RSTD measurement accuracy requirements applicability

Abstract

An apparatus and system for determining positioning measurement accuracy are described. A UE receives positioning reference signals (PRS) from a reference cell and a neighboring cell, and reference signal time difference (RSTD) measurements based on the PRS. The RSTD and other PRS measurements based on the reference and neighboring cells have RSTD and other PRS measurement accuracy requirements that depend on the bandwidth (BW), subcarrier spacing (SCS) and repetition factor of the PRS.

Claims

1. A device for a wireless access network node (RANnode), A downlink (DL) reference signal for measurement by the user equipment (UE) is transmitted to the UE. The UE receives a measurement report including a reference signal time difference (RSTD) measurement based on a first DL reference signal from a reference cell for measuring a first time to arrival (ToA) and a second DL reference signal from a neighboring cell for measuring a second ToA different from the first ToA. Based on a predetermined correspondence between the RSTD measurement accuracy and the bandwidth and subcarrier spacing of the DL reference signal, the RSTD measurement accuracy for the reference cell and the RSTD measurement accuracy for the neighboring cell are derived, and the RSTD measurement accuracy that allows for a larger error among them is selected as the RSTD measurement accuracy requirement. This determines whether the RSTD measurement value satisfies the RSTD measurement accuracy requirement. A processing circuit for configuring the RANnode as described above, A memory configured to store the aforementioned measurement report, A device that includes this.

2. The apparatus according to claim 1, wherein the reference signal is a positioning reference signal.

3. The apparatus according to claim 1 or 2, wherein the RSTD measurement accuracy requirement depends on a combination of signal parameters of the DL reference signals from the reference cell and the neighboring cell.

4. The apparatus according to claim 3, wherein the signal parameters are selected from the bandwidth (BW), subcarrier spacing (SCS), and repetition factor of the DL reference signal.

5. The apparatus according to claim 4, wherein the RSTD measurement accuracy requirement increases along with at least one of increasing BW and increasing SCS.

6. The apparatus according to claim 5, wherein the RSTD measurement accuracy requirement increases with increasing BW and increasing SCS, respectively.

7. The apparatus according to claim 4, wherein the RSTD measurement accuracy requirement depends on the frequency range of the DL reference signals from the reference and neighboring cells.

8. The apparatus according to claim 7, wherein the combination of signal parameters for each of the aforementioned reference and neighboring cells depends on the respective frequency ranges of the DL reference signals.

9. The apparatus according to claim 8, wherein the RSTD measurement accuracy requirement increases with increasing BW and increasing SCS, respectively.

10. The apparatus according to claim 1 or 2, wherein the first and second DL reference signals are transmitted in the same frequency range.

11. The apparatus according to claim 1 or 2, wherein the first and second DL reference signals are transmitted in different frequency ranges.

12. The apparatus according to claim 1, wherein the RANnode is configured to be the primary cell of the UE.

13. A device for user equipment (UE), The system receives a first downlink (DL) reference signal from a reference cell and a second DL reference signal from a neighboring cell. A first time to arrival (ToA) is measured based on the first DL reference signal, and a second time to arrival (ToA) is measured based on the second DL reference signal. Based on a predetermined correspondence between the reference signal time difference (RSTD) measurement accuracy and the bandwidth and subcarrier spacing of the DL reference signal, the RSTD measurement accuracy for the reference cell and the RSTD measurement accuracy for the neighboring cell are derived, and the RSTD measurement accuracy that allows for a larger error among them is selected as the RSTD measurement accuracy requirement. Based on the selected RSTD measurement accuracy requirements, the RSTD measurement values ​​based on the first ToA and the second ToA are determined. Send the measurement report, including the aforementioned RSTD measurement value, to the primary cell. A processing circuit for configuring the UE as described above, A memory configured to store the aforementioned measurement report, A device that includes this.

14. The apparatus according to claim 13, wherein the reference signal is a positioning reference signal.

15. The RSTD measurement accuracy requirement depends on the combination of signal parameters of the first and second DL reference signals. The apparatus according to claim 13 or 14, wherein the signal parameters include bandwidth (BW), subcarrier spacing (SCS), and repetition factor.

16. The apparatus according to claim 15, wherein the RSTD measurement accuracy requirement increases with increasing BW and increasing SCS, respectively.

17. The apparatus according to claim 15, wherein the RSTD measurement accuracy requirement depends on the frequency range of the first and second DL reference signals.

18. A computer program that causes one or more processors of a reference cell to perform an operation, wherein the operation is: To transmit a downlink (DL) reference signal for measurement by the user equipment (UE), Receiving a measurement report from the UE including a reference signal time difference (RSTD) measurement based on a first DL reference signal from a reference cell for measuring a first time to arrival (ToA) and a second DL reference signal from a neighboring cell for measuring a second ToA different from the first ToA, Based on a predetermined correspondence between the RSTD measurement accuracy and the bandwidth and subcarrier spacing of the DL reference signal, the RSTD measurement accuracy for the reference cell and the RSTD measurement accuracy for the neighboring cell are derived, and the RSTD measurement accuracy that allows for a larger error among them is selected as the RSTD measurement accuracy requirement. To determine whether the RSTD measurement value satisfies the RSTD measurement accuracy requirement, A computer program that includes [this].

19. The RSTD measurement accuracy requirement depends on the combination of signal parameters of the first DL reference signal and the second DL reference signal. The computer program according to claim 18, wherein the signal parameters include bandwidth (BW), subcarrier spacing (SCS), and repetition factor.

20. The computer program according to claim 19, wherein the RSTD measurement accuracy requirement depends on the frequency range of the first and second DL reference signals.

21. A computer-readable storage medium storing a computer program according to any one of claims 18 to 20.

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