Results 1 -
8 of
8
1 On the Effectiveness of an Opportunistic Traffic Management System for Vehicular Networks
"... Abstract—Road congestion results in a huge waste of time and productivity for millions of people. A possible way to deal with this problem is to have transportation authorities distribute traffic information to drivers, which in turn can decide (or be aided by a navigator) to route around congested ..."
Abstract
-
Cited by 15 (5 self)
- Add to MetaCart
(Show Context)
Abstract—Road congestion results in a huge waste of time and productivity for millions of people. A possible way to deal with this problem is to have transportation authorities distribute traffic information to drivers, which in turn can decide (or be aided by a navigator) to route around congested areas. Such traffic information can be gathered by relying on static sensors placed at specific road locations (e.g., induction loops, video cameras) or by having single vehicles report their location, speed and travel time. While the former approach has been widely exploited, the latter has seen birth only more recently, and, consequently, its potential is less understood. For this reason, in this paper we study a realistic test case that allows to evaluate the effectiveness of such a solution. As part of this process: a) we designed a system that allows vehicles to crowd-source traffic information in an Ad-Hoc manner, allowing them to dynamically reroute based on individually collected traffic information, b) we implemented a realistic network-mobility simulator that allowed us to evaluate such a model, and c) the main focus of this paper: we performed a case study that evaluates whether such a decentralized system can help drivers to minimize trip times. This study is based on traffic survey data from Portland, Oregon and our results indicate that such navigation systems can indeed greatly improve traffic flow. Finally, to test the feasibility of our approach we implemented our system and run some real experiments at UCLA’s C-Vet test-bed.
Communication requirements for crash avoidance
- In Proceedings of the seventh ACM international workshop on VehiculAr InterNETworking (2010), VANET ’10, ACM
"... ABSTRACT Safety applications are a driving force behind VANET deployment. Automobile manufacturers, government organizations, and consortia of the two have been investigating using VANETs for safety applications. Though VANETs are in large part designed for safety applications, researchers do not y ..."
Abstract
-
Cited by 10 (1 self)
- Add to MetaCart
(Show Context)
ABSTRACT Safety applications are a driving force behind VANET deployment. Automobile manufacturers, government organizations, and consortia of the two have been investigating using VANETs for safety applications. Though VANETs are in large part designed for safety applications, researchers do not yet know the communication requirements of VANET safety messages. As a result, protocol designers have relied on generic network success metrics, such as packet delivery ratio, to evaluate their protocols. However, a more useful metric is the ability of currently proposed VANET schemes (e.g., for authentication, power control, etc.) to allow vehicles to receive safety messages and warn their drivers sufficiently in advance of an accident so that the driver can avoid the accident. Besides the basic safety message service, researchers have proposed other VANET mechanisms and services including mix zones Previous attempts at answering the above questions have been made using small test beds without any collisions and using vehicle kinematics and message reception probabilities. However, each of these approaches lack the realism (i.e., actual crashes) and scale that VANETs will have. In this paper, we present our results from simulating two vehicular safety applications. We simulated crash scenarios and determined the probability that vehicles could avoid the crashes. Additionally, we measured the communication requirements needed for those probabilities.
Modeling and Experimenting with Vehicular Congestion for Distributed Advanced Traveler Information Systems
"... Abstract. Advanced Traveler Information Systems, which have for long been regarded as one of the most promising future applications of wireless vehicular networks for use in the field of Intelligent Transportation Sys-tems (ITS), are effectively becoming part of today’s reality. Many drivers already ..."
Abstract
-
Cited by 1 (0 self)
- Add to MetaCart
(Show Context)
Abstract. Advanced Traveler Information Systems, which have for long been regarded as one of the most promising future applications of wireless vehicular networks for use in the field of Intelligent Transportation Sys-tems (ITS), are effectively becoming part of today’s reality. Many drivers already access the information provided by such systems, for example checking for the state of the streets along a given route or reading traffic jam alerts on the displays of smart-phones or Personal Navigation De-vices (PNDs). Based on such information, drivers, or their PNDs, select the best paths to reach their destinations. Clearly, in order to be effec-tive, such systems are required to reliably estimate and forecast vehicular congestion states. Moreover, they should also be capable of efficiently uti-lizing the wireless channel resources, as the amount of information that may be exchanged by such systems in dense urban areas grows with the number of services supported by the onboard devices and the amount of vehicles that install them. To answer these challenges, we here discuss how a distributed ATIS can: a) implement an effective vehicular con-gestion detection and forecasting model, and, b) efficiently disseminate traffic information. The advantage of distributing an ATIS is that each vehicle can compute and redistribute accurate vehicular congestion in-formation very rapidly, with little overhead and without resorting to a central entity. In order to validate our approach, we present the outcomes of a real world experimentation, as well as of multiple simulations. 1
A Preference-based Privacy Protection for Value-added Services in Vehicular Ad Hoc Networks
"... Abstract Due to the rapid growth of smart devices, the development of VANET tends to mature. Although many methods have been proposed to resolve the user privacy issue in vehicular ad hoc network (VANET), users still didn’t know what information is collected (e.g. geolocation) and how to use.In this ..."
Abstract
- Add to MetaCart
(Show Context)
Abstract Due to the rapid growth of smart devices, the development of VANET tends to mature. Although many methods have been proposed to resolve the user privacy issue in vehicular ad hoc network (VANET), users still didn’t know what information is collected (e.g. geolocation) and how to use.In this paper, we propose a secure and anonymous scheme for communication, which is based on blind signature techniques, and user can set their own privacy preferences before joining the VANET. Our proposed scheme lets user know whether his/her privacy preferences is suitable for VANET environment, and provide appropriate value-added service to user. Finally we will show our proposed scheme meets various security requirements.
SECURITY AND PRIVACY OF VEHICULAR AD HOC NETWORKS SUPPORTING REVOCATION
, 2010
"... In vehicular ad hoc networks (VANETs), vehicles communicate with other vehicles or fixed infrastructure, called road-side units (RSUs). One of the main goals for VANETs is to improve vehicle safety. Work has begun on defining and implementing VANET safety applications. VANET security services will b ..."
Abstract
- Add to MetaCart
(Show Context)
In vehicular ad hoc networks (VANETs), vehicles communicate with other vehicles or fixed infrastructure, called road-side units (RSUs). One of the main goals for VANETs is to improve vehicle safety. Work has begun on defining and implementing VANET safety applications. VANET security services will be standardized in IEEE 1609.2. Safety application message broadcasts will include reports of vehicles ’ positions, velocities, and accelerations. Vehicles will use these messages as the basis for presenting warnings to drivers. An insecure, distributed, wireless, easily accessible vehicular safety system could easily be taken advantage of and actually result in poorer vehicular safety. VANET safety messages need to be secured to mitigate falsified reports from malicious actors and to detect erroneous reports generated by malfunctioning vehicles. Concretely, safety messages must be authenticated to a vehicle, and a malicious or malfunctioning vehicle (i.e., one that creates falsified or erroneous messages) should have its credentials (i.e., its certificate or certificates) revoked. In the eyes of government agencies and of automobile
Scalable Reactive Vehicle-to-Vehicle Congestion Avoidance Mechanism
"... Abstract—The increasing popularity and acceptance of VANETs will make the deployment of autonomous vehicles easier and faster since the VANET will reduce dependence on expensive sensors. Many useful applications will be possible with the usage of VANETs, which will improve the safety and quality of ..."
Abstract
- Add to MetaCart
(Show Context)
Abstract—The increasing popularity and acceptance of VANETs will make the deployment of autonomous vehicles easier and faster since the VANET will reduce dependence on expensive sensors. Many useful applications will be possible with the usage of VANETs, which will improve the safety and quality of trips for the owners of these vehicles. One of these applications is the avoidance of traffic congestion by smart dynamic rerouting. For scalability, current cloud-based solutions, like Google Maps traffic, update congestion levels after a time interval rather than providing real-time measurements. In this paper, we introduce a vehicle-to-vehicle congestion avoidance mechanism, which detects real-time congestion levels and reroutes vehicles accordingly to minimize their trip times. Our system is highly distributed and is, therefore, not subjected to the limitations of centralized congestion mechanisms. We show via simulation that our system can significantly decrease the trip times of vehicles as well as the average car density on the map. Our proposed system, with its checkpoint and offline path generation approaches, is more responsive to local congestion level changes and computationally less complex for least-congested-route calculations than state-of-the-art congestion avoidance mechanisms. I.
Congestion Attacks to Autonomous Cars Using Vehicular Botnets
"... Abstract—The increasing popularity and acceptance of VANETs will make the deployment of autonomous vehicles easier and faster since the VANET will reduce dependence on expensive sensors. However, these benefits are counterbalanced by possible security attacks. We demonstrate a VANET-based botnet att ..."
Abstract
- Add to MetaCart
(Show Context)
Abstract—The increasing popularity and acceptance of VANETs will make the deployment of autonomous vehicles easier and faster since the VANET will reduce dependence on expensive sensors. However, these benefits are counterbalanced by possible security attacks. We demonstrate a VANET-based botnet attack in an autonomous vehicle scenario that can cause serious congestion by targeting hot spot road segments. We show via simulation that the attack can increase the trip times of the cars in the targeted area by orders of magnitude. After 5 minutes, the targeted road becomes completely unusable. More importantly, the effect of such an attack is not confined to a specific hotspot; the congestion can spread to multiple roads and significantly affect the entire urban grid. We show that current countermeasures are not effective, and point to new possible defenses. I.
