共查询到19条相似文献,搜索用时 80 毫秒
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本文通过研究IEEE802.11协议无线网在移动的、线性的地铁运行环境下快速切换的问题,从漫游切换的原理和过程出发,分析并提出了采用持续漫游、提前切换的机制和FIT AP网络构架的方法实现无缝漫游切换并减少切换时间的网络建设优化方案。 相似文献
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在现有无线通信系统向第四代无线通信系统(4G)演进的过程中存在着很多关键的难题,例如网络结构的提升,信令协议的增强,要提供端对端的服务质量(QoS)保证,全球范围内的无线漫游以及灵活多样的服务提供。本文介绍了几种4G可能的无线网络架构,使之能支持跨多重网络的全球漫游,随后讨论了4G网络中的QoS保证,最后提出一种基于QoS的智能调节机制。 相似文献
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众所周知,手机在漫游状态下通话需加收漫游费用。然而,在地区与地区之间的边界附近的区域,由于基站信号交叉覆盖,用户的手机可能在未漫游的情况下而经由外地区的基站信号构成链路进行通信,从而产生了漫游话单。若要消除边界漫游的情况,就需要进行网络优化.一般要从无线网络优化与计费优化两方面着手。 相似文献
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在多个接入点的无线网络中,运用漫游和桥接功能可以将无线网络的空间加以拓展,使办公环境更加方便、快捷。本文介绍了实现这两个功能的过程并在此基础上对网络的服务效果进行了简单测试。 相似文献
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介绍了无线医护需求产生的背景,指出无线病房是实现移动医疗的基础,并介绍了基于此背景下的锐捷网络关于移动医护方面的解决方案,该解决方案为移动医护提供了零漫游无线网络覆盖,解决了在一个病区内信号中断问题,有效地降低了信号干扰,实现了零漫游。 相似文献
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In the future, wireless and mobile users will have increased demands for seamless roaming across different types of wireless
networks, quality of service guarantees and support of different types of services. This awareness has led to research activities
directed towards inter-system and global roaming and can be noticed in the numerous products like multimode handsets, inter-working
gateways and some ongoing standards and research work on signaling protocols for inter-system roaming. This article proposes
a global mobility management framework. The framework is like an overlay network comprising of Inter-System Interface Control Units IICU to support inter-network communication and control for Location Management. The protocols and functions of this framework will be distributed and exist partly within the wireless networks and partly
within the core-network. A hierarchy introduced among the IICUs will accommodate for the varying mobility coverage required
by the mobile user. The IICU may be configured to perform various functions depending on its placement in the hierarchy of the framework. This approach
aims to optimize across call set up delays, signaling traffic, database processing, handoff facilitation for seamless roaming
and QoS mapping and negotiations as the user moves across different wireless networks. It avoids centralized database dependency
with its associated single-point bottleneck and failures. We restrict our analysis of the framework to a 2-network and a 3-network
roaming scenario. The presentation has been further restricted to cost and delay analysis of the location update and call
delivery procedures. We have taken into account the signalling requirements when the mobile user roams across networks with
and without an active call.
Nirmala Shenoy is Associate Professor at the Information Technology department at RIT. She has several years of teaching and research experience
while working in Germany, Singapore and Australia before she moved to USA. She is an avid researcher in the wireless networks
area and has technically led several wireless network projects to success. She holds a Ph.D. in computer science from the
University of Bremen, Germany, Masters in Applied Electronics and Bachelors in Electronics and Telecommunications Engineering
both from Madras University in India. Professor Shenoy is interested in research in the area mobility management and modeling
for wireless networks, Quality of service in wireless networks and the Internet. 相似文献
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根据地铁环境下无线通信的特殊性,对无线接入进行了重新设计。研究并继衷了传统移动IP的思想,并对其进行了一定的修改,将移动代理大部分职能与无线接入点进行分离,实现了移动节点与无线接入点之间快速正确切换的功能,在不同的网段中移动时实现了漫游功能,并且实现了有、无线网络的连接畅通。最后描述了系统的测试结果以及存在的不足。 相似文献
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无线通信网络的移动性管理 总被引:1,自引:0,他引:1
未来无线通信网络的两个最重要的研究问题就是宽带和无缝漫游,而移动性管理是实现网络间无缝漫游的关键难题之一。本对移动性管理涉及的各个方面进行了简要的概述,首先介绍了移动性管理的分类和它对协议层次的影响,接着介绍了移动性管理的一般性框架和主要的协议特点,最后介绍了一些关键的研究问题和研究热点。 相似文献
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无线广域网(WWAN)与无线局域网(WLAN)都是近期发展比较成熟的无线网络,将它们很好的结合,是下一代网络(NGN)发展趋势与主题。使用虚拟用户识别模块(SIM)卡认证是在SIM/用户服务识别模块(USIM)模式基础上提出的一种可行性设想,利用蓝牙技术组成无线个人通信网,快速找到虚拟SIM,不需要通过繁复的设置认证,通过把通信任务和进程从应用处理中分离出来,加速了针对无缝漫游新应用的创新。 相似文献
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Daojing He Chun Chen Sammy Chan Jiajun Bu 《International Journal of Communication Systems》2013,26(8):1028-1037
When one considers the broad range of wirelessly connected mobile devices used today, it is clear that integrating such network‐enabled devices into secure roaming over wireless networks is of essential importance. Over the years, many authentication protocols have been suggested to address this issue. Among these protocols, the recently proposed privacy‐preserving universal authentication protocol, Priauth, exceeds the security and efficiency of other authentication techniques. This paper studies the existing roaming authentication protocols and shows that they are not strong enough to provide secure roaming services in three aspects. Further, using Priauth as an example, we propose efficient remedies that fix the weaknesses. The experimental results show that the proposed approaches are feasible in practice. Copyright © 2012 John Wiley & Sons, Ltd. 相似文献
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在网络融合的趋势下,通过电信网络为WLAN网络提供终端认证将是未来WLAN业务认证的主要方式。为高效、安全地实现网间漫游状态下WLAN的鉴权认证,本研究分析了在网间漫游状态下WLAN的鉴权需求,讨论了鉴权模式、流程和存在的问题,提出了基于EAP SIM/AKA协议的、非中转方式的WLAN漫游认证方案,并进行了验证。实验结果证明该非中转认证方案可以满足终端在漫游状态下实现EAP SIM/AKA认证的需要,同时增强了系统的安全性,降低了投资成本,实现了实时计费。 相似文献
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移动电话的漫游信息是移动业务运营商拥有的一个巨大信息库,深挖移动电话漫游信息库并针对性做好运营,是提升"智能管道"能力的重要体现。利用信令监测系统做好信令数据信息挖掘的应用工作有很多,本文仅就如何对漫游信息做好深入挖掘以及做好运营提出了实用处理方法,为提升运营商服务水平作出了贡献。 相似文献
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近年来GSM国际漫游业务迅速发展,移动运营商普遍关心国外GSM用户的漫游选网登记问题,本文从GSM规范中根据用户需要漫游选网登记原则和手机自动选择 方式下的漫游选网登记原则两方面进行研究分析,并在实际运行网络中进行了对比测试,结合作者对移运运营的实践经验,得出在实际和运营中获取国漫游用户进入本网络的具体措施,提供给运营商参考。 相似文献