An Efficient Propagation Method for Emergency Messages in Urban VANETs

Regular-hexagon-equilateral-triangle area grouping–based broadcast protocol for safety message in urban vehicular ad hoc networks

“…Yu and Heijenk 24 proposed the redundant information suppression mechanism based on the distance between broadcast node and reception node, and the variation of the distance is used to dynamically adjust the WT of the transmitted broadcast information by the reception node for different network node densities, while the vehicle traveling in the opposite direction is used for transmission of information. Lee et al 25 proposed the Broadcast Algorithm with Intersection Recognition (IRA), which selects the relay node by taking into account both the location of the vehicle node and the traveling direction of the vehicle and employs the periodic beacon to acquire neighbor information for identification of road intersection; IRA distributed messages adopting different schemes at intersection and on straight road, it forwards message toward four directions at intersection and two directions on straight road, so it divides vehicles into four groups and two groups, respectively, at intersection and on straight road, so that the link delay can be reduced and the transmission rate can be raised while the information is transmitted into the surrounding area of the accident node. To the best of our knowledge, our protocol is only one which adopts the geometric graphic structure to group the vehicles for message transmission, and we adopt RHET dividing vehicles into groups and select the closest node to apex of graphic structure as relay node.…”

“…Finally, the proposed protocol is compared with the IRA emergency information protocol proposed by Lee et al, 25 UV-CAST protocol proposed by Viriyasitavat et al, 18 and classic Flooding protocol.…”

“…For each of the scenes, data is sampled though 10 experiments for analysis of coverage rate, link delay, network overhead and transmission node, and for future performance evaluation of RHETBP. Finally, the proposed protocol is compared with the IRA emergency information protocol proposed by Lee et al, 25 UV-CAST protocol proposed by Viriyasitavat et al, 18 and classic Flooding protocol.…”