Impact of 802.11p Channel Hopping on VANET Communication Protocols

Vehicular Ad-Hoc Networks (VANETs) are a specific type of moving networks in which the nodes are vehicles with processing, storage and wireless communication capacity. The Wireless Access in Vehicular Environments (WAVE) presents an architecture, based on a division into multiple channels with each channel set certain types of application and that uses a switching mechanism for the selection of channels, since only one channel is active at a given time. However, in certain scenarios, this channel switching mechanism approach used in WAVE introduces an undesirable effect that allows different vehicles to transmit simultaneously, resulting in collisions. In this work, we propose a solution to this problem, with the development of a mechanism based on recalculation of transmission delay to ensure greater performance in transmissions. The mechanism proposed, named as Desync, was evaluated in two different data dissemination protocols, ABSM and AID. The simulation results show that the Desync is effective in reducing collisions and maximizing the delivery rate.