The control message processor 1035 is capable of processing control messages from the UE and performing corresponding operations. The control message processor 1035 is also capable of creating control messages to be transmitted to the UE and transmitting them to the lower layer.
The upper layer devices 1025 and 1030 can be configured according to bearers. The upper layer devices 1925 and 1930 process data, transmitted from S-GW or another ENB, to RLCPDU, and transfer it to the multiplexer and demultiplexer 1020. The upper layer devices 1025 and 1930 also process RLC PDU, from the multiplexer and demultiplexer 1020, to PDCP SDU, and transfer it to the S-GW or the other ENB.
The scheduler 1015 allocates transmission resources to UE at a proper time point, considering the buffer state, channel state, etc., of the UE. The scheduler 1015 processes: a signal transmitted from UE; or a signal to be transmitted to UE.
The controller 1010 is capable of controls the operations related to the measurement and radio resource control. The controller 1010 is also capable of controlling various operations of the ENB, e.g., operations of ENB described above referring to 
For example, the controller 1010 is capable of receiving information indicating a condition as to whether physical uplink control channel (PUCCH) feedback for each SCell configured to UE is transmitted via an SCell (e.g., PUCCH SCell) from among the SCells.