一种新的WLAN无线Mesh网络测试床的设计与实现

研究了现有的Mesh网络测试床,针对关键节点网络接入点（MAP）的设计,提出“分而治之”的思想,将MAP的功能分解到接入点（AP）和网格点（MP）分别实现,并引入第三大功能子网。该方案在网卡的选择、节点故障处理及后期网络的扩展性等方面很好地弥补了采用单一节点模拟方案的局限性。方案的实现表明改进后的测试床具有易搭建、易维护和易扩展的特点。     

基于802.11协议的无线Mesh网络搭建与性能测试

建立一个以802.11协议为基础的无线Mesh试验网络在实际应用环境中评价无线Mesh网络的性能[1]。试验网包含Mesh路由器和Mesh客户端两部分。Mesh路由器是基于MIPS构架的嵌入式linux硬件开发板为核心做成;Mesh客户端则是由基于x-86体系的笔记本充当的。通过测试网络中源节点和目的节点的传输速率＂带宽＂来评价Mesh网络的性能,并且通过实时的视频传输来评价网络的稳定性和鲁棒性。     

基于国家试验床的三网融合规模试验和产业化

下一代网络与业务国家试验床是中国信息领域代表性的公共创新平台,也是目前全球最大的网络与业务试验床。该试验床历经＂十五＂、＂十一五＂的建设,目前已形成覆盖20个城市100万用户的规模,支持网络体制创新、新设备试验和新业务示范,成为服务于包括内容提供商、网络运营商和设备提供商等整个宽带网络产业的国家级长效试验示范平台,引领中国网络产业的跨越式发展。文章介绍国家试验床的功能和架构,以及面向三网融合规模试验和产业化等内容。     

实用无线网状网的设计、构建与测试

无线网状网是一种能够广泛应用于多种场合的无线网络结构。论文首先介绍丁无线网状网的特性,描述了在实际应用环境中,对无线网状网节点的设计和构建需求,并以此为依托给出了设计办案然后介绍了SJTU—MESH试验床的部署与碰用情况,以及在试验床上进行的对无线网状网系统的定量测试及其结果,最后给出了结论和对未来工作的展望。     

SDN试验床网络虚拟化切片机制综述

未来网络体系架构和关键技术的研究需要灵活开放的测试验证环境,基于传统分布式的网络架构难以达到动态虚拟化、有效管控和新协议灵活部署的需求。随着软件定义网络（SDN）技术的出现和发展,上述问题找到了有效的解决途径,因此,基于SDN构建网络试验床成为了近年来该领域的主流研究方向之一。其中,基于SDN的网络虚拟化切片技术更是试验床中的核心支撑技术,可以根据不同试验的需求切分物理网络资源,从而提供并行、独立的网络环境。将重点研究基于SDN的试验床中使用的网络虚拟化切片机制,从“流量识别和切片网络标识”、“虚拟节点抽象”和“虚拟链路抽象”这3个关键技术出发,对当前基于SDN试验床中的典型网络虚拟化切片机制进行介绍与分析,并总结了该领域未来可行的研究方向。     

基于无线Mesh网络技术构建无线城市

无线Mesh网络(WMN)可以和多种无线网络系统,如无线局域网(WLAN)、无线城域网(WMAN)等相结合,改善无线网络的性能,提高网络的覆盖范围.以WMN网络技术在IEEE 802系列标准中的发展为基础,提出了一种无线城市的覆盖方案,最底层网络覆盖采用WiFi+wireless Mesh技术,WiMAX网络与WiFi...     

基于Mesh技术构建城市无线宽带混合网络的思考

文章结合上海无线Mesh组网应用的试验,介绍实验室和外场环境的技术测试情况,详细分析了无线Mesh网络在4.9GHz频段的传播特性、移动速度与吞吐率的关系,提出了对基于Mesh技术构建城市无线宽带混合网络的组网模式及其应用领域的一些思考。     

无线Mesh网络服务质量保障技术综述

首先简要地介绍了无线Mesh网络的基本概况以及无线Mesh网络QoS保障技术的必要性和重要意义。然后,详细地讨论了无线Mesh网络的物理层、MAC层和路由层QoS保障技术以及跨层QoS设计技术的研究现状。最后,指出今后的研究难点与研究方向。     

无线Mesh网络集中式信道分配算法设计

以集中式无线Mesh网络(WMN)为基础,分析和研究了传统多信道分配算法,并在此基础上提出了以节点优先级和分组为特点的多接口多信道分配算法(Channel Assignment based on Rank of Node and Link group,CAR-NL),该算法结合节点分级和链路负载预期评估机制,通过节点链路分组按级分配信道。通过仿真实验表明,该算法能有效提高无线Mesh网络多业务流并发执行时系统整体吞吐量,并实现较低的丢包率。     

无线Mesh网络技术在油田单位中的应用分析

通过油田数字化建设实现远程视频监控、闯入预警、功图法计量、电子巡井、数据采集等功能,建立起一套现代化的管理决策系统。如何保障数据从复杂的现场地理环境中传输到各个井站管理平台是信息网络建设的难点。通过对油区地理位置和各种网络传输技术分析研究,通过现场试验应用,选择无线Mesh网络组网技术为实现方案,并就无线Mesh网络技术在油田应用情况做以阐述。     

一种无线Mesh实验网络的构建

无线Mesh网络作为一种新型组网方式,已成为当前网络技术研究的热点。本文提出一种Mesh网络研究的实验测试平台,给出了整体的实现方案,并就实现细节做了详细的介绍。本方案主要采用当前流行的WLAN技术,结合PC机的灵活性和Linux操作系统的丰富功能和稳定性,实现Mesh网络的结构。经测试验证,网络性能稳定,功能良好。     

无线协作Mesh网

异构无线网络的融合是当前无线网络的发展趋势。针对融合过程中遇到的诸如传输模式选择、负载平衡、路由和切换之类的问题,文章提出了一种新的网络融合架构：无线协作Mesh网。该架构基于无线Mesh网的网络结构,并通过协作通信进一步优化其结构、提升其性能。该架构能充分发挥Mesh技术高频谱效率、动态自组织的优点和协作通信高分集增益、高能量效率的优点,可为无线网络融合提供一种有效的解决方案。     

基于OPNET的海上无线Mesh网络路由协议的研究与仿真

针对船舶移动和海洋特殊环境本文采用了无线Mesh自组网来实现海上通信.本文首先介绍了Mesh网络的关键技术和OPNET网络仿真平台,然后给出了海上无线Mesh网络架构,最后通过OPNET平台对OLSR协议、DSR协议和AODV协议的时延、投递率和吞吐量进行了仿真分析,得出AODV协议的性能优于其他两种协议,更适合应用于海上通信.     

Wireless Cooperative Mesh Network:A New Architecture for Network Convergence

The convergence of heterogeneous wireless networks is a trend in the evolution of wireless networks.A new architecture for network convergence,named Wireless Cooperative Mesh Network,is proposed to solve such emerging problems in convergence as transmission mode selection,load balancing,routing and handover.The new architecture is based on the structure of Wireless Mesh Networks (WMNs),and cooperative communication is also employed to further optimize its structure and upgrade its performance.It can thus obtain advantages of both the Mesh technology (high spectrum efficiency and dynamic self-organization) and cooperative communication (high diversity gain and high energy efficiency).The new architecture serves as an efficient solution for wireless network convergence.     

Experiences from the design, deployment, and usage of the UCSB MeshNet testbed

In this article we report on our effort and experience in designing, deploying, and using our 30-node wireless mesh testbed, the University of California at Santa Barbara (UCSB) MeshNet. Compared to simulation, the construction and utilization of a wireless mesh testbed poses many new challenges. We discuss the challenges with distributed testbed management, nonintrusive and distributed monitoring, and node status visualization. These are vital components in a sustainable wireless mesh testbed, but at the same time nontrivial to design and. realize. As a case study, we present the UCSB MeshNet architecture, including its management, monitoring, and visualization systems. We share our lessons learned from this effort and believe that they are valuable to other researchers who develop experimental wireless mesh networks.     

Wireless Mesh Technology and Network

Wireless Mesh Network (WMN) has been actively researched and developed as a new network technology to support broadband high- speed multimedia services . This paper discusses WMN technology and applications , and introduces the basic technologies , typical applications and current development of the WMN. With the future development of wireless distribution technology and network, wireless Mesh technology and network will become the key networking technology and architecture of wireless mobile communications , and will be widely used in various wireless networks with more important roles .     

无线Mesh网中实时数据业务仿真与分析

无线Mesh网络是一种架构式多跳无线网络,具有结构灵活、快速部署、自组织和自愈合等优点,具有广泛的应用前景。通过采用ns-2仿真软件对基于IEEE 802.11 MAC协议和AODV路由协议的无线Mesh网中实时数据业务的数据传输进行建模与仿真,分析了Mesh网络中数据流经过的传输跳数与吞吐率的关系,以及MAC层RTS/CTS、重传次数以及MAC层和路由层相互作用对无线Mesh网中实时数据业务性能的影响,指出了提高无线Mesh网中实时数据业务性能的所需要的改进方向。     

QuRiNet: A wide-area wireless mesh testbed for research and experimental evaluations

Research in wireless mesh networks has been growing in recent years. Many testbeds have been created to study networking protocols in wireless mesh networks. In this work, we describe QuRiNet, an outdoor wide-area wireless mesh network deployed in a natural reserve. QuRiNet comprises of over 30 wireless nodes, spread over 2000 acres of wilderness. QuRiNet provides the backbone infrastructure for transporting ecological and environmental data from the natural reserve to the on-campus laboratories. Mesh nodes in QuRiNet are powered by solar energy, and comprise of multiple radios per node. Physical link distances in QuRiNet range from hundreds to thousands of meters. A parallel goal of deploying QuRiNet is to create a novel platform for advanced research in wireless mesh networks. In this report, we share our experiences in the deployment and maintenance of QuRiNet in its unique setting. We also describe various research efforts that have been leveraging the QuRiNet testbed. Several interesting measurement results are reported, along with the impact of various network configurations and technological variations on the functionality of the testbed. QuRiNet has been used for a variety of experimental studies including: channel assignment, network monitoring, and mobility studies. Current and future study plans include experimental evaluations of various security and reliability research.     

Reliability Strategies for Data Transmission in Wireless Mesh Network

Wireless Mesh Network (WMN) is a new-type wireless network. Its core idea is that any of its wireless equipment can act as both an Access Point (AP) and a router. Each node in the network can send and receive signals as well as directly communicate with one or several peer nodes. One important issue to be considered in wireless Mesh networks is how to secure reliable data transmission in multi-hop links. To solve the problem, the 3GPP system architecture proposes two functionalities: ARQ and HARQ. This paper presents two HARQ schemes, namely hop-by-hop and edge-to-edge, and three ARQ schemes: hop-by-hop, edge-to-edge, and last-hop. Moreover, it proposes three solutions for WMNs from the perspective of protocol stock design: layered cooperative mechanism, relay ARQ mechanism and multi-hop mechanism.