20 research outputs found

    eMobile internet protocol version six (IPv6) testbed for interoperability of Nigerian education services and networks

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    The diversity of educational methods, services and protocols promoted disparate educational services in Nigeria. The diversity has not promoted resource sharing and has encouraged duplication of efforts. There is no doubt that the University systems in Nigeria need to complement each other bearing in mind the limited resources available to individual University system. With the introduction of next generation internet protocol version six (IPv6), some of the divergent technologies can be brought to a platform to facilitate resource sharing, capacity development and optimization of resources. In order to solve these diversities of resources affecting Nigerian Education Services and Network, Route Optimization Techniques in IPv6 will provide the best option for scaling these diversities. The Nigeria ecosystem has come of age and attained maturity level to identify the futuristic roles of internet protocol version six (IPv6). Globally, Policy makers and Governments have recognized the enormous opportunities the Internet can create and its impact on economic growth and prosperity. The prime mission of the invention is to develop and provide an eMobile IPv6 testbed that supports optimization of resources for digital services in Nigeria Tertiary Education

    Context transfer support for mobility management in all-IP networks.

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    This thesis is a description of the research undertaken in the course of the PhD and evolves around a context transfer protocol which aims to complement and support mobility management in next generation mobile networks. Based on the literature review, it was identified that there is more to mobility management than handover management and the successful change of routing paths. Supportive mechanisms like fast handover, candidate access router discovery and context transfer can significantly contribute towards achieving seamless handover which is especially important in the case of real time services. The work focused on context transfer motivated by the fact that it could offer great benefits to session re-establishment during the handover operation of a mobile user and preliminary testbed observations illustrated the need for achieving this. Context transfer aims to minimize the impact of certain transport, routing, security-related services on the handover performance. When a mobile node (MN) moves to a new subnet it needs to continue such services that have already been established at the previous subnet. Examples of such services include AAA profile, IPsec state, header compression, QoS policy etc. Re-establishing these services at the new subnet will require a considerable amount of time for the protocol exchanges and as a result time- sensitive real-time traffic will suffer during this time. By transferring state to the new domain candidate services will be quickly re-established. This would also contribute to the seamless operation of application streams and could reduce susceptibility to errors. Furthermore, re-initiation to and from the mobile node will be avoided hence wireless bandwidth efficiency will be conserved. In this research an extension to mobility protocols was proposed for supporting state forwarding capabilities. The idea of forwarding states was also explored for remotely reconfiguring middleboxes to avoid any interruption of a mobile users' sessions or services. Finally a context transfer module was proposed to facilitate the integration of such a mechanism in next generation architectures. The proposals were evaluated analytically, via simulations or via testbed implementation depending on the scenario investigated. The results demonstrated that the proposed solutions can minimize the impact of security services like authentication, authorization and firewalls on a mobile user's multimedia sessions and thus improving the overall handover performance

    A critical analysis of mobility management related issues of wireless sensor networks in cyber physical systems

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    Mobility management has been a long-standing issue in mobile wireless sensor networks and especially in the context of cyber physical systems its implications are immense. This paper presents a critical analysis of the current approaches to mobility management by evaluating them against a set of criteria which are essentially inherent characteristics of such systems on which these approaches are expected to provide acceptable performance. We summarize these characteristics by using a quadruple set of metrics. Additionally, using this set we classify the various approaches to mobility management that are discussed in this paper. Finally, the paper concludes by reviewing the main findings and providing suggestions that will be helpful to guide future research efforts in the area. **Please note that there are multiple authors for this article therefore only the name of the first 5 including Federation University Australia affiliate “Muhammad Imran” is provided in this record*

    A critical analysis of mobility management related issues of wireless sensor networks in cyber physical systems

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    Mobility management has been a long-standing issue in mobile wireless sensor networks and especially in the context of cyber physical systems; its implications are immense. This paper presents a critical analysis of the current approaches to mobility management by evaluating them against a set of criteria which are essentially inherent characteristics of such systems on which these approaches are expected to provide acceptable performance. We summarize these characteristics by using a quadruple set of metrics. Additionally, using this set we classify the various approaches to mobility management that are discussed in this paper. Finally, the paper concludes by reviewing the main findings and providing suggestions that will be helpful to guide future research efforts in the area

    Diseño de una solución de movilidad de cliente basada en SDN

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    Due to the complex scene of the growing networks infrastructure in the big cities, and because of the increasing amount of the mobile devices, the management of the users’ flows has become into a big challenge for the network operators. Taking these issues into consideration, the European Union has developed one line of research within the framework of the CROWD project to develop a solution for high density networks and the issue of the users mobility inside this kind of networks. The main goal of this final degree project is to create a control program which, through the software defined network (SDN) paradigm, implements the mobility management of a mobile node, for the cases of network- and host-based mobility. The mobility approach of this project has two different points of view. On the one hand we have implemented a mobility management solution which relies on the network to take care of the mobility of the user. In this network-based scene, the actions to ensure the complete connectivity during the transit of the mobile node amongst two districts are leaded by two different actors, the CROWD Regional Controller (CRC) and the CROWD Local Controller (CLC). This approach is completely transparent to the user attributing all the operations to the controllers and allowing the mobility of the user within the network without doing any specific action. On the other hand, we have the host-based mobility approach. This design also includes the participation of the mobile node during the handover interactions. Its participation consists on creating an IPv6 in IPv4 tunnel between the public IPv4 of the Mobile Node and the public IPv4 of the Default Gateway with which it is anchored to. Mobile Node has to be able to communicate with the CROWD Regional Controller. With these two different approaches, the project aims to create a software solution for the scenario of extremely dense networksIngeniería Informátic

    A Seamless Vertical Handoff Protocol for Enhancing the Performance of Data Services in Integrated UMTS/WLAN Network

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    The Next Generation Wireless Network (NGWN) is speculated to be a unified network composed of several existing wireless access networks such as Wireless Local Area Network (WLAN), Global System for Mobile (GSM), Universal Mobile Telecommunications System (UMTS), Worldwide Interoperability for Microwave Access (WiMAX), and satellite network etc

    Radio Communications

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    In the last decades the restless evolution of information and communication technologies (ICT) brought to a deep transformation of our habits. The growth of the Internet and the advances in hardware and software implementations modified our way to communicate and to share information. In this book, an overview of the major issues faced today by researchers in the field of radio communications is given through 35 high quality chapters written by specialists working in universities and research centers all over the world. Various aspects will be deeply discussed: channel modeling, beamforming, multiple antennas, cooperative networks, opportunistic scheduling, advanced admission control, handover management, systems performance assessment, routing issues in mobility conditions, localization, web security. Advanced techniques for the radio resource management will be discussed both in single and multiple radio technologies; either in infrastructure, mesh or ad hoc networks

    New Challenges in Quality of Services Control Architectures in Next Generation Networks

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    A mesura que Internet i les xarxes IP s'han anat integrant dins la societat i les corporacions, han anat creixent les expectatives de nous serveis convergents així com les expectatives de qualitat en les comunicacions. Les Next Generation Networks (NGN) donen resposta a les noves necessitats i representen el nou paradigma d'Internet a partir de la convergència IP. Un dels aspectes menys desenvolupats de les NGN és el control de la Qualitat del Servei (QoS), especialment crític en les comunicacions multimèdia a través de xarxes heterogènies i/o de diferents operadors. A més a més, les NGN incorporen nativament el protocol IPv6 que, malgrat les deficiències i esgotament d'adreces IPv4, encara no ha tingut l'impuls definitiu.Aquesta tesi està enfocada des d'un punt de vista pràctic. Així doncs, per tal de poder fer recerca sobre xarxes de proves (o testbeds) que suportin IPv6 amb garanties de funcionament, es fa un estudi en profunditat del protocol IPv6, del seu grau d'implementació i dels tests de conformància i interoperabilitat existents que avaluen la qualitat d'aquestes implementacions. A continuació s'avalua la qualitat de cinc sistemes operatius que suporten IPv6 mitjançant un test de conformància i s'implementa el testbed IPv6 bàsic, a partir del qual es farà la recerca, amb la implementació que ofereix més garanties.El QoS Broker és l'aportació principal d'aquesta tesi: un marc integrat que inclou un sistema automatitzat per gestionar el control de la QoS a través de sistemes multi-domini/multi-operador seguint les recomanacions de les NGN. El sistema automatitza els mecanismes associats a la configuració de la QoS dins d'un mateix domini (sistema autònom) mitjançant la gestió basada en polítiques de QoS i automatitza la negociació dinàmica de QoS entre QoS Brokers de diferents dominis, de forma que permet garantir QoS extrem-extrem sense fissures. Aquesta arquitectura es valida sobre un testbed de proves multi-domini que utilitza el mecanisme DiffServ de QoS i suporta IPv6.L'arquitectura definida en les NGN permet gestionar la QoS tant a nivell 3 (IP) com a nivell 2 (Ethernet, WiFi, etc.) de forma que permet gestionar també xarxes PLC. Aquesta tesi proposa una aproximació teòrica per aplicar aquesta arquitectura de control, mitjançant un QoS Broker, a les noves xarxes PLC que s'estan acabant d'estandarditzar, i discuteix les possibilitats d'aplicació sobre les futures xarxes de comunicació de les Smart Grids.Finalment, s'integra en el QoS Broker un mòdul per gestionar l'enginyeria del tràfic optimitzant els dominis mitjançant tècniques de intel·ligència artificial. La validació en simulacions i sobre un testbed amb routers Cisco demostra que els algorismes genètics híbrids són una opció eficaç en aquest camp.En general, les observacions i avenços assolits en aquesta tesi contribueixen a augmentar la comprensió del funcionament de la QoS en les NGN i a preparar aquests sistemes per afrontar problemes del món real de gran complexitat.A medida que Internet y las redes IP se han ido integrando dentro de la sociedad y las corporaciones, han ido creciendo las expectativas de nuevos servicios convergentes así como las expectativas de calidad en las comunicaciones. Las Next Generation Networks (NGN) dan respuesta a las nuevas necesidades y representan el nuevo paradigma de Internet a partir de la convergencia IP. Uno de los aspectos menos desarrollados de las NGN es el control de la Calidad del Servicio (QoS), especialmente crítico en las comunicaciones multimedia a través de redes heterogéneas y/o de diferentes operadores. Además, las NGN incorporan nativamente el protocolo IPv6 que, a pesar de las deficiencias y agotamiento de direcciones IPv4, aún no ha tenido el impulso definitivo.Esta tesis está enfocada desde un punto de vista práctico. Así pues, con tal de poder hacer investigación sobre redes de prueba (o testbeds) que suporten IPv6 con garantías de funcionamiento, se hace un estudio en profundidad del protocolo IPv6, de su grado de implementación y de los tests de conformancia e interoperabilidad existentes que evalúan la calidad de estas implementaciones. A continuación se evalua la calidad de cinco sistemas operativos que soportan IPv6 mediante un test de conformancia y se implementa el testbed IPv6 básico, a partir del cual se realizará la investigación, con la implementación que ofrece más garantías.El QoS Broker es la aportación principal de esta tesis: un marco integrado que incluye un sistema automatitzado para gestionar el control de la QoS a través de sistemas multi-dominio/multi-operador siguiendo las recomendaciones de las NGN. El sistema automatiza los mecanismos asociados a la configuración de la QoS dentro de un mismo dominio (sistema autónomo) mediante la gestión basada en políticas de QoS y automatiza la negociación dinámica de QoS entre QoS brokers de diferentes dominios, de forma que permite garantizar QoS extremo-extremo sin fisuras. Esta arquitectura se valida sobre un testbed de pruebas multi-dominio que utiliza el mecanismo DiffServ de QoS y soporta IPv6. La arquitectura definida en las NGN permite gestionar la QoS tanto a nivel 3 (IP) o como a nivel 2 (Ethernet, WiFi, etc.) de forma que permite gestionar también redes PLC. Esta tesis propone una aproximación teórica para aplicar esta arquitectura de control, mediante un QoS Broker, a las noves redes PLC que se están acabando de estandardizar, y discute las posibilidades de aplicación sobre las futuras redes de comunicación de las Smart Grids.Finalmente, se integra en el QoS Broker un módulo para gestionar la ingeniería del tráfico optimizando los dominios mediante técnicas de inteligencia artificial. La validación en simulaciones y sobre un testbed con routers Cisco demuestra que los algoritmos genéticos híbridos son una opción eficaz en este campo.En general, las observaciones y avances i avances alcanzados en esta tesis contribuyen a augmentar la comprensión del funcionamiento de la QoS en las NGN y en preparar estos sistemas para afrontar problemas del mundo real de gran complejidad.The steady growth of Internet along with the IP networks and their integration into society and corporations has brought with it increased expectations of new converged services as well as greater demands on quality in communications. The Next Generation Networks (NGNs) respond to these new needs and represent the new Internet paradigm from the IP convergence. One of the least developed aspects in the NGNs is the Quality of Service (QoS) control, which is especially critical in the multimedia communication through heterogeneous networks and/or different operators. Furthermore, the NGNs natively incorporate the IPv6 protocol which, despite its shortcomings and the depletion of IPv4 addresses has not been boosted yet.This thesis has been developed with a practical focus. Therefore, with the aim of carrying out research over testbeds supporting the IPv6 with performance guarantees, an in-depth study of the IPv6 protocol development has been conducted and its degree of implementation and the existing conformance and interoperability tests that evaluate these implementations have been studied. Next, the quality of five implementations has been evaluated through a conformance test and the basic IPv6 testbed has been implemented, from which the research will be carried out. The QoS Broker is the main contribution to this thesis: an integrated framework including an automated system for QoS control management through multi-domain/multi-operator systems according to NGN recommendations. The system automates the mechanisms associated to the QoS configuration inside the same domain (autonomous system) through policy-based management and automates the QoS dynamic negotiation between peer QoS Brokers belonging to different domains, so it allows the guarantee of seamless end-to-end QoS. This architecture is validated over a multi-domain testbed which uses the QoS DiffServ mechanism and supports IPv6.The architecture defined in the NGN allows QoS management at level 3 (IP) as well as at level 2 (e.g. Ethernet, WiFi) so it also facilitates the management of PLC networks. Through the use of a QoS Broker, this thesis proposes a theoretical approach for applying this control architecture to the newly standardized PLC networks, and discusses the possibilities of applying it over the future communication networks of the Smart Grids.Finally, a module for managing traffic engineering which optimizes the network domains through artificial intelligence techniques is integrated in the QoS Broker. The validations by simulations and over a Cisco router testbed demonstrate that hybrid genetic algorithms are an effective option in this area.Overall, the advances and key insights provided in this thesis help advance our understanding of QoS functioning in the NGNs and prepare these systems to face increasingly complex problems, which abound in current industrial and scientific applications

    Vertical handover management with quality of service support

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    For mobile usage of the Internet, new preferences might be desired when considering connectivity and handover between overlapped heterogeneous wireless networks. This work presents a cross-layer vertical handover framework, which includes modules for: multi-criteria decisions that support QoS, soft switching between the multiple interfaces of a mobile device, and a light weight signaling scheme for address resolution. The handover decisions are based on user's configuration, network attributes, and node's context information. A connection is transferred onto a new interface only when it is associated to the newly selected network and ready to take over the traffic. The identity of the mobile node is maintained by leveraging the well-known and widely employed NAT for the purpose of mobility management in a new version that we call Dynamic index NAT. DiNAT supports local and global mobility through hierarchical deployment of anchor points. The network simulator OMNeT++ is used to model the system and test its feasibility.Neue Anwendungen und Dienste steigern die Attraktivität der mobilen Nutzung des Internets und fordern die Beibehaltung der Konnektivität auch beim Wechsel zwischen heterogenen drahtlosen Zugangsnetzen, wobei viele Informationen unterschiedlicher Quellen berücksichtigt werden müssen. Auf Basis dieser Informationen müssen Handover-Entscheidungen getroffen werden, die ein Umschalten zwischen den drahtlosen Schnittstellen bewirken und die Identifikation des mobilen Knotens aktualisieren. Die vorliegende Arbeit stellt ein Rahmenwerk für vertikalen Handover vor, das zudem eine Mobilitätsunterstützung beinhaltet. Es verwendet Algorithmen zur multikriteriellen Entscheidung, die eine breite Reihe von Parametern betrachtet, um so die Kommunikationsdienstgüte (Quality of Service, QoS) für Echtzeitanwendungen bereitzustellen. Darüber hinaus wurde eine Strategie für die stabile und weiche Umschaltung zwischen verschiedenen Schnittstellen des mobilen Geräts entwickelt und eine leichtgewichtige Signalisierung für die Adressauflösung zur schnellen Wiederaufnahme der Datenübertragung vorgeschlagen. Die Dissertation beschreibt den schichtenübergreifenden Handover-Ansatz in drei Modulen, deren Konzept und Funktionalität detailliert diskutiert werden. Handover-Entscheidungen werden auf Grundlage von Benutzerpräferenzen, Netzwerkeigenschaften und Kontextinformationen des mobilen Endgeräts getroffen. Eine Verbindung wird nur dann auf eine neue Schnittstelle umgestellt, wenn diese mit dem neu gewählten Netzwerk in Verbindung steht und entsprechend konfiguriert ist. Für die Aktualisierung der Identität des mobilen Knotens wird der bekannte Mechanismus „Network Address Translation“ (NAT) wesentlich erweitert, was als Dynamic index NAT (DiNAT) bezeichnet wird. Sowohl lokale als auch globale Mobilität werden durch eine hierarchische Bereitstellung von DiNAT-fähigen Knoten unterstützt, ohne dass hierzu ein Vorwissen oder die Kooperation der Nachbar-Netzwerke notwendig ist. Viele solcher Knoten können zur Lastverteilung installiert werden, da die Dissertation einen AuswahlmechanismusWith a variety of new applications and services offered for mobile users of the Internet, new usage plans and preferences in connectivity to wireless networks might be desired. Connectivity anywhere and anytime through switching between heterogeneous wireless networks became common communication scenarios for many users. To maintain the connectivity for mobile nodes and the continuity of their running sessions, handover decisions, a proper switching scheme between the wireless interfaces of the communication device, and the identification of mobile nodes must be managed. This work presents a vertical handover framework including a mobility management solution as well. It employs multi-criteria decision algorithms that consider a wide range of parameters, mainly to support Quality of Service (QoS) for real-time applications, applies a strategy for stable and soft switching between the multiple interfaces of the mobile device, and presents a light weight signaling scheme for address resolution to quickly recover running sessions. The handover decisions are based on user’s configuration, network attributes, and node’s context information. A connection is transferred onto a new interface only when it is associated to the newly selected network and ready to take over the traffic. The identity of the mobile node is maintained by leveraging the well-known and widely employed Network Address Translation (NAT) for the purpose of mobility management in a new version that we call Dynamic index NAT (DiNAT). Local and global mobility are supported through hierarchical deployment of DiNAT-enabled anchor points, with no need for pre-knowledge or cooperation of neighbor networks. Many such nodes can be deployed globally for load sharing and route optimization, where a selection mechanism is used to choose a suitable anchor node for each session of a mobile node. The dissertation introduces the proposed approach as a cross-layer system composed of three modules that handle the mentioned tasks, and provides details on the concept of each. The network simulator OMNeT++ is used to model the system and test its feasibility, as compared to a widely adopted solution for mobility management, running real-time applications while moving
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