Method and apparatus for receiving downlink radio signal

1. A method of a receiving a downlink signal from a base station including a two-dimensional (2D) antenna array consists of a plurality of antenna elements in a wireless communication system, the method comprising:

receiving a reference signal allocated to at least one column-direction antenna array of the 2D antenna array;

receiving information about a semi-static beam candidate set consists of at least one semi-static beam applicable to the at least one column-direction antenna array; and

measuring an average channel state for semi-static beamforming using the received reference signal and the information about the semi-static candidate set,

wherein the 2D antenna array is virtualized to a one-dimensional (1D) antenna array supporting dynamic beamforming by applying at least one semi-static beam of the semi-static beam candidate set to the column-direction antenna array.

2. The method according to claim 1 , wherein the measuring the channel state includes determining a semi-static beam for enabling the reference signal to be received with maximum received power, from among the semi-static beam candidate set.

3. The method according to claim 2 , further comprising:

transmitting information about the determined semi-static beam to the base station.

4. The method according to claim 2 , wherein the information about the determined semi-static beam includes a size of each element of a vector corresponding to the determined semi-static beam and/or a relative phase difference between elements.

5. The method according to claim 1 , wherein each semi-static beam of the semi-static beam candidate set corresponds to one of vertical sectors served by the base station.

6. The method according to claim 1 , further comprising:

receiving information indicating that the reference signal is for semi-static beamforming.

7. The method according to claim 1 , wherein the semi-static beam is associated with reference signal resources for dynamic beamforming.

8. The method according to claim 1 , further comprising:

if the semi-static beam is changed, receiving information indicating the change.

9. The method according to claim 8 , further comprising:

receiving a predetermined reference signal allocated to the at least one column-direction antenna array, to which a fixed semi-static beam is applied, until reconfiguration is completed using the changed semi-static beam.

10. The method according to claim 9 , further comprising:

receiving power information for transmitting the downlink signal to be used until reconfiguration is completed using the changed semi-static beam.

11. A user equipment (UE) configured to receive a downlink signal from a base station including a two-dimensional antenna array consists of a plurality of antenna elements in a wireless communication system, the UE comprising:

a radio frequency (RF) unit; and

a processor configured to control the RF unit,

wherein the processor is configured to receive a reference signal allocated to at least one column-direction antenna array of the 2D antenna array, to receive information about a semi-static beam candidate set consists of at least one semi-static beam applicable to the antenna array of the at least one column direction, and to measure an average channel state for semi-static beamforming using the received reference signal and the information about the semi-static candidate set, and

wherein the 2D antenna array is virtualized to a one-dimensional (1D) antenna array supporting dynamic beamforming by applying at least one semi-static beam of the semi-static beam candidate set to the column-direction antenna array.