Dissertations / Theses on the topic 'Heterogenous Networks'
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Johansson, Klas. "Cost Effective Deployment Strategies for Heterogenous Wireless Networks." Doctoral thesis, KTH, Kommunikationssystem, CoS, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4563.
Full textQC 20100730
Nguyen, Viên. "The Trouble with Diversity: Fork-Join Networks with Heterogenous Customer Population." Massachusetts Institute of Technology, Operations Research Center, 1992. http://hdl.handle.net/1721.1/5406.
Full textAl-Yasir, Yasir, Ahmed M. Abdulkhaleq, Naser O. Parchin, Issa T. Elfergani, J. Rodriguez, James M. Noras, Raed A. Abd-Alhameed, A. Rayit, and Rami Qahwaji. "Green and Highly Efficient MIMO Transceiver System for 5G Heterogenous Networks." IEEE, 2021. http://hdl.handle.net/10454/18574.
Full textThe paper presents the general requirements and an exemplary design of the RF front-end system that in today´s handset is a key consumer of power. The design is required to minimize the carbon footprint in mobile handsets devices, whilst facilitating cooperation, and providing the energy-efficient operation of multi-standards for 5G communications. It provides the basis of hardware solutions for RF front-end integration challenges and offers design features covering energy efficiency for power amplifiers (PAs), Internet of Things (IoT) controlled tunable filters and compact highly isolated multiple-input and multiple-output (MIMO) antennas. An optimum design requires synergetic collaboration between academic institutions and industry in order to satisfy the key requirements of sub-6 GHz energy-efficient 5G transceivers, incorporating energy efficiency, good linearity and the potential for low-cost manufacturing. A highly integrated RF transceiver was designed and implemented to transmit and receive a picture using compact MIMO antennas integrated with efficient tunable filters and high linearity PAs. The proposed system has achieved a bit error rate (BER) of less than 10-10 at a data rate of 600 Mb/s with a wireless communication distance of more than 1 meter and power dissipation of 18-20 mW using hybrid beamforming technology and 64-QAM modulation.
10.13039/100010665-H2020 Marie Skodowska Curie
Al-Yasir, Yasir I. A., Ahmed M. Abdulkhaleq, Naser O. Parchin, I. T. Elfergani, J. Rodriguez, James M. Noras, Raed A. Abd-Alhameed, A. Rayit, and Rami Qahwaji. "Green and Highly Efficient MIMO Transceiver System for 5G Heterogenous Networks." IEEE, 2007. http://hdl.handle.net/10454/18574.
Full textThe paper presents the general requirements and an exemplary design of the RF front-end system that in today´s handset is a key consumer of power. The design is required to minimize the carbon footprint in mobile handsets devices, whilst facilitating cooperation, and providing the energy-efficient operation of multi-standards for 5G communications. It provides the basis of hardware solutions for RF front-end integration challenges and offers design features covering energy efficiency for power amplifiers (PAs), Internet of Things (IoT) controlled tunable filters and compact highly isolated multiple-input and multiple-output (MIMO) antennas. An optimum design requires synergetic collaboration between academic institutions and industry in order to satisfy the key requirements of sub-6 GHz energy-efficient 5G transceivers, incorporating energy efficiency, good linearity and the potential for low-cost manufacturing. A highly integrated RF transceiver was designed and implemented to transmit and receive a picture using compact MIMO antennas integrated with efficient tunable filters and high linearity PAs. The proposed system has achieved a bit error rate (BER) of less than 10-10 at a data rate of 600 Mb/s with a wireless communication distance of more than 1 meter and power dissipation of 18-20 mW using hybrid beamforming technology and 64-QAM modulation.
10.13039/100010665-H2020 Marie Skodowska Curie
Al-Yasir, Yasir, Ahmed M. Abdulkhaleq, Naser O. Parchin, I. T. Elfergani, J. Rodriguez, James M. Noras, Raed A. Abd-Alhameed, A. Rayit, and Rami Qahwaji. "Green and Highly Efficient MIMO Transceiver System for 5G Heterogenous Networks." IEEE, 2021. http://hdl.handle.net/10454/18574.
Full textThe paper presents the general requirements and an exemplary design of the RF front-end system that in today´s handset is a key consumer of power. The design is required to minimize the carbon footprint in mobile handsets devices, whilst facilitating cooperation, and providing the energy-efficient operation of multi-standards for 5G communications. It provides the basis of hardware solutions for RF front-end integration challenges and offers design features covering energy efficiency for power amplifiers (PAs), Internet of Things (IoT) controlled tunable filters and compact highly isolated multiple-input and multiple-output (MIMO) antennas. An optimum design requires synergetic collaboration between academic institutions and industry in order to satisfy the key requirements of sub-6 GHz energy-efficient 5G transceivers, incorporating energy efficiency, good linearity and the potential for low-cost manufacturing. A highly integrated RF transceiver was designed and implemented to transmit and receive a picture using compact MIMO antennas integrated with efficient tunable filters and high linearity PAs. The proposed system has achieved a bit error rate (BER) of less than 10-10 at a data rate of 600 Mb/s with a wireless communication distance of more than 1 meter and power dissipation of 18-20 mW using hybrid beamforming technology and 64-QAM modulation.
10.13039/100010665-H2020 Marie Skodowska Curie
Detamore, Mathias J. "Paradox and the city a margin for the heterogenous connection of urban networks /." Cincinnati, Ohio : University of Cincinnati, 2005. http://www.ohiolink.edu/etd/view.cgi?acc%5Fnum=ucin1116214501.
Full textTitle from electronic thesis title page (viewed Jul. 10, 2006). Includes abstract. Keywords: Left-over urban space; paradox; margin; Thirdspace; Connection; Mobility; Heterogeneous; Space; Network. Includes bibliographical references.
Chan, Siu-Yuen. "Efficent user level infrastructure support for adaptive parallel computing on heterogenous networks of workstations." Thesis, Queensland University of Technology, 2000.
Find full textSun, Chang. "Scalability Analysis of Synchronous Data-Parallel Artificial Neural Network (ANN) Learners." Thesis, Virginia Tech, 2018. http://hdl.handle.net/10919/85020.
Full textMaster of Science
Xu, Yiran. "Quality of Experience Aware Spectrum Efficiency and Energy Efficiency Over Wireless Heterogeneous Networks." DigitalCommons@USU, 2016. https://digitalcommons.usu.edu/etd/4664.
Full textAlkhawlani, Mohammed Mohssen. "Access network selection in heterogeneous networks." Thesis, De Montfort University, 2008. http://hdl.handle.net/2086/5217.
Full textHildebrand, Matthias. "Optimized network access in heterogeneous wireless networks." Kassel : Kassel Univ. Press, 2005. http://deposit.d-nb.de/cgi-bin/dokserv?idn=977677540.
Full textTaiwo, Olugbenga Adekunle. "Network access selection in heterogeneous wireless networks." Master's thesis, University of Cape Town, 2013. http://hdl.handle.net/11427/16832.
Full textCheng, Jerry. "Collaborative network security for heterogeneous mobile networks." Diss., Restricted to subscribing institutions, 2007. http://proquest.umi.com/pqdweb?did=1472132471&sid=1&Fmt=2&clientId=1564&RQT=309&VName=PQD.
Full textHildebrand, Matthias [Verfasser]. "Optimized network access in heterogeneous wireless networks / Matthias Hildebrand." Kassel : Kassel Univ. Press, 2005. http://d-nb.info/977677540/34.
Full textBehjati, Mohammadreza. "Self-organising network management for heterogeneous LTE-advanced networks." Thesis, Brunel University, 2015. http://bura.brunel.ac.uk/handle/2438/10972.
Full textLi, Yue. "Edge computing-based access network selection for heterogeneous wireless networks." Thesis, Rennes 1, 2017. http://www.theses.fr/2017REN1S042/document.
Full textTelecommunication network has evolved from 1G to 4G in the past decades. One of the typical characteristics of the 4G network is the coexistence of heterogeneous radio access technologies, which offers end-users the capability to connect them and to switch between them with their mobile devices of the new generation. However, selecting the right network is not an easy task for mobile users since access network condition changes rapidly. Moreover, video streaming is becoming the major data service over the mobile network where content providers and network operators should cooperate to guarantee the quality of video delivery. In order to cope with this context, the thesis concerns the design of a novel approach for making an optimal network selection decision and architecture for improving the performance of adaptive streaming in the context of a heterogeneous network. Firstly, we introduce an analytical model (i.e. linear discrete-time system) to describe the network selection procedure considering one traffic class. Then, we consider the design of a selection strategy based on foundations from linear optimal control theory, with the objective to maximize network resource utilization while meeting the constraints of the supported services. Computer simulations with MATLAB are carried out to validate the efficiency of the proposed mechanism. Based on the same principal we extend this model with a general analytical model describing the network selection procedures in heterogeneous network environments with multiple traffic classes. The proposed model was, then, used to derive a scalable mechanism based on control theory, which allows not only to assist in steering dynamically the traffic to the most appropriate network access but also helps in blocking the residual traffic dynamically when the network is congested by adjusting dynamically the access probabilities. We discuss the advantages of a seamless integration with the ANDSF. A prototype is also implemented into ns-3. Simulation results sort out that the proposed scheme prevents the network congestion and demonstrates the effectiveness of the controller design, which can maximize the network resources allocation by converging the network workload to the targeted network occupancy. Thereafter, we focus on enhancing the performance of DASH in a mobile network environment for the users which has one access network. We introduce a novel architecture based on MEC. The proposed adaptation mechanism, running as an MEC service, can modify the manifest files in real time, responding to network congestion and dynamic demand, thus driving clients towards selecting more appropriate quality/bitrate video representations. We have developed a virtualized testbed to run the experiment with our proposed scheme. The simulation results demonstrate its QoE benefits compared to traditional, purely client-driven, bitrate adaptation approaches since our scheme notably improves both on the achieved MOS and on fairness in the face of congestion. Finally, we extend the proposed the MEC-based architecture to support the DASH service in a multi-access heterogeneous network in order to maximize the QoE and fairness of mobile users. In this scenario, our scheme should help users select both video quality and access network and we formulate it as an optimization problem. This optimization problem can be solved by IBM CPLEX tool. However, this tool is time-consuming and not scalable. Therefore, we introduce a heuristic algorithm to make a sub-optimal solution with less complexity. Then we implement a testbed to conduct the experiment and the result demonstrates that our proposed algorithm notably can achieve similar performance on overall achieved QoE and fairness with much more time-saving compared to the IBM CPLEX tool
Kozat, Ulaș C. "Heterogeneous wireless networks : an analysis of network and service level diversity /." College Park, Md. : University of Maryland, 2004. http://hdl.handle.net/1903/1404.
Full textThesis research directed by: Electrical Engineering. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
Wang, Xiaoyuan. "Network Selection and Rate Allocation in Heterogeneous Wireless Networks and Systems." University of Cincinnati / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1258729392.
Full textChung, Haera. "Optimal Network Topologies and Resource Mappings for Heterogeneous Networks-on-Chip." PDXScholar, 2013. https://pdxscholar.library.pdx.edu/open_access_etds/997.
Full textGambetti, Claudio <1978>. "Wireless heterogeneous networks." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2007. http://amsdottorato.unibo.it/394/.
Full textMuhammad, Sanusi. "Scalable and network aware video coding for advanced communications over heterogeneous networks." Thesis, Brunel University, 2013. http://bura.brunel.ac.uk/handle/2438/7469.
Full textTing, Kee Ngoh Alvin. "Network selection and optimisation of 4G heterogeneous multi-hop broadband wireless networks." Thesis, University of Strathclyde, 2014. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=24740.
Full textAndersson, Karl. "On access network selection models and mobility support in heterogeneous wireless networks." Doctoral thesis, Luleå tekniska universitet, Datavetenskap, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-18402.
Full textGodkänd; 2010; 20100811 (karand); DISPUTATION Ämnesområde: Mobila system/Mobile Systems Opponent: Universitetslektor, docent Marcus Fiedler, Blekinge tekniska högskola Ordförande: Universitetslektor, docent Christer Åhlund, Luleå tekniska universitet Tid: Fredag den 12 november 2010, kl 11.00 Plats: A1514 Demostudion, Luleå tekniska universitet
Magagula, Linoh A. "A network-based coordination design for seamless handover between heterogeneous wireless networks." Doctoral thesis, University of Cape Town, 2010. http://hdl.handle.net/11427/10801.
Full textThe rapid growth of mobile and wireless communication over the last few years has spawned many different wireless networks. These heterogeneous wireless networks are envisioned to interwork over an IP-based infrastructure to realize ubiquitous network service provisioning for mobile users. Moreover, the availability of multiple-interface mobile nodes (MNs) will make it possible to communicate through any of these wireless access networks. This wireless network heterogeneity combined with the availability of multiple-interface MNs creates an environment where handovers between the different wireless access technologies become topical during mobility events. Therefore, operators with multiple interworking heterogeneous wireless networks will need to facilitate seamless vertical handovers among their multiple systems. Seamless vertical handovers ensure ubiquitous continuity to active connections hence satisfy the quality of experience of the mobile users.
Zhang, Jianjun. "Efficient Information Dissemination in Wide Area Heterogeneous Overlay Networks." Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/16129.
Full textMugume, Edwin. "Green heterogeneous cellular networks." Thesis, University of Manchester, 2016. https://www.research.manchester.ac.uk/portal/en/theses/green-heterogeneous-cellular-networks(e7976a91-c891-4174-abaf-18820ff1736d).html.
Full textSibanda, Clifford Clifton Leonard. "Media independent handovers : network selection for mobile IP nodes in heterogeneous wireless networks." Master's thesis, University of Cape Town, 2008. http://hdl.handle.net/11427/5104.
Full textIncludes bibliographical references (p. 79-82).
In Next Generation Networks (NGN), also known as 4G, Beyond 3G, Converged, Integrated and Interworked Network, user node mobility in wireless and wired environments will seamlessly cross disparate network boundaries. The effort to offer ubiquitous computing, providing access to services anywhere and anytime, strongly encourages the ability to roam across the different existing and future networks. Literature shows investigation of concepts such as Always Best Connected (ABC) when heterogeneous networks co-exist , which will work or compete with other schemes like Home Network Default (HND), Compatibility and Network Operator Agreements (CNOA) to guide network selection or access . With the variety of available networks, the mobile node may be faced with having to decide which network to connect to. We concentrate on the network selection aspects of these envisaged mobile, overlay and integrated environment in heterogeneous networks. The standard developments by the IEEE802.21 Working group and the IETF Networking group form the base of our approach that seeks to see mobility across heterogeneous networks a reality. We propose an IEEE802.21 Media Independent Handover Function (MIHF) based network discovery and network selection, leading to a handover. The selection may be further assisted by an MIHF capable Broker Node that is Third party to the Network Providers to provide a central yet distributed database of the available networks as encountered by the Mobile Node, to cater for Nodes with no prior knowledge of networks and software repository. A Mobile Node (MN) in our solution uses 802.21 communication messages to obtain information about foreign networks encountered before selecting the networks to connect to. Our evaluation through simulations, shows that network selection in heterogeneous wireless networks environment for the appropriately equipped devices is greatly enhanced by the use of the Media Independent Handover Protocol. In scenarios where the mobile node has no prior knowledge of the encountered different network architectures, the use of a Broker node can, for an optimal number of available networks also greatly enhance the mobile node’s network selection by reducing the delay associated and the packet losses incurred.
Khan, Shoaib. "Towards a reliable seamless mobility support in heterogeneous IP networks." Thesis, Brunel University, 2009. http://bura.brunel.ac.uk/handle/2438/4065.
Full textAl, Ridhawi Ismaeel. "Simulation-Assisted QoS-Aware VHO in Wireless Heterogeneous Networks." Thèse, Université d'Ottawa / University of Ottawa, 2014. http://hdl.handle.net/10393/30377.
Full textYao, Yong. "A Software Framework for Prioritized Spectrum Access in Heterogeneous Cognitive Radio Networks." Doctoral thesis, Blekinge Tekniska Högskola [bth.se], Faculty of Computing - Department of Communication Systems, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-00590.
Full textZheng, Zici. "Adaptive explicit congestion notification (AECN) for heterogeneous flows." Link to electronic thesis, 2001. http://www.wpi.edu/Pubs/ETD/Available/etd-0502101-062544.
Full textAbou-Zeid, Al-Hussein A. "Stochastic models of congestion control in heterogeneous next generation packet networks /." Thesis, Connect to this title online; UW restricted, 2001. http://hdl.handle.net/1773/5994.
Full textBaranda, Hortigüela Jorge. "End-to-end network service orchestration in heterogeneous domains for next-generation mobile networks." Doctoral thesis, Universitat Politècnica de Catalunya, 2021. http://hdl.handle.net/10803/672782.
Full text5G marca el inicio de una gran revolución en las redes móviles, convirtiéndose en redes orientadas a servicios para satisfacer las demandas de nuevos actores, las industrias verticales. Esta revolución supone un rediseño total de la arquitectura de red donde la complejidad, heterogeneidad, dinamicidad y flexibilidad serán la norma. En este contexto, la automatización y programabilidad serán esenciales para superar los rígidos procesos actuales de operación de red. Las redes definidas por software (SDN), la virtualización de funciones de red (NFV) y el particionamiento de redes son técnicas clave para proporcionar dichas capacidades. Éstas son complementarias, pero aún recientes y sus sinergias se deben explotar para realizar la nueva visión. El objetivo de esta tesis es contribuir a su desarrollo e integración en la nuevas generaciones de redes móviles mediante el diseño de una arquitectura de orquestación de servicios de red (NSO) extremo a extremo (E2E), que alineada con algunas pautas y especificaciones de los principales organismos de estandarización, va más allá de los actuales sistemas de gestión y orquestación (MANO) para instanciar y garantizar los requisitos de los diversos servicios de red desplegados concurrentemente en infraestructuras heterogéneas compartidas que combinan múltiples tecnologías y dominios administrativos (AD). Siguiendo un enfoque ascendente, comenzamos a estudiar aspectos de SDN relacionados con la gestión de elementos de red inalámbricos y su integración en arquitecturas jerárquicas de orquestación de recursos de red en infraestructuras multi tecnología (inalámbrica, óptica, paquetes). Luego, este trabajo se integra en un módulo de administración de infraestructura que ejecuta de forma conjunta la abstracción y la asignación de recursos de red y computación en múltiples puntos de presencia (PoP) distribuidos conectados por una red de transporte, aspecto que no está (o ligeramente) considerado por los actuales sistemas MANO. Este módulo ejecuta la integración de las técnicas NFV y SDN. Esta integración está dirigida por el módulo Orquestador de Servicios, que automatiza la gestión E2E del ciclo de vida de los servicios de red implementando las diferentes particiones de red en base a los requisitos de los verticales, los recursos de infraestructura disponibles y mientras cumple los acuerdos de nivel de servicio (SLA) durante la operación del servicio. Esta arquitectura, centrada en escenarios con un único AD, forma el primer grupo de contribuciones de esta tesis. El segundo grupo de contribuciones evoluciona esta arquitectura abordando la orquestación y compartición de particiones de red y sus componentes (NSSIs) en escenarios con múltiples AD. La consideración detallada de aspectos de orquestación de recursos es el principal aspecto diferencial con la literatura. Esto es fundamental para la interconexión de NSSIs, haciendo realidad la orquestación E2E y el particionamiento de red en escenarios con múltiples AD. Además, se considera la gestión de SLA mediante acciones de escalado durante la operación del servicio en los escenarios mencionados. El tercer grupo de contribuciones valida las arquitecturas, procedimientos e interfaces resultantes pues se han implementado y evaluado sobre infraestructuras experimentales reales que presentan múltiples AD y tecnologías de transporte interconectando PoP distribuidos. Esta experimentación considera definiciones de servicios de red cercanos a casos de uso de verticales reales, como automoción y eHealth, ayudando a cubrir la brecha entre los proveedores de red y los verticales. Los resultados experimentales muestran que la creación y el escalado de servicios de red se pueden realizar en pocos minutos en escenarios con un único o múltiples ADs, en línea con los indicadores de red objetivos de 5G. Estas medidas, escasas en la literatura actual, sirven como referencia para caracterizar las diferentes operaciones involucradas durante el despliegue de servicios.
Arquitectura de computadors
Shen, Wei. "Network Selection Strategies and Resource Management Schemes in Integrated Heterogeneous Wireless and Mobile Networks." University of Cincinnati / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1250182019.
Full textCAVALCANTI, DAVE ALBERTO TAVARES. "INTEGRATED ARCHITECTURE AND ROUTING PROTOCOLS FOR HETEROGENEOUS WIRELESS NETWORKS." University of Cincinnati / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1140716621.
Full textGrimm, Allen Gary. "An Exploration Of Heterogeneous Networks On Chip." PDXScholar, 2011. https://pdxscholar.library.pdx.edu/open_access_etds/185.
Full textBenigni, Matthew Curran. "Detection and Analysis of Online Extremist Communities." Research Showcase @ CMU, 2017. http://repository.cmu.edu/dissertations/949.
Full textLiu, Xiaoshan. "Mobility and radio resource management in heterogeneous wireless networks." Click to view the E-thesis via HKUTO, 2006. http://sunzi.lib.hku.hk/hkuto/record/B38233873.
Full textPimentel, Niño Maria Alejandra. "Video adaptation over heterogeneous networks." Doctoral thesis, Universitat Autònoma de Barcelona, 2014. http://hdl.handle.net/10803/283931.
Full textVideo services have become part of everyday interactions and contribute to a major portion of network traffic. Their broader usage includes out-of-the-ordinary scenarios as aid in emergencies, or telemedicine. Moreover, user demands of such services in terms of overall user experience continue to increase, leading to more specialized Quality of Experience (QoE) requirements. Guaranteeing a level of satisfaction to the user in challenging scenarios where the alternative networks are heterogeneous in nature continues to be an open issue. The main objectives of this thesis have been to: 1) propose a framework for heterogeneous networking that allows for a seamless delivery of video content along diverse heterogeneous networks, 2) propose a user-centric framework for video transmission in line with heterogeneous networking, and 3) design a complete model and solution to provide video adaptation in heterogeneous networks such that it meets the requirements for user satisfaction. The contributions of this thesis, such that the three objectives are met are as follows. First, we propose to model heterogeneous networks with a holistic approach. The methodology of this holistic system design is based on two novel concepts. On one hand, to provide a framework by which heterogeneous network instances can be modeled to guarantee generality and robustness. On the other hand, to uniquely characterize the network instances via their min-cut. The strength of this framework is its usage as an underlying system model that can guarantee seamless content delivery regardless of the network instance. The latter is possible by formulating a general cross-layer optimization for content delivery, coherent to information-centric networking philosophy. Second, we propose a QoE-driven adaptive video framework, based on a cross-layer optimization formulation. The derived adaptive video algorithm for time-variant networks is delay-driven, hence contemplates the constraints of long-delayed networks and the challenges of establishing a feedback loop to enable the network adaptability. The framework is evaluated systematically, in both an emulation and a fully implemented experimental environment. Third, we propose the main contribution of this thesis: a complete model to provide user-centric video services in heterogeneous networks. The problem of combined erasures and congestion in best effort network is decoupled to match the specific degrading effects on the video. This allows for two separate QoE driven optimization approaches in time (freezes) and space (artifacts) domain. The complete solution offers a feasible dynamic streaming adaptation that suits constraint heterogeneous networks such as satellite. The performance is evaluated through a novel QoE three-dimensional analysis. The overall solution contemplates a novel semantical dimension, in line with information-centric networking, with an unexplored take on semantics that intends to reflect on the perceptual needs of the end user. We prove the strength of our design for the situation awareness scenario, where heterogeneous networks are often used, and show substantial gain in terms of mitigation of the effects of congestion and erasures while improving QoE and achieving the expected user's perceptual demands.
Sandberg, Henrik, Maben Rabi, Mikael Skoglund, and Karl Henrik Johansson. "Estimation over heterogeneous sensor networks." KTH, ACCESS Linnaeus Centre, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-30325.
Full textQC 20110224
Joyce, Robert Michael. "Self-organising heterogeneous cellular networks." Thesis, University of Leeds, 2013. http://etheses.whiterose.ac.uk/6521/.
Full textDandachi, Ghina. "Multihoming in heterogeneous wireless networks." Thesis, Evry, Institut national des télécommunications, 2017. http://www.theses.fr/2017TELE0014/document.
Full textFifth generation mobile networks (5G) are being designed to introduce new services that require extreme broadband data rates and utlra-reliable latency. 5G will be a paradigm shift that includes heterogeneous networks with densification, virtualized radio access networks, mm-wave carrier frequencies, and very high device densities. However, unlike the previous generations, it will be a holistic network, tying any new 5G air interface and spectrum with the currently existing LTE and WiFi. In this context, we focus on new resource allocation strategies that are able to take advantage of multihoming in dual access settings. We model such algorithms at the flow level and analyze their performance in terms of flow throughput, system stability and fairness between different classes of users. We first focus on multihoming in LTE/WiFi heterogeneous networks. We consider network centric allocations where a central scheduler performs local and global proportional fairness (PF) allocations for different classes of users, single-homed and multihomed users. By comparison with a reference model without multihoming, we show that both strategies improve system performance and stability, at the expense of more complexity for the global PF. We also investigate user centric allocation strategies where multihomed users decide the split of a file using either peak rate maximization or network assisted strategy. We show that the latter strategy maximizes the average throughput in the whole network. We also show that network centric strategies achieve higher data rates than the user centric ones. Then, we focus on Virtual Radio Access Networks (V-RAN) and particularly on multi-resource allocation therein. We investigate the feasibility of virtualization without decreasing neither users performance, nor system's stability. We consider a 5G heterogeneous network composed of LTE and mm-wave cells in order to study how high frequency networks can increase system's capacity. We show that network virtualization is feasible without performance loss when using the dominant resource fairness strategy (DRF). We propose a two-phase allocation (TPA) strategy which achieves a higher fairness index than DRF and a higher system stability than PF. We also show significant gains brought by mm-wave instead of WiFi. Eventually, we consider energy efficiency and compare DRF and TPA strategies with a Dinklebach based energy efficient strategy. Our results show that the energy efficient strategy slightly outperforms DRF and TPA at low to medium load in terms of higher average throughput with comparable power consumption, while it outperforms them at high load in terms of power consumption. In this case of high load, DRF outperforms TPA and the energy efficient strategy in terms of average throughput. As for Jain's fairness index, TPA achieves the highest one
Liu, Xiaoshan, and 劉曉杉. "Mobility and radio resource management in heterogeneous wireless networks." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2006. http://hub.hku.hk/bib/B38233873.
Full textSundaresan, Karthikeyan. "Network Protocols for Ad-Hoc Networks with Smart Antennas." Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/14122.
Full textCoutinho, Nuno Alexandre Tavares. "Seamless integration of heterogeneous networks in multicast environments." Doctoral thesis, Universidade de Aveiro, 2014. http://hdl.handle.net/10773/14193.
Full textNowadays, communication environments are already characterized by a myriad of competing and complementary technologies that aim to provide an ubiquitous connectivity service. Next Generation Networks need to hide this heterogeneity by providing a new abstraction level, while simultaneously be aware of the underlying technologies to deliver richer service experiences to the end-user. Moreover, the increasing interest for group-based multimedia services followed by their ever growing resource demands and network dynamics, has been boosting the research towards more scalable and exible network control approaches. The work developed in this Thesis enables such abstraction and exploits the prevailing heterogeneity in favor of a context-aware network management and adaptation. In this scope, we introduce a novel hierarchical control framework with self-management capabilities that enables the concept of Abstract Multiparty Trees (AMTs) to ease the control of multiparty content distribution throughout heterogeneous networks. A thorough evaluation of the proposed multiparty transport control framework was performed in the scope of this Thesis, assessing its bene ts in terms of network selection, delivery tree recon guration and resource savings. Moreover, we developed an analytical study to highlight the scalability of the AMT concept as well as its exibility in large scale networks and group sizes. To prove the feasibility and easy deployment characteristic of the proposed control framework, we implemented a proof-of-concept demonstrator that comprehends the main control procedures conceptually introduced. Its outcomes highlight a good performance of the multiparty content distribution tree control, including its local and global recon guration. In order to endow the AMT concept with the ability to guarantee the best service experience by the end-user, we integrate in the control framework two additional QoE enhancement approaches. The rst employs the concept of Network Coding to improve the robustness of the multiparty content delivery, aiming at mitigating the impact of possible packet losses in the end-user service perception. The second approach relies on a machine learning scheme to autonomously determine at each node the expected QoE towards a certain destination. This knowledge is then used by di erent QoE-aware network management schemes that, jointly, maximize the overall users' QoE. The performance and scalability of the control procedures developed, aided by the context and QoE-aware mechanisms, show the advantages of the AMT concept and the proposed hierarchical control strategy for the multiparty content distribution with enhanced service experience. Moreover we also prove the feasibility of the solution in a practical environment, and provide future research directions that bene t the evolved control framework and make it commercially feasible.
Atualmente, os ambientes de comunicação caracterizam-se pela diversidade de tecnologias concorrentes e complementares cujo principal objetivo é fornecer conectividade de forma ubíqua. De forma a lidar com esta heterogeneidade, as redes de próxima geração terão de suportar um novo nível de abstração, embora simultaneamente necessitem de estar conscientes das tecnologias presentes de forma a oferecer uma melhor experiência do serviço ao utilizador final. Para além disso, o crescente interesse por comunicações multimédia para grupos de utilizadores e as cada vez maiores exigências em termos de recursos e dinâmica da rede destes serviços, tem motivado a investigação no sentido de desenvolver soluções de controlo da rede mais escaláveis e flexíveis. O trabalho desenvolvido nesta Tese, não só aborda o suporte da camada de abstração, como também explora a heterogeneidade presente em prol de uma gestão e adaptação da rede consciente do seu contexto. Neste âmbito, é introduzida nesta Tese uma nova estrutura hierárquica de controlo com capacidades de auto-gestão que possibilitam o conceito de Abstract Multiparty Trees (AMTs) de forma a facilitar o controlo da distribuição de conteúdos para grupos através de redes heterogéneas. Nesta Tese foi também realizada uma avaliação detalhada da estrutura de controlo de forma a aferir os benefícios do controlo da rede baseado na informação de contexto, no que diz respeito à seleção da rede, reconfiguração da árvore de distribuição, poupança de recursos e operações de gestão. Para além disso, foi também desenvolvido um estudo analítico para destacar a escalabilidade do conceito AMT, bem como da sua flexibilidade perante redes de grande escala e um vasto número de potenciais utilizadores. De forma a provar a viabilidade e fácil aplicação da estrutura de controlo proposta, foi implementado um demonstrador para prova de conceito que inclui os principais procedimentos de controlo introduzidos conceptualmente. Os resultados da avaliação do demonstrador salientam o bom desempenho no controlo da árvore de distribuição de conteúdos, bem como nos processos de reconfiguração local e global da mesma. Com o intuito de dotar o conceito AMT com a capacidade de garantir a melhor experiência de serviço pelo utilizador final, integrou-se na estrutura de controlo proposta dois mecanismos para melhorar a Qualidade de Experiência (QoE). O primeiro baseia-se na utilização do conceito de Codificação de Rede para melhorar a robustez da entrega de conteúdos a grupos, tendo como objetivo eliminar o impacto da possível perda de pacotes na perceção do serviço por parte do utilizador. O segundo mecanismo tira partido do conceito de aprendizagem automática para que, de forma autónoma, seja capaz de determinar em cada nó da rede o valor expectável de QoE para um dado destino. Este conhecimento é depois utilizado por diferentes mecanismos de gestão de rede sensíveis a QoE para de forma conjunta maximizar a percepção do serviço por parte dos utilizadores finais. O desempenho e a escalabilidade dos processos de controlo desenvolvidos, com a ajuda dos mecanismos sensíveis ao contexto e à QoE, demonstram as vantagens do conceito AMT e da estrutura de controlo hierárquica para a distribuição de conteúdos a grupos com uma experiência de serviço melhorada. Para além disso, é também demonstrada a praticabilidade da nossa solução, bem como possíveis linhas de investigação que podem melhorar a estrutura de controlo proposta e fazer dela comercialmente aplicável.
Basarudin, Hafiz. "Development of a heterogeneous microwave network, fade simulation tool applicable to networks that span Europe." Thesis, University of Hull, 2012. http://hydra.hull.ac.uk/resources/hull:5774.
Full textRehman, Faisal. "Heterogeneous Embedded Network Architecture." Thesis, Halmstad University, School of Information Science, Computer and Electrical Engineering (IDE), 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-2529.
Full textIn this thesis we focused on high performance embedded real-time networks which are designed for systems like radar signalling processing systems, control systems etc. These high performance embedded networks consist of emerging standards like PCI Express, RapidIO, and standard Ethernet. All of these switched embedded networks communicate with each other through common gateway nodes. As these networks have different rate characteristics, maximum packet size (MTU), packet priorities, addressing schemes etc we have therefore defined the gateway nodes for these heterogeneous embedded networks which will allow these heterogeneous embedded networks to communicate with each other with the help of different translation functions. These gateway nodes allow end-to-end transmission across the heterogeneous embedded networks while keeping bound on end-to-end delay and guaranteed throughput. We need to have some flow control mechanism which will shape the traffic flow in the mentioned embedded networks and will avoid from buffer overflow.
Sharma, Sachin. "Integrated Backhaul Management for Ultra-Dense Network Deployment." Thesis, KTH, Kommunikationssystem, CoS, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-159447.
Full textMartorello, Cristiane Dias de Souza. "Epidemiology in complex networks - modified heterogeneous mean-field model." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/100/100132/tde-16012019-173906/.
Full textO estudo de redes complexas tem se desenvolvido muito nos últimos anos. Nesta dissertação queremos analisar o processo de propagação de epidemia em redes livres de escala através do modelo Suscetível - Infectado - Suscetível (SIS). Apresentamos uma revisão de redes e as principais características dos modelos epidemiológicos clássicos. Implementamos um algoritmo que produz uma rede livre de escala dado um expoente e exploramos a dinâmica do modelo Quenched Mean-Field (QMF) inserido em uma rede livre de escala. Além disso, foi simulada uma possível alteração na topologia da rede, devido aos estados dos vértices infectados, que gerou um limiar epidêmico positivo no modelo e a probabilidade de vértices infectados seguiu uma lei de potência na vizinhança desse ponto crítico
Hsieh, Hung-Yun. "Addressing Network Heterogeneity and Bandwidth Scarcity in Future Wireless Data Networks." Diss., Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/5063.
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