A partial ARQ protocol for multicast and broadcast transmissions in network devices operating in a shared medium access network. To support the partial ARQ, a media access control (MAC) protocol uses robustly transmitted frame delimiters and a MAC management frame structure. In a multicast or broadcast...http://www.google.se/patents/US6522650?utm_source=gb-gplus-sharePatent US6522650 - Multicast and broadcast transmission with partial ARQ
