A Priority Packet Dissemination Scheduling Mechanism in Vehicular Ad-Hoc Networks

Abstract

One of the vehicle communication technologies in the Intelligent Transport System is the Vehicular Ad-Hoc Networks (VANETs). VANET is a communication technology between one vehicle with other vehicles so as to reduce the impact of traffic accidents. Quality of Service requirements in VANETs communications has been supported by the standard protocol, IEEE 802.11p WAVE (Wireless Access in Vehicular Environment) protocol. The mechanism used in this protocol is CSMA/CA that divides four access categories in the selection of channel access by ensuring the success of more priority packets compared to the low priority ones. However, if another vehicle has the same priority packet to send, then a collision might happen. This paper proposes a packet deployment mechanism based on priority. Priority packets are estimated based on location and traffic conditions of vehicles, and then the AODV protocol is used for data deployment. Experimental results showed that priority based channel access perform better than CSMA/CA with an increasing PDR average about 24%, throughput of about 0.25 Mbit/sec and delay of about 0.0969 seconds.