A Multicast Protocol in Ad hoc Networks Inter-Vehicle Geocast

Abslracf-The Intelligent Transportation Systems ITS cause a in a suitable way (i.e., voice). The rigor of these applicasignificant passion since the appearance of new Inter-Vehicles tions requires the establishment of real time communication Communication On mobile networks. The mechanisms. This requirement makes the realization of such wireless ad hoc networks, completely distributed and not depending on allow the fast and cheap development of applications increasingly difficult. Work in this domain aims such mechanisms. to inform in real time the users of a highway in case of a This article concerns multicast in wireless ad-hoc networks possible accident. This information is communicated using a applied to ITS. We PmPose a new Protocol called IVG Interbroadcast of a message, called user alarm message. Recent Vehicles Geocast which consists in informing all the vehicles of SOIUt,onS have tendency to use communication techniques of a highway about any danger such as an accident or any other obsecle, In this case, risk areas are according to ad hoc wireless networks. The choice of ad hoc networks, the driving direction and the positioning of the vehicles. n e s e Contrary to Cellular networks, iS justified by the fact that vehicles define a restricted broadcast group, so-called, multicast these networks are organized without an infrasttucture which p u p . Multicast group, contrary to the classical methods, which avoids the blocking and the unavailability of the network as in use node identities. is defined temporally and dynamically by GSM. M ~ ~ ~ ~ ~ ~ ~ , the total absence of infrastructure and the location, speed and driving direction of vehicles. Some simulations thank to Glomosh t ol, for which we haye defined equipment (like routers and multiplexes) in ad ha: networks a model Cor the mad transport, and studies of the complexity are allows faster and cheaper deployment. given. The msults show that IVG is an efficient broadcast method The goal of this work is to propose a more effective and for Secure highway transPo-tion and d u c e s the number Of scalable dissemination of the alarm message. To be more optimal, this alarm message should be addressed only to useful messages.