Abstract:

VANETs is an application of traditional mobile ad hoc networks in traffic roads. In VANETs, most forward within radius scheme can effectively reduce hops of data dissemination and redundancy sending, however, its reliability can be adversely affected due to the farthest node failure. Given that the high mobility of VANETs may cause serious farthest node failure, which is analyzed and verified by experiments, we propose two improved methods, i.e. the safe distance method and the failure prediction method. The safe distance method chooses the neighbors whose distance are closest to the calculated safe distance as relay nodes, while the failure prediction method estimates neighbors’ position by state parameters, therefore avoiding choosing those neighbors who may be out of communication ranges as relay nodes. Simulation results show that the two methods can reduce the failure rate of relay nodes and improve the reliability of data dissemination to certain extent.

Key words: VANETs, most forward within radius, relay node failure, reliability