tailieunhanh - Báo cáo hóa học: " Research Article A QoS Architecture for DVB-RCS Next Generation Satellite Networks"

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 A QoS Architecture for DVB-RCS Next Generation Satellite Networks | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2007 Article ID 58484 9 pages doi 2007 58484 Research Article A QoS Architecture for DVB-RCS Next Generation Satellite Networks Thierry Gayraud1 2 and Pascal Berthou1 2 1 Laboratoire d Analyse et d Architecture des Systemes LAAS-CNRS University of Toulouse Cedex4 31077 Toulouse France 2 Toulouse University of Science Toulouse France Received 1 October 2006 Revised 25 January 2007 Accepted 31 May 2007 Recommended by Ray E. Sheriff The standardization of a return channel via satellite DVB-RCS and satellite community efforts in term of interoperability over the last few years leads to quite a positive outcome geostationary satellite networks are intended to provide broadband access to interactive multimedia services in low-infrastructure areas. However in order to take in account real-time multimedia traffic an efficient resource management scheme is still necessary to maximize the scarce uplink capacities usage. To address this capacity issue this paper proposes a complete DVB-RCS QoS architecture that is implemented thanks to an emulation platform and evaluated with real multimedia applications. This paper first gives an overview of the QoS architecture usually used in DVB-S RCS satellite system especially in layers 2 and 3. It then introduces the satellite system emulation used in the experimentation and its calibration. The main contribution of this work focuses on the signaling principle designed to allow applications to take benefit from the QoS features of the satellite system even if they are non-QoS aware. It is then shown how signaling in such QoS architecture allows the user to change dynamically the QoS of his application using QoS agent and QoS server applications even if the application is not QoS-aware. It is also given quantitative results related to such a dynamic QoS change in the experiments done on the satellite emulation system. Copyright 2007 .