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Method and apparatus of configuring downlink timing and transmitting random access response in mobile communication system using carrier aggregation

  • US 9,585,188 B2
  • Filed: 01/22/2015
  • Issued: 02/28/2017
  • Est. Priority Date: 04/05/2011
  • Status: Active Grant
First Claim
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1. A method for uplink timing adjustment by a base station, the method comprising:

  • transmitting, to a terminal, a radio resource control message to configure a secondary cell (SCell) for a carrier aggregation (CA);

    generating a medium access control (MAC) protocol data unit (PDU) including a MAC control element (MAC CE), wherein the MAC CE includes an identity of a timing advance group (TAG) including the SCell and a timing advance command (TAC) for uplink timing adjustment of the TAG including the SCell; and

    transmitting the MAC PDU to the terminal,wherein the TAG is a group of at least one cell having same uplink timing,wherein the identity of the TAG is set to 0 if the TAG including the SCell is a primary TAG (PTAG), andwherein the PTAG is a TAG that includes a primary cell (PCell).

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