Somayyeh Iman Alizadeh - Islamic Azad University, Shahriyar Branch, Shahriyar, Iran

The vehicular ad hoc networks have a considerable role in increasing the roads safety and traffic improvement in the intelligent transportation systems. To this purpose, there is the need for efficient emission of data among vehicles. However, these vehicular ad hoc networks have their own special features such as nodes movement, the topology limited to predefined roads, and high speed of vehicles. Thus, designing of the routing protocols is a challenging work. One of the significant challenges is the safety of vehicular ad hoc networks when they are communicating with each other or with the roadside units. The routing protocols in vehicular ad hoc networks must be able to avoid the attacks and detect the rogue nodes. In this paper, by concentrating on safety in vehicular ad hoc networks, a combinational criterion is proposed to detect the rogue nodes that according to calculating the power of the real signal and power of signal obtained by sending the transferred beacon packets in terms of distance, if the difference of which is larger than a threshold value, the node will be considered as rogue and omitted from the sending set. The results of simulation have represented that proposed method has caused ۱۴% and ۷% increase of delivery rate, ۱۸% and ۱۷% increase in the throughput, ۲۶% and ۱۲% decrease in the packet loss rate, ۲۸% and ۱۹% decrease in the end to end delay compared to the FD and BDSC methods.

vehicular ad hoc networks, rogue nodes, broadcast of data messages, signal power