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System and methods for controlling out-of-network D2D communications

  • US 10,178,701 B2
  • Filed: 08/11/2017
  • Issued: 01/08/2019
  • Est. Priority Date: 05/10/2013
  • Status: Active Grant
First Claim
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1. A method for selecting a synchronization master for device-to-device (D2D) communication, the method comprising:

  • receiving, by a first user equipment (UE), a discovery signal from a second UE, the discovery signal comprising a synchronization signal indicating whether the second UE is synchronized with a base station and an in-coverage bit/flag indicating whether the second UE is an in-coverage UE or an out-of-coverage UE of the base station; and

    participating, by the first UE, in a D2D communication session with the second UE over a predefined uplink carrier as either a timing slave entity or a timing master entity based on the synchronization signal and the in-coverage bit/flag.

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