Abstract
Vehicular Ad Hoc Network (VANET) is an emerging area of research now-a-days due to its support for road safety and comfort applications. VANET is a subclass of Mobile Ad Hoc Network (MANET) which allows vehicle to vehicle (V2V) as well as vehicle to infrastructure (V2I) communication. Due to high mobility and frequently changing topology of vehicles, the MANET protocols cannot be directly used for VANET environments. The major research challenges in VANET are congestion control, link repair and collision avoidance. Mobile as well as fixed infrastructure units play an important role in the efficient routing in VANET by providing the traffic information to the vehicles on road. The fixed infrastructure mainly consists of traffic lights and road side units whereas the mobile infrastructure mainly consists of buses which are used for communication in VANET. In this paper, some infrastructure based routing protocols are discussed which offer higher Quality of Service (QoS) than the existing VANET routing protocols.
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