tailieunhanh - Báo cáo hóa học: " Research Article Dimensioning Method for Conversational Video Applications in Wireless Convergent 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 Dimensioning Method for Conversational Video Applications in Wireless Convergent Networks | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2008 Article ID 328089 14 pages doi 2008 328089 Research Article Dimensioning Method for Conversational Video Applications in Wireless Convergent Networks Alfonso Fernandez-Duran 1 Raquel Perez Leal 1 and Josts I. Alonso2 1 Alcatel-Lucent Spain Ramirez de Prado 5 28045 Madrid Spain 2Escuela Tecnica Superior de Ingenieros de Telecomunicación Universidad Politecnica de Madrid Ciudad Universitaria 28040 Madrid Spain Correspondence should be addressed to Alfonso Fernandez-Duran afd@ Received 1 March 2007 Revised 19 June 2007 Accepted 22 October 2007 Recommended by Kameswara Rao Namuduri New convergent services are becoming possible thanks to the expansion of IP networks based on the availability of innovative advanced coding formats such as which reduce network bandwidth requirements providing good video quality and the rapid growth in the supply of dual-mode WiFi cellular terminals. This paper provides first a comprehensive subject overview as several technologies are involved such as medium access protocol in advanced video coding standards and conversational application characterization and recommendations. Second the paper presents a new and simple dimensioning model of conversational video over wireless LAN. WLAN is addressed under the optimal network throughput and the perspective of video quality. The maximum number of simultaneous users resulting from throughput is limited by the collisions taking place in the shared medium with the statistical contention protocol. The video quality is conditioned by the packet loss in the contention protocol. Both approaches are analyzed within the scope of the advanced video codecs used in conversational video over IP to conclude that conversational video dimensioning based on network throughput is not enough to ensure a satisfactory user experience and video quality has to be taken also

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