Reporting the number of samples and positioning reference signal (PRS) instances associated with a positioning measurement
Disclosed are techniques for wireless positioning. In an aspect, a network node receives assistance data from a location server, the assistance data including at least a configuration of at least a first number of samples of a plurality of instances of a positioning reference signal (PRS) resource of a PRS resource set to use to determine at least one positioning measurement of the PRS resource for a positioning session, performs the at least one positioning measurement using a second number of samples of the plurality of instances of the PRS resource, and transmits a measurement report to the location server, the measurement report including at least the at least one positioning measurement and the second number of samples.
1 . A method of wireless positioning performed by a network node, comprising:
receiving assistance data from a location server, the assistance data including at least a configuration of at least a first number of samples of a plurality of instances of a positioning reference signal (PRS) resource of a PRS resource set to use to determine at least one positioning measurement of the PRS resource for a positioning session;
performing the at least one positioning measurement using a second number of samples of the plurality of instances of the PRS resource; and
transmitting a measurement report to the location server, the measurement report including at least the at least one positioning measurement, a timestamp associated with the at least one positioning measurement, and at least one bit indicating whether the timestamp corresponds to a last sample of the second number of samples or a first sample of the second number of samples.
2 . The method of claim 1 , wherein the first number of samples comprises a maximum number of samples, a minimum number of samples, or both.
3 . The method of claim 1 , wherein the second number of samples is reported as:
an actual number of samples used to determine the at least one positioning measurement,
a number of samples of the PRS resource set,
a number of samples of the PRS resource,
a number of samples of a transmission-reception point (TRP) transmitting the PRS resource set, or
a number of samples of a positioning frequency layer containing the PRS resource set.
4 . The method of claim 1 , wherein the second number of samples is reported as:
a representative number of samples of the PRS resource set,
a representative number of samples of the PRS resource,
a representative number of samples of a TRP transmitting the PRS resource set, or
a representative number of samples of a positioning frequency layer containing the PRS resource set.
5 . The method of claim 4 , wherein:
the representative number of samples of the PRS resource set is a minimum or maximum number of samples of the PRS resource set,
the representative number of samples of the PRS resource is a minimum or maximum number of samples of the PRS resource,
the representative number of samples of the TRP is a minimum or maximum number of samples of the TRP, or
the representative number of samples of the positioning frequency layer is a minimum or maximum number of samples of the positioning frequency layer.
6 . The method of claim 1 , wherein the measurement report further includes:
a field indicating a location of the second number of samples among the plurality of instances with respect to the timestamp.
7 . The method of claim 6 , wherein:
the field indicates that the second number of samples are samples of the plurality of instances taken before the timestamp;
the field indicates that the second number of samples are samples of the plurality of instances taken after the timestamp; or
the field indicates that the second number of samples are samples of the plurality of instances taken around the timestamp.
8 . The method of claim 6 , wherein the field is associated with:
the at least one positioning measurement,
the PRS resource,
the PRS resource set,
a TRP transmitting the PRS resource set,
a positioning frequency layer containing the PRS resource set, or
the measurement report.
9 . The method of claim 1 , wherein:
the assistance data including the configuration of at least the first number of samples comprises the assistance data including a configuration of at least the first number of samples and a third number of samples, and
the assistance data further includes at least one threshold for a metric to configure the network node to use the first number of samples or the third number of samples.
10 . The method of claim 9 , wherein the metric comprises:
a signal-to-noise ratio (SNR) measurement of the PRS resource,
a reference signal received power (RSRP) measurement of the PRS resource,
a number of TRPs detected by the network node,
a number of PRS resources detected by the network node,
a line-of-sight (LOS) or non-line-of-sight (NLOS) flag, or
a mobility flag.
11 . The method of claim 9 , wherein, based on a value of the metric being below the threshold, the network node is expected to use the first number of samples.
12 . The method of claim 9 , wherein, based on a value of the metric being above the threshold, the network node is expected to use the third number of samples.
13 . The method of claim 1 , wherein:
the network node is a user equipment (UE),
the assistance data is a Long-Term Evolution (LTE) positioning protocol (LPP) assistance data message,
the measurement report is an LPP measurement report message, and
the PRS resource is a downlink PRS resource transmitted by a TRP.
14 . The method of claim 1 , wherein:
the network node is a base station,
the assistance data is a New Radio positioning protocol type A (NRPPa) assistance data message,
the measurement report is an NRPPa measurement report message, and
the PRS resource is a sounding reference signal (SRS) transmitted by a UE.
15 . The method of claim 1 , wherein:
the network node is a first UE,
the assistance data is a Long-Term Evolution (LTE) positioning protocol (LPP) assistance data message,
the measurement report is an LPP measurement report message, and
the PRS resource is a sidelink PRS resource transmitted by a second UE.
16 . A network node, comprising:
one or more memories;
one or more transceivers; and
one or more processors communicatively coupled to the one or more memories and the one or more transceivers, the one or more processors, either alone or in combination, configured to:
receive, via the one or more transceivers, assistance data from a location server, the assistance data including at least a configuration of at least a first number of samples of a plurality of instances of a positioning reference signal (PRS) resource of a PRS resource set to use to determine at least one positioning measurement of the PRS resource for a positioning session;
perform the at least one positioning measurement using a second number of samples of the plurality of instances of the PRS resource; and
transmit, via the one or more transceivers, a measurement report to the location server, the measurement report including at least the at least one positioning measurement, a timestamp associated with the at least one positioning measurement, and at least one bit indicating whether the timestamp corresponds to a last sample of the second number of samples or a first sample of the second number of samples.
17 . The network node of claim 16 , wherein the first number of samples comprises a maximum number of samples, a minimum number of samples, or both.
18 . The network node of claim 16 , wherein the second number of samples is reported as:
an actual number of samples used to determine the at least one positioning measurement,
a number of samples of the PRS resource set,
a number of samples of the PRS resource,
a number of samples of a transmission-reception point (TRP) transmitting the PRS resource set, or
a number of samples of a positioning frequency layer containing the PRS resource set.
19 . The network node of claim 16 , wherein the second number of samples is reported as:
a representative number of samples of the PRS resource set,
a representative number of samples of the PRS resource,
a representative number of samples of a TRP transmitting the PRS resource set, or
a representative number of samples of a positioning frequency layer containing the PRS resource set.
20 . The network node of claim 19 , wherein:
the representative number of samples of the PRS resource set is a minimum or maximum number of samples of the PRS resource set,
the representative number of samples of the PRS resource is a minimum or maximum number of samples of the PRS resource,
the representative number of samples of the TRP is a minimum or maximum number of samples of the TRP, or
the representative number of samples of the positioning frequency layer is a minimum or maximum number of samples of the positioning frequency layer.
21 . The network node of claim 16 , wherein the measurement report further includes:
a field indicating a location of the second number of samples among the plurality of instances with respect to the timestamp.
22 . The network node of claim 21 , wherein:
the field indicates that the second number of samples are samples of the plurality of instances taken before the timestamp;
the field indicates that the second number of samples are samples of the plurality of instances taken after the timestamp; or
the field indicates that the second number of samples are samples of the plurality of instances taken around the timestamp.
23 . The network node of claim 21 , wherein the field is associated with:
the at least one positioning measurement,
the PRS resource,
the PRS resource set,
a TRP transmitting the PRS resource set,
a positioning frequency layer containing the PRS resource set, or
the measurement report.
24 . The network node of claim 16 , wherein:
the assistance data including the configuration of at least the first number of samples comprises the assistance data including a configuration of at least the first number of samples and a third number of samples, and
the assistance data further includes at least one threshold for a metric to configure the network node to use the first number of samples or the third number of samples.
25 . The network node of claim 24 , wherein the metric comprises:
a signal-to-noise ratio (SNR) measurement of the PRS resource,
a reference signal received power (RSRP) measurement of the PRS resource,
a number of TRPs detected by the network node,
a number of PRS resources detected by the network node,
a line-of-sight (LOS) or non-line-of-sight (NLOS) flag, or
a mobility flag.
26 . The network node of claim 24 , wherein, based on a value of the metric being below the threshold, the network node is expected to use the first number of samples.
27 . The network node of claim 24 , wherein, based on a value of the metric being above the threshold, the network node is expected to use the third number of samples.
28 . The network node of claim 16 , wherein:
the network node is a user equipment (UE),
the assistance data is a Long-Term Evolution (LTE) positioning protocol (LPP) assistance data message,
the measurement report is an LPP measurement report message, and
the PRS resource is a downlink PRS resource transmitted by a TRP.
29 . The network node of claim 17 , wherein:
the network node is a base station,
the assistance data is a New Radio positioning protocol type A (NRPPa) assistance data message,
the measurement report is an NRPPa measurement report message, and
the PRS resource is a sounding reference signal (SRS) transmitted by a UE.
30 . The network node of claim 16 , wherein:
the network node is a first UE,
the assistance data is a Long-Term Evolution (LTE) positioning protocol (LPP) assistance data message,
the measurement report is an LPP measurement report message, and
the PRS resource is a sidelink PRS resource transmitted by a second UE.
31 . A network node, comprising:
means for receiving assistance data from a location server, the assistance data including at least a configuration of at least a first number of samples of a plurality of instances of a positioning reference signal (PRS) resource of a PRS resource set to use to determine at least one positioning measurement of the PRS resource for a positioning session;
means for performing the at least one positioning measurement using a second number of samples of the plurality of instances of the PRS resource; and
means for transmitting a measurement report to the location server, the measurement report including at least the at least one positioning measurement, a timestamp associated with the at least one positioning measurement, and at least one bit indicating whether the timestamp corresponds to a last sample of the second number of samples or a first sample of the second number of samples.
32 . The network node of claim 31 , wherein the first number of samples comprises a maximum number of samples, a minimum number of samples, or both.
33 . A non-transitory computer-readable medium storing computer-executable instructions that, when executed by a network node, cause the network node to:
receive assistance data from a location server, the assistance data including at least a configuration of at least a first number of samples of a plurality of instances of a positioning reference signal (PRS) resource of a PRS resource set to use to determine at least one positioning measurement of the PRS resource for a positioning session;
perform the at least one positioning measurement using a second number of samples of the plurality of instances of the PRS resource; and
transmit a measurement report to the location server, the measurement report including at least the at least one positioning measurement, a timestamp associated with the at least one positioning measurement, and at least one bit indicating whether the timestamp corresponds to a last sample of the second number of samples or a first sample of the second number of samples.