The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Pietro Manzoni - One of the best experts on this subject based on the ideXlab platform.
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securing warning Message Dissemination in vanets using cooperative neighbor position verification
IEEE Transactions on Vehicular Technology, 2015Co-Authors: Manuel Fogue, Francisco J Martinez, Juancarlos Cano, Carlos T Calafate, Piedad Garrido, Marco Fiore, Carlafabiana Chiasserini, Claudio Casetti, Pietro ManzoniAbstract:Efficient schemes for warning Message Dissemination in vehicular ad hoc networks (VANETs) use context information collected by vehicles about their neighbor nodes to guide the Dissemination process. Based on this information, vehicles autonomously decide whether they are the most appropriate forwarding nodes. These schemes maximize their performance when all the vehicles advertise correct information about their positions, but position errors may drastically reduce the performance of the Dissemination process. We present a proactive cooperative neighbor position verification protocol that detects nodes advertising false locations and selects optimal forwarders to mitigate the impact of adversarial users. We combine our mechanism with two warning Dissemination schemes for VANETs and demonstrate how the latter can benefit from the use of our security scheme in the presence of malicious nodes trying to exploit known system vulnerabilities.
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an adaptive system based on roadmap profiling to enhance warning Message Dissemination in vanets
IEEE ACM Transactions on Networking, 2013Co-Authors: Manuel Fogue, Francisco J Martinez, Juancarlos Cano, Carlos T Calafate, Piedad Garrido, Pietro ManzoniAbstract:In recent years, new applications, architectures, and technologies have been proposed for vehicular ad hoc networks (VANETs). Regarding traffic safety applications for VANETs, warning Messages have to be quickly and smartly disseminated in order to reduce the required Dissemination time and to increase the number of vehicles receiving the traffic warning information. In the past, several approaches have been proposed to improve the alert Dissemination process in multihop wireless networks, but none of them were tested in real urban scenarios, adapting its behavior to the propagation features of the scenario. In this paper, we present the Profile-driven Adaptive Warning Dissemination Scheme (PAWDS) designed to improve the warning Message Dissemination process. With respect to previous proposals, our proposed scheme uses a mapping technique based on adapting the Dissemination strategy according to both the characteristics of the street area where the vehicles are moving and the density of vehicles in the target scenario. Our algorithm reported a noticeable improvement in the performance of alert Dissemination processes in scenarios based on real city maps.
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evaluating the impact of a novel Message Dissemination scheme for vehicular networks using real maps
Transportation Research Part C-emerging Technologies, 2012Co-Authors: Manuel Fogue, Francisco J Martinez, Juancarlos Cano, Carlos T Calafate, Piedad Garrido, Pietro ManzoniAbstract:Abstract In traffic safety applications for vehicular ad hoc networks (VANETs), some warning Messages have to be urgently disseminated in order to increase the number of vehicles receiving the traffic warning information. In those cases, redundancy, contention, and packet collisions due to simultaneous forwarding (usually known as the broadcast storm problem) are prone to occur. In the past, several approaches have been proposed to solve the broadcast storm problem in multi-hop wireless networks such as Mobile ad hoc Networks (MANETs). Among them we can find counter-based, distance-based, location-based, cluster-based, and probabilistic schemes, which have been mainly tested in non-realistic simulation environments. In this paper, we present the enhanced Message Dissemination based on Roadmaps (eMDR), a novel scheme specially designed to increase the percentage of informed vehicles and reduce the notification time; at the same time, it mitigates the broadcast storm problem in real urban scenarios. We evaluate the impact that our scheme has on performance when applied to VANET scenarios based on real city maps, and the results show that it outperforms previous schemes in all situations.
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determining the representative factors affecting warning Message Dissemination in vanets
Wireless Personal Communications, 2012Co-Authors: Francisco J Martinez, Juancarlos Cano, Carlos T Calafate, C K Toh, Pietro ManzoniAbstract:In this paper, we present a statistical analysis based on the 2k factorial methodology to determine the representative factors affecting traffic safety applications in Vehicular ad hoc networks (VANETs). Our purpose is to determine what are the key factors affecting Warning Message Dissemination (WMD) in order to concentrate on such parameters, thus reducing the amount of required simulation time when evaluating VANETs. Simulation results show that the key factors affecting warning Messages delivery are: (i) the transmission range, (ii) the radio propagation model used, and (iii) the density of vehicles. Based on this statistical analysis, we evaluate a compound key factor: neighbor density. This factor combines the above-mentioned factors into a single entity, reducing the number of factors that must be taken into account for VANET researchers to evaluate the benefits of their proposals.
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analysis of the most representative factors affecting warning Message Dissemination in vanets under real roadmaps
Modeling Analysis and Simulation On Computer and Telecommunication Systems, 2011Co-Authors: Manuel Fogue, Francisco J Martinez, Juancarlos Cano, Carlos T Calafate, Piedad Garrido, Pietro ManzoniAbstract:In recent years, new architectures and technologies have been proposed for Vehicular ad hoc networks (VANETs).However, the experiments to validate these proposals tend to overlook the most important and representative factors. Moreover, the scenarios simulated tend to be very simplistic (highways or Manhattan-based layouts), which could seriously affect the validity of the obtained results. In this paper, we present a statistical analysis based on the2k factorial methodology to determine the most representative factors affecting traffic safety applications under real roadmaps. Our purpose is to determine which are the key factors affecting Warning Message Dissemination (WMD) in order to concentrate on such parameters, thus reducing the amount of simulation time required. Simulation results show that the key factors affecting warning Messages delivery are the density of vehicles, and the roadmap used. Based on this statistical analysis, we consider that VANET researchers must evaluate the benefits of their proposals using different vehicle densities and city scenarios.
Mario Gerla - One of the best experts on this subject based on the ideXlab platform.
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reliable safety Message Dissemination in nlos intersections using tv white spectrum
IEEE Transactions on Mobile Computing, 2018Co-Authors: Jaehan Lim, Katsuhiro Naito, Jihoon Yun, Mario GerlaAbstract:Reliable safety Message Dissemination is a fundamental primitive for constructing intersection safety systems. Normally, the Dissemination is based on vehicular communications, of which the de-facto standard is Dedicated Short Range Communications (DSRC). However, due to high frequency operations, a DSRC signal is seriously attenuated when being propagated in Non Line-Of-Sight (NLOS) conditions. Previous schemes leveraged the use of centralized infrastructures or relay vehicles enabling a safety Message to bypass large obstacles. However, implementing the infrastructures in all intersections would be very costly; one may not find proper relay vehicles in low density, and frequent rebroadcasts cause serious network congestion in high density. To address this challenge, we propose a novel scheme that exploits excellent propagation characteristics of a TV White Space (TVWS) band (in addition to a DSRC band) for reliable Dissemination in NLOS intersections. To ensure reliable Dissemination throughout a broad range of densities without infrastructures, our scheme employs two innovative mechanisms: a collaborative procedure and a Dynamic optimal Configuration (DoC). To our knowledge, this is the first that simultaneously satisfies two vital demands for intersection safety system: 1) lacking infrastructures and 2) working well in all densities. Simulation studies show that the proposed scheme outperforms previous infrastructure-based schemes.
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safety Message Dissemination in nlos environments of intersection using tv white space
2015 International Conference on Computing Networking and Communications (ICNC), 2015Co-Authors: Jaehan Lim, Katsuhiro Naito, Jihoon Yun, Danijela Cabric, Mario GerlaAbstract:Safety Message Dissemination is a key mechanism for preventing intersection collisions. Normally, the Dissemination is based on vehicular communications, of which the de-facto standard is Dedicated Short Range Communications (DSRC). However, due to DSRC high operation frequency, a signal suffers from serious attenuation when being propagated in Non Light-Of-Sight (NLOS) conditions. Previous works have leveraged the use of relay units (e.g., repeaters installed on traffic lights) that enabled a safety Message to detour large obstacles. However, one cannot guarantee that vehicles find the relay units at every intersection. To solve this problem, in this paper we propose a novel scheme that enables reliable Dissemination in NLOS conditions by exploiting a TVWS band. Specifically, the proposed scheme leverages the excellent propagation characteristics of a TVWS signal even without relays. To increase the benefit of a TVWS band, the proposed scheme employs an efficient retransmission protocol, the Repetitive Retransmission via Spatial Diversity (RRSD). The above method ensures the safe Message Dissemination even in very harsh NLOS conditions. Moreover, the proposed scheme reduces network congestion via a cluster approach that uses both DSRC and TVWS bands. To the best of our knowledge, this is the first attempt to propose a reliable Dissemination scheme that supports intersection safety services without special relaying units in NLOS conditions. Simulation studies show that the proposed scheme outperforms the previous scheme in the delivery ratio of a safety Message by 25%.
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interplay between tvws and dsrc optimal strategy for safety Message Dissemination in vanet
IEEE Journal on Selected Areas in Communications, 2014Co-Authors: Jaehan Lim, Katsuhiro Naito, Jihoon Yun, Danijela Cabric, Wooseong Kim, Mario GerlaAbstract:In vehicular safety systems, two types of safety Messages are required: Emergency Safety Message (ESM) and Periodic Beacon Message (PBM). The ESM has to be disseminated within a specified area with stringent delay and delivery ratio requirements, while the PBM does not need to meet these requirements. For exchanging the safety Messages in Vehicular Ad-hoc NETwork (VANET), Inter-Vehicle Communication (IVC) is necessary whose de facto standard is Dedicated Short-Range Communications (DSRC). However, the effective transmission range in the DSRC-based IVC is short since a signal can be attenuated due to blocking by obstacles. In order to cover a large Dissemination area in the DSRC-based IVC, multi-hop Dissemination is required, which however causes channel collision and network congestion. Moreover, the coexistence with PBMs aggravates the collision and the congestion, which make it hard to satisfy the requirements of the ESM Dissemination. To overcome the limitation of the DSRC, we utilize an extra TV White Space (TVWS) band that has a large communication range for ESM Disseminations, and exploit a DSRC band for 1) the exchange of control data and 2) the compensation of ESM reception errors. In this paper, we propose and analyze a distributed channel usage framework that exploits advantages of DSRC and TVWS bands for ESM Dissemination under the existence of PBMs. Our scheme employs TVWS Channel Rendezvous Algorithm (TCRA), ensuring that vehicles within a Dissemination area select the same channel with the ESM sender. To compensate ESM reception failures in a TVWS band, our scheme adopts Two-Way Recovery Algorithm (TWRA) that uses DSRC and TVWS bands for ESM retransmission. Further, we establish an analytical delivery ratio model that considers a delay bound of an ESM for optimal parameter selections. To the best of our knowledge, this is the first attempt to propose a distributed channel usage scheme that leverages the strengths of TVWS and DSRC bands for safety Message Dissemination. Through an in-depth simulation study, we show that the proposed scheme satisfies ESM requirements for latency and packet delivery ratio, and outperforms previous approaches in various vehicular scenarios.
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binary partition assisted mac layer broadcast for emergency Message Dissemination in vanets
IEEE Transactions on Intelligent Transportation Systems, 2011Co-Authors: Jagruti Sahoo, Pratap Kumar Sahu, Mario GerlaAbstract:Vehicular ad hoc networks (VANETs) have recently been considered as an attractive network architecture to provide various services ranging from road safety to entertainment applications. In this paper, we propose an IEEE-802.11-based multihop broadcast protocol to address the issue of emergency Message Dissemination in VANETs. The protocol adopts a binary-partition-based approach to repetitively divide the area inside the transmission range to obtain the furthest possible segment. The forwarding duty is then delegated to a vehicle chosen in that segment. Aside from accomplishing directional broadcast for highway scenario, the protocol also exhibits good adaptation to complex road structures. The main focus of the paper lies in reducing broadcast delay, which is an important factor for time-critical safety applications. Most importantly, the contention delay remains almost constant, irrespective of vehicle density. Mathematical analysis is performed to assess the effectiveness of the protocol. Simulation results demonstrate that the proposed protocol imparts greater performance in terms of latency and Message progress when compared with contemporary multihop broadcast protocols for VANETs.
Francisco J Martinez - One of the best experts on this subject based on the ideXlab platform.
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securing warning Message Dissemination in vanets using cooperative neighbor position verification
IEEE Transactions on Vehicular Technology, 2015Co-Authors: Manuel Fogue, Francisco J Martinez, Juancarlos Cano, Carlos T Calafate, Piedad Garrido, Marco Fiore, Carlafabiana Chiasserini, Claudio Casetti, Pietro ManzoniAbstract:Efficient schemes for warning Message Dissemination in vehicular ad hoc networks (VANETs) use context information collected by vehicles about their neighbor nodes to guide the Dissemination process. Based on this information, vehicles autonomously decide whether they are the most appropriate forwarding nodes. These schemes maximize their performance when all the vehicles advertise correct information about their positions, but position errors may drastically reduce the performance of the Dissemination process. We present a proactive cooperative neighbor position verification protocol that detects nodes advertising false locations and selects optimal forwarders to mitigate the impact of adversarial users. We combine our mechanism with two warning Dissemination schemes for VANETs and demonstrate how the latter can benefit from the use of our security scheme in the presence of malicious nodes trying to exploit known system vulnerabilities.
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broadcast Message Dissemination schemes for urban environments a survey
한국산업정보학회 학술대회논문집, 2014Co-Authors: Julio A Sanguesa, Francisco J Martinez, Juancarlos Cano, Manuel Fogue, Piedad Garrido, Carlos T CalafateAbstract:In VANKT traffic safety applications, efficient warning Message Dissemination is required. The main goal is to reduce the latency while ensuring the correct reception of warning information by nearby vehicles when a dangerous situation occurs. So far, several Dissemination schemes have been proposed and evaluated under different conditions, and using different simulators, making it difficult to determine which is the optimal Dissemination scheme. In this paper, we assess the performance of several existing broadcast Dissemination schemes by evaluating them under the same conditions, and focusing on the same metrics, thus providing researchers with a general overview of the drawbacks and benefits associated to each scheme.
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an adaptive system based on roadmap profiling to enhance warning Message Dissemination in vanets
IEEE ACM Transactions on Networking, 2013Co-Authors: Manuel Fogue, Francisco J Martinez, Juancarlos Cano, Carlos T Calafate, Piedad Garrido, Pietro ManzoniAbstract:In recent years, new applications, architectures, and technologies have been proposed for vehicular ad hoc networks (VANETs). Regarding traffic safety applications for VANETs, warning Messages have to be quickly and smartly disseminated in order to reduce the required Dissemination time and to increase the number of vehicles receiving the traffic warning information. In the past, several approaches have been proposed to improve the alert Dissemination process in multihop wireless networks, but none of them were tested in real urban scenarios, adapting its behavior to the propagation features of the scenario. In this paper, we present the Profile-driven Adaptive Warning Dissemination Scheme (PAWDS) designed to improve the warning Message Dissemination process. With respect to previous proposals, our proposed scheme uses a mapping technique based on adapting the Dissemination strategy according to both the characteristics of the street area where the vehicles are moving and the density of vehicles in the target scenario. Our algorithm reported a noticeable improvement in the performance of alert Dissemination processes in scenarios based on real city maps.
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evaluating the impact of a novel Message Dissemination scheme for vehicular networks using real maps
Transportation Research Part C-emerging Technologies, 2012Co-Authors: Manuel Fogue, Francisco J Martinez, Juancarlos Cano, Carlos T Calafate, Piedad Garrido, Pietro ManzoniAbstract:Abstract In traffic safety applications for vehicular ad hoc networks (VANETs), some warning Messages have to be urgently disseminated in order to increase the number of vehicles receiving the traffic warning information. In those cases, redundancy, contention, and packet collisions due to simultaneous forwarding (usually known as the broadcast storm problem) are prone to occur. In the past, several approaches have been proposed to solve the broadcast storm problem in multi-hop wireless networks such as Mobile ad hoc Networks (MANETs). Among them we can find counter-based, distance-based, location-based, cluster-based, and probabilistic schemes, which have been mainly tested in non-realistic simulation environments. In this paper, we present the enhanced Message Dissemination based on Roadmaps (eMDR), a novel scheme specially designed to increase the percentage of informed vehicles and reduce the notification time; at the same time, it mitigates the broadcast storm problem in real urban scenarios. We evaluate the impact that our scheme has on performance when applied to VANET scenarios based on real city maps, and the results show that it outperforms previous schemes in all situations.
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determining the representative factors affecting warning Message Dissemination in vanets
Wireless Personal Communications, 2012Co-Authors: Francisco J Martinez, Juancarlos Cano, Carlos T Calafate, C K Toh, Pietro ManzoniAbstract:In this paper, we present a statistical analysis based on the 2k factorial methodology to determine the representative factors affecting traffic safety applications in Vehicular ad hoc networks (VANETs). Our purpose is to determine what are the key factors affecting Warning Message Dissemination (WMD) in order to concentrate on such parameters, thus reducing the amount of required simulation time when evaluating VANETs. Simulation results show that the key factors affecting warning Messages delivery are: (i) the transmission range, (ii) the radio propagation model used, and (iii) the density of vehicles. Based on this statistical analysis, we evaluate a compound key factor: neighbor density. This factor combines the above-mentioned factors into a single entity, reducing the number of factors that must be taken into account for VANET researchers to evaluate the benefits of their proposals.
Carlos T Calafate - One of the best experts on this subject based on the ideXlab platform.
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securing warning Message Dissemination in vanets using cooperative neighbor position verification
IEEE Transactions on Vehicular Technology, 2015Co-Authors: Manuel Fogue, Francisco J Martinez, Juancarlos Cano, Carlos T Calafate, Piedad Garrido, Marco Fiore, Carlafabiana Chiasserini, Claudio Casetti, Pietro ManzoniAbstract:Efficient schemes for warning Message Dissemination in vehicular ad hoc networks (VANETs) use context information collected by vehicles about their neighbor nodes to guide the Dissemination process. Based on this information, vehicles autonomously decide whether they are the most appropriate forwarding nodes. These schemes maximize their performance when all the vehicles advertise correct information about their positions, but position errors may drastically reduce the performance of the Dissemination process. We present a proactive cooperative neighbor position verification protocol that detects nodes advertising false locations and selects optimal forwarders to mitigate the impact of adversarial users. We combine our mechanism with two warning Dissemination schemes for VANETs and demonstrate how the latter can benefit from the use of our security scheme in the presence of malicious nodes trying to exploit known system vulnerabilities.
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broadcast Message Dissemination schemes for urban environments a survey
한국산업정보학회 학술대회논문집, 2014Co-Authors: Julio A Sanguesa, Francisco J Martinez, Juancarlos Cano, Manuel Fogue, Piedad Garrido, Carlos T CalafateAbstract:In VANKT traffic safety applications, efficient warning Message Dissemination is required. The main goal is to reduce the latency while ensuring the correct reception of warning information by nearby vehicles when a dangerous situation occurs. So far, several Dissemination schemes have been proposed and evaluated under different conditions, and using different simulators, making it difficult to determine which is the optimal Dissemination scheme. In this paper, we assess the performance of several existing broadcast Dissemination schemes by evaluating them under the same conditions, and focusing on the same metrics, thus providing researchers with a general overview of the drawbacks and benefits associated to each scheme.
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an adaptive system based on roadmap profiling to enhance warning Message Dissemination in vanets
IEEE ACM Transactions on Networking, 2013Co-Authors: Manuel Fogue, Francisco J Martinez, Juancarlos Cano, Carlos T Calafate, Piedad Garrido, Pietro ManzoniAbstract:In recent years, new applications, architectures, and technologies have been proposed for vehicular ad hoc networks (VANETs). Regarding traffic safety applications for VANETs, warning Messages have to be quickly and smartly disseminated in order to reduce the required Dissemination time and to increase the number of vehicles receiving the traffic warning information. In the past, several approaches have been proposed to improve the alert Dissemination process in multihop wireless networks, but none of them were tested in real urban scenarios, adapting its behavior to the propagation features of the scenario. In this paper, we present the Profile-driven Adaptive Warning Dissemination Scheme (PAWDS) designed to improve the warning Message Dissemination process. With respect to previous proposals, our proposed scheme uses a mapping technique based on adapting the Dissemination strategy according to both the characteristics of the street area where the vehicles are moving and the density of vehicles in the target scenario. Our algorithm reported a noticeable improvement in the performance of alert Dissemination processes in scenarios based on real city maps.
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evaluating the impact of a novel Message Dissemination scheme for vehicular networks using real maps
Transportation Research Part C-emerging Technologies, 2012Co-Authors: Manuel Fogue, Francisco J Martinez, Juancarlos Cano, Carlos T Calafate, Piedad Garrido, Pietro ManzoniAbstract:Abstract In traffic safety applications for vehicular ad hoc networks (VANETs), some warning Messages have to be urgently disseminated in order to increase the number of vehicles receiving the traffic warning information. In those cases, redundancy, contention, and packet collisions due to simultaneous forwarding (usually known as the broadcast storm problem) are prone to occur. In the past, several approaches have been proposed to solve the broadcast storm problem in multi-hop wireless networks such as Mobile ad hoc Networks (MANETs). Among them we can find counter-based, distance-based, location-based, cluster-based, and probabilistic schemes, which have been mainly tested in non-realistic simulation environments. In this paper, we present the enhanced Message Dissemination based on Roadmaps (eMDR), a novel scheme specially designed to increase the percentage of informed vehicles and reduce the notification time; at the same time, it mitigates the broadcast storm problem in real urban scenarios. We evaluate the impact that our scheme has on performance when applied to VANET scenarios based on real city maps, and the results show that it outperforms previous schemes in all situations.
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determining the representative factors affecting warning Message Dissemination in vanets
Wireless Personal Communications, 2012Co-Authors: Francisco J Martinez, Juancarlos Cano, Carlos T Calafate, C K Toh, Pietro ManzoniAbstract:In this paper, we present a statistical analysis based on the 2k factorial methodology to determine the representative factors affecting traffic safety applications in Vehicular ad hoc networks (VANETs). Our purpose is to determine what are the key factors affecting Warning Message Dissemination (WMD) in order to concentrate on such parameters, thus reducing the amount of required simulation time when evaluating VANETs. Simulation results show that the key factors affecting warning Messages delivery are: (i) the transmission range, (ii) the radio propagation model used, and (iii) the density of vehicles. Based on this statistical analysis, we evaluate a compound key factor: neighbor density. This factor combines the above-mentioned factors into a single entity, reducing the number of factors that must be taken into account for VANET researchers to evaluate the benefits of their proposals.
Juancarlos Cano - One of the best experts on this subject based on the ideXlab platform.
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securing warning Message Dissemination in vanets using cooperative neighbor position verification
IEEE Transactions on Vehicular Technology, 2015Co-Authors: Manuel Fogue, Francisco J Martinez, Juancarlos Cano, Carlos T Calafate, Piedad Garrido, Marco Fiore, Carlafabiana Chiasserini, Claudio Casetti, Pietro ManzoniAbstract:Efficient schemes for warning Message Dissemination in vehicular ad hoc networks (VANETs) use context information collected by vehicles about their neighbor nodes to guide the Dissemination process. Based on this information, vehicles autonomously decide whether they are the most appropriate forwarding nodes. These schemes maximize their performance when all the vehicles advertise correct information about their positions, but position errors may drastically reduce the performance of the Dissemination process. We present a proactive cooperative neighbor position verification protocol that detects nodes advertising false locations and selects optimal forwarders to mitigate the impact of adversarial users. We combine our mechanism with two warning Dissemination schemes for VANETs and demonstrate how the latter can benefit from the use of our security scheme in the presence of malicious nodes trying to exploit known system vulnerabilities.
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broadcast Message Dissemination schemes for urban environments a survey
한국산업정보학회 학술대회논문집, 2014Co-Authors: Julio A Sanguesa, Francisco J Martinez, Juancarlos Cano, Manuel Fogue, Piedad Garrido, Carlos T CalafateAbstract:In VANKT traffic safety applications, efficient warning Message Dissemination is required. The main goal is to reduce the latency while ensuring the correct reception of warning information by nearby vehicles when a dangerous situation occurs. So far, several Dissemination schemes have been proposed and evaluated under different conditions, and using different simulators, making it difficult to determine which is the optimal Dissemination scheme. In this paper, we assess the performance of several existing broadcast Dissemination schemes by evaluating them under the same conditions, and focusing on the same metrics, thus providing researchers with a general overview of the drawbacks and benefits associated to each scheme.
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an adaptive system based on roadmap profiling to enhance warning Message Dissemination in vanets
IEEE ACM Transactions on Networking, 2013Co-Authors: Manuel Fogue, Francisco J Martinez, Juancarlos Cano, Carlos T Calafate, Piedad Garrido, Pietro ManzoniAbstract:In recent years, new applications, architectures, and technologies have been proposed for vehicular ad hoc networks (VANETs). Regarding traffic safety applications for VANETs, warning Messages have to be quickly and smartly disseminated in order to reduce the required Dissemination time and to increase the number of vehicles receiving the traffic warning information. In the past, several approaches have been proposed to improve the alert Dissemination process in multihop wireless networks, but none of them were tested in real urban scenarios, adapting its behavior to the propagation features of the scenario. In this paper, we present the Profile-driven Adaptive Warning Dissemination Scheme (PAWDS) designed to improve the warning Message Dissemination process. With respect to previous proposals, our proposed scheme uses a mapping technique based on adapting the Dissemination strategy according to both the characteristics of the street area where the vehicles are moving and the density of vehicles in the target scenario. Our algorithm reported a noticeable improvement in the performance of alert Dissemination processes in scenarios based on real city maps.
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evaluating the impact of a novel Message Dissemination scheme for vehicular networks using real maps
Transportation Research Part C-emerging Technologies, 2012Co-Authors: Manuel Fogue, Francisco J Martinez, Juancarlos Cano, Carlos T Calafate, Piedad Garrido, Pietro ManzoniAbstract:Abstract In traffic safety applications for vehicular ad hoc networks (VANETs), some warning Messages have to be urgently disseminated in order to increase the number of vehicles receiving the traffic warning information. In those cases, redundancy, contention, and packet collisions due to simultaneous forwarding (usually known as the broadcast storm problem) are prone to occur. In the past, several approaches have been proposed to solve the broadcast storm problem in multi-hop wireless networks such as Mobile ad hoc Networks (MANETs). Among them we can find counter-based, distance-based, location-based, cluster-based, and probabilistic schemes, which have been mainly tested in non-realistic simulation environments. In this paper, we present the enhanced Message Dissemination based on Roadmaps (eMDR), a novel scheme specially designed to increase the percentage of informed vehicles and reduce the notification time; at the same time, it mitigates the broadcast storm problem in real urban scenarios. We evaluate the impact that our scheme has on performance when applied to VANET scenarios based on real city maps, and the results show that it outperforms previous schemes in all situations.
-
determining the representative factors affecting warning Message Dissemination in vanets
Wireless Personal Communications, 2012Co-Authors: Francisco J Martinez, Juancarlos Cano, Carlos T Calafate, C K Toh, Pietro ManzoniAbstract:In this paper, we present a statistical analysis based on the 2k factorial methodology to determine the representative factors affecting traffic safety applications in Vehicular ad hoc networks (VANETs). Our purpose is to determine what are the key factors affecting Warning Message Dissemination (WMD) in order to concentrate on such parameters, thus reducing the amount of required simulation time when evaluating VANETs. Simulation results show that the key factors affecting warning Messages delivery are: (i) the transmission range, (ii) the radio propagation model used, and (iii) the density of vehicles. Based on this statistical analysis, we evaluate a compound key factor: neighbor density. This factor combines the above-mentioned factors into a single entity, reducing the number of factors that must be taken into account for VANET researchers to evaluate the benefits of their proposals.
