BANDWIDTH ESTIMATION AND ROBUST VIDEO STREAMING OVER 802.11E WIRELESS LANS (FriPmOR4)

Author(s) : Mehmet Demircin (Georgia Institute of Technology, United States of America) Peter van Beek (Sharp Laboratories of America, United States of America)

Abstract : Streaming high quality audio/video (AV) from a home gateway to TV sets over a wireless local area network (WLAN) is a challenging problem due to fluctuating bandwidth caused by interference. Our approach is to adjust the video bit rate dynamically in order to improve the experienced audiovisual quality. The effectiveness of rate adaptation depends on the accurate and timely estimation of the available bandwidth. In this paper we specifically focus on robust video streaming with IEEE 802.11e medium access control (MAC) enhancements for quality-of-service (QoS). These enhancements to 802.11e increase the WLAN throughput and decrease packet latencies. However, bandwidth estimation methods used in prior work, based on packet dispersion measurements, can not be used in this context. We propose a new application-layer bandwidth measurement method that runs at the sender application, and uses the differences of packet send times and feedback receive times. We have implemented our bandwidth estimation technique in a video streaming simulation environment that also includes a delay-constrained rate adaptation algorithm at the sender. In our experiments, streaming with bandwidth estimation and rate adaptation achieved a PSNR gain up to 3.3 dB compared to streaming without rate adaptation.

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