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This paper introduces a reliable multicast transport protocol RCCMP (Reliable CongestionControlled Multicast Protocol) that has been designed to be simple, scalable, reliable and TCPfriendly. The congestion control is a central part of the protocol, where the feedback of the worst receiver is used to control a transmission window in a TCP-like fashion. The scalability issue is addressed with an exponential timers scheme, that is also used to estimate the number of receivers involved in the communication. The protocol neither needs support from network elements nor maintains state information dependent of the number of receivers. The paper presents a number of simulation results on its performance. Besides, some design choices are evaluated.

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