Relay Node Placement to Improve VANETs Connectivity

Abstract

With the tremendous advancement in mobility and network technology, Vehicular ad-hoc Networks (VANETs) have attracted researchers from both academia and industry. Mobile connectivity, traffic congestion, and road safety management consider applications that were created within the network paradigm. In Intelligent Transportation Systems (ITS), the cooperation between vehicles is essential; to improve transportation security, reliability, and management However, it is a challenging task to maintain a well-connected network with unbalanced traffic flow on roads; hence, the performance of network depends on the existence of Road Side Unit (RSU) along the roads. This thesis investigates the use of normal dynamic vehicles to works as temporary road side unit (RSU). Global Positioning System (GPS) is used to acquire node position information of the network participants. This schema basically depends on normal vehicles with a zero-infrastructure to improves network connectivity, by using each vehicle position and movement direction to decide whether its good candidate to work as relay vehicle or not. The schema providing ubiquitous communications via vehicle-to-vehicle communication. This can be obtained by establish connection between the source vehicle, which is involved in an accident and the selected relay vehicles. The performance of our schema is estimated by two scenarios, the first one is static network connectivity behavior represented by the message reachability and while the second scenario is dynamic network connectivity, we used metrics that capture the variation of the network connectivity with respect to time such as connection duration, re-healing time and receiving time.