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Method and apparatus for performing random access in a mobile communication system

  • US 10,448,427 B2
  • Filed: 01/29/2015
  • Issued: 10/15/2019
  • Est. Priority Date: 01/29/2014
  • Status: Active Grant
First Claim
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1. A method by a terminal communicating with a master base station and a secondary base station, the method comprising:

  • receiving, from a master base station, a message to reconfigure a secondary cell group (SCG) associated with a secondary base station, the message including configuration information related to the SCG;

    reconfiguring the SCG based on the message;

    identifying whether the configuration information related to the SCG includes mobility control information related to the SCG;

    starting a timer with a timer value included in the mobility control information related to the SCG based on the configuration information including mobility control information related to the SCG;

    starting to synchronize to a downlink of a primary secondary cell (PSCell) based on the configuration information including the mobility control information related to the SCG;

    initiating a random access procedure on the PSCell based on preamble information included in the mobility control information related to the SCG based on the configuration information including the mobility control information related to the SCG; and

    transmitting, to the master base station, a response message in response to the message,wherein the timer is stopped in response to the random access procedure being completed successfully.

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