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张瑶 《网络安全技术与应用》2014,(8):240-240
移动互联网时代移动数据流量激烈增长,wiFi成为了重要的移动互联网接入业务,是日益构成移动互联网的重要组成部分。运营商要把移动数据网和WIFi视为一个网络整体,促进无线未来的发展。 相似文献
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目前,无线宽带接入网因为其可移动性、使用灵活、维护方便、易于扩展和良好的性价比,取得了巨大发展.未来宽带接入的最主要的应用是多媒体通信,本文从简要介绍无线接入技术的概念、应用和发展涉及到无线接入技术的未来发展.进一步就未来无线接入技术的特点、关键技术以及性能满足要求作出总结和分析,并就未来宽带无线接入系统可能面临的一些问题及解决办法,最后简要介绍一种宽带IP无线移动接入技术. 相似文献
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无线互联网(WI)的范畴 无线互联网(WI,WirelessInternet)主要是指以IP数据通信为目的的无线数据网络(WDN,Wire—less Data Network),用于将个人终端、移动终端接入到Internet,或用于联接孤立的网络。根据覆盖范围的不同,WDN可以分为无线广域网(WWAN,Wireless Wide AreaNetwork)、无线局域网(WLAN, 相似文献
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随着互联网的发展和移动终端的普及,高校的教育和科研等活动越来越依赖于网络。高校师生对能够随时随地接入互联网获取资源的无线网络需求也更加迫切。在高校校园内部署无线局域网能够很好地满足这一需求。 相似文献
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于5月18日至20日在北京召开的国际互联网研讨暨展示会期间,诺基亚推出了基干无线应用协议(WAP)的无线接入解决方案,据透露,首先基于WAP的移动媒体电话诺基亚7110将延迟到今年下半年国内面市。 相似文献
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Issues in emerging 4G wireless networks 总被引:2,自引:0,他引:2
Researchers and vendors are expressing a growing interest in 4G wireless networks that support global roaming across multiple wireless and mobile networks. With this feature, users will have access to different services, increased coverage, the convenience of a single device, one bill with a reduced total access cost, and more reliable wireless access even with the failure or loss of one or more networks. 4G networks will also feature IP interoperability for seamless mobile Internet access and bit rates of 50 Mbps or more. Because deployment of 4G wireless technology is not expected until 2006 or even later, developers will hopefully have time to resolve issues involving multiple heterogeneous networks 相似文献
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方柯 《电脑编程技巧与维护》2014,(10):108-109
互联网技术和智能手机技术快速发展,无线网络成为新一代网络组建的趋势,它可以摆脱传统网线的束缚,在无线网络的覆盖范围内便捷快速地访问互联网信息。学生作为智能手机和互联网的热衷者,几乎人手一台智能手机,随着教育信息化的不断发展,学校无线网络建设顺应信息社会的发展,给师生提供更人性化的教学环境,可以随时随地在校园的各个角落上网。 相似文献
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无线数字城市建设是指利用3G通信技术和WiFi,WiMAX等无线宽带接入技术,为政府、公众提供无所不在的高速无线网络链接。并在基于无线网络、地理信息系统、综合业务管理平台、智能化生活平台等基础设施上,为政府、城市居民和企业提供丰富多彩的移动互联网业务。 相似文献
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随着宽带网络迅速普及,越来越多的人希望用手提电脑、PDA、手机等设备移动接入网络.而无线宽带网络逐渐在公共接入.公共安全.公共服务等方面发挥巨大潜力,引发了无线网络建设的热潮;本文在分析制约无线网络发展的主要问题基础上.对规模化无线网络建设给出一些具体方案和建议. 相似文献
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何宇 《网络安全技术与应用》2014,(12):235-236
目前社区服务信息化平台多为依托于个人电脑和桌面互联网,但这种平台对于用户的使用和体验都有着诸多条件的限制。而随着宽带无线接入技术和移动终端技术的迅速发展,社区服务信息化的建设模式具备了从单一的桌面互联网转变至结合移动互联网的跨平台模式的可能性。在探寻面向主导型社区居民的真实需求及社区中特殊人群的需求差异的同时,我们需要依托移动终端为社区服务信息化提供更加定制化的信息设计,以帮助实现社区内部、社区与社会之间更好的交流互动;并将碎片化的内容整合为对公众更加有效的信息服务! 相似文献
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《Computer Communications》2007,30(11-12):2497-2509
Multi-privileged group communications containing multiple data streams have been studied in the traditional wired network environment and the Internet. With the rapid development of mobile and wireless networks and in particular mobile ad-hoc networks (MANETs), the traditional Internet has been integrated with mobile and wireless networks to form the mobile Internet. The multi-privileged group communications can be applied to the mobile Internet. Group users can subscribe to different data streams according to their interest and have multiple access privileges with the support of multi-privileged group communications. Security is relatively easy to be guaranteed in traditional groups where all group members have the same privilege. On the other hand, security has been a challenging issue and is very difficult to handle in multi-privileged groups. In this paper, we first introduce some existing rekeying schemes for secure multi-privileged group communications and analyze their advantages and disadvantages. Then, we propose an efficient group key management scheme called ID-based Hierarchical Key Graph Scheme (IDHKGS) for secure multi-privileged group communications. The proposed scheme employs a key graph, on which each node is assigned a unique ID according to access relations between nodes. When a user joins/leaves the group or changes its access privileges, other users in the group can deduce the new keys using one-way function by themselves according to the ID of joining/leaving/changing node on the graph, and thus the proposed scheme can greatly reduce the rekeying overhead. 相似文献
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余顺争 《计算机工程与应用》2004,40(14):166-171,186
在移动网络中,移动用户对Internet的访问,具有与通常的外部Internet网络不同的特点。移动用户发出的对信息内容的请求(例如询问前方交通情况和路线),以及无线Internet信息提供商主动向移动用户发出的信息(例如移动用户附近的商品信息广告),与移动用户的位置、移动状态(方向、速度)和个人情况(userprofile)等有关。因此,要建立恰当的无线Internet流量模型和实现QoS(业务质量)控制,需要考虑用户的移动特性和在不同移动状态下访问Internet的概率分布。该文将建立一个新的定量分析模型,用半马尔可夫过程和一般的状态空间来描述移动用户的行为;并基于该移动模型,建立相应的移动用户对信息内容的访问模型、描述移动用户请求的到达过程;进而得到无线Internet业务质量参数的估计,即无线Internet对移动用户请求的平均响应时间、对无线侧和有线侧传输带宽的需求等;利用这些结果,可以实现无线资源的动态分配和允入控制。该文还将分析无线代理网关的性能、缓存容量需求,并给出改善平均响应时间的可行方案。最后用计算机模拟对提出的理论分析进行验证。 相似文献
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《Computer Networks》2008,52(16):3062-3074
In recent years, many different kinds of wireless access networks have been deployed and become inseparable parts of the Internet. But TCP, the most widely used transport protocol of the Internet, was designed for stationery hosts. It faces severe challenges when user moves around in these networks and handoff occurs frequently. In this paper, we investigate the potential benefits of bringing explicit cooperation between TCP server and mobile host.For this purpose, TCP HandOff (TCP-HO), a practical end-to-end mechanism, is designed for improving TCP performance in heterogeneous mobile environments. TCP-HO assumes that a mobile host is able to detect the completion of handoff immediately and has a coarse estimation of new wireless link’s bandwidth. When a mobile host detects handoff completion, it will immediately notify the server through two duplicate ACKs, whose TCP option also carries the bandwidth of new wireless link. After receiving this notification, the server begins to transmit immediately and keeps updating ssthresh according to the bandwidth from mobile host and its new RTT samples. This update will end after four RTT samples or after congestion is detected.TCP-HO has been implemented in FreeBSD 5.4. Experimental results indicate that in heterogeneous mobile environments, TCP-HO can improve TCP performance a lot without adversely affecting cross traffic even when mobile host only has a coarse estimation of new wireless link’s bandwidth. Considering that more and more users are accessing the Internet through heterogeneous wireless networks and mobile host could have a coarse estimation of wireless link’s bandwidth, it should be worthwhile to change both server and mobile host for improving TCP performance. 相似文献