As intelligent content management reduces the latency between IPTV video serving office and mobile device, it becomes feasible to introduce a limited form of negative acknowledgments. Scalable video lends itself to selective acknowledgment, as does selection by video picture type. The defining characteristic of mobile video transport schemes is the response to handover. In this paper, it is demonstrated that the scalable selective negative acknowledgment transport scheme proposed decreases throughput but can retain acceptable video quality during vertical handover from an outdoors WiMAX system and an indoors IEEE 802.11 system.
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