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System and method for fast start-up of live multicast streams transmitted over a packet network

  • US 7,870,590 B2
  • Filed: 10/20/2004
  • Issued: 01/11/2011
  • Est. Priority Date: 10/20/2004
  • Status: Active Grant
First Claim
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1. A system for multicast streaming of programs over a packet network comprising:

  • a multicast server having a processor that conditions a multicast video bitstream such that packets containing an I-frame are located near program specific information (PSI) packets, the PSI packets include conditional access table (CAT), program association table (PAT), and program map table (PMT) data, the processor marking a random join point (RJP) in the multicast video bitstream immediately preceding the I-frame and the PSI packets, the node outputting the conditioned and marked video bitstream across the packet network; and

    an edge router or switch device of the network that receives the conditioned and marked video bitstream, the edge device including a buffer that caches packets of the conditioned and marked multicast video bitstream starting at the RJP, the edge device sending the cached packets to a client receiver in a multicast group in response to a request received by the edge device from the client receiver.

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