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Methods and apparatus for synchronization to, and measurements on, unlicensed frequency carriers

  • US 10,581,547 B2
  • Filed: 09/28/2015
  • Issued: 03/03/2020
  • Est. Priority Date: 09/26/2014
  • Status: Active Grant
First Claim
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1. A method of operating a user equipment (UE) with a secondary cell (Scell) operating on an unlicensed carrier, the method comprising at the UE:

  • determining, from an unlicensed spectrum measurement instance configuration message, one or more measurement instances where a discovery signal is scheduled to be transmitted on the S cell;

    monitoring a primary cell (Pcell) operating in licensed spectrum for an unlicensed spectrum control channel message transmitted in the licensed spectrum and associated with the discovery signal, the unlicensed spectrum control channel message confirming whether the discovery signal is expected to be transmitted during at least one of the one or more measurement instances on the Scell as determined from the unlicensed spectrum measurement instance configuration message;

    determining, based on the unlicensed spectrum control channel message, whether the discovery signal is expected to be transmitted during at least one of the one or more measurement instances on the Scell, the determining comprising unsuccessfully decoding the unlicensed spectrum control channel message to determine that the discovery signal is expected to be transmitted during at least one of the one or more measurement instances on the Scell;

    based on the determining whether the discovery signal is expected to be transmitted during at least one of the one or more measurement instances on the Scell, detecting the discovery signal transmission on the Scell during the at least one of the one or more measurement instances on the Scell;

    performing a first measurement on the discovery signal during at least one measurement instance of the one or more measurement instances; and

    reporting a measurement value based on at least the first measurement.

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