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Method for a user terminal to random access a carrier aggregation mobile communication system

  • US 9,930,701 B2
  • Filed: 03/09/2017
  • Issued: 03/27/2018
  • Est. Priority Date: 06/07/2009
  • Status: Active Grant
First Claim
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1. A method for performing a random access procedure by a user equipment (UE) configured with a plurality of downlink component carriers (DL CCs) and a plurality of uplink component carriers (UL CCs), the method comprising:

  • transmitting a random access preamble through one of the plurality of UL CCs;

    receiving a random access response message in response to the random access preamble;

    transmitting an identifier of the UE; and

    determining whether the random access procedure is successful according to whether a contention resolution message is received before a contention resolution timer expires,wherein when physical downlink control channel (PDCCH) information is received through a first DL CC, and the PDCCH information is indicated by the same identifier transmitted by the UE, the UE considers the PDCCH information as the contention resolution message, andwherein when the PDCCH information is received through another DL CC different from the first DL CC, the UE does not consider the PDCCH information as the contention resolution message even if the PDCCH information is indicated by the same identifier transmitted by the UE.

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