Method of controlling interference from femtocells in consideration of macrocell

A method of controlling interference of a femtocell at a femtocell base station, comprising:

• (a) dividing frequency resources allocated to the femto cell into a plurality of physical resource block (PRB) groups each having at least one PRB and dividing the plurality of PRB groups into N power control PRB groups each having at least one PRB group, wherein N is a natural number not less than 2;
• (b) performing a service of the femtocell by applying one of at least two transmission power stages to transmission power for each of the power control PRB groups during a first period;
• and
• (c) performing the service of the femtocell during a second period after the first period by decreasing the transmission power stage set in the first period for the power control PRB group with a degraded interference level and maintaining or increasing the transmission power stage set in the first period for the power control PRB group with an improved interference level after measuring the interference for each of the power control PRB groups during the first period.