,得到底层网络的特征数据。而这些特征数据会被用来辅助控制器对于下层网络的管理的决策。