Avoiding Traffic Congestion Using Position based and Cognitive Radio in VANET

Abstract

Inter-Vehicle Communication System (IVCS) built in a city environment faces
greater challenges because of uneven distribution of vehicular nodes, mobility constrained,
and difficult signal reception due to radio obstacles such as high rise buildings. This paper
proposes a new position-based routing scheme designed specifically for IVCS in a city
environment and for the roadside equipment using a Cognitive Radio to allocate a multiple
channel for communicating between vehicles and infrastructure to provide a safety
messaging to handle emergency situation. Currently VANET is implemented using ETT and
ETX system which uses Waited Corrective (WC ETT) mechanism. The delay incurred in this
system is improved here by making use of Cognitive Radio which allocates multiple
channels simultaneously. This paper also proposes to use A-star Algorithm for inter-vehicle
communication which supports dynamic status updates on neighbors, sink and their
energy levels so as to extended WSN lifetime.