Method for receiving control information in wireless communications system and apparatus therefor
The present invention relates to a wireless communication system. More specifically, a method for enabling a terminal to receive control information in a wireless communications system according to the present invention includes the steps of: constituting PCell and SCell; and monitoring a plurality of expected channels in a search space to receive the control information from a sub-frame #n in SCell, wherein if the sub-frame #n is included in a particular sub-frame set, the search space includes CSS, or if the sub-frame #n is not included in the particular sub-frame set, the search space includes only USS.
1. A method for receiving, by a User Equipment (UE), control information in a wireless communication system, comprising:
configuring a primary cell (PCell) and a secondary cell (SCell); and monitoring a plurality of control channel candidates within a search space for receiving the control information in subframe #n in the SCell,
wherein, when the subframe #n is included in a specific subframe set, the search space includes a common search space (CSS) of the SCell, and a process of monitoring control channel candidates with a downlink control information (DCI) format 1C is skipped from a CSS of the PCell in subframe #n,
wherein, when the subframe #n is not included in the specific subframe set, the search space includes only a user-specific search space (USS),
wherein the DCI format 1C is used for Physical Downlink Shared Channel (PDSCH) compact scheduling or Multimedia Control Channel (MCCH) change notification.
2. The method according to claim 1 , wherein the specific subframe set includes a plurality of periodically configured subframe patterns.
3. The method according to claim 1 , wherein the specific subframe set includes at least one of the following:
(i) a subframe configured to transmit system information in the SCell or a cell group including the SCell;
(ii) a subframe configured to transmit a paging signal in the SCell; or
(iii) a multicast broadcast single frequency network (MBSFN) subframe in the SCell.
4. The method according to claim 3 , wherein the specific subframe set includes at least one of the following:
(i) a subframe configured not to transmit system information in the PCell;
(ii) a subframe configured not to transmit a paging signal in the PCell; or
(iii) a non-MBSFN subframe in the PCell.
5. The method according to claim 1 , wherein the specific subframe set includes a random access response (RAR) window for a physical random access channel (PRACH) signal transmitted from the SCell or the cell group including the SCell.
6. A User Equipment (UE) configured to receive control information in a wireless communication system, comprising: a radio frequency (RF) unit; and a processor,
wherein the processor is configured to configure a primary cell (PCell) and a secondary cell (SCell) and to monitor a plurality of control channel candidates within a search space for receiving the control information in subframe #n in the SCell,
wherein, when the subframe #n is included in a specific subframe set, the search space includes a common search space (CSS) of the SCell, and a process of monitoring control channel candidates with a downlink control information (DCI) format 1C is skipped from a CSS of the PCell in subframe #n,
wherein, when the subframe #n is not included in the specific subframe set, the search space includes only a user-specific search space (USS),
wherein the DCI format 1C is used for Physical Downlink Shared Channel (PDSCH) compact scheduling or Multimedia Control Channel (MCCH) change notification.
7. The UE according to claim 6 , wherein the specific subframe set includes a plurality of periodically configured subframe patterns.
8. The UE according to claim 6 , wherein the specific subframe set includes at least one of the following:
(i) a subframe configured to transmit system information in the SCell or a cell group including the SCell;
(ii) a subframe configured to transmit a paging signal in the SCell; or
(iii) a multicast broadcast single frequency network (MBSFN) subframe in the SCell.
9. The UE according to claim 8 , wherein the specific subframe set includes at least one of the following:
(i) a subframe configured not to transmit system information in the PCell;
(ii) a subframe configured not to transmit a paging signal in the PCell; or
(iii) a non-MBSFN subframe in the PCell.
10. The UE according to claim 8 , wherein the specific subframe set includes a random access response (RAR) window for a physical random access channel (PRACH) signal transmitted from the SCell or the cell group including the SCell.