Research > Faculty Projects

Cross-Layer QoS Control of Wireless Video

Principal Investigator
Jenq-Neng Hwang

Sponsor(s)
Siemens Research, Princeton

Award Period
02/28/2007 - 12/31/2009

Abstract
We propose a distributed cross-layer congestion control algorithm that provides enhanced 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. In order to remedy these issues, it is preferred to apply airtime fairness with a cross-layer approach. The idea is to use a fast frame-by-frame control loop in the CSMA/CA based MAC layer while simultaneously exploiting the powerful control loop gain attainable by performing source- rate adaptation in the APP layer. The proposed algorithm will be supported through both simulation and experimentation with various channel and PHY rate scenarios.

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