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...     

无线Mesh网络安全研究

无线Mesh网络（Wireless Mesh Networks,WMN）是下一代网络中的新型技术,和传统网络不同,它可以不依赖任何固定的设施,主机可以相互依赖保持网络连接。WISP可以利用它提供快速、简单、低廉的网络部署,然而存在一个主要的挑战就是易于遭受攻击。文中介绍了无线Mesh网络的体系机构以及特点,分析并研究其存在的安全性威胁以及现有的关键安全解决机制。     

城市无线Mesh网络规划

本文对城市无线Mesh网络的规划进行了研究。围绕无线城市,无限服务的理念,借鉴国际各无线城市先行者的成功经验,在深入调研、科学分析、严格论证的基础上,对无线城市无线Mesh网络的规划原则、网络部署等方面进行深入的研究和分析,将如何构建一个健全、高效的无线Mesh网络为研究重点。     

无线Mesh网络的安全问题研究

无线Mesh网络在近年来获得了飞速发展,因其速率高、自组织等特点受到普遍推崇,被认为是下一代的无线网络首选模式,有着非常广阔的应用前景。但由于其无线多跳等特质,也使得无线Mesh网络具有一定的安全隐患,影响家庭和企事业单位及公共场所对其的应用。本文主要针对无线Mesh网络的安全问题进行研究,在简单介绍无线Mesh网络原理及特点的基础上,阐述了无线Mesh网络面临的安全威胁,介绍了当前比较流行的攻击手段,并指出了相应的防御办法,以期能够为无线Mesh网络的安全防范和发展提供一定思路。     

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网络路由协议研究

首先讨论了无线Mesh网络（WMN）路由协议的研究背景及其特点,阐述了WMN路由协议研究现状,介绍了其相关商业应用情况,并对其特性进行了简要分析。分别对多判据路由、QOS路由、分级路由、多信道路由、跨层路由等路由协议的设计原则和思路进行了详细讨论。最后。结合一些研究热点问题,展望了WMN路由协议的研发前景。     

智能家居中无线Mesh网络信道分配算法的研究

将无线Mesh网络技术应用于智能家居组网中对实现信息化、网络化智能家居系统具有重要意义。针对现有无线Mesh网络信道分配算法无法满足智能家居系统中网络连接稳定性、灵活性等需求的问题,提出了一种基于信道状态的动态信道分配算法。该算法利用控制信道交互的信息,通过Hello信息的交换、信道协商、数据传输三个主要步骤实现动态分配信道,有效提高了无线Mesh网络的稳定性。     

无线Mesh网络中网络编码的文件共享模型

网络编码的基本思想是网络节点不仅参与数据转发,还参与数据处理,可大幅提高网络性能。传统文件传输系统存在文件分发时间的"瓶颈"问题,为此,提出一种在无线Mesh网络中网络编码的简化文件共享模型,采用理论分析和实验仿真的方法,研究节点间的4种合作机制。结果表明,在总分发时间上,基于网络编码转发机制比无网络编码的转发机制平均减少11.67%,显著地降低了文件传输系统的分发时间,从而提高了网络的吞吐量。     

无线Mesh网络路由判据的研究

无线网状网(wMN)相关技术的研究非常活跃,路由判据的设计是提高其性能的关键.文章研究了几种现有的路由判据,包括HOP、ETX、ETT、WCETT、MIC、WCETT-LB,并对其进行了详细的分析;提出了对路由判据的改进思路,指出多准则路由判据、跨层路由判据是以后的研究方向.     

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。     

Incentive Mechanism Design for Selfish Hybrid Wireless Relay Networks

Non-cooperative behaviors in communication networks can significantly adversely affect the entire network. Recently, researchers have begun to study such non-cooperative communication systems within a game theory framework and strive to engineer the system to prevent performance degradation under non-cooperative behaviors. The WWAN/WLAN two-hop-relay system described in [1] integrates two types of wireless technologies to improve wireless access throughput and coverage. The relay nodes in the two-hop-relay system can be wireless relay routers deployed by wireless service providers, or dual-mode users who voluntarily relay traffic for other users. However, it is reasonable to assume that all dual-mode terminals are selfish and are not willing to relay for other users without an incentive. In this paper, we will use the basic concepts of game theory, especially the concept of the Nash Equilibrium, to design our scheduling algorithms. Several scheduling algorithms, including the maximum rate C/I scheduler, the proportional fair scheduler, and the round robin scheduler, are examined to understand performance while operating under the assumption that all users are selfish. Under the C/I scheduler or the proportional fair scheduler, Nash Equilibriums exist at the operating points where no user will relay for other users—an undesirable situation. Under the round robin scheduler, selfish users are indifferent on relaying voluntarily or not relaying. Therefore, we are inspired to design a novel incentive scheduler. By applying the proposed incentive scheduler, all selfish users relay cooperatively at the Nash Equilibrium. Hung-yu Wei received a B.S. degree in electrical engineering from National Taiwan University in 1999. He received an M.S. and a Ph.D. degree in electrical engineering from Columbia University in 2001 and 2005 respectively. He is currently an assistant professor at Department of Electrical Engineering, National Taiwan University. His research interests are in cross-layer design issues of wireless mesh networks, and integration of mobile ad hoc networks with cellular networks. Richard D. Gitlin has more than 35 years of experience and leadership in the communications and networking fields. He is currently President of Innovatia Networks, a startup wireless company. Previously he was Vice President, Technology of NEC Laboratories America, Inc. and before assuming this position he was Visiting Professor of Electrical Engineering at Columbia University. After receiving his doctorate in electrical engineering from Columbia, he was with Lucent Technologies for more than thirty-two years, where he held several senior executive positions. He was the Chief Technical Officer and Vice President of R&D, of the Data Networking Systems Business Unit, and Senior Vice President for Communication Sciences Research at Bell Labs, Lucent Technologies where he managed and led research in wireless systems, broadband and optical networking, multimedia communications, and access technologies. He is the co-recipient of three prize paper awards including the 1995 IEEE Communications Society's Steven O. Rice Award, the 1994 IEEE Communications Society's Frederick Ellersick Award, and the 1982 Bell System Technical Journal Award. He is a co-winner of the 2005 Thomas Alva Edison patent award. Dr. Gitlin is the co-author of the text Data Communications Principles, more than 95 technical papers, numerous conference papers and keynote presentations. He holds 43 patents in the area of data communications, digital signal processing, wireless systems, and broadband networking. He is a member of the National Academy of Engineering, a Fellow of the IEEE, and is also an AT&T Bell Laboratories Fellow. Since May 2002, he has served on the Board of Directors of PCTEL [NASDAQ; PCTI], a wireless networking company.     

SLCRM：无线网格网络中一种基于主观逻辑的跨层信誉机制

Wireless Mesh Networks (WMNs) are vulnerable to various security threats because of their special infrastructure and communication mode, wherein insider attacks are the most challenging issue. To address this problem and protect innocent users from malicious attacks, it is important to encourage cooperation and deter malicious behaviors. Reputation systems constitute a major category of techniques used for managing trust in distributed networks, and they are effective in characterizing and quantifying a node狆s behavior for WMNs. However, conventional layered reputation mechanisms ignore several key factors of reputation in other layers; therefore, they cannot provide optimal performance and accurate malicious node identification and isolation for WMNs. In this paper, we propose a novel dynamic reputation mechanism, SLCRM, which couples reputation systems with a cross-layer design and node-security-rating classification techniques to dynamically detect and restrict insider attacks. Simulation results sho that in terms of network throughput, packet delivery ratio, malicious nodes' identification, and success rates, SL-CRM implements security protection against insider attacks in a more dynamic, effective, and efficient manner than the subjective logic and uncertainty-based reputation model and the familiarity-based reputation model.     

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QoS保障技术综述

首先,简要回顾了无线Mesh网络的基本概况,分析了在无线Mesh网络中提供QoS保障的必要性和重要意义。然后,系统地介绍了无线Mesh网络的物理层、MAC层和路由层QoS保障技术以及跨层QoS设计技术的国内外研究现状,对其进行了细致而科学的分类。最后,给出了它们的研究难点和研究方向。     

基于ECC的无线Mesh网络身份认证方案

文章对于无线Mesh网络环境,提出了一种基于ECC的双向身份认证方案。方案采用公钥证书、Hash函数等技术,不仅提供了安全的身份认证和密钥协商功能,而且具有运算量小、传输参数少的优点,较容易在无线Mesh网络中实现。     

无线Mesh网络的新型建模方法研究

对无线Mesh网络准确建模是开展Mesh网络各项研究的基础,基于传统802.11协议模型来分析Mesh网络性能会导致较大的偏差。提出了一种适用于无线Mesh网络的新型模型用以计算网络饱和状态下性能参数的理论值,如丢包率、节点发送概率等,性能分析和仿真结果表明,该方法更能精确地评估无线Mesh网性能。同时在此基础上给出了路由判据ETX理论值的计算方法,该方法可用来预测ETX值而无需实测,从而有效的减少了测量误差和带宽消耗。     

无线Mesh网络QoS路由度量研究

无线Mesh网络的研究非常活跃,针对网络路由选择已经提出了一些路由选择度量。本文对各种路由度量及优缺点进行了详细的分析,并在此基础上,给出了一种新的路由度量方式并展望无线Mesh网络QoS路由度量选择的发展方向。     

Survivable Routing Protocol for Green Wireless Mesh Networks Based on Energy Efficiency

This paper proposes a new Energyefficient Survivable Routing Protocol（ESRP）based on solar energy and wind mixed for power supply in green wireless mesh networks（WMNs）.The ESRP combines hop penalty strategy and flooding delaying strategy to improve the performances of traditional routing protocol.This paper uses QualNet to simulate and verify the performances of proposed ESRP.Compared with the traditional routing protocol,the simulation results show that the energy utilization of ESRP is more efficient by 13%.At the same time,ESRP is more load-balanced to postpone the appearance of the first energy depletion node and reduce the number of energy depletion nodes,and thus it effectively improves network survivability.     

无线Mesh网络跨层路由技术研究

无线Mesh网络(WMN:wireless mesh networks)作为一种新型的无线网络,成为近几年研究的热点。由于无线信道不稳定等特性,如何设计WMN的路由协议成为决定其性能的关键因素之一。近几年来的研究表明,通过跨层设计的方式综合其他层的重要参数来实现路由选择,能够很好地解决这一难题。介绍了几种先进的跨层路由设计方案,总结了现有的跨层路由协议的优缺点,并对如何设计并实现跨层路由协议进行了分析和总结。     

无线网状网技术与应用

无线网状网(WMNs)由网状路由器节点和客户机节点组成,其中的网状路由器节点组成了无线网状网的网络骨干,其移动性很小。他们一起为无线网状网和其他常规无线网络的客户机节点提供网络的无线接入。WMNs技术结合了中心式控制的蜂窝网与分布式控制的无线自组织网的优点,可有效克服这两种技术的缺陷并显著提高无线网络的性能,已经成为下一代无线通信网络的研究热点之一。WMNs可为无线个域网、局域网、校园网、城域网的一系列应用提供高速无线宽带接入服务。虽然目前WMNs技术发展很快,但其协议栈各层仍存在许多有待研究的课题。首先简要介绍了无线网状网的结构与特点;随后重点分析了其主要的几个应用领域;最后探讨了WMNs各协议层的研究现状与关键技术,并分析了该技术存在的问题及未来的研究方向。