This information can be shared with other nodes in the network and is central requirement for VANET application like navigation, intelligent transportation, collision avoidance and location based services. In case of emergency all the vehicles in the network are not affected so broadcasting of alert packet is not feasible rather multicasting of alert packet should be done, but defining the list of node to be considered for multicasting is a challenging task as every vehicle cannot hold the location information of all the vehicles in the network. | ISSN:2249-5789 Niyoti Pathak et al , International Journal of Computer Science & Communication Networks,Vol 4(2),46-52 EFFECTIVE RELATIVE POSITION DETECTION FOR MULTICASTING OF ALERT MESSAGES Niyoti Pathak IV Sem WCC TGPCET,Nagpur Affiliated to Nagpur University Email id: niyotipathak21@ Abstract- Global Positioning System (GPS) is a space-based satellite navigation system that provides location and time information in all weather conditions, anywhere on or near the Earth. This information can be shared with other nodes in the network and is central requirement for VANET application like navigation, intelligent transportation, collision avoidance and location based services. In case of emergency all the vehicles in the network are not affected so broadcasting of alert packet is not feasible rather multicasting of alert packet should be done, but defining the list of node to be considered for multicasting is a challenging task as every vehicle cannot hold the location information of all the vehicles in the network. Calculating the list of relative vehicles position depends on the travelling direction, bearing angle and the distance. Road side unit manages all the vehicles information and detect the failure vehicles and calculate the details of the vehicles which are affected by the failure vehicle using the geo positioning and multicast alert packets to identified vehicles. This will narrow down the broadcasting scenario and prevent the traffic congestion which is caused by message delivery to unwanted vehicles. Keywords- Global positioning system(GPS) , Road Side Units (RSU’s), Vehicular Adhoc Network (VANET). 1. Introduction Vehicular Ad Hoc Network (VANET) is a technology that uses moving vehicles as node in a network to create a mobile network. VANET create a network with a wide range by turning every participating vehicle into a wireless router or node and allow vehicles to connect with each other. In VANET vehicle communicate with each other or road
