In carrier aggregation, the UE only has one RRCconnection with the network. According to carrier aggregation capability, multiple component carriers are aggregated into overall wider bandwidth, where the UE can establish multiple links corresponding to the multiple component carriers for simultaneously receiving and transmitting. LTE-Advanced system targets faster switching between power states, improves performance at the cell edge, and includes subjects, such as bandwidth extension, coordinated multipoint transmission/reception (COMP), uplink multiple input multiple output (MIMO), etc.For bandwidth extension, carrier aggregation is introduced to the LTE-Advanced system for extension to wider bandwidth, where two or more component carriers are aggregated, for supporting wider transmission bandwidths (for example up to 100MHz) and for spectrum aggregation. Description of the Prior ArtToward advanced high-speed wireless communication system, such as transmitting data in a higher peak data rate, LTE-Advanced system is standardized by the 3rd Generation Partnership Project (33GPP) as an enhancement of LTE system.

Field of the InventionThe application relates to a method utilized in a wireless communication system, and more particularly, to a method of handling random access procedure with deactivation timer in a wireless communication system.2.

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