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Switching mode of operation in D2D communications

  • US 9,848,454 B2
  • Filed: 01/16/2015
  • Issued: 12/19/2017
  • Est. Priority Date: 01/28/2014
  • Status: Active Grant
First Claim
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1. A method of device to device (D2D) wireless communication at a user equipment (UE), comprising:

  • receiving a connection response message from a base station comprising one or more mode switching parameters, the one or more switching parameters relating to an indication of an imminent radio link failure (RLF) with the base station;

    establishing communications with one or more other UEs according to a first D2D mode, the first D2D mode based at least in part on a centralized transmission resource schedule received from the base station;

    determining that the one or more mode switching parameters have been satisfied;

    switching to a second D2D mode before the RLF occurs, the second D2D mode based at least in part on a distributed transmission scheduling using a first indication of a pool of resources allocated by the base station;

    monitoring communications from the base station for a second indication of the pool of resources;

    determining that a message from the base station indicating the pool of resources is not available; and

    switching to a third D2D mode, the third D2D mode based at least in part on a distributed transmission utilizing a preconfigured resource pool.

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