System and method for sharing a control channel for carrier aggregation

  • US 11,089,580 B2
  • Filed: 08/11/2017
  • Issued: 08/10/2021
  • Est. Priority Date: 04/30/2010
  • Status: Active Grant
First Claim
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1. A method for processing a control channel at user equipment (UE) in a multi-carrier communication system, the method comprising:

  • receiving, on a first carrier, an activation signal specifying a second carrier among a plurality of carriers;

    activating the second carrier based on the activation signal;

    determining a plurality of control channel element (CCE) subset candidates corresponding to the first carrier and the second carrier, wherein;

    the plurality of CCE subset candidates are on the first carrier, andlocations of CCEs in the plurality of CCE subset candidates corresponding to the first and second carriers at a plurality of aggregation levels are each determined by a pseudorandom number;

    determining whether one of the CCE subset candidates at one of the aggregation levels corresponds to only one of the first and second carriers; and

    responsive to a determination that the one of the CCE subset candidates does not correspond to only one of the first and second carriers;

    identifying a carrier indicator field (CIF) in downlink control information (DCI) in the one of the CCE subset candidates, wherein the CIF identifies the second carrier as associated with the one of the CCE subset candidates, anddecoding the DCI for a resource grant on the second carrier based on the CIF.

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