Efficient positioning enhancement for dynamic spectrum sharing
Techniques are provided for transmitting Positioning Reference Signals (PRSs) in cells supporting two different Radio Access Technologies (RATs), where the two RATs (e.g. 4G LTE and 5G NR) employ dynamic spectrum sharing. To avoid interference between the PRSs and between the two RATs, the PRSs may be time aligned to the same set of PRS positioning occasions, and may be assigned orthogonal characteristics such as different muting patterns, orthogonal code sequences, different frequency shifts or different frequency hopping. UEs supporting both RATs may be enabled to measure PRSs for both RATs. UEs supporting only one RAT (e.g. 4G LTE) may be enabled to measure PRSs for just this RAT. A location server such as an LMF, E-SMLC or SLP may provide assistance data to UEs, and request measurements from UEs, for PRSs in one or both RATs.
1. A method, at a network server, to support positioning of a mobile device with dynamic spectrum sharing, comprising:
receiving a first set of location measurements obtained by the mobile device for first positioning reference signals (PRSs) transmitted in a first plurality of cells, the first plurality of cells using a first radio access technology (RAT);
receiving a second set of location measurements obtained by the mobile device for second PRSs transmitted in a second plurality of cells, the second plurality of cells using a second RAT, wherein the first RAT and the second RAT are different radio access technologies operating on the same radio frequency band, with the first set of location measurements corresponding to first PRS positioning occasions of the first PRSs scheduled for occurrence at the same time with second PRS positioning occasions of the second PRSs corresponding to the second set of location measurements; and
determining a location of the mobile device based at least in part on the first set of location measurements and the second set of location measurements.
2. The method of claim 1 , wherein the first RAT is 4G Long Term Evolution (LTE) and the second RAT is 5G New Radio (NR).
3. The method of claim 1 , wherein the network server comprises a Location Management Function (LMF), an Enhanced Serving Mobile Location Center (E-SMLC), or a Secure User Plane Location (SUPL) Location Platform (SLP).
4. The method of claim 1 , wherein the first set of location measurements and the second set of location measurements each comprise measurements comprising at least one of a Time of Arrival (TOA), a Received Signal Strength Indication (RSSI), a Round Trip signal propagation Time (RTT), a Reference Signal Time Difference (RSTD), a Reference Signal Received Power (RSRP), a Receive Time-Transmission Time difference (Rx-Tx), a Reference Signal Received Quality (RSRQ), or some combination of these.
5. The method of claim 1 , wherein each PRS in the first PRSs and the second PRSs comprises a sequence of PRS positioning occasions, wherein the sequence of PRS positioning occasions for each PRS occur at the same times as the sequence of PRS positioning occasions for each of other PRSs in the first PRSs and the second PRSs.
6. The method of claim 1 , wherein each PRS in the first PRSs and the second PRSs includes orthogonal characteristics, wherein the orthogonal characteristics reduce interference between the each PRS and other PRSs in the first PRSs and the second PRSs.
7. The method of claim 6 , wherein the orthogonal characteristics include at least one of a distinct frequency shift, an orthogonal PRS code sequence, a distinct frequency hopping sequence, a distinct muting pattern, or some combination of these.
8. The method of claim 6 , wherein the orthogonal characteristics include a distinct muting pattern, wherein the each PRS is transmitted during PRS positioning occasions in which PRS is not transmitted for some other PRSs in the first PRSs and the second PRSs, wherein the each PRS is not transmitted during PRS positioning occasions in which PRS is transmitted for at least some of the some other PRSs in the first PRSs and the second PRSs.
9. The method of claim 8 , further comprising sending assistance data to the mobile device, the assistance data including a configuration of each PRS in the first PRSs and the second PRSs, the configuration including an indication of the PRS positioning occasions and the orthogonal characteristics for the each PRS, wherein the first set of location measurements and the second set of location measurements are obtained by the mobile device based in part on the configuration of each PRS in the first PRSs and the second PRSs.
10. The method of claim 1 , wherein the radio frequency band includes frequencies in a range of 600 MHz to 700 MHz or in a range of 2.5 GHz to 3.5 GHz.
11. An apparatus, comprising:
a memory;
a transceiver;
a processor communicatively coupled to the memory and the transceiver and configured to:
receive a first set of location measurements obtained by a mobile device for first positioning reference signals (PRSs) transmitted in a first plurality of cells, the first plurality of cells using a first radio access technology (RAT);
receive a second set of location measurements obtained by the mobile device for second PRSs transmitted in a second plurality of cells, the second plurality of cells using a second RAT, wherein the first RAT and the second RAT are different radio access technologies operating on the same radio frequency band, with the first set of location measurements corresponding to first PRS positioning occasions of the first PRSs scheduled for occurrence at the same time with second PRS positioning occasions of the second PRSs corresponding to the second set of location measurements; and
determine a location of the mobile device based at least in part on the first set of location measurements and the second set of location measurements.
12. The apparatus of claim 11 wherein the first RAT is 4G Long Term Evolution (LTE) and the second RAT is 5G New Radio (NR).
13. The apparatus of claim 11 , wherein the apparatus comprises a Location Management Function (LMF), an Enhanced Serving Mobile Location Center (E-SMLC), or a Secure User Plane Location (SUPL) Location Platform (SLP).
14. The apparatus of claim 11 , wherein the first set of location measurements and the second set of location measurements each comprise measurements comprising at least one of a Time of Arrival (TOA), a Received Signal Strength Indication (RSSI), a Round Trip signal propagation Time (RTT), a Reference Signal Time Difference (RSTD), a Reference Signal Received Power (RSRP), a Receive Time-Transmission Time difference (Rx-Tx), a Reference Signal Received Quality (RSRQ), or some combination of these.
15. The apparatus of claim 11 , wherein each PRS in the first PRSs and the second PRSs comprises a sequence of PRS positioning occasions, wherein the sequence of PRS positioning occasions for each PRS occur at the same times as the sequence of PRS positioning occasions for each of other PRSs in the first PRSs and the second PRSs.
16. The apparatus of claim 11 , wherein each PRS in the first PRSs and the second PRSs includes orthogonal characteristics, wherein the orthogonal characteristics reduce interference between the each PRS and other PRSs in the first PRSs and the second PRSs.
17. The apparatus of claim 16 , wherein the orthogonal characteristics include at least one of a distinct frequency shift, an orthogonal PRS code sequence, a distinct frequency hopping sequence, a distinct muting pattern, or some combination of these.
18. The apparatus of claim 16 , wherein the orthogonal characteristics include a distinct muting pattern, wherein the each PRS is transmitted during PRS positioning occasions in which PRS is not transmitted for some other PRSs in the first PRSs and the second PRSs, wherein the each PRS is not transmitted during PRS positioning occasions in which PRS is transmitted for at least some of the some other PRSs in the first PRSs and the second PRSs.
19. The apparatus of claim 18 , wherein the processor is further configured to send assistance data to the mobile device, the assistance data including a configuration of each PRS in the first PRSs and the second PRSs, the configuration including an indication of the sequence of PRS positioning occasions and the orthogonal characteristics for the each PRS, wherein the first set of location measurements and the second set of location measurements are obtained by the mobile device based in part on the configuration of each PRS in the first PRSs and the second PRSs.
20. The apparatus of claim 11 , wherein the radio frequency band includes frequencies in a range of 600 MHz to 700 MHz or in a range of 2.5 GHz to 3.5 GHZ.
21. An apparatus, comprising:
means for receiving a first set of location measurements obtained by a mobile device for first positioning reference signals (PRSs) transmitted in a first plurality of cells, the first plurality of cells using a first radio access technology (RAT);
means for receiving a second set of location measurements obtained by the mobile device for second PRSs transmitted in a second plurality of cells, the second plurality of cells using a second RAT, wherein the first RAT and the second RAT are different radio access technologies operating on the same radio frequency band, with the first set of location measurements corresponding to first PRS positioning occasions of the first PRSs scheduled for occurrence at the same time with second PRS positioning occasions of the second PRSs corresponding to the second set of location measurements; and
means for determining a location of the mobile device based at least in part on the first set of location measurements and the second set of location measurements.
22. The apparatus of claim 21 , wherein the first RAT is 4G Long Term Evolution (LTE) and the second RAT is 5G New Radio (NR).
23. The apparatus of claim 21 , wherein the apparatus comprises a Location Management Function (LMF), an Enhanced Serving Mobile Location Center (E-SMLC), or a Secure User Plane Location (SUPL) Location Platform (SLP).
24. The apparatus of claim 21 , wherein the first set of location measurements and the second set of location measurements each comprise measurements comprising at least one of a Time of Arrival (TOA), a Received Signal Strength Indication (RSSI), a Round Trip signal propagation Time (RTT), a Reference Signal Time Difference (RSTD), a Reference Signal Received Power (RSRP), a Receive Time-Transmission Time difference (Rx-Tx), a Reference Signal Received Quality (RSRQ), or some combination of these.
25. The apparatus of claim 21 , wherein each PRS in the first PRSs and the second PRSs comprises a sequence of PRS positioning occasions, wherein the sequence of PRS positioning occasions for each PRS occur at the same times as the sequence of PRS positioning occasions for each of other PRSs in the first PRSs and the second PRSs.
26. The apparatus of claim 21 , wherein each PRS in the first PRSs and the second PRSs includes orthogonal characteristics, wherein the orthogonal characteristics reduce interference between the each PRS and other PRSs in the first PRSs and the second PRSs.
27. The apparatus of claim 26 , wherein the orthogonal characteristics include at least one of a distinct frequency shift, an orthogonal PRS code sequence, a distinct frequency hopping sequence, a distinct muting pattern, or some combination of these.
28. The apparatus of claim 26 , wherein the orthogonal characteristics include a distinct muting pattern, wherein the each PRS is transmitted during PRS positioning occasions in which PRS is not transmitted for some other PRSs in the first PRSs and the second PRSs, wherein the each PRS is not transmitted during PRS positioning occasions in which PRS is transmitted for at least some of the some other PRSs in the first PRSs and the second PRSs.
29. The apparatus of claim 28 , further comprising means for sending assistance data to the mobile device, the assistance data including a configuration of each PRS in the first PRSs and the second PRSs, the configuration including an indication of the sequence of PRS positioning occasions and the orthogonal characteristics for the each PRS, wherein the first set of location measurements and the second set of location measurements are obtained by the mobile device based in part on the configuration of each PRS in the first PRSs and the second PRSs.
30. The apparatus of claim 21 , wherein the radio frequency band includes frequencies in a range of 600 MHz to 700 MHz or in a range of 2.5 GHz to 3.5 GHz.
31. A non-transitory processor-readable storage medium comprising processor-readable instructions configured to cause one or more processors to support positioning of a mobile device with dynamic spectrum sharing, comprising:
code for receiving a first set of location measurements obtained by the mobile device for first positioning reference signals (PRSs) transmitted in a first plurality of cells, the first plurality of cells using a first radio access technology (RAT);
code for receiving a second set of location measurements obtained by the mobile device for second PRSs transmitted in a second plurality of cells, the second plurality of cells using a second RAT, wherein the first RAT and the second RAT are different radio access technologies operating on the same radio frequency band, with the first set of location measurements corresponding to first PRS positioning occasions of the first PRSs scheduled for occurrence at the same time with second PRS positioning occasions of the second PRSs corresponding to the second set of location measurements; and
code for determining a location of the mobile device based at least in part on the first set of location measurements and the second set of location measurements.
32. The non-transitory processor-readable storage medium of claim 31 , further comprising code for sending assistance data to the mobile device, the assistance data including a configuration of each PRS in the first PRSs and the second PRSs, the configuration including an indication of a sequence of PRS positioning occasions and orthogonal characteristics for the each PRS, wherein the first set of location measurements and the second set of location measurements are obtained by the mobile device based in part on the configuration of each PRS in the first PRSs and the second PRSs.