Method for transmitting and receiving downlink control information in wireless communication system and device for same
Disclosed are a method for transmitting and receiving downlink control information (DCI) in a wireless communication system and a device for same. Particularly, in a method for receiving downlink control information by a terminal in a wireless communication system, the method can comprise the steps of: receiving first DCI from a base station via a first downlink control channel on the basis of a first transmission time interval (TTI); and receiving second DCI from the base station by means of control channel information via a second downlink control channel on the basis of a second TTI, wherein the first DCI comprises the control channel information indicating one or more merge levels relating to the reception of the second DCI among a plurality of predetermined merge levels.
1. A method for receiving, by a user equipment, downlink control information (DCI) in a wireless communication system, the method comprising:
receiving, from a base station, first DCI on a first downlink control channel based on a first transmission time interval (TTI),
wherein the first DCI includes control channel information for a specific control channel element (CCE) aggregation level of at least one CCE aggregation level among a plurality of predetermined CCE aggregation levels; and
receiving, from the base station, the second DCI on a second downlink control channel based on a second TTI using the control channel information.
2. The method of claim 1 , wherein the specific CCE aggregation level is a maximum CCE aggregation level of the at least one CCE aggregation level.
3. The method of claim 1 ,
wherein the plurality of predetermined CCE aggregation levels is configured as one or more CCE aggregation level groups, and
wherein the control channel information includes a specific CCE aggregation level group of the one or more CCE aggregation level groups.
4. The method of claim 3 , further comprising receiving, from the base station, includes aggregation level configuration information for the one or more CCE aggregation level groups by higher layer signaling.
5. The method of claim 1 ,
wherein the at least one CCE aggregation level is configured to a CCE aggregation level corresponding to a predetermined offset range around the specific CCE aggregation level.
6. The method of claim 5 , wherein the predetermined offset range is configured to be movable within the plurality of predetermined CCE aggregation levels according to a sliding indicator.
7. The method of claim 6 , wherein the control channel information further includes window information for the predetermined offset range and the sliding indicator.
8. The method of claim 6 , further comprising:
receiving, from the base station, window information for the predetermined offset range by higher layer signaling,
wherein the sliding indicator is included in the control channel information.
9. The method of claim 1 ,
wherein the first DCI further includes information for a valid time interval of the control channel information, and
wherein the valid time interval is configured in units of subframe.
10. The method of claim 1 , wherein the control channel information is differently configured depending on whether the second DCI is DCI for uplink or DCI for downlink.
11. The method of claim 1 ,
wherein the first TTI relates to a time for transmitting one subframe, and
wherein the second TTI is configured to be shorter than the first TTI.
12. The method of claim 1 ,
wherein the second TTI is configured to be shorter than the first TTI,
wherein the first downlink control channel is a physical downlink control channel (PDCCH), and
wherein the second downlink control channel is a short PDCCH (sPDCCH).
13. A user equipment receiving downlink control information (DCI) in a wireless communication system, the user equipment comprising:
a radio frequency (RF) unit configured to transmit and receive a radio signal; and
a processor functionally connected to the RF unit,
wherein the processor controls to:
receive, from a base station, first DCI on a first downlink control channel based on a first transmission time interval (TTI),
wherein the first DCI includes control channel information for a specific control channel element (CCE) aggregation level of at least one CCE aggregation level related to a reception of second DCI among a plurality of predetermined CCE aggregation levels; and
receive, from the base station, the second DCI on a second downlink control channel based on a second TTI using the control channel information.