Efficient Data Dissemination in Vehicular Ad Hoc Networks

Abstract

In recent years, Vehicular ad hoc networks (VANETs) have gained a lot of attention both from academia and industry due to their flexibility to provide uninterrupted services such as-entertainment, adaptive route selection, etc., to the end. In VANETs, vehicles interact with other vehicles and to the fi xed infrastructures for data dissemination. In VANETs vehicles act as intelligent sensing units having communication and computation capabilities with Application Unit (AU), and On Board Unit (OBU) installed in them. These units can be used in wide range of applications including alert generation, community services, tra c management, etc. and can also impart security, safety and comfort to the on board passengers. With an increasing use of vehicular communications, there may be congestion in the network and quality of service may be compromised. This results in a performance degradation in data dissemination also. A number of research proposals for effi cient data dissemination have been laid down since its inception. Most of the existing solution for data dissemination in VANETs were unable to provide a comprehensive scheme to meet the Quality of Service (QoS) parameters. Moreover, the existing schemes were unable to provide reliable communication and the broadcast storm problem was not been solved completely. Hence, there was a need of a new solution that meets the desired QoS parameters and ensures reliable communication. To address the challenge of meeting the QoS parameters also with changing topology in high mobility scenario, a Quality-Aware Data Dissemination (QADD) scheme has been proposed for VANETs. The protocol was tested for delay incurred, extra messages generated and percent active links with varying vehicle density and speed. QADD successfully overcomes the broadcast storm and gray zone problems and has lowered the generation of extra messages as compared to SOBP [1] and DDOR [2] schemes. The recovery algorithm proposed in this proposal makes it fault tolerant.