Traffic Operations and Management

Effects of vehicle-vehicle/roadside-vehicle communication on adaptive cruise controlled highway systems

Xu, Qing
Hedrick, K.
Sengupta, R.
VanderWerf, J.
2002

We study the effect of vehicle vehicle/vehicle-roadside communication on the performance of adaptive cruise control (ACC) systems. Two simulation works are presented One is a single ACC vehicle simulation using MATLAB/SIMULINK. A cut-in scenario and a braking scenario are tested Communication greatly saves control effort in the former scenario, while has little effect in the latter. The other work simulates ACC controlled highway merging with SHIFT language. The results show beneficial effects of communication in terms of braking effort, waiting-to-merge queue length, and main lane traffic...

Empirical determination of channel characteristics for DSRC vehicle-to-vehicle communication

Taliwal, Vikas
Jiang, Daniel
Mangold, Heiko
Chen, Chi
Sengupta, Raja
2004

Dedicated Short Range Communication (DSRC) wireless band, allocated by the FCC for vehicular communication, constitutes the basis for one of the first vehicular ad-hoc networks/systems that is likely to be deployed. Therefore, it is important to characterize the physical properties of the DSRC channel.In this work we propose that due to the complexity, unpredictability and wide variety of road environments a statistical parametric model should be used to describe the physical channel behavior, and its parameters should be inferred from empirical data.Based on this methodological approach...

Evaluation of Real-Time Freeway End-of-Queue Alerting System to Promote Driver Situational Awareness

Nowakowski, Christopher
Vizzini, Daniel
Gupta, Somak Datta
Sengupta, Raja
2012

This paper presents the final results of a connected-vehicles field experiment conducted under the U.S. Department of Transportation's SafeTrip-21 Initiative. A real-time freeway end-of-queue alerting system was developed and tested at 3,400 locations along San Francisco Bay Area freeways in California. The Networked Traveler Foresighted Driving Advanced Driver Assistance System, which used vehicle-to-infrastructure communication, provided drivers with an auditory alert when they approached slow traffic ahead on a freeway to improve the driver's situational awareness. The system was not a...

Failure Diagnosis Using Discrete-Event Models

Sampath, M.
Sengupta, R.
Lafortune, S.
Sinnamohideen, K.
Teneketzis, D.C.
1996

Detection and isolation of failures in large, complex systems is a crucial and challenging task. The increasingly stringent requirements on performance and reliability of complex technological systems have necessitated the development of sophisticated and systematic methods for the timely and accurate diagnosis of system failures. We propose a discrete-event systems (DES) approach to the failure diagnosis problem. This approach is applicable to systems that fall naturally in the class of DES; moreover, for the purpose of diagnosis, continuous-variable dynamic systems can often be viewed as...

Fair scheduling for real-time multimedia support in IEEE 802.16 wireless access networks

Fallah, Yaser P.
Nasiopoulos, Panos
Sengupta, Raja
2010

Successful deployment of Broadband Wireless Access Networks such as WiMAX (IEEE 802.16) will be contingent on provisions for supporting multimedia traffic. In this paper, we review the quality of service features of access networks such as the 802.16 standard, and identify algorithms and schemes that are needed for supporting multimedia traffic in such networks. The 802.16 standard only specifies the features that should be implemented and leaves the design of a quality of service solution to developers. This includes the design of a mandatory scheduling framework. We present a...

Hierarchical Vertiport Network Design for On-Demand Multi-modal Urban Air Mobility

Peng, Xin
Bulusu, Vishwanath
Sengupta, Raja
2022

The vertiports that connect ground and air transportation modes play a critical role in enabling Urban Air Mobility (UAM). Parameters like aircraft occupancy and vertiport operational capacity, along with the ground traffic congestion near vertiports have dominant impacts on the vertiport network design and consequently on the total addressable market and value proposition of UAM. We propose a hierarchical method to design a vertiport network for multi-modal UAM with multiple-seat aircraft based on the passenger demand. Our objective is to determine vertiport locations and assign...

Implementation and Evaluation of Scalable Vehicle-to-Vehicle safety Communication Control

Huang, Ching-Ling
Sengupta, Raja
Krishnan, Hariharan
Fallah, Yaser P.
2011

Vehicle-to-vehicle (V2V) communications play a critical role in enabling numerous important cooperative safety applications. V2V safety communications rely on broadcast of self-state information (e.g., position, speed, and heading) by each vehicle, which allows a vehicle to track its neighboring vehicles in real time. One of the most pressing challenges in this research is to maintain acceptable tracking accuracy of neighboring vehicles while avoiding congestion in the shared communication channel. In this article we describe the evaluation of a transmission control protocol that adapts...

Implementation andEevaluation of Scalable Vehicle-to-Vehicle Transmission Control Protocol

Huang, Ching-Ling
Krishnan, Hariharan
Sengupta, Raja
Fallah, Yaser P.
2010

Vehicle-to-Vehicle (V2V) communications play a critical role in enabling important cooperative safety applications. V2V safety communications rely on broadcast of self-state information (e.g., position, speed, and heading) by each vehicle, which allows a vehicle to track its neighboring vehicles in real-time. One of the most pressing challenges in this research is to maintain an acceptable tracking accuracy of neighboring vehicles while avoiding congestion in the shared communication channel. In this paper we describe the evaluation of a transmission control protocol that adapts the...

Information Dissemination Control for Cooperative Active Safety Applications in Vehicular Ad-Hoc Networks

Huang, Ching-Ling
Fallah, Yaser P.
Sengupta, Raja
Krishnan, Hariharan
2009

Vehicular ad-hoc networks (VANETs) play a critical role in enabling highway active safety applications such as collision warning and vehicle tracking. The most pressing challenge in enabling such applications is to maximize the amount of disseminated vehicle state information while avoiding network congestion. In this paper, we explore the structure of VANET tracking problem and propose an adaptive rate control algorithm based on network condition and tracking error. Proposed algorithm uses a closed-loop control concept and accounts for the lossy channel. This algorithm is shown to achieve...

Integrated Multi-Channel Vehicle-Vehicle and Vehicle-Roadside Communications for ITS

Mak, Tony K.
Laberteaux, Kenneth P.
Sengupta, Raja
Ergen, Mustafa
2025

This research describes a medium access control (MAC) protocol to Enable multi-channel operation for dedicated short-range communication (DSRC). In particular, we focus on the challenge of supporting potentially high-bandwidth commercial or infotainment communications between vehicle and roadside in hotspots over several service channels, while concurrently enabling time-critical vehicle-vehicle communication for safety in a separate channel. In our architecture, within hotspots, communication is aided by one of the access points in the hotspot. This access point is designated the...