Date Added: Apr 2011
Time-shifted streaming (or catch-up TV) allows viewers to watch their TV programs within an expanded time window. In this paper, the authors emphasize the challenging characteristics of time-shifted TV systems that prevent known delivery systems to be used. They model time-shifted TV as multiple-interval graph, then they present a Peer-Assisted Catch-Up Streaming system, namely PACUS, where a set of end users' computers assists the server for the content delivery. They show in particular how the PACUS tracker server can be efficiently implemented for catch-up TV. They explain the benefits of PACUS by simulations.