Downlink signal reception method, user equipment, downlink signal transmission method and base station

A user equipment (UE) for receiving a downlink signal, the UE comprising:

• a radio frequency (RF) transceiver;
• and
• a processor connected to the RF transceiver,
• wherein the processor is configured to:
• control the RF transceiver to receive UE-specific signals (UE-RSs) for antenna ports p0 to pN−1 within a transmission time interval (TTI);
• and
• control the RF transceiver to receive, in one of a plurality of short TTIs (sTTIs) configured in the TTI, a first downlink control channel and a first downlink data channel corresponding to the first downlink control channel, based on the UE-RSs, and
• wherein the first downlink data channel is received based on the antenna ports p0 to pN−1, and
• wherein the first downlink control channel is received through L antenna ports with L highest antenna port indexes among the antenna ports p0 to pN−1, where N is an integer larger than 1, and L is a positive integer smaller than N.

A method for transmitting a downlink signal by a base station (BS), the method comprising:

• transmitting, to a user equipment (UE), UE-specific reference signals (UE-RSs) for antenna ports p0 to pN−1 within a transmission time interval (TTI);
• and
• transmitting, in one of a plurality of short TTIs (sTTIs) configured in the TTI, a first downlink control channel and a first downlink data channel corresponding to the first downlink control channel, based on the UE-RSs,
• wherein the first downlink data channel is transmitted based on the antenna ports p0 to pN−1, and
• wherein the first downlink control channel is transmitted through L antenna ports with L highest antenna port indexes among the antenna ports p0 to pN−1, where N is an integer larger than 1, and L is a positive integer smaller than N.

A base station (B S) for transmitting a downlink signal, the B S comprising:

• a radio frequency (RF) transceiver;
• and
• a processor connected to the RF transceiver,
• wherein the processor is configured to:
• control the RF transceiver to transmit, to a user equipment (UE), UE-specific reference signals (UE-RSs) for antenna ports p0 to pN−1 within a transmission time interval (TTI);
• and
• control the RF transceiver to transmit, in one of a plurality of short TTIs (sTTIs) configured in the TTI, a first downlink control channel and a first downlink data channel corresponding to the first downlink control channel, based on the UE-RSs, and
• wherein the first downlink data channel is transmitted based on the antenna ports p0 to pN−1, and
• wherein the first downlink control channel is transmitted through L antenna ports with L highest antenna port indexes among the antenna ports p0 to pN−1, where N is an integer larger than 1, and L is a positive integer smaller than N.