tailieunhanh - Báo cáo hóa học: "Research Article W-NINE: A Two-Stage Emulation Platform for Mobile and Wireless Systems"

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 W-NINE: A Two-Stage Emulation Platform for Mobile and Wireless Systems | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2010 Article ID 149075 20 pages doi 2010 149075 Research Article W-NINE A Two-Stage Emulation Platform for Mobile and Wireless Systems Emmanuel Conchon 1 Tanguy Perennou 2 3 Johan Garcia 4 and Michel Diaz2 3 1 Universite de Toulouse IRIT IRT-Champollion ISIS-ISAE 81100 Castres France 2 CNRS LAAS 7 Avenue du colonel Roche 31077 Toulouse France 3 Universite de Toulouse UPS INSA INP ISAE LAAS 31077 Toulouse France 4 Department of Computer Science University of Karlstad SE-651 88 Karlstad Sweden Correspondence should be addressed to Emmanuel Conchon Received 31 May 2009 Accepted 9 November 2009 Academic Editor Nikos Passas Copyright 2010 Emmanuel Conchon 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. More and more applications and protocols are now running on wireless networks. Testing the implementation of such applications and protocols is a real challenge as the position of the mobile terminals and environmental effects strongly affect the overall performance. Network emulation is often perceived as a good trade-off between experiments on operational wireless networks and discrete-event simulations on Opnet or ns-2. However ensuring repeatability and realism in network emulation while taking into account mobility in a wireless environment is very difficult. This paper proposes a network emulation platform called W-NINE based on off-line computations preceding online pattern-based traffic shaping. The underlying concepts of repeatability dynamicity accuracy and realism are defined in the emulation context. Two different simple case studies illustrate the validity of our approach with respect to these concepts. 1. Introduction Testing and evaluating a transport protocol or