Patent ID: 8599686

Claim:
A computing device-implemented method in which user equipment performs a call admission procedure in a carrier aggregation system which provides multiple component carriers, comprising: transmitting a connection setup request message for communication with the respective component carriers, to a base station; and receiving a connection setup admission message or a connection setup rejection message from the base station in response to the connection setup request message received at the base station, and, in the event of receiving the connection setup rejection message, changing component carriers selected by the user equipment to other component carriers, or, in the event of receiving the connection setup admission message, establishing uplink timing alignment between the component carriers selected by the user equipment, wherein the receiving of the connection setup rejection message includes: receiving the connection setup rejection message that includes information about the component carries that can be used by the user equipment, and changing a component carrier selected for a primary physical layer which is one among a plurality of physical layers included in the user equipment based on the information about the component carriers that can be used by the user equipment.