Method for receiving reference signal and user equipment, and method for transmitting reference signal and base station

A user equipment for receiving channel state information reference signals (CSI-RSs), the user equipment comprising:

• a radio frequency (RF) unit configured to transmit or receive a radio signal;
• and
• a processor configured to:
• control the RF unit to receive multiple configurations and power information for each of the multiple configurations;
• control the RF unit to receive the CSI-RSs corresponding to the multiple configurations;
• and
• derive channel state information based on the power information and the CSI-RSs,
• wherein the multiple configurations are different at least in CSI-RS configurations, in CSI-RS subframe configurations of in CSI-RS port indexes, and
• wherein for at least one configuration among the multiple configurations, the power information includes a first ratio of downlink data transmit power to reference signal transmit power for a first subframe set associated with the at least one configuration and a second ratio of downlink data transmit power to reference signal transmit power associated with the at least one configuration.

A method for transmitting channel state information reference signals (CSI-RSs) at a base station, the method comprising:

• transmitting, by the base station, multiple configurations and power information for each of the multiple configurations to a user equipment;
• transmitting, by the base station, the CSI-RSs according to the multiple configurations and the power information;
• and
• receiving channel state information for the multiple configurations from the user equipment,
• wherein the multiple configurations are different at least in CSI-Rs configurations, in CSI-Rs subframe configurations or in CSI-RS port indexes, and
• wherein, for at least one configuration among the multiple configurations, the power information includes a first ratio of downlink data transmit power to reference signal transmit power for a first subframe set associated with the at least one configuration and a second ratio of downlink data transmit power to reference signal transmit power associated with the at least one configuration.

A base station for transmitting channel state information reference signals (CSI-RSs), the base station comprising:

• a radio frequency (RF) unit configured to transmit or receive a radio signal, and
• a processor configured to:
• control the RF unit to control the RF unit to transmit multiple configurations and power information for each of the multiple configurations to a user equipment;
• control the RF unit to transmit the CSI-RSs according to the multiple configurations and the power information;
• and
• control the RF unit to receive channel state information for the multiple configuration from the user equipment,
• wherein the multiple configurations are different at least in CSI-RS configurations, in CSI-RS subframe configurations or in CSI-Rs port indexes, and
• wherein, for at least one configuration among the multiple configurations, the power information includes a first ratio of downlink data transmit power to reference signal transmit power for a first subframe set associated with the at least one configuration and a second ratio of downlink data transmit power to reference signal transmit power associated with the at least one configuration.