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

  • US 8,861,460 B2
  • Filed: 06/07/2010
  • Issued: 10/14/2014
  • Est. Priority Date: 06/07/2009
  • Status: Active Grant
First Claim
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1. A method for performing a random access procedure in a mobile communication system supporting carrier aggregation using a primary carrier and one or more secondary carriers, the method performed by a User Equipment (UE) and comprising:

  • transmitting a first message comprising a random access preamble to an evolved NodeB (eNB) through the primary carrier;

    receiving a second message including first uplink (UL) grant information as a response to the random access preamble through the primary carrier;

    transmitting a third message including identity information of the UE to the eNB through an uplink radio resource corresponding to the first UL grant information; and

    receiving a Physical Downlink Control Channel (PDCCH) indicated by the identity information of the UE from the eNB,wherein, when the PDCCH is received through the primary carrier, the UE considers a contention resolution procedure according to transmission of the third message as a successful procedure, andwherein, when the PDCCH is received through the one or more secondary carriers, the UE considers the contention resolution procedure as an unsuccessful procedure.

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