| Summary: | 碩士 === 國立中央大學 === 資訊管理研究所 === 98 === In the past, we use wired network to surf Internet, but now we can access network services with mobile devices anytime and anywhere, such as cell phone, notebook or PDA with WiFi. In recent years, tens of thousands of vehicles travel on all corners of the world. Vehicular ad hoc network (VANET) becomes more and more attractive to many telecommunication and wireless communication corporations. With the combination of network and information, intelligent transport systems (ITS) can provide many traffic information services to drivers.
The purpose of this study is to solve traffic congestion on the road and increase utilization of each road by balancing traffic flow. In order to avoid vehicles to be involved to congestive roads, the centralized server will collect traffic information from road side units (RSUs). Moreover, on board units (OBUs) can receive congestive information from RSUs if their remainder path suffers from congestion. When an on board unit receives congestive information, it will remove the congestion road on its map and reselect a new path to destination. However, the notification range of congestion event is determined by the server. In this study, the range of congestion notification is defined as n-hop from congestion road. Only the vehicles which locate in the n-hop congestion notification range will receive the message. Therefore, the parameter n will affect the effectiveness of congestion evacuation, and how to determine the size of n is one of the issues in this study.
For some commuters, they drive with a similar path every day. If the on board unit can record the average time of user spending on each road, it can use this information while reselecting a new path. In the simulation results, the average arrival time of users is much shorter, and the average speed of vehicles becomes faster, too. According to these simulation results, with user’s experience can improve traffic congestion significantly.
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