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Method and device for monitoring downlink channels

  • US 9,479,407 B2
  • Filed: 04/05/2013
  • Issued: 10/25/2016
  • Est. Priority Date: 04/05/2012
  • Status: Active Grant
First Claim
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1. A method for monitoring a downlink control channel by a user equipment (UE) in a wireless communication system, the method comprising:

  • determining, by the UE, whether a common search space is present in a physical downlink control channel (PDCCH) region or an enhanced physical downlink control channel (ePDCCH) region in a subframe; and

    monitoring, by the UE, when the common search space is present in the ePDCCH region, a downlink control channel for HARQ (hybrid automatic repeat request) ACK (acknowledgement)/NACK (non-acknowledgement) information in the ePDCCH region,wherein the monitoring includes;

    monitoring, by the UE, the ePDCCH based on a first candidate position in the common search space; and

    monitoring, by the UE, the HARQ ACK/NACK based on a second candidate position in the common search space, andwherein the first candidate position represents a start point of a resource region in which blind decoding is performed,wherein the common search space is present at a fixed position in the PDCCH region or the ePDCCH region in all subframes,wherein the PDCCH region is a region in which a PDCCH is monitored based on a cell-specific reference signal (CRS) in the subframe,wherein the CRS is a reference signal created based on a cell identifier,wherein the ePDCCH region is a region in which an ePDCCH is monitored based on a demodulation reference signal (DM-RS) in the subframe,wherein the DM-RS is a reference signal created based on a value given by a base station, andwherein the downlink control channel transports the HARQ ACK/NACK information for a plurality of UEs.

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