Download or read book Scheduling and QoS Enhancement in Wireless Vehicular Ad hoc Networks written by Lusheng Miao and published by . This book was released on 2014 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt: Discusses the protocol design in VANETs is very challenging due to their low latency and high data rate requirements in a high mobility environment. Hence, the central metrics of QoS such as throughput, reliability and delays are critical to the design of protocol in VANETs. Therefore, this project focuses on the scheduling and QoS enhancement algorithms. The QoS analytical model and multi-channel MAC protocol were completed; this was significant for the development of the VANETs.The anticipated benefits of this study may be described as: 1. The duty cycle adaptive MAC protocol could improve the QoS of VANET in the situation where the OBU is equipped with only one transceiver. 2. The results obtained from this model is significant for the designing and evaluation of the vehicular network. 3. Due to the characteristics of VANETs, the requirements of high throughput and low latency are critical in VANETs. An efficient multi-channel MAC protocol is a vital requirement in order to offer efficient, fair and stable channel access using the limited channel resources.

Download or read book QoS Enhancement in Wireless Multi hop Ad Hoc Networks written by Oussama Alsabek and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Provision Quality of service Controlled Content Distribution in Vehicular Ad Hoc Networks written by Hao Luan and published by . This book was released on 2012 with total page 153 pages. Available in PDF, EPUB and Kindle. Book excerpt: By equipping vehicles with the on-board wireless facility, the newly emerged vehicular networking targets to provision the broadband serves to vehicles. As such, a variety of novel and exciting applications can be provided to vehicular users to enhance their road safety and travel comfort, and finally raise a complete change to their on-road life. As the content distribution and media/video streaming, such as Youtube, Netflix, nowadays have become the most popular Internet applications, to enable the efficient content distribution and audio/video streaming services is thus of the paramount importance to the success of the vehicular networking. This, however, is fraught with fundamental challenges due to the distinguished natures of vehicular networking. On one hand, the vehicular communication is challenged by the spotty and volatile wireless connections caused by the high mobility of vehicles. This makes the download performance of connections very unstable and dramatically change over time, which directly threats to the on-top media applications. On the other hand, a vehicular network typically involves an extremely large-scale node population (e.g., hundreds or thousandths of vehicles in a region) with intense spatial and temporal variations across the network geometry at different times. This dictates any designs to be scalable and fully distributed which should not only be resilient to the network dynamics, but also provide the guaranteed quality-of-service (QoS) to users. The purpose of this dissertation is to address the challenges of the vehicular networking imposed by its intrinsic dynamic and large-scale natures, and build the efficient, scalable and, more importantly, practical systems to enable the cost-effective and QoS guaranteed content distribution and media streaming services to vehicular users. Note that to effective- ly deliver the content from the remote Internet to in-motion vehicles, it typically involves three parts as: 1.) an infrastructure grid of gateways which behave as the data depots or injection points of Internet contents and services to vehicles, 2.) protocol at gateways which schedules the bandwidth resource at gateways and coordinates the parallel transmissions to different vehicles, and 3.) the end-system control mechanism at receivers which adapts the receiver's content download/playback strategy based on the available network throughput to provide users with the desired service experience. With above three parts in mind, the entire research work in this dissertation casts a systematic view to address each part in one topic with: 1.) design of large-scale cost-effective content distribution infrastructure, 2.) MAC (media access control) performance evaluation and channel time scheduling, and 3.) receiver adaptation and adaptive playout in dynamic download environment. In specific, in the first topic, we propose a practical solution to form a large-scale and cost-effective content distribution infrastructure in the city. We argue that a large-scale infrastructure with the dedicated resources, including storage, computing and communication capacity, is necessary for the vehicular network to become an alternative of 3G/4G cellular network as the dominating approach of ubiquitous content distribution and data services to vehicles. On addressing this issue, we propose a fully distributed scheme to form a large-scale infrastructure by the contributions of individual entities in the city, such as grocery stores, movie theaters, etc. That is to say, the installation and maintenance costs are shared by many individuals. In this topic, we explain the design rationale on how to motivate individuals to contribute, and specify the detailed design of the system, which is embodied with distributed protocols and performance evaluation. The second topic investigates on the MAC throughput performance of the vehicle-to- infrastructure (V2I) communications when vehicles drive through RSUs, namely drive-thru Internet. Note that with a large-scale population of fast-motion nodes contending the chan- nel for transmissions, the MAC performance determines the achievable nodal throughput and is crucial to the on-top applications. In this topic, using a simple yet accurate Marko- vian model, we first show the impacts of mobility (characterized by node velocity and moving directions) on the nodal and system throughput performance, respectively. Based on this analysis, we then propose three enhancement schemes to timely adjust the MAC parameters in tune with the vehicle mobility to achieve the maximal the system throughput. The last topic investigates on the end-system design to deliver the user desired media streaming services in the vehicular environment. In specific, the vehicular communications are notoriously known for the intermittent connectivity and dramatically varying throughput. Video streaming on top of vehicular networks therefore inevitably suffers from the severe network dynamics, resulting in the frequent jerkiness or even freezing video playback. To address this issue, an analytical model is first developed to unveil the impacts of network dynamics on the resultant video performance to users in terms of video start-up delay and smoothness of playback. Based on the analysis, the adaptive playout buffer mechanism is developed to adapt the video playback strategy at receivers towards the user-defined video quality. The proposals developed in the three topics are validated with the extensive and high fidelity simulations. We believe that our analysis developed in the dissertation can provide insightful lights on understanding the fundamental performance of the vehicular content distribution networks from the aspects of session-level download performance in urban vehicular networks (topic 1), MAC throughput performance (topic 2), and user perceived media quality (topic 3). The protocols developed in the three topics, respectively, offer practical and efficient solutions to build and optimize the vehicular content distribution networks.

Download or read book Wireless Network Traffic and Quality of Service Support Trends and Standards written by Lagkas, Thomas D. and published by IGI Global. This book was released on 2010-03-31 with total page 572 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This book offers cutting edge approaches for the provision of quality of service in wireless local area networks"--Provided by publisher.

Download or read book Traffic and QoS Management in Wireless Multimedia Networks written by Yevgeni Koucheryavy and published by Springer Science & Business Media. This book was released on 2009-04-20 with total page 319 pages. Available in PDF, EPUB and Kindle. Book excerpt: The current book provides a final report of activity performed by the COST 290 Action, ‘‘Traffic and QoS Management in Wireless Multimedia Networks,’’ which ran from March 10, 2004, until June 3, 2008. After an introduction to the COST framework and the Action’s survey time-frame and activities, the main part of the book addresses a number of technical issues, which are structured into several chapters. All those issues have been carefully investigated by the COST 290 community during the course of the project – the information presented in this book can be regarded as ultimate for each particular topic; every open research issue addressed in the book is described carefully, corresponding existing studies are analyzed and results achieved by the COST 290 community are presented and compared, and further research directions are defined and analyzed. Because the book covers a wide area of research addressing issues of modern wired and wireless networking at different layers, starting from the physical layer up to the application layer, it can be recommended to be used by researchers and students to obtain a comprehensive analysis on particular research topics including related areas, to obtain broad and ultimate referencing, and to be advised on current open issues. COST 290 is one of the Actions of the European COST Program. Founded in 1971, COST is an intergovernmental framework for European Cooperation in the field of Scientific and Technical Research, allowing the coordination of nationally funded research on a European level.

Download or read book Exploring QoS and Security in Wireless Ad hoc Network written by Donglai Sun and published by . This book was released on 2012 with total page 107 pages. Available in PDF, EPUB and Kindle. Book excerpt: Wireless Ad-hoc Network is an emerging communication technology over the last decade. As this kind of network can be easily implemented without requiring fixed infrastructures, it is considered as one of the most important solutions for building distributed wireless systems. Obviously, the physical channel in wireless ad-hoc network significantly distinguishes itself from the other existing networks. For example, fluctuations caused by unstable wireless channel are more severe. From an ordinaryperspective, these characteristics are treated as disadvantages, and have to be eliminated in network design.Burgeoning technology called physical layer security represents a completely subversive attitude to these issues. Unique physical channel is exploited to provide additional security guarantee. However, new problems are also introduced into the system. Transmission rate of links with physical layer security is largely restricted due to the overhead used for secure mechanism. Network performance (e.g., throughput and delay) is accordingly affected. Thus, QoS turns out to be a major concern innetworks with physical layer security. In this research, the focus is on the problem of how to guarantee QoS and physicallayer security simultaneously in wireless ad-hoc networks. Since traditional solutions for QoS are always implemented in upper layers of the network structure, they can hardly provide full support to the new secure physical layer. Furthermore, as services without secure requirement still exist in the network, the coexistence of secure and regular physical layer has to be taken into consideration. These issues have set new demands of corresponding MAC layer scheduling protocols. Therefore, we summarizethe general characteristics of physical layer security technology, based on which SecDCF, a MAC layer scheduling framework is presented. An interface is also designed to enable the integration of different scheduling policies. Furthermore, diversifiedrequirements from different scenarios are studied, and scheduling policies are then derived to be applied with SecDCF.Corresponding numerical analysis and simulations are also carried out to evaluate our research. As a conclusion, it is illustrated in this dissertation that with elaborately designed MAC layer scheduling schemes, it is possible to exploit the rich physical layercharacteristics for achieving both security and QoS in wireless ad-hoc networks.

Download or read book Quality of Service Architectures for Wireless Networks Performance Metrics and Management written by Adibi, Sasan and published by IGI Global. This book was released on 2010-01-31 with total page 716 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This book further explores various issues and proposed solutions for the provision of Quality of Service (QoS) on the wireless networks"--Provided by publisher.

Download or read book Scheduling in Wireless Networks written by Anna Pantelidou and published by Now Publishers Inc. This book was released on 2011 with total page 101 pages. Available in PDF, EPUB and Kindle. Book excerpt: Reviews the problem of scheduled channel access in wireless networks with emphasis on ad hoc and sensor networks as opposed to WiFi, cellular, and infrastructure-based networks. It is intended to provide a reference point for the rich set of problems that arise in the allocation of resources in modern and future networks.

Download or read book Testbed Implementation of QoS Routing Enhancements for Wireless Ad Hoc Networks written by Melvin Ferreira and published by . This book was released on 2009 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt: AODV -- Delay metric -- Implementation -- QoS routing protocols -- Wireless ad hoc networks -- Wireless testbed -- Vertraging metriek -- Implementering -- Kwaliteit van diens -- Roetebepalingsprotokol -- Draadlose ad hoc netwerke -- Draadlose toetsbank.

Download or read book QoS Routing Algorithms for Wireless Sensor Networks written by K. R. Venugopal and published by Springer Nature. This book was released on 2020-02-28 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a systematic introduction to the fundamental concepts, major challenges, and effective solutions for Quality of Service in Wireless Sensor Networks (WSNs). Unlike other books on the topic, it focuses on the networking aspects of WSNs, discussing the most important networking issues, including network architecture design, medium access control, routing and data dissemination, node clustering, node localization, query processing, data aggregation, transport and quality of service, time synchronization, and network security. Featuring contributions from researchers, this book strikes a balance between fundamental concepts and new technologies, providing readers with unprecedented insights into WSNs from a networking perspective. It is essential reading for a broad audience, including academics, research engineers, and practitioners, particularly postgraduate/postdoctoral researchers and engineers in industry. It is also suitable as a textbook or supplementary reading for graduate computer engineering and computer science courses.

Download or read book Scheduling for Energy Conservation and Quality Enhancement in Multi hop Wireless Networks written by Ashima Gupta and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Wireless networks and devices are ubiquitous today. This is primarily due to the increased mobility, flexibility and connectivity as well as high speed and low cost deployment that they provide. However quality of service, capacity, spectral efficiency and battery lifetime are some major concerns of wireless devices and networks. The broadcast nature of wireless media makes them prone to losses and high bit error rates. These variabilities make it challenging to guarantee quality of service parameters like rate, latency and jitter. Wireless devices consume more power than corresponding wired devices. These devices function on limited battery capacity to facilitate portability and mobility. Hence, their operational lifecycle is governed by the efficiency of their battery usage. The objective of this thesis is to analyze and apply novel application aware cross-layer scheduling techniques for energy conservation and quality enhancement in multi-hop wireless networks. We focus on scheduling techniques as many of these can integrated with existing systems and incorporated in new designs. Application awareness helps to identify the constraints and requirements at lower network layers (network and MAC layer). This facilitates the lower layers to perform prioritized scheduling to optimize bandwidth utilization for class differentiated flows and devise adaptive sleep-awake scheduling while minimizing the impact on quality of service. Specifically, we identify three applications: OFDMA based multi-hop networks, Sensor networks and Voice over Internet Protocol (VoIP). We model QoS aware centralized slot allocation scheme for prioritized flows in OFDMA based networks as an ILP that maximizes the described Flow Admittance metric. Several computationally tractable heuristics are compared for efficiency using different topologies and workloads. We enhance this solution for IEEE 802.16j networks making it scalable and adaptive to rate changes and link demands. We illustrate how a multi-channel sensor network scheduling scheme results in considerable energy savings when used to model a moving phenomenon or to deploy a heterogeneous sensor network. This is achieved without significant degradation in data gathering: quality or latency. Finally, we show how an adaptive scanning technique utilizing the sleep-awake scheduling in Wi-Fi networks is used to conserve energy and increase battery lifetime in VoIP Wi-Fi devices.

Download or read book Achievable QoS and Scheduling Policies for Integrated Services Wireless Networks written by Jeffrey M. Capone and published by . This book was released on 1997 with total page 194 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Applications of Artificial Intelligence and Machine Learning written by Bhuvan Unhelker and published by Springer Nature. This book was released on 2022-09-13 with total page 792 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book presents a collection of peer-reviewed articles from the International Conference on Advances and Applications of Artificial Intelligence and Machine Learning—ICAAAIML 2021. The book covers research in the areas of artificial intelligence, machine learning, and deep learning applications in health care, agriculture, business, and security. This book contains research papers from academicians, researchers as well as students. There are also papers on core concepts of computer networks, intelligent system design and deployment, real-time systems, wireless sensor networks, sensors and sensor nodes, software engineering, and image processing. This book is a valuable resource for students, academics, and practitioners in the industry working on AI applications.

Download or read book QoS Support in Large Scale Computer Networks Based on Aggregate Scheduling and BGP Routing Enhancement written by Wei Sun and published by . This book was released on 2007 with total page 344 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Muiti layer Optimization in Wireless Ad Hoc Networks written by and published by . This book was released on 2007 with total page 129 pages. Available in PDF, EPUB and Kindle. Book excerpt: The growing prevalence of wireless ad hoc networks calls for an innovative design to support Quality of Service (QoS) while maintaining high energy efficiency and bandwidth efficiency. In this dissertation, a multi-layer optimization approach is developed in view of benefits and necessities of sharing information among different layers. Specifically, given the traffic demands with QoS requirements, how to jointly design physical, MAC and network layers to optimize the network performance is considered in this dissertation. Firstly, a joint power control and maximally disjoint multipath routing scheme is proposed for QoS provisioning of end-to-end traffic with minimum rate constraint. A framework of power control with QoS constraints is introduced and both centralized and distributed solutions are derived. It is demonstrated by simulations that the proposed scheme provides high energy efficiency and the prolonged network lifetime, as well as robustness when augmented with a dynamic traffic monitoring and switching mechanism. In order to fulfill the QoS requirement at the link layer, TD/CDMA has been chosen as the MAC scheme due to its support for a high network throughput in a multihop environment. The multi-link versions of proportional fair and throughput optimal scheduling algorithms are proposed for multihop wireless ad hoc networks. In addition, a generic token counter mechanism is employed to satisfy the minimum and maximum rate requirements. Approximative algorithms are suggested to reduce the computational complexity. In networks that lack centralized control, distributed scheduling algorithms are derived and fully distributed implementations are provided. Simulation results demonstrate the effectiveness of the proposed schemes. In order to further improve bandwidth efficiency, cognitive radio is considered for more efficient spatial and temporal spectrum sharing. Specifically, we consider the scenario where a cognitive radio ad hoc network is formed by low power personal/portable devices operating simultaneously in the same frequency band along with a legacy system. A power control problem is formulated to maximize the energy efficiency of the ad hoc network, as well as to guarantee QoS for both legacy network users and ad hoc network users. The results show that cognitive radio greatly improves bandwidth efficiency of wireless ad hoc networks.

Download or read book Distributed Medium Access Control for QoS Support in Wireless Networks written by Ping Wang and published by . This book was released on 2008 with total page 153 pages. Available in PDF, EPUB and Kindle. Book excerpt: With the rapid growth of multimedia applications and the advances of wireless communication technologies, quality-of-service (QoS) provisioning for multimedia services in heterogeneous wireless networks has been an important issue and drawn much attention from both academia and industry. Due to the hostile transmission environment and limited radio resources, QoS provisioning in wireless networks is much more complex and difficult than in its wired counterpart. Moreover, due to the lack of central controller in the networks, distributed network control is required, adding complexity to QoS provisioning. In this thesis, medium access control (MAC) with QoS provisioning is investigated for both single- and multi-hop wireless networks including wireless local area networks (WLANs), wireless ad hoc networks, and wireless mesh networks. Originally designed for high-rate data traffic, a WLAN has limited capability to support delay-sensitive voice traffic, and the service for voice traffic may be impacted by data traffic load, resulting in delay violation or large delay variance. Aiming at addressing these limitations, we propose an efficient MAC scheme and a call admission control algorithm to provide guaranteed QoS for voice traffic and, at the same time, increase the voice capacity significantly compared with the current WLAN standard. In addition to supporting voice traffic, providing better services for data traffic in WLANs is another focus of our research.

Download or read book QOS Enhancement of Wireless Sensor Network written by Gurjot Singh and published by . This book was released on 2016-04-23 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt: