Reliable broadcasting for active safety applications in vehicular highway networks

Vehicular communication is regarded as a major innovative feature for in-car technology. While improving road safety is unanimously considered the major driving factor for the deployment of Active Safety Intelligent Vehicle Safety Systems, the challenges relating to reliable multi-hop broadcasting are many in vehicular networking. In fact, safety applications must rely on very accurate and up to date information about the surrounding environment, which in turn requires the use of accurate positioning systems and smart communication protocols for exchanging information. Communications protocols for vehicular ad hoc networks (VANETs) must guarantee fast and reliable delivery of information to all vehicles in the neighbourhood, where the wireless communication medium is shared and highly unreliable with limited bandwidth. In this paper, we present a geo-broadcasting extension to the Slotted Restricted Mobility-Based (SRMB) broadcasting protocol and compare it with existing geobroadcasting protocols in highway environments.