| This dissertation presents two novel contributions in the area of mobile network communication. The first is the performance/moving speed relationship of Mobile Internet Protocol(MIP) over Wireless Local Area Network(LAN). In this dissertation, the rapid mobility of MIP over Wireless LAN is emulated on a testbed. The performance of MIP over Wireless LAN at different moving speeds is evaluated. The result shows that current MIP protocol is not suitable for rapid moving environments. This dissertation analyzes the emulation results and depicts the relationship between the performance and the moving speed of the mobile devices. This relationship is used in a novel protocol, which is the second contribution, to improve the performance of MIP over Wireless LAN in rapid moving environments. The second contribution is the Speed Adaptive Mobile IP. In the Speed Adaptive Mobile IP, Mobile Node's registration message is extended by speed extension. With the speed information popularized in the mobile IP network, the behavior of the Speed Adaptive Mobile IP will automatically adapt to the speed of the Mobile Node so that the performance of the Speed Adaptive Mobile IP won't decline dramatically in a rapid moving environment. At the same time, the Speed Adaptive Mobile IP only uses reasonable resources that are enough for seamless handoff. The emulation result shows that the Speed Adaptive MIP greatly improves the performance of MIP over Wireless LAN in rapid-moving environments. |
