Multimedia streams achieved unexpected penetration over wireless networks during the last few years. Provisioning of 3D video stream-based applications and 3D movies transferring – which are becoming significant contents of wireless network traffic – is a big challenge for Internet Service Providers (ISP). Very little empirical results are known about the user perceived quality of these kinds of services. In this paper, we attempt to tackle this challenge by carrying out a real network scenario where 3D multimedia streams are provided through a GPON-based transport network and customers’ IEEE802.11n standard based Wi-Fi access is available for video delivery. 20 test cases were distinguished by video samples suffering various Quality of Service (QoS) degradations, Wi-Fi TX-Power changing and alteration between secure and not secure data transport. 90 human subjects took part in this investigation who evaluated perceived visual quality by Mean Opinion Score (MOS). QoE were also influenced by other factors like channel interference in Wi-Fi network, acceptance of 3D technology, and personal prior technical knowledge and experience of participants (Level of Comprehension, LoC). The goal was to investigate relationships between combinations of the previously mentioned service parameters and their effects on perceived quality. It was also examined how the available environmental information during measurement scenarios affected evaluator behavior.
Kulik Ivett, tanszéki mérnök, BME távközlési és Médiainformatikai Tanszék
2013. július 19.