WLAN无线分布扩容解决方案

随着国内WLAN网络建设不断升温、用户量增加,早期建设的站点的扩容需求不断涌现。WLAN无线分布扩容涉及到施工变更、AP布点变更或增加,与站点现场WLAN网络部署的具体实施密切相关,是WLAN网络扩容最重要的组成部分。本文提出六种WLAN无线分布扩容解决方案,旨在确保网络质量的基础上,节省扩容建设成本,提高企业的运营效益,充分发挥网络的容量和性能。     

3G与WLAN融合中认证协议的分析与改进

通过分析3G和WLAN融合方案中在安全认证方面的不足,指出认证过程中WLAN的AP不能得到验证的问题,提出了"认证平衡"接入方案,并分析证明了该方案能使通信的各方都能够得到有效的认证,有效地消除了融合过程中AP不能得到认证的弊端.     

WLAN组网及无线网络优化研究

针对改善WiFi 网络质量、提升用户体验的需求,在分析网络频率特点、干扰来源的基础上,系统提出网络无线侧优化的方法。探讨从传统的以胖AP为主要组成部分的自治型WLAN网络向以瘦AP+AC为架构的会聚型WLAN网络演变的组网方式。     

无线Mesh关键技术与实证——清华大学无线实证网络系列报道(四)

部署传统无线网络时,人们总是苦恼于难以寻找到合适的有线接入点,尤其在空旷、缺乏铜线/光纤等有线资源的室外环境中,问题更加明显。无线Mesh网络的出现在很大程度上解决了这一问题:传统WLAN中,每一个AP都需要通过有线接入点连接到有线局域网;而无线Mesh网络由一组呈网状分布的无线AP组成,只需要设置部分AP通过有线接入点连接到宽带骨干网就足够了,至于AP与AP之间则采用点对点方式通过无线中继链路互联,这大大减少了对有线资源的需求,极大便利了无线网络的部署。无线Mesh技术优点不仅于此,它在覆盖区域、移动漫游等方面与传统WLAN…     

高校无线WLAN覆盖方式的选择

无线网络具有无须布线,用户接入方便,可以自由移动等优点。同时随着大量支持Wi-Fi手持设备的普及,WLAN技术正面临前所未有的发展机遇。目前无线覆盖一般采用胖AP部署方式、胖AP加天馈部署方式、瘦AP部署方式、瘦AP加天馈部署方式。     

基于WLAN密集高流量场景的用户感知提升

为了解决密集型WLAN网络中出现的各类问题,通过分析高校密集型空间,不断探索尝试新思路与新方法,提出了RTS/CTS隐藏节点规避、AP功率个性化设置、AP特殊场景覆盖等优化方法,对高校密集型场所用户感知问题起到了明显改善作用.     

无线覆盖方式及性能比较

现状目前,大多数WLAN都在使用2.4GHz频率波段,穿透性和衍射能力很差,现代建筑质量提高,对室内形成较强的屏蔽,造成AP蜂窝大小被限制在一定的范围内,使得WLAN覆盖面积有限。     

Motorola Solutions推出创新802.11n墙挂式接入点

本刊讯6月3日,Motorola Solutions宣布推出AP6511 802.11n墙挂式接入点（AP）,旨在将802.11n无线局域网（WLAN）服务快速扩展至酒店、医院等拥有多个区域的设施。借助现有的架构,您只需几分钟即可将AP 6511安装到客房和建筑内,     

基于站的IEEE 802．11b／g无线局域网快速切换方案

由于实时应用对传输时延和抖动相对敏感,为减小WLAN切换过程对实时应用的影响,研究了WLAN切换过程的3个方面：触发切换,AP选择和快速切换算法．充分考虑到方案的可部署性和可扩展性,提出了一个以终端站为中心的快速切换方案．设计实现了基于动态阈值的切换触发机制、基于探寻时延的AP选择机制和信道区分选择结合动态缓存的快速切换算法．该方案完全在站上实现,不需要AP的配合或者对协议进行修改,因而具有良好的鲁棒性和可部署性．通过在实际的hotspot WLAN环境下测试和分析,该快速切换方案有效地减小了切换时延,同时使用户获得的实时应用网络性能有所增强．     

基于eNSP的WLAN实验设计与实现

介绍了WLAN的工作原理,基于e NSP设计WLAN实验方案,搭建实验环境,通过对AC和AP进行配置,实现了网络的互联互通。利用Wireshark协议分析软件捕获报文,分析了无线接入点控制和配置协议工作原理,验证了无线终端二层和三层漫游的工作过程。通过实验使学生从理论和实践两方面更好地理解WLAN技术的工作原理,增强了实践动手能力和综合应用能力。     

卡思卡特城堡

It is worthy of noting that, whilst Crookston Castle witnessed the earlier and happier portion of Mary's variegated life,     

不同的吃喝玩乐

一、吃和喝吃苹果 eat an apple, 吃药 take medicine,吃糖 have some sweets,吃饭 have one's meals,吃馆子 dine out,吃惊 be surprised/     

漏洞百出的教育

Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help?     

只要努力,不要后悔

There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love.     

浅谈移民问题

Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject.     

Sister Carrie, an Adherent of Desires

Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities.     

Improvement of one-cycle controller by use of proportional integral differential controller

1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec…     

库克斯顿城堡

城堡, 是欧洲典型的建筑之一, 每个城堡都有一个美丽的传说或是一段历史。从本期开始, 我们将推出“城堡之旅”, 带各位读者去浏览、观赏欧洲各地的城堡, 开始一段文化与历史的旅途!     

The Reader Response Approach to Teaching of English Literature

During interview with English majors, it was found that a majority of students expressed disappointment with their experience of English literature classes. Students' dislike of learning English literature appears to be the major problem of teaching English literature in China. Reader response approach is a good way to solve this problem. In this paper, I explain the rationale behind the reader response approach, such as its origin, definition, features, assumptions, and strategies. Then I illustrate how reader response approach works as a teaching strategy by presenting several teaching models. At last I evaluate its usefuiness for teachers and present the advantages of reader response approach in Chinese context.