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可避免数据包乱序的网络层软切换方法及其性能分析
  • 摘要

    随着异构无线网络的融合和全IP网络的推广,网络层软切换方法不断演进,用以提高垂直切换的性能.但是,现有的软切换方法在下行垂直切换过程中会造成严重的数据包乱序.为此,文中在讨论下行垂直切换时数据包乱序的原因之后,提出了一种新型网络层软切换方法--SHORDER.该方法根据移动终端与其家乡代理之间的交互信令对终端所收数据包进行适当的缓存,能有效避免移动终端因下行垂直切换接收到乱序的数据包.该方法所具有的网络层独立性使其能与各种传输层协议及其改进协议相兼容.此外,文中还从理论上定量地分析了所提方法对TCP应用的切换时延、有效吞吐量及拥塞窗口的影响,并与现有的典型网络层软切换方法进行了比较.通过比较,得出了SHORDER机制的适用条件,并基于此,进一步改进了SHORDER方法.最后,在原型系统上的实验显示出了所提机制便于部署的优点以及该机制在其适用条件下的良好性能.此外,实验结果还显示出与数值分析结果的一致性.

  • 作者

    舒童  刘敏  李忠诚  SHU Tong  LIU Min  LI Zhong-Cheng 

  • 作者单位

    中国科学院计算技术研究所网络技术研究中心,北京,100190;中国科学院研究生院信息科学与工程学院,北京,100190/中国科学院计算技术研究所网络技术研究中心,北京,100190

  • 刊期

    2010年1期 ISTIC EI PKU

  • 关键词

    下行软切换  数据包乱序  TCP吞吐量  快速重传  异构无线网络  soft downward vertical handoffs  packet reordering  TCP goodput  fast retransmission  heterogeneous wireless networks 

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