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  • Understanding, modeling and taming mobile malware epidemics in a large-scale vehicular network

     Trullols Cruces, Oscar; Fiore, Marco; Barcelò Ordinas, José María
    IEEE International Symposium on a World of Wireless, Mobile and Multimedia Networks
    Presentation's date: 2013-07
    Presentation of work at congresses

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    The large-scale adoption of vehicle-to-vehicle (V2V) communication technologies risks to significantly widen the attack surface available to mobile malware targeting critical automobile operations. Given that outbreaks of vehicular computer worms self-propagating through V2V links could pose a significant threat to road traffic safety, it is important to understand the dynamics of such epidemics and to prepare adequate countermeasures. In this paper we perform a comprehensive characterization of the infection process of variously behaving vehicular worms on a road traffic scenario of unprecedented scale and heterogeneity. We then propose a simple yet effective data-driven model of the worm epidemics, and we show how it can be leveraged for smart patching infected vehicles through the cellular network in presence of a vehicular worm outbreak.

    The large-scale adoption of vehicle-to-vehicle (V2V) communication technologies risks to significantly widen the attack surface available to mobile malware targeting critical automobile operations. Given that outbreaks of vehicular computer worms self-propagating through V2V links could pose a significant threat to road traffic safety, it is important to understand the dynamics of such epidemics and to prepare adequate countermeasures. In this paper we perform a comprehensive characterization of the infection process of variously behaving vehicular worms on a road traffic scenario of unprecedented scale and heterogeneity. We then propose a simple yet effective data-driven model of the worm epidemics, and we show how it can be leveraged for smart patching infected vehicles through the cellular network in presence of a vehicular worm outbreak.

  • RSU deployment for content dissemination and downloading in intelligent transportation systems

     Reineri, Massimo; Casetti, Claudio; Chiasserini, Carla-Fabiana; Fiore, Marco; Trullols Cruces, Oscar; Barcelò Ordinas, José María
    Date of publication: 2012-10-01
    Book chapter

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  • Cooperative download in vehicular environments

     Trullols Cruces, Oscar; Fiore, Marco; Barcelò Ordinas, José María
    IEEE transactions on mobile computing
    Date of publication: 2012-04
    Journal article

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  • Power saving trade-offs in delay/disruptive tolerant networks

     Trullols Cruces, Oscar; Morillo Pozo, Julian David; Barcelò Ordinas, José María; Garcia Vidal, Jorge
    IEEE International Symposium on a World of Wireless, Mobile and Multimedia Networks
    Presentation of work at congresses

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    Wireless nodes such as smart-phones in which the WiFi wireless card is continuously on, consume battery energy in just a few hours. Moreover, in many scenarios, an always-on wireless card is useless because there is often no need for transmission and/or reception. This fact is exacerbated in Delay/Disruptive Tolerant Network (DTN) environments, in which nodes exchange Delay Tolerant Objects (DTO) when they meet. Power Saving Management (PSM) techniques enable the lifetime of the nodes to be extended. This paper analyses the trade-offs that appear when wireless nodes periodically turn off the wireless card in order to save battery in DTN environments. The paper shows the conditions in which a node can switch off the battery without impacting the peer-to-peer contact probability, and those in which this contact probability is decreased. For example, it is shown that node lifetime can be doubled while keeping the peer-to-peer contact probability equal to one. But, further increase of the node lifetime quickly decreases peer-to-peer contact probability. Finally, the impact of power savings in DTO dissemination time is also analyzed.

  • VANET mobility modeling challenged by feedback loops

     Meyer, Harald; Trullols Cruces, Oscar; Hess, Andrea; Hummel, Karin Anna; Barcelò Ordinas, José María; Casetti, Claudio; Karlsson, Gunnar
    IEEE IFIP Annual Mediterranean Ad Hoc Networking Workshop
    Presentation of work at congresses

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    VANET applications are often providing street traffic information to vehicles and drivers, regarding, for instance, traffic conditions and parking space availability. This information influences in turn the driving behavior in real-world settings. Mobility models used in current VANET simulations are mostly ignoring this feedback entirely. In cases the feedback is included, it is mainly based on ad-hoc approaches with lack of generality. With this paper, we contribute to the investigation of such feedback loops within VANETs by describing the levels at which feedback loops can be introduced, i.e., on strategic, tactical, and operational levels of mobility. We further describe how feedback loops can be introduced in arbitrary mobility models and in particular in elementary mobility models. We exemplify our approach by introducing two types of feedback loops for the Manhattan Mobility model, the Random Trip model, and the Constrained Random Trip model. One feedback loop represents points of interest attracting vehicles, such as free parking spaces attracting vehicles searching for parking. The other feedback loop focuses on repelling vehicles, such as a traffic jam. We discuss the impacts of the feedback in terms of the mobility metrics: vehicle density per area, number of direction changes, and intensity of direction changes. Furthermore, we discuss the effects in terms of information availability and delays of transmission in an opportunistic vehicular network.

  • Impact of the infrastructure in mobile opportunistic networks

     Trullols Cruces, Oscar; Morillo Pozo, Julian David; Barcelò Ordinas, José María
    International Symposium on Applied Sciences in Biomedical and Communication Technologies
    Presentation's date: 2011
    Presentation of work at congresses

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    Epidemic modeling has been used to analyze many disciplines such as biology, ecology and medicine. In the last years, it also has been applied to networking paradigms such as social networks, virus spreading in Internet and lastly to opportunistic networking in mobile networks. In this paper we revise some of the facts of epidemic modeling in mobile networks and use these models to analyze the impact of adding infrastructure to sparse opportunistic mobile networks. We show how the position in which infrastructure is placed takes an important impact in the dissemination delay.

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    Exact decoding probability under random linear network coding  Open access

     Trullols Cruces, Oscar; Barcelò Ordinas, José María; Fiore, Marco
    IEEE communications letters
    Date of publication: 2011-01
    Journal article

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    In this letter, we compute the exact probability that a receiver obtains N linearly independent packets among K ≥ N received packets, when the sender/s use/s random linear network coding over a Galois Field of size q. Such condition maps to the receiver's capability to decode the original information, and its mathematical characterization helps to design the coding so to guarantee the correctness of the transmission. Our formulation represents an improvement over the current upper bound for the decoding probability, and provides theoretical grounding to simulative results in the literature.

  • Planning Roadside Infrastructure for Information Dissemination in Intelligent Transportation Systems

     Trullols Cruces, Oscar; Fiore, Marco; Casetti, Claudio; Chiasserini, Carla-Fabiana; Barcelò Ordinas, José María
    Computer communications
    Date of publication: 2010-06-01
    Journal article

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    A Max coverage formulation for information dissemination in vehicular networks  Open access

     Trullols Cruces, Oscar; Barcelò Ordinas, José María; Fiore, Marco; Casetti, Claudio; Chiasserini, Carla-Fabiana
    IEEE International Conference on Wireless and Mobile Computing, Networking and Communications
    Presentation's date: 2009-10-14
    Presentation of work at congresses

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    We consider that a given number of Dissemination Points (DPs) have to be deployed for disseminating information to vehicles travelling in an urban area. We formulate our problem as a Maximum Coverage Problem (MCP) so as to maximize the number of vehicles that get in contact with the DPs and as a second step with a sufficient amount of time. Since the MCP is NP-hard, we solve it though heuristic algorithms. Evaluation of the proposed solutions in a realistic urban environment shows how knowledge of vehicular mobility plays a major role in achieving an optimal coverage of mobile users, and that simple heuristics provide near-optimal results even in large-scale scenarios.

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    A cooperative vehicular network framework  Open access

     Trullols Cruces, Oscar; Morillo Pozo, Julian David; Barcelò Ordinas, José María; Garcia Vidal, Jorge
    IEEE International Conference on Communications
    Presentation's date: 2009-06-17
    Presentation of work at congresses

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    Vehicular Ad Hoc Networks are networks characterized by intermittent connectivity and rapid changes in their topology. This paper addresses car-to-road communications in which vehicles use Access Points (AP) in a Delay Tolerant Network architecture. Results show how the combination of a Delay-Cooperative ARQ mechanism reduces packet losses and in conjunction with a Carry-and-Forward cooperative mechanism improves performance parameters in terms of total file transfer delay and number of AP needed to download files.

  • XARXES DE COMPUTADORS I SISTEMES DISTRIBUÏTS

     Navarro Moldes, Leandro; Guerrero Zapata, Manel; Barcelò Ordinas, José María; Morillo Pozo, Julian David; Cerdà Alabern, Llorenç; Trullols Cruces, Oscar; Garcia Vidal, Jorge
    Participation in a competitive project

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    Information dissemination in VANETs: deployment strategies for maximizing coverage  Open access

     Trullols Cruces, Oscar; Barcelò Ordinas, José María; Fiore, Marco; Casetti, Claudio; Chiasserini, Carla-Fabiana
    Euro-NF Workshop on Wireless and Mobility
    Presentation's date: 2009-09-22
    Presentation of work at congresses

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    We consider that a given number of Dissemination Points (DPs) have to be deployed for disseminating information to vehicles travelling in an urban area. We formulate our problem as a Maximum Coverage Problem (MCP) so as to maximize the number of vehicles that get in contact with the DPs. Since the MCP is NP-hard, we solve it though heuristic algorithms. Evaluation of the proposed solutions in a realistic urban environment shows how knowledge of vehicular mobility plays a major role in achieving an optimal coverage of mobile users, and that simple heuristics provide near-optimal results even in large-scale scenarios.

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    Evaluation of a cooperative ARQ protocol for delay-tolerant vehicular networks  Open access

     Morillo Pozo, Julian David; Trullols Cruces, Oscar; Barcelò Ordinas, José María; Garcia Vidal, Jorge
    Date of publication: 2008-10-16
    Book chapter

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    This paper evaluates a Cooperative ARQ protocol to be used in delay-tolerant vehicular networks. The scenario consists in cars downloading information from Access Points along a road. The key difference between proposed Cooperative ARQ protocols is when the cooperation takes place. Simply C-ARQ cooperation occurs in a packet-by-packet basis. In this proposal, that we call DC-ARQ (Delayed Cooperative ARQ), the cooperation is delayed until cars are out of the coverage area of the Access Point. The scheme has been evaluated through simulations. A comparison of DC-ARQ with a baseline case in which no cooperation is used has been performed under different vehicle densities scenarios.

    Postprint (author’s final draft)

  • TSI2007-66869-C02-01 "Integración de Redes Ad Hoc, Mesh y Celulares"

     Garcia Vidal, Jorge; Guerrero Zapata, Manel; Barcelò Ordinas, José María; Morillo Pozo, Julian David; Cerdà Alabern, Llorenç; Alaei, Mohammad; Fusté Vilella, David; Trullols Cruces, Oscar
    Participation in a competitive project

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  • New networking paradigms applied to vehicular ad hoc networks

     Trullols Cruces, Oscar; Morillo Pozo, Julian David; Barcelò Ordinas, José María; Garcia Vidal, Jorge
    EuroNF Workshop on Wireless and Mobility
    Presentation's date: 2008-10-24
    Presentation of work at congresses

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  • Applying cooperation for delay tolerant vehicular networks

     Morillo Pozo, Julian David; Barcelò Ordinas, José María; Trullols Cruces, Oscar; Garcia Vidal, Jorge
    EuroFGI Workshop on Wireless and Mobility
    Presentation's date: 2008-01-16
    Presentation of work at congresses

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  • A cooperative ARQ for delay-tolerant vehicular networks

     Morillo Pozo, Julian David; Trullols Cruces, Oscar; Barcelò Ordinas, José María; Garcia Vidal, Jorge
    International Conference on Distributed Computing Systems
    Presentation's date: 2008-06-20
    Presentation of work at congresses

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