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:
receiving a signal, wherein the WTRU is in any of idle mode and inactive mode;
determining at least one positioning measurement parameter based on the received signal; and
transmitting a positioning measurement report in any of idle mode and inactive mode in a random-access channel (RACH) based on the at least one positioning measurement parameter, wherein the positioning measurement report comprises a RACH preamble associated with the WTRU.
2 . The method of claim 1 , wherein the received signal comprises any of a primary synchronization signal, PSS, a secondary synchronization signal (SSS), a demodulation reference signal (DMRS), a cell-specific reference signal (CRS), and a positioning reference signal (PRS).
3 . The method of claim 1 , wherein the at least one positioning measurement parameter indicates any of a round trip time (RTT), an angle of arrival (AOA), and a reference signal time difference (RSTD).
4 . The method of claim 1 , comprising multiplexing the positioning measurement report in the RACH preamble.
5 . The method of claim 1 , comprising transmitting RACH information indicating an intent to transmit the positioning measurement report.
6 . The method of claim 5 , comprising receiving a random-access response (RAR) indicating an uplink reporting resource, wherein the positioning measurement report is transmitted according to the uplink reporting resource.
7 . The method of claim 6 , wherein the positioning measurement report is transmitted in a physical uplink shared channel (PUSCH).
8 . The method of claim 1 , wherein the RACH preamble is further associated with a positioning measurement identifier.
9 . The method of claim 8 , wherein a seed of the RACH preamble is a function of any of a WTRU identifier, the positioning measurement identifier and the at least one positioning measurement parameter.
10 . The method of claim 1 , wherein the RACH preamble is further associated with the at least one positioning measurement parameter.
11 . A wireless transmit/receive unit, WTRU, comprising circuitry, including any of a transmitter, receiver, processor and memory, configured for:
receiving a signal, wherein the WTRU is in any of idle mode and inactive mode;
determining at least one positioning measurement parameter based on the received signal; and
transmitting a positioning measurement report in in any of idle mode and inactive mode in a random-access channel (RACH) based on the at least one positioning measurement parameter, wherein the positioning measurement report comprises a RACH preamble associated with the WTRU.
12 . The WTRU of claim 11 , wherein the received signal comprises any of a primary synchronization signal, PSS, a secondary synchronization signal (SSS), a demodulation reference signal (DMRS), a cell-specific reference signal (CRS), and a positioning reference signal (PRS).
13 . The WTRU of claim 11 , wherein the at least one positioning measurement parameter indicates any of a round trip time (RTT), an angle of arrival (AOA), and a reference signal time difference (RSTD).
14 . The WTRU of claim 11 , configured for multiplexing the positioning measurement report in the RACH preamble.
15 . The WTRU of claim 11 , configured for transmitting RACH information indicating an intent to transmit the positioning measurement report.
16 . The WTRU of claim 15 , configured for receiving a random-access response (RAR) indicating an uplink reporting resource, wherein the circuitry being configured for transmitting the positioning measurement report comprises the circuitry being configured for transmitting the positioning measurement report according to the uplink reporting resource.
17 . The WTRU of claim 16 , wherein being configured for transmitting the positioning measurement report comprises being configured for transmitting the positioning measurement report in a physical uplink shared channel (PUSCH).
18 . The WTRU of claim 11 , wherein the RACH preamble is further associated with a positioning measurement identifier.
19 . The WTRU of claim 18 , wherein a seed of the RACH preamble is a function of any of a WTRU identifier, the positioning measurement identifier and the at least one positioning measurement parameter.
20 . The WTRU of claim 11 , wherein the RACH preamble is further associated with the at least one positioning measurement parameter.