Determining timing resolution and range of reported timing measurements used for position estimation
Disclosed are techniques for determining a timing resolution and a range of reported timing measurements used for position estimation. For example, in various embodiments, a user equipment (UE) may receive positioning beacons from multiple network nodes (e.g., different base stations, distant transmission points belonging to one base station, etc.), measure an observed time difference of arrival (OTDOA) between the received positioning beacons, and quantize the measured OTDOA according to a timing resolution and/or a range that depend at least in part on one or more signal parameters associated with the received positioning beacons. Accordingly, the UE may then transmit a report containing the quantized OTDOA to a network entity, which may correspond to one or more of the network nodes from which the positioning beacons were received (e.g., a serving base station) or a location server.
1. A method for determining a timing resolution and range of reported timing measurements, comprising:
receiving positioning beacons from multiple network nodes at a user equipment (UE), wherein the received positioning beacons include at least a first positioning beacon received from a first network node and a second positioning beacon received from a second network node;
measuring an observed time difference of arrival (OTDOA) between the first positioning beacon and the second positioning beacon;
determining one or more parameters associated with the first positioning beacon and the second positioning beacon;
determining, subsequent to receiving the first and second positioning beacons, a timing resolution and a range for quantization of the measured OTDOA based on the one or more parameters associated with the first positioning beacon and the second positioning beacon;
quantizing, subsequent to determining the timing resolution and the range, the measured OTDOA according to the timing resolution and the range to generate a corresponding quantized OTDOA value that is encoded using a corresponding number of bits based on the timing resolution and the range; and
transmitting a report containing the quantized OTDOA to a network entity.
2. The method recited in claim 1 , wherein the timing resolution comprises a step size between consecutive reportable OTDOA values.
3. The method recited in claim 1 , wherein the range comprises a span between a maximum reportable OTDOA value and a minimum reportable OTDOA value.
4. The method recited in claim 1 , wherein the one or more signal parameters comprise a positioning beacon bandwidth, and wherein the timing resolution increases proportionally with the positioning beacon bandwidth.
5. The method recited in claim 4 , wherein the one or more signal parameters further comprise a resource mapping or density of occupied subcarriers in a frequency domain, and wherein the range shrinks with increasing spacing between subcarriers.
6. The method recited in claim 1 , wherein the one or more signal parameters comprise a carrier bandwidth associated with a cell or bandwidth-part in which one or more of the first positioning beacon or the second positioning beacon are received.
7. The method recited in claim 1 , wherein the one or more signal parameters comprise a subcarrier spacing of a waveform associated with one or more of the first positioning beacon or the second positioning beacon.
8. The method recited in claim 1 , wherein the one or more signal parameters comprise a subcarrier spacing associated with a cell or bandwidth-part in which one or more of the first positioning beacon or the second positioning beacon are received.
9. The method recited in claim 1 , wherein the first network node and the second network node comprise two different base stations.
10. The method recited in claim 1 , wherein the first network node and the second network node are the same base station.
11. The method recited in claim 10 , wherein the first network node and the second network node comprise two transmission points belonging to the same base station.
12. The method recited in claim 1 , wherein the positioning beacons comprise one or more of Positioning Reference Signals (PRS), Cell-specific Reference Signals (CRS), Channel State Information Reference Signals (CSI-RS), or synchronization signals.
13. The method recited in claim 1 , wherein the network entity is a serving base station that corresponds to one or more of the multiple network nodes from which the positioning beacons were received.
14. The method recited in claim 1 , wherein the network entity is a location server in communication with the UE.
15. The method of claim 1 , wherein, if the at least the first positioning beacon and the second positioning beacon have different associated signal parameters, the timing resolution and the range are determined based on a joint set of signal parameters.
16. An apparatus, comprising:
a receiver configured to receive positioning beacons from multiple network nodes, wherein the received positioning beacons include at least a first positioning beacon received from a first network node and a second positioning beacon received from a second network node;
one or more processors configured to:
measure an observed time difference of arrival (OTDOA) between the first positioning beacon and the second positioning beacon;
determine one or more parameters associated with the first positioning beacon and the second positioning beacon;
determine, subsequent to receiving the first and second positioning beacons, a timing resolution and a range for quantization of the measured OTDOA based on the one or more parameters associated with the first positioning beacon and the second positioning beacon; and
quantize, subsequent to determining the timing resolution and the range, the measured OTDOA according to the timing resolution and the range to generate a corresponding quantized OTDOA value that is encoded using a corresponding number of bits based on the timing resolution and the range; and
a transmitter configured to transmit a report containing the quantized OTDOA to a network entity.
17. The apparatus recited in claim 16 , wherein the timing resolution comprises a step size between consecutive reportable OTDOA values.
18. The apparatus recited in claim 16 , wherein the range comprises a span between a maximum reportable OTDOA value and a minimum reportable OTDOA value.
19. The apparatus recited in claim 16 , wherein the one or more signal parameters comprise a positioning beacon bandwidth, and wherein the timing resolution increases proportionally with the positioning beacon bandwidth.
20. The apparatus recited in claim 19 , wherein the one or more signal parameters further comprise a resource mapping or density of occupied subcarriers in a frequency domain, and wherein the range shrinks with increasing spacing between subcarriers.
21. The apparatus recited in claim 16 , wherein the one or more signal parameters comprise a carrier bandwidth associated with a cell or bandwidth-part in which one or more of the first positioning beacon or the second positioning beacon are received.
22. The apparatus recited in claim 16 , wherein the one or more signal parameters comprise a subcarrier spacing of a waveform associated with one or more of the first positioning beacon or the second positioning beacon.
23. The apparatus recited in claim 16 , wherein the one or more signal parameters comprise a subcarrier spacing associated with a cell or bandwidth-part in which one or more of the first positioning beacon or the second positioning beacon are received.
24. The apparatus recited in claim 16 , wherein the first network node and the second network node comprise two different base stations.
25. The apparatus recited in claim 16 , wherein the first network node and the second network node are the same base station.
26. The apparatus recited in claim 25 , wherein the first network node and the second network node comprise two transmission points belonging to the same base station.
27. The apparatus recited in claim 16 , wherein the positioning beacons comprise one or more of Positioning Reference Signals (PRS), Cell-specific Reference Signals (CRS), Channel State Information Reference Signals (CSI-RS), or synchronization signals.
28. The apparatus recited in claim 16 , wherein the network entity is a serving base station that corresponds to one or more of the multiple network nodes from which the positioning beacons were received.
29. An apparatus, comprising:
means for receiving positioning beacons from multiple network nodes at a user equipment (UE), wherein the received positioning beacons include at least a first positioning beacon received from a first network node and a second positioning beacon received from a second network node;
means for measuring an observed time difference of arrival (OTDOA) between the first positioning beacon and the second positioning beacon;
means for determining one or more parameters associated with the first positioning beacon and the second positioning beacon;
means for determining, subsequent to receiving the first and second positioning beacons, a timing resolution and a range for quantization of the measured OTDOA based on the one or more parameters associated with the first positioning beacon and the second positioning beacon;
means for quantizing, subsequent to determining the timing resolution and the range, the measured OTDOA according to the timing resolution and the range to generate a corresponding quantized OTDOA value that is encoded using a corresponding number of bits based on the timing resolution and the range; and
means for transmitting a report containing the quantized OTDOA to a network entity.
30. A non-transitory computer-readable storage medium having computer-executable instructions recorded thereon, the computer-executable instructions configured to cause a device having one or more processors to:
receive positioning beacons from multiple network nodes at a user equipment (UE), wherein the received positioning beacons include at least a first positioning beacon received from a first network node and a second positioning beacon received from a second network node;
measure an observed time difference of arrival (OTDOA) between the first positioning beacon and the second positioning beacon;
determine one or more parameters associated with the first positioning beacon and the second positioning beacon;
determine, subsequent to receiving the first and second positioning beacons, a timing resolution and a range for quantization of the measured OTDOA based on the one or more parameters associated with the first positioning beacon and the second positioning beacon;
quantize, subsequent to determining the timing resolution and the range, the measured OTDOA according to the timing resolution and the range to generate a corresponding quantized OTDOA value that is encoded using a corresponding number of bits based on the timing resolution and the range; and
transmit a report containing the quantized OTDOA to a network entity.