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Wireless vehicle-to-vehicle (V2V) and vehicle-to-infrastructure (V2I) communication holds great promise for significantly reducing the human and financial costs of vehicle collisions. A common characteristic of this communication is the broadcast of a device's core state information at regular intervals (e.g. a vehicle's speed and location, or a traffic(More)
Channel congestion is one of the major challenges for deployment of collision avoidance systems based on DSRC (Dedicated Short Range Communication) in large scale networks. If vehicles do not adapt to congestion conditions, DSRC transmissions could encounter extensive packet losses in areas of high vehicle density, leading to degradation in the performance(More)
IEEE 802.11p is an emerging standard designed to provide wireless access in a vehicular environment. A major application of 802.11p-based Dedicated Short Range Communications (DSRC) is Vehicle to Vehicle (V2V) safety messaging. The US FCC has designated 75 MHz of bandwidth in the 5.9GHz band to support DSRC with a maximum permissible transmit power level of(More)
— Channel congestion is one of the major challenges for IEEE 802.11p-based vehicular ad hoc networks. Unless controlled, congestion increases with vehicle density, leading to high packet loss and degraded safety application performance. In this paper, we study two classes of congestion control – reactive and adaptive. The reactive approach is represented by(More)
Emerging applications rely on wireless broadcast to disseminate time-critical information. For example, vehicular networks may exchange vehicle position and velocity information to enable safety applications. The number of nodes in one-hop communication range in such networks can be very large, leading to congestion and undesirable levels of packet(More)
This paper proposes an approach to Traffic Engineering that uses Differentiated Services (diffserv) and Multi-Protocol Label Switching (MPLS) to provide quantitative QoS guarantees over an IP network. An algorithm that determines QoS-constrained routes is proposed and a framework that uses such an algorithm is outlined. This framework removes the(More)