Patent ID: 8731565

Claim:
A method of performing a handover from a macro cell to a closed subscriber group (CSG) cell in a wireless communication system, the method comprising: transmitting, by a user equipment to a macro cell, first proxy information which indicates that the user equipment enters an area of a first member CSG cell to which the user equipment previously accessed, the first proxy information comprising first frequency information and a first proxy identifier, the first frequency information indicating a first frequency on which the first member CSG cell is operating, the first proxy identifier identifying the first proxy information; receiving, by the user equipment from the macro cell, a handover command which commands a handover from the macro cell to a target CSG cell, the handover command comprising a set of received proxy identifiers; and performing, by the user equipment, the handover from the macro cell to the target CSG cell; wherein if the user equipment enters an area of a second member CSG cell to which the user equipment previously accessed, the method further comprises: determining, by the user equipment, whether to transmit second proxy information for announcing that an additional frequency to be considered in a handover procedure is detected by comparing a second proxy identifier for a second frequency on which the second member CSG cell is operating with the set of received proxy identifiers in the handover command; and transmitting, by the user equipment to the target CSG cell, the second proxy information after completing the handover if the second proxy identifier is not included in the set of received proxy identifiers, the second proxy information indicating that the user equipment enters the area of the second member CSG cell, the second proxy information comprising second frequency information and the second proxy identifier, the second frequency information indicating the second frequency as the additional frequency, the second proxy identifier identifying the second proxy information.