Apparatus and method for performing handover in multiple component carrier system

A target Base Station (BS) performing handover in a multiple component carrier system, the target BS comprising:

• a transmission and reception unit for sending and receiving information about the handover to and from a source BS;
• a list configuration unit for selecting a serving cell to be applied to a User Equipment (UE) which will handover and configuring a list regarding the selected serving cell;
• and
• a cell configuration unit for configuring the selected serving cell,
• wherein the transmission and reception unit receives service state information about a state of service, provided to the UE, from the source BS of the UE, and
• the list configuration unit selects the serving cell for the UE based on the received service state information.

A method of a source Base Station (BS) performing handover in a multiple component carrier system, the method comprising:

• receiving a measurement report from a User Equipment (UE);
• configuring a candidate cell list for handover of the UE based on the measurement report;
• sending a handover request message for the UE to a target BS;
• receiving a handover request ACK message for the UE from a target BS;
• determining the handover of the UE;
• and
• sending a handover command message to the UE,
• wherein the candidate cell list comprises information about at least one candidate cell, and
• the candidate cell list is included in the handover request message along with information about service provided to the UE and transmitted to the target BS.

A source Base Station (BS) performing handover in a multiple component carrier system, comprising:

• a transmission and reception unit for receiving a measurement report from a User Equipment (UE) and sending and receiving handover information about the UE;
• and
• a list configuration unit for selecting a handover candidate cell for the UE based on the measurement report of the UE and configuring a list including the selected handover candidate cell,
• wherein the transmission and reception unit sends the list of the handover candidate cell, together with service information about the UE, to a target BS related to handover of the UE.

A method of a User Equipment (UE) performing handover, comprising:

• receiving a handover command message;
• and
• establishing connection to a target Base Station (BS) in response to the handover command message,
• wherein the connection to the target BS is performed through one of handover final candidate cells selected by the target BS, from among handover candidate cells selected by a source BS, based on a measurement report received from the UE, and
• information about the handover final candidate cell is included in the handover command message and transferred from the source BS to the UE.

A User Equipment (UE) performing handover, comprising:

• a Radio Frequency (RF) unit for sending and receiving information;
• memory for storing necessary data;
• and
• a processor for performing a handover procedure with a target Base Station (BS) in response to a handover command message receive from a source BS,
• wherein the handover command message comprises information about a handover final candidate cells selected by the target BS, from among handover candidate cells selected by the source BS, based on measurement of the UE, and
• the processor performs the handover through one of the handover final candidate cells.