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Routing of data in a vehicular ad hoc network is a challenging task due to the high dynamics of such a network. Recently, it was shown for the case of highway traffic that position-based routing approaches can very well deal with the high mobility of network nodes. However, base-line position-based routing has difficulties to handle two-dimensional(More)
Position-based routing, as it is used by protocols like Greedy Perimeter Stateless Routing (GPSR) [5], is very well suited for highly dynamic environments such as inter-vehicle communication on highways. However, it has been discussed that radio obstacles [4], as they are found in urban areas, have a significant negative impact on the performance of(More)
One key usage of VANET is to support vehicle safety applications. This use case is characterized by the prominence of broadcasts in scaled settings. In this context, we try to answer the following questions: <i>i)</i> what is the probability of reception of a broadcast message by another car depending on its distance to the sender, <i>ii)</i> how to give(More)
The random waypoint model is a commonly used mobility model for simulations of wireless communication networks. By giving a formal description of this model in terms of a discrete–time stochastic process, we investigate some of its fundamental stochastic properties with respect to: (a) the transition length and time of a mobile node between two waypoints,(More)
References Paper: " Contention-based forwarding for mobile ad hoc networks " Authors:  select the next hob based on position information-> a package is forwarded in the geographical direction of the destination  use GPS to get position information  only need local knowledge The two main parts of position-based routing 1) location service: provides a(More)
The last several years has seen significant interest and progress in the field of Vehicular Ad Hoc Networks (VANET). VANETs comprise vehicle-to-vehicle and vehicle-to-infrastructure communications based on wireless local area network (WLAN) technologies. The unique set of candidate applications (e.g. collision warning, local traffic information for(More)
—Direct radio-based vehicle-to-vehicle communication can help prevent accidents by providing accurate and up-to-date local status and hazard information to the driver. In this paper, we assume that two types of messages are used for traffic safety-related communication: 1) Periodic messages (" beacons ") that are sent by all vehicles to inform their(More)
NS-2, with its IEEE 802.11 support, is a widely utilized simulation tool for wireless communications researchers. However, the current NS-2 distribution code has some significant shortcomings both in the overall architecture and the modeling details of the IEEE 802.11 MAC and PHY modules. This paper presents a completely revised architecture and design for(More)
The Fleetnet project aims at the development of a wireless ad hoc network for inter-vehicle communications. We present the rationale behind the choice of an appropriate radio hardware and the use of a position-based routing approach and outline applications to exploit the Fleetnet platform. In addition, we discuss simulation of vehicle movements as a basis(More)