Method for performing OTDOA-related operation in wireless communication system

1. A method of performing operation related to an observed time difference of arrival (OTDOA) in a wireless communication system, the method performed by a base station and comprising:

applying at least two precodings, for beamforming in a corresponding at least two different directions, to a Positioning Reference Signal (PRS) positioning occasion, the PRS positioning occasion including a plurality of positioning subframes;

transmitting, to a user equipment, a positioning reference signal (PRS) through the PRS positioning occasion to which the at least two precodings are applied;

receiving, from the user equipment,

OTDOA signal measurement information that is based on the PRS, and

information on a measurement quality associated with the precoding;

estimating a direction in which the user equipment is located based on the information on the measurement quality;

determining a position of the user equipment based on the OTDOA signal measurement information and the estimated direction; and

transmitting a signal related to a location-based service to the user equipment,

wherein the location-based service is a service utilizing the determined position of the user equipment.

2. The method of claim 1 , wherein the OTDOA signal measurement information is based on a reference signal time difference (RSTD) measurement.

3. The method of claim 1 , wherein estimating the direction comprises:

beamforming in accordance with a precoding among the at least two precodings having a highest measurement quality.

4. The method of claim 1 , wherein each of the at least two precodings forms different vertical beams for the user equipment.

5. The method of claim 1 ,

wherein the plurality of positioning subframes comprises two or more consecutive positioning subframes, and

wherein one of the at least two precodings is applied to each of the two or more consecutive positioning subframes.

6. The method of claim 5 , wherein an average of measurement results in the two or more consecutive positioning subframes where different precodings among the at least two precodings are applied is not allowed.

7. A method of performing operation related to an observed time difference of arrival (OTDOA) in a wireless communication system, the method performed by a user equipment and comprising:

receiving a positioning reference signal (PRS) on a PRS positioning occasion to which at least two precodings for beamforming in a corresponding at least two different directions are applied;

transmitting, to a base station,

an OTDOA signal measurement information that is based on the PRS, and

information on the measurement quality associated with the precoding; and

receiving a signal related to a location-based service from the base station,

wherein the information on the measurement quality provides information to the base station for estimating a direction in which the user equipment is located,

wherein the estimated position and the OTDOA signal measurement provides information to the base station for estimating a position of the user equipment,

wherein the location-based service is a service utilizing a position of the user equipment, and

wherein the position of the user equipment is determined by the base station based on the OTDOA signal measurement information and the information on the measurement quality.

8. The method of claim 7 , wherein the OTDOA signal measurement information is based on a reference signal time difference (RSTD) measurement.

9. The method of claim 7 , wherein the direction is estimated by the base station by beamforming in accordance with a precoding among the at least two precodings having a highest measurement quality.

10. The method of claim 7 , wherein each of the at least two precodings forms different vertical beams for the user equipment.

11. The method of claim 7 ,

wherein the plurality of positioning subframes comprises two or more consecutive positioning subframes, and

wherein one of the at least two precodings is applied to each of the two or more consecutive positioning subframes.

12. The method of claim 11 , wherein the user equipment does not calculate an average of measurement results in the two or more consecutive positioning subframes where different precodings among the at least two precodings are applied.

13. A user equipment configured to perform an operation related to an observed time difference of arrival (OTDOA) in a wireless communication system, the user equipment comprising:

an antenna;

a transceiver; and

a processor operatively connected to the transceiver and configured to:

receive a positioning reference signal (PRS) on a PRS positioning occasion to which at least two precodings for beamforming in a corresponding at least two different directions are applied;

transmit, to a base station, an OTDOA signal measurement information that is based on the PRS and information on the measurement quality associated with the precoding; and

receive a signal related to a location-based service from the base station,

wherein the information on the measurement quality provides information to the base station for estimating a direction in which the user equipment is located,

wherein the estimated position and the OTDOA signal measurement provides information to the base station for estimating a position of the user equipment,

wherein the location-based service is a service utilizing a position of the user equipment, and

wherein the position of the user equipment is determined by the base station based on the OTDOA signal measurement information and the information on the measurement quality.