Download or read book Survivable and Reliable Design of Cellular and Vehicular Networks for Safety Applications written by Hasita Kaja and published by . This book was released on 2021 with total page 117 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Vehicular Networking for Road Safety written by Feng Lyu and published by Springer Nature. This book was released on 2020-08-06 with total page 169 pages. Available in PDF, EPUB and Kindle. Book excerpt: The topics addressed in this book are crucial for both the academic community and industry, since the vehicular network has become an essential building block for intelligent transportation systems. The systematic principle of this book provides valuable guidance on the deployment and implementation of V2X-enabled road-safety applications. In addition, this book carries out structured technologies from the MAC layer to the link and network layer, which can provide a general introduction for interested readers with a comprehensive understanding of applying vehicular networks in enhancing road safety, and offers a systematized view for researchers and practitioners in the field of vehicular networks to help them optimize and improve the desired vehicular communication systems. Road safety has always been the first priority for daily commuters on the road. Vehicular networks can be an effective solution to enhance road safety, via which vehicles can exchange cooperative awareness messages rapidly, contributing to better situation awareness and maneuvering cooperation. However, with the fast-changing network topology, intermittent wireless link, and dynamic traffic density, it is challenging to achieve satisfying network performance. This book introduces the background of vehicular networks, provides a comprehensive overview of networking techniques in supporting road-safety applications, states the technical motivations per the MAC, link, and network layer, and proposes/designs vehicular networking technologies at the corresponding layer respectively to guarantee low-latency and reliable V2X communications for road-safety applications. By extending the proposed networking technologies to support all types of vehicular services, this book also outlines open issues and research directions in future 5G and beyond vehicular networks.
Download or read book Safety Message Broadcast in Vehicular Networks written by Yuanguo Bi and published by Springer. This book was released on 2016-12-16 with total page 119 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents the current research on safety message dissemination in vehicular networks, covering medium access control and relay selection for multi-hop safety message broadcast. Along with an overall overview of the architecture, characteristics, and applications of vehicular networks, the authors discuss the challenging issues in the research on performance improvement for safety applications, and provide a comprehensive review of the research literature.A cross layer broadcast protocol is included to support efficient safety message broadcast by jointly considering geographical location, physical-layer channel condition, and moving velocity of vehicles in the highway scenario. To further support multi-hop safety message broadcast in a complex road layout, the authors propose an urban multi-hop broadcast protocol that utilizes a novel forwarding node selection scheme. Additionally, a busy tone based medium access control scheme is designed to provide strict priority to safety applications in vehicle-to-infrastructure communications.This book offers useful insights into protocol design and inspires a new line of thinking in performance improvements for safety applications in vehicular networks. It is a valuable resource for professionals, researchers, or advanced-level students working in vehicular networks or quality of service.
Download or read book Design of a Medium Access Control Protocol that Exploits the Structures of Vehicular Networks written by Kong Lam and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Vehicular networks (VANETs) have distinctive structures that distinguish them in comparison to general mobile ad hoc networks. In this thesis we identify the relevant special structures that do exist, and show how they can be exploited to design a MAC layer that provides better performance than a MAC layer designed without taking such structures into account. Particular important examples of the structures in VANETs are: (i) Periodic broadcast is the common transmission pattern due to the requirements of vehicular safety applications; (ii) GPS is available on nodes; (iii) Node mobility is constrained along one-dimensional roadways, and traffic can only move in one of the two directions of each roadway; and (iv) Traffic moving on one lane in one direction of a road has group mobility. These structures offer unique exploitable opportunities for building specific protocols tailored to VANETs which perform better than other general purpose protocols designed for structureless networks. We will show that, at the MAC layer, these structures can be thoroughly exploited to design a protocol based on dynamic TDMA that is well suited for VANETs. We present the Dynamic Channel Partition and Reservation (DCPR) Protocol, which is a specific VANET MAC protocol designed for operating a dynamic TDMA mechanism in a way robust to vehicular mobility, by dynamically partitioning the set of TDMA channels for the use of vehicles according to their different velocities. DCPR also enhances the basic dynamic TDMA mechanism with features for proper operation in a wireless environment with fading. We evaluate DCPR with simulations via ns-2 and VanetMobiSim, using the Intelligent Driver Model with Lane Changing. Our simulation results show that DCPR achieves packet loss rates which are one to two orders of magnitude lower than those obtained by IEEE 802.11p at various vehicle densities and in different vehicular traffic environments. Moreover, DCPR increases goodput by a factor as high as nine in a wireless environment with fading compared to a basic dynamic TDMA protocol. With regard to variations in vehicular traffic, DCPR maintains stable performance across all levels of traffic asymmetry in a highway scenario. Based on the systematic exploitation of group mobility, we are led to suggest an overarching design based on the Velocity Differentiated Dynamic Channel Partition (VDDCP) Mechanism. In the scenarios we have evaluated, DCPR equipped with the VDDCP mechanism performs as well as the original DCPR, and further evaluation is required to determine if there are other scenarios of vehicular traffic geometries and intensities in which the VDDCP mechanism delivers significantly better performance. To summarize, DCPR shows the possibility of building a MAC layer for VANETs that provides high packet delivery rate, supporting the development of vehicular safety applications that demand reliability.
Download or read book Assessing Mission critical Vehicular Safety Applications Under Various Network Conditions written by Mohamad Yonos and published by . This book was released on 2015 with total page 90 pages. Available in PDF, EPUB and Kindle. Book excerpt: Enabling communication among vehicles can facilitate the deployment of safety applications that can improve driving safety and reduce traffic-related fatalities. Assessing the reliability of these safety applications is essential to evaluating VANETs' contributions to improved safety and driving conditions. In this context, I maintain that reliability metrics that express the requirements of safety applications in terms of network performance are much more suitable than standalone network-level metrics, as the latter do not indicate whether the requirements of safety applications can be met. This work considers awareness as an intermediate layer between the application and the network layers, for identifying the different levels of reliability achievable by the different safety applications. Through a comprehensive simulation study, this work analyzes the level of awareness that networks can offer under various scenarios and a wide range of influencing parameters, including transmission power, message generation rate, vehicular density, message size, as well as radio propagation and fading effects. Insights are provided on how network performance metrics address application requirements and contribute to enhancing the reliability of safety applications. Finally, communication parameters necessary to offering high levels of reliability are determined for three representative safety-application requirements.
Download or read book LTE LTE Advanced for Vehicular Safety Applications written by Hossein Soleimani and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: IEEE 802.11p, the known standard for Vehicular Adhoc NETworks (VANETs), suffers from scalability issues and unbounded delay. In addition, the desire to use networks already in existence has created motivation for using cellular networks for vehicular applications. LTE-Advanced is one of the most promising access technologies in the wireless field, providing high data rate, low latency, and a large coverage area. Thus, LTE/LTE-A can be potential access technologies for supporting vehicular applications. Vehicular safety applications are based on broadcasting messages to neighboring vehicles. The vehicle location precision is crucial for safety applications. Thus, the freshness of the information (i.e. vehicle location) at the neighboring vehicles is very important. As LTE is an infrastructure-based network, all transmissions should pass through it. When the load of the network is high compared to the available resources, large delays may occur. The focus of this thesis is to propose solutions to make LTE suitable for vehicular safety applications. The first solution is to adapt the vehicular safety application to be suitable in LTE network. For this purpose, we propose an adaptation of the safety message generation rate. This adaptation uses a queueing model to compute the freshness of the information of vehicles at the destination, based on their message generation rates. It then adjusts the generation periods to provide a similar accuracy for all vehicles. The second approach is to modify the LTE and make it suitable for these kinds of applications. Thus, we proposed a scheduler for LTE which is suitable for vehicular safety applications. It considers the speed and location of the vehicles to allocate the resources to them for the transmission of safety messages. We also studied the message dissemination in the downlink, and proposed an efficient way to deliver the safety messages to the neighboring vehicles. Finally, we propose a scheme that uses both LTE-D2D and LTE-cellular communication for the transmission of safety messages. The centralized location information is used for Device-to-Device (D2D) pair discovery and resource allocation. The proposed scheme provides resource efficiency by enabling the reuse of the resources by vehicles. We also study the effect of the awareness range and period of updating location information at the server on resource usage and accuracy of D2D pair detection.
Download or read book Reliable Broadcast of Safety Messages in Vehicular Ad Hoc Networks written by Farzad Hassanzadeh and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 702 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Safety Design for Space Systems written by Gary Eugene Musgrave and published by Butterworth-Heinemann. This book was released on 2009-03-27 with total page 988 pages. Available in PDF, EPUB and Kindle. Book excerpt: Progress in space safety lies in the acceptance of safety design and engineering as an integral part of the design and implementation process for new space systems. Safety must be seen as the principle design driver of utmost importance from the outset of the design process, which is only achieved through a culture change that moves all stakeholders toward front-end loaded safety concepts. This approach entails a common understanding and mastering of basic principles of safety design for space systems at all levels of the program organisation. Fully supported by the International Association for the Advancement of Space Safety (IAASS), written by the leading figures in the industry, with frontline experience from projects ranging from the Apollo missions, Skylab, the Space Shuttle and the International Space Station, this book provides a comprehensive reference for aerospace engineers in industry. It addresses each of the key elements that impact on space systems safety, including: the space environment (natural and induced); human physiology in space; human rating factors; emergency capabilities; launch propellants and oxidizer systems; life support systems; battery and fuel cell safety; nuclear power generators (NPG) safety; habitat activities; fire protection; safety-critical software development; collision avoidance systems design; operations and on-orbit maintenance. The only comprehensive space systems safety reference, its must-have status within space agencies and suppliers, technical and aerospace libraries is practically guaranteed Written by the leading figures in the industry from NASA, ESA, JAXA, (et cetera), with frontline experience from projects ranging from the Apollo missions, Skylab, the Space Shuttle, small and large satellite systems, and the International Space Station Superb quality information for engineers, programme managers, suppliers and aerospace technologists; fully supported by the IAASS (International Association for the Advancement of Space Safety)
Download or read book Security Privacy and Reliability in Computer Communications and Networks written by Kewei Sha and published by River Publishers. This book was released on 2016-11-30 with total page 446 pages. Available in PDF, EPUB and Kindle. Book excerpt: Future communication networks aim to build an intelligent and efficient living environment by connecting a variety of heterogeneous networks to fulfill complicated tasks. These communication networks bring significant challenges in building secure and reliable communication networks to address the numerous threat and privacy concerns. New research technologies are essential to preserve privacy, prevent attacks, and achieve the requisite reliability. Security, Privacy and Reliability in Computer Communications and Networks studies and presents recent advances reflecting the state-of-the-art research achievements in novel cryptographic algorithm design, intrusion detection, privacy preserving techniques and reliable routing protocols. Technical topics discussed in the book include: Vulnerabilities and Intrusion DetectionCryptographic Algorithms and EvaluationPrivacy Reliable Routing Protocols This book is ideal for personnel in computer communication and networking industries as well as academic staff and collegial, master, Ph.D. students in computer science, computer engineering, cyber security, information insurance and telecommunication systems.
Download or read book VANET written by Hannes Hartenstein and published by John Wiley & Sons. This book was released on 2009-11-04 with total page 466 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides an invaluable introduction to inter-vehicular communications, demonstrating the networking and communication technologies for reducing fatalities, improving transportation efficiency, and minimising environmental impact. This book addresses the applications and technical aspects of radio-based vehicle-to-vehicle and vehicle-to-infrastructure communication that can be established by short- and medium range communication based on wireless local area network technology (primarily IEEE 802.11). It contains a coherent treatment of the important topics and technologies contributed by leading experts in the field, covering the potential applications for and their requirements on the communications system. The authors cover physical and medium access control layer issues with focus on IEEE 802.11-based systems, and show how many of the applications benefit when information is efficiently disseminated, and the techniques that provide attractive data aggregation (also includes design of the corresponding middleware). The book also considers issues such as IT-security (means and fundamental trade-off between security and privacy), current standardization activities such as IEEE 802.11p, and the IEEE 1609 standard series. Key Features: Covers the state-of-the-art in the field of vehicular inter-networks such as safety and efficiency applications, physical and medium access control layer issues, middleware, and security Shows how vehicular networks differ from other mobile networks and illustrates the idea of vehicle-to-vehicle communications with application scenarios and with current proofs of concept worldwide Addresses current standardization activities such as IEEE 802.11p and the IEEE 1609 standard series Offers a chapter on mobility models and their use for simulation of vehicular inter-networks Provides a coherent treatment of the important topics and technologies contributed by leading academic and industry experts in the field This book provides a reference for professional automotive technologists (OEMS and suppliers), professionals in the area of Intelligent Transportation Systems, and researchers attracted to the field of wireless vehicular communications. Third and fourth year undergraduate and graduate students will also find this book of interest. For additional information please visit http://www.vanetbook.com
Download or read book Wireless Network Design written by Jeff Kennington and published by Springer Science & Business Media. This book was released on 2010-11-10 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book surveys state-of-the-art optimization modeling for design, analysis, and management of wireless networks, such as cellular and wireless local area networks (LANs), and the services they deliver. The past two decades have seen a tremendous growth in the deployment and use of wireless networks. The current-generation wireless systems can provide mobile users with high-speed data services at rates substantially higher than those of the previous generation. As a result, the demand for mobile information services with high reliability, fast response times, and ubiquitous connectivity continues to increase rapidly. The optimization of system performance has become critically important both in terms of practical utility and commercial viability, and presents a rich area for research. In the editors' previous work on traditional wired networks, we have observed that designing low cost, survivable telecommunication networks involves extremely complicated processes. Commercial products available to help with this task typically have been based on simulation and/or proprietary heuristics. As demonstrated in this book, however, mathematical programming deserves a prominent place in the designer's toolkit. Convenient modeling languages and powerful optimization solvers have greatly facilitated the implementation of mathematical programming theory into the practice of commercial network design. These points are equally relevant and applicable in today’s world of wireless network technology and design. But there are new issues as well: many wireless network design decisions, such as routing and facility/element location, must be dealt with in innovative ways that are unique and distinct from wired (fiber optic) networks. The book specifically treats the recent research and the use of modeling languages and network optimization techniques that are playing particularly important and distinctive roles in the wireless domain.
Download or read book Cloud and IoT Based Vehicular Ad Hoc Networks written by Gurinder Singh and published by John Wiley & Sons. This book was released on 2021-06-05 with total page 434 pages. Available in PDF, EPUB and Kindle. Book excerpt: CLOUD AND IOT-BASED VEHICULAR AD HOC NETWORKS This book details the architecture behind smart cars being fitted and connected with vehicular cloud computing, IoT and VANET as part of the intelligent transport system (ITS). As technology continues to weave itself more tightly into everyday life, socioeconomic development has become intricately tied to ever-evolving innovations. An example of this is the technology being developed to address the massive increase in the number of vehicles on the road, which has resulted in more traffic congestion and road accidents. This challenge is being addressed by developing new technologies to optimize traffic management operations. This book describes the state-of-the-art of the recent developments of Internet of Things (IoT) and cloud computing-based concepts that have been introduced to improve Vehicular Ad-Hoc Networks (VANET) with advanced cellular networks such as 5G networks and vehicular cloud concepts. 5G cellular networks provide consistent, faster and more reliable connections within the vehicular mobile nodes. By 2030, 5G networks will deliver the virtual reality content in VANET which will support vehicle navigation with real time communications capabilities, improving road safety and enhanced passenger comfort. In particular, the reader will learn: A range of new concepts in VANETs, integration with cloud computing and IoT, emerging wireless networking and computing models New VANET architecture, technology gap, business opportunities, future applications, worldwide applicability, challenges and drawbacks Details of the significance of 5G Networks in VANET, vehicular cloud computing, edge (fog) computing based on VANET. Audience The book will be widely used by researchers, automotive industry engineers, technology developers, system architects, IT specialists, policymakers and students.
Download or read book Backpacker written by and published by . This book was released on 2001-03 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt: Backpacker brings the outdoors straight to the reader's doorstep, inspiring and enabling them to go more places and enjoy nature more often. The authority on active adventure, Backpacker is the world's first GPS-enabled magazine, and the only magazine whose editors personally test the hiking trails, camping gear, and survival tips they publish. Backpacker's Editors' Choice Awards, an industry honor recognizing design, feature and product innovation, has become the gold standard against which all other outdoor-industry awards are measured.
Download or read book NASA SP 7500 written by United States. National Aeronautics and Space Administration and published by . This book was released on 1982 with total page 814 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Human Factors in Architecture Sustainable Urban Planning and Infrastructure written by Alicja Maciejko and published by AHFE Conference. This book was released on 2024-07-24 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of the 15th International Conference on Applied Human Factors and Ergonomics and the Affiliated Conferences, Nice, France, 24-27 July 2024.
