Method and apparatus for carrier aggregation communication in wireless communication system

A first base station providing a macro cell operated as a frequency division duplex (FDD) communication with a user equipment (UE), wherein a coverage of the macro cell includes at least one small cell provided by at least one second base station, and wherein the at least one small cell is operated as a time division duplex (TDD) communication with the UE, the first base station comprising:

• a transceiver;
• and
• a controller operable to:
• control the transceiver to transmit, to a UE, first control information for a control plane for indicating an addition of a first small cell of the at least one small cell included in the coverage of the macro cell and for indicating an activation of the first small cell,
• identify whether the UE is within a coverage of the first small cell,
• as a result of identifying that the UE is within the coverage of the first small cell, control the transceiver to transmit data for the control plane to the UE while data for a user plane is wirelessly transmitted to the UE via a second user plane of the first small cell only from one of the at least one second base station providing the first small cell and data for the user plane is not wirelessly transmitted to the UE via a first user plane of the macro cell from the first base station providing the macro cell,
• generate second control information for the control plane for indicating to release the first small cell based on measurement information received from the UE,
• control the transceiver to transmit the second control information to the UE, and
• control the transceiver to transmit data for the user plane to the UE in response to the second control information being transmitted to the UE,
• wherein transmitting data, via the first user plane, is deactivated, based on identifying that the UE is within the coverage of the first small cell and the data for the user plane is transmitted to the UE via the second user plane.

A method performed by a user equipment (UE) in communication with a first base station providing a macro cell operated as a frequency division duplex (FDD), wherein a coverage of the macro cell includes at least one small cell provided by at least one second base station, and wherein the at least one small cell is operated as a time division duplex (TDD) communication with the UE, the method comprising:

• receiving, from a first base station, first control information for a control plane for indicating an addition of a first small cell of the at least one small cell included in the coverage of the macro cell and for indicating an activation of the first small cell;
• as a result of identifying that the UE is within a coverage of the first small cell, receiving, from the first base station, data for the control plane to the UE while data for a user plane is wirelessly transmitted to the UE via a second user plane of the first small cell only from one of the at least one second base station providing the first small cell and data for the user plane is not wirelessly transmitted to the UE via a first user plane of the macro cell from the first base station providing the macro cell;
• receiving, from the first base station, second control information for the control plane for indicating to release the first small cell based on measurement information received from the UE;
• and
• receiving, from the first base station, data for the user plane in response to the second control information being received from the first base station,
• wherein receiving data, via the first user plane, is deactivated, based on identifying that the UE is within the coverage of the first small cell and the data for the user plane is transmitted to the UE via the second user plane.

A user equipment (UE) in communication with a first base station providing a macro cell operated as a frequency division duplex (FDD), wherein a coverage of the macro cell includes at least one small cell provided by at least one second base station, and wherein the at least one small cell is operated as a time division duplex (TDD) communication with the UE, the UE comprising:

• a transceiver;
• and
• a controller operable to control the transceiver to:
• receive, from a first base station, first control information for a control plane for indicating an addition of a first small cell of the at least one small cell included in the coverage of the macro cell and for indicating an activation of the first small cell,
• as a result of identifying that the UE is within a coverage of the first small cell, receive, from the first base station, data for the control plane to the UE while data for a user plane is wirelessly transmitted to the UE via a second user plane of the first small cell only from one of the at least one second base station providing the first small cell and data for the user plane is not wirelessly transmitted to the UE via a first user plane of the macro cell from the first base station providing the macro cell,
• receive, from the first base station, second control information for the control plane for indicating to release the first small cell based on measurement information received from the UE, and
• receive, from the first base station, data for the user plane in response to the second control information being received from the first base station,
• wherein receiving data, via the first user plane, is deactivated, based on identifying that the UE is within the coverage of the first small cell and the data for the user plane is transmitted to the UE via the second user plane.

A first base station providing a macro cell operated as a frequency division duplex (FDD) communication with a user equipment (UE), wherein a coverage of the macro cell includes at least one small cell provided by at least one second base station, and wherein the at least one small cell is operated as a time division duplex (TDD) communication with the UE, the first base station comprising:

• a transceiver;
• and
• a controller operable to:
• control the transceiver to transmit, to a UE, first control information for a control plane for indicating an addition of a first small cell of the at least one small cell included in the coverage of the macro cell and for indicating an activation of the first small cell,
• identify whether the UE is within a coverage of the first small cell,
• as a result of identifying that the UE is within the coverage of the first small cell, control the transceiver to transmit data for the control plane to the UE while data for a user plane is wirelessly transmitted to the UE via a second user plane of the first small cell only from one of the at least one second base station providing the first small cell and data for the user plane is not wirelessly transmitted to the UE via a first user plane of the macro cell from the first base station providing the macro cell,
• generate second control information for the control plane for indicating to release the first small cell based on measurement information received from the UE,
• control the transceiver to transmit the second control information to the UE, and
• control the transceiver to transmit data for the user plane to the UE in response to the second control information being transmitted to the UE,
• wherein transmitting data, via the first user plane, is deactivated, based on identifying that the UE is within the coverage of the first small cell and the data for the user plane is transmitted to the UE via the second user plane.