| 1. |
- Bilstrup, Katrin, et al.
(författare)
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Report on the Collaboration between CVIS and CERES in the Project Vehicle Alert System (VAS)
- 2009
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- In March 2007, an agreement was made for interchange of experiences between CVIS and the Centre for Research on Embedded Systems (CERES) at Halmstad University in Sweden. The majority of the work relating to this collaboration has been conducted within the CERES project Vehicle Alert System (VAS), aiming to use vehicle-to-vehicle (V2V) and vehicle-to-infrastructure (V2I) communications to provide different types of warning messages. The main focus of the VAS project is on communication and in particular the lower layers of the communication stack are investigated. VAS involves academic researchers from Halmstad University as well as researchers from Volvo Technology, SP Technical Research Institute of Sweden and the company Free2move. This report presents the results of the VAS project, its publications, and other issues of interest both to the CVIS consortium as well as a broader scope.
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| 2. |
- Bilstrup, Katrin, et al.
(författare)
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Vehicle Alert System
- 2007
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Ingår i: Proceedings of 14th world congress on intelligent transport system (ITS). ; , s. 2-9
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Konferensbidrag (refereegranskat)abstract
- The Vehicle Alert System (VAS) project focuses on cooperative alert services based on timely and reliable communication under the challenging circumstances pertaining to a highly mobile vehicular network. Through a cross-layer design, we gain the flexibility needed to adapt the system to the individual requirements of three chosen application scenarios that represent different situations where cooperation between vehicles can make a significant impact. The VAS project is a collaboration involving academic as well as industrial partners and the final stage of the project is a demonstrator that implements results from the research.
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| 3. |
- Böhm, Annette, et al.
(författare)
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Evaluating CALM M5-based vehicle-to-vehicle communication in various road settings through field trials
- 2010
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Ingår i: Proceedings - Conference on Local Computer Networks, LCN, (2010 12 01): 613-620. - Piscataway, N.J. : IEEE Press. - 9781424483877 ; , s. 613-620
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Konferensbidrag (refereegranskat)abstract
- Future cooperative Intelligent Transport Systems (ITS) applications aimed to improve safety, efficiency and comfort on our roads put high demands on the underlying wireless communication system. To gain better understanding of the limitations of the 5.9 GHz frequency band and the set of communication protocols for medium range vehicle to vehicle (V2V) communication, a set of field trials with CALM M5 enabled prototypes has been conducted. This paper describes five different real vehicle traffic scenarios covering both urban and rural settings at varying vehicle speeds and under varying line-of-sight (LOS) conditions and discusses the connectivity (measured as Packet Reception Ratio) that could be achieved between the two test vehicles. Our measurements indicate a quite problematic LOS sensitivity that strongly influences the performance of V2V-based applications. We further discuss how the awareness of these context-based connectivity problems can be used to improve the design of possible future cooperative ITS safety applications.
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| 4. |
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| 5. |
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| 6. |
- Lidström, Kristoffer, 1981-, et al.
(författare)
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A Modular CACC System Integration Design
- 2012
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Ingår i: IEEE transactions on intelligent transportation systems (Print). - Piscataway : IEEE Press. - 1524-9050 .- 1558-0016. ; 13:3, s. 1050-
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Tidskriftsartikel (refereegranskat)abstract
- This paper describes the Halmstad University entry in the GrCooperative Driving Challenge, which is a competition in vehicle platooning. Cooperative platooning has the potential to improve traffic flow by mitigating shock wave effects, which otherwise may occur in dense traffic. A longitudinal controller that uses information exchanged via wireless communication with other cooperative vehicles to achieve string-stable platooning is developed. The controller is integrated into a production vehicle, together with a positioning system, communication system, human€“machine interface (HMI). A highly modular system architecture enabled rapid development testing of the various subsystems. In the competition, which took place in May 2011 on a closed-off highway in The Netherlands, the Halmstad University team finished second among nine competing teams._x000D_
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| 7. |
- Lidström, Kristoffer, et al.
(författare)
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A Spatial QoS Requirements Specification for V2V Applications
- 2010
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Ingår i: IEEE Intelligent Vehicles Symposium (IV), 2010. - Piscataway, NJ. : IEEE Press. - 9781424478668 ; , s. 548-553
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Konferensbidrag (refereegranskat)abstract
- Vehicle-to-vehicle wireless communication is a key component of tomorrow's cooperative safety applications. However, the wireless link is susceptible to effects such as shadowing which can cause communication failures. Such failures may in turn lead to hazardous traffic situations when safety applications cease to function. By monitoring communication QoS and adapting to changes, effects of link failure may be mitigated, however this requires a specification of the application QoS requirements. In this paper we combine the T-Window reliability QoS metric with a spatial component, allowing us to capture the dependencies between VANET QoS requirements and road geometry. The proposed representation can be used both at design-time, to characterize applications, and at run-time for QoS monitoring and adaptation purposes.
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| 8. |
- Lidström, Kristoffer, et al.
(författare)
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Act normal : using uncertainty about driver intentions as a warning criterion
- 2009
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Ingår i: Proceeding 16th World Congress on Intelligent Transportation Systems.
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Konferensbidrag (refereegranskat)abstract
- Cooperative safety using vehicle-to-vehicle and vehicle-to-infrastructure communication enables warning systems to take into account more detailed and longer range information than previously possible. Due to the increased prediction horizon tactical concepts such as traffic rules and driver intentions must be modelled in addition to short term kinematics traditionally used in driver alert systems. We propose a cooperative warning system that models such concepts using artificial potential fields taking into account multiple route-choice hypotheses. The system is being implemented on the hardware and software platform of the European CVIS project and will be used to evaluate the feasibility of using the history of route-choice estimates as an indicator of unpredictable driver behaviour.
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| 9. |
- Lidström, Kristoffer, et al.
(författare)
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Act normal : Using uncertainty about driver intentions as a warning criterion
- 2009
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Ingår i: Proc. 16th World Congress on Intelligent Transportation Systems. ; , s. 8-
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- Cooperative safety using vehicle-to-vehicle and vehicle-to-infrastructure communication enables warning systems to take into account more detailed and longer range information than previously possible. Due to the increased prediction horizon factors that influence driver behaviour, such as traffic rules and driver intentions, must be modelled in addition to short term kinematics traditionally used in driver alert systems.We propose a cooperative warning system that models such factors using artificial potential fields taking into account multiple hypotheses regarding driver intentions. A prototype has been implemented and has been used to experimentally evaluate the feasibility of using the history of driver intention estimates as an indicator of unpredictable driver behavior.
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| 10. |
- Lidström, Kristoffer, et al.
(författare)
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Cooperative Communication Disturbance Detection in Vehicle Safety Systems
- 2007
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Ingår i: IEEE Intelligent Transportation Systems Conference, 2007. ITSC 2007. - Piscataway, N.J. : IEEE Press. - 9781424413966 ; , s. 522-527
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Konferensbidrag (refereegranskat)abstract
- Proactive vehicle safety systems based on vehicle-to-vehicle and infrastructure-to-vehicle communication are promising new approaches to reducing the number of accidents on our roads. In-vehicle applications are envisaged to provide a variety of services to the driver including warning about potential collisions and other hazardous situations. For the safe operation of these applications it is important not only to efficiently model the environment but also to reason about, and predict, how reliable such a model is under various circumstances. In this paper we propose an approach to estimating the reliability and availability of the wireless medium at hazardous locations by cooperatively detecting communication disturbances in order to allow for more accurate decisions by in-vehicle applications.
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