Method for transmitting or receiving signal in a wireless communication system and apparatus therefor

A method of transmitting downlink control information to a user equipment (UE) by a base station (BS) in a wireless communication system, the method comprising:

• transmitting information about an antenna port to the UE;
• and
• transmitting a control channel carrying downlink control information of the UE based on the information about the antenna port,
• wherein the information about the antenna port indicates at least one antenna port that the UE should monitor among a plurality of antenna ports used by the BS for control channel transmission,
• wherein the BS applies a specific transmit diversity scheme to at least one antenna port indicated by the information about the antenna port,
• wherein the antenna port used to transmit the control channel of the UE is changed in every control resource set (CORESET) and the information about the antenna port includes information about a change pattern of an antenna port changed in the every CORESET, and the change pattern is determined by performing a Modulo operation for a UE identification (ID) by a number of the at least one antenna port, and
• wherein the specific transmit diversity scheme is determined based on at least one of an aggregation level of the control channel, or a localized/distributed resource mapping scheme.

A user equipment (UE) for receiving downlink control information, the UE comprising:

• a receiver;
• and
• a processor configured to control the receiver to receive information about an antenna port from a base station (BS), perform blind detection for a control channel based on the information about the antenna port, and acquire downlink control information carried by the control channel through the blind detection,
• wherein the information about the antenna port indicates at least one antenna port that the UE should monitor among a plurality of antenna ports used by the BS for control channel transmission,
• wherein the processor assumes that a specific transmit diversity scheme is applied to the at least one antenna port indicated by the information about the antenna port in performing the blind detection,
• wherein the antenna port used to transmit the control channel of the UE is changed in every control resource set (CORESET) and the information about the antenna port includes information about a change pattern of an antenna port changed in the every CORESET, and the change pattern is determined by performing a Modulo operation for a UE identification (ID) by a number of the at least one antenna port, and
• wherein the specific transmit diversity scheme is determined based on at least one of an aggregation level of the control channel, or a localized/distributed resource mapping scheme.

A base station (BS) for transmitting downlink control information, the BS comprising:

• a transmitter;
• and
• a processor configured to control the transmitter to transmit information about an antenna port to the UE and control the transmitter to transmit a control channel carrying downlink control information of the UE based on the information about the antenna port,
• wherein the information about the antenna port indicates at least one antenna port that the UE should monitor among a plurality of antenna ports used by the BS for control channel transmission,
• wherein the processor applies a specific transmit diversity scheme to at least one antenna port indicated by the information about the antenna port,
• wherein the antenna port used to transmit the control channel of the UE is changed in every control resource set (CORESET) and the information about the antenna port includes information about a change pattern of an antenna port changed in the every CORESET, and the change pattern is determined by performing a Modulo operation for a UE identification (ID) by a number of the at least one antenna port, and
• wherein the processor determines the specific transmit diversity scheme based on at least one of an aggregation level of the control channel, or a localized/distributed resource mapping scheme.