Testbed analysis of video and VoIP transmission performance in IEEE 802.11 b/g networks

摘要

The aim of the work is to analyze capabilities and limitations of different implementations of IEEE 802.11 technologies (IEEE 802.11 b/g), utilized for both video streaming and VoIP calls directed to mobile devices. Our preliminary research showed that results obtained with currently popular simulation tools can be drastically different than these possible in real-world environment, so, in order to correctly evaluate performance of such transfers, a wireless test-bed infrastructure has been created. The results show a strong dependence of the quality of multimedia transmission on the chosen transmission technology and a particular implementation. The overall results demonstrate, that, while multimedia transmission quality in different products is still varied and often requires additional configuration, it is possible to select a WiFi access point model and determine the best system parameters to ensure a good audio/video transfer conditions in terms of acceptable QoP/E (Quality of Perception/Excellence) or MOS (Mean Opinion Score).