Apparatus and method for cluster based opportunistic power control in wireless communication system

A method for a cluster-based power control at a femto base station in a wireless communication system, the method comprising:

• receiving an interference allowance value, comprising transmission power of operating femto cells, based on aggregate interference of the operating femto cells so that a Quality of Service (QoS) of a macro cell user is met, from a macro base station;
• allocating power to a terminal with consideration of a path loss in a range of the interference allowance value received based on position information of the femto base station;
• and
• updating the interference allowance value with consideration of a channel activity for each femto cell in a cluster,
• wherein the transmission power of the operating femto cells is allocated with consideration of large-scale fading, and
• wherein the interference allowance value is determined per femto cell by multiplying an uplink power of a femto cell user by a power loss equation.

An apparatus of a macro base station for performing a cluster-based power control in a wireless communication system, the apparatus comprising:

• a backhaul communication unit configured to communicate with a different node;
• and
• a controller configured to determine an interference allowance value, comprising transmission power of operating femto cells, based on aggregate interference of the operating femto cells so that a Quality of Service (QoS) of a macro cell user is met, to broadcast the interference allowance value to the femto cells, and to update the interference allowance value with consideration of a channel activity for each femto cell in a cluster,
• wherein the transmission power of the operating femto cells is allocated with consideration of large-scale fading, and
• wherein the interference allowance value is determined per femto cell by multiplying an uplink power of a femto cell user by a power loss equation.

An apparatus of a femto base station for performing a cluster-based power control in a wireless communication system, the apparatus comprising:

• a backhaul communication unit configured to communicate with a different node;
• and
• a controller configured to receive an interference allowance value, comprising transmission power of operating femto cells, based on aggregate interference of the operating femto cells so that a Quality of Service (QoS) of a macro cell user is met, via the backhaul communication unit from a macro base station, to allocate power to a terminal with consideration of a path loss in a range of an interference allowance value received based on position information of the femto base station, and to update the interference allowance value with consideration of a channel activity for each femto cell in a cluster,
• wherein the transmission power of the operating femto cells is allocated with consideration of large-scale fading, and
• wherein the interference allowance value is determined per femto cell by multiplying an uplink power of a femto cell user by a power loss equation.