Method for performing positioning in wireless communication system and device therefor

1. A method for performing positioning, by a user equipment (UE), in a wireless communication system, the method comprising:

receiving, from a serving base station (BS), an assistance data including reference cell information and neighbor cell information,

wherein the reference cell information and the neighbor cell information include channel state information-reference signal (CSI-RS) configuration information for measurement related to CSI-RS-based positioning;

receiving a CSI-RS from each of a reference cell and at least one neighbor cell based on the received assistance data;

measuring a reference signal time difference (RSTD) regarding the reference cell of the at least one neighbor cell using the received CSI-RS; and

reporting, to the serving BS, the measured RSTD,

wherein the CSI-RS configuration information includes at least one of a CSI-RS bandwidth field, an antenna port count field, a resource configuration field, a subframe configuration field, a scrambling identity field or a quasi co-location (QCL) CRS Info field.

2. The method of claim 1 , wherein a sequence of the CSI-RS is scrambled by an independent virtual cell ID (VCI).

3. The method of claim 1 , further comprising:

receiving, from the serving BS, indication information indicating whether the CSI-RS is used for CSI feedback or used for positioning-related measurement.

4. The method of claim 1 , wherein when the QCL CRS Info field is included in the CSI-RS configuration information, the RSTD us measured in consideration of a common reference signal (CRS) and a QCL assumption.

5. The method of claim 1 , wherein the CSI-RS configuration information is received by each transmission point (TPs), and each TP is included in a specific cell.

6. The method of claim 1 , wherein the CSI-RS configuration information is included in a CSI-RS Info information element (IE).

7. The method of claim 1 , wherein the assistance data further includes positioning reference signal (PRS) configuration information for measurement related to PRS-based positioning, and

the method further comprising:

receiving a PRS from each of the reference cell and the at least one neighbor cell on the basis of the received PRS configuration information.

8. The method of claim 7 , wherein when the PRS and the CSI-RS collide with each other, transmission of the CSI-RS is dropped.

9. The method of claim 8 , wherein the CSI-RS of the dropped transmission is a CSI-RS for measurement related to positioning.

10. The method of claim 8 , wherein transmission of the CSI-RS is dropped only in a subframe in which a collision has occurred.

11. The method of claim 7 , wherein when the PRS and the CSI-RS collide with each other, transmission of the PRS is dropped in a subframe in which the collision has occurred.

12. A user equipment (UE) for performing positioning in a wireless communication system, the UE comprising:

one or more antennas configured to transmit and receive a radio signal; and

a processor configured to:

receive, from a serving base station (BS), an assistance data including reference cell information and neighbor cell information,

wherein the reference cell information and the neighbor cell information include channel state information-reference signal (CSI-RS) configuration information for measurement related to CSI-RS-based positioning;

receive a CSI-RS from each of a reference cell and at least one neighbor cell based on the received assistance data,

measure a reference signal time difference (RSTD) regarding the reference cell of the at least one neighbor cell using the received CSI-RS, and

report, to the serving BS, the measured RSTD,

wherein the CSI-RS configuration information includes at least one of a CSI-RS bandwidth field, an antenna port count field, a resource configuration field, a subframe configuration field, a scrambling identity field or a quasi co-location (QCL) CRS Info field.