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Mobile communication system having radio terminal(s) that communicate directly with other radio terminal(s)

  • US 10,070,363 B2
  • Filed: 09/25/2013
  • Issued: 09/04/2018
  • Est. Priority Date: 09/27/2012
  • Status: Active Grant
First Claim
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1. A mobile communication method, comprising:

  • performing, by a first radio terminal, a relay between a second radio terminal and a radio base station by direct device to device (D2D) communication;

    transmitting, from the second radio terminal to the first radio terminal, a first message for requesting a release of a connection of the D2D communication between the first radio terminal and the second radio terminal; and

    transmitting, from the first radio terminal to a network apparatus being a Mobility Management Entity (MME), a second message for notifying that the connection between the first radio terminal and the second user terminal has been released, after the first radio terminal receives the first message.

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