Friedman, Daniel E.Ephremides, AnthonyAutomatic-repeat-request (ARQ) error control is often employed to assure high fidelity information transmission. However, ARQ error control can provide poor throughput for satellite multicasting. The throughput in such communication may be improved by the combination of a terrestrial network parallel to the satellite network and a judiciously modified ARQ protocol. In particular, retransmitted ARQ frames can be sent terrestrially in such a hybrid network, allowing higher throughput than in a pure- satellite network. This work presents analytic results to establish the potential for improving the throughput of satellite multicast communication employing ARQ error control by the adoption of such a hybrid network architecture.en-USerror controlautomatic repeat requestsatellite communicationmulticast communicationhybrid ARQhybrid networksIntelligent Signal ProcessingCommunications SystemsTechnical Report