Frequency difference of arrival-based positioning

Patent metadata

Field	Value
Publication number	US-2025227659-A1
Application number	US-202318855414-A
Country	US
Kind code	A1
Filing date	Mar 29, 2023
Priority date	May 30, 2022
Publication date	Jul 10, 2025
Grant date	—

Abstract

Disclosed are techniques for wireless positioning. In an aspect, a user equipment (UE) receives, from a location server, assistance data for a positioning procedure, obtains a frequency offset measurement of one or more positioning reference signal (PRS) resources transmitted by at least one transmission-reception point (TRP) based on the assistance data, and enables a location of the UE to be determined based, at least in part, on the frequency offset measurement.

First claim

What is claimed is:

1 . A method of wireless positioning performed by a user equipment (UE), comprising:
receiving assistance data for a positioning procedure; obtaining a frequency offset measurement of one or more positioning reference signal (PRS) resources transmitted by at least one transmission-reception point (TRP) based on the assistance data; and enabling a location of the UE to be determined based, at least in part, on the frequency offset measurement.

2 . The method of claim 1 , wherein the frequency offset measurement is based on a first phase measurement of a first symbol of the one or more PRS resources, a second phase measurement of a second symbol of the one or more PRS resources, and a difference in time between the first symbol and the second symbol.

3 . The method of claim 2 , wherein the first symbol and the second symbol have the same allocation of PRS resource elements of the one or more PRS resources.

4 . The method of claim 2 , wherein:
the first symbol and the second symbol are within the same slot, and the difference in time indicates a number of symbols between the first symbol and the second symbol.

5 . The method of claim 4 , wherein:
the one or more PRS resources are a single PRS resource, the single PRS resource comprises at least two repetitions of a comb pattern of the single PRS resource, and the at least two repetitions of the comb pattern are separated by the difference in time.

6 . The method of claim 2 , wherein:
the first symbol and the second symbol are in different slots, and the difference in time indicates a number of slots between the different slots.

7 . The method of claim 6 , wherein the one or more PRS resources in the different slots have the same comb pattern.

8 . The method of claim 2 , wherein:
the first symbol and the second symbol belong to the same PRS resource of the one or more PRS resources.

9 . The method of claim 2 , wherein:
the first symbol belongs to a first PRS resource of the one or more PRS resources, and the second symbol belongs to a second PRS resource of the one or more PRS resources different than the first PRS resource.

10 . The method of claim 9 , wherein the assistance data indicates that the first PRS resource and the second PRS resource are configured to be transmitted by the at least one TRP with phase coherence.

11 . The method of claim 2 , further comprising:
transmitting, to a location server, a capability message indicating a capability of the UE to obtain the first phase measurement and the second phase measurement from the same PRS resource of the one or more PRS resources or to obtain the first phase measurement and the second phase measurement from different PRS resources of the one or more PRS resources.

12 . The method of claim 2 , wherein:
the first phase measurement is a first phase of a first linear average of a first channel response of a first path delay of PRS resource elements of the first symbol of the one or more PRS resources, and the second phase measurement is a second phase of a second linear average of a second channel response of a second path delay of PRS resource elements of the second symbol of the one or more PRS resources.

13 . The method of claim 2 , wherein the assistance data includes an index of the first symbol, an index of the second symbol, and the difference in time.

14 . The method of claim 1 , further comprising:
transmitting, to a location server, a capability message indicating a capability of the UE to engage in a frequency difference of arrival (FDOA) positioning procedure, to report the frequency offset measurement, or both.

15 . The method of claim 1 , wherein the positioning procedure is an FDOA positioning procedure.

16 . The method of claim 1 , wherein enabling the location of the UE to be determined comprises:
reporting the frequency offset measurement to a location server to enable the location server to determine the location of the UE.

17 . The method of claim 16 , wherein:
the positioning procedure is a time-difference of arrival (TDOA) positioning procedure, and the frequency offset measurement is reported to the location server as part of the TDOA positioning procedure.

18 . The method of claim 16 , wherein reporting the frequency offset measurement comprises:
reporting a first frequency offset measurement of a first dominant path of the one or more PRS resources; and reporting one or more second frequency offset measurements of one or more additional paths of the one or more PRS resources.

19 . The method of claim 18 , further comprising:
transmitting, to the location server, a capability message indicating a capability of the UE to report the one or more second frequency offset measurements.

20 . The method of claim 1 , wherein enabling the location of the UE to be determined comprises:
determining the location of the UE based on the frequency offset measurement and ephemeris information for the at least one TRP.

21 . The method of claim 1 , wherein the one or more PRS resources are one or more narrowband PRS resources.

22 . The method of claim 21 , further comprising:
transmitting, to a location server, a capability message indicating a capability of the UE to obtain the frequency offset measurement based on the one or more narrowband PRS resources.

23 . The method of claim 1 , wherein the frequency offset measurement is reported:
as a normalized value without units, in units of parts-per-million (ppm), in units of velocity, in units of frequency, or as a difference between an actual frequency offset measurement obtained by the UE and an expected frequency offset measurement received in the assistance data.

24 . The method of claim 1 , wherein the assistance data includes a range and resolution for reporting the frequency offset measurement per TRP, component carrier, frequency band, or frequency layer.

25 . The method of claim 1 , wherein:
the assistance data includes a range and resolution for reporting the frequency offset measurement per TRP in ppm units, and the UE translates the range and resolution to a range and resolution per component carrier, frequency band, or frequency layer.

26 . The method of claim 1 , further comprising:
determining a range and resolution of the frequency offset measurement based on an orbit of the at least one TRP.

27 . The method of claim 1 , wherein the assistance data is received from:
a location server in one or more Long-Term Evolution (LTE) positioning protocol (LPP) messages, or a base station in one or more positioning system information blocks (posSIBs) broadcasted by the base station.

28 . The method of claim 1 , wherein the at least one TRP comprises at least one space vehicle.

29 . A method of positioning performed by a network entity, comprising:
transmitting, to a user equipment (UE), assistance data for a positioning procedure; receiving, from the UE, a frequency offset measurement of one or more positioning reference signal (PRS) resources transmitted by at least one transmission-reception point (TRP); and determining a location of the UE based, at least in part, on the frequency offset measurement.

30 . The method of claim 29 , wherein the frequency offset measurement is based on a first phase measurem

Assignees

• Qualcomm Inc

Inventors

• Saha Chiranjib
• Krishnamurthy Harikumar
• Rico Alvarino Alberto
• Manolakos Alexandros
• Park Changhwan

Classifications

• G01S5/10

  Position of receiver fixed by co-ordinating a plurality of position lines defined by path-difference measurements {, e.g. omega or decca systems}(G01S5/12 takes precedence {; beacons and receivers cooperating therewith G01S1/306, G01S1/308}) · CPC title

• G01S5/0236

  Assistance data, e.g. base station almanac · CPC title

• G01S5/0036

  of measured values, i.e. measurement on mobile and position calculation on base station · CPC title

• G01S5/0246

  involving frequency difference of arrival or Doppler measurements (G01S5/02685 takes precedence) · CPC title

• H04W8/24

  Transfer of terminal data · CPC title