On transport layer mechanisms for real-time QoS

Authors:
Panagiotis Papadimitriou;Vassilis Tsaoussidis
Affiliations:
Demokritos University of Thrace, Electrical & Computer Engineering Department, Xanthi, Greece;Demokritos University of Thrace, Electrical & Computer Engineering Department, Xanthi, Greece
Venue:
Journal of Mobile Multimedia
Year:
2005

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Abstract

We study transport protocol performance from the perspective of real-time applications. More precisely, we evaluate TCP and UDP supportive role in terms of real-time QoS, network stability and fairness. A new metric for the evaluation of real-time application performance is proposed to capture both bandwidth and delay requirements. Using this metric as a primary criterion in our evaluation analysis, we reach several conclusions on the specific impact of wireless links, real-time traffic friendliness, and UDP/TCP protocol efficiency. Beyond that, we also reach an unexpected result: UDP traffic has occasionally negative impact compared with TCP traffic not only for the systemwide behavior, but also for the supporting application as well.