Vehicular communication systems

About: Vehicular communication systems is a research topic. Over the lifetime, 2532 publications have been published within this topic receiving 64775 citations. The topic is also known as: V2V & vehicle-to-vehicle.

Deterministic access for DSRC/802.11p vehicular safety communication

Abstract: In this work, we present the design of an efficient Deterministic medium Access (DA) for Dedicated Short-Range Communication (DSRC) vehicular safety communication over IEEE 802.11p, called Vehicular DA (VDA). VDA supports two types of safety services (emergency and routine safety messages) with different priorities and strict requirements on delay, especially for emergency safety messages. VDA processes both types of safety messages to maintain a balance between two conflicting requirements: reducing chances of packets collisions and lowering the transmission delay. To avoid long delays and high packets collisions, VDA allows vehicles to access the wireless medium at selected times with a lower contention than would otherwise be possible within two-hop neighborhood by the classical 802.11p EDCA or DCF schemes. Particularly, our scheme provides an efficient adaptive adjustment of the Contention Free Period (CFP) duration to establish a priority between emergency and routine messages. Simulations show that the proposed scheme clearly outperforms the classical DCF scheme used by 802.11p in high-offered load conditions while bounding the transmission delay of safety messages.

Limits of Predictability for Large-Scale Urban Vehicular Mobility

Abstract: Key challenges in vehicular transportation and communication systems are understanding vehicular mobility and utilizing mobility prediction, which are vital for both solving the congestion problem and helping to build efficient vehicular communication networking. Most of the existing works mainly focus on designing algorithms for mobility prediction and exploring utilization of these algorithms. However, the crucial questions of how much the mobility is predictable and how the mobility predictability can be used to enhance the system performance are still the open and unsolved problems. In this paper, we consider the fundamental problem of the predictability limits of vehicular mobility. By using two large-scale urban city vehicular traces, we propose an intuitive but effective model of areas transition to describe the vehicular mobility among the areas divided by the city intersections. Based on this model, we examine the predictability limits of large-scale urban vehicular networks and obtain the maximal predictability based on the methodology of entropy theory. Our study finds that about 78%–99% of the location and above 70% of the staying time, respectively, are predicable. Our findings thus reveal that there is strong regularity in the daily vehicular mobility, which can be exploited in practical prediction algorithm design.

Anti-collision early warning method based on DSRC vehicle-to-vehicle communication technology

Abstract: The invention provides an anti-collision early warning method based on a DSRC vehicle-to-vehicle communication technology. The anti-collision early warning method based on a DSRC vehicle-to-vehicle communication technology can calculate whether a risk of collision between two vehicles exists according to the position and the speed information of a personal vehicle, and the position and the speed information of other vehicles. For the anti-collision early warning method, vehicle communication is performed based on DSRC; each one of mutually communicating two vehicles carries a vehicle device; and the vehicle device sends the position and speed information of the personal vehicle and receives the position and speed information of other vehicles in the communication range. The anti-collision early warning method relies on the BSM (Base Safety Message) in a DSRC communication protocol, and is high in standardability; after promotion of the DSRC, the anti-collision early warning method can be applied widely and is suitable for a vehicle networking system for the future DSRC communication.