Rozprawy doktorskie na temat „Mobile wireless computing networks”
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Datla, Dinesh. "Wireless Distributed Computing in Cloud Computing Networks". Diss., Virginia Tech, 2013. http://hdl.handle.net/10919/51729.
Pełny tekst źródłaPh. D.
Yang, Zhimin. "Opportunistic Computing in Wireless Networks". The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1267743144.
Pełny tekst źródłaKang, Jong Hee. "Location-aware information access through wireless networks /". Thesis, Connect to this title online; UW restricted, 2006. http://hdl.handle.net/1773/6878.
Pełny tekst źródłaLi, Yue. "Edge computing-based access network selection for heterogeneous wireless networks". Thesis, Rennes 1, 2017. http://www.theses.fr/2017REN1S042/document.
Pełny tekst źródłaTelecommunication 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
Jayaram, Rajeev 1971. "Quality-of-Service Provisioning and Resource Reservation Mechanisms for Mobile Wireless Networks". Thesis, University of North Texas, 1998. https://digital.library.unt.edu/ark:/67531/metadc278542/.
Pełny tekst źródłaLong, Men Wu Chwan-Hwa. "Roaming authentication and end-to-end authentication in wireless security". Auburn, Ala., 2005. http://repo.lib.auburn.edu/2005%20Summer/doctoral/LONG_MEN_56.pdf.
Pełny tekst źródłaSamii, Etienne. "Usability design for location based mobile services in wireless metropolitan networks". Hamburg Diplomica-Verl, 2006. http://d-nb.info/987370928/04.
Pełny tekst źródłaMahmoud, Qusay H. "Evolution of network computing paradigms : applications of mobile agents in wired and wireless networks". Thesis, Middlesex University, 2002. http://eprints.mdx.ac.uk/10745/.
Pełny tekst źródłaSanadhya, Shruti. "Ultra-mobile computing: adapting network protocol and algorithms for smartphones and tablets". Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/52959.
Pełny tekst źródłaKanter, Theo. "Adaptive Personal Mobile Communication, Service Architecture and Protocols". Doctoral thesis, KTH, Microelectronics and Information Technology, IMIT, 2001. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3273.
Pełny tekst źródłaLiu, Huanjin. "Free roaming: A system for ubiquitous computing". CSUSB ScholarWorks, 2006. https://scholarworks.lib.csusb.edu/etd-project/3062.
Pełny tekst źródłaHasir, Ibrahim. "The Effect of Mobility on Wireless Sensor Networks". Thesis, University of North Texas, 2014. https://digital.library.unt.edu/ark:/67531/metadc699868/.
Pełny tekst źródłaFalcon, Martinez Rafael Jesus. "Towards Fault Reactiveness in Wireless Sensor Networks with Mobile Carrier Robots". Thèse, Université d'Ottawa / University of Ottawa, 2012. http://hdl.handle.net/10393/22685.
Pełny tekst źródłaHansen, Jarle. "An investigation of smartphone applications : exploring usability aspects related to wireless personal area networks, context-awareness, and remote information access". Thesis, Brunel University, 2012. http://bura.brunel.ac.uk/handle/2438/6518.
Pełny tekst źródłaBenchi, Abdulkader. "Middleware Systems for Opportunistic Computing in Challenged Wireless Networks". Thesis, Lorient, 2015. http://www.theses.fr/2015LORIS372/document.
Pełny tekst źródłaOpportunistic networks (OppNets) constitute an appealing solution to complement fixed network infrastructures –or make up for the lack thereof– in challenged areas. Researches in the last few years have mostly addressed the problem of supporting networking in OppNets, yet this can only be a first step towards getting real benefit from these networks. Opportunistic computing goes beyond the concept of opportunistic networking, and provides a new paradigm to enable collaborative computing tasks in such environments. In the realm of opportunistic computing, properly designing, implementing and deploying distributed applications are important tasks. An OppNet-dedicated application must be able to operate and maintain an acceptable level of service while addressing the many problems that can occur in these networks, such as disconnections, partitioning, long transmission delays, transmission failures, resource constraints, frequent changes in topology, and heterogeneous devices. Much of the complexity and cost of building OppNet-dedicated applications can be alleviated by the use of high-level programming models. Such models can be supported by middleware systems capable of transparently addressing all the above-mentioned problems. The work reported in this dissertation focused on providing insight into the fundamental problems posed by OppNets, so as to analyze and solve the problems faced by application developers while dealing with these environments. The research focused on identifying well-known high-level programming models that can be satisfactorily implemented for OppNets, and that can prove useful for application developers. In order to demonstrate the feasibility of application development for OppNets, while assessing the benefits brought about by carefully designed middleware systems, a couple of such systems have been designed, implemented, and evaluated as part of this work. These middleware systems respectively support distributed messaging (through message queues and topics), the tuple-space model, and consensus solving in OppNets. They are supplemented with fully-functional implementations, that can be used in real settings, and that are all distributed under the terms of the GNU General Public License (GPL). Real-life experiments and simulations have been realized so as to evaluate the effectiveness and efficiency of these systems in real conditions
Lee, Young-Jun. "Routing and Efficient Evaluation Techniques for Multi-hop Mobile Wireless Networks". Diss., Georgia Institute of Technology, 2005. http://hdl.handle.net/1853/7455.
Pełny tekst źródłaRaad, Raad. "Neuro-fuzzy admission control in mobile communications systems". Access electronically, 2005. http://www.library.uow.edu.au/adt-NWU/public/adt-NWU20061030.153500/index.html.
Pełny tekst źródłaBani, Yassein Muneer O. "On the performance of probabilistic flooding in wireless mobile ad hoc networks". Thesis, Connect to e-thesis, 2006. http://theses.gla.ac.uk/720/.
Pełny tekst źródłaPh.D. thesis submitted to the Faculty of Information and Mathematical Sciences, University of Glasgow, 2006. Includes bibliographical references. Print version also available.
Gonzalez, Valenzuela Sergio. "A service-oriented approach to topology formation and resource discovery in wireless ad-hoc networks". Thesis, University of British Columbia, 2008. http://hdl.handle.net/2429/745.
Pełny tekst źródłaGeorge, Glyco. "Bounded Dynamic Source Routing in Mobile Ad Hoc Networks". Thesis, University of North Texas, 2003. https://digital.library.unt.edu/ark:/67531/metadc4264/.
Pełny tekst źródłaUnal, Halim Unsem. "Implementation Of A Wireless Streaming System For Universal Multimedia Access". Master's thesis, METU, 2003. http://etd.lib.metu.edu.tr/upload/4/1057652/index.pdf.
Pełny tekst źródłas, mobile PC&rsquo
s and personal digital assistants (PDA). The system is built on client/server architecture. Video data is H.263 coded and carried over RTP. Java Media Framework is utilized and its capabilities are extended with special plug-ins when necessary.
Wohlers, Felix Ricklef Scriven. "Delay-tolerant data collection in sensor networks with mobile sinks". Thesis, University of Oxford, 2012. http://ora.ox.ac.uk/objects/uuid:734533bd-04a2-47f3-9213-f326a5449029.
Pełny tekst źródłaJun, Hyewon. "Power Management in Disruption Tolerant Networks". Diss., Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/19879.
Pełny tekst źródłaKrishnakumar, Sita Srinivasaraghavan. "Intelligent actor mobility in wireless sensor and actor networks". Diss., Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/24735.
Pełny tekst źródłaCommittee Chair: Abler, Randal T.; Committee Member: Copeland, John A.; Committee Member: Haas, Kevin; Committee Member: Moore II, Elliot; Committee Member: Owen III, Henry L.
Vassiliou, Vasos. "An integration framework and a signaling protocol for MPLS/DiffServ/HMIP radio access networks". Diss., Georgia Institute of Technology, 2002. http://hdl.handle.net/1853/13732.
Pełny tekst źródłaSun, Zhaohui, i n/a. "Improving Security in WLAN With the Use of Smart Antennas". Griffith University. School of Engineering, 2006. http://www4.gu.edu.au:8080/adt-root/public/adt-QGU20070115.143811.
Pełny tekst źródłaSun, Zhaohui. "Improving Security in WLAN With the Use of Smart Antennas". Thesis, Griffith University, 2006. http://hdl.handle.net/10072/366543.
Pełny tekst źródłaThesis (Masters)
Master of Philosophy (MPhil)
School of Engineering
Full Text
Tran-Thi-Thuy, Trang. "Secure data aggregation for wireless sensor network". Thesis, Norwegian University of Science and Technology, Department of Telematics, 2010. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-10912.
Pełny tekst źródłaKeshariya, Mayank. "Extended Policy-Based Management Framework to Provide Always Best Connected Services in Heterogeneous Mobile Environments". Thesis, University of Canterbury. Computer Science and Software Engineering, 2009. http://hdl.handle.net/10092/2549.
Pełny tekst źródłaTsao, Cheng-Lin. "Rapid application mobilization and delivery for smartphones". Diss., Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/49022.
Pełny tekst źródłaNguyen, Van Minh. "Wireless Link Quality Modelling and Mobility Management for Cellular Networks". Phd thesis, Telecom ParisTech, 2011. http://tel.archives-ouvertes.fr/tel-00702798.
Pełny tekst źródłaBanh, Mai. "Quantification, characterisation and impact evaluation of mobile IPv6 hand off times". Australasian Digital Thesis Program, 2007. http://adt.lib.swin.edu.au/public/adt-VSWT20070608.094836/index.html.
Pełny tekst źródła[A thesis submitted in total fulfillment of the requirements of for the degree of ] Masters of Engineering by Research, Centre for Advanced Internet Architectures (CAIA), Faculty of Information and Communication Technologies, Swinburne University of Technology, 2005. Typescript. Bibliography p. 153-159.
Zhang, Huiqi. "Socioscope: Human Relationship and Behavior Analysis in Mobile Social Networks". Thesis, University of North Texas, 2010. https://digital.library.unt.edu/ark:/67531/metadc30533/.
Pełny tekst źródłaSakai, Kazuya. "Security and Privacy in Large-Scale RFID Systems". The Ohio State University, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=osu1386006971.
Pełny tekst źródłaCheung, Kin Pong. "Performance evaluation of scheduling algorithms on Bluetooth piconet and scatternet network /". View Abstract or Full-Text, 2002. http://library.ust.hk/cgi/db/thesis.pl?COMP%202002%20CHEUNG.
Pełny tekst źródłaIncludes bibliographical references (leaves 63-66). Also available in electronic version. Access restricted to campus users.
Chung, W. Y. (Wan-Young). "Ubiquitous healthcare system based on a wireless sensor network". Doctoral thesis, University of Oulu, 2009. http://urn.fi/urn:isbn:9789514292903.
Pełny tekst źródłaWu, Hao. "Analysis and Design of Vehicular Networks". Diss., Georgia Institute of Technology, 2005. http://hdl.handle.net/1853/7639.
Pełny tekst źródłaBenin, Joseph Thomas. "Unified distribution of pseudonyms in hybrid ephemeral vehicular networks". Diss., Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/45910.
Pełny tekst źródłaAllam, Sean. "A model to measure the maturuty of smartphone security at software consultancies". Thesis, University of Fort Hare, 2009. http://hdl.handle.net/10353/281.
Pełny tekst źródłaGikaru, Wilfred Githuka. "Mobility based routing overhead management in reconfigurable wireless ad hoc networks". Doctoral thesis, [S.l. : s.n.], 2004. http://deposit.ddb.de/cgi-bin/dokserv?idn=97340423X.
Pełny tekst źródłaLi, Yingjie. "Information dissemination and routing in communication networks". Columbus, Ohio : Ohio State University, 2005. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1132767756.
Pełny tekst źródłaOliveira, Filho Jorge Lima de 1979. "Uma arquitetura para gerência de mobilidade cognitiva em redes sem fio heterogêneas". [s.n.], 2013. http://repositorio.unicamp.br/jspui/handle/REPOSIP/275635.
Pełny tekst źródłaTese (doutorado) - Universidade Estadual de Campinas, Instituto de Computação
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Resumo: Atualmente há uma necessidade das pessoas estarem conectadas a todo o momento e em qualquer lugar utilizando seus MNs (Mobile Nodes) para realizarem suas tarefas. É desejável uma Internet disponível a todo instante. Porém, a integração das redes sem fio de tecnologias diferentes apresenta vários desafios, como por exemplo, manter a continuidade dos serviços que rodam no MN quando há uma troca de rede. Percebendo a demanda crescente por mobilidade e de uma necessidade de uma Internet ubíqua, o IEEE padronizou um conjunto de serviços e protocolos com o intuito de integrar as redes de diferentes tecnologias denominadas IEEE 802.21. Entretanto, não fazem parte do padrão alguns mecanismos necessários para suportar mobilidade nas redes heterogêneas, como por exemplo, o algoritmo de decisão para a escolha da rede e o mecanismo de gerência de handover. Além disso, a demanda por mobilidade exige um mecanismo de gerência diferenciado devido à heterogeneidade dos elementos e a dinâmica do ambiente das redes sem fio heterogêneas. Para lidar com esses desafios, este trabalho apresenta uma arquitetura de gerência de mobilidade cognitiva para redes sem fio heterogêneas. Essa arquitetura é baseada no IEEE 802.21 e é capaz de integrar diversas redes com tecnologias diferentes e de suportar mobilidade mantendo a continuidade dos serviços quando o MN troca de uma rede para outra. Foi desenvolvido para esta arquitetura um algoritmo cognitivo de decisão de handover que seleciona as redes baseado nas experiências prévias dos MNs. Esse algoritmo utiliza como métrica de decisão as perdas dos fluxos TCP configurados nos MNs. O módulo cognitivo embutido na arquitetura foi uma evolução do resultado de pesquisa da nossa proposta de um algoritmo cognitivo para reconfiguração dos parâmetros do IEEE 802.11, denominado CogMAC. O CogMAC é uma proposta descentralizada, ou seja, os MNs que o implementam não possuem uma visão total da rede, cada MN individualmente é capaz de monitorar o desempenho e reconfigurar os parâmetros da subcamada MAC para evitar degradação do desempenho devido a mudanças nas condições da rede. O CogMAC é avaliado através de simulações e de um testbed real e os resultados comparados confirmam sua eficácia. Já a arquitetura de gerência cognitiva é avaliada através de simulações, e os resultados são comparados com o algoritmo que prioriza a conexão das redes WiFi. Os resultados obtidos confirmam também o bom desempenho da arquitetura proposta
Abstract: The mobile nodes (MNs) have become popular nowadays, the rapid increase in the use of wireless technologies has changed the behavior of individuals and businesses in the way they communicate. Currently, there is a demand for people to be connected all time and everywhere by using their MNs to perform their tasks. It is desirable to have a ubiquitous Internet, available at any moment and everywhere. However, the integration of heterogeneous wireless networks introduces several challenges. One of the most challenging issues is service continuity during handovers. As a result of the high demand for mobility, IEEE has created a set of services and protocols in order to integrate heterogeneous networks, called IEEE 802.21. However, there are no mechanisms in the standard in order to support mobility in heterogeneous networks, such as decision algorithms and mechanisms to perform the handover. Moreover, the mobility demand requires a special management mechanism due to the elements' diversity and the dynamic environment of the heterogeneous wireless networks. In order to tackle these challenges, this work presents cognitive mobility management architecture for heterogeneous wireless networks. This architecture is based on the IEEE 802.21 and is able to integrate different networks with different technologies and supporting mobility while maintaining service continuity when the MN performs a handover. A handover decision algorithm was developed for this architecture to select networks based on the previous experiences of MNs. This algorithm uses as decision metric the TCP loss in the MNs. The cognitive module in the architecture is an evolution of research results of our proposed algorithm for reconfiguration of cognitive parameters of the IEEE 802.11, called CogMAC. The CogMAC is a completely distributed proposal capable to monitor the MAC layer performance and react to changes to avoid performance degradation. The CogMAC is evaluated by simulations and real testbed and the results are compared with the first-WiFi algorithm. This algorithm prioritizes the connection of WiFi networks. The results also confirm the good performance of the proposed architecture
Doutorado
Ciência da Computação
Doutor em Ciência da Computação
Iwasaki, Yohei, Nobuo Kawaguchi i Yasuyoshi Inagaki. "Azim : Direction-Based Service System for Both Indoors and Outdoors". IEICE, 2005. http://hdl.handle.net/2237/7820.
Pełny tekst źródłaMahfoudh, Saoucene. "Energy efficiency in wireless ad hoc and sensor networks : routing, node activity scheduling and cross-layering". Phd thesis, Université Pierre et Marie Curie - Paris VI, 2010. http://tel.archives-ouvertes.fr/tel-00757251.
Pełny tekst źródłaBanh, Mai Thi Quynh, i n/a. "Quantification, characterisation and impact evaluation of mobile IPv6 hand off times". Swinburne University of Technology, 2005. http://adt.lib.swin.edu.au./public/adt-VSWT20070608.094836.
Pełny tekst źródłaGomes, Diego Souza. "Acesso Móvel aos Serviços do Middleware InteGrade". Universidade Federal do Maranhão, 2009. http://tedebc.ufma.br:8080/jspui/handle/tede/425.
Pełny tekst źródłaMobile computing technologies and wireless networks have evolved very quickly. Nowadays, many of the portable devices have significant processing power, storage and communication capacity. At the same time, grid computing technology became an important tool for collaborative work among users and organizations enabling the sharing of computing resources and services through multiple administrative domains. Due to the popularity of mobile computing, users of handheld devices form an important and new segment of the computing grid, assuming both the role of consumers and providers of resources and services. The integration of these two categories of distributed systems aims to extend the capabilities of portable devices, enabling access to a infrastructure of shared resources, as well as provide faster and easier means for grid services users to access information produced by these systems at any time and place. This work describes the MInteGrade (Mobile InteGrade), a software infrastructure that provides access to the InteGrade grid middleware from mobile devices connected through IEEE 802.11 wireless networks in infrastructure mode, and Bluetooth networks in Ad hoc mode. Through this mechanism for access to a computational grid, mobile clients can request the execution of applications on the grid, monitor the execution of applications and view the computation results already completed. The MInteGrade was designed so as to consider the dynamics of wireless networks. Specifically, it supports disconnections of devices and dynamic changes of the Ad hoc network topology, aswell as content adaptation of the output of the grid computations.
Tecnologias de computação móvel e de redes sem fio têm evoluído muito rapidamente, de forma que muitos dos dispositivos portáteis possuem atualmente considerável capacidade de processamento, armazenamento e comunicação. Paralelo a isso, a tecnologia de grades computacionais se consolidou como um ferramental importante para o trabalho colaborativo entre usuários e organizações, através do compartilhamento de recursos e serviços computacionais entre múltiplos domínios administrativos. Devido a esta popularização da computação móvel, usuários de dispositivos portáteis formam um importante e novo segmento da computação em grade, assumindo tanto o papel de usuários como também de provedores de recursos e serviços. A integração dessas duas categorias de sistemas distribuídos, objetiva estender as capacidades dos dispositivos computacionais móveis através do acesso a uma infra-estrutura de recursos compartilhados, além de fornecer aos usuários de serviços de grade meios mais rápidos e fáceis de acesso as informações produzidas por estes sistemas em qualquer hora e lugar. Este trabalho descreve oMInteGrade (Mobile InteGrade), uma infra-estrutura de software para acesso aos serviços do middleware de grade InteGrade a partir de dispositivos móveis conectados através de redes sem fio IEEE 802.11 em modo infraestruturado e redes bluetooth em modo Ad hoc. Através deste mecanismo para acesso a uma grade de computadores, clientes móveis podem solicitar a execução de aplicações na grade, realizar o acompanhamento da execução das aplicações e visualizar o resultado de computações já concluídas. O MInteGrade foi projetado para levar em consideração o dinamismo das redes sem fio, provendo suporte a períodos de desconexão e variações na topologia das redes Ad hoc, bem como a adaptação de conteúdo dos resultados das computações realizadas pela grade.
Ergüt, Salih. "Context-aware computing for wireless networks". Diss., [La Jolla] : University of California, San Diego, 2010. http://wwwlib.umi.com/cr/ucsd/fullcit?p3402341.
Pełny tekst źródłaTitle from first page of PDF file (viewed May 14, 2010). Available via ProQuest Digital Dissertations. Vita. Includes bibliographical references.
Meneguette, Rodolfo Ipolito 1984. "Uma arquitetura de gerência de mobilidade para redes veiculares". [s.n.], 2013. http://repositorio.unicamp.br/jspui/handle/REPOSIP/275504.
Pełny tekst źródłaTese (doutorado) - Universidade Estadual de Campinas, Instituto de Computação
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Resumo: Redes Ad Hoc Veiculares (VANETs) constituem uma subclasse das redes Ad Hoc móveis que provê uma conexão sem fio entre veículos bem como entre veículos e dispositivos de acostamento. Essas redes proveem aplicações que focam na segurança do condutor, em fornecer maior eficiência do tráfego dos veículos nas vias públicas e em trazer algum conforto e entretenimento para os passageiros ao longo de sua viagem. Algumas dessas aplicações precisam estar conectadas com a internet através de um ponto de acesso que encontra-se no acostamento, como uma torre celular ou uma torre WiFi. Essa conexão pode gerar uma sobrecarga de mensagens de controle e pode sofrer uma troca de ponto de acesso que impacta no desempenho da aplicação. Além da interface de conexão com o ponto de acesso, o veículo é equipado com várias outras interfaces de redes vinculadas a diferentes tecnologias, podendo tirar vantagens do uso simultâneo dessas diversas interfaces de rede, com isso, maximizando a vazão e diminuindo a latência. Entretanto, esse uso pode aumentar ainda mais a sobrecarga das mensagens de controle, tendo como consequencia o aumento do tempo de troca de um ponto de acesso a outro, afetando a vazão da rede e o seu desempenho. Para superar esses desafios e prover uma boa qualidade de serviço para a aplicação, ou seja, atender aos requisitos mínimos que as aplicações das redes veiculares necessitam, desenvolvemos e avaliamos uma arquitetura para o gerenciamento de mobilidade de fluxo baseado nas classes de aplicações das redes veiculares. A arquitetura tem como objetivo minimizar o tempo da troca de conexão do fluxo, diminuir a quantidade de perda de pacotes e diminuir o tempo de entrega das mensagens, a fim de cumprir com os requisitos mínimos das classes de aplicação veicular, bem como maximizar o desempenho das aplicações. A arquitetura foi implementada no Network Simulator versão 3 para análise do comportamento da arquitetura em diversos tipos de cenário de simulação. Além da análise da arquitetura, também foram analisados alguns dos seus módulos separadamente. O resultado dessas análises, tanto dos módulos como da arquitetura, mostrou que a arquitetura proposta apresentou um baixo tempo de entrega, com menor perda de pacotes e menor atraso
Abstract: Vehicular Ad Hoc Networks (VANETs) constitutes a subclass of mobile Ad Hoc Networks that provides a wireless connection between vehicles and between vehicles and roadside devices. These networks provide applications that focus on driver safety, traffic efficiency of vehicles on public roads, and in the comfort and entertainment to passengers throughout their journey. Some of these applications need to be connected to the Internet via an access point in the roadside, like a cell tower or WiFi tower. This connection can generate an overhead of control messages and could suffer a change of access point that can impact the performance of the application. Besides the interface connected to the access point, the vehicle is equipped with other network interfaces linked with different technologies, thus the vehicular application can take advantage of the simultaneous use of these various network interfaces, thereby maximizing throughput and reducing latency. However, this use can increase the overhead of control message, and the time of exchange of one access point to another, thus affecting the network throughput and consequently the performance of the application. To overcome these challenges and provide a good quality of service to the application, i.e., attend the minimum requirements that applications for vehicular networks need, we developed and evaluated an architecture for flow mobility management based on classes of applications of vehicular networks. The architecture aims to minimize the time of the exchange of the connection flow, decrease the amount of packet loss, and reduce the delivery time of messages in order to comply with the minimum requirements for vehicular application classes as well as to maximize the application performance. The architecture was implemented in Network Simulator version 3 to analyze the behavior of the architecture in various types of scenarios. Besides the analysis of the architecture, we also analyzed some of the modules of the architecture separately. The results of these analyses of both the architecture and its modules showed a low delivery time, lower packet loss and lower delay
Doutorado
Ciência da Computação
Doutor em Ciência da Computação
Haghnegahdar, Alireza. "Interference in wireless mobile networks". Thesis, University of British Columbia, 2014. http://hdl.handle.net/2429/46713.
Pełny tekst źródłaChen, Xuetao. "Resource Allocation for Wireless Distributed Computing Networks". Diss., Virginia Tech, 2012. http://hdl.handle.net/10919/77054.
Pełny tekst źródłaPh. D.