After receiving the control message from the UE, the ENB determines whether it needs to add (release) the reported cell to the UE, and then adds (or releases) the unlicensed band cell to the UE based on the determination. Alternatively, after the ENB checks the distribution of cells of other operators and the same operators, distributed according to frequencies, by using the information, it moves a cell, using an unlicensed band frequency and currently under the control of the ENB, to another unlicensed band frequency, or activates a cell of a new unlicensed band frequency.
UE 3301 is capable of attempting to access a cell 3305 using a licensed band of the ENB 3303 and establishing a connection with the ENB 3303 in operation 3311. The expression ‘to establish a connection’ is used in the sense that UE and ENB are connected to each other and performs transmission/reception of data therebetween. The connection is established by using messages of Radio Resource Control (RRC) layer.