This paper considers the reliable transmission for wireless multicast networks where multiple sources want to distribute\r\ninformation to a set of destinations with assistance of a relay. Basically, the reliability of a communication link is assured via\r\nautomatic repeat request (ARQ) protocols. In the context of multisource multicast networks, the challenge is how to retransmit\r\nthe lost or erroneous packets efficiently. In traditional approaches, the retransmission of lost packets from a single source is\r\ntreated separately, and thus it may cause a considerable delay. To solve this problem, we propose the relay detects, combines,\r\nand forwards the packets which are lost at destinations using network coding. In the proposed ARQ protocol, the relay detects\r\npackets from different sources and combines the lost packets using NC. In particular, two packet-combination algorithms are\r\ndeveloped to guarantee that all lost packets are retransmitted with the smallest number of retransmissions. Furthermore, we\r\nanalyze the transmission bandwidth and provide the numerical results to demonstrate the superior performance of the proposed\r\nARQ protocol over some existing schemes.
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