University of Twente Student Theses


Fast retransmission for multicast IPTV

Prins, Martin (2007) Fast retransmission for multicast IPTV.

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Abstract:In a IPTV distribution network, broadcast television channels are distributed using multicast stream delivery. Packet loss occuring during transport will impair the displayed video signal and thus reduces the Quality of Experience. Due to the nature of video compression techniques a single lost packet can lead to visual impairments lasting for multiple seconds, so packet loss should be kept to a minimum. Two well known error recovery techniques are packet retransmission and Forward Error Correction (FEC). In a large multicast distribution network an end-to-end packet retransmission mechanism is not feasible as feedback implosion will occur when receivers notify the source about what packets they need retransmission of. A FEC mechanism allows the IPTV stream receivers to recover a certain amount of data, but when loss rates vary for different users there will either be some users with remaining losses or bandwidth will be wasted in large parts of the network where the loss rate is low. Another solution is to use local loss recovery for smaller parts of the multicast distribution tree. By introducing a fastretransmission function in the access network, losses can be recovered rapidly and the video quality for the users can be maintained.
Item Type:Essay (Master)
Faculty:EEMCS: Electrical Engineering, Mathematics and Computer Science
Subject:54 computer science
Programme:Computer Science MSc (60300)
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