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We present a delay analysis of one sender- and two
receiver-initiated classes of reliable multicast protocols. Besides
the average delivery delay we consider the delay to reliably deliver
all packets and the round trip delay. The former two examines the
delay between generation of a packet at the sender and correct
reception at a randomly chosen receiver or all receivers,
respectively. The latter is the delay between generation of a packet
at the sender and reception of all acknowledgment packets at the
sender. Our numerical results show that receiver-initiated protocols
provide significantly better scalability for large receiver groups
and transmission rates compared to the sender-initiated protocol.
However, the delay of the sender-initiated protocol within its
scalability range is substantially lower compared to the
receiver-initiated protocols. To assess the quality of our
analytical model we have compared the analytical results with a
SRM-like protocol simulation. We show that the analytical and
simulation results are strongly correlated, which demonstrates the
appropriateness of our analytical model.
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