Congestion control and its stability in networks with delay sensitive traffic

Authors:
Ying Li;Antonis Papachristodoulou;Mung Chiang;A. Robert Calderbank
Affiliations:
Department of Electrical Engineering, Princeton University, Princeton, NJ 08544, United States;Department of Engineering Science, University of Oxford, Oxford OX1 3PJ, United Kingdom;Department of Electrical Engineering, Princeton University, Princeton, NJ 08544, United States;Department of Electrical Engineering, Princeton University, Princeton, NJ 08544, United States
Venue:
Computer Networks: The International Journal of Computer and Telecommunications Networking
Year:
2011

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Abstract

We consider congestion control in a network with delay sensitive/insensitive traffic, modelled by adding explicit delay terms to the utility function measuring user's happiness on the Quality of Service (QoS). A new Network Utility Maximization (NUM) problem is formulated and solved in a decentralized way via appropriate algorithms implemented at the users (primal) and/or links (dual). For the dual algorithm, delay-independent and delay-dependent stability conditions are derived when propagation delays are taken into account. A system with voice and data traffic is considered as example and the properties of the congestion control algorithm are assessed.