Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article Energy-Efficient Bandwidth Allocation for Multiuser Scalable Video Streaming over WLAN | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2008 Article ID 219570 14 pages doi 2008 219570 Research Article Energy-Efficient Bandwidth Allocation for Multiuser Scalable Video Streaming over WLAN Xin Ji 1 2 3 Sofie Pollin 1 2 3 4 Gauthier Lafruit 2 Iole Moccagatta 2 Antoine Dejonghe 2 3 and Francky Catthoor1 2 1Katholieke Universiteit Leuven 3000 Leuven Belgium 2IMEC Kapeldreef75 3001 Leuven Belgium 3 Interdisciplinary Institute for Broadband Technology IBBT Ghent University 9000 Gent Belgium 4 UC Berkeley CA 94720 USA Correspondence should be addressed to Xin Ji Received 27 February 2007 Accepted 9 October 2007 Recommended by Peter Schelkens We consider the problem of packet scheduling for the transmission of multiple video streams over a wireless local area network WLAN . A cross-layer optimization framework is proposed to minimize the wireless transceiver energy consumption while meeting the user required visual quality constraints. The framework relies on the IEEE standard and on the embedded bitstream structure of the scalable video coding scheme. It integrates an application-level video quality metric as QoS constraint instead of a communication layer quality metric with energy consumption optimization through link layer scaling and sleeping. Both energy minimization and min-max energy optimization strategies are discussed. Simulation results demonstrate significant energy gains compared to the state-of-the-art approaches. Copyright 2008 Xin Ji et al. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. 1. INTRODUCTION The demand for multimedia transmission over wireless networks exhibits an ever growing trend. As a result the transmission of multiple video streams over a single wireless local area network WLAN is becoming
