Method and base station for transmitting downlink signal and method and equipment for receiving downlink signal

A user equipment for performing channel measurement, the user equipment comprising:

• a receiver, and
• a processor configured to:
• control the receiver to receive zero power CSI-RS information indicating one or more zero power CSI-RS resources for a cell;
• perform the channel measurement based on the zero power CSI-RS information;
• and
• presume that no downlink data is mapped to the one or more zero power CSI-RS resources,
• wherein the zero power CSI-RS information includes a bitmap having bits corresponding respectively to CSI-RS resources defined for a fixed number of antenna ports, regardless of a number of antenna ports used in the cell, among a plurality of CSI-RS resources defined according to numbers of antenna ports, and
• wherein the fixed number is greater than two.

A method for receiving, by a base station, a channel measurement report, the method comprising:

• transmitting, by the base station, zero power CSI-RS information indicating one or more zero power CSI-RS resources for a cell;
• and
• transmitting, by the base station, the one or more zero power CSI-RS resources at zero power based on the zero power CSI-RS information,
• wherein the zero power CSI-RS information includes a bitmap having bits corresponding respectively to CSI-RS resources defined for a fixed number of antenna ports, regardless of a number of antenna ports used in the cell, among a plurality of CSI-RS resources defined according to numbers of antenna ports, and
• wherein the fixed number is greater than two.

A base station for receiving a channel measurement report, the base station comprising:

• a transmitter,
• a receiver, and
• a processor configured to:
• control the transmitter and the receiver;
• control the transmitter to transmit zero power CSI-RS information indicating one or more zero power CSI-RS resources for a cell;
• and
• control the transmitter to transmit the one or more zero power CSI-RS resources at zero power based on the zero power CSI-RS information,
• wherein the zero power CSI-RS information includes a bitmap having bits corresponding respectively to CSI-RS resources defined for a fixed number of antenna ports, regardless of a number of antenna ports used in the cell, among a plurality of CSI-RS resources defined according to numbers of antenna ports, and
• wherein the fixed number is greater than two.