Measurement report for sidelink-assisted positioning
According to embodiments herein, the use of an SL interface in the positioning of a UE can include additional reporting from the UE or an anchor UE related to a reference signal sent via the SL interface. This information can include information regarding the received power and/or timing of the reference signal, the angle at which it was received, and orientation of a receiving UE, and various other considerations that may not be needed in a Uu interface with a base station.
1. A method of providing a positioning measurement report for determining a location of a first user equipment (UE), the method comprising:
receiving, by the first UE, a configuration indicative of a predetermined time window comprising a period of time during which a first measurement and a second measurement are to be obtained;
determining, by the first UE, one of:
a) to use a base station as a reference node, wherein determining to use the base station as the reference node is based on receiving a first indication from a location server that a second UE should not be used as the reference node; or
b) to use the second UE as the reference node, wherein determining to use the second UE as the reference node is based on receiving a second indication from one of the second UE, the base station, or the location server, that the second UE meets an accuracy threshold;
obtaining the first measurement, by the first UE, of a first reference signal transmitted by the reference node;
obtaining the second measurement, by the first UE, of a second reference signal transmitted by the other one of the base station or the second UE that is not the reference node, wherein the first measurement and the second measurement are obtained within the predetermined time window; and
sending, by the first UE, information indicative of the first measurement and information indicative of the second measurement.
2. The method of claim 1 , wherein the second UE is configured to communicate with the first UE via a sidelink (SL) interface, and wherein the information indicative of the first measurement comprises information indicative of a Reference Signal Time Difference (RSTD) based on the first measurement of the first reference signal and the second measurement of the second reference signal.
3. The method of claim 2 , wherein the first UE determines the RSTD at least in part by using the base station as the reference node for the RSTD determination.
4. The method of claim 1 , wherein the information indicative of the first measurement comprises information indicative of a Round Trip Time (RTT) based on the first measurement of the first reference signal.
5. The method of claim 4 , wherein obtaining the first measurement comprises determining a first Rx-Tx measurement based on the first reference signal, wherein:
the first UE further receives a second Rx-Tx measurement, taken by the second UE, via a sidelink (SL) interface; and
sending the information indicative of the RTT based on the first measurement of the first reference signal comprises sending:
the first Rx-Tx measurement and the second Rx-Tx measurement, or
the RTT determined from the first Rx-Tx measurement and the second Rx-Tx measurement, or
any combination thereof.
6. The method of claim 1 , wherein the information indicative of the first measurement comprises an indication of an Angle of Departure (AoD) based on the first measurement of the first reference signal.
7. The method of claim 6 , wherein the indication of the AoD based on the first measurement of the first reference signal comprises a Reference Signal Receive Power (RSRP) measurement and beam ID of the first reference signal.
8. The method of claim 1 , wherein the information indicative of the first measurement comprises an indication of an Angle of Arrival (AoA) based on the first measurement of the first reference signal.
9. The method of claim 8 , wherein the indication of the AoA based on the first measurement of the first reference signal comprises an orientation and receiving beam or angle of the first UE.
10. The method of claim 1 , wherein sending the information indicative of the first measurement and the information indicative of the second measurement comprises sending the information to the location server.
11. The method of claim 1 , wherein the predetermined time window comprises a time window defined by:
a number of Orthogonal Frequency Division Multiplexing (OFDM) slots,
a number OFDM subframes,
a number OFDM frames,
a start time and an end time,
a time duration,
a number of measurement gaps (MGs), or
a number of processing windows, or
a combination thereof.
12. The method of claim 1 , further comprising, prior to obtaining the first measurement and the second measurement, receiving information indicative of the predetermined time window by the first UE.
13. A first user equipment (UE) for providing a positioning measurement report for determining a location of the first UE, the first UE comprising:
a transceiver;
a memory; and
one or more processors communicatively coupled with the transceiver and the memory, wherein the one or more processors are configured to:
receive a configuration indicative of a predetermined time window comprising a period of time during which a first measurement and a second measurement are to be obtained;
determine one of:
a) to use a base station as a reference node, wherein determining to use the base station as the reference node is based on receiving a first indication from a location server that a second UE should not be used as the reference node; or
b) to use the second UE as the reference node, wherein determining to use the second UE as the reference node is based on receiving a second indication from one of the second UE, the base station, or the location server, that the second UE meets an accuracy threshold;
obtain the first measurement, using the transceiver, of a first reference signal transmitted by the reference node;
obtain the second measurement, using the transceiver, of a second reference signal transmitted by the other one of the base station or the second UE that is not the reference node, wherein the first measurement and the second measurement are obtained within the predetermined time window; and
send, using the transceiver, information indicative of the first measurement and information indicative of the second measurement.
14. The first UE of claim 13 , wherein the second UE is configured to communicate with the first UE via a sidelink (SL) interface, and wherein the one or more processors are configured to include, in the information indicative of the first measurement, information indicative of a Reference Signal Time Difference (RSTD) based on the first measurement of the first reference signal and the second measurement of the second reference signal.
15. The first UE of claim 14 , wherein the one or more processors are configured to determine the RSTD at least in part by using the base station as the reference node for the RSTD determination.
16. The first UE of claim 14 , wherein the one or more processors are further configured to:
receive an indication that the second UE meets an accuracy threshold; and,
responsive to receiving the indication that the second UE meets the accuracy threshold, use the second UE as the reference node to determine the RSTD.
17. The first UE of claim 13 , wherein the one or more processors are configured to include, in the information indicative of the first measurement, information indicative of a Round Trip Time (RTT) based on the first measurement of the first reference signal.
18. The first UE of claim 17 , wherein to obtain the first measurement, the one or more processors are configured to determine a first Rx-Tx measurement based on the first reference signal, wherein:
the one or more processors are configured to receive a second Rx-Tx measurement, taken by the second UE, via a sidelink (SL) interface; and
the one or more processors are configured to send the information indicative of the RTT based on the first measurement of the first reference signal, wherein the one or more processors are configured to include, in the information indicative of the RTT:
the first Rx-Tx measurement and the second Rx-Tx measurement, or
the RTT determined from the first Rx-Tx measurement and the second Rx-Tx measurement, or
any combination thereof.
19. The first UE of claim 13 , wherein the one or more processors are configured to include, in the information indicative of the first measurement, an indication of an Angle of Departure (AoD) based on the first measurement of the first reference signal.
20. The first UE of claim 19 , wherein the one or more processors are configured to include, in the indication of the AoD based on the first measurement of the first reference signal, a Reference Signal Receive Power (RSRP) measurement and beam ID of the first reference signal.
21. The first UE of claim 13 , wherein the one or more processors are configured to include, in the information indicative of the first measurement, an indication of an Angle of Arrival (AoA) based on the first measurement of the first reference signal.
22. The first UE of claim 21 , wherein the one or more processors are configured to include, in the indication of the AoA based on the first measurement of the first reference signal, an orientation and receiving beam or angle of the first UE.
23. The first UE of claim 13 , wherein, to send the information indicative of the first measurement and the information indicative of the second measurement, the one or more processors are configured to send the information to a location server.
24. The first UE of claim 13 , wherein the predetermined time window comprises a time window defined by:
a number of Orthogonal Frequency Division Multiplexing (OFDM) slots,
a number OFDM subframes,
a number OFDM frames,
a start time and an end time,
a time duration,
a number of measurement gaps (MGs), or
a number of processing windows, or
a combination thereof.
25. The first UE of claim 13 , wherein the one or more processors are further configured to, prior to obtaining the first measurement and the second measurement, receive information indicative of the predetermined time window via the transceiver.
26. An apparatus for providing a positioning measurement report for determining a location of a first user equipment (UE), the apparatus comprising:
means for receiving a configuration indicative of a predetermined time window comprising a period of time during which a first measurement and a second measurement are to be obtained;
means for determining one of:
a) to use a base station as a reference node, wherein determining to use the base station as the reference node is based on receiving a first indication from a location server that a second UE should not be used as the reference node; or
b) to use the second UE as the reference node, wherein determining to use the second UE as the reference node is based on receiving a second indication from one of the second UE, the base station, or the location server, that the second UE meets an accuracy threshold;
means for obtaining the first measurement, at the first UE, of a first reference signal transmitted by the reference node;
means for obtaining the second measurement, at the first UE, of a second reference signal transmitted by the other one of the base station or the second UE that is not the reference node, wherein the first measurement and the second measurement are obtained within the predetermined time window; and
means for sending information indicative of the first measurement and information indicative of the second measurement.
27. The apparatus of claim 26 , wherein the second UE is configured to communicate with the first UE via a sidelink (SL) interface, and wherein the means for sending information indicative of the first measurement comprise means for sending information indicative of a Reference Signal Time Difference (RSTD) based on the first measurement of the first reference signal and the second measurement of the second reference signal.
28. The apparatus of claim 26 , wherein the means for sending information indicative of the first measurement comprise means for sending an indication of a Round Trip Time (RTT) based on the first measurement of the first reference signal.
29. A non-transitory computer-readable medium storing instructions for providing a positioning measurement report for determining a location of a first user equipment (UE), the instructions comprising code for:
receiving a configuration indicative of a predetermined time window comprising a period of time during which a first measurement and a second measurement are to be obtained;
determining one of:
a) to use a base station as a reference node, wherein determining to use the base station as the reference node is based on receiving a first indication from a location server that a second UE should not be used as the reference node; or
b) to use the second UE as the reference node, wherein determining to use the second UE as the reference node is based on receiving a second indication from one of the second UE, the base station, or the location server, that the second UE meets an accuracy threshold;
obtaining the first measurement, by the first UE, of a first reference signal transmitted by the reference node;
obtaining the second measurement, by the first UE, of a second reference signal transmitted by the other one of the base station or the second UE that is not the reference node, wherein the first measurement and the second measurement are obtained within the predetermined time window; and
sending, by the first UE, information indicative of the first measurement and information indicative of the second measurement.