| Summary: | 碩士 === 國立成功大學 === 交通管理學系碩博士班 === 98 === Intelligent Transportation Systems (ITS) focus on increasing the efficiency of existing surface transportation systems through the use of advanced computers, electronics, and communication technologies. Two types of communications are important in ITS, namely Vehicle-Infrastructure Integration (VII) and Inter-Vehicle Communication (IVC). VII focuses on the communication between vehicles and infrastructures and IVC focuses on the communication between vehicles and vehicles. The wireless communication network for vehicles in traffic networks based on VII and IVC is named Vehicular Ad-Hoc Network (VANET).
This research proposes an integrated simulation framework for simulating VANET. The integrated framework establishes a feedback interface between two simulation components, traffic simulation and communication simulation. The traffic simulation is performed through DynaTAIWAN, a mesocopic simulation-assignment model, and the communication is simulated through Network Simulation version 2 (NS2). This framework is constructed to study the traffic impact of VANET. Within the framework, the information from network simulation is feedback to traffic simulation. When the traffic simulator receives the information from network simulator, the IVC vehicles can change route based on received information.
Offline and online experiments are conducted to illustrate the proposed framework and possible benefits from VANET. The offline experiments are conducted to study possible impact of density and speed of vehicular flows and communication range. The results show that packet delivery rate decreases with respect to traffic density.
The on-line experiments focus on the impact of information feedback interval on the performance of VANET. The results from the online experiments show that information feedback interval should be designed carefully in apply VANET in a traffic network.
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