QoS Specification and Management in a Middleware for Distributed Multimedia Systems

Lopes, Alice Casimiro; Amaro, Fausto; Elias, Glêdson; Lemos, Guido; Magalhães, Mauricio Ferreira

doi:10.1109/aina.2006.280

Cited by 4 publications

(2 citation statements)

References 3 publications

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“…The VRT emphasizes scalability as an important role in multimedia applications scenarios, imposing distributed management of heterogeneous resources and the support for adapting the different underlying management algorithms. [4] addresses the fact that audio and video QoS requirements can become more complex when applications are executed in different platforms including different technologies, and proposes a QoS management and specification model to support adaptation in middleware for distributed multimedia systems. Adaptation is also a key feature for a wireless pervasive computing system.…”

Section: Introductionmentioning

confidence: 99%

Experimental Characterization and Modeling of the QoS for Real Time Audio and Video Transmission

Amazonas¹,

Barra²

2006

Journal of Communication and Information Systems

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Multimedia applications have intrinsic quality of service (QoS) requirements. However, a quantitative evaluation of the QoS offered by the network is rarely realized. Furthermore, the traditional methods for ensuring an end-to-end QoS rely on mechanisms provided by the distribution network. In this paper we propose a new quantitative QoS model that is validated by extensive experimental characterization of the QoS dependence on traffic parameters. This model is then used to design a QoS restoration technique that is independent of special resources available in the distribution network.

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Section: Introductionmentioning

confidence: 99%

Experimental Characterization and Modeling of the QoS for Real Time Audio and Video Transmission

Amazonas¹,

Barra²

2006

Journal of Communication and Information Systems

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“…Uma limitação de QuO nesse processo consiste em tentar melhorar a QoS sem verificar a consistência da ação. Ou seja, o processo verifica apenas se o componente servidor pode oferecer um nível melhor de QoS e, sem analisar se a plataforma do cliente suporta esta QoS, o suporte dá início ao processo de adaptação[83] [84]. Assim, uma aplicação que estiver na região de maior QoS suportada pela plataforma ficará tentando ir para uma região de melhor QoS, embora não exista tal região.$JLORVAgilos[133] define um IUDPHZRUN no nível do PLGGOHZDUH que provê suporte para adaptação de QoS.…”

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Um framework para configuração e gerenciamento de recursos e componentes em sistemas multimidia distribuidos abertos

Lopes¹,

Magalhães²

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Em sistemas multimídia distribuídos existe uma diversidade de dispositivos de hardware, sistemas operacionais e tecnologias de comunicação. Para tratar os requisitos destas aplicações, os componentes do sistema precisam interagir entre eles considerando os aspectos de QoS de cada um dos elementos envolvidos. Neste contexto, esta tese apresenta o Cosmos -um IUDPHZRUN baseado em componentes proposto para dar suporte à configuração e gerenciamento de recursos em sistemas multimídia. Como prova de conceito do Cosmos, o IUDPHZRUN definido foi usado no projeto do PLGGOHZDUH AdapTV -um PLGGOHZDUH para sistemas de televisão digital interativa. O projeto do AdapTV explora os principais componentes dos modelos que foram definidos no Cosmos: o modelo de descrição de aplicações de forma independente de linguagens; o modelo de interconexão, que trata as questões de comunicação entre componentes heterogêneos usando diferentes tecnologias de comunicação; e o modelo de gerenciamento de QoS, que permite o monitoramento e a adaptação do sistema. Estes modelos foram explorados na implementação de um protótipo do PLGGOHZDUH AdapTV e de uma aplicação distribuída que realiza a captura, transmissão e apresentação de um fluxo de vídeo. Para dar suporte à reusabilidade, o modelo explora o conceito de propriedades para estabelecer acordos de configuração (estáticos e dinâmicos) envolvendo negociações entre os requisitos dos componentes e as características da plataforma.3DODYUDVFKDYH: Componentes de VRIWZDUH, sistemas multimídia distribuídos, PLGGOHZDUH adaptativo, televisão digital interativa. $EVWUDFWDistributed multimedia applications involve a diversity of hardware devices, operating systems and communication technologies. In order to fulfill the requirements of such applications, their constituting components need to interact with each other, as well as to consider QoS issues related to devices and transmission media. In such a context, this thesis presents the Cosmos component-based framework for configuration and management of resources of open, distributed multimedia systems. As a proof of concept, the framework was used in the design of the AdapTV middleware -a middleware for interactive television which explores the major components of the Cosmos, including: the model to describe and represent applications independently of language aspects; the interconnection model that allows communication between components in heterogeneous and distributed multimedia environments; and the QoS management model that provides support for adaptation in the middleware layer, triggered by QoS and user requirements changes. These models have been explored in the implementation of a prototype, which includes the AdapTV middleware and a distributed application example that captures, transmits and presents a video flow. In order to provide a generic and reusable approach, and to establish configuration agreements among component requirements and platform features, the framework explores the concept of properties.

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A meta-component model for dynamic adaptation support in a middleware system for interactive tv

Lopes¹,

Silva²,

Elias

et al. 2006

Proceedings of the 12th Brazilian Symposium on Multimedia and the Web

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QoS Specification and Management in a Middleware for Distributed Multimedia Systems

Cited by 4 publications

References 3 publications

Experimental Characterization and Modeling of the QoS for Real Time Audio and Video Transmission

Experimental Characterization and Modeling of the QoS for Real Time Audio and Video Transmission

Um framework para configuração e gerenciamento de recursos e componentes em sistemas multimidia distribuidos abertos

A meta-component model for dynamic adaptation support in a middleware system for interactive tv

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