Method for transmitting and receiving control information in wireless communication system, and apparatus therefor
A method for receiving, by a terminal, control information in a wireless communication system, according to one embodiment of the present invention, comprises: receiving search space information for a self-contained subframe having all of a downlink control symbol, a data symbol, and an uplink control symbol; determining control channel candidates in the downlink control symbol of the self-contained subframe on the basis of the search space information; and searching for downlink control information of the terminal from the determined control channel candidates, wherein the determined control channel candidates constitute at least two or more search spaces on the downlink control symbol, and the terminal can search for the downlink control information assuming a transmission scheme specific to a search space to which each control channel candidate belongs.
1. A method for receiving, by a user equipment (UE), control information in a wireless communication system, the method comprising:
receiving search space information on a self-contained subframe having all of a downlink control symbol, a data symbol, and an uplink control symbol;
determining control channel candidates in the downlink control symbol of the self-contained subframe based on the search space information; and
searching for downlink control information of the UE from the determined control channel candidates,
wherein the determined control channel candidates constitute at least two search spaces on the downlink control symbol, and
wherein the UE searches for the downlink control information by assuming a transmission scheme that is specific to a search space to which each control channel candidate belongs.
2. The method according to claim 1 , wherein the transmission scheme specific to the search space is one of a transmission diversity scheme and a UE-dedicated beamforming scheme.
3. The method according to claim 1 , wherein the at least two search spaces are configured by applying different control channel element (CCE) indexing methods to one control resource set configured in the downlink control symbol.
4. The method according to claim 1 , wherein at least one of a resource mapping scheme of the downlink control information, reference signal configuration for demodulation of the downlink control information, a physical resource block (PRB) bundling size, control channel element (CCE) aggregation levels and a number of control channel candidates corresponding to each of the CCE aggregation levels is configured as a parameter specific to the search space through the search space information.
5. The method according to claim 4 ,
wherein the UE searches for the downlink control information by assuming 2-port reference signal transmission and distributed resource mapping of the downlink control information when the transmission scheme specific to the search space is a transmission diversity scheme, and
wherein the UE searches for the downlink control information by assuming 1-port reference signal transmission and localized resource mapping of the downlink control information when the transmission scheme specific to the search space is a UE-dedicated beamforming scheme.
6. The method according to claim 1 , further comprising:
selecting one of the at least two search spaces in accordance with a bandwidth supported by the UE or a type of the downlink control information to be searched by the UE.
7. The method according to claim 1 ,
wherein a total number of the control channel candidates is determined based on blind detection capacity of the UE, and
wherein the determined total number of the control channel candidates are distributed over the at least two search spaces in accordance with a size of each search space.
8. A user equipment (UE) for receiving control information in a wireless communication system, the UE comprising:
a receiver for receiving search space information on a self-contained subframe having all of a downlink control symbol, a data symbol, and an uplink control symbol; and
a processor for determining control channel candidates in the downlink control symbol of the self-contained subframe based on the search space information and searching for downlink control information of the UE from the determined control channel candidates,
wherein the determined control channel candidates constitute at least two search spaces on the downlink control symbol, and
wherein the processor searches for the downlink control information by assuming a transmission scheme that is specific to a search space to which each control channel candidate belongs.
9. A method for transmitting, by a base station, control information in a wireless communication system, the method comprising:
transmitting, to a user equipment (UE), search space information on a self-contained subframe having all of a downlink control symbol, a data symbol, and an uplink control symbol;
mapping downlink control information of the UE into one of control channel candidates indicated through the search space information; and
transmitting the downlink control information to the UE,
wherein the control channel candidates constitute at least two search spaces on the downlink control symbol, and
wherein the base station maps and transmits the downlink control information by considering a transmission scheme that is specific to a search space to which each control channel candidate belongs.
10. The method according to claim 9 , wherein the transmission scheme specific to the search space is one of a transmission diversity scheme and a UE-dedicated beamforming scheme.
11. The method according to claim 9 , wherein the at least two search spaces are configured by applying different control channel element (CCE) indexing methods to one control resource set configured in the downlink control symbol.
12. The method according to claim 9 , wherein at least one of a resource mapping scheme of the downlink control information, reference signal configuration for demodulation of the downlink control information, a physical resource block (PRB) bundling size, control channel element (CCE) aggregation levels and a number of control channel candidates corresponding to each of the CCE aggregation levels is configured as a parameter specific to the search space through the search space information.
13. The method according to claim 12 ,
wherein 2-port reference signal transmission and distributed resource mapping of the downlink control information are used when the transmission scheme specific to the search space is a transmission diversity scheme, and
wherein 1-port reference signal transmission and localized resource mapping of the downlink control information are used when the transmission scheme specific to the search space is a UE-dedicated beamforming scheme.
14. The method according to claim 9 , further comprising:
selecting one of the at least two search spaces in accordance with a bandwidth supported by the UE or a type of the downlink control information.
15. The method according to claim 9 ,
wherein a total number of the control channel candidates is determined based on blind detection capacity of the UE, and
wherein the determined total number of the control channel candidates are distributed over the at least two search spaces in accordance with a size of each search space.