Learn More
—We study the application of Unequal Loss Protection (ULP) algorithms to motion-compensated video over lossy packet networks. In particular, we focus on streaming video applications over the Internet. The original ULP framework [14] applies unequal amounts of forward error correction (FEC) to embedded data to provide graceful degradation of quality in the(More)
We study the problem of multicast key distribution for group security. Secure group communication systems typically rely on a group key, which is a secret shared among the members of the group. This key is used to provide privacy by encrypting all group communications. Because groups can be large and highly dynamic, it becomes necessary to change the group(More)
We address the problem of designing efficient solutions for media-on-demand in systems that use stream merging. In a stream merging system, the receiving bandwidth of clients is larger than the playback bandwidth and clients can buffer parts of the transmission to be played back later. Intelligent use of these resources allows bandwidth usage to be reduced(More)
— We consider live continuous broadcast (such as radio or TV) to which users can join with time-shifting. They can join the broadcast at time t and receive the broadcast of time t − w for some offset parameter w ≥ 0. The simplest implementation that supports such a feature allocates a dedicated channel for each arrival time t and offset value w. Using such(More)
It is natural to consider extending our proof techniques to clients with different degrees of adaptivity !. The major difficulty in extending our techniques to a wider range of values for ! lies in the expressions that arise when computing the value of the expected waiting time. For smaller values of !, these expressions do not differ significantly from(More)
  • 1