Improving VANETs Connectivity with a Totally Ad Hoc Living Mobile Backbone

Abstract

The vehicular ad hoc network (VANET) for intelligent transportation systems is an emerging concept to improve transportation security, reliability, and management. The network behavior can be totally different in topological aspects because of the mobility of vehicular nodes. The topology can be fully connected when the flow of vehicles is high and may have low connectivity or be invalid when the flow of vehicles is low or unbalanced. In big cities, the metropolitan buses that travel on exclusive lanes may be used to set up a metropolitan vehicular data network (backbone), raising the connectivity among the vehicles. Therefore, this paper proposes the implementation of a living mobile backbone, totally ad hoc (MOB-NET), which will provide infrastructure and raise the network connectivity. In order to show the viability of MOB-NET, statistical analyses were made with real data of express buses that travel through exclusive lanes, besides evaluations through simulations and analytic models. The statistic, analytic, and simulation results prove that the buses that travel through exclusive lanes can be used to build a communication network totally ad hoc and provide connectivity in more than 99% of the time, besides raising the delivery rate up to 95%.

P‐AOMDV: An improved routing protocol for V2V communication based on public transport backbones

“…As presented in the study of Alves and Wille, the MOB‐NET is a mobile ad hoc data network formed by the express buses of the public urban transport network. The function of the MOB‐NET is to provide connectivity and favor the message exchange among the vehicles in a wide region.…”

“…The experimental analysis aims to analyze the inter‐vehicular distance to be able to determine the connectivity degree of the MOB‐NET. For these studies, real data from buses traveling in the express lanes of the city of Curitiba (Paraná), Brazil, were analyzed …”

“…According to this histogram, considering a transmission range of 1 km (IEEE 802.11p standard ), the connectivity degree overcomes 99%, which means, the fraction of time where the inter‐vehicular distance is less than or equal to the transmission range in the wireless system is less than 1%. The full experimental study can be found in the work of Alves and Wille …”

“…In all cases the normalized histograms possess similar characteristics to the ones presented in the experimental studies. As an example, Figure illustrates the histogram obtained in 1 certain simulation …”

“…For that, a mobile ad hoc backbone (MOB‐NET) and a new routing protocol will be considered. As presented in the study of Alves and Wille, the MOB‐NET is a mobile ad hoc data network formed by the buses in the public transport, whose function is to provide connectivity and favor the message exchange among the vehicles in a wide region. Thus, the paper focuses on a city environment.…”