Method for transmitting and receiving downlink control information in wireless communication system and device therefor
Disclosed is a method for allowing a terminal to receive a downlink signal from a base station in a wireless communication system. More specifically, the method comprises the steps of: receiving a first control channel which indicates the location information of a resource allocated to a second control channel; receiving the second control channel, on the basis of a control format indicator contained in the first control channel; and obtaining a downlink grant and/or an uplink grant contained in the second control channel, wherein the second control channel is allocated with the resource contained in a data region of a specific subframe.
1. A method for receiving downlink channels from a base station at a user equipment in a wireless communication system, the method comprising:
receiving a control format indicator channel from the base station in a subframe comprising a plurality of symbols; and
receiving at least one of a first control channel or a second control channel in the subframe from the base station,
wherein a starting symbol of the first control channel is a first symbol of the plurality of symbols,
wherein a starting symbol of the second control channel is determined according to information included in the control format indicator channel or a Radio Resource Control (RRC) layer signaling, and
wherein:
if a parameter on the starting symbol of the second control channel is configured via the RRC layer signaling, the starting symbol of the second control channel is determined based on the parameter,
otherwise, the starting symbol of the second control channel is determined based on the information included in the control format indicator channel.
2. The method according to claim 1 , wherein information included in the control format indicator channel indicates both the starting symbol of the second control channel and an ending symbol of the first control channel.
3. The method according to claim 1 , wherein information included in the control format indicator channel includes information on frequency resources for the second control channel.
4. The method according to claim 1 , wherein information included in the control format indicator channel includes information indicating whether the first control channel exists or not in the subframe.
5. A user equipment in a wireless communication system, the user equipment comprising:
a reception module for receiving downlink channels from a base station; and
a processor for processing the downlink channels,
wherein the reception module receives a control format indicator channel from the base station in a subframe comprising a plurality of symbols and receive at least one of a first control channel or a second control channel in the subframe from the base station, and
wherein a starting symbol of the first control channel is a first symbol of the plurality of symbols,
wherein the processor determines a starting symbol of the second control channel according to information included in the control format indicator channel or a Radio Resource Control (RRC) layer signaling, and
wherein:
if a parameter on the starting symbol of the second control channel is configured via the RRC layer signaling, the processor determines the starting symbol of the second control channel based on the parameter,
otherwise, the processor determines the starting symbol of the second control channel based on the information included in the control format indicator channel.
6. The user equipment according to claim 5 , wherein information included in the control format indicator channel indicates both the starting symbol of the second control channel and an ending symbol of the first control channel.
7. The user equipment according to claim 5 , wherein information included in the control format indicator channel includes information on frequency resources for the second control channel.
8. The user equipment according to claim 5 , wherein information included in the control format indicator channel includes information indicating whether the first control channel exists or not in the subframe.