Methods, apparatuses and systems directed to idle/inactive mode positioning in NR
Methods, apparatuses, systems, etc., directed to performing positioning of a wireless transmit/receive unit (WTRU) while it is in idle mode and/or inactive mode (collectively “idle/inactive mode”) in NR are disclosed herein. Performing positioning, including positioning measurement and/or reporting, in idle/inactive mode may allow for increased positioning accuracy and/or decreased latency of location determination. In various embodiments, a WTRU in idle/inactive mode may transmit a positioning measurement report in various ways, including (i) in a Random-Access Channel (RACH) preamble; (ii) appended to a RACH preamble; and/or (iii) in a Physical Uplink Shared Channel. In various embodiments, a WTRU in idle/inactive mode may transmit uplink-based positioning related reference signals. In various embodiments, a WTRU in an idle/inactive mode may transmit, over a dedicated physical channel, (e.g., downlink) positioning measurement reports and/or reference signals (RSs) for uplink positioning measurements.
1. A method implemented in a wireless transmit/receive unit (WTRU), the method comprising:
transmitting a positioning request by any of transmitting a positioning specific preamble and transmitting a preamble in a positioning specific resource, wherein the WTRU is in any of idle mode and inactive mode;
receiving a positioning random access response (positioning RAR) indicating allocated resources for transmitting a repetition of an uplink positioning reference signal (UL PRS); and
transmitting the UL PRS at least two times in the allocated resources.
2. The method according to claim 1 , further comprising receiving configuration information indicating any of a set of positioning specific preambles and a set of positioning specific resources.
3. The method according to claim 1 , further comprising receiving configuration information indicating any of a periodicity for transmitting positioning requests and periodic start and stop times for transmitting the positioning requests.
4. The method according to claim 1 , wherein the positioning request is transmitted upon a determination that an amount of time has elapsed.
5. The method according to claim 1 , wherein the positioning request is transmitted after determining a positioning change of the WTRU by detecting a change in received downlink reference signals.
6. The method according to claim 1 , wherein the positioning RAR includes information indicating any of a timing advance, a temporary WTRU identifier, a bandwidth part, a set of resources to transmit a WTRU identifier, uplink configuration information to be used when retransmitting the UL PRS, and a number of repeated transmissions of UL PRS.
7. The method according to claim 6 , wherein the UL PRS is based on the WTRU identifier.
8. The method according to claim 6 , wherein the temporary WTRU identifier is used to scramble the WTRU identifier.
9. The method according to claim 1 , wherein the positioning request is transmitted by transmitting the positioning specific preamble.
10. The method according to claim 1 , wherein the positioning request is transmitted by transmitting the preamble in the positioning specific resource.
11. An apparatus comprising circuitry, including any of a transmitter, receiver, processor and memory, configured to:
transmit a positioning request by any of transmitting a positioning specific preamble and transmitting a preamble in a positioning specific resource, wherein the apparatus is in any of idle mode and inactive mode;
receive a positioning random access response (positioning RAR) indicating allocated resources for transmitting a repetition of an uplink positioning reference signal (UL PRS); and
transmit the UL PRS at least two times in the allocated resources.
12. The apparatus according to claim 11 , further configured to receive configuration information indicating any of a set of positioning specific preambles and a set of positioning specific resources.
13. The apparatus according to claim 11 , further configured to receive configuration information indicating any of a periodicity for transmitting positioning requests and periodic start and stop times for transmitting the positioning requests.
14. The apparatus according to claim 11 , further configured to transmit the positioning request upon a determination that an amount of time has elapsed.
15. The apparatus according to claim 11 , further configured to transmit the positioning request after determining a positioning change of the apparatus by detecting a change in received downlink reference signals.
16. The apparatus according to claim 11 , wherein the positioning RAR includes information indicating any of a timing advance, a temporary WTRU identifier, a bandwidth part, a set of resources to transmit a WTRU identifier, uplink configuration information to be used when retransmitting the UL PRS, and a number of repeated transmissions of UL PRS.
17. The apparatus according to claim 16 , wherein the UL PRS is based on the WTRU identifier.
18. The apparatus according to claim 16 , wherein the temporary WTRU identifier is used to scramble the WTRU identifier.
19. The apparatus according to claim 11 , wherein the positioning request is transmitted by transmitting the positioning specific preamble.
20. The apparatus according to claim 11 , wherein the positioning request is transmitted by transmitting the preamble in the positioning specific resource.