Premium device-aided low-tier device group delay calibration for NR positioning
Techniques are provided for calibrating group delay for a low-tier UE by leveraging the relatively high accuracy of RTT positioning for a premium UE. This can enable online/in-field group delay calibration of low-tier UEs, allowing for low-tier UEs to be calibrated when needed. Depending on desired functionality, techniques for calibration may include the use of RTT measurements with a base station, or an RTT measurement between the low-tier UE and the premium UE.
1. A method of determining a group delay of a first mobile device, the method comprising:
obtaining a first Round-Trip-Time (RTT) measurement between the first mobile device and a base station;
identifying a second mobile device within a threshold distance of the first mobile device, wherein the second mobile device has a higher bandwidth than the first mobile device;
obtaining a second RTT measurement between the second mobile device and the base station; and
determining a group delay of the first mobile device based on a difference between the first RTT measurement and the second RTT measurement.
2. The method of claim 1 , wherein the first mobile device comprises a low-tier User Equipment (UE) having a bandwidth of less than 100 MHz, and the second mobile device comprises a premium UE having a bandwidth of 100 MHz or more.
3. The method of claim 1 , wherein the first mobile device determines the group delay.
4. The method of claim 3 , wherein the first mobile device further sends information indicative of the determined group delay to the base station.
5. The method of claim 3 , wherein the first mobile device further sends the determined group delay to the second mobile device, and the second mobile device sends information indicative of the determined group delay to the base station.
6. The method of claim 1 , wherein the second mobile device determines the group delay.
7. The method of claim 6 , wherein the second mobile device further sends information indicative of the determined group delay to the base station.
8. The method of claim 1 , wherein the base station determines the group delay.
9. The method of claim 1 , wherein identifying the second mobile device comprises determining that a difference between a first AoA measurement by the base station of the first mobile device and a second AoA measurement by the base station of the second mobile device is within a threshold value.
10. The method of claim 1 , wherein identifying that the second mobile device comprises performing a scan of available devices by the first mobile device.
11. The method of claim 10 , wherein identifying the second mobile device further comprises receiving a user selection of the second mobile device from a list of a plurality of mobile devices detected from the scan.
12. A device comprising: a transceiver; a memory; and one or more processing units communicatively coupled with the transceiver and the memory and configured to: obtain a first Round-Trip-Time (RTT) measurement between a first mobile device and a base station; identify a second mobile device within a threshold distance of the first mobile device, wherein the second mobile device has a higher bandwidth than the first mobile device; obtain a second RTT measurement between the second mobile device and the base station; and determine a group delay of the first mobile device based on a difference between the first RTT measurement and the second RTT measurement.
13. The device of claim 12 , wherein the device comprises the first mobile device.
14. The device of claim 13 , further comprising a low-tier User Equipment (UE) having a bandwidth of less than 100 MHz.
15. The device of claim 13 , wherein the one or more processing units are further configured to cause the transceiver to send information indicative of the determined group delay to the base station.
16. The device of claim 13 , wherein the one or more processing units are further configured to cause the transceiver to send the determined group delay to the second mobile device.
17. The device of claim 12 , wherein the device comprises the second mobile device.
18. The device of claim 17 , wherein the second mobile device further sends information indicative of the determined group delay to the base station.
19. The device of claim 17 , further comprising a premium UE having a bandwidth of 100 MHz or more.
20. The device of claim 12 , wherein the device comprises the base station.
21. The device of claim 12 , wherein, to identify the second mobile device, the one or more processing units are configured to determine that a difference between a first AoA measurement by the base station of the first mobile device and a second AoA measurement by the base station of the second mobile device is within a threshold value.
22. The device of claim 12 , wherein, to identify the second mobile device, the one or more processing units are configured to perform a scan of available devices by the first mobile device.
23. The device of claim 22 , wherein, to identify the second mobile device, the one or more processing units are configured to receive a user selection of the second mobile device from a list of a plurality of mobile devices detected from the scan.