Apparatus and method for performing wireless connection re-establishment in a multiple component carrier system

A method of User Equipment (UE) performing radio connection re-establishment in a multiple component carrier system, the method comprising steps of:

• selecting a cell for re-establishment of radio connection when the radio connection fails;
• configuring secondary cell configuration information (SCell CI) that specifies at least one secondary serving cell configured in the UE;
• sending a radio connection re-establishment request message, requesting the re-establishment of the radio connection to an evolved-NodeB (eNB) through the selected cell;
• receiving a radio connection re-establishment message as a response to the radio connection re-establishment request message;
• and
• sending a radio connection re-establishment completion message, indicating that a radio connection re-establishment procedure has been completed, to the eNB through the selected cell,
• wherein the SCell CI is included in at least one of the radio connection re-establishment request message and the radio connection re-establishment completion message.

An evolved-NodeB (eNB) performing radio connection re-establishment in a multiple component carrier system, the eNB comprising:

• an uplink message reception unit receiving a radio connection re-establishment request message, requesting re-establishment of radio connection, or a radio connection re-establishment completion message, indicating that a radio connection re-establishment procedure has been completed, from User Equipment (UE) through a primary serving cell;
• an secondary cell (SCell) modification information configuration unit making a determination of whether to remove or change at least one secondary serving cell configured in the UE with reference to SCell Configuration Information (CI), included in at least one of the radio connection re-establishment request message and the radio connection re-establishment completion message and specifying the at least one secondary serving cell, and configuring SCell modification information indicative of an addition, removal, or change of a secondary serving cell based on the determination;
• and
• a downlink message transmission unit sending a radio connection re-establishment message, comprising the SCell modification information, to the UE as a response to the radio connection re-establishment request message.