Method and apparatus for controlling and supporting a dynamic cell on/off in wireless access system

A method for controlling transmission power upon cell on/off in a wireless access system, the method comprising:

• powering on with initial transmission power by a second cell;
• adjusting a handover offset to reduce interference with a first cell neighboring to the second cell by the second cell;
• transmitting power information indicating the initial transmission power and handover offset information about the adjusted handover offset to at least one of the first cell and a User Equipment (UE) by the second cell;
• performing handover with the UE receiving the handover offset information by the second cell;
• and
• transmitting to the UE a power level indicator message indicating an on transmission power adjusted from the initial transmission power based on the handover offset by the second cell.

An apparatus for supporting on or off of a second cell in a wireless access system, the apparatus comprising:

• a transmitter;
• a receiver;
• and
• a processor configured to support the on/off of the second cell,
• wherein the processor controls the receiver to receive a cell on/off state indicator message indicating on or off of the second cell from the second cell, adjusts a handover offset of the second cell, taking into account interference caused by the on or off of the second cell, and controls the transmitter to transmit handover offset information about the adjusted handover offset to at least one of the second cell and a first User Equipment (UE).