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Communication control method, user terminal, and processor

  • US 10,251,126 B2
  • Filed: 11/25/2014
  • Issued: 04/02/2019
  • Est. Priority Date: 11/26/2013
  • Status: Active Grant
First Claim
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1. A communication control method used in a mobile communication system that supports a D2D proximity service, comprising:

  • performing, by a base station, energy saving that reduces transmission power of a radio signal, the base station managing a cell in which a user terminal, whose movement is restricted, exists;

    receiving, by the user terminal, the radio signal from the base station performing the energy saving;

    determining, by the user terminal, whether the base station is performing the energy saving, based on reduced transmission power of the received radio signal, the determining comprising determining that the base station is performing the energy saving in response to detection of the reduced transmission power of the received radio signal;

    switching, by the user terminal, an operation mode from a normal mode, in which the user terminal performs its normal operation, to a power saving mode, in which the user terminal reduces power consumption of an operation in the D2D proximity service to be less than power consumption of the operation in the D2D proximity service in the normal mode, when the user terminal determines that the base station is performing the energy saving;

    prior to the performing the energy saving, setting, by the user terminal, the base station transmitting the radio signal whose received power becomes maximum in a predetermined time period as a designated base station, whereinin the switching, when the base station set as the designated base station performs the energy saving, the user terminal switches the operation mode from the normal mode to the power saving mode, andthe communication control method further comprises;

    maintaining, by the user terminal, the base station as the designated base station even when the received power of the radio signal from the base station is no longer the maximum received power, whereinthe operation in the D2D proximity service is at least one of a discovery operation for discovering a partner terminal in D2D communication or for being discovered by the partner terminal, and a transmission operation of a synchronization signal for establishing terminal-to-terminal synchronization.

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