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Multicast-based content transmitting system and method, and device and method for estimating high-speed movement

  • US 9,769,511 B2
  • Filed: 05/02/2012
  • Issued: 09/19/2017
  • Est. Priority Date: 07/06/2011
  • Status: Active Grant
First Claim
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1. A multicast-based contents transmission system, comprising:

  • a contents providing apparatus configured tocreate N×

    M multicast stream channels respectively having N different transmission start times and M different transmission rates,provide an N×

    M multicast stream channel list including N×

    M multicast stream channel information including information on contents to be transmitted, a transmission start time and a transmission rate of each channel, andtransmit the contents through a channel among the N×

    M multicast stream channels; and

    a user terminal configured toreceive the N×

    M multicast stream channel list through a network from the contents providing apparatus,confirm an available transmission rate of the network,select a multicast stream channel from the received N×

    M multicast stream channel list according to the confirmed available transmission rate of the network, andreceive the transmitted contents through the selected multicast stream channel,wherein, when a retransmission of the contents is requested, the user terminal is configured toselect a candidate multicast stream channel list by confirming an available transmission rate of the user terminal at the time of the requesting retransmission of the contents with transmission rates of the N×

    M multicast stream channel list, andselect a multicast stream channel for retransmission from the selected candidate multicast stream channel list by comparing a contents retransmission request time with transmission start times of candidate multicast stream channels in the selected candidate multicast channel list,wherein the selected multicast stream channel for retransmission has a transmission start time later than the contents retransmission request time, and closest to the contents retransmission request time among the candidate multicast stream channels,wherein the selected multicast stream channel has a transmission rate lower than the confirmed available transmission rate of the network and highest among candidate multicast stream channels in the received N×

    M multicast stream channel list,wherein the user terminal is configured to store the received contents,wherein, when a number of lost packets of the received contents is equal to or below a reference value, the user terminal is configured to restore contents from the lost packets using a forward error correction method,wherein, when the number of lost packets exceeds the reference value, the user terminal is configured to delete packets of the received contents, and request retransmission of the received contents, andwherein the user terminal is configured to confirm loss of packets in the received contents and restore the lost packets or request retransmission of the received contents when the packets cannot be restored.

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