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Apparatus and method for performing uplink synchronization in wireless communication system

  • US 10,292,121 B2
  • Filed: 05/11/2017
  • Issued: 05/14/2019
  • Est. Priority Date: 05/27/2011
  • Status: Active Grant
First Claim
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1. A user equipment (UE) configured for performing an uplink synchronization on a first secondary serving cell of one or more secondary serving cells in a wireless communication system, the UE comprising:

  • a receiving unit configured to;

    receive resource control (RRC) configuration for carrier aggregation of a primary serving cell and the first secondary serving cell of the one or more secondary serving cells;

    receive resource control (RRC) configuration for an extended physical downlink control channel (EPDCCH) for the first secondary serving cell from a base station (BS), wherein the RRC configuration configures the UE;

    to receive EPDCCH on a particular serving cell, wherein whether to receive EPDCCH is configured for each serving cell, wherein the UE does not receive a physical downlink control channel (PDCCH) transmitted in a UE-specific manner on the PDCCH on a specific serving cell when configured for receiving EPDCCH on the specific serving cell; and

    with a configured UE search space for EPDCCH reception, wherein a PDCCH search space is mapped to a control region at the start of a subframe and an EPDCCH search space is mapped to a data region in the subframe following the control region, wherein the configured UE search space for EPDCCH reception is indicated in the RRC configuration;

    wherein the receiving unit is further configured to;

    detect, in a first secondary serving cell for which the UE is configured for EPDCCH reception, downlink control information (DCI) mapped to an EPDCCH intended for the UE in the configured UE search space for EPDCCH using the blind decoding method based on a cyclic redundancy check (CRC);

    identify, within the received DCI mapped to the EPDCCH, an initiation indicator of a non-contention random access procedure to obtain uplink timing on the secondary serving cell;

    wherein the UE receives the indication through only the EPDCCH in the first secondary serving cell.

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