Method for signaling control information, and apparatus therefor
The present invention relates to a wireless communication system, and more particularly, to a method for a terminal to transmit and receive control information and/or a response signal in a carrier aggregation-based wireless communication system, and to an apparatus therefor, wherein the method includes the steps of: constituting a first cell group having a PCell; constituting a second cell group having at least one SCell; and carrying out a process for transmitting and receiving specific cell-related control information and/or a response signal. The control information and/or the response signal are transmitted and received on the first cell group or the second cell group in the event the first cell group and the second cell group are managed by the same base station. The control information and/or the response signal are transmitted and received on only the first cell group or the second cell group depending on the type of the control information in the event the first cell group and the second cell group are managed by different base stations.
1. A method for transmitting and receiving at least one of control information and a response signal at a user equipment (UE) in a carrier aggregation based wireless communication system, the method comprising:
configuring a first cell group having a primary cell (PCell);
configuring a second cell group having one or more secondary cells (SCells);
performing a procedure of transmitting and receiving at least one of specific cell-related control information and a response signal,
wherein, if the first cell group and the second cell group are managed by the same base station, at least one of the control information and the response signal is transmitted and received on the first cell group or the second cell group, and
wherein, if the first cell group and the second cell group are managed by different base stations, at least one of the control information and the response signal is transmitted and received only on one of the first cell group or the second cell group according to control information type.
2. The method according to claim 1 , wherein, if the first cell group and the second cell group are managed by different base stations and the control information includes at least one of radio resource control (RRC) configuration/reconfiguration related information, radio link monitoring (RLM) related information, radio resource management (RRM) related information and handover related information, at least one of the control information and the response signal is transmitted and received only on the first cell group.
3. The method according to claim 1 , wherein, if the first cell group and the second cell group are managed by different base stations and the control information includes at least one of an SCell activation/deactivation message, a timing advance command (TAC), downlink control information (DCI) and aperiodic channel state information (CSI), at least one of the control information and the response signal is transmitted and received on a cell group, to which the specific cell belongs.
4. The method according to claim 1 , wherein:
if the control information includes a timing advance command (TAC) and the first cell group and the second cell group are managed by the same base station, the TAC includes a per-timing advance group (TAG) TAC for at least one of the first cell group and the second cell group, and
if the control information includes the TAC and the first cell group and the second cell group are managed by different base stations, the TAC includes only a per-TAG TAC for a cell group, to which the specific cell belongs.
5. The method according to claim 1 , wherein:
if the control information includes downlink control information (DCI) and the first cell group and the second cell group are managed by the same base station, the DCI includes scheduling information of at least one of the first cell group and the second cell group, and
if the control information includes the DCI and the first cell group and the second cell group are managed by different base stations, the DCI includes only scheduling information of a cell group, to which the specific cell belongs.
6. A user equipment (UE) configured to transmit and receive at least one of control information and a response signal in a carrier aggregation based wireless communication system, the UE comprising:
a radio frequency (RF) unit; and
a processor,
wherein the processor is configured to configure a first cell group having a primary cell (PCell), to configure a second cell group having one or more secondary cells (SCells) and to perform a procedure of transmitting and receiving at least one of specific cell-related control information and a response signal,
wherein, if the first cell group and the second cell group are managed by the same base station, at least one of the control information and the response signal is transmitted and received on the first cell group or the second cell group, and
wherein, if the first cell group and the second cell group are managed by different base stations, at least one of the control information and the response signal is transmitted and received only on one of the first cell group or the second cell group according to control information type.
7. The UE according to claim 6 , wherein, if the first cell group and the second cell group are managed by different base stations and the control information includes at least one of radio resource control (RRC) configuration/reconfiguration related information, radio link monitoring (RLM) related information, radio resource management (RRM) related information and handover related information, at least one of the control information and the response signal is transmitted and received only on the first cell group.
8. The UE according to claim 6 , wherein, if the first cell group and the second cell group are managed by different base stations and the control information includes at least one of an SCell activation/deactivation message, a timing advance command (TAC), downlink control information (DCI) and aperiodic channel state information (CSI), at least one of the control information and the response signal is transmitted and received on a cell group, to which the specific cell belongs.
9. The UE according to claim 6 , wherein:
if the control information includes a timing advance command (TAC) and the first cell group and the second cell group are managed by the same base station, the TAC includes a per-timing advance group (TAG) TAC for at least one of the first cell group and the second cell group, and
if the control information includes the TAC and the first cell group and the second cell group are managed by different base stations, the TAC includes only a per-TAG TAC for a cell group, to which the specific cell belongs.
10. The UE according to claim 6 , wherein:
if the control information includes downlink control information (DCI) and the first cell group and the second cell group are managed by the same base station, the DCI includes scheduling information of at least one of the first cell group and the second cell group, and
if the control information includes the DCI and the first cell group and the second cell group are managed by different base stations, the DCI includes only scheduling information of a cell group, to which the specific cell belongs.