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• W2747676435 abstract "Current Intelligent Transportation System (ITS) relies on decades-old technologies such as loop detectors and road-side message boards. With the help of new communication technologies such as DSRC/WAVE for Vehicular Adhoc Networks (VANET), and the proliferation of powerful cellular mobile devices such as smartphones with 3G/4G data connectivity, new traffic monitoring and controlling applications could be developed. This dissertation focuses on the design and analysis of key properties of VANETs and traffic control and monitoring applications enabled by aforementioned new technologies.As simulation is the predominant tool used in research related to VANET, this dissertation first presents the key requirements for accurate simulations that arise from the various applications supported by VANETs. We then review the current state-of the-art of VANET simulation tools. Based on our analysis of the traditional simulation approaches, we present VGSim (‘V’ehicular-based networking ‘G’rid ‘SIM’ulator), an integrated networking and microscopic vehicular mobility simulation platform. VGSim provides full-fledged wireless network simulation with accurate traffic mobility model. These two components are tightly integrated and interact dynamically. We discuss the flexibility of VGSim in adopting different mobility models and also present simulation results that empirically validate a modified mobility model that accurately captures the mobility of highway traffic. We discuss how VANET applications can be easily modeled in VGSim and demonstrate that using two important applications, namely, Accident Alert and Variable Speed Limit.Another property of VANET enabled vehicles is that they can form wireless ad hoc mesh networks (VMeshes) that are mobile, constantly changing both in size and the geographic area they cover. We next focus on how the VMeshes can be used to capture and retain certain transient information on the road within a given region of interest for a certain period of time, without any infrastructure support. This dissertation studies this “storage capability” of VANET for highway and city traffic. Particularly, we study different properties (average life time and deletion time) of the VANET storage for both 1-D highway traffic and 2-D city wide traffic. Through theoretical and detailed simulation analysis driven by the realistic mobility trace observed in San Francisco Yellow Cabs, we find that the same system parameters (e.g., transmission range and the size of the region of interest) can have different impact on VANET storage properties under different mobility patterns. Particularly, the size of the region of interest where the information needs to be stored has a large impact on the lifetime of the storage for the 2-D city-wide traffic. On the other hand, the transmission range of wireless communication has large impact on the success rate of deleting the information and the mean time to delete the information. Furthermore, the simulation analysis using SF Cab trace shows that even with low density of cabs, the average life time of VANET storage can be in order of minutes, demonstrating that it is possible to build realistic applications using VANET storage.Given the on-going discussion of climate change and the ever increasing demand for fossil fuel, the ability to reduce vehicular carbon footprint is of great importance for both environmental and economical reasons. This dissertation next presents a Carbon Footprint/Fuel Consumption Aware Variable Speed Limit (FC-VSL) traffic control scheme that targets to minimize average vehicular fuel consumption on freeways, under live traffic conditions. We first formulate the problem of minimizing fuel consumption for a single vehicle under certain traffic condition as an optimal control problem. By solving the problem, we obtain the optimal vehicular trajectory that results in minimum fuel consumption. Then we design the FC-VSL scheme based on the optimal trajectory. We present the performance of the FC-VSL scheme through detailed simulation analysis. The results show that the FC-VSL scheme can significantly reduce the average fuel consumption, out-perform standard variable speed limit schemes that are designed to smooth traffic flow without considering fuel consumption.Aside from aggregated carbon emission aware traffic control, vehicular fuel consumption could also be reduced by enabling drivers change their driving behavior to be more Eco-friendly. This dissertation continues to demonstrate Eco-Driving Coach, a mobile-social application suite that is designed to enable individuals to track their daily vehicular carbon emission, and share them on social networks. It is intended to not only raise social awareness of vehicular carbon emission and encourage more efficient driving behavior, but also serve as a research platform for data collection for research in vehicular traffic management, carbon emission, and user behavior analysis in social network based applications." @default.
• W2747676435 created "2017-08-31" @default.
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• W2747676435 date "2011-01-01" @default.
• W2747676435 modified "2023-09-24" @default.
• W2747676435 title "Next generation vehicular traffic management enabled by vehicular ad hoc networks and cellular mobile devices" @default.
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