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User terminal and base station for a device to device proximity service

  • US 9,942,743 B2
  • Filed: 11/17/2016
  • Issued: 04/10/2018
  • Est. Priority Date: 05/09/2014
  • Status: Active Grant
First Claim
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1. A user terminal located inside the coverage area of a first cell, the first cell operating at a first frequency in a mobile communication system that supports a D2D (Device to Device) proximity service, the user terminal comprising:

  • a processor configured totransmit a D2D interest indication to a base station operating in the first cell, the D2D interest indication including information indicating a second frequency in which the user terminal has an interest in the D2D proximity service, wherein the transmission of the D2D interest indication enables the base station to determine one of the first cell and a second cell where the user terminal will operate to obtain the D2D proximity service, wherein the D2D proximity service includes a D2D discovery signal step for discovering other user terminals located in one of the first cell operating at the first frequency and the second cell operating at the second frequency; and

    transmit a D2D discovery signal of the D2D discovery signal step to another user terminal in one of the first cell and the second cell where D2D resources are available.

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