2009 Sixth International Conference on Broadband Communications, Networks, and Systems. Broadnets 2009 (2009)
Sept. 14, 2009 to Sept. 16, 2009
Kandaraj Piamrat , INRIA Rennes-Bretagne Atlantique, Campus Beaulieu 35042, France
Adlen Ksentini , IRISA/University of Rennes I, Campus Beaulieu 35042, France
Jean-Marie Bonnin , Institut Telecom/Telecom Bretagne, CS-17607, 35576 Cesson-Sévigné, France
Cesar Viho , IRISA/University of Rennes I, Campus Beaulieu 35042, France
Nowadays, wireless networks have been deploying everywhere, with IEEE 802.11 as the most popular standard. However, wireless resources are scarce and wireless condition varies often. These limitations are crucial for applications with tight QoS requirements such as video or voice over IP. To cope with the problems, the standard has provided many features including multi-rate capability, which is the focus of this paper. Multi-rate capability is beneficial especially for multicast transmission, in which the traffic sent by default at basic rate may result in capacity wasting because of longer channel occupancy. Moreover the lack of feedback mechanism makes it difficult to deal with reliability or service quality. Some protocols have proposed to use rate adaptation to handle the problems but none of them takes into account quality of experience (QoE), which is an essential quality indicator in multimedia traffic, for making decision. Therefore, we propose in this paper a novel rate-adaptation mechanism based on quality of experience. We make use of PSQA (Pseudo-Subjective Quality Assessment) tool for obtaining mean opinion score in real-time. Our objective is to improve bandwidth utilization while satisfying user experience. We illustrate significant performance improvement obtained by our scheme according to this goal.
multimedia communication, protocols, quality of service, telecommunication traffic, wireless LAN
K. Piamrat, A. Ksentini, J. Bonnin and C. Viho, "Rate adaptation mechanism for multimedia multicasting in wireless networks," 2009 Sixth International Conference on Broadband Communications, Networks, and Systems. Broadnets 2009(BROADNETS), Madrid, 2009, pp. 1-7.