Abstract
One of the most interesting and valuable services considered in fixed mobile convergence is video telephony. The success of this conversational video service will depend on the conversational video quality achieved in the multicell wireless indoor scenarios. One of the essential elements in the quality is the effect of the horizontal handovers in the conversational video. This paper analyzes the handover decision based on the probability calculation of handover events in the case of relative signal strength with hysteresis threshold (RSSHT) approach, and it proposes a new handover decision mechanism, variable hysteresis, to avoid unnecessary handovers. The paper presents the impact of the number of handovers and their duration time on the video's effective frame rate. Moreover, the effect of video stream modification during a short handover is also analyzed. Probability and handover duration approaches are combined and a new simple method for video quality evaluation is caused by the handovers in multicell indoor WLAN scenarios. Finally, the model proposed has been applied to a real office scenario.
Highlights
In the current context of fixed-mobile convergence, WLAN technology based on 802.11 is becoming available in common portable and mobile user terminals
Taking the relative signal strength with hysteresis threshold (RSSHT) handover technique with the parameter setting from the previous sections, it is possible to analyze the impact of the handovers in the conversational video quality
The effect of horizontal handover on the conversational video performance in multicell WLAN has been analyzed, and a simple method to predict the impact on the video performance in terms of frame rate has been proposed
Summary
In the current context of fixed-mobile convergence, WLAN technology based on 802.11 is becoming available in common portable and mobile user terminals. IEEE802.11 was originally intended to transport best-effort data traffic, the incorporation of new standards like IEEE802.11e has brought about the opportunity of deploying delay and bandwidth sensitive services, like real-time voice and video communications. In these circumstances, WLANs combined with IP are being used as technology for limited mobility and nomadic services. WLANs combined with IP are being used as technology for limited mobility and nomadic services The success of this scenario will depend on maintaining the communication’s continuity through networks with several wireless access points (APs) by means of horizontal handover. The first dealing with authorization issues between different networks, and the second with increasing speed in the handover between access points
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