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论述了移动网络中一种新的基于资源管理和预切换概念的QoS体系结构,并对该体系结构的信令接续过程和综合切换模型进行了具体分析。 相似文献
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文章探讨了目前提出的支持移动服务质量的各种方案,并对这些方案的技术特点作了分析与比较,最后讨论了未来移动服务质量的发展趋势和有待研究的课题. 相似文献
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讨论了一种基于移动虚拟节点(VMN)的QoS路由算法—QoSRAVMN,通过移动WAVE在VMN节点间交换网络信息,允许在没有网络拓扑状态信息精确描述的情况下而能快速地发现路由。测试结果表明该算法路由开销低于HDP协议,算法产生的移动WAVE能很好地满足所有源和目的节点路径的QOS要求。 相似文献
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本文首先介绍了QoS的概念模型,然后着重分析了QoS中RSCP(资源预留协议)在移动IP上存在的问题并提出了RSVP与移动IP结合的几种方案,在此基础上介绍了一种在移动IP上提供端到端的QoS机制。 相似文献
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随着移动通信网络的迅速发展,运营商之间的竞争日渐加剧。为了争夺用户,运营商将精力集中在两个方面:一是保持和提高基本业务的服务质量;二是迅速开发和部署移动增值业务。在运营商之间基本业务服务质量相差不多的情况下,迅速地提供丰富、新颖、切合用户需要的移动增值业务就成为运营商生存和发展的必经之路。另一方 相似文献
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移动Ad Hoc网络快速发展的同时,其中的服务质量(QoS)保障问题也日渐突出.设计了一种适用于移动AdHoc网络中多路径路由协议的路径选择和带宽分配算法,选择适合业务传输的路径,并合理分配带宽,实现QoS保障.计算机仿真表明,该算法能够适应移动Ad Hoc网络的动态性、不稳定性,有效地实现QoS保障,改善网络整体性能. 相似文献
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第三代移动通信网的QoS研究 总被引:1,自引:0,他引:1
在深入研究了第三代移动通信网的QoS基础上,提出了目前3G网络的QoS模型。指出了目前3G网络对端到端IP数据流提供透明承载,网络中间节点需要移动网络特定信令才能知道端到端IP流的QoS信息,不利于保证QoS,解决途径是协议栈扁平化。 相似文献
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近些年移动互联网各领域快速发展.在用户方面,移动用户规模快速增长,2016年移动互联网用户总数达到20亿.在终端方面,2016年,全球移动智能终端总共出货量达到15亿台,同比增长约5%.在应用方面,移动应用规模超过1000万款,累计下载规模超过万亿.与此同时,移动应用产业飞速发展,其不断融入新型能力,在传感、识别等方向均有突破,并快速融入到人们日常生活的方方面面.随着移动应用服务的发展,其同样出现了诸多问题,危害用户合法权益,影响产业健康持续发展.重点阐述当前移动应用领域发展现状,解析其特点与存在问题,并探索保障行业健康持续发展的相关措施. 相似文献
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中国移动自主研发了基于用户体验的端到端业务与网络质量评测工具,实现端到端业务质量和性能评测,实现现网真实"用户感知"的可测、可量、可知.基于用户体验的4G端到端业务与网络质量测试工具是面向业务质量和移动互联网网络测试的专业工具,支持Android、iOS操作系统,贴近用户的真实使用场景,实现真正以"用户"为中心的端到端业务质量评测,具备基础通信、网络性能、用户体验、终端性能等测试能力,能够从用户的角度反映实际业务和网络的运行情况、性能质量.该工具多个版本全面支撑了中国移动全网4G试商用城市验收测试、4G全网常态化端到端服务监测,填补了业内自有用户体验评测工具的空白,受到多方好评. 相似文献
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Kun Yang Chris Todd Jie Li Nektarios Georgalas Manooch Azmoodeh 《Wireless Communications and Mobile Computing》2009,9(6):845-858
The practical success of pervasive services running in mobile wireless networks relies largely on its flexibility in providing adaptive and cost‐effective services. Service discovery is an essential mechanism to achieve this goal. As an enhancement to our previous work for service discovery, that is, model‐based service discovery (MBSD), this paper proposes a location‐based service advertisement (SA) algorithm named as MBSD‐sa. MBSD‐sa advocates the importance of service location to the service availability and integrates the service location information together with the service semantic information into service information for advertisement. MBSD‐sa utilizes prediction to estimate the service location so as to reduce the number of SA messages (SAMs). Two complementary types of SA mechanisms (Types 1 and 2) are employed by MBSD‐sa to strike the balance between the SAM overhead and the accuracy of service information. The performance of MBSD‐sa is analyzed both numerically and using simulations. Copyright © 2008 John Wiley & Sons, Ltd. 相似文献
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The increasing variety and complexity of traffic in today's mobile wireless networks means that there are more restrictions placed on a network in order to guarantee the individual requirements of the different traffic types and users. Call admission control (CAC) plays a vital role in achieving this. In this paper, we propose a CAC scheme for multiple service systems where the predicted call usage of each service is used to make the admission decision. Our scheme enables real‐time traffic to be transmitted using shared bandwidth without quality of service (QoS) requirements being exceeded. This ensures that the utilization of the available wireless bandwidth is maximized. Information about the channel usage of each service is used to estimate the capacity of the cell in terms of the number of users that can achieve a certain bit error rate (BER). Priorities assigned to each service are used to allocate the network capacity. An expression for the handoff dropping probability is derived, and the maximum acceptance rate for each service that results in the estimated dropping probability not exceeding its QoS requirements is calculated. Each call is then accepted with equal probability throughout the duration of a control period. Achieved QoS during the previous control period is used to update the new call acceptance rates thus ensuring the dropping probability remains below the specified threshold. Simulations conducted in a wideband CDMA environment with conversational, streaming, interactive and background sources show that the proposed CAC can successfully meet the hard restraint on the dropping probability and guarantee the required BER for multiple services. Copyright © 2005 John Wiley & Sons, Ltd. 相似文献
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Yan Yan Baoxian Zhang Jun Zheng Jian Ma 《Wireless Communications and Mobile Computing》2010,10(7):899-911
In wireless sensor networks (WSNs), a mobile sink can help eliminate the hotspot effect in the vicinity of the sink, which can balance the traffic load in the network and thus improve the network performance. Location‐based routing is an effective routing paradigm for supporting sink mobility in WSNs with mobile sinks (mWSNs). To support efficient location‐based routing, scalable location service must be provided to advertise the location information of mobile sinks in an mWSN. In this paper, we propose a new hierarchical location service for supporting location‐based routing in mWSNs. The proposed location service divides an mWSN into a grid structure and exploits the characteristics of static sensors and mobile sinks in selecting location servers. It can build, maintain, and update the grid‐spaced network structure via a simple hashing function. To reduce the location update cost, a hierarchy structure is built by choosing a subset of location servers in the network to store the location information of mobile sinks. The simulation results show that the proposed location service can significantly reduce the communication overhead caused by sink mobility while maintaining high routing performance, and scales well in terms of network size and sink number. Copyright © 2009 John Wiley & Sons, Ltd. 相似文献
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自2014年世界进入互联网元年开始,互联网浪潮席卷而来.伴随无线网络技术发展与智能手机的不断更新,高校图书馆面对全新变革与机遇.经过多年发展,我国高校图书馆移动服务已由初级阶段步入快速成长阶段,各高校也将移动图书馆视作自身发展的重点.基于此,文章主要针对高校移动图书馆服务平台建设与应用展开了研究. 相似文献