Current Issue : January - March Volume : 2018 Issue Number : 1 Articles : 5 Articles
This study proposes a practical trial-and-error method to solve the optimal toll design problem of cordon-based pricing, where\nonly the traffic counts autonomously collected on the entry links of the pricing cordon are needed. With the fast development\nand adoption of vehicle-to-infrastructure (V2I) facilities, it is very convenient to autonomously collect these data. Two practical\nproperties of the cordon-based pricing are further considered in this article: the toll charge on each entry of one pricing cordon is\nidentical; the total inbound flow to one cordon should be restricted in order to maintain the traffic conditions within the cordon\narea. Then, the stochastic user equilibrium (SUE) with asymmetric link travel time functions is used to assess each feasible toll\npattern. Based on a variational inequality (VI) model for the optimal toll pattern, this study proposes a theoretically convergent\ntrial-and-error method for the addressed problem, where only traffic counts data are needed. Finally, the proposed method is\nverified based on a numerical network example....
Considering the complexity of lane changing using automated vehicles and the frequency of turning lanes in city settings, this paper\naims to generate an accelerated lane-changing trajectory using vehicle-to-vehicle collaboration (V2VC). Based on the characteristics\nof accelerated lane changing, we used a polynomial method and cooperative strategies for trajectory planning to establish a lanechanging\nmodel under different degrees of collaboration with the following vehicle in the target lane by considering vehicle\nkinematics and comfort requirements. Furthermore, considering the shortcomings of the traditional elliptical vehicle and round\nvehicle models, we established a rectangular vehicle model with collision boundary conditions by analysing the relationships\nbetween the possible collision points and the outline of the vehicle. Then, we established a simulation model for the accelerated\nlane-changing process in different environments under different degrees of collaboration. The results show that, by using V2VC,\nwe can achieve safe accelerated lane-changing trajectories and simultaneously satisfy the requirements of vehicle kinematics and\ncomfort control....
Modern vehicles are equipped with a plethora of on-board sensors and large on-board\nstorage, which enables them to gather and store various local-relevant data. However, the wide\napplication of vehicular sensing has its own challenges, among which location-privacy preservation\nand data query accuracy are two critical problems. In this paper, we propose a novel range query\nscheme, which helps the data requester to accurately retrieve the sensed data from the distributive\non-board storage in vehicular ad hoc networks (VANETs) with location privacy preservation.\nThe proposed scheme exploits structured scalars to denote the locations of data requesters and\nvehicles, and achieves the privacy-preserving location matching with the homomorphic Paillier\ncryptosystem technique. Detailed security analysis shows that the proposed range query scheme can\nsuccessfully preserve the location privacy of the involved data requesters and vehicles, and protect\nthe confidentiality of the sensed data. In addition, performance evaluations are conducted to show\nthe efficiency of the proposed scheme, in terms of computation delay and communication overhead.\nSpecifically, the computation delay and communication overhead are not dependent on the length of\nthe scalar, and they are only proportional to the number of vehicles....
Plenty of multimedia contents such as traffic images, music, and movies pose great challenges for content downloading due to\nthe high mobility of vehicles and intermittent connectivity for vehicular ad hoc networks. Roadside units or APs can improve\nthe efficiency of content downloading but with the cost of large investments. In this paper, an efficient content downloading\nscheme is proposed with the assistance of parking clusters, which are formed by roadside parked cars. After receiving the\ndownloading request, the parking clusters, which the downloader will travel through according to the estimated trajectory, will\nmake a download scheduling for the downloader. Then the downloader acquires the content chunks while it drives through the\nparking clusters. Simulation results show that the proposed scheme achieves better performance than intervehicle approach and\nRSU based approach....
Dedicated short-range communication (DSRC) and 4G-LTE are two widely used candidate schemes for Connected Vehicle (CV)\napplications. It is thus of great necessity to compare these two most viable communication standards and clarify which one canmeet\nthe requirements of most V2X scenarios with respect to road safety, trafficefficiency, and infotainment.To the best of our knowledge,\nalmost all the existing studies on comparing the feasibility of DRSC or LTE in V2X applications use software-based simulations,\nwhichmay not represent realistic constraints. In this paper, a Connected Vehicle test-bed is established, which integrates the DSRC\nroadside units, 4G-LTE cellular communication stations, and vehicular on-board terminals. Three Connected Vehicle application\nscenarios are set as Collision Avoidance, Traffic Text Message Broadcast, and Multimedia File Download, respectively. A software\ntool is developed to record GPS positions/velocities of the test vehicles and record certain wireless communication performance\nindicators.The experiments have been carried out under different conditions.According to our results, 4G-LTE ismore preferred for\nthe nonsafety applications, such as traffic information transmission, file download, or Internet accessing, which does not necessarily\nrequire the high-speed real-time communication, while for the safety applications, such as Collision Avoidance or electronic traffic\nsign, DSRC outperforms the 4G-LTE....
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