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Data communication system, data transmission apparatus, data reception apparatus, data communication method, and computer program

  • US 20030120802A1
  • Filed: 12/04/2002
  • Published: 06/26/2003
  • Est. Priority Date: 12/04/2001
  • Status: Active Grant
First Claim
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1. A data communication system for transferring streaming data, comprising:

  • a data transmission apparatus including a packet transmission processing unit for transmitting a plurality of data packets containing transmission data, and a retransmission control unit for extracting at least one data packet to be retransmitted according to a retransmission-request message packet received from said data reception apparatus; and

    a data reception apparatus including a packet reception processing unit for receiving the plurality of data packets transmitted from said data transmission apparatus, and a retransmission-request processing control unit for determining whether to transmit a retransmission-request message packet that serves as a data-packet retransmission request to said data transmission apparatus, based on detection of at least one of a lost packet and an error in the plurality of data packets transmitted from said data transmission apparatus, wherein said retransmission-request processing control unit determines whether one or more retransmission data packets associated with the retransmission request can be received in time for processing relating to playing of data contained in the one or more retransmission data packets, and determines whether to transmit the retransmission request on condition that the one or more retransmission data packets can be received in time.

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