Download or read book Performance Evaluation of Signal Strength and Residual Time Based Vertical Handover in Heterogeneous Wireless Networks International Journal of Computing and Network Technology 2014 Vol 2 No 1 written by Sudesh Pahal and published by . This book was released on 2014 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt:

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 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 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 Optimization of Vertical Handover Decision Processes for Fourth Generation Heterogeneous Wireless Networks written by Xiaohuan Yan and published by . This book was released on 2010 with total page 165 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis presents a vertical handover decision (VHD) scheme for optimizing the efficiency of vertical handover processes in the Fourth Generation (4G) heterogeneous wireless networks. The scheme consists of three closely integrated modules: Handover necessity estimation, handover target selection, and handover triggering condition estimation. Handover necessity estimation module determines whether a handover is necessary to an available network. Handover target selection module chooses the ``best'' network among th eavailable candidates based on a set of criteria. Finally,handover triggering condition estimation module determines the right moment to initiate a handover out of the currently connected network.4G wireless networks are expected to support mechanisms for tight integration and cooperation of divergent access network technologies. In such networks of heterogeneous nature, roaming users will experience frequent handovers across network boundaries. Thus, to ensure seamless roaming and efficient resource usage over dissimilar networks, intelligent VHD algorithms need to be used extensively. The research project presented in this thesis report focuses on this problem and provides an optimized VHD scheme, which minimizes the handover failures, unnecessary handovers and connection breakdowns whilst maintaining users' satisfaction at high levels. In addition,the scheme also provides mechanisms for mobile applications to control the tradeoff between the usage of the preferred access network and number of handovers or connection breakdowns.Simulation based performance evaluations demonstrate that the scheme reduces the number of handover failures, unnecessary handovers and connection breakdowns by up to 80%, 70% and 70%, respectively. They also show an increase of up to 50% in the satisfaction level of users.

Download or read book Context Aware Vertical Handover in Heterogeneous Wireless Networks written by Tansir Ahmed and published by . This book was released on 2007 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book 5G 2020 and Beyond written by Ramjee Prasad and published by CRC Press. This book was released on 2022-09-01 with total page 125 pages. Available in PDF, EPUB and Kindle. Book excerpt: The future society would be ushered in a new communication era with the emergence of 5G. 5G would be significantly different, especially, in terms of architecture and operation in comparison with the previous communication generations (4G, 3G...). This book discusses the various aspects of the architecture, operation, possible challenges, and mechanisms to overcome them. Further, it supports users? interac- tion through communication devices relying on Human Bond Communication and COmmunication-NAvigation- SENsing- SErvices (CONASENSE).Topics broadly covered in this book are; • Wireless Innovative System for Dynamically Operating Mega Communications (WISDOM)• Millimeter Waves and Spectrum Management• Cyber Security• Device to Device Communication

Download or read book LTE A Cellular Networks written by Abid Yahya and published by Springer. This book was released on 2016-09-02 with total page 131 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this book, three different methods are presented to enhance the capacity and coverage area in LTE-A cellular networks. The scope involves the evaluation of the effect of the RN location in terms of capacity and the determination of the optimum location of the relay that provides maximum achievable data rate for users with limited interference at the cell boundaries. This book presents a new model to enhance both capacity and coverage area in LTE-A cellular network by determining the optimum location for the RN with limited interference. The new model is designed to enhance the capacity of the relay link by employing two antennas in RN. This design enables the relay link to absorb more users at cell edge regions. An algorithm called the Balance Power Algorithm (BPA) is developed to reduce MR power consumption. The book pertains to postgraduate students and researchers in wireless & mobile communications.

Download or read book Cross Layer Approach for Seamless Vertical Handover in Networks written by Jambulingam Vinothkumar and published by LAP Lambert Academic Publishing. This book was released on 2014-02 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt: Future Wireless systems will be characterized by their heterogeneity. Multiple access technologies provide access to internet content.Vertical handoff is an important mechanism for achieving continuous seamless transmissions in these networks. When connections need to migrate between heterogeneous networks seamless vertical handoff is necessary. Hence seamless vertical handoff is the first step. With regard to VHO performance, there is a critical need to develop algorithms for connection management and optimal resource allocation for seamless mobility. The integration of WLAN and Wimax has attracted the most attention. In some situation where many mobile devices try to handoff to the same AP, there will be more power consumption at the mobile devices due to increased congestion delay at the AP. Here we take account of e QoS parameters, bandwidth, jitter packet error rate and end-to-end delay, which are selected from multi-layer contributions. First vertical handoff was based on received signal strength (RSS) of the mobile node. Next vertical handoff is improvised by considering bandwidth as well as RSS.Results were simulated using NS-2 and comparison results are evaluated.

Download or read book An Enhanced Vertical Handover Scheme for Monitoring Applications written by Hatem F. H. Ibrahim and published by . This book was released on 2011 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt: For service providers around the world, the network is the strategic platform for delivering new and advanced services to many end-user devices. Nowadays, the need of using two networks at the same time is increasing sharply especially in security monitoring systems. The switching between networks means handoff from one network to another and this is called vertical handover. Integration of various networks such as GPRS and WLAN into IP-based networks is required in these kinds of services, which further requires a seamless vertical handoff between wireless networks. However, all current vertical handover algorithms are implemented without taking into consideration the effect of any signal interfering that might occur, such as jamming signals that will confuse the handoff decision whether it should be taken or not. An improved GPRS-WLAN vertical handover is proposed in this research work. This algorithm is implemented with taking into consideration that the handover decision occurs depending on the received signal strength indicator (RSSI) as well as the network throughput in order to get high service quality as well as seamless network connection. Due to the tunneling that have been proposed in this algorithm, a significant reduction in the handover delay has been achieved. Finally, as a conclusion, all the objectives of this research work is achieved which proves that when the network handoff depends on the throughput as well as the RSSI, is much better when the handoff depending on the RSSI only as the service connection will be continuous with the same quality or better.

Download or read book Mobile Big Data written by Xiang Cheng and published by Springer. This book was released on 2018-08-23 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a comprehensive picture of mobile big data starting from data sources to mobile data driven applications. Mobile Big Data comprises two main components: an overview of mobile big data, and the case studies based on real-world data recently collected by one of the largest mobile network carriers in China. In the first component, four areas of mobile big data life cycle are surveyed: data source and collection, transmission, computing platform and applications. In the second component, two case studies are provided, based on the signaling data collected in the cellular core network in terms of subscriber privacy evaluation and demand forecasting for network management. These cases respectively give a vivid demonstration of what mobile big data looks like, and how it can be analyzed and mined to generate useful and meaningful information and knowledge. This book targets researchers, practitioners and professors relevant to this field. Advanced-level students studying computer science and electrical engineering will also be interested in this book as supplemental reading.

Download or read book Ultra Dense Networks for 5G and Beyond written by Trung Q. Duong and published by John Wiley & Sons. This book was released on 2019-04-15 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt: Offers comprehensive insight into the theory, models, and techniques of ultra-dense networks and applications in 5G and other emerging wireless networks The need for speed—and power—in wireless communications is growing exponentially. Data rates are projected to increase by a factor of ten every five years—and with the emerging Internet of Things (IoT) predicted to wirelessly connect trillions of devices across the globe, future mobile networks (5G) will grind to a halt unless more capacity is created. This book presents new research related to the theory and practice of all aspects of ultra-dense networks, covering recent advances in ultra-dense networks for 5G networks and beyond, including cognitive radio networks, massive multiple-input multiple-output (MIMO), device-to-device (D2D) communications, millimeter-wave communications, and energy harvesting communications. Clear and concise throughout, Ultra-Dense Networks for 5G and Beyond - Modelling, Analysis, and Applications offers a comprehensive coverage on such topics as network optimization; mobility, handoff control, and interference management; and load balancing schemes and energy saving techniques. It delves into the backhaul traffic aspects in ultra-dense networks and studies transceiver hardware impairments and power consumption models in ultra-dense networks. The book also examines new IoT, smart-grid, and smart-city applications, as well as novel modulation, coding, and waveform designs. One of the first books to focus solely on ultra-dense networks for 5G in a complete presentation Covers advanced architectures, self-organizing protocols, resource allocation, user-base station association, synchronization, and signaling Examines the current state of cell-free massive MIMO, distributed massive MIMO, and heterogeneous small cell architectures Offers network measurements, implementations, and demos Looks at wireless caching techniques, physical layer security, cognitive radio, energy harvesting, and D2D communications in ultra-dense networks Ultra-Dense Networks for 5G and Beyond - Modelling, Analysis, and Applications is an ideal reference for those who want to design high-speed, high-capacity communications in advanced networks, and will appeal to postgraduate students, researchers, and engineers in the field.

Download or read book LTE Security written by Dan Forsberg and published by John Wiley & Sons. This book was released on 2011-06-09 with total page 277 pages. Available in PDF, EPUB and Kindle. Book excerpt: Addressing the security solutions for LTE, a cellular technology from Third Generation Partnership Project (3GPP), this book shows how LTE security substantially extends GSM and 3G security. It also encompasses the architectural aspects, known as SAE, to give a comprehensive resource on the topic. Although the security for SAE/LTE evolved from the security for GSM and 3G, due to different architectural and business requirements of fourth generation systems the SAE/LTE security architecture is substantially different from its predecessors. This book presents in detail the security mechanisms employed to meet these requirements. Whilst the industry standards inform how to implement systems, they do not provide readers with the underlying principles behind security specifications. LTE Security fills this gap by providing first hand information from 3GPP insiders who explain the rationale for design decisions. Key features: Provides a concise guide to the 3GPP/LTE Security Standardization specifications Authors are leading experts who participated in decisively shaping SAE/LTE security in the relevant standardization body, 3GPP Shows how GSM and 3G security was enhanced and extended to meet the requirements of fourth generation systems Gives the rationale behind the standards specifications enabling readers to have a broader understanding of the context of these specifications Explains why LTE security solutions are designed as they are and how theoretical security mechanisms can be put to practical use

Download or read book Vehicular Networking written by Christoph Sommer and published by Cambridge University Press. This book was released on 2015 with total page 373 pages. Available in PDF, EPUB and Kindle. Book excerpt: Learn about the basics and the future of vehicular networking research with this essential guide to in- and inter-vehicle communication.

Download or read book Future Telco written by Peter Krüssel and published by Springer. This book was released on 2018-07-23 with total page 413 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book examines the extensive changes in markets, technologies and value chains that telecommunication companies are currently confronted with. It analyzes the crossroads they have reached and the choices that now need to be made – to be a bit pipe or a trendsetter of digitalization. Based on an analysis of the key challenges for telcos, the book derives future market scenarios and puts forward recommendations for how they can successfully position themselves. It proposes a framework based on seven “levers,” which addresses concrete measures in each step of the value chain, ranging from technology, IT and processes, to innovation, marketing and sales issues. The book discusses the current challenges and provides both general recommendations and concrete solutions. Respected experts illustrate innovative strategic and technical trends and provide insights gained in real-life transformation projects. Recent developments in the areas of regulation, product development, competition between over-the-top (OTT) providers and telcos, as well as technical innovations like 5G, SDN/NFV, LEO satellites and MEC are discussed. Accordingly, practitioners, managers and researchers alike will benefit from the book’s wealth of examples and up-to-date insights.

Download or read book 5G Outlook Innovations and Applications written by Ramjee Prasad and published by CRC Press. This book was released on 2022-09-01 with total page 259 pages. Available in PDF, EPUB and Kindle. Book excerpt: 5G Outlook - Innovations and Applications is a collection of the recent research and development in the area of the Fifth Generation Mobile Technology (5G), the future of wireless communications. Plenty of novel ideas and knowledge of the 5G are presented in this book as well as divers applications from health science to business modeling. The authors of different chapters contributed from various countries and organizations. The chapters have also been presented at the 5th IEEE 5G Summit held in Aalborg on July 1, 2016. The book starts with a comprehensive introduction on 5G and its need and requirement. Then millimeter waves as a promising spectrum to 5G technology is discussed. The book continues with the novel and inspiring ideas for the future wireless communication usage and network. Further, some technical issues in signal processing and network design for 5G are presented. Finally, the book ends up with different applications of 5G in distinct areas. Topics widely covered in this book are: • 5G technology from past to present to the future• Millimeter- waves and their characteristics• Signal processing and network design issues for 5G• Applications, business modeling and several novel ideas for the future of 5G

Download or read book Computer Networks written by Andrew S. Tanenbaum and published by Prentice Hall. This book was released on 2019-02 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: