Attributes unmasked: Investigation of service aspects in subjective evaluation of wireless 3D multimedia

Multimedia services achieved unexpected penetration over wireless networks during the last few years. Provisioning of 3D video stream-based applications and transferring 3D movies - also becoming significant within the wireless domain - is a big challenge for Internet Service Providers (ISP). Only scarce empirical results are known about the user perceived quality of such kind 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 an IEEE 802.11n standard based Wi-Fi access is available for video delivery at the customer side. 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 participants took part in this investigation, who evaluated perceived visual quality by Mean Opinion Score (MOS). QoE was also influenced by other factors like channel interference in the Wi-Fi network, acceptance of 3D technology, and personal prior technical knowledge/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.