Organized Approaches to Improve the Performance of Vehicular Networks

Abstract

Vehicular Networking is an emerging technology defined with the main motive of avoiding on road accidents and providing safety and life critical applications to users in a well-organized manner. Vehicular ad hoc networks (VANETs) are main part of vehicular networks and this technology is becoming prominent in this era and it also aims at providing various entertainment applications in an orderly and efficient manner. In this thesis work, we present techniques to improve the performance of vehicular networks to transmit more data in lesser transmissions and reduce the channel congestion by controlling lower layers parameters. Index coding has proven its significance in reducing number of transmissions in wireless networks. This technique is used to reduce transmissions in vehicular networks, where multiple clients demand data from server and these demands are fulfilled by the server using index coding. Multiple files can be encoded into a single file of nearly same size using index coding. This transmission of multiple files in a single file reduce transmissions and eventually result in saving transmission bandwidth. Simulation results show that the proposed technique performs better over available techniques. Results are obtained for different initial repository contents of server and clients, to verify the protocol performance under various availability of required side information for index coding. The idea of interconnecting everything in Internet of things (IoT) has evolved as a promising networking system and VANETs are one of the components of it. The aim is to connect every vehicle to every other vehicle for the purpose of improving users’ quality of life. Decentralized Congestion Control (DCC) techniques are specified to reduce medium congestion and provide various safety applications. Decentralized congestion control techniques are presented which work by adapting transmit parameters combined with power. Message rate and data rate are the adapted parameters along with power control mechanism. These techniques are developed considering two-state active design proposed by ETSI and the performance is tested under real world scenario generated using SUMO. This adaptation of transmit parameters helps in maintaining congestion within specified limits proposed by the standard. There is increase and iiidecrease in message rate for message rate adaptation technique depending on available channel load and DCC state. This variation in message rate allows more channel utilization and the system is always maintained in active state.