Effective warning data dissemination scheme in vehicular networks for Intelligent Transportation System applications

Warning data dissemination using vehicular networks is envisioned in Intelligent Transportation System applications. Due to extended connectivity of roadway vehicles and consequent extension of region of data propagation, data may be accessed in some geographical areas where it is neither relevant nor effectively beneficial. Moreover, propagating data to irrelevant regions increases communication cost. Therefore it is crucial to limit the warning data dissemination to a certain region. This research strives to address the above challenges by proposing an effective warning data dissemination which restricts data dissemination to a Region of Interest (Rol). Among the factors influencing the Rol determination, the type of warning message is considered so that the more severe the incident, the wider the Rol. Also, in order to reduce message overhead during data dissemination, the strategy which assigns the responsibility of packet retransmission to only certain vehicles (relays) is deployed. In the selection of the relay point, border relay area where the relay point is placed, is adapted to the traffic density so that the higher the traffic density, the narrower the relay area. The proposed scheme informs the vehicles located in the immediate vicinity of an incident, reduces message overhead, and prevents unnecessary and inappropriate message dissemination.