A survey on the routing schemes of urban Vehicular Ad Hoc Networks

As an application of mobile ad hoc networks in transportation realm, Vehicular Ad hoc Network (VANET) is a prominent technology for inter-vehicle communications in Intelligent Transportation System. City environment is a main scenario for VANET applications, and routing for urban VANET faces greater challenges because of potential more uneven distribution of vehicular nodes, constrained mobility pattern and difficult signal reception due to radio obstacles. This paper investigates and compares several routing algorithms designed for urban VANET. A qualitative comparison of these approaches is provided as well as some opportunities for future research. The goals and key elements of a well-performed routing scheme are also proposed to help designing a solution to meet city scenarios.