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An increasing number of streaming applications need packets to be strictlyin-order at the receiver. This paper provides a framework for analyzingin-order packet delivery in such applications. We consider the problem ofmulticasting an ordered stream of packets to two users over independent erasurechannels with instantaneous feedback to the source. Depending upon the channelerasures, a packet which is in-order for one user, may be redundant for theother. Thus there is an inter-dependence between throughput and the smoothnessof in-order packet delivery to the two users. We use a Markov chain model ofpacket decoding to analyze these throughput-smoothness trade-offs of the users,and propose coding schemes that can span different points on each trade-off.

Throughput-Smoothness Trade-offs in Multicasting of an Ordered Packet Stream