Cooperative Reliable Multicast Protocol with local recovery

A Cooperative Reliable Multicast Protocol (CRMP) has been developed to improve real-time data transmission on the Internet Multicast Backbone (MBone) by adding a retransmit server and some repair servers to the multicast session in order to recover lost packets. This paper describes a design and implementation of CRMP with Local recovery (L-CRMP), an extension to the original CRMP. In L-CRMP, each repair server can work as a local server that retransmits packets to other repair servers that do not receive them from the source. Our goal in L-CRMP is to reduce the network overhead caused by retransmission packets while keeping the effective loss rate at the receivers approximately the same.