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近年来,用户对专用网络的需求越来越大,IP -VPN技术发展很快,但其服务质量是一个非常重要的因素。首先对VPN中的QoS问题及其研究现状进行了综述,具体分析了InterServ和DiffServ两种模型的QoS实现框架研究,其次对基于MPLS的VPN进行了分析。 相似文献
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新一代网络协议IPv6协议解决了IPv4在使用过程中出现的IP地址不足的问题,同时提供了IPv4所不支持的QoS机制.针对目前研究较为广泛的DiffServ机制,建立了在极端恶劣的环境--煤矿井下的网络视频监控在DiffServ机制下的模型,并通过仿真以及对仿真结果的分析,指出了该模型在不同的队列排队机制下对网络性能及QoS的影响,为后续对DiffServ机制的研究提出了几点建议. 相似文献
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EV-DO系统是专门针对移动多媒体应用进行优化的无线传输技术.本文概述了EV-DO Rev A系统的QoS机制及端到端QoD体系架构,分析了EV-DO系统为不同用户、不同业务提供差异化服务的QoS需求,探讨了EV-DO系统支持差异化服务的端到端QoS技术及应用,并指出了进一步改进分组调度算法和速率控制技术以优化无线资源管理,从而满足用户公平性、不同用户和业务的QoS要求. 相似文献
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采用软件无线电技术和模块化设计思路,构造新一代的无线通信系统,是无线通信发展的趋势。介绍了软件通信体系结构(SCA)的无线通信系统,描述了基于SCA无线通信系统的安全体系结构,详细分析了加密子系统、信息安全子系统和设备安全子系统。这样定义的安全体系结构保证了基于SCA无线通信系统实现不同的安全模式,提供不同的安全级别。 相似文献
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系统地介绍无线以太网技术,着重讨论了无线以太网的发展概况、链路层与物理层、MAC帧结构、网元设备和网络拓扑结构、网络性能与管理、无线以太网的标准等。讲座(4)主要介绍无线以太网的网络拓扑结构。 相似文献
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无线网络优化平台的规划与建设 总被引:2,自引:1,他引:1
本文主要介绍无线网络优化平台的规划和建设方案,提出基于集中管理思路的无线网优平台架构,并对其中的无线参数管理系统的建设情况做介绍。 相似文献
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无线USB技术及其应用分析 总被引:1,自引:0,他引:1
对最近刚刚通过标准的无线USB技术厦其应用作了简要分析。从无线USB技术的标准化进程入手,介绍了无线USB的体系结构、技术特点以及针对无线平台的增强技术,分析了无线USB技术的三种应用领域,最后对无线USB的应用推广作了一些展望。 相似文献
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Intelligent Handoff for Mobile Wireless Internet 总被引:6,自引:0,他引:6
Jon Chiung-Shien Wu Chieh-Wen Cheng Nen-Fu Huang Gin-Kou Ma 《Mobile Networks and Applications》2001,6(1):67-79
This paper presents an intelligent mobility management scheme for Mobile Wireless InterNet – MWIN. MWIN is a wireless service networks wherein its core network consisting of Internet routers and its access network can be built from any Internet-capable radio network. Two major standards are currently available for MWIN, i.e., the mobile IP and wireless LAN. Mobile IP solves address mobility problem with the Internet protocol while wireless LAN provides a wireless Internet access in the local area. However, both schemes solve problems independently at different layers, thereby some additional problems occur, e.g., delayed handoff, packet loss, and inefficient routing. This paper identifies these new problems and performs analyses and some real measurements on the handoff within MWIN. Then, a new handoff architecture that extends the features of both mobile IP and wireless LAN handoff mechanism was proposed. This new architecture consists of mobile IP extensions and a modified wireless LAN handoff algorithm. The effect of this enhancement provides a linkage between different layers for preventing packet loss and reducing handoff latency. Finally, some optimization issues regarding network planning and routing are addressed. 相似文献
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WiMedia, Wi-Fi, WiMax, Wi-Mobile, WiRAN, the Wi-family is getting bigger; so does the network architecture. It is encouraging
to see the fast development of the new IEEE wireless technologies promising the ultimate Internet service deployment on wireless
and mobile infrastructures since they would offer larger bandwidth at cheaper price compared to the telecommunication wireless
radio resource. However it is disquieting to see that the TCP/IP protocol stack which is supposed to be the heart of the Internet
services deployment is not evolving as fast as the wireless technologies do. Here we come up with the hard question which
is the network performance of the TCP/IP architecture over wireless networks. It is probably too early to decide to replace
TCP/IP by another protocol stack for wireless network support, but it is important to not ignore the problem and analyse the
main drawbacks of TCP/IP in wireless networks and think about a new architecture of network communication over the wireless
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This paper provides a brief survey of what we name here the Wi-family wireless technologies, and emphasizes on new network
architecture to optimize the TCP/IP behaviour worsen by the wireless characteristics. 相似文献
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基于J2ME的无线Internet应用方案 总被引:9,自引:0,他引:9
分析了J2ME(Java2 micro edition)技术的体系结构以及它在手机等无线通信设备上的应用,探讨了结合J2ME与WAP等技术Internet应用的无线模型,并对今后无线Internet应用的发展趋势作出了预计。 相似文献