Safety

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

Huang, Ching-Ling
Fallah, Yaser P.
Raja Sengupta
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...

Reducing the Communication Required By DSRC-Based Vehicle Safety Systems

Rezaei, Shahram
Raja Sengupta
Krishnan, Hariharan
2009

We present an adaptive communication scheme for cooperative active safety system (CASS). CASS uses information communicated from neighboring vehicles via wireless communication in order to actively evaluate driving situations and provide warnings or other forms of assistance to drivers. In CASS, we assume that vehicles are equipped with a GPS receiver, a dedicated short range communications (DSRC) transceiver, and in-vehicle sensors. The information exchanges between vehicles include position, speed, heading, and other vehicle kinematic and dynamic information, and the information is...

Learning User Perception to Traveler Situation Awareness Alerts on Mobile Devices

Manasseh, Christian
Fallah, Yaser P.
Raja Sengupta
Misener, James A.
2010

The use of mobile devices to deliver traveler information such as situation awareness and navigation guidance is on the rise. However, an optimal experience – and even more widespread use – may be impeded by the lack of personalized, user-tailored applications. The issue is that users react differently to traffic information, and information perceived useful by one user may be considered as nuisance by another. The authors provide evidence of this from a pilot field test performed on a situation awareness application that alerts the user of approaching slow traffic 1.6 km ahead. The...

Adaptive Intervehicle Communication Control for Cooperative Safety Systems

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

Vehicular ad hoc networks play a critical role in enabling important active safety applications such as cooperative collision warning. These active safety applications rely on continuous broadcast of self-information by all vehicles, which allows each vehicle to track all its neighboring cars in real time. The most pressing challenge in such safety-driven communication is to maintain acceptable tracking accuracy while avoiding congestion in the shared channel. In this article we propose a transmission control protocol that adapts communication rate and power based on the dynamics of a...

Design of Cooperative Vehicle Safety Systems Based on Tight Coupling of Communication, Computing and Physical Vehicle Dynamics

Fallah, Yaser P.
Huang, ChingLing
Raja Sengupta
Krishnan, Hariharan
2010

One of the main characteristics of a Cyber Physical System (CPS) is the tight coupling of the computing and communications aspects of the system with its physical dynamics. In this paper, we examine this characteristic for a cooperative vehicle safety (CVS) system, and identify how the design and operation of such CPSs should consider this tight coupling. In CVS systems, vehicles broadcast their physical state information over a shared wireless network to allow their neighbors to track them and predict possible collisions. The physical dynamics of vehicle movement and the required accuracy...

Using Smartphones to Enable Situation Awareness on Highways

Manasseh, Christian
Fallah, Yaser P.
Raja Sengupta
Misener, James A.
2010

Motivated by the proliferation of Smartphone devices, the authors present a system architecture to enable the delivery and exchange of intelligent transportation systems (ITS) messages to Smartphones on the road. The purpose is to provide an ITS situation awareness system architecture that would enable application developers to build Smartphone applications for ITS mobility and safety. The authors present a “Slow Traffic Ahead” application as a means to validate the architecture and perform a field experiment in the San Francisco Bay Area comprised of 30 users to test the performance of...

Making indoor maps with portable accelerometer and magnetometer

Xuan, Yiguang
Raja Sengupta
Fallah, Yaser
2010

The paper describes algorithms required to enable the crowd sourcing of indoor building maps, i.e., where global positioning system (GPS) is not available. Nevertheless to enable crowd sourcing we use the 3-axis accelerometers and the 3-axis magnetometers available in many smart phones. Volunteers carry the phones while walking around in buildings, and use some application on their smart phones to send the data to a mapping server. We present the algorithms to obtain walking trajectories from the data by dead reckoning, and to estimate indoor maps with multiple walking trajectories.

Congestion Control Based on Channel Occupancy in Vehicular Broadcast Networks

Fallah, Yaser P.
Huang, ChingLing
Raja Sengupta
Krishnan, Hariharan
2010

Cooperative vehicle safety (CVS) systems rely on vehicular ad-hoc networks operating in broadcast mode to deliver vehicle tracking and safety information to neighboring cars. This information is used to enable collision avoidance and warning systems. One of the main challenges of the eventual large scale deployment of such systems is network congestion, which could critically degrade the quality of a CVS system. In this paper, we present a method for congestion monitoring and control based on limited feedback from the network. We study the relationship between channel occupancy, as a...

VII California: Development and Deployment Proof of Concept and Group-Enabled Mobility and Safety (GEMS)

Misener, Jim
Raja Sengupta
Ahern, Katherine
Gupta, Somak Datta
Dickey, Susan
Kuhn, Tom
Lian, Thang
Manasseh, Christian
Nelson, David
Rezai, Shahram
Sharafsaleh, Ashkan
Shladover, Steven
VanderWerf, Joel
2010

This PATH Research Report covers the (Vehicle-Infrastructure Integration) VII California Development and Deployment (Task Order6217) efforts beginning in 2008 and concluding June 30, 2009. This is a successor to the report for TO 5217and reports theapplications-oriented research subsequent to that work.The report is organized by a synopsis of the background and reasons for the VII California project, then it summarizes some of the antecedent (TO 5217) work: the "Innovative Mobility Showcase" (2005), which established the architecture and, importantly the applications (curve overspeed...

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

Huang, Ching-Ling
Krishnan, Hariharan
Raja Sengupta
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...