无线宽带多跳网络技术分析与研究

在宽带无线接入领域,各种无线通信技术蓬勃发展的同时,无线mesh网作为一种新型的多跳网络技术,引起了人们广泛的注意。本文通过无线mesh的网络的特点,分析了多跳网络的应用前景,以及影响无线mesh网性能的主要技术因素。     

802．11mesh网的研究及其安全分析

WMN（Wireless Mesh Network）是一种具有动态的无线多跳网状拓扑．自组织、自配置的无线接入网络。网络中各节点自动建立成一个Ad Hoc网络并保持一种网状连接。wMN具有前期投入低、系统容量大．维护简单,可靠性高等许多优点。而802．11mesh网则是802．11和mesh相结合的组网结构．其标准为IEEE802．11s．它使用一组网状的无线路由相连来提供一定区域的无线覆盖。正由于802．11 mesh网的这些特点．也带来了这种网络不同于传统802．11网络的一些新的安全挑战。本文给出了802．11mesh无线网状网的网络架构、关键技术,并重点研究了该网络的安全问题及其解决方案。     

无线Mesh网络组网模式构建

一、引言无线MESH网络(WMN,Wireless Mesh Network,又称无线网状网),是一种新型的宽带无线网络结构,是一种高容量、高速率的分布式网络,它的核心指导思想是让网络中的每个节点都可以发送和接收信号,传统的WLAN一直存在的可伸缩性低和健壮性差等诸多问题由此迎刃而解。无线Mesh技术的出现,代表着无线网络技术的又一大跨越,基于mesh技术的多跳WMN网络正成为目前     

浅谈无线MESH网络技术

无线mesh网络是新近出现的一种无线多跳网状拓扑网络,是一种非常有前途的无线接入网络技术。本文简要介绍了无线mesh网的网络结构、特点、应用,并分析了影响无线mesh网性能的主要技术因素。     

无线Mesh网络路由协议研究

无线Mesh网络WMN（wireless mesh networks）是一种新型的无线网络,它融合了无线局域网（WLAN）和Ad Hoc网络的优势,成为宽带接入的一种有效手段。首先介绍了无线Mesh网的网络结构和特点．并在此基础上讨论了无线Mesh网络对路由协议的要求。无线Mesh网络的路由算法是Mesh领域的研究难点,通过分析比较4种针对WMN的路由协议,总结了现有的路由协议的优缺点,并对今后的研究方向做出了展望。     

802.11 mesh网的安全研究

WMN（wireless Mesh Network）是一种动态的自组织、自配置的网络。网络中的各节点自动建立成一个Adhoc网络并保持一种网状连接。WMN具有前期投入低、系统容量大、维护简单、可靠性高等许多优点。802．11mesh网是一种802．11和mesh相结合的组网结构，它使用一组网状的无线路由器相连来提供一定区域的无线覆盖。由于802．11mesh网的一些特点，这种网络也带来了一些不同于传统802．11网络的一些新的安全挑战。     

无线网格网的跨层安全架构研究

概要介绍了无线网格网(WMN:wireless mesh networks)的发展状况、网络结构及主要优缺点,指出其是构建大规模无线宽带接入网络的一种经济、可行的理想方案;探讨了其安全服务的需求,在重点分析当前链路层和网络层安全协议的基础上,提出基于多信任域的跨层安全架构,来确保无线网格网中灵活高效的安全无线通信。     

无线Mesh网络关键技术

无线Mesh网络(WMN)是一种特殊的Adhoc网络,具有分层的网络结构,其传输骨干网具有多跳、拓扑稳定、无供电约束、业务流量相对汇聚等特性。提高WMN频谱空间复用度是增加网络容量有效的方法,而其设计的关键是有效控制无线链路间的干扰范围。基于多信道的组网技术是WMN关键技术之一,其核心是信道的分配,通过合理的信道分配以获得最大信道利用率。WMN中路由度量的选取需要考虑多跳无线链路间的相互干扰,而通过采用负载均衡路由技术可以均衡网络资源的使用,从而提高网络容量和节点的吞吐率。     

无线网格在WMN中的新型应用

无线网状网(WMN:wireless mesh networks)作为一种新型的无线接入技术,以其大容量、高速率、覆盖范围广等优点成为宽带接入的有效手段。无线网格作为大型计算的一种实现形式,很好地完成了信息互通和资源共享。首先对WMN、无线网格两种技术进行了介绍,然后结合两者不同的应用优势提出了基于无线网格的WMN组网,最后对其可行性进行了论证,同时对其发展前景进行了展望。     

拓展宽带接入的无线Mesh网技术

无线Mesh网(wireless mesh network,WMN)作为一种新的网络结构,正在成为下一代无线接入研究中的一个热点.本文首先介绍了无线Mesh网的一些基本概念,然后讨论了无线Mesh网中的关键技术,并在此基础上分析了其应用前景,最后介绍了当前的主要商用无线Mesh系统和该技术的标准化进展.     

Proportional bandwidth allocation with consideration of delay constraint over IEEE 802.11e-based wireless mesh networks

Wireless mesh networks (WMNs) extend the limited transmission coverage of wireless LANs by enabling users to connect to the Internet via a multi-hop relay service provided by wireless mesh routers. In such networks the quality of experience (QoE) depends on both the user location relative to the Internet gateway and the traffic load. Various channel access or queue management schemes have been proposed for achieving throughput fairness among WMN users. However, delay and bandwidth utilization efficiency of such schemes may be unacceptable for real-time applications. Accordingly, the present study proposes a proportional bandwidth allocation scheme with a delay constraint consideration for enhancing the QoE of users of WMNs based on the IEEE 802.11e standard. An analytical model of the proposed scheme is provided. Moreover, the performance of the proposed scheme is systematically compared with that of existing bandwidth allocation methods. The simulation results show that the proposed scheme outperforms previously proposed schemes in terms of both an improved throughput fairness among the WMN users and a smaller end-to-end transmission delay.     

On Efficient Traffic Distribution for Disaster Area Communication Using Wireless Mesh Networks

In recent time, a great deal of research effort has been directed toward promptly facilitating post-disaster communication by using wireless mesh networks (WMNs). WMN technology has been considered to be effectively exploited for this purpose as it provides multi-hop communication through an access network comprising wireless mesh routers, which are connected to the Internet through gateways (GWs). One of the critical challenges in using WMNs for establishing disaster-recovery networks is the issue of distributing traffic among the users in a balanced manner in order to avoid congestion at the GWs. To overcome this issue, we envision a disaster zone WMN comprising a network management center. First, we thoroughly investigate the problem of traffic load balancing amongst the GWs in our considered disaster zone WMN. Then, we develop traffic load distribution techniques from two perspectives. Our proposal from the first perspective hinges upon a balanced distribution of the bandwidth to be allocated per user. On the other hand, our second perspective considers the dynamic (i.e., varying) bandwidth demands from the disaster zone users that requires a more practical and refined distribution of the available bandwidth by following an intelligent forecasting method. The effectiveness of our proposals is evaluated through computer-based simulations.     

基于无线Mesh网的VoIP性能研究

利用无线Mesh网多跳传输、灵活组网的特点和VoIP通信性能良好且资费低廉的优势,构建基于无线Mesh网的VoIP通信系统,通过应用层性能测试软件IxChariot对系统的整体性能进行了专业测试,分析MOS值、时延、时延抖动及丢包率4种VoIP通信系统关键性能指标,最后测试了分别采用G.711u、G.711a、G.723.1-ACELP、G.723.1-MPMLQ、G.726及G.729这6种常用语音压缩编码算法时VoIP通信系统的性能,研究结果显示无线Mesh网可以很好的支持VoIP通信系统。     

无线Mesh网络在视频监控中的应用

结合网络视频监控的新要求,深入分析了无线Mesh网络的网状拓扑、多跳链路、动态路由协议等关键技术和发展现状,并提出了利用现有产品构建基于无线Mesh技术的视频监控网络应用方案.     

Spiralchord： a space-filling curve based location awareness, cross-layering P2P file sharing system in WMNs

The common characteristics of peer-to-peer (P2P) overlay networks and wireless multi-hop network, such as self-organization, decentralization, hop-by-hop message transmission mode and high degree of dynamicity, lead to research of operating wired P2P applications on wireless multi-hop networks. Wireless mesh network (WMN) as a relative static multi-hop wireless network which is extended from Ad-Hoc networks, has become one of the key technologies for providing increased network coverage of Internet infrastructures. This paper investigates the problem of enabling P2P file sharing in WMNs. A special chord algorithm-spiralchord is proposed to address the major problem in wireless file sharing system-how to efficiently find resources currently available. Spiralchord put forward an identifier (ID) assignment technique based on spiral space-filling curve to integrate location-awareness with cross-layering. Location awareness aims at alleviating the mismatch of physical network topology and overlay network topology, and requires close-by IDs in logical ring of neighboring peers, while cross-layering aims at speeding up resource lookup operations, requires faraway IDs of neighboring peers. Spiralchord uses spiral curve to assign peers’ IDs which meet the contradictory requirements of location-awareness and cross-layering. The simulation results show spiralchord is effective in reducing message overhead, and increasing lookup performance with respect to basic chord.     

无线Mesh网络与IEEE802系列标准

无线宽带接入系统发展迅速,但带宽容量低、覆盖范围小等缺点限制了它的进一步发展。作为“最后一公里”宽带无线接入非常重要的技术之一。无线Mesh网络（WMN）可以和多种无线网络系统,如无线局域网（WLAN）、无线个域网（WPAN）以及无线城域网（WMAN）等相结合,改善无线网络的性能,提高网络的覆盖范围。随着无线Mesh网络技术的厂泛应用,IEEE802的相关标准组正在致力于推动WMN技术的发展,制订相关的技术标准。目前,WMN标准已经出现在IEEE802．11s、80215、802．16、802．20中。     

A new fast polling algorithm in wireless mesh network for narrowband Internet of Things

Telecommunication Systems - We present a new fast polling algorithm (FPA) in a wireless mesh network (WMN) for Narrowband Internet of Things systems using multi-hop WMNs. We focus on wireless...     

Capacity and QoS for a Scalable Ring-Based Wireless Mesh Network

The wireless mesh network (WMN) is an economical solution to support ubiquitous broadband services. This paper investigates the tradeoffs among quality-of-service (QoS), capacity, and coverage in a scalable multichannel ring-based WMN. We suggest a simple frequency planning in the proposed ring-based WMN to improve the capacity with QoS support, and to make the system more scalable in terms of coverage. We develop a physical (PHY)/medium access control (MAC) cross-layer analytical model to evaluate the delay, jitter, and throughput of the proposed WMN, by taking account of the carrier sense multiple-access (CSMA) MAC protocol, and the impact of hop distance on transmission rate in the physical layer. Furthermore, the mixed-integer nonlinear programming optimization approach is applied to determine the optimal number of rings and the associated ring widths, aiming at maximizing the capacity and coverage of a mesh cell subject to the delay requirement     

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...