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RANDOM ACCESS METHOD USING NDI AND USER EQUIPMENT FOR THE SAME

  • US 20110305197A1
  • Filed: 02/03/2010
  • Published: 12/15/2011
  • Est. Priority Date: 02/06/2009
  • Status: Active Grant
First Claim
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1. A method of performing random access to a base station by a user equipment in a mobile communication system, the method comprising:

  • transmitting a random access preamble to the base station;

    receiving a random access response message including a first type identifier;

    transmitting an uplink (UL) message indicated by the first type identifier by a first Hybrid Automatic Repeat reQuest (HARQ) process according to the reception of the random access response message;

    setting a New Data Indicator (NDI) value corresponding to the first HARQ process to a first value;

    receiving a downlink (DL) message indicated by the first type identifier and including an NDI having a second value and a UL grant signal; and

    considering the random access as not successful if the first value and the second value of the NDIs are different from each other.

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