Modeling Enhancements in Routing Protocols under Mobility and Scalability Constraints in VANETs

Abstract

This paper presents mathematical framework for calculating transmission probability in IEEE 802.11p based networks at Medium access control (MAC) layer, mathematical framework for calculating energy costs of the chosen routing protocols at network layer, and enhancements in optimized link state routing (OLSR), dynamic source routing, (DSR) and fish-eye state routing (FSR) to tackle delay in vehicular ad hoc networks (VANETs). Besides the enhancements, we analyze ad hoc ondemand distance vector (AODV) along with OLSR, DSR, and FSR as well. To evaluate the effect of our proposed transmission probabilities in the selected routing protocols, we choose network throughput, end-to-end delay (E2ED), and normalized routing load (NRL) as performance metrics. We also investigate the effect of different mobilities as well as scalabilities on the overall efficiency of the enhanced and default versions of the selected protocols. Simulations results which are conducted in NS-2 show that overall DSR-mod outperforms rest of the protocols.

Flying ad-hoc network application scenarios and mobility models

“…Simulations that involve mobile nodes require a mobility model to represent how the nodes change their position while communicating, in order to analyze the network performance under mobility. 11,12 When flying objects are considered, a mobility model specifically designed for UAVs is needed. Such models are not yet well explored, since many researches ground their simulations on simpler mobility models, like the Random Waypoint (RWP) model, which have actually been designed for traditional mobile ad-hoc networks (MANETs).…”