无线局域网的突破：无线网状网

随着无线局域网标准802.11的日渐成熟,无线局域网已不再局限于存货管理、零售价格管理、数据收集以及工业自动控制等企业应用,而是越来越多地被企业员工用来收发电子邮件、浏览网页或是登录公司数据库等,以实现移动办公。但是,传统的无线局域网由于在带宽、安全性等方面存在缺陷,对于日益提升的这些应用需求显得力不从心,因此,一种新的无线局域网技术——无线网状网(WMN)应运而生。无线网状网特点无线网状网是基于IEEE802.1x标准的无线通信技术,目前支持802.11a、802.11b和802.11g标准,随着标准的完善,今后会支持802.11i和802.11e(支持Q…     

IEEE802.11s路由协议漏洞与攻击

IEEE802.11s是IEEE关于无线Mesh网络的规范。802.11s虽然沿用了IEEE802.11i的安全规范,但是对于路由协议的安全并没有做过多的定义,由此产生了一定的安全隐患。文章分析了IEEE802.11s标准(草案)中的路由协议的漏洞,并针对IEEE802.11s中使用的混合无线网状网协议(HybridWirelessMeshProtocol,HWMP)设计了两种攻击方式,从而破坏无线网状网络的可用性。通过在自行设计的路由器平台上实现无线攻击,并分析攻击对网络造成的影响来验证安全漏洞的存在性和可利用性。     

IEEE802．11标准及扩展标准

IEEE802.11是第一代无线局域网(WLAN)标准之一,1997年6月被IEEE(美国电气和电子工程师学会)委员会认可。IEEE802.11无线局域网标准的制定是无线网络技术发展的一个里程碑。该标准定义了物理层和媒体访问控制(MAC)协议的规范,允许无线局域网及无线设备制造商在一定范围内建立互操作网络设备。它使PC在对等的基础上互联(或用集线器和Internet网关相联)。802.11b和802.11a是其中的两个扩展标准。     

无线局域网 IEEE802.11 高性能局域网统一信息系统

无线局域网标准 IEEE802.11是第一代无线局域网标准之一。 1990年 IEEE802标准化委员会成立 802.11无线局域网 (WLAN)标准工作组。 802.11无线局域网标准工作组任务为研究 1Mbit/s和 2Mbit/s数据速率、工作在 2.4GHz开放频段的无线设备和网络发展的全球标准,并于 1997年 6月公布了该标准。该标准定义物理层和媒体访问控制 (MAC)规范,允许无线局域网及无线设备制造商建立互操作网络设备。 　　IEEE 802.11标准中物理层定义了数据传输的信号特征和调制。在物理层中,定义了两种 RF传输方法和一种红外线传输方法。在该标准中, RF传输采用扩频方法,即采用了跳频扩频 (FHSS)和直接序列扩频 (DSSS)两种方法,工作在 2.4000GHz～ 2.4835GHz频段。     

无线局域网中的OFDM技术

802.11是IEEE最初制定的一个无线局域网(WLAN)标准,主要用于解决办公室局域网和校园网中用户与用户终端的无线接入,业务主要限于数据存取,速率最高只能达到2Mbit/s。由于它在速率和传输距离上都不能满足人们的需要,因此,IEEE小组又相继推出了新的标准。目前802.11b实际上已成为无线局域网     

IEEE802．11g协议关键技术及性能分析

一、IEEE 802.11g协议背景 自从1997年IEEE802.11标准制定以来,基于IEEE802.11的无线局域网标准发展迅速,已成为无线局域网的主要标准,广泛应用于办公、家庭、公共场所、学校和热点地区(如飞机场、码头仓库、超市)。IEEE802.11规定无线局域网工作在ISM频段,这一频段为免许可证波段。IEEE802.11是由大量的局域网以及计算机专家审定通过的标准,定义了一致的媒体接入层(MAC)和多样的物理层(PHY)。     

WLAN与3G之争

目前，IEEE802.11系列的WLAN已成为市场发展的主流，在IEEE802.11标准体系中又分为IEEE802.11b（又称Wi-Fi）、IEEE802.11a、IEEE802.11g，就其应用的广泛性，IEEE802.11b独占鳌头。IEEE802.11b工作于ISM（工业、科技、医疗）的2.4GHz频带，采用补码键控CCK调制方式，支持11Mb/s的传输码率，采用的标准安全协议WEP（WiredEquivalent Privacy）。在中国，中国电信于2002年5月推出了“天翼通”无线宽带局域网，而中国网通于2001年就开始实行“无限伴侣”计划，在上海APEC会议期间，网通的无线局域网已经发挥了巨大的作…     

802.11无线局域网与公用网连接探讨

作为一种有广阔前景的技术,IEEE802.11无线局域网正得到越来越多人的关注.随着配置802.11无线局域网企业的增多,需要将802.11技术与公用网进行结合.由于早期制定协议时并没有考虑这一因素,因此802.11标准在漫游、加密、鉴权等方面还存在一些不完备之处.本文介绍了目前国际上正在进行的这方面的研究成果,同时提出了将企业中基于802.11的无线局域网与公用网进行结合的解决方案.     

美国网件发布Super G 108M无线局域网方案

近日,美国网件(NETGEAR)发布了全球首款兼容IEEE802.11g/b无线局域网标准,可提供高达108 Mbit/s数据通信带宽的Super G系列产品。首先推出的两款产品是WGT624 108M     

无线局域网在军事通信中的应用前景

无线局域网WLAN以其方便、快捷、廉价等诸多优势，这几年在民用领域取得了长足的发展和巨大的成功。同时无线局域网的诸多特性也符合现代战争对军事通信提出的许多新要求。因此将无线局域网用于军事通信领域，这也是一个值得研究的课题。无线局域网是计算机网络与无线通信技术相结合的产物，是以射频RF或者红外IR作为传输媒介的计算机局域网。IEEE 802标准委员会先后发布了WLAN标准——IEEE 802.11和IEEE 802.11b。随后又于2001年11月制定了传输速率更高的IEEE 802.11a标准，目前正在制定IEEE 802.11g标准。一个WLAN大致包括…     

下一代WLAN技术标准802.11ac/ad

基于IEEE802.11n标准的WLAN能够支持高达600 Mbit/s的传输速率,但在支持无线高清视频传输等高吞吐量无线数据业务时仍然会遇到瓶颈。面对这一挑战I,EEE已启动下一代WLAN技术标准802.11ac和802.11ad的制定工作,数据吞吐量将达到几个Gbit/s,能够更好地满足快速增长的市场需求。     

A novel performance analysis model for an IEEE 802.11 wireless LAN

This letter presents a novel analytic model that accurately evaluates the performance of a single-hop IEEE 802.11 wireless LAN (WLAN). By using a closed queuing network, we model an IEEE 802.11 WLAN system that consists of a fixed number of stations and derive the saturated throughput of the IEEE 802.11 distributed coordination function (DCF). The ns-2 simulation results show that our new analysis model is very accurate in evaluating the performance of the IEEE 802.11 DCF.     

Packet telephony support for the IEEE 802.11 wireless LAN

Packet telephony is one of the most promising applications in the Internet. In this paper, we propose a modified MAC protocol supporting voice traffic over the IEEE 802.11 WLAN. The proposed scheme adapts the power-saved mode of the IEEE 802.11 specifications in such a way that it approaches the TDM access mode carrying voice traffic, and is compatible with the IEEE 802.11 standard. Simulation results show that the proposed scheme does not degrade the performance of the IEEE 802.11 WLAN using the DCF and also provides good voice quality     

Mesh WLAN networks: concept and system design

In recent years WLAN technology has become the common wireless access technology for mobile computing. Additional to infrastructure access to WLAN networks, peer-to-peer and mesh networking are currently gaining in interest. Mesh networking techniques using WLAN are being standardized in IEEE 802.11s. This article describes use cases, the main technical issues, and a set of potential solutions for mesh network development. Furthermore, an overview of the standardization activities in IEEE 802.11s is presented. The key technical aspects of mesh networks identified are topology creation, routing, medium access control, security, quality of service, and power efficiency.     

IEEE802.11n标准及其关键技术

首先简要介绍了WLAN的各个技术标准;其次重点分析了IEEE将要推出的最新技术标准IEEE802.11n的基本原理和物理层关键技术;最后指出IEEE802.11n标准是未来无线局域网接入技术的发展趋势.     

A survey of QoS enhancements for IEEE 802.11 wireless LAN

Quality‐of‐service (QoS) is a key problem of today's IP networks. Many frameworks (IntServ, DiffServ, MPLS etc.) have been proposed to provide service differentiation in the Internet. At the same time, the Internet is becoming more and more heterogeneous due to the recent explosion of wireless networks. In wireless environments, bandwidth is scarce and channel conditions are time‐varying and sometimes highly lossy. Many previous research works show that what works well in a wired network cannot be directly applied in the wireless environment. Although IEEE 802.11 wireless LAN (WLAN) is the most widely used IEEE 802.11 wireless LAN (WLAN) standard today, it cannot provide QoS support for the increasing number of multimedia applications. Thus, a large number of 802.11 QoS enhancement schemes have been proposed, each one focusing on a particular mode. This paper summarizes all these schemes and presents a survey of current research activities. First, we analyze the QoS limitations of IEEE 802.11 wireless MAC layers. Then, different QoS enhancement techniques proposed for 802.11 WLAN are described and classified along with their advantages/drawbacks. Finally, the upcoming IEEE 802.11e QoS enhancement standard is introduced and studied in detail. Copyright © 2004 John Wiley & Sons, Ltd.     

On the capabilities of IEEE 802.11e for multimedia communications over heterogeneous 802.11/802.11e WLANs

Multimedia communications over WLAN is widely acknowledged as one of the key, emerging applications for wireless LANs. As with any multi-service network, there is the need to provision the WLANs with the QoS mechanisms capable of guaranteeing the requirements of various services. The upcoming IEEE 802.11e (EDCA) standard is a proposal defining the mechanisms for wireless LANs aiming to provide QoS support to time-sensitive applications such as voice and video communications. Due to the fact that the IEEE 802.11e interface cards will take over the WLAN market, replacing the use of legacy IEEE 802.11 interface cards in most WLAN applications, an important number of networking scenarios will consist of a hybrid configuration comprising legacy IEEE 802.11-based stations and IEEE 802.11e-based stations. For this reason, in this paper we carry out a performance analysis on the effectiveness of the IEEE 802.11e (EDCA) upcoming standard when supporting different services, such as, voice, video, best-effort, background and in the presence of traffic generated by legacy 802.11 (DCF) based stations.     

IEEE 802.11s wireless mesh networks: Framework and challenges

Wireless mesh networking based on 802.11 wireless local area network (WLAN) has been actively explored for a few years. To improve the performance of WLAN mesh networks, a few new communication protocols have been developed in recent years. However, these solutions are usually proprietary and prevent WLAN mesh networks from interworking with each other. Thus, a standard becomes indispensable for WLAN mesh networks. To meet this need, an IEEE 802.11 task group, i.e., 802.11s, is specifying a standard for WLAN mesh networks. Although several standard drafts have been released by 802.11s, many issues still remain to be resolved. In order to understand what performance can be expected from the existing framework of 802.11s standard and what functionalities shall be added to 802.11s standard to improve performance, a detailed study on the existing 802.11s standard is given in this paper. The existing framework of 802.11s standard is first presented, followed by pointing out the challenging research issues that still exist in the current 802.11 standard. The purpose of this paper is to motivate other researchers to develop new scalable protocols for 802.11 wireless mesh networks.     

无线局域网关键技术与发展综述

基于IEEE802.11标准全面介绍了无线局域网，包括其概念、发展历史、特点、构件及体系结构、发展前景，详细讲述了IEEE802.11协议的帧格式以及实现IEEE802.11WLAN所需的几项关键技术。     

IEEE 802.11g性能分析及应用

全面介绍IEEE802.11g标准的无线局域网,详细讲述IEEE802.11g草案标准的概念、产生背景、特点、构件及其体系结构和发展前景,探讨实现IEEE802.11gWLAN所需的关键技术及其双频多模应用方式,同时分析IEEE802.11g标准的网络性能。