Effect of Monitor Size on User-Level QoS of Audio-Video Transmission over IP Networks in Ubiquitous Environments
Conference: PIMRC 2005 - 16th Annual IEEE International Symposium on Personal Indoor and Mobile Radio Communications
09/11/2005 - 09/14/2005 at Berlin, Germany
Proceedings: PIMRC 2005
Pages: 7Language: englishTyp: PDFPersonal VDE Members are entitled to a 10% discount on this title
Ito, Yoshihiro; Tasaka, Shuji (Department of Computer Science and Engineering, Graduate School of Engineering, Nagoya Institute of Technology, Nagoya, 466-8555, Japan)
This paper investigates user-level (or perceptual) QoS of audio-video transmission over IP networks with terminals of different size monitors. As the first step of our research, we treat large-sized monitors. By experiment, we assess the user-level QoS for three monitor sizes (80, 60 and 40 inches) and perform QoS mapping. In our experiment, we changed the monitor size by using a projector. The user-level QoS is assessed by the method of successive categories, which is one of the psychometric methods. Moreover, we performed QoS mapping from application-level to user-level with multiple regression analysis. The experimental result indicates that when the degradation of the quality of the audio-video transmission is not noticeable, the user-level QoS of the large monitor size (i.e., 80 inch) becomes the highest. We also observe that when we can notice a low level of degradation of the transmission, the user-level QoS parameter of the large monitor size becomes the smallest. When the degradation is too much, we hardly notice any difference in the user-level QoS between the monitor sizes. We thus confirmed that the monitor size is one of important application-level QoS parameters we must consider.