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Systems and Methods for User Equipment Synchronization

  • US 20160044620A1
  • Filed: 08/06/2015
  • Published: 02/11/2016
  • Est. Priority Date: 08/07/2014
  • Status: Active Grant
First Claim
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1. A method in an in-coverage (IC) user equipment (UE) for the IC UE to become a synchronization source for out-of-coverage UEs for device-to-device (D2D) communication, the method comprising:

  • obtaining, by the IC UE, scanning parameters;

    scanning, by the IC UE, for out-of-coverage synchronization signals;

    transmitting, by the IC UE, a measurement report to a Transmission Point (TP) in response to a report trigger, the measurement report comprising information of one or more received out-of-coverage synchronization signals;

    receiving, by the IC UE, a configuration command from the TP instructing the IC UE to become a synchronization source; and

    transmitting, by the IC UE, a D2D synchronization signal (SS) for a duration of time or until instructed not to do so by the TP.

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