| Summary: | 碩士 === 國立成功大學 === 資訊工程學系碩博士班 === 100 === This thesis proposes a contention-based protocol on symbol level network coding and many-to-many broadcast in order to improve the performance of network coding and transmission efficiency. Utilizing VANET broadcast characteristic and network coding technique to enhance network traffic and reduce transmission time. So far, there have been some studies of network coding and transmission in VANET for analysis and discussion. However, only a handful of works come up with effective ways to improve it. There is immediate demand for VANET information, but environmental factors usually cause data loss and error in the transmission duration. In this work, a novel network protocol with three mechanisms can promote the efficiency of network coding and transmission. By applying Intra-Vehicle Symbol Coding, Proper Forwarder Selector and Inter-Vehicle Contention, a vehicle with high Information Availability can obtain more transmission opportunities. We also consider the integrity of the information received and the characteristic of many-to-many broadcast to adapt VANET. The experimental results show that the symbol level coding-based contention forwarding protocol can effectively reduce the information propagation time and enhance the transmission efficiency of VANET.
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