Analysis of delay and delay jitter of voice traffic in the internet

Authors:
Mansour J. Karam;Fouad A. Tobagi
Affiliations:
Speedtrak Communications, San Mateo, CA and Computer Systems Laboratory, Department of Electrical Engineering, Stanford University, Stanford, CA;Computer Systems Laboratory, Department of Electrical Engineering, Stanford University, Stanford, CA
Venue:
Computer Networks: The International Journal of Computer and Telecommunications Networking
Year:
2002

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Abstract

In the future, voice communication is expected to migrate from the public switched telephone network to the Internet. Because of the particular characteristics (low volume and burstiness) and stringent delay and loss requirements of voice traffic, it is important to separate voice traffic from other traffic in the network by providing it with a separate queue. In this study, we conduct a thorough assessment of voice delay in this context. We conclude that priority queuing is the most appropriate scheduling scheme for the handling of voice traffic, while preemption of nonvoice packets is strongly recommended for sub-10 Mbit/s links. We also find that per-connection custom packetization is in most cases futile, i.e. one packet size allows a good compromise between an adequate end-to-end delay and an efficient bandwidth utilization for voice traffic.