Airtime fair distributed cross-layer congestion control for real-time video over WLAN

Authors:
Chih-Wei Huang;Michael Loiacono;Justinian Rosca;Jenq-Neng Hwang
Affiliations:
Department of Electrical Engineering, University of Washington, Seattle, WA;Real-Time Vision and Modeling Department, Siemens Corporate Research, Princeton, NJ and Department of Electrical and Computer Engineering, Rutgers University, Piscataway, NJ;Real-Time Vision and Modeling Department, Siemens Corporate Research, Princeton, NJ;Department of Electrical Engineering, University of Washington, Seattle, WA
Venue:
IEEE Transactions on Circuits and Systems for Video Technology
Year:
2009

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Abstract

We propose a distributed cross-layer congestion control algorithm that provides enhanced quality of service QoS and reliable operation for real-time uplink video over WiFi applications. Such applications are characterized by many wireless devices transmitting video at various PHY rates over a relatively congested channel. Unfortunately, today's off-the-shelf 802.11 equipment can be easily demonstrated to suffer catastrophic failure when subject to these conditions--let alone provide acceptable perceptual quality to the user. We show that in order to remedy these issues, it is preferable to apply airtime fairness with a cross-layer approach. The idea is to use a fast frame-by-frame control loop in the carrier sense multiple access/collision avoidance (CSMAlCA)-based medium access control (MAC) layer while simultaneously exploiting the powerful control loop gain attainable by performing source-rate adaptation in the application layer. We support the proposed algorithm through both simulation and experimentation with various channel and PHY rate scenarios.