Implementando cenários em redes de computadores com Network Simulator (NS-2): uma abordagem prática

Carlos Eduardo Arruda de Souza; Ciro Ferreira de Carvalho Júnior; Paulo Sampaio

doi:10.35819/scientiatec.v4i3.2441

Implementando cenários em redes de computadores com Network Simulator (NS-2): uma abordagem prática

ScientiaTec ◽

10.35819/scientiatec.v4i3.2441 ◽

2018 ◽

Vol 4 (3) ◽

pp. 189-207

Author(s):

Carlos Eduardo Arruda de Souza ◽

Ciro Ferreira de Carvalho Júnior ◽

Paulo Sampaio

Keyword(s):

Network Simulator ◽

Bit Rate ◽

Constant Bit Rate

Este artigo tem como objetivo apresentar um estudo referente ao conceito de Qualidade de Serviço (QoS) em cenários típicos de tráfego inelásticos, ou seja, sensíveis às alterações das condições da rede e que se encontram representados neste trabalho por aplicações com uma taxa de bits constante ou do tipo Constant Bit Rate (CBR). Para ilustrar estes cenários, a ferramenta de simulação de redes, NS-2, foi empregada e, por intermédio da consulta em fontes primárias, secundárias e sítios da internet foram investigados os conceitos que envolvem a QoS. Após a análise dos gráficos gerados com as métricas de desempenho, como vazão, jitter e perda de pacotes, foi possível identificar a diferença entre uma rede de melhor esforço e uma rede com QoS implementada.

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Constant bit rate Video Coding based on SVD video decomposition

2007 IEEE Symposium on Virtual Environments, Human-Computer Interfaces and Measurement Systems ◽

10.1109/vecims.2007.4373939 ◽

2007 ◽

Cited By ~ 1

Author(s):

Cataldo Guaragnella ◽

Tiziano Politi

Keyword(s):

Video Coding ◽

Bit Rate ◽

Constant Bit Rate

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Unidirectional Transport of Constant Bit Rate MPEG-2 Transport Streams on IP Networks

10.5594/smpte.st2022-2.2007 ◽

2007 ◽

Cited By ~ 1

Keyword(s):

Ip Networks ◽

Bit Rate ◽

Constant Bit Rate

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Adaptive Presentation and Scheduling of Media Streams on Parallel Storage Servers

Intelligent User Interfaces ◽

10.4018/978-1-60566-032-5.ch011 ◽

2011 ◽

pp. 233-245

Author(s):

Constantinos Mourlas

Keyword(s):

Bit Rate ◽

Key Factors ◽

Adaptive Software ◽

Adaptive Presentation ◽

Parallel Storage ◽

Constant Bit Rate ◽

Timing Properties ◽

Deterministic Service ◽

Quality Of Presentation

One way to implement adaptive software is to allocate resources dynamically during run-time rather than statically at design time. Design of adaptive software and adaptive execution of processes are key factors that improve versatility of software and decrease maintenance costs. In this chapter we study the development of adaptive software focusing on a design strategy for the implementation of parallel media servers with an adaptable behaviour. This strategy makes the timing properties and the quality of presentation of a set of media streams predictable. The proposed adaptive scheduling approach exploits the performance of parallel environments and seems a promising method that brings the advantages of parallel computation in media servers. The proposed mechanism provides deterministic service for both Constant Bit Rate (CBR) and Variable Bit Rate (VBR) streams. We present an efficient placement strategy for data frames as well as an adaptability strategy that allows appropriate frames to be dropped without sacrificing the ability to present multimedia applications predictably in time.

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