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This paper presents GeoVCom, a robust geocast protocol for vehicular networks. GeoVCom allows a vehicle to send geocast messages to all vehicles in a given geographical area without the sender having any knowledge about which vehicles are present in that area. GeoVCom is ad hoc, scalable and can handle communications under a wide variability of traffic load. The authors investigate the performance of GeoVCom in both simulation and real world tests using an implementation running on smart phones. Their field deployment and simulation results show that the number of transmissions per geocast message is kept low, significantly outperforming conventional flooding algorithms and at the same time maintaining a high (over 90%) success rate.
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