Architectural considerations for a new generation of protocols
SIGCOMM '90 Proceedings of the ACM symposium on Communications architectures & protocols
Multimedia: computing, communications and applications
Multimedia: computing, communications and applications
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High-speed networks: TCP/IP and ATM design principles
High-speed networks: TCP/IP and ATM design principles
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Proceedings of the ACM SIGCOMM '98 conference on Applications, technologies, architectures, and protocols for computer communication
Quality of service in networked multimedia systems
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Provisioning of real-time video communication services with sufficiently high quality is getting increasingly important in nowadays computer networks. This task is particularly challenging in the case of the presently typical communication networks which offer their data transport services in a best effort manner, i.e. without any guarantees regarding service quality. This paper classifies the principal techniques for quality improvement in video communications, which can be embedded in a communication network or in dedicated, network-external middleware components. With these techniques we distinguish, on one hand, mechanisms achieving quality improvement by means of local decisions within the sending or receiving endsystem and, on the other hand, mechanisms requiring communication and cooperation between middleware components on both, sending and receiving side. We also emphasize the combined usage of different techniques for quality-of-service (QoS) improvement. In order to judge the current service quality on different layers within the protocol hierarchy we introduce a set of QoS measures for each of the basic service interfaces identified. Finally, we solve the mapping problems between these QoS measures by way of example.