Multicast with proactive forward error correction
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United States of America Patent
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Aug 21, 2001
Grant Date -
N/A
app pub date -
Mar 23, 1998
filing date -
Mar 23, 1998
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
Apparatus and methods for multicasting blocks of data to a plurality of receivers, the blocks including a first block and a second block, the first block comprising k.sub.1.gtoreq.1 data packets, the transmission of the first block comprising an initial transmission of the k.sub.1 data packets and h.sub.1.gtoreq.repair packets and one or more subsequent transmissions of additional repair packets in response to repair requests, wherein any k.sub.1 of the data packets and repair packets provide sufficient information to recover the k.sub.1 data packets; and multicasting a second block comprising k.sub.2.gtoreq.1 data packets, the transmission of the second block comprising an initial transmission of the k.sub.2 data packets and h.sub.2.gtoreq.repair packets, wherein any k.sub.2 of the data packets and the repair packets of the second block provide sufficient information to recover the k.sub.2 data packets of the second block and either or both k.sub.2 and h.sub.2 differ from k.sub.1 and h.sub.1, respectively. The invention provides multicast data transmission with adaptive proactive forward error correction (FEC) in combination with automatic repair requesting (ARQ), and reduces response feedback implosion in multicast over digital packet networks.
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