Survivable and reliable design of cellular and vehicular networks for safety applications
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Abstract
The research work is divided into two focus areas namely: cellular networks and vehicular networks. The first part of the research work is in cellular networks. Cellular network design and operation must incorporate disaster response and repair scenarios. Requirements for high reliability and low latency often fail to incorporate network survivability for mission-critical services. This work defines a practical modeling approach using a Markov chain Matrix Exponential (ME) model. This model is scalable for larger networks, calculates the restoration and network availability times, consists of asymptotic approximations to estimate network availability, and determines the optimal number of repair crews required. This ME model shows how survivable networks can be designed based on controlling numbers of crews, times taken for individual repair stages in the repair process, and the balance between fast and slow repairs. In the second part, different aspects of vehicular networks have been analyzed for emergency vehicle purposes. Vehicular ad-hoc networks (VANETs) have been an important part of intelligent transport systems (ITS). Due to the highly dynamic nature of the network, it can support some safety-critical applications such as providing network capabilities to emergency vehicles, avoiding crashes involving emergency vehicles, etc. In this part of the research work, a simulation approach has been discussed to evaluate an ambulance transit using VANET capabilities. The simulation is performed using ns3/SUMO/TraCI software tools and four different scenarios are formulated. These scenarios differ by the nature of the network being implemented and additional functionalities like re-evaluating the route added to the ambulance or other cars on the road network. Performance metrics like delay, packet drop ratio, the average speed of the ambulance, average vehicle density, ambulance message interval time are evaluated, and the results are presented. Developing a reliable network for vehicle-to-vehicle communication is a crucial part of network deployment. In this third part of the research work, we discuss a layered approach towards the reliability of VANETs. This work will consider different layers of the dedicated short-range communications (DSRC) protocol stack and discuss key reliability indicators in each layer. This layered approach towards computing reliability results in more practical probability calculations. We also discuss different techniques to increase the reliability of VANETs. A functional reliability (FR) calculation is also presented to implement the multi-layered reliability context.
Table of Contents
Introduction -- Survivability modeling in cellular networks -- Emergency Vehicle Performance Ad-hoc Networks (VANETS) -- A multi-layered reliability approach in vehicular Ad-hoc -- Conclusion and future scope
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Ph.D. (Doctor of Philosophy)