750 research outputs found
Host mobility management with identifier-locator split protocols in hierarchical and flat networks
Includes abstractIncludes bibliographical references.As the Internet increasingly becomes more mobile focused and overloaded with mobile hosts, mobile users are bound to roam freely and attach to a variety of networks. These different networks converge over an IP-based core to enable ubiquitous network access, anytime and anywhere, to support the provision of services, that is, any service, to mobile users. Therefore, in this thesis, the researcher proposed network-based mobility solutions at different layers to securely support seamless handovers between heterogeneous networks in hierarchical and flat network architectures
Client-based and Cross-layer Optimized Flow Mobility for Android Devices in Heterogeneous Femtocell/Wi-Fi Networks*
AbstractThe number of subscribers accessing Internet resources from mobile and wireless devices has been increasing continually since i-mode, the first mobile Internet service launched in 1999. The handling and support of dramatic growth of mobile data traffic create serious challenges for the network operators. Due to the spreading of WLAN networks and the proliferation of multi-access devices, offloading from 3G to Wi-Fi seems to be a promising step towards the solution. To solve the bandwidth limitation and coverage issues in 3G/4G environments, femtocells became key players. These facts motivate the design and development of femtocell/Wi-Fi offloading schemes. Aiming to support advanced offloading in heterogeneous networks, in this paper we propose a client-based, cross-layer optimized flow mobility architecture for Android devices in femtocell/Wi-Fi access environments. The paper presents the design, implementation and evaluation details of the aforementioned mechanisms
SIP-based mobility management in next generation networks
The ITU-T definition of next generation networks includes the ability to make use of multiple broadband transport technologies and to support generalized mobility. Next generation networks must integrate several IP-based access technologies in a seamless way. In this article, we first describe the requirements of a mobility management scheme for multimedia real-time communication services; then, we report a survey of the mobility management schemes proposed in the recent literature to perform vertical handovers between heterogeneous networks. Based on this analysis, we propose an application-layer solution for mobility management that is based on the SIP protocol and satisfies the most important requirements for a proper implementation of vertical handovers. We also implemented our proposed solution, testing it in the field, and proving its overall feasibility and its interoperability with different terminals and SIP servers
Performance Comparison of Dual Connectivity and Hard Handover for LTE-5G Tight Integration in mmWave Cellular Networks
MmWave communications are expected to play a major role in the Fifth
generation of mobile networks. They offer a potential multi-gigabit throughput
and an ultra-low radio latency, but at the same time suffer from high isotropic
pathloss, and a coverage area much smaller than the one of LTE macrocells. In
order to address these issues, highly directional beamforming and a very
high-density deployment of mmWave base stations were proposed. This Thesis aims
to improve the reliability and performance of the 5G network by studying its
tight and seamless integration with the current LTE cellular network. In
particular, the LTE base stations can provide a coverage layer for 5G mobile
terminals, because they operate on microWave frequencies, which are less
sensitive to blockage and have a lower pathloss. This document is a copy of the
Master's Thesis carried out by Mr. Michele Polese under the supervision of Dr.
Marco Mezzavilla and Prof. Michele Zorzi. It will propose an LTE-5G tight
integration architecture, based on mobile terminals' dual connectivity to LTE
and 5G radio access networks, and will evaluate which are the new network
procedures that will be needed to support it. Moreover, this new architecture
will be implemented in the ns-3 simulator, and a thorough simulation campaign
will be conducted in order to evaluate its performance, with respect to the
baseline of handover between LTE and 5G.Comment: Master's Thesis carried out by Mr. Michele Polese under the
supervision of Dr. Marco Mezzavilla and Prof. Michele Zorz
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Heterogeneous Access: Survey and Design Considerations
As voice, multimedia, and data services are converging to IP, there is a need for a new networking architecture to support future innovations and applications. Users are consuming Internet services from multiple devices that have multiple network interfaces such as Wi-Fi, LTE, Bluetooth, and possibly wired LAN. Such diverse network connectivity can be used to increase both reliability and performance by running applications over multiple links, sequentially for seamless user experience, or in parallel for bandwidth and performance enhancements. The existing networking stack, however, offers almost no support for intelligently exploiting such network, device, and location diversity. In this work, we survey recently proposed protocols and architectures that enable heterogeneous networking support. Upon evaluation, we abstract common design patterns and propose a unified networking architecture that makes better use of a heterogeneous dynamic environment, both in terms of networks and devices. The architecture enables mobile nodes to make intelligent decisions about how and when to use each or a combination of networks, based on access policies. With this new architecture, we envision a shift from current applications, which support a single network, location, and device at a time to applications that can support multiple networks, multiple locations, and multiple devices
Interoperabilidade e mobilidade na internet do futuro
Research on Future Internet has been gaining traction in recent years,
with both evolutionary (e.g., Software Defined Networking (SDN)-
based architectures) and clean-slate network architectures (e.g., Information
Centric Networking (ICN) architectures) being proposed. With
each network architectural proposal aiming to provide better solutions
for specific Internet utilization requirements, an heterogeneous Future
Internet composed by several architectures can be expected, each targeting
and optimizing different use case scenarios. Moreover, the increasing
number of mobile devices, with increasing capabilities and
supporting different connectivity technologies, are changing the patterns
of traffic exchanged in the Internet.
As such, this thesis focuses on the study of interoperability and mobility
in Future Internet architectures, two key requirements that need to be
addressed for the widely adoption of these network architectures. The
first contribution of this thesis is an interoperability framework that,
by enabling resources to be shared among different network architectures,
avoids resources to be restricted to a given network architecture
and, at the same time, promotes the initial roll out of new network
architectures. The second contribution of this thesis consists on the
development of enhancements for SDN-based and ICN network architectures
through IEEE 802.21 mechanisms to facilitate and optimize
the handover procedures on those architectures. The last contribution
of this thesis is the definition of an inter-network architecture mobility
framework that enables MNs to move across access network supporting
different network architectures without losing the reachability to
resources being accessed. All the proposed solutions were evaluated
with results highlighting the feasibility of such solutions and the impact
on the overall communication.A Internet do Futuro tem sido alvo de vários estudos nos últimos anos,
com a proposta de arquitecturas de rede seguindo quer abordagens
evolutionárias (por exemplo, Redes Definidas por Software (SDN))
quer abordagens disruptivas (por exemplo, Redes Centradas na Informação (ICN)). Cada uma destas arquitecturas de rede visa providenciar
melhores soluções relativamente a determinados requisitos de
utilização da Internet e, portanto, uma Internet do Futuro heterogénea
composta por diversas arquitecturas de rede torna-se uma possibilidade,
onde cada uma delas é usada para optimizar diferentes casos
de utilização. Para além disso, o aumento do número de dispositivos
móveis, com especificações acrescidas e com suporte para diferentes
tecnologias de conectividade, está a mudar os padrões do tráfego na
Internet.
Assim, esta tese foca-se no estudo de aspectos de interoperabilidade e
mobilidade em arquitecturas de rede da Internet do Futuro, dois importantes
requisitos que necessitam de ser satisfeitos para que a adopção
destas arquitecturas de rede seja considerada. A primeira contribuição
desta tese é uma solução de interoperabilidade que, uma vez que permite
que recursos possam ser partilhados por diferentes arquitecturas
de rede, evita que os recursos estejam restringidos a uma determinada
arquitectura de rede e, ao mesmo tempo, promove a adopção de novas
arquitecturas de rede. A segunda contribuição desta tese consiste
no desenvolvimento de extensões para arquitecturas de rede baseadas
em SDN ou ICN através dos mecanismos propostos na norma IEEE
802.21 com o objectivo de facilitar e optimizar os processos de mobilidade
nessas arquitecturas de rede. Finalmente, a terceira contribuição
desta tese é a definição de uma solução de mobilidade envolvendo diferentes
arquitecturas de rede que permite a mobilidade de dispositivos
móveis entre redes de acesso que suportam diferentes arquitecturas de
rede sem que estes percam o acesso aos recursos que estão a ser acedidos.
Todas as soluções propostas foram avaliadas com os resultados
a demonstrar a viabilidade de cada uma das soluções e o impacto que
têm na comunicação.Programa Doutoral em Informátic
Flexible Multimodal Sub-Gigahertz Communication for Heterogeneous Internet of Things Applications
To realize low-power and low-cost wireless communication over long distances, several wireless standards using sub-1 GHz frequencies have recently been proposed, each with their own strengths and weaknesses in terms of coverage, energy consumption, and throughput. However, none of them are currently flexible enough to satisfy the requirements of future dynamic and heterogeneous IoT applications. To alleviate this, a novel architecture that uses a multimodal device for flexibly employing a variety of heterogeneous sub-1 GHz wireless networks is proposed. It greatly increases network flexibility, resilience, and performance. A device design is presented together with an abstraction layer that combines the different networks into a single flexible virtual network substrate. The article elaborates on the qualitative advantages of this approach. Measurement-based simulation results show advantages in terms of energy efficiency, with significant reduction in energy use compared to a single-technology solution in a representative IoT track and trace scenario. Finally, the article identifies several open research challenges that need to be resolved to fully realize this vision of flexible multimodal communication for demanding IoT applications
Design and development of a software architecture for seamless vertical handover in mobile communications
In this work I firstly present an overview on current wireless
technology and network mobility focusing on
challenges and issues which arise when mobile nodes migrate among
different access networks, while employing real-time communications and
services. In literature many solutions propose different methods and
architectures to enhance vertical handover, the process of transferring a
network communication between two technologically different points of
attachment. After an extensive review of such solutions this document
describes my personal implementation of a fast vertical handover
mechanism for Android smartphones. I also performed a
reliability and performance comparison
between the current Android system and my enhanced architecture which have
both been tested in a
scenario where vertical handover was taking place between WiFi and cellular
network while the mobile node was using video streaming services.
Results show the approach of my implementation to be promising, encouraging
future works, some of which are suggested at the end of this dissertation
together with concluding remarks
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