| Summary: | 碩士 === 國立交通大學 === 資訊工程系 === 87 === In recent years, due to technology development of wireless communication, wireless networks are integrated with the Internet. Such an integrated environment is called a mobile computing environment, which has become a trend. In mobile computing environments, network nodes are mobile. Each host would move everywhere and still retain connectivity to Internet. Mobile computing environment provides users a lot of new services, but host mobility incurs problems, such as location tracking. Thus, Mobile IP is designed to support host mobility.
Handoff procedure is necessary for the mobile computing environments. When a mobile host moves from one subnetwork to another subnetwork, handoff procedure will start. The mobile host will be disconnected from the system for a period during which the host cannot receive data packets from the system. Since the system cannot be aware of this disconnection, data packets sent to the mobile host will be lost. This will degrade the network transmission efficiency.
Based on Route Optimization in Mobile IP, we integrate the network and data link layers for mobile networking, and propose a mechanism to support smooth handoff. Using this method, packets loss during handoff procedure will be reduced considerably. By our experiment results, this method is shown to be promising.
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