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.
Highlights
A large number of technological changes are today impacting on communication networks which are encouraging the introduction of new end-user services
Conversational video over wireless LAN dimensioning has been addressed under the optimal network throughput and the perspective of video quality
The paper proposes a simple and new dimensioning model that incorporates both key aspects of throughput and quality
Summary
A large number of technological changes are today impacting on communication networks which are encouraging the introduction of new end-user services. New convergent services are becoming possible, thanks to the expansion of IPbased networks, 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 These services are ranging from the pure voice, based on unlicensed mobile access (UMA) or voice call continuity (VCC) standards, to multimedia including mobile TV and conversational video communications. The following sections introduce the framework for conversational video applications, a new and simple model of conversational video over wireless LAN dimensioning, and show that different results are achieved using throughput and video quality approaches. Both discrepant results could be conciliated for proper network dimensioning, as it is shown in a real-office scenario
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