Download or read book Vertical Handovers in Heterogeneous Network Environments written by Thikrait Al Mosawi and published by . This book was released on 2009 with total page 284 pages. Available in PDF, EPUB and Kindle. Book excerpt: Heterogeneous networks require a mechanism for enabling seamless handover between different access technologies. For real-time services, such as voice and video, the Session Initiation Protocol (SIP) is becoming the leading signalling protocol in IP networks and has already been accepted as the signalling standard in 3G wireless systems. However, existing proposals for supporting mobility with SIP are not sufficient to support terminal-mobility, as they do not take into account the effect of lower layer triggers on the handover detection and decision. The IEEE 802.21 standard defines the MIH (Media Independent Hand over) mechanism that offers advanced services for handover such as event notification, layer 2 handover commands, and information on available networks. In this thesis, a combination of the IEEE 802.21 MIH Function (MIHF) with the SIP mechanism is proposed to provide a fast and efficient handover solution. The proposed architecture and the signalling mechanisms are modelled using the OPNET network simulation tool. -- This thesis first provides an overview of the proposed architecture for vertical handover technique that is based on the MIH and SIP. An MIH-capable Mobile Node (MN) and a network architecture are developed. A handover manager at the MN is also introduced; its main function is to co-ordinate and manage the MIH services. -- Attention is then turned to the case of the Mobile Node-controlled handover. In this case, a predicative link trigger algorithm for seamless vertical handover in heterogeneous wireless networks is proposed and modelled. The results reveal that a timely link layer trigger to initiate the handover can significantly influence the handover performance in terms of packet loss and handover delay.

Download or read book Intelligent Vertical Handover Management in Heterogeneous Wireless Networks written by Ammar Haider and published by . This book was released on 2013 with total page 310 pages. Available in PDF, EPUB and Kindle. Book excerpt: The upcoming generation of wireless networks are characterized by seamless mobility across wireless access networks belonging to different radio access technologies. This requires the heterogeneous access networks to be integrated together, and the mobile terminals to be equipped with multiple radio interfaces allowing the users to roam across different networks. Vertical Handover (VHO) is the process of transparent switching from one access network to other. To achieve seamless heterogeneous mobility, simple, robust and effective vertical handover mechanisms must be devised. The entire vertical handover process can by divided into three stages: VHO Preparation, VHO Decision and VHO Execution. Ideally, a vertical handover should complete without causing any disruption in the communication and with a minimum overhead on the network. To achieve these goals, each of the three stages in VHO should be individually optimized. This research aims to devise a vertical handover implementation that performs as close to ideal behaviour as possible. For this purpose, we have proposed new or enhanced algorithms corresponding to all three VHO stages. A heterogeneous network model comprises of two major types of networks - cellular networks with wide coverage areas, and wireless local area networks (WLAN) with small coverage but providing higher bandwidth at a lower cost. To optimize the VHO preparation phase, we have developed a hybrid vertical handoff method for maximizing WLAN utilization in a WLAN-cellular integrated environment. We accurately determine the timing instants for initiation of vertical handover for the mobile terminals that enter the WiFi hotspots, stay there for some time and then leave the area. The proposed method ensures that transition between cellular and WiFi networks should be with minimum disruption while utilizing WiFi signals for as long as possible. As a result, the mobile nodes get advantages of lowest probability of handover failure and minimum number of unnecessary handovers. The second phase, VHO decision should incorporate multiple parameters to select the best network from a list of available candidate networks. The list of possible decision metrics includes link quality, system QoS parameters, user preferences, monetary cost, application type, movement speed etc. To arrive at a unified decision, as per our proposal, the best candidate network is chosen by employing a multiple-criteria decision making algorithm named PROMETHEE. This approach yields the desired benefit of providing better QoS experience to end users. For the third phase in vertical handover (VHO execution), we have focussed on the specific admission control problem. We have introduced concepts from Online Social Networking (OSN) Sites into admission control and handoff scenarios, by use of OSN proxy servers running on WLAN access points. Because of an ever-increasing popularity of OSNs this solution hold a lot of potential. Using the access points as OSN proxy servers leads to a substantial localization of social network traffic within WLAN which is a great advantage when considered globally. We have formulated and evaluated a Social-Connectivity-aware Vertical Handover (SCVH) algorithm for efficient dissemination of social network feeds. This algorithm introduces a novel measure of social importance of users requesting for admission to WLAN by calculating their 'graph centrality' measures. According to our proposed SCVH, users with high importance value are given a high priority for handover to WLAN network. Performance evaluation of our proposed techniques is carried out in a network simulation environment which models a heterogeneous network scenario. The simulation results demonstrate that our proposed schemes are successful in optimizing VHO performance, which should result in a nearly seamless handover across heterogeneous wireless networks.

Download or read book Next Generation Wireless Networks written by Sirin Tekinay and published by Springer Science & Business Media. This book was released on 2001 with total page 267 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is an organized and edited work of enabling technologies for the applications and services needed for future wireless networks. Its focus is the defining architectures, services and applications, with coverage of all layers, i.e., from the physical layer to the information handling layers of the network. The new wireless network architectures are geared specifically for enabling mobility and location-enhanced applications. Presented first are tutorials on new network architectures, including a discussion of "infostations", the role of satellites in broadband wireless access, and the "infocity" concept. The next three chapters present material that describes the state-of-the-art in wireless geolocation systems (including "assisted GPS"), alternatives for wireless geolocation, and empirical data on wireless geolocation capabilities. The first of the last two chapters demonstrates the use of location information in next generation wireless networks, with coverage of real-time geolocation measurements in mobile connectivity. The final chapter portrays the creation of a "killer application" in wireless networks. Leading researchers in the field have contributed to this volume. Next Generation Wireless Networks is essential reading for engineers, researchers, application design specialists, and product managers in the field of wireless network architectures and wireless geolocation.

Download or read book Mobility Management and Vertical Handover Decision Making in Heterogeneous Wireless Networks written by Mariem Zekri and published by . This book was released on 2012 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mobility management over heterogeneous wireless networks is becoming a major interest area as new technologies and services continue to proliferate within the wireless networking market. In this context, seamless mobility is considered to be crucial for ubiquitous computing. Service providers aim to increase the revenue and to improve users' satisfaction. However there are still many technical and architectural challenges to overcome before achieving the required interoperability and coexistence of heterogeneous wireless access networks. Indeed, the context of wireless networks is offering multiple and heterogeneous technologies (e.g. 2G to 4G, WiFi, Wimax, TETRA,...). On the one hand, this rich environment allows users to take profit from different capacities and coverage characteristics. Indeed, this diversity can provide users with high flexibility and allow them to seamlessly connect at any time and any where to the access technology that best fits their requirements. Additionally, cooperation between these different technologies can provide higher efficiency in the usage of the scarce wireless resources offering more economic systems for network providers. On the other hand, the heterogeneity of technologies and architectures and the multiplication of networks and service providers creates a complex environment where cooperation becomes challenging at different levels including and not limited to mobility management, radio resource provisioning, Quality of Service and security guarantees. This thesis is focusing on mobility management and mainly on decision making for Vertical handover within heterogeneous wireless network environments. After the analysis of the related state of the art, we first propose a reputation based approach that allows fast vertical handover decision making. A decision making scheme is then built on that approach. Network's reputation, is a new metric that can be gathered from previous users' experiences in the networks. We show that it is an efficient construct to speed up the vertical handover decision making thanks to anticipation functionalities. While the main objective remains guaranteeing the best Quality of Service and optimal radio resource utilization, economical aspects have also to be considered including cost minimization for users and revenue maximization for network providers. For this aim, we propose, in the second part of the thesis, a game theoretic based scheme that allows maximizing benefits for both networks and users. In this solution, each available network plays a Stackelberg game with a finite set of users, while users are playing a Nash game among themselves to share the limited radio resources. A Nash equilibrium point, that maximizes the user's utility and the service provider revenue, is found and used for admission control and vertical handover decision making. The analyses of the optimal bandwidth/prices and the revenue at the equilibrium point show that there are some possible policies to use according to user's requirements in terms of QoS and to network capacities. For instance, we pointed out that networks having same capacities and different reputation values should charge users with different prices which makes reputation management very important to attract users and maximize networks' revenue. In the third part of this thesis, we provide and discuss two different architectural and implementation solutions on which our proposed vertical handover decision mechanisms can be integrated. The first proposed architecture is a centralized one. It is based on the IEEE 802.21 standard to which some extensions are proposed. The second proposed architecture is distributed. It is based on an overlay control level composed of two virtualization layers able to make reasoning on behalf of physical entities within the system. This architecture allows higher flexibility especially for loosely coupled interconnected networks.

Download or read book Quality of Service in Heterogeneous Mobile and Wireless Networks written by Kire Jakimoski and published by LAP Lambert Academic Publishing. This book was released on 2013 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt: Multi-access mobile devices and overlapping mobile and wireless network deployments have emerged as a reality in the converged telecommunications world. In heterogeneous wireless and mobile environment it is highly important to provide QoS support and seamless handovers between different radio access networks, something that is particularly needed for real-time services. Therefore, this book provides performance analysis of packet scheduling algorithms for cellular mobile networks and for WiMAX. Also, it provides QoS analysis of vertical handover for VoIP and video traffic in a heterogeneous wireless environment. Further, the book proposes improvements for vertical handover decision algorithms regarding the QoS provisioning in mobile and wireless heterogeneous networks, accompanied with numerical analysis and radio access technology selection algorithm. Finally, it gives important discussions and conclusions for improving the QoS in heterogeneous mobile and wireless networks. Hence, this book is useful for all professionals in mobile and wireless networking and to everyone else who is interested in this field of science.

Download or read book Efficient Integration of 5G and Beyond Heterogeneous Networks written by Zi-Yang Wu and published by Springer Nature. This book was released on 2020-08-26 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book discusses the smooth integration of optical and RF networks in 5G and beyond (5G+) heterogeneous networks (HetNets), covering both planning and operational aspects. The integration of high-frequency air interfaces into 5G+ wireless networks can relieve the congested radio frequency (RF) bands. Visible light communication (VLC) is now emerging as a promising candidate for future generations of HetNets. Heterogeneous RF-optical networks combine the high throughput of visible light and the high reliability of RF. However, when implementing these HetNets in mobile scenarios, several challenges arise from both planning and operational perspectives. Since the mmWave, terahertz, and visible light bands share similar wave propagation characteristics, the concepts presented here can be broadly applied in all such bands. To facilitate the planning of RF-optical HetNets, the authors present an algorithm that specifies the joint optimal densities of the base stations by drawing on stochastic geometry in order to satisfy the users’ quality-of-service (QoS) demands with minimum network power consumption. From an operational perspective, the book explores vertical handovers and multi-homing using a cooperative framework. For vertical handovers, it employs a data-driven approach based on deep neural networks to predict abrupt optical outages; and, on the basis of this prediction, proposes a reinforcement learning strategy that ensures minimal network latency during handovers. In terms of multi-homing support, the authors examine the aggregation of the resources from both optical and RF networks, adopting a two-timescale multi-agent reinforcement learning strategy for optimal power allocation. Presenting comprehensive planning and operational strategies, the book allows readers to gain an in-depth grasp of how to integrate future coexisting networks at high-frequency bands in a cooperative manner, yielding reliable and high-speed 5G+ HetNets.

Download or read book An Intelligent Vertical Handoff Decision Algorithm written by Sureshkumar V. and published by LAP Lambert Academic Publishing. This book was released on 2014 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt: The next generation wireless networks (NGWN) should be compatible with other communication technologies to offer the best connectivity to the mobile terminal, which can access any IP based services at any time from any network without the knowledge of its user. It requires an intelligent vertical handover decision making algorithm to migrate between technologies that enable seamless mobility, redundant best connection and minimal terminal power consumption. Currently existing decision engines are simple, proprietary, and its handover is only based on the received signal strength which has been proven unintelligent. The proposed decision algorithm in this book gains intelligence by combining fuzzy logic system to handle imprecise data, multiple attribute decision making to handle multiple attributes for decision making, and context aware strategies to reduce unnecessary handover. It also detects new network which offers best connectivity than current network and does authentication, and mobile IP registration before making the handover; thereby reducing the packet loss to ensure high quality of service.

Download or read book Design of Efficient Vertical Handover in Heterogeneous Networks written by Amandeep Singh Sandhu and published by . This book was released on 2016-10-11 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Wireless Multi Access Environments and Quality of Service Provisioning Solutions and Application written by Muntean, Gabriel-Miro and published by IGI Global. This book was released on 2012-01-31 with total page 429 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This book serves as a vital resource for practitioners to learn about the latest research and methodology within the field of wireless technology, covering important aspects of emerging technologies in the heterogeneous next generation network environment with a focus on wireless communications and their quality"--Provided by publisher.

Download or read book Instrumentation Measurement Circuits and Systems written by Tianbiao Zhang and published by Springer Science & Business Media. This book was released on 2012-03-09 with total page 988 pages. Available in PDF, EPUB and Kindle. Book excerpt: The volume includes a set of selected papers extended and revised from the 2011 International Conference on Mechanical Engineering and Technology, held on London, UK, November 24-25, 2011. Mechanical engineering technology is the application of physical principles and current technological developments to the creation of useful machinery and operation design. Technologies such as solid models may be used as the basis for finite element analysis (FEA) and / or computational fluid dynamics (CFD) of the design. Through the application of computer-aided manufacturing (CAM), the models may also be used directly by software to create "instructions" for the manufacture of objects represented by the models, through computer numerically controlled (CNC) machining or other automated processes, without the need for intermediate drawings. This volume covers the subject areas of mechanical engineering and technology, and also covers interdisciplinary subject areas of computers, communications, control and automation. We hope that researchers, graduate students and other interested readers benefit scientifically from the book and also find it stimulating in the process.

Download or read book Optimizations for Vertical Handoff in Next Generation Wireless Networks written by Fang Zhu and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: ABSTRACT: Next generation wireless networks will be based on the coordination of different types of networks in a heterogeneous environment. A significant challenge for coordination is vertical handoff that ensures mobile users' seamless mobility and ubiquitous access to applications across heterogeneous networks.

Download or read book Proceedings of the 2nd International Conference on Data Engineering and Communication Technology written by Anand J. Kulkarni and published by Springer. This book was released on 2018-10-03 with total page 695 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book features research work presented at the 2nd International Conference on Data Engineering and Communication Technology (ICDECT) held on December 15–16, 2017 at Symbiosis International University, Pune, Maharashtra, India. It discusses advanced, multi-disciplinary research into smart computing, information systems and electronic systems, focusing on innovation paradigms in system knowledge, intelligence and sustainability that can be applied to provide feasible solutions to varied problems in society, the environment and industry. It also addresses the deployment of emerging computational and knowledge transfer approaches, optimizing solutions in a variety of disciplines of computer science and electronics engineering.

Download or read book Protocols and Systems for Interactive Distributed Multimedia written by Fernando Boavida and published by Springer. This book was released on 2003-08-02 with total page 386 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book constitutes the refereed proceedings of the Joint International Workshops on Interactive Distributed Multimedia Systems and Protocols for Multimedia Systems, IDMS/PROMS 2002, held in Coimbra, Portugal in November 2002.The 30 revised full papers presented were carefully reviewed and selected from 112 submissions. The papers are organized in topical sections on performance of protocols and applications, mobile multimedia systems, standards and related issues, quality of service, video systems and applications, resource management, and multimedia support.

Download or read book Handbook of Research on Wireless Multimedia Quality of Service and Solutions written by Cranley, Nicola and published by IGI Global. This book was released on 2008-07-31 with total page 544 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This book highlights and discusses the underlying QoS issues that arise in the delivery of real-time multimedia services over wireless networks"--Provided by publisher.

Download or read book Mobile Networks and Management written by Dirk Pesch and published by Springer. This book was released on 2013-12-17 with total page 298 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book constitutes the post-proceedings of the 5th International ICST Conference on Mobile Networks and Management, MONAMI 2013, held in Cork, Ireland, in September 2013. The 18 revised full papers presented were carefully reviewed and selected from numerous submissions. The volume is organized thematically in five parts, covering: TCP, multi-path and coding and content-centric networking; mobile networks; wireless sensor and vehicular networks; wireless communications and traffic; future research directions, including cloud connectivity, orchestration and SDN.

Download or read book Comprehensive Guide to Heterogeneous Networks written by Kiran Ahuja and published by Academic Press. This book was released on 2022-09-20 with total page 338 pages. Available in PDF, EPUB and Kindle. Book excerpt: Comprehensive Guide to Heterogeneous Networks discusses the fundamental motivations behind this cutting-edge development, along with a brief discussion on the diverse definitions of HNs. The future of heterogeneous wireless networks (HWNs) is covered, including test cases, cost configuration, economic benefits and basic challenges. Other sections cover the topology management method in context of heterogeneous sensor nodes with diverse communication and sensing range. In addition, an outline of the pros and cons of the clustering criteria in HWSNs and taxonomy are summarized and provide futuristic research directions. Final sections discuss the future evolution of HNs and their implementations in diverse applications. This is an essential reference book for advanced students on courses in wireless communications, clinical engineering and networking. It will also be of interest to researchers, network planners, technical mangers and other professionals in these fields. Discusses the most important problems, challenges and issues which arise when designing real-time heterogeneous networks for diverse scenarios Represents the unique features of heterogeneous sensor networks, giving the end-user a better understanding of the environment Provides an overview of real-time performance issues in heterogeneous networks, specifically multi-tasking, multi-level scheduling, localization and security issues Includes applications of heterogeneous networks in diverse fields and focuses on the convergence of heterogeneous wireless networks for 5G

Download or read book Artificial Intelligence and Industrial Applications written by Tawfik Masrour and published by Springer Nature. This book was released on 2020-07-18 with total page 341 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book gathers selected papers from Artificial Intelligence and Industrial Applications (A2IA’2020), the first installment of an annual international conference organized by ENSAM-Meknes at Moulay Ismail University, Morocco. The 29 papers presented here were carefully reviewed and selected from 141 submissions by an international scientific committee. They address various aspects of artificial intelligence such as digital twin, multiagent systems, deep learning, image processing and analysis, control, prediction, modeling, optimization and design, as well as AI applications in industry, health, energy, agriculture, and education. The book is intended for AI experts, offering them a valuable overview and global outlook for the future, and highlights a wealth of innovative ideas and recent, important advances in AI applications, both of a foundational and practical nature. It will also appeal to non-experts who are curious about this timely and important subject.