Enhanced Video Streaming over IEEE 802.11e Experimental Testbed
Date Issued
2009
Date
2009
Author(s)
Huang, Yin-Cheng
Abstract
In recent years, wireless communication are rapidly developed. IEEE 802.11 based WLAN is one of the most popular networks. More users use wireless network to access multimedia contents from internet. That is to say, the traffic in the air include traditional data packets and multimedia packets. Therefore, an extension of IEEE 802.11 standard called 802.11e is developed to provide QoS support for different types of traffic. In this thesis paper, we implement a cross-layer architecture to enhance the QoS transmission of H.264/AVC video stream in IEEE 802.11e wireless environment. We integrate Cross-layer Adaptive Video Prioritization (CAVP) and SoftQoS. CAVP provides Application layer Video Frame Prioritization (VFP), which prioritizes packet according to PSNR influence level, and MAC-layer Adaptive Prioritization (MAP), which estimates the delay time of each access category (AC) and chooses the better one. SoftQoS, on the other hand, controls contention window (CW) size to improve the successful transmission rate of important information. We also shows the results of the experiments on real testbed. Our cross-layer architecture has better performance than the works before, especially when the channel is congested.
Subjects
802.11
802.11e
Wi-Fi
testbed
video streaming
wireless
Type
thesis
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