LARB: Location-aware reliable broadcasting protocol in VANET

Intelligent Transportation System enables various safety applications that rely on wireless ad hoc communication. The safety applications require fast dissemination, reliability, and restricted area dissemination so only important information will be delivered to the right vehicles. Not only a reliable broadcasting protocol is needed but also an ability of location awareness is required. Therefore, most of previous works use GPS for their location detection as their only solution but GPS has a well-known inaccuracy issue in closed area such as an area in the middle of high building or an area under express ways or bridges. In this paper, we propose a location-aware reliable broadcasting protocol for safety applications. Instead of using GPS, we develop a adaptive maximum hop calculation that flexibly adapt the number of hops depending on vehicle density to broadcast message within desired distance. In order to provide fast and reliable broadcasting, the proposed protocol relies on DECA which is a reliable broadcasting protocol developed in our laboratory. Our simulation results show that our protocol with our hop calculation competes previous protocols using GPS. In term of coverage results, our protocol disseminates data up to 100% of total vehicles in the boundary.