A review of broadcasting safety data in V2V: Weaknesses and requirements

One of the main goals in using vehicular ad hoc networks (VANETs) system is to provide the driver of a vehicle with services that helps him/her in avoiding chain accidents and traffic jam. Vehicles can get different services from global servers when connecting to the internet or can cooperate with each other, where each vehicle behaves as a collector for traffic information and a disseminator of necessary data to the neighbouring vehicles during their journey. However, disseminating safety data between connecting vehicles is a challenging task due to the quick change in the wireless network topology, and the broadcast protocol's reliance on many physical parameters (e.g. vehicle's speed, location, roads structures etc.). Thus, getting a reliable VANET system and ensuring the integrity of messages are the main objectives when introducing any dissemination method. This paper reviews several existing VANET safety applications, and revises the disseminating methods for safety messages between vehicles without infrastructure to cover a wide area in a quick reliable way. Wherefore we include relevant works that present different methods to broadcast the warning message between vehicles, particularly when no infrastructure is available. Towards the conclusion, we show a classification tabular for these works, and a comprehensive feedback to reach the optimal perception of the broadcast scheme during safety data dissemination that depends on three objects; the environment, the vehicle as a sender, and the vehicle as a receiver.