Method and device for distributing idle user equipment in multi-carrier based mobile communication system

A base station for supporting cell reselection of a user equipment (UE) in a multi-carrier based wireless communication system, the base station comprising:

• a transceiver;
• and
• a controller coupled with the transceiver and configured to:
• determine a cell reselection priority of each carrier based on a load of the each carrier, and
• transmit, to the UE, a radio resource control (RRC) message including information representing the determined cell reselection priority of the each carrier.

A user equipment (UE) for performing cell reselection in a multi-carrier based wireless communication system, the UE comprising:

• a transceiver;
• and
• a controller coupled with the transceiver and configured to:
• receive, from a base station, a radio resource control (RRC) message including information representing a cell reselection priority of each carrier, the cell reselection priority of each carrier being determined based on a load of the each carrier, and
• perform the cell reselection based on the received information representing the cell reselection priority of the each carrier if the UE is in an idle state.