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Tree-shaped broadcasting system, packet transmitting method, node device, and computer-readable medium

  • US 7,924,856 B2
  • Filed: 04/28/2009
  • Issued: 04/12/2011
  • Est. Priority Date: 04/30/2008
  • Status: Expired due to Fees
First Claim
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1. A node device for use in a tree-shaped broadcasting system including a plurality of node devices connected and located in a hierarchy, the node device comprising:

  • a receiver configured to receive a plurality of packets of content data transmitted from a node located at one level higher in the hierarchy or a broadcasting device located at a top of the hierarchy;

    a lost packet detector configured to detect a lost packet from the packets of the content data received by the receiver;

    a packet complement request information transmitter configured to transmit packet complement request information to the node device located at one level higher in the hierarchy, the packet complement request information including a packet complementation request to complement the lost packet; and

    a dummy packet transmitter configured to transmit a dummy packet to a node located at one level lower in the hierarchy instead of the lost packet, the dummy packet including information to delay transmission of the packet complement request information for a predetermined period of hold time.

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