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Journal of Transportation Technologies 2013年第1期3卷 88-104页

作者： Vaishali D. Khairnar Srikhant N. Pradhan Computer Department Institute of Technology Nirma University

In this paper the DSRC/IEEE 802.11p Medium Access Control (MAC) method of the vehicular communication has been simulated on highway road scenario with periodic broadcast of packets in a vehicle-to-vehicle situation. IEEE 802.11p MAC method is basically based on carrier sense multiple accesses (CSMA) where nodes listen to the wireless channel before sending the packets. If the channel is busy, the vehicle node must defer its access and during high utilization periods this could lead to unbounded delays. This well-known property of CSMA is undesirable for critical communications scenarios. The simulation results reveal that a specific vehicle is forced to drop over 80% of its packets/messages because no channel access was possible before the next message/packet was generated. To overcome this problem, we propose to use self-organizing time division multiple access (STDMA) for real-time data traffic between vehicles. Our initial results indicate that STDMA outperforms CSMA for time-critical traffic safety applications in ad- hoc vehicular networks.

关键词： STDMA CSMA MAC DSRC IEEE 802.11p vehicle-to-vehicle Etc

An Improved Non-Geometrical Stochastic Model for Non-WSSUS vehicle-to-vehicle Channels

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ZTE Communications 2019年第4期17卷 62-71页

作者： HUANG Ziwei CHENG Xiang ZHANG Nan State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Engineering and Computer SciencePeking UniversityBeijing 100871China Key Laboratory of Wireless Sensor Network&Communication Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China Wireless Algorithm Department Product Research and Development SystemZTE CorporationShanghai 201203China

A novel non-geometrical stochastic model(NGSM)for non-wide sense station ary uncorrelated scattering(non-WSSUS)vehicle-to-vehicle(V2V)channels is *** model is based on a conventional NGSM and employs a more accurate method to reproduce the realistic characteristics of V2V channels,which successfully extends the existing NGSM to include the line-of-sight(LoS)***,the statistical properties of the proposed model in different scenarios,including Doppler power spectral density(PSD),power delay profile(PDP),and the tap correlation coefficient matrix are simulated and compared with those of the existing ***,the simulation results dem onstrate not only the utility of the proposed model,but also the correctness of our theoreti cal derivations.

关键词： vehicle-to-vehicle non-WSSUS channels non-geometrical stochastic model LoS component statistical properties

An Improved Non-Geometrical Stochastic Model for Non-WSSUS vehicle-to-vehicle Channels

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An Improved Non-Geometrical Stochastic Model for Non-WSSUS V...

Application-Oriented Performance Comparison of 802.11p and LTE-V in a V2V Communication System

2018中国信息通信大会(CICC2018)

作者： Ziwei Huang Xiang Cheng State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Engineering and Computer Science Peking University

In this paper,we propose a novel non-geometrical stochastic model(NGSM)for non-wide sense stationary uncorrelated scattering(non-WSSUS)vehicle-to-vehicle(V2V)*** proposed model is based on a conventional NGSM and employs a more accurate method to reproduce the realistic characteristics of V2V channels,which successfully extends the existing NGSM to include the line-of-sight(LoS)***,the statistical properties of the proposed model in different scenarios,including Doppler power spectral density(PSD),power delay profile(PDP),and the tap correlation coefficient matrix are simulated and compared with those of the existing ***,the simulation results demonstrate not only the utility of the proposed model,but also the correctness of our theoretical derivations.

关键词： vehicle-to-vehicle non-WSSUS channels non-geometrical stochastic model LoS component statistical properties

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Tsinghua Science and Technology 2019年第2期24卷 123-133页

作者： Mengkai Shi Yi Zhang Danya Yao Chang Lu Department of Automation Tsinghua University National Laboratory for Information Science and Technology (TNList) Tsinghua University Jiangsu Province Collaborative Innovation Center of Modern Urban Traffic Technologies Tsinghua-Berkeley Shenzhen Institute(TBSI)

In recent years, the vehicle-to-vehicle(V2V) communication system has been considered one of the most promising technologies to build a much safer and more efficient transportation system. Both simulation and field test have been extensively performed to evaluate the performance of the V2V communication system. However,most of the evaluation methods are communication-based, and although in a transportation environment, lack a V2V application-oriented analysis. In this study, we conducted real-world tests and built an application-oriented evaluation model. The experiments were classified into four scenarios: static, following, face 2 face, and crossing vertically, which almost covered all the V2V communication patterns on the road. Under these scenarios, we conducted experiments and built a probability model to evaluate the performance of 802.11p and LTE-V in safetyrelated applications. Consequently, we found out that improvements are still needed in Non-Line-of-Sight scenarios.

关键词： vehicle-to-vehicle (V2V)communication connected vehicles performance evaluation intelligent transportation system application-oriented field test

V2V Channel Modeling at 5.2 GHz for Highway Environment

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China Communications 2022年第11期19卷 112-128页

作者： Suying Jiang Wei Wang Ibrahim Rashdan School of Information Engineering Chang’an UniversityXi’an 710064China Institute of Communications and Navigation German Aerospace Center(DLR)Oberpfaffenhofen 82234Germany

To design and evaluate vehicle-to-vehicle(V2V)communication systems in intelligent transportation system(ITS),it is important to understand the propagation mechanisms and channel models of V2V *** paper aims to analyze the channel models at 5.2 GHz for the highway environment in obstructed line-of-sight(OLoS)and line-of-sight(LoS)scenarios,particularly the vehicle connectivity probability derivation based on the propagation model obtained from ***,the path loss(PL),shadow fading(SF),narrowband K-factor,and small-scale amplitude fading are *** showed that the received signal magnitude follows Rice and Weibull distribution in LoS and OLoS scenarios,***,we develop simple and low-complexity tapped delay line(TDL)models with a 10 MHz bandwidth for LoS and OLoS scenarios;in addition,we investigate the wideband K-factor,the root mean square delay spread(RMS-DS),and delay-Doppler ***,we derive the closed form connectivity probability between any two vehicles in the presence of Weibull fading channel,and analyze the effects of Weibull fading channel and traffic parameters on *** is found that Weibull fading parameter,transmit power and vehicle density have positive impact on connectivity probability,PL exponent has negative impact on connectivity probability.

关键词： channel model connectivity highway tapped delay line model vehicle-to-vehicle

Evaluation of Effective vehicle Probe Information Delivery with Multiple Communication Methods

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Communications and Network 2015年第2期7卷 71-80页

作者： Tatsuya Yamada Mayu Mitsukawa Hideki Shimada Kenya Sato Mobility Research Center Doshisha University Kyoto Japan

vehicle probe information delivery systems can be broadly divided into the center type and center-less type. Since conventional center-type information delivery systems generate a large load on the communications infrastructure and data center, research efforts have come to be focused on the centerless type. However, existing vehicle probe information delivery systems suffer from various problems including a limited service area, low delivery efficiency, and lack of immediacy in delivery. Our objective in this study is efficient delivery of vehicle probe information as needed. We propose a delivery scheme that uses vehicle-to-vehicle communication, infrastructure-to-vehicle communication, and mobile communication as well as Geo cast. This combined use of multiple communication methods achieves efficient information delivery by changing the communication method to fit the current situation. The results of an evaluation by simulation showed that the proposed scheme could deliver information efficiently in a variety of environments.

关键词： vehicle Probe Information ITS Style vehicle-to-vehicle Communication

How Do V2V and V2I Messages Affect the Performance of Driving Smart vehicles?

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Computer Systems Science & Engineering 2023年第11期47卷 2313-2336页

作者： Abdullah Alsaleh Department of Information Engineering Florence UniversityFlorenceItaly Department of Computer Engineering College of Computer and Information SciencesMajmaah UniversityMajmaahSaudi Arabia

Intelligent transportation systems(ITSs)are becoming increasingly popular as they support efficient coordinated *** aim to improve the safety,efficiency and reliability of road transportation through integrated approaches to the exchange of relevant *** adhoc networks(MANETs)and vehicle ad-hoc networks(VANETs)are integral components of *** VANET is composed of interconnected vehicles with sensitivity capabilities to exchange traffic,positioning,weather and emergency *** of the main challenges in VANET is the reliable and timely dissemination of information between vehicular nodes to improve decision-making *** paper illustrates challenges in VANET and reviews possible solutions to improve road safety control and management using V2V and V2I *** paper also summarizes existing rules-based and optimized-based solutions,including reducing the effect of mixed environments,obstacles,malfunctions and short wireless ranges on transportation efficiency and reducing false messages that cause unintended vehicle actions and unreliable transportation ***,an event simulation algorithm was designed to maximize the benefits of exchangeable messages among ***,simulated VANET environments were developed to demonstrate how the algorithm can be used for transformable *** results show that coupling of both V2V and V2I messages yielded better results in terms of end-to-end delay and average *** research directions were highlighted to be taken into account in the development of ITS and intelligent routing mechanisms.

关键词： vehicle-to-vehicle vehicle-to-infrastructure transport systems

Mandatory Lane Change Strategy and Algorithm for VANET Using Stackelberg Model

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Mandatory Lane Change Strategy and Algorithm for VANET Using...

作者： Akira Maria 大连理工大学

学位级别：硕士

车辆行驶过程中由于受到交通道路以及周围车辆状态等因素影响,常常会被迫换道。例如,在高速公路上行驶的车辆,由于匝道的限制或者交通拥塞等情况,不得不进行换道。车辆换道由于具有随机性或突发性,会影响道路中其他车辆行驶的流畅性。... 详细信息

车辆行驶过程中由于受到交通道路以及周围车辆状态等因素影响,常常会被迫换道。例如,在高速公路上行驶的车辆,由于匝道的限制或者交通拥塞等情况,不得不进行换道。车辆换道由于具有随机性或突发性,会影响道路中其他车辆行驶的流畅性。特别是当车辆在高速行驶过程中,换道行为甚至可能引发交通事故。因此,研究车辆的协同换道策略可以降低交通路网中车辆行驶事故发生几率,具有重要的研究意义。针对上述问题,本文利用Stackelberg博弈模型,结合车联网技术,提出了车辆换道策略并设计了相关算法。具体研究内容如下。本论文首先研究了Stackelberg模型,并结合车辆行驶状态设计了收益函数。为了进一步分析收益情况,本文将驾驶员驾驶行为用车辆行驶速度进行描述,并对现有的收益公式进行改进。其中驾驶行为根据车辆行驶速度分为激进型和舒适型。车辆在执行换道前必须计算收益,并根据收益值进行决策。具体操作过程是,每当车辆向前移动时,所有车辆收益值都将根据运动趋势提前进行计算。为了预测周围车辆未来的运动趋势,本文使用了模型预测控制器。此外,本文还将方法分为两个不同的跟车模型,即经典的2秒跟车模型和SUMO交通仿真软件里默认的Krauss跟车模型。针对上述两种跟车模型在换道过程中具体性能和安全性,本文也给出了一定的分析。最后,本文结合Stackelberg模型和模型预测控制器,设计了强制换道策略和对应算法,进而为换道车辆提供合理的换道时间。为了对所提算法进行有效性分析,本文结合SUMO交通仿真软件,进行了相关实验。首先,本文按照参与换道的车辆的数量,设计了三种不同交通流密度的交通仿真场景。针对上述交通场景,本文进行了实验与分析。最后,为了分析具体的效率和性能,本文利用仿真数据,将本文所提算法与其他现有算法进行对比分析,验证了本文算法在仿真场景中具有较好性能。

关键词：车道变更策略 vehicle-to-vehicle 模型预测控制博弈论

Review of the Security Issues in Vehicular Ad Hoc Networks (VANET)

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International Journal of Communications, Network and System Sciences 2015年第13期8卷 552-566页

作者： Arif Sari Onder Onursal Murat Akkaya Department of Management Information Systems Girne American University Kyrenia Cyprus Department of Management Information Systems European University of Lefke Lefke Cyprus

There is a significant increase in the rates of vehicle accidents in countries around the world and also the casualties involved ever year. New technologies have been explored relating to the Vehicular Ad Hoc Network (VANET) due to the increase in vehicular traffic/congestions around us. Vehicular communication is very important as technology has evolved. The research of VANET and development of proposed systems and implementation would increase safety among road users and improve the comfort for the corresponding passengers, drivers and also other road users, and a great improvement in the traffic efficiency would be achieved. This research paper investigates the current and existing security issues associated with the VANET and exposes any slack amongst them in order to lighten possible problem domains in this field.

关键词： Vehicular Ad Hoc Network (VANET) MANET vehicle-to-vehicle (V2V) Communication vehicle-to-Infrastructure (V2I) Communication

Simulation Evaluation of Filtering Method for Improving Pedestrian Positioning Accuracy Using Signal Strengths

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Wireless Sensor Network 2019年第6期11卷 81-94页

作者： Yuya Nishimaki Hisato Iwai Kenya Sato Computer and Information Science Graduate School of Science and Engineering Doshisha University Kyoto Japan Electrical and Electronic Engineering Graduate School of Science and Engineering Doshisha University Kyoto Japan

In recent years, we have been able to use various services using the position information of smartphones and tablets. In addition, research on intelligent transport systems (ITS) has been actively conducted. To consider reducing traffic accidents by exchanging position information between pedestrians and vehicles by vehicle-to-pedestrian communication, we require accurate position information for pedestrians and vehicles. The GPS (global positioning system) is the most widely used method for acquiring position information. However, in urban areas, the GPS signal is affected by the surrounding buildings, which increases the positioning error. In this study, a method to improve the positioning accuracy of pedestrians using the signal strengths from vehicles and beacons was proposed. First, a Kalman filter was applied to the signal strength. Then, the path loss index was dynamically calculated using vehicle-to-vehicle communication. Finally, the position of a pedestrian was obtained using weighted centroid localization (WCL) after filtering the nodes. The positioning accuracy was evaluated using a simulator and demonstrated the superiority of the proposed method.

关键词： Outdoor Positioning vehicle-to-Pedestrian Communication vehicle-to-vehicle Communication Signal Strength Path Loss Index WCL