Development of an alert message dissemination protocol based on LEACH protocol to improve VANET road safety

The VANET (Vehicular Ad hoc Network) is a collection of mobile nodes forming a temporary network on variable topology, operating without base station and without centralized administration. The characteristics of VANET network that distinguishes it from other ad hoc networks, such as high mobility and communication with the infrastructure to support security or comfort applications, have prompted researchers to develop models and mobility-specific protocols[1] [2]. The main goal of our work is firstly to integrate the alerts functionality to LEACH protocol by developing five procedures that will ensure the following features: - Event point detection - Search close neighbors - Sending of messages to nearby neighbors - Communications From vehicles to infrastructure - Communications From infrastructure to vehicles The second goal is to examine the impact of varying density on the number of received packets, sent packets and average delay. The results of our work show that our proposed algorithm is reliable in view of the number of packets sent / received and of the low average delay.