| Summary: | 碩士 === 國立臺北大學 === 通訊工程研究所 === 96 === The goal of the network mobility (NEMO) management is to effectively reduce the complexity of handoff procedure and keep the mobile devices connecting to the Internet. When users are going to leave the old subnet and enter the new subnet, the handoff procedure is executed on the mobile devices and it may break off the real time service, such as VoIP or mobile TV, due to the mobility of mobile devices. Since the vehicle is moving so fast that it may cause the handoff and packet loss problems. Both of the problems will lower down the throughput of the network. To overcome these problems, we propose a novel NEMO protocol for vehicular ad hoc network (VANET). In freeway, since every car is moving in a fixed direction with high moving speed, the car adopting our protocol can acquire IP address from the VANET through vehicle to vehicle communications. The vehicle can rely on the assistance of the front vehicle to execute the pre-handoff procedure or it may acquire its new IP address through multi-hop relays from the car on the lanes of the same or opposite direction and thus reduces the handoff delay and maintain the connectivity to the Internet. Simulation results have shown that the proposed scheme is able to reduce both handoff delay and packet loss rate.
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