Open Access

Dimensioning Method for Conversational Video Applications in Wireless Convergent Networks

  • Alfonso Fernandez-Duran1Email author,
  • Raquel Perez Leal1 and
  • José I. Alonso2
EURASIP Journal on Wireless Communications and Networking20072008:328089

DOI: 10.1155/2008/328089

Received: 1 March 2007

Accepted: 22 October 2007

Published: 1 November 2007

Abstract

New convergent services are becoming possible, thanks to the expansion of IP networks based on the availability of innovative advanced coding formats such as H.264, 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 IEEE802.11, H.264 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 into account. Finally, the proposed model has been applied to a real-office scenario.

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Authors’ Affiliations

(1)
Alcatel-Lucent Spain
(2)
Escuela Tecnica Superior de Ingenieros de Telecomunicación, Universidad Politécnica de Madrid, Ciudad Universitaria

Copyright

© Alfonso Fernandez-Duran et al. 2008

This article is published under license to BioMed Central Ltd. 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.