Patent ID: 8830851

Claim:
An operating method of a compact base station for supporting coverage area expansion of a compact cell in a heterogeneous network system, the method comprising: determining whether an overload takes place in a coverage area where a compact base station and a plurality of terminals communicate using a first Frequency Assignment (FA) in a compact cell; when the overload takes place in the coverage area where the compact base station and the plurality of terminals communicate using the first FA in the compact cell, determining whether resources are redistributable using a second FA in a coverage area expanded according to coverage area expansion of the compact cell; and when the resources are redistributable using the second FA in the coverage area expanded according to the coverage area expansion of the compact cell, changing the FA of at least one of the plurality of terminals communicating with the compact base station using the first FA in the compact cell, from the first FA to the second FA, wherein the first FA is a common FA of the compact cell and a macrocell, the second FA is a dedicated FA of the compact cell, and the second FA is used in the coverage area expanded according to the coverage area expansion of the compact cell.