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In a multicast IPTV distribution network, each channel is offered in a different multicast session, and the IP set-top box joins the respective session when the viewer tunes to a new channel. Due to delays associated with network components and encoding schemes, the time difference between the channel-change request and when the new channel shows up on the screen can be annoyingly large. This article examines the Real-Time Transport Protocol (RTP) in IPTV networks and describes how RTP and its control protocol can help reduce channel-change times.
IPTV, multicast video, Real-time Transport Protocol, RTP, retransmission, rapid channel change

A. C. Begen, W. Ver Steeg and N. Glazebrook, "Reducing Channel-Change Times with the Real-Time Transport Protocol," in IEEE Internet Computing, vol. 13, no. , pp. 40-47, 2009.
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