Method and apparatus for managing multiple timing advance groups in mobile communication system supporting carrier aggregation

A method for managing at least one timing advance group (TAG) by a terminal in a wireless communication system supporting carrier aggregation, the method comprising:

• receiving first control information on configuring a first cell;
• receiving second control information on configuring a second cell, the second control information including a TAG identifier if the second cell is not part of a TAG of the first cell, the second control information not including a TAG identifier if the second cell is part of the TAG of the first cell;
• receiving MAC control element (MAC CE) including a TAG identifier and timing advance command (TAC) associated with at least one of the first cell and the second cell for time alignment of a TAG associated with the TAG identifier;
• and
• applying the TAC for the TAG associated with the TAG identifier,
• wherein the TAG of the first cell is a primary TAG (PTAG) including a primary cell (PCell),
• wherein a TAG of the cell is assigned to the terminal as the PTAG if the TAG identifier of the cell is not included in the control information, and
• wherein a TAG of the cell is assigned to the terminal as a secondary TAG (STAG) corresponding to the TAG identifier if the TAG identifier of the cell is included in the control information.

A base station for managing at least one timing advance group (TAG) in a wireless communication system supporting carrier aggregation, the base station comprising:

• a transmitter configured to transmit data;
• and
• a controller configured to:
• map each of at least one cell to at least one TAG, the TAG including at least one cell corresponding to same uplink timing advance;
• identify whether a cell to be configured is part of a primary TAG (PTAG) including a primary cell (PCell);
• transmit, to a terminal, control information including a TAG identifier of the cell, if the cell is not part of the PTAG;
• and
• transmit, to the terminal, control information without a TAG identifier of the cell, if the cell is part of the PTAG,
• wherein a TAG of the cell is assigned to the terminal as the PTAG if the TAG identifier of the cell is not included in the control information, and
• wherein a TAG of the cell is assigned to the terminal as a secondary TAG (STAG) corresponding to the TAG identifier if the TAG identifier of the cell is included in the control information.

A terminal for managing at least one timing advance group (TAG) in a wireless communication system supporting carrier aggregation, the terminal comprising:

• a receiver configured to receive data;
• and
• a controller configured to:
• receive first control information on configuring a first cell;
• receive second control information on configuring a second cell, the second control information including a TAG identifier if the second cell is not part of a TAG of the first cell, the second information not including a TAG identifier if the second cell is part of the TAG of the first cell;
• receive MAC control element (MAC CE) including a TAG identifier and timing advance command (TAC) associated with at least one of the first cell and the second cell for time alignment of a TAG associated with the TAG identifier;
• and
• apply the TAC for the TAG associated with the TAG identifier,
• wherein the TAG of the first cell is a primary TAG (PTAG) including a primary cell (PCell),
• wherein a TAG of the cell is assigned to the terminal as the PTAG if the TAG identifier of the cell is not included in the control information, and
• wherein a TAG of the cell is assigned to the terminal as a secondary TAG (STAG) corresponding to the TAG identifier if the TAG identifier of the cell is included in the control information.