Re-transmission strategy for broadcasting in VANETs

Safety-related applications targeted at Vehicular Ad-hoc Networks (VANETs) use Vehicle-to-Vehicle (V2V) com­munication, this communication method disseminates safety in­formation to all vehicles within its range. However, V2V is broad­cast in nature and error-prone and has many safety constraints during the short contacting time. The solution to this problem is discussed in many existing literature, which use RTB/CTB, beacons, broadcast suppression, polling, etc. But the problem faced after a failed transmission is a proper re-transmission. We propose a re-transmission strategy which utilizes the medium efficiently and increases the chance of nodes receiving the safety message. This re-transmission strategy involves a round trip time (RTT) based forwarder selection, which is used in re-transmission of broadcast messages. We use the polling scheme as the safety message broadcast strategy.