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Mobile communication system, transmission-side terminal, mobile communication method and processor

  • US 9,532,294 B2
  • Filed: 06/25/2013
  • Issued: 12/27/2016
  • Est. Priority Date: 06/27/2012
  • Status: Active Grant
First Claim
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1. A mobile communication system, comprising:

  • a first radio terminal;

    a second radio terminal; and

    a base station, whereinthe first radio terminal directly transmits user data to the second radio terminal by device to device (D2D) communication,the second radio terminal transmits a first radio signal,the first radio signal indicates whether or not the second radio terminal has received the user data,the base station receives the first radio signal from the second radio terminal,the base station transmits a second radio signal to the first radio terminal in response to a reception of the first radio signal,the second radio signal indicates whether or not the second radio terminal has received the user data,the first radio terminal receives the second radio signal form the base station, andthe first radio terminal determines whether to retransmit the user data to the second radio terminal on a basis of the first radio signal without use of the second radio signal in response to a communication state of the D2D communication exceeding a threshold value.

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