Safety

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...

Layer-2 Protocol Design for Vehicle Safety Communications in Dedicated Short Range Communications Spectrum

Xu, Qing
Mak, T.
Ko, J.
Sengupta, R.
2004

This paper studies the design of layer-2 protocols for a vehicle or the roadside to send safety messages to other vehicles. The target is to meet vehicle safety applications' requirements of high reliability and low delay in reception. The communication is one-to-many, local, and geo-significant. The vehicular communication network is ad-hoc and highly dynamic, with potentially large number of contending nodes. We design several random access protocols residing in MAC and MAC extension layers. The protocols fit the DSRC multichannel architecture. Analytical bounds of the protocols'...

Learning User Perception to Traveler Situation Awareness Alerts on Mobile Devices

Manasseh, Christian
Fallah, Yaser P.
Sengupta, Raja
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...

Lower and Upper Bounds for a Multiple Depot UAV Routing Problem

Rathinam, Sivakumar
Sengupta, Raja
2006

This paper extends the well known Held-Karp's lower bound available for a single travelling salesman problem to the following multiple depot UAV routing problem (MDURP): Given a collection of UAVs that start at different depots, a set of terminals and destinations, the problem is to choose paths for each of the UAVs so that (1) each UAV starts at its respective depot, visits atleast one destination and reaches any one of the terminals not visited by other UAVs; (2) each destination is visited by exactly one UAV; and (3) the cost of the paths is a minimum among all possible paths for the...

Making indoor maps with portable accelerometer and magnetometer

Xuan, Yiguang
Sengupta, Raja
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.

Medium Access Control Protocol Design for Vehicle–Vehicle Safety Messages

Xu, Qing
Mak, Tony
Ko, Jeff
Sengupta, Raja
2007

We propose a medium access control protocol design for a vehicle to send safety messages to other vehicles. We develop a Quality-of-Service (QoS) model for safety messages that are consistent with the active vehicle safety systems literature. Each message has a range and useful lifetime. The QoS target has each message received with high probability within its specified lifetime by each vehicle within its specified range. The protocol design is based on rapidly rebroadcasting each message multiple times within its lifetime in combination with the 802.11 Distributed Coordination Function....

Middleware to enhance mobile communications for road safety and traffic mobility applications

Manasseh, C.
Sengupta, R.
2010

Middleware has emerged as an important architectural component in supporting distributed applications. The role of middleware is to present a unified programming model to application writers and to mask out problems of heterogeneity and distribution. It is motivated by the convergence of the embedded sensor and mobile communication revolutions in the automobile industry. The vehicle fleet is morphing into a vast mobile sensor fleet. The authors provide a middleware architecture and implementation that addresses the needs of a distributed system of mobile sensors comprised of vehicles and...