Proceedings of the ninth ACM international workshop on Vehicular inter-networking, systems, and applications最新文献

{"title":"MoViT: the mobile network virtualized testbed","authors":"E. Giordano, Lara Codecà, Brian Geffon, Giulio Grassi, G. Pau, M. Gerla","doi":"10.1145/2307888.2307892","DOIUrl":"https://doi.org/10.1145/2307888.2307892","url":null,"abstract":"MoViT is a distributed software suite for the emulation of mobile wireless networks. MoViT provides researchers and developers with a virtualized environment for developing and testing mobile applications and protocols for any hardware and software platform that can be virtualized. The distributed nature of MoViT allows for the emulation of mobile networks of arbitrary size. Additionally, the network connectivity is shaped transparently such that the connectivity observed by each virtual node resembles that of a physical mobile network. In this paper we present the MoViT architecture, the models used to emulate the wireless channel, the details of our initial implementation and, finally, the results of our evaluation regarding the scalability, realism, and versatility of MoViT.","PeriodicalId":360427,"journal":{"name":"Proceedings of the ninth ACM international workshop on Vehicular inter-networking, systems, and applications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127385434","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Session details: Poster session","authors":"F. Kargl","doi":"10.1145/3253527","DOIUrl":"https://doi.org/10.1145/3253527","url":null,"abstract":"","PeriodicalId":360427,"journal":{"name":"Proceedings of the ninth ACM international workshop on Vehicular inter-networking, systems, and applications","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126817696","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A novel use of EDCA to improve vehicle safety communication","authors":"Sarah Sharafkandi, G. Bansal, J. Kenney, D. Du","doi":"10.1145/2307888.2307910","DOIUrl":"https://doi.org/10.1145/2307888.2307910","url":null,"abstract":"This paper addresses the problem of using standard EDCA to minimize frame collisions among periodic vehicle safety messages. We make two principal contributions. First we demonstrate an Access Category (AC) isolation technique that dramatically reduces the collision probability of high priority packets in dense environments. Second we introduce a novel concept called virtual division by which significant reductions in collisions among lower priority packets can be achieved. AC isolation and virtual division are conformant with IEEE 802.11p and can be supported by existing integrated circuit implementations, but to the authors' knowledge neither has been published before. These techniques are motivated by the periodic safety message environment under development in the US, Europe and parts of Asia, but they may have applicability for other vehicular applications or more general WiFi networks. The results in this paper are verified via extensive NS-2 simulations.","PeriodicalId":360427,"journal":{"name":"Proceedings of the ninth ACM international workshop on Vehicular inter-networking, systems, and applications","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116622986","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Experimental evaluation of cooperative active safety applications based on V2V communications","authors":"M. Sepulcre, J. Gozálvez","doi":"10.1145/2307888.2307893","DOIUrl":"https://doi.org/10.1145/2307888.2307893","url":null,"abstract":"Cooperative vehicular systems are expected to improve traffic safety and efficiency through the real-time exchange of information between vehicles and infrastructure nodes. To this aim, cooperative active safety applications are being designed to extend, in space and time, the drivers' awareness of the surrounding environment in order to be able to detect potential road dangers with sufficient time for the driver to react. The strict requirements of cooperative vehicular applications and the challenging vehicular environment require that cooperative active safety applications are extensively tested under real-world conditions. In this context, this paper presents the experimental evaluation of different vehicle-to-vehicle cooperative active safety applications under real world and challenging conditions where cooperative systems need to prove their real effectiveness.","PeriodicalId":360427,"journal":{"name":"Proceedings of the ninth ACM international workshop on Vehicular inter-networking, systems, and applications","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116798572","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Exploiting beacons for scalable broadcast data dissemination in VANETs","authors":"Ramon S. Schwartz, Kallol Das, H. Scholten, P. Havinga","doi":"10.1145/2307888.2307899","DOIUrl":"https://doi.org/10.1145/2307888.2307899","url":null,"abstract":"Vehicular Ad-hoc Networks (VANETs) enable the timely broadcast dissemination of event-driven messages to interested vehicles. However, when dealing with broadcast communication, suppression techniques must be designed to prevent the so-called broadcast storm problem. Numerous suppression schemes aim to reduce broadcast redundancy by assigning vehicles to different delay values, i.e., time slots, that are inversely proportional to their distance to the sender. In this way, only the farthest vehicles would rebroadcast, thereby allowing for quick data dissemination. Despite many efforts, current delay-based schemes still suffer from high levels of contention and collision when the number of vehicles rebroadcasting nearly simultaneously is high in dense networks. Even choosing appropriate values for the total number of time slots does not prevent situations where simply no vehicle is assigned to the earliest time slot, what may result in high end-to-end delay. In this paper, we tackle such scalability issues with a scheme that controls with precision the density of vehicles within each time slot. To reach this goal, we exploit the presence of beacons, periodic messages meant to provide cooperative awareness in safety applications. Simulations results show that our protocol outperforms existing delay-based schemes and is able to disseminate data messages in a scalable, timely, and robust manner.","PeriodicalId":360427,"journal":{"name":"Proceedings of the ninth ACM international workshop on Vehicular inter-networking, systems, and applications","volume":"362 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115957703","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"In VANETs we trust?: characterizing RF jamming in vehicular networks","authors":"Oscar Puñal, Ana Aguiar, J. Gross","doi":"10.1145/2307888.2307903","DOIUrl":"https://doi.org/10.1145/2307888.2307903","url":null,"abstract":"In this paper we study the impact of RF jamming on 802.11p car-to-car communications. We build a jammer on a software defined radio and implement constant, reactive and pilot jamming patterns, whose effectiveness is first measured in an anechoic chamber. We perform extensive experiments in two relevant outdoor scenarios, namely a straight road in an open space as well as a dense building scenario with a crossroad and characterize the performance of 802.11p communications under the impact of constant and reactive RF jamming. The constant jammer is able to dramatically disrupt communication regardless of the scenario. The reactive jammer exhibits a low impact in scenarios with reduced line-of-sight as its jamming success greatly depends on the relative position of the nodes. It is, however, very effective in open-space scenarios. In general, we observe that RF jamming can cause large communication-blind areas. Under these conditions, critical safety applications would simply fail in their purpose of timely warning dissemination.","PeriodicalId":360427,"journal":{"name":"Proceedings of the ninth ACM international workshop on Vehicular inter-networking, systems, and applications","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130265421","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Session details: Protocol design and analysis","authors":"G. Pau","doi":"10.1145/3253525","DOIUrl":"https://doi.org/10.1145/3253525","url":null,"abstract":"","PeriodicalId":360427,"journal":{"name":"Proceedings of the ninth ACM international workshop on Vehicular inter-networking, systems, and applications","volume":"783 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133182810","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Congestion control for vehicular safety: synchronous and asynchronous MAC algorithms","authors":"Sundar Subramanian, M. Werner, Shihuan Liu, J. Jose, Radu Lupoaie, Xinzhou Wu","doi":"10.1145/2307888.2307900","DOIUrl":"https://doi.org/10.1145/2307888.2307900","url":null,"abstract":"The IEEE 802.11p standard specifies the PHY and MAC layer operations for transmitting and receiving periodic broadcast messages for vehicular safety. Many studies have identified issues with the CSMA based IEEE 802.11p MAC at high densities of devices, mainly reflected by low packet reception rate. In this paper, we make an interesting observation that with increasing density, the IEEE 802.11p MAC tends towards an ALOHA-type behavior where concurrent transmissions by close-by devices are not prevented. This behavior can lead to poor packet reception rate even for vehicles in close neighborhood. Many efforts have been made to address the IEEE 802.11p MAC issues to provide better performance for DSRC safety applications, including the introduction of Decentralized Congestion Control (DCC) algorithm to ETSI standards in Europe. In this paper, we evaluate the performance of the proposed DCC algorithm and observe that the nominal parameters in DCC are unsuitable in many scenarios. Using transmit power control as an example, we develop a simple rule within the DCC framework that can significantly improve the safety packet reception performance with increasing densities. The DCC algorithms are fully compatible with the IEEE 802.11p standards and asynchronous in nature. A parallel approach to handle high device densities is a slotted synchronous MAC, where time is slotted based on GPS synchronization and each transmitter contends for a set of recurring time slots (or channels) with periodicity matching the required safety message periodicity. As compared to the per-packet based contention scheme as in CSMA defined in IEEE 802.11, such a scheme is much better suited for periodic safety broadcast. In this paper, we design a standard compliant TDM overlay on top of the MAC layer that can significantly improve the packet reception performance. Combined with a distributed resource selection protocol, the synchronous MAC can discover even more neighboring devices than the improved asynchronous approach, making DSRC safety applications more reliable.","PeriodicalId":360427,"journal":{"name":"Proceedings of the ninth ACM international workshop on Vehicular inter-networking, systems, and applications","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130757895","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Comparing apples and oranges?: trends in IVC simulations","authors":"Stefan Joerer, F. Dressler, C. Sommer","doi":"10.1145/2307888.2307895","DOIUrl":"https://doi.org/10.1145/2307888.2307895","url":null,"abstract":"Looking back at recent years in Inter-Vehicle Communication (IVC) research, tremendous improvements in precision and realism of simulation models concerning all its aspects can be observed. These models offer a vast number of parameters, enabling investigations of a huge variety of different scenarios. Reviewing simulation studies published at major vehicular network conferences from 2009 to 2011, we reflect on the impact of these developments. We are glad to present a clear trend to conduct simulations based on a consolidated set of established standards, models, and tools. However, looking at individual papers, we commonly find key information (such as the used model) missing. We argue that this trend threatens to compromise both the reproducibility and the comparability of simulations conducted, but acknowledge that space constraints often make it impossible to describe current, complex simulations in full. We hope that the presented commonly used basic building blocks of simulations can serve as first step towards deriving an agreed-upon set to base IVC simulations on and, thus, ultimately, help keep future research reproducible and comparable.","PeriodicalId":360427,"journal":{"name":"Proceedings of the ninth ACM international workshop on Vehicular inter-networking, systems, and applications","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126061833","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Feasibility of virtual traffic lights in non-line-of-sight environments","authors":"Till Neudecker, Natalya An, O. Tonguz, Tristan Gaugel, Jens Mittag","doi":"10.1145/2307888.2307907","DOIUrl":"https://doi.org/10.1145/2307888.2307907","url":null,"abstract":"Motivated by the idea to reduce deployment costs and to dynamically regulate vehicular traffic flows at intersections, inter-vehicle communications based virtual traffic lights are envisioned to replace traditional infrastructure based traffic lights. According to recent studies, virtual traffic lights are expected to increase traffic flow by up to 60%. Yet, those studies were based on the assumption of a perfectly reliable communication, i.e., notification messages which signal a traffic light were always received by vehicles located within a certain distance to the sender. Hence, effects such as signal fading or non-line-of-sight conditions due to buildings were neglected. Such effects, however, can have a negative impact on the dissemination of the notification messages. This poster paper therefore studies whether these effects lead to significantly larger dissemination delays or not, and whether this increase is crucial for the feasibility of virtual traffic lights. According to the results of this study, the delay is not significantly larger, and virtual traffic lights seem to be feasible under such challenging conditions.","PeriodicalId":360427,"journal":{"name":"Proceedings of the ninth ACM international workshop on Vehicular inter-networking, systems, and applications","volume":"104 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121556894","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}