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Method in which user equipment performs random access in a carrier aggregation mobile communication system

  • US 8,774,112 B2
  • Filed: 06/07/2010
  • Issued: 07/08/2014
  • Est. Priority Date: 06/07/2009
  • Status: Active Grant
First Claim
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1. A method for performing a random access procedure to a base station at a User Equipment (UE) in a mobile communication system using carrier aggregation in which communication is performed using a plurality of component carriers, the method comprising:

  • transmitting a first random access preamble to the base station through a first uplink component carrier (UL CC) from among a plurality of UL CCs;

    receiving a first random access response message including a backoff indicator as a response to the first random access preamble through a first downlink component carrier (DL CC) corresponding to the first UL CC;

    applying a backoff period to the first UL CC in consideration of the backoff indicator received through the first random access response message; and

    transmitting a second random access preamble to the base station through a second UL CC to which a backoff period is not applied from among the plurality of UL CCs even during the backoff period of the first UL CC.

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