MIPv6切换性能测量和瓶颈分析

Measurement and Analysis for Performance of Mobile IPv6 Handover and its Bottleneck

MIPv6(mobile IPv6)是IETF(Internet Engineering Task Force)工作组提出的IP层移动解决方案.切换是影响MIPv6性能的关键因素.从网络层、传输层和应用层3个层次测量分析MIPv6切换性能,确定协议层次性能相互影响与切换性能瓶颈.根据网络层切换过程,改进其测量移动检测时延的方法,测量MIPv6各个阶段的切换时延并提出减少各阶段时延的建议,分析发现切换性能瓶颈.进一步完成传输层性能测量,分析移动切换对TCP滑动窗口的影响,发现TCP的特性将影响切换过程中上层应用的性能;以FTP应用为例,测量并分析了移动切换对上层应用的影响.相关结论对设计高效的移动切换协议提供了研究基础.

Mobile IPv6 is a protocol proposed by IETF which allows mobile nodes to remain reachable while moving around in the IPv6 Internet. Handover is a key factor that influences Mobile IPv6 performance. Handover latency is too long for real-time application such as VoIP and causes performance degradation of current communication. A network layer handover procedure can be divided into four phases： movement detection, address configuration, home agent registration and correspondent node registration. The impact of different protocol layers and bottleneck of performance in all procedures during handover of MIPv6 is analyzed in this paper based on the experiments of performance measurement. A performance measurement method is deployed to accurately parse delay times in each handover procedure and the modified method of measuring the movement detection delay and the suggestion of reducing the delay in each phase of handover procedure are proposed. By measuring the TCP sliding window and the performance of upper layer applications such as FTP application during handover, the effect of TCP features and performance of upper layer applications in handover procedure are also analyzed. All of these results could provide valuable guideline for improving the performance of mobile handover and designing an effective mobile protocol.