| Summary: | 碩士 === 國立臺中教育大學 === 資訊工程學系 === 103 === In Vehicular Ad-hoc Networks (VANET), vehicles move on the roads at high speed. Mobile nodes have high mobility, so the network topology changes frequently. Therefore, the connection is unreliable. The development of application and service in VANET, makes the frequency of packet transmission increase. Furthermore, because of the limitation of bandwidth in wireless networks, the probability of collision increases.
In this thesis, we focus on packet transmission mechanism in VANET. We propose Adaptive Delayed Transmission for Opportunistic Network Coding (ADT). Network coding is one of method increasing the efficiency of packet transmission. The concept of network coding is that the relay node combines several packets into one packet. With network coding, the information of the packet increases. However, the relay node wants to find coding opportunity in the queue. The node needs to find packets to combine together. In order to increasing coding opportunity, the relay node adaptively waits for a while. Finally, we implement the proposed mechanism by NS2 network simulator. The simulation results show that ADT can improve packet arrival rate and throughput.
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