QoS in real time data transmission



The increasing demand for reliable and available network services is becoming a concern. A costumer will choose an Internet Service Provider (ISP) based on the decisive criteria of the available services and enabled functionalities, i.e., based upon the QoS provided.. QoS can be regarded as the ability of an application to obtain the network service it requires for a successful operation. QoS is particularly critical for applications with real time requirements, such as applications involving tele-conference. Under these circumstances, the selection of an appropriate transport protocol exhibits a significant impact on the QoS perceived by the user. In this work, is presented an overview of some existent QoS models and of some transport layer protocols. Furthermore, performance tests over different networks using RTP are introduced. In order to define the 'overhead� that RTP presents when transmitting multimedia data, comparative tests using UDP packets are also presented.


QoS, Transport Protocols



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8ª Conferência sobre Redes de Computadores, CRC 2005, September 2005

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